diff --git a/dev/demux.html b/dev/demux.html
index c03e1a8..6dbe5d5 100644
--- a/dev/demux.html
+++ b/dev/demux.html
@@ -13,6 +13,62 @@
 			source
 		});
 
+		const videoTrack = await input.getPrimaryVideoTrack();
+		const audioTrack = await input.getPrimaryAudioTrack();;
+		console.log(videoTrack.computeDuration());
+		console.log(await audioTrack.computeDuration());
+
+		/*
+		const audioTrack = await input.getPrimaryAudioTrack();
+		const drain = new Metamuxer.AudioBufferDrain(audioTrack);
+
+		const context = new AudioContext();
+		const startTime = context.currentTime;
+
+		for await (const { buffer, timestamp } of drain.buffers()) {
+			const node = context.createBufferSource();
+			node.buffer = buffer;
+			node.connect(context.destination);
+			const start = startTime + timestamp
+			node.start(start);
+
+			if (start > context.currentTime + 5) {
+				await new Promise(resolve => {
+					const id = setInterval(() => {
+						if (start < context.currentTime + 5) {
+							clearInterval(id);
+							resolve();
+						}
+					}, 100);
+				});
+			}
+		}
+		*/
+
+		/*
+		const drain = new Metamuxer.AudioDataDrain(audioTrack);
+
+		console.time()
+		for await (const data of drain.data()) {
+			data.close();
+		}
+		console.timeEnd()
+		*/
+
+
+		/*
+		const drain = new Metamuxer.EncodedAudioChunkDrain(audioTrack);
+
+		for await (const chunk of drain.chunks()) {
+			console.log(chunk);
+
+			if (chunk.timestamp > 1e6) {
+				break;
+			}
+		}
+		*/
+
+		/*
 		const videoTrack = await input.getPrimaryVideoTrack();
 		const drain = new Metamuxer.VideoFrameDrain(videoTrack);
 		const width = await videoTrack.getWidth();
@@ -30,6 +86,7 @@
 			context.drawImage(frame, 0, 0, width, height);
 			frame.close();
 		}
+		*/
 
 		/*
 		const drain = new Metamuxer.EncodedVideoChunkDrain(videoTrack);
diff --git a/dist/metamuxer.js b/dist/metamuxer.js
index b9a8069..9f0e66f 100644
--- a/dist/metamuxer.js
+++ b/dist/metamuxer.js
@@ -25,11 +25,14 @@ var Metamuxer = (() => {
     AUDIO_CODECS: () => AUDIO_CODECS,
     ArrayBufferSource: () => ArrayBufferSource,
     ArrayBufferTarget: () => ArrayBufferTarget,
+    AudioBufferDrain: () => AudioBufferDrain,
     AudioBufferSource: () => AudioBufferSource,
+    AudioDataDrain: () => AudioDataDrain,
     AudioDataSource: () => AudioDataSource,
     AudioSource: () => AudioSource,
     BlobSource: () => BlobSource,
     CanvasSource: () => CanvasSource,
+    EncodedAudioChunkDrain: () => EncodedAudioChunkDrain,
     EncodedAudioChunkSource: () => EncodedAudioChunkSource,
     EncodedVideoChunkDrain: () => EncodedVideoChunkDrain,
     EncodedVideoChunkSource: () => EncodedVideoChunkSource,
@@ -1811,11 +1814,8 @@ var Metamuxer = (() => {
   };
   var extractAudioCodecString = (codec, description) => {
     if (codec === "aac") {
-      if (!description || description.byteLength < 2) {
-        throw new TypeError("AAC description must be at least 2 bytes long.");
-      }
-      const mpeg4AudioObjectType = description[0] >> 3;
-      return `mp4a.40.${mpeg4AudioObjectType}`;
+      const audioSpecificConfig = parseAacAudioSpecificConfig(description);
+      return `mp4a.40.${audioSpecificConfig.objectType}`;
     } else if (codec === "opus") {
       return "opus";
     } else if (codec === "vorbis") {
@@ -1823,6 +1823,66 @@ var Metamuxer = (() => {
     }
     throw new TypeError(`Unhandled codec '${codec}'.`);
   };
+  var parseAacAudioSpecificConfig = (bytes2) => {
+    if (!bytes2 || bytes2.byteLength < 2) {
+      throw new TypeError("AAC description must be at least 2 bytes long.");
+    }
+    let bitOffset = 0;
+    let objectType = readBits(bytes2, bitOffset, bitOffset + 5);
+    bitOffset += 5;
+    if (objectType === 31) {
+      objectType = 32 + readBits(bytes2, bitOffset, bitOffset + 6);
+      bitOffset += 6;
+    }
+    const frequencyIndex = readBits(bytes2, bitOffset, bitOffset + 4);
+    bitOffset += 4;
+    let sampleRate = null;
+    if (frequencyIndex === 15) {
+      sampleRate = readBits(bytes2, bitOffset, bitOffset + 24);
+      bitOffset += 24;
+    } else {
+      const freqTable = [
+        96e3,
+        88200,
+        64e3,
+        48e3,
+        44100,
+        32e3,
+        24e3,
+        22050,
+        16e3,
+        12e3,
+        11025,
+        8e3,
+        7350
+      ];
+      if (frequencyIndex < freqTable.length) {
+        sampleRate = freqTable[frequencyIndex];
+      }
+    }
+    const channelConfiguration = readBits(bytes2, bitOffset, bitOffset + 4);
+    bitOffset += 4;
+    let numberOfChannels = null;
+    if (channelConfiguration >= 1 && channelConfiguration <= 7) {
+      const channelMap = {
+        1: 1,
+        2: 2,
+        3: 3,
+        4: 4,
+        5: 5,
+        6: 6,
+        7: 8
+      };
+      numberOfChannels = channelMap[channelConfiguration];
+    }
+    return {
+      objectType,
+      frequencyIndex,
+      sampleRate,
+      channelConfiguration,
+      numberOfChannels
+    };
+  };
   var getVideoEncoderConfigExtension = (codec) => {
     if (codec === "avc") {
       return {
@@ -4087,8 +4147,8 @@ ${cue.notes ?? ""}`;
     isAudioTrack() {
       return this instanceof InputAudioTrack;
     }
-    getDuration() {
-      return this._backing.getDuration();
+    computeDuration() {
+      return this._backing.computeDuration();
     }
   };
   var InputVideoTrack = class extends InputTrack {
@@ -4366,12 +4426,10 @@ ${cue.notes ?? ""}`;
       this.isobmffReader = new IsobmffReader(input._mainReader);
       this.chunkReader = new IsobmffReader(new Reader(input._source, 64 * 2 ** 20));
     }
-    async getDuration() {
-      await this.readMetadata();
-      if (this.movieDurationInTimescale === -1) {
-        throw new Error("Could not read movie duration.");
-      }
-      return this.movieDurationInTimescale / this.movieTimescale;
+    async computeDuration() {
+      const tracks = await this.getTracks();
+      const trackDurations = await Promise.all(tracks.map((x) => x.computeDuration()));
+      return Math.max(0, ...trackDurations);
     }
     async getTracks() {
       await this.readMetadata();
@@ -4589,6 +4647,15 @@ ${cue.notes ?? ""}`;
                 const audioTrack = track;
                 track.inputTrack = new InputAudioTrack(new IsobmffAudioTrackBacking(audioTrack));
                 this.tracks.push(track);
+                if (track.info.codec === "aac") {
+                  const audioSpecificConfig = parseAacAudioSpecificConfig(track.info.codecDescription);
+                  if (audioSpecificConfig.numberOfChannels !== null) {
+                    track.info.numberOfChannels = audioSpecificConfig.numberOfChannels;
+                  }
+                  if (audioSpecificConfig.sampleRate !== null) {
+                    track.info.sampleRate = audioSpecificConfig.sampleRate;
+                  }
+                }
               }
             }
             this.currentTrack = null;
@@ -5295,38 +5362,12 @@ ${cue.notes ?? ""}`;
     getCodec() {
       throw new Error("Not implemented on base class.");
     }
-    async getDuration() {
-      return this.internalTrack.durationInTimescale / this.internalTrack.timescale;
+    async computeDuration() {
+      const lastChunk = await this.getChunk(Infinity, { metadataOnly: true });
+      const timestamp = lastChunk?.timestamp;
+      return timestamp ? timestamp / 1e6 : 0;
     }
-  };
-  var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
-    internalTrack;
-    constructor(internalTrack) {
-      super(internalTrack);
-      this.internalTrack = internalTrack;
-    }
-    async getCodec() {
-      return this.internalTrack.info.codec;
-    }
-    async getWidth() {
-      return this.internalTrack.info.width;
-    }
-    async getHeight() {
-      return this.internalTrack.info.height;
-    }
-    async getRotation() {
-      return this.internalTrack.rotation;
-    }
-    async getDecoderConfig() {
-      return {
-        codec: extractVideoCodecString(this.internalTrack.info.codec, this.internalTrack.info.codecDescription),
-        codedWidth: this.internalTrack.info.width,
-        codedHeight: this.internalTrack.info.height,
-        description: this.internalTrack.info.codecDescription ?? void 0,
-        colorSpace: this.internalTrack.info.colorSpace ?? void 0
-      };
-    }
-    async getFirstChunk() {
+    async getFirstChunk(options) {
       if (this.internalTrack.demuxer.isFragmented) {
         return this.performFragmentedLookup(
           () => {
@@ -5338,26 +5379,28 @@ ${cue.notes ?? ""}`;
             };
           },
           0,
-          Infinity
+          Infinity,
+          options
         );
       }
-      return this.fetchChunkForSampleIndex(0);
+      return this.fetchChunkForSampleIndex(0, options);
     }
-    async getChunk(timestamp) {
+    async getChunk(timestamp, options) {
       const timestampInTimescale = timestamp * this.internalTrack.timescale;
       if (this.internalTrack.demuxer.isFragmented) {
         return this.performFragmentedLookup(
           () => this.findSampleInFragmentsForTimestamp(timestampInTimescale),
           timestampInTimescale,
-          timestampInTimescale
+          timestampInTimescale,
+          options
         );
       } else {
         const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
         const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
-        return this.fetchChunkForSampleIndex(sampleIndex);
+        return this.fetchChunkForSampleIndex(sampleIndex, options);
       }
     }
-    async getNextChunk(chunk) {
+    async getNextChunk(chunk, options) {
       if (this.internalTrack.demuxer.isFragmented) {
         const locationInFragment = this.chunkToFragmentLocation.get(chunk);
         if (locationInFragment === void 0) {
@@ -5406,30 +5449,32 @@ ${cue.notes ?? ""}`;
             }
           },
           sample.presentationTimestamp,
-          Infinity
+          Infinity,
+          options
         );
       }
       const sampleIndex = this.chunkToSampleIndex.get(chunk);
       if (sampleIndex === void 0) {
         throw new Error("Chunk was not created from this track.");
       }
-      return this.fetchChunkForSampleIndex(sampleIndex + 1);
+      return this.fetchChunkForSampleIndex(sampleIndex + 1, options);
     }
-    async getKeyChunk(timestamp) {
+    async getKeyChunk(timestamp, options) {
       const timestampInTimescale = timestamp * this.internalTrack.timescale;
       if (this.internalTrack.demuxer.isFragmented) {
         return this.performFragmentedLookup(
           () => this.findKeySampleInFragmentsForTimestamp(timestampInTimescale),
           timestampInTimescale,
-          timestampInTimescale
+          timestampInTimescale,
+          options
         );
       }
       const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
       const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
       const keyFrameSampleIndex = sampleIndex === -1 ? -1 : getRelevantKeyframeIndexForSample(sampleTable, sampleIndex);
-      return this.fetchChunkForSampleIndex(keyFrameSampleIndex);
+      return this.fetchChunkForSampleIndex(keyFrameSampleIndex, options);
     }
-    async getNextKeyChunk(chunk) {
+    async getNextKeyChunk(chunk, options) {
       if (this.internalTrack.demuxer.isFragmented) {
         const locationInFragment = this.chunkToFragmentLocation.get(chunk);
         if (locationInFragment === void 0) {
@@ -5485,7 +5530,8 @@ ${cue.notes ?? ""}`;
             }
           },
           sample.presentationTimestamp,
-          Infinity
+          Infinity,
+          options
         );
       }
       const sampleIndex = this.chunkToSampleIndex.get(chunk);
@@ -5494,9 +5540,9 @@ ${cue.notes ?? ""}`;
       }
       const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
       const nextKeyFrameSampleIndex = getNextKeyframeIndexForSample(sampleTable, sampleIndex);
-      return this.fetchChunkForSampleIndex(nextKeyFrameSampleIndex);
+      return this.fetchChunkForSampleIndex(nextKeyFrameSampleIndex, options);
     }
-    async fetchChunkForSampleIndex(sampleIndex) {
+    async fetchChunkForSampleIndex(sampleIndex, options) {
       if (sampleIndex === -1) {
         return null;
       }
@@ -5509,25 +5555,27 @@ ${cue.notes ?? ""}`;
       if (!sampleInfo) {
         return null;
       }
-      await this.internalTrack.demuxer.chunkReader.reader.loadRange(
-        sampleInfo.chunkOffset,
-        sampleInfo.chunkOffset + sampleInfo.chunkSize
-      );
-      const data = this.internalTrack.demuxer.chunkReader.readRange(
-        sampleInfo.sampleOffset,
-        sampleInfo.sampleOffset + sampleInfo.sampleSize
-      );
-      const chunk = new EncodedVideoChunk({
-        data,
-        timestamp: 1e6 * sampleInfo.presentationTimestamp / this.internalTrack.timescale,
-        duration: 1e6 * sampleInfo.duration / this.internalTrack.timescale,
-        type: sampleInfo.isKeyFrame ? "key" : "delta"
-      });
+      let data;
+      if (options.metadataOnly) {
+        data = new Uint8Array(0);
+      } else {
+        await this.internalTrack.demuxer.chunkReader.reader.loadRange(
+          sampleInfo.chunkOffset,
+          sampleInfo.chunkOffset + sampleInfo.chunkSize
+        );
+        data = this.internalTrack.demuxer.chunkReader.readRange(
+          sampleInfo.sampleOffset,
+          sampleInfo.sampleOffset + sampleInfo.sampleSize
+        );
+      }
+      const timestamp = 1e6 * sampleInfo.presentationTimestamp / this.internalTrack.timescale;
+      const duration = 1e6 * sampleInfo.duration / this.internalTrack.timescale;
+      const chunk = this.createChunk(data, timestamp, duration, sampleInfo.isKeyFrame);
       this.chunkToSampleIndex.set(chunk, sampleIndex);
       this.sampleIndexToChunk.set(sampleIndex, new WeakRef(chunk));
       return chunk;
     }
-    async fetchChunkInFragment(fragment, sampleIndex) {
+    async fetchChunkInFragment(fragment, sampleIndex, options) {
       if (sampleIndex === -1) {
         return null;
       }
@@ -5539,17 +5587,19 @@ ${cue.notes ?? ""}`;
       const trackData = fragment.trackData.get(this.internalTrack.id);
       const sample = trackData.samples[sampleIndex];
       assert(sample);
-      await this.internalTrack.demuxer.chunkReader.reader.loadRange(fragment.dataStart, fragment.dataEnd);
-      const data = this.internalTrack.demuxer.chunkReader.readRange(
-        sample.byteOffset,
-        sample.byteOffset + sample.byteSize
-      );
-      const chunk = new EncodedVideoChunk({
-        data,
-        timestamp: 1e6 * sample.presentationTimestamp / this.internalTrack.timescale,
-        duration: 1e6 * sample.duration / this.internalTrack.timescale,
-        type: sample.isKeyFrame ? "key" : "delta"
-      });
+      let data;
+      if (options.metadataOnly) {
+        data = new Uint8Array(0);
+      } else {
+        await this.internalTrack.demuxer.chunkReader.reader.loadRange(fragment.dataStart, fragment.dataEnd);
+        data = this.internalTrack.demuxer.chunkReader.readRange(
+          sample.byteOffset,
+          sample.byteOffset + sample.byteSize
+        );
+      }
+      const timestamp = 1e6 * sample.presentationTimestamp / this.internalTrack.timescale;
+      const duration = 1e6 * sample.duration / this.internalTrack.timescale;
+      const chunk = this.createChunk(data, timestamp, duration, sample.isKeyFrame);
       this.chunkToFragmentLocation.set(chunk, { fragment, sampleIndex });
       this.fragmentLocationToChunk.set(compositeKey, new WeakRef(chunk));
       return chunk;
@@ -5589,10 +5639,10 @@ ${cue.notes ?? ""}`;
         const trackData = fragment.trackData.get(this.internalTrack.id);
         const index = trackData.presentationTimestamps.findLastIndex((x) => {
           const sample = trackData.samples[x.sampleIndex];
-          return sample.isKeyFrame;
+          return sample.isKeyFrame && x.presentationTimestamp <= timestampInTimescale;
         });
         if (index === -1) {
-          throw new Error("Not supported: Fragment does not contain key sample.");
+          throw new Error("Not supported: Fragment does not begin with a key sample.");
         }
         const entry = trackData.presentationTimestamps[index];
         sampleIndex = entry.sampleIndex;
@@ -5601,15 +5651,15 @@ ${cue.notes ?? ""}`;
       return { fragmentIndex, sampleIndex, correctSampleFound };
     }
     /** Looks for a sample in the fragments while trying to load as few fragments as possible to retrieve it. */
-    async performFragmentedLookup(getBestMatch, earliestTimestamp, latestTimestamp) {
-      const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
-      if (correctSampleFound) {
-        const fragment = this.internalTrack.fragments[fragmentIndex];
-        return this.fetchChunkInFragment(fragment, sampleIndex);
-      }
+    async performFragmentedLookup(getBestMatch, searchTimestamp, latestTimestamp, options) {
       const demuxer = this.internalTrack.demuxer;
       const release = await demuxer.fragmentLookupMutex.acquire();
       try {
+        const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
+        if (correctSampleFound) {
+          const fragment = this.internalTrack.fragments[fragmentIndex];
+          return this.fetchChunkInFragment(fragment, sampleIndex, options);
+        }
         const isobmffReader = demuxer.isobmffReader;
         const sourceSize = await isobmffReader.reader.source._getSize();
         let prevFragment = null;
@@ -5619,7 +5669,7 @@ ${cue.notes ?? ""}`;
         if (this.internalTrack.fragmentLookupTable) {
           const index = binarySearchLessOrEqual(
             this.internalTrack.fragmentLookupTable,
-            earliestTimestamp,
+            searchTimestamp,
             (x) => x.timestamp
           );
           if (index !== -1) {
@@ -5662,7 +5712,7 @@ ${cue.notes ?? ""}`;
               const { fragmentIndex: fragmentIndex2, sampleIndex: sampleIndex2, correctSampleFound: correctSampleFound2 } = getBestMatch();
               if (correctSampleFound2) {
                 const fragment2 = this.internalTrack.fragments[fragmentIndex2];
-                return this.fetchChunkInFragment(fragment2, sampleIndex2);
+                return this.fetchChunkInFragment(fragment2, sampleIndex2, options);
               }
               if (fragmentIndex2 !== -1) {
                 bestFragmentIndex = fragmentIndex2;
@@ -5678,7 +5728,7 @@ ${cue.notes ?? ""}`;
         }
         if (bestFragmentIndex !== -1) {
           const fragment = this.internalTrack.fragments[bestFragmentIndex];
-          return this.fetchChunkInFragment(fragment, bestSampleIndex);
+          return this.fetchChunkInFragment(fragment, bestSampleIndex, options);
         }
         return null;
       } finally {
@@ -5686,6 +5736,42 @@ ${cue.notes ?? ""}`;
       }
     }
   };
+  var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
+    internalTrack;
+    constructor(internalTrack) {
+      super(internalTrack);
+      this.internalTrack = internalTrack;
+    }
+    async getCodec() {
+      return this.internalTrack.info.codec;
+    }
+    async getWidth() {
+      return this.internalTrack.info.width;
+    }
+    async getHeight() {
+      return this.internalTrack.info.height;
+    }
+    async getRotation() {
+      return this.internalTrack.rotation;
+    }
+    async getDecoderConfig() {
+      return {
+        codec: extractVideoCodecString(this.internalTrack.info.codec, this.internalTrack.info.codecDescription),
+        codedWidth: this.internalTrack.info.width,
+        codedHeight: this.internalTrack.info.height,
+        description: this.internalTrack.info.codecDescription ?? void 0,
+        colorSpace: this.internalTrack.info.colorSpace ?? void 0
+      };
+    }
+    createChunk(data, timestamp, duration, isKeyFrame) {
+      return new EncodedVideoChunk({
+        data,
+        timestamp,
+        duration,
+        type: isKeyFrame ? "key" : "delta"
+      });
+    }
+  };
   var IsobmffAudioTrackBacking = class extends IsobmffTrackBacking {
     internalTrack;
     constructor(internalTrack) {
@@ -5709,6 +5795,14 @@ ${cue.notes ?? ""}`;
         description: this.internalTrack.info.codecDescription ?? void 0
       };
     }
+    createChunk(data, timestamp, duration, isKeyFrame) {
+      return new EncodedAudioChunk({
+        data,
+        timestamp,
+        duration,
+        type: isKeyFrame ? "key" : "delta"
+      });
+    }
   };
   var getSampleIndexForTimestamp = (sampleTable, timescaleUnits) => {
     const index = binarySearchLessOrEqual(
@@ -5870,9 +5964,9 @@ ${cue.notes ?? ""}`;
       assert(this._format);
       return this._format;
     }
-    async getDuration() {
+    async computeDuration() {
       const demuxer = await this._getDemuxer();
-      return demuxer.getDuration();
+      return demuxer.computeDuration();
     }
     async getTracks() {
       const demuxer = await this._getDemuxer();
@@ -5901,25 +5995,7 @@ ${cue.notes ?? ""}`;
   };
 
   // src/media-drain.ts
-  var EncodedVideoChunkDrain = class {
-    constructor(videoTrack) {
-      this.videoTrack = videoTrack;
-    }
-    getFirstChunk() {
-      return this.videoTrack._backing.getFirstChunk();
-    }
-    getChunk(timestamp) {
-      return this.videoTrack._backing.getChunk(timestamp);
-    }
-    getNextChunk(chunk) {
-      return this.videoTrack._backing.getNextChunk(chunk);
-    }
-    getKeyChunk(timestamp) {
-      return this.videoTrack._backing.getKeyChunk(timestamp);
-    }
-    getNextKeyChunk(chunk) {
-      return this.videoTrack._backing.getNextKeyChunk(chunk);
-    }
+  var BaseChunkDrain = class {
     async *chunks(startChunk, endTimestamp = Infinity) {
       const chunkQueue = [];
       let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
@@ -5968,26 +6044,12 @@ ${cue.notes ?? ""}`;
       }
     }
   };
-  var VideoFrameDrain = class {
-    constructor(videoTrack) {
-      this.videoTrack = videoTrack;
-    }
-    decoderConfig = null;
-    async createDecoder(onFrame) {
-      if (!this.decoderConfig) {
-        this.decoderConfig = await this.videoTrack.getDecoderConfig();
-      }
-      const decoder = new VideoDecoder({
-        output: onFrame,
-        error: (error) => console.error(error)
-      });
-      decoder.configure(this.decoderConfig);
-      return decoder;
-    }
-    async getKeyFrame(timestamp) {
+  var BaseMediaFrameDrain = class {
+    async getKeyMediaFrame(timestamp) {
       let result = null;
       const decoder = await this.createDecoder((frame) => result = frame);
-      const chunk = await this.videoTrack._backing.getKeyChunk(timestamp);
+      const chunkDrain = this.createChunkDrain();
+      const chunk = await chunkDrain.getKeyChunk(timestamp);
       if (!chunk) {
         return null;
       }
@@ -5996,7 +6058,7 @@ ${cue.notes ?? ""}`;
       decoder.close();
       return result;
     }
-    async getFrame(timestamp) {
+    async getMediaFrame(timestamp) {
       let result = null;
       const decoder = await this.createDecoder((frame) => {
         if (frame.timestamp / 1e6 <= timestamp) {
@@ -6006,16 +6068,17 @@ ${cue.notes ?? ""}`;
           frame.close();
         }
       });
-      const keyChunk = await this.videoTrack._backing.getKeyChunk(timestamp);
+      const chunkDrain = this.createChunkDrain();
+      const keyChunk = await chunkDrain.getKeyChunk(timestamp);
       if (!keyChunk) {
         return null;
       }
-      const targetChunk = await this.videoTrack._backing.getChunk(timestamp);
+      const targetChunk = await chunkDrain.getChunk(timestamp);
       assert(targetChunk);
       decoder.decode(keyChunk);
       let currentChunk = keyChunk;
       while (currentChunk !== targetChunk) {
-        const nextChunk = await this.videoTrack._backing.getNextChunk(currentChunk);
+        const nextChunk = await chunkDrain.getNextChunk(currentChunk);
         assert(nextChunk);
         currentChunk = nextChunk;
         decoder.decode(nextChunk);
@@ -6027,7 +6090,7 @@ ${cue.notes ?? ""}`;
       decoder.close();
       return result;
     }
-    async *frames(startTimestamp = 0, endTimestamp = Infinity) {
+    async *mediaFrames(startTimestamp = 0, endTimestamp = Infinity) {
       const frameQueue = [];
       let firstFrameQueued = false;
       let lastFrame = null;
@@ -6060,7 +6123,8 @@ ${cue.notes ?? ""}`;
           ({ promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers());
         }
       });
-      const keyChunk = await this.videoTrack._backing.getKeyChunk(startTimestamp) ?? await this.videoTrack._backing.getFirstChunk();
+      const chunkDrain = this.createChunkDrain();
+      const keyChunk = await chunkDrain.getKeyChunk(startTimestamp) ?? await chunkDrain.getFirstChunk();
       if (!keyChunk) {
         return;
       }
@@ -6069,13 +6133,12 @@ ${cue.notes ?? ""}`;
         let currentChunk = keyChunk;
         let chunksEndTimestamp = Infinity;
         if (endTimestamp < Infinity) {
-          const endFrame = await this.videoTrack._backing.getChunk(endTimestamp);
-          const endKeyFrame = !endFrame ? null : endFrame.type === "key" && endFrame.timestamp / 1e6 === endTimestamp ? endFrame : await this.videoTrack._backing.getNextKeyChunk(endFrame);
+          const endFrame = await chunkDrain.getChunk(endTimestamp);
+          const endKeyFrame = !endFrame ? null : endFrame.type === "key" && endFrame.timestamp / 1e6 === endTimestamp ? endFrame : await chunkDrain.getNextKeyChunk(endFrame);
           if (endKeyFrame) {
             chunksEndTimestamp = endKeyFrame.timestamp / 1e6;
           }
         }
-        const chunkDrain = new EncodedVideoChunkDrain(this.videoTrack);
         const chunks = chunkDrain.chunks(keyChunk, chunksEndTimestamp);
         await chunks.next();
         while (currentChunk && !ended) {
@@ -6113,6 +6176,145 @@ ${cue.notes ?? ""}`;
       }
     }
   };
+  var EncodedVideoChunkDrain = class extends BaseChunkDrain {
+    constructor(videoTrack) {
+      super();
+      this.videoTrack = videoTrack;
+    }
+    getFirstChunk(options = {}) {
+      return this.videoTrack._backing.getFirstChunk(options);
+    }
+    getChunk(timestamp, options = {}) {
+      return this.videoTrack._backing.getChunk(timestamp, options);
+    }
+    getNextChunk(chunk, options = {}) {
+      return this.videoTrack._backing.getNextChunk(chunk, options);
+    }
+    getKeyChunk(timestamp, options = {}) {
+      return this.videoTrack._backing.getKeyChunk(timestamp, options);
+    }
+    getNextKeyChunk(chunk, options = {}) {
+      return this.videoTrack._backing.getNextKeyChunk(chunk, options);
+    }
+  };
+  var VideoFrameDrain = class extends BaseMediaFrameDrain {
+    constructor(videoTrack) {
+      super();
+      this.videoTrack = videoTrack;
+    }
+    decoderConfig = null;
+    async createDecoder(onFrame) {
+      if (!this.decoderConfig) {
+        this.decoderConfig = await this.videoTrack.getDecoderConfig();
+      }
+      const decoder = new VideoDecoder({
+        output: onFrame,
+        error: (error) => console.error(error)
+      });
+      decoder.configure(this.decoderConfig);
+      return decoder;
+    }
+    createChunkDrain() {
+      return new EncodedVideoChunkDrain(this.videoTrack);
+    }
+    getKeyFrame(timestamp) {
+      return this.getKeyMediaFrame(timestamp);
+    }
+    getFrame(timestamp) {
+      return this.getMediaFrame(timestamp);
+    }
+    frames(startTimestamp = 0, endTimestamp = Infinity) {
+      return this.mediaFrames(startTimestamp, endTimestamp);
+    }
+  };
+  var EncodedAudioChunkDrain = class extends BaseChunkDrain {
+    constructor(audioTrack) {
+      super();
+      this.audioTrack = audioTrack;
+    }
+    getFirstChunk(options = {}) {
+      return this.audioTrack._backing.getFirstChunk(options);
+    }
+    getChunk(timestamp, options = {}) {
+      return this.audioTrack._backing.getChunk(timestamp, options);
+    }
+    getNextChunk(chunk, options = {}) {
+      return this.audioTrack._backing.getNextChunk(chunk, options);
+    }
+    getKeyChunk(timestamp, options = {}) {
+      return this.audioTrack._backing.getKeyChunk(timestamp, options);
+    }
+    getNextKeyChunk(chunk, options = {}) {
+      return this.audioTrack._backing.getNextKeyChunk(chunk, options);
+    }
+  };
+  var AudioDataDrain = class extends BaseMediaFrameDrain {
+    constructor(audioTrack) {
+      super();
+      this.audioTrack = audioTrack;
+    }
+    decoderConfig = null;
+    async createDecoder(onData) {
+      if (!this.decoderConfig) {
+        this.decoderConfig = await this.audioTrack.getDecoderConfig();
+      }
+      const decoder = new AudioDecoder({
+        output: onData,
+        error: (error) => console.error(error)
+      });
+      decoder.configure(this.decoderConfig);
+      return decoder;
+    }
+    createChunkDrain() {
+      return new EncodedAudioChunkDrain(this.audioTrack);
+    }
+    getKeyData(timestamp) {
+      return this.getKeyMediaFrame(timestamp);
+    }
+    getData(timestamp) {
+      return this.getMediaFrame(timestamp);
+    }
+    data(startTimestamp = 0, endTimestamp = Infinity) {
+      return this.mediaFrames(startTimestamp, endTimestamp);
+    }
+  };
+  var AudioBufferDrain = class {
+    constructor(audioTrack) {
+      this.audioTrack = audioTrack;
+      this.audioDataDrain = new AudioDataDrain(audioTrack);
+    }
+    audioDataDrain;
+    audioDataToWrappedArrayBuffer(data) {
+      if (!data) {
+        return null;
+      }
+      const audioBuffer = new AudioBuffer({
+        numberOfChannels: data.numberOfChannels,
+        length: data.numberOfFrames,
+        sampleRate: data.sampleRate
+      });
+      for (let i = 0; i < data.numberOfChannels; i++) {
+        const dataBytes = new Float32Array(data.allocationSize({ planeIndex: i }));
+        data.copyTo(dataBytes, { planeIndex: i });
+        audioBuffer.copyToChannel(dataBytes, i);
+      }
+      return {
+        buffer: audioBuffer,
+        timestamp: data.timestamp / 1e6
+      };
+    }
+    async getBuffer(timestamp) {
+      const data = await this.audioDataDrain.getData(timestamp);
+      return this.audioDataToWrappedArrayBuffer(data);
+    }
+    async *buffers(startTimestamp = 0, endTimestamp = Infinity) {
+      for await (const data of this.audioDataDrain.data(startTimestamp, endTimestamp)) {
+        const result = this.audioDataToWrappedArrayBuffer(data);
+        data.close();
+        yield result;
+      }
+    }
+  };
   return __toCommonJS(src_exports);
 })();
 if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Metamuxer)
diff --git a/dist/metamuxer.min.js b/dist/metamuxer.min.js
index a815831..a4ad80c 100644
--- a/dist/metamuxer.min.js
+++ b/dist/metamuxer.min.js
@@ -1,10 +1,10 @@
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i={track:e,type:"subtitle",info:{config:t.config},timescale:1e3,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[],lastCueEndTimestamp:0,cueQueue:[],nextSourceId:0,cueToSourceId:new WeakMap};return this.trackDatas.push(i),this.trackDatas.sort((a,n)=>a.track.id-n.track.id),this.validateAndNormalizeTimestamp(e,0,!0),i}async addEncodedVideoChunk(e,t,s){let i=await this.mutex.acquire();try{let a=this.getVideoTrackData(e,s),n=new Uint8Array(t.byteLength);t.copyTo(n);let c=this.validateAndNormalizeTimestamp(a.track,t.timestamp,t.type==="key"),o=this.createSampleForTrack(a,n,c,(t.duration??0)/1e6,t.type);await this.registerSample(a,o)}finally{i()}}async addEncodedAudioChunk(e,t,s){let i=await this.mutex.acquire();try{let a=this.getAudioTrackData(e,s),n=new Uint8Array(t.byteLength);t.copyTo(n);let 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this.registerSample(e,l),e.lastCueEndTimestamp=a}this.auxWriter.seek(0);for(let u=0;u<e.cueQueue.length;u++){let d=e.cueQueue[u];if(d.timestamp>=n)break;se.lastIndex=0;let l=se.test(d.text),g=d.timestamp+d.duration,h=e.cueToSourceId.get(d);if(h===void 0&&n<g&&(h=e.nextSourceId++,e.cueToSourceId.set(d,h)),d.notes){let p=$t(d.notes);this.auxBoxWriter.writeBox(p)}let b=Lt(d.text,l?a:null,d.identifier??null,d.settings??null,h??null);this.auxBoxWriter.writeBox(b),g===n&&e.cueQueue.splice(u--,1)}let c=this.auxWriter.getSlice(0,this.auxWriter.getPos()),o=this.createSampleForTrack(e,c,a,n-a,"key");await this.registerSample(e,o),e.lastCueEndTimestamp=n}}createSampleForTrack(e,t,s,i,a){return{timestamp:s,decodeTimestamp:s,duration:i,data:t,size:t.byteLength,type:a,timescaleUnitsToNextSample:E(i,e.timescale)}}processTimestamps(e){if(e.timestampProcessingQueue.length===0)return;let t=e.timestampProcessingQueue.map(s=>s.timestamp).sort((s,i)=>s-i);for(let s=0;s<e.timestampProcessingQueue.length;s++){let i=e.timestampProcessingQueue[s];i.decodeTimestamp=t[s];let a=E(i.timestamp-i.decodeTimestamp,e.timescale),n=E(i.duration,e.timescale);if(e.lastTimescaleUnits!==null){m(e.lastSample);let c=E(i.decodeTimestamp,e.timescale,!1),o=Math.round(c-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=o,e.lastSample.timescaleUnitsToNextSample=o,this.fastStart!=="fragmented"){let u=_(e.timeToSampleTable);if(m(u),u.sampleCount===1){u.sampleDelta=o;let l=e.timeToSampleTable[e.timeToSampleTable.length-2];l&&l.sampleDelta===o&&(l.sampleCount++,e.timeToSampleTable.pop(),u=l)}else u.sampleDelta!==o&&(u.sampleCount--,e.timeToSampleTable.push(u={sampleCount:1,sampleDelta:o}));u.sampleDelta===n?u.sampleCount++:e.timeToSampleTable.push({sampleCount:1,sampleDelta:n});let d=_(e.compositionTimeOffsetTable);m(d),d.sampleCompositionTimeOffset===a?d.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:a})}}else e.lastTimescaleUnits=0,this.fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:n}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:a}));e.lastSample=i}e.timestampProcessingQueue.length=0}async registerSample(e,t){this.fastStart==="fragmented"?(e.sampleQueue.push(t),await this.interleaveSamples()):await this.addSampleToTrack(e,t)}async addSampleToTrack(e,t){t.type==="key"&&this.processTimestamps(e),this.fastStart!=="fragmented"&&e.samples.push(t);let s=!1;if(!e.currentChunk)s=!0;else{let i=t.timestamp-e.currentChunk.startTimestamp;if(this.fastStart==="fragmented"){let a=this.trackDatas.every(n=>{if(e===n)return t.type==="key";let c=n.sampleQueue[0];return c&&c.type==="key"});i>=1&&a&&(s=!0,await this.finalizeFragment())}else s=i>=.5}s&&(e.currentChunk&&await this.finalizeCurrentChunk(e),e.currentChunk={startTimestamp:t.timestamp,samples:[],offset:null,moofOffset:null}),m(e.currentChunk),e.currentChunk.samples.push(t),e.timestampProcessingQueue.push(t)}async finalizeCurrentChunk(e){if(m(this.fastStart!=="fragmented"),!!e.currentChunk){if(e.finalizedChunks.push(e.currentChunk),this.finalizedChunks.push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||_(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),this.fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=this.writer.getPos();for(let t of e.currentChunk.samples)m(t.data),this.writer.write(t.data),t.data=null;await this.writer.flush()}}async interleaveSamples(){m(this.fastStart==="fragmented");for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let i of this.trackDatas){if(i.sampleQueue.length===0&&!i.track.source._closed)break e;i.sampleQueue.length>0&&i.sampleQueue[0].timestamp<t&&(e=i,t=i.sampleQueue[0].timestamp)}if(!e)break;let s=e.sampleQueue.shift();await this.addSampleToTrack(e,s)}}async finalizeFragment(e=!0){m(this.fastStart==="fragmented");let t=this.nextFragmentNumber++;if(t===1){let o=pe(this.trackDatas,this.creationTime,!0);this.boxWriter.writeBox(o)}let s=this.trackDatas.filter(o=>o.currentChunk),i=this.writer.getPos(),a=kt(t,s);this.boxWriter.writeBox(a);{let o=Fe(!1),u=0;for(let l of s)for(let g of l.currentChunk.samples)u+=g.size;let d=this.boxWriter.measureBox(o)+u;d>=2**32&&(o.largeSize=!0,d=this.boxWriter.measureBox(o)+u),o.size=d,this.boxWriter.writeBox(o)}for(let o of s){o.currentChunk.offset=this.writer.getPos(),o.currentChunk.moofOffset=i;for(let u of o.currentChunk.samples)this.writer.write(u.data),u.data=null}let n=this.writer.getPos();this.writer.seek(this.boxWriter.offsets.get(a));let c=kt(t,s);this.boxWriter.writeBox(c),this.writer.seek(n);for(let o of s)o.finalizedChunks.push(o.currentChunk),this.finalizedChunks.push(o.currentChunk),o.currentChunk=null;e&&await this.writer.flush()}async onTrackClose(e){let t=await this.mutex.acquire();if(e.type==="subtitle"&&e.source._codec==="webvtt"){let s=this.trackDatas.find(i=>i.track===e);s&&await this.processWebVTTCues(s,1/0)}this.fastStart==="fragmented"&&await this.interleaveSamples(),t()}async finalize(){let e=await this.mutex.acquire();for(let t of this.trackDatas)t.type==="subtitle"&&t.track.source._codec==="webvtt"&&await this.processWebVTTCues(t,1/0);if(this.fastStart==="fragmented"){for(let t of this.trackDatas){for(let s of t.sampleQueue)await this.addSampleToTrack(t,s);this.processTimestamps(t)}await this.finalizeFragment(!1)}else for(let t of this.trackDatas)this.processTimestamps(t),await 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instanceof Uint8Array)this.writer.write(e);else if(Array.isArray(e))for(let t of e)this.writeEBML(t);else if(this.offsets.set(e,this.writer.getPos()),this.writeUnsignedInt(e.id),Array.isArray(e.data)){let t=this.writer.getPos(),s=e.size===-1?1:e.size??4;e.size===-1?this.writeByte(255):this.writer.seek(this.writer.getPos()+s);let i=this.writer.getPos();if(this.dataOffsets.set(e,i),this.writeEBML(e.data),e.size!==-1){let a=this.writer.getPos()-i,n=this.writer.getPos();this.writer.seek(t),this.writeEBMLVarInt(a,s),this.writer.seek(n)}}else if(typeof e.data=="number"){let t=e.size??Tt(e.data);this.writeEBMLVarInt(t),this.writeUnsignedInt(e.data,t)}else if(typeof e.data=="string")this.writeEBMLVarInt(e.data.length),this.writeString(e.data);else if(e.data instanceof Uint8Array)this.writeEBMLVarInt(e.data.byteLength,e.size),this.writer.write(e.data);else if(e.data instanceof ge)this.writeEBMLVarInt(4),this.writeFloat32(e.data.value);else if(e.data instanceof 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pe(this.auxWriter);ftypSize=null;mdat=null;trackDatas=[];creationTime=Math.floor(Date.now()/1e3)+yi;finalizedChunks=[];nextFragmentNumber=1;constructor(e,t){super(e),this.writer=e._writer,this.boxWriter=new pe(this.writer);let r=this.writer instanceof oe?"in-memory":!1;this.fastStart=t._options.fastStart??r,(this.fastStart==="in-memory"||this.fastStart==="fragmented")&&(this.writer.ensureMonotonicity=!0)}async start(){let e=await this.mutex.acquire(),t=this.output._tracks.some(r=>r.type==="video"&&r.source._codec==="avc");this.boxWriter.writeBox(Kt({holdsAvc:t,fragmented:this.fastStart==="fragmented"})),this.ftypSize=this.writer.getPos(),this.fastStart==="in-memory"?this.mdat=Pe(!1):this.fastStart==="fragmented"||(this.mdat=Pe(!0),this.boxWriter.writeBox(this.mdat)),await this.writer.flush(),e()}getVideoTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Be(t),d(t),d(t.decoderConfig),d(t.decoderConfig.codedWidth!==void 0),d(t.decoderConfig.codedHeight!==void 0);let 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this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getSubtitleTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;We(t),d(t),d(t.config);let s={track:e,type:"subtitle",info:{config:t.config},timescale:1e3,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[],lastCueEndTimestamp:0,cueQueue:[],nextSourceId:0,cueToSourceId:new WeakMap};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),this.validateAndNormalizeTimestamp(e,0,!0),s}async addEncodedVideoChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getVideoTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=this.validateAndNormalizeTimestamp(n.track,t.timestamp,t.type==="key"),o=this.createSampleForTrack(n,a,c,(t.duration??0)/1e6,t.type);await this.registerSample(n,o)}finally{s()}}async addEncodedAudioChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getAudioTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=t.type,o=this.validateAndNormalizeTimestamp(n.track,t.timestamp,c==="key"),u=this.createSampleForTrack(n,a,o,(t.duration??0)/1e6,c);await this.registerSample(n,u)}finally{s()}}async addSubtitleCue(e,t,r){let s=await this.mutex.acquire();try{let n=this.getSubtitleTrackData(e,r);this.validateAndNormalizeTimestamp(n.track,1e6*t.timestamp,!0),e.source._codec==="webvtt"&&(n.cueQueue.push(t),await this.processWebVTTCues(n,t.timestamp))}finally{s()}}async processWebVTTCues(e,t){for(;e.cueQueue.length>0;){let r=new Set([]);for(let u of e.cueQueue)d(u.timestamp<=t),d(e.lastCueEndTimestamp<=u.timestamp+u.duration),r.add(Math.max(u.timestamp,e.lastCueEndTimestamp)),r.add(u.timestamp+u.duration);let s=[...r].sort((u,m)=>u-m),n=s[0],a=s[1]??n;if(t<a)break;if(e.lastCueEndTimestamp<n){this.auxWriter.seek(0);let u=qt();this.auxBoxWriter.writeBox(u);let m=this.auxWriter.getSlice(0,this.auxWriter.getPos()),l=this.createSampleForTrack(e,m,e.lastCueEndTimestamp,n-e.lastCueEndTimestamp,"key");await this.registerSample(e,l),e.lastCueEndTimestamp=n}this.auxWriter.seek(0);for(let u=0;u<e.cueQueue.length;u++){let m=e.cueQueue[u];if(m.timestamp>=a)break;ne.lastIndex=0;let l=ne.test(m.text),p=m.timestamp+m.duration,h=e.cueToSourceId.get(m);if(h===void 0&&a<p&&(h=e.nextSourceId++,e.cueToSourceId.set(m,h)),m.notes){let k=Gt(m.notes);this.auxBoxWriter.writeBox(k)}let b=Xt(m.text,l?n:null,m.identifier??null,m.settings??null,h??null);this.auxBoxWriter.writeBox(b),p===a&&e.cueQueue.splice(u--,1)}let c=this.auxWriter.getSlice(0,this.auxWriter.getPos()),o=this.createSampleForTrack(e,c,n,a-n,"key");await this.registerSample(e,o),e.lastCueEndTimestamp=a}}createSampleForTrack(e,t,r,s,n){return{timestamp:r,decodeTimestamp:r,duration:s,data:t,size:t.byteLength,type:n,timescaleUnitsToNextSample:V(s,e.timescale)}}processTimestamps(e){if(e.timestampProcessingQueue.length===0)return;let t=e.timestampProcessingQueue.map(r=>r.timestamp).sort((r,s)=>r-s);for(let r=0;r<e.timestampProcessingQueue.length;r++){let s=e.timestampProcessingQueue[r];s.decodeTimestamp=t[r];let n=V(s.timestamp-s.decodeTimestamp,e.timescale),a=V(s.duration,e.timescale);if(e.lastTimescaleUnits!==null){d(e.lastSample);let c=V(s.decodeTimestamp,e.timescale,!1),o=Math.round(c-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=o,e.lastSample.timescaleUnitsToNextSample=o,this.fastStart!=="fragmented"){let u=A(e.timeToSampleTable);if(d(u),u.sampleCount===1){u.sampleDelta=o;let l=e.timeToSampleTable[e.timeToSampleTable.length-2];l&&l.sampleDelta===o&&(l.sampleCount++,e.timeToSampleTable.pop(),u=l)}else u.sampleDelta!==o&&(u.sampleCount--,e.timeToSampleTable.push(u={sampleCount:1,sampleDelta:o}));u.sampleDelta===a?u.sampleCount++:e.timeToSampleTable.push({sampleCount:1,sampleDelta:a});let m=A(e.compositionTimeOffsetTable);d(m),m.sampleCompositionTimeOffset===n?m.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:n})}}else e.lastTimescaleUnits=0,this.fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:a}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:n}));e.lastSample=s}e.timestampProcessingQueue.length=0}async registerSample(e,t){this.fastStart==="fragmented"?(e.sampleQueue.push(t),await this.interleaveSamples()):await this.addSampleToTrack(e,t)}async addSampleToTrack(e,t){t.type==="key"&&this.processTimestamps(e),this.fastStart!=="fragmented"&&e.samples.push(t);let r=!1;if(!e.currentChunk)r=!0;else{let s=t.timestamp-e.currentChunk.startTimestamp;if(this.fastStart==="fragmented"){let n=this.trackDatas.every(a=>{if(e===a)return t.type==="key";let c=a.sampleQueue[0];return c&&c.type==="key"});s>=1&&n&&(r=!0,await this.finalizeFragment())}else r=s>=.5}r&&(e.currentChunk&&await this.finalizeCurrentChunk(e),e.currentChunk={startTimestamp:t.timestamp,samples:[],offset:null,moofOffset:null}),d(e.currentChunk),e.currentChunk.samples.push(t),e.timestampProcessingQueue.push(t)}async finalizeCurrentChunk(e){if(d(this.fastStart!=="fragmented"),!!e.currentChunk){if(e.finalizedChunks.push(e.currentChunk),this.finalizedChunks.push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||A(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),this.fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=this.writer.getPos();for(let t of e.currentChunk.samples)d(t.data),this.writer.write(t.data),t.data=null;await this.writer.flush()}}async interleaveSamples(){d(this.fastStart==="fragmented");for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let s of this.trackDatas){if(s.sampleQueue.length===0&&!s.track.source._closed)break e;s.sampleQueue.length>0&&s.sampleQueue[0].timestamp<t&&(e=s,t=s.sampleQueue[0].timestamp)}if(!e)break;let r=e.sampleQueue.shift();await this.addSampleToTrack(e,r)}}async finalizeFragment(e=!0){d(this.fastStart==="fragmented");let t=this.nextFragmentNumber++;if(t===1){let o=he(this.trackDatas,this.creationTime,!0);this.boxWriter.writeBox(o)}let r=this.trackDatas.filter(o=>o.currentChunk),s=this.writer.getPos(),n=wt(t,r);this.boxWriter.writeBox(n);{let o=Pe(!1),u=0;for(let l of r)for(let p of l.currentChunk.samples)u+=p.size;let m=this.boxWriter.measureBox(o)+u;m>=2**32&&(o.largeSize=!0,m=this.boxWriter.measureBox(o)+u),o.size=m,this.boxWriter.writeBox(o)}for(let o of r){o.currentChunk.offset=this.writer.getPos(),o.currentChunk.moofOffset=s;for(let u of o.currentChunk.samples)this.writer.write(u.data),u.data=null}let a=this.writer.getPos();this.writer.seek(this.boxWriter.offsets.get(n));let c=wt(t,r);this.boxWriter.writeBox(c),this.writer.seek(a);for(let o of r)o.finalizedChunks.push(o.currentChunk),this.finalizedChunks.push(o.currentChunk),o.currentChunk=null;e&&await this.writer.flush()}async onTrackClose(e){let t=await this.mutex.acquire();if(e.type==="subtitle"&&e.source._codec==="webvtt"){let r=this.trackDatas.find(s=>s.track===e);r&&await this.processWebVTTCues(r,1/0)}this.fastStart==="fragmented"&&await this.interleaveSamples(),t()}async finalize(){let e=await this.mutex.acquire();for(let t of this.trackDatas)t.type==="subtitle"&&t.track.source._codec==="webvtt"&&await this.processWebVTTCues(t,1/0);if(this.fastStart==="fragmented"){for(let t of this.trackDatas){for(let r of t.sampleQueue)await this.addSampleToTrack(t,r);this.processTimestamps(t)}await this.finalizeFragment(!1)}else for(let t of this.trackDatas)this.processTimestamps(t),await this.finalizeCurrentChunk(t);if(this.fastStart==="in-memory"){d(this.mdat);let t;for(let s=0;s<2;s++){let n=he(this.trackDatas,this.creationTime),a=this.boxWriter.measureBox(n);t=this.boxWriter.measureBox(this.mdat);let c=this.writer.getPos()+a+t;for(let o of this.finalizedChunks){o.offset=c;for(let{data:u}of o.samples)d(u),c+=u.byteLength,t+=u.byteLength}if(c<2**32)break;t>=2**32&&(this.mdat.largeSize=!0)}let r=he(this.trackDatas,this.creationTime);this.boxWriter.writeBox(r),this.mdat.size=t,this.boxWriter.writeBox(this.mdat);for(let s of this.finalizedChunks)for(let n of s.samples)d(n.data),this.writer.write(n.data),n.data=null}else if(this.fastStart==="fragmented"){let t=this.writer.getPos(),r=jt(this.trackDatas);this.boxWriter.writeBox(r);let s=this.writer.getPos()-t;this.writer.seek(this.writer.getPos()-4),this.boxWriter.writeU32(s)}else{d(this.mdat),d(this.ftypSize!==null);let t=this.boxWriter.offsets.get(this.mdat);d(t!==void 0);let r=this.writer.getPos()-t;this.mdat.size=r,this.mdat.largeSize=r>=2**32,this.boxWriter.patchBox(this.mdat);let s=he(this.trackDatas,this.creationTime);if(typeof this.fastStart=="object"){this.writer.seek(this.ftypSize),this.boxWriter.writeBox(s);let n=t-this.writer.getPos();this.boxWriter.writeBox($t(n))}else this.boxWriter.writeBox(s)}e()}};var ge=class{value;constructor(e){this.value=e}},ue=class{value;constructor(e){this.value=e}},Te=class{value;constructor(e){this.value=e}};var vt=i=>i<256?1:i<65536?2:i<1<<24?3:i<2**32?4:i<2**40?5:6,It=i=>i>=-64&&i<64?1:i>=-8192&&i<8192?2:i>=-(1<<20)&&i<1<<20?3:i>=-(1<<27)&&i<1<<27?4:i>=-(2**34)&&i<2**34?5:6,or=i=>{if(i<127)return 1;if(i<16383)return 2;if(i<(1<<21)-1)return 3;if(i<(1<<28)-1)return 4;if(i<2**35-1)return 5;if(i<2**42-1)return 6;throw new Error("EBML VINT size not supported "+i)};var At=2**15,cr="https://github.com/Vanilagy/webm-muxer",ur=6,mr=5,vi={avc:"V_MPEG4/ISO/AVC",hevc:"V_MPEGH/ISO/HEVC",vp8:"V_VP8",vp9:"V_VP9",av1:"V_AV1",aac:"A_AAC",opus:"A_OPUS",webvtt:"S_TEXT/WEBVTT"},Ii={video:1,audio:2,subtitle:17},Le=class extends ae{timestampsMustStartAtZero=!1;writer;format;helper=new Uint8Array(8);helperView=new DataView(this.helper.buffer);offsets=new WeakMap;dataOffsets=new WeakMap;trackDatas=[];segment=null;segmentInfo=null;seekHead=null;tracksElement=null;segmentDuration=null;cues=null;currentCluster=null;currentClusterMsTimestamp=null;trackDatasInCurrentCluster=new Set;duration=0;constructor(e,t){super(e),this.writer=e._writer,this.format=t,this.format._options.streamable&&(this.writer.ensureMonotonicity=!0)}writeByte(e){this.helperView.setUint8(0,e),this.writer.write(this.helper.subarray(0,1))}writeFloat32(e){this.helperView.setFloat32(0,e,!1),this.writer.write(this.helper.subarray(0,4))}writeFloat64(e){this.helperView.setFloat64(0,e,!1),this.writer.write(this.helper)}writeUnsignedInt(e,t=vt(e)){let r=0;switch(t){case 6:this.helperView.setUint8(r++,e/2**40|0);case 5:this.helperView.setUint8(r++,e/2**32|0);case 4:this.helperView.setUint8(r++,e>>24);case 3:this.helperView.setUint8(r++,e>>16);case 2:this.helperView.setUint8(r++,e>>8);case 1:this.helperView.setUint8(r++,e);break;default:throw new Error("Bad UINT size "+t)}this.writer.write(this.helper.subarray(0,r))}writeSignedInt(e,t=It(e)){e<0&&(e+=2**(t*8)),this.writeUnsignedInt(e,t)}writeEBMLVarInt(e,t=or(e)){let r=0;switch(t){case 1:this.helperView.setUint8(r++,128|e);break;case 2:this.helperView.setUint8(r++,64|e>>8),this.helperView.setUint8(r++,e);break;case 3:this.helperView.setUint8(r++,32|e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;case 4:this.helperView.setUint8(r++,16|e>>24),this.helperView.setUint8(r++,e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;case 5:this.helperView.setUint8(r++,8|e/2**32&7),this.helperView.setUint8(r++,e>>24),this.helperView.setUint8(r++,e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;case 6:this.helperView.setUint8(r++,4|e/2**40&3),this.helperView.setUint8(r++,e/2**32|0),this.helperView.setUint8(r++,e>>24),this.helperView.setUint8(r++,e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;default:throw new Error("Bad EBML VINT size "+t)}this.writer.write(this.helper.subarray(0,r))}writeString(e){this.writer.write(new Uint8Array(e.split("").map(t=>t.charCodeAt(0))))}writeEBML(e){if(e!==null){if(e instanceof Uint8Array)this.writer.write(e);else if(Array.isArray(e))for(let t of e)this.writeEBML(t);else if(this.offsets.set(e,this.writer.getPos()),this.writeUnsignedInt(e.id),Array.isArray(e.data)){let t=this.writer.getPos(),r=e.size===-1?1:e.size??4;e.size===-1?this.writeByte(255):this.writer.seek(this.writer.getPos()+r);let s=this.writer.getPos();if(this.dataOffsets.set(e,s),this.writeEBML(e.data),e.size!==-1){let n=this.writer.getPos()-s,a=this.writer.getPos();this.writer.seek(t),this.writeEBMLVarInt(n,r),this.writer.seek(a)}}else if(typeof e.data=="number"){let t=e.size??vt(e.data);this.writeEBMLVarInt(t),this.writeUnsignedInt(e.data,t)}else if(typeof e.data=="string")this.writeEBMLVarInt(e.data.length),this.writeString(e.data);else if(e.data instanceof Uint8Array)this.writeEBMLVarInt(e.data.byteLength,e.size),this.writer.write(e.data);else if(e.data instanceof ge)this.writeEBMLVarInt(4),this.writeFloat32(e.data.value);else if(e.data instanceof ue)this.writeEBMLVarInt(8),this.writeFloat64(e.data.value);else if(e.data instanceof Te){let t=e.size??It(e.data.value);this.writeEBMLVarInt(t),this.writeSignedInt(e.data.value,t)}}}beforeTrackAdd(e){if(this.format instanceof ee)if(e.type==="video"){if(!["vp8","vp9","av1"].includes(e.source._codec))throw new Error("WebM only supports VP8, VP9 and AV1 as video codecs. Switching to MKV removes this restriction.")}else if(e.type==="audio"){if(!["opus","vorbis"].includes(e.source._codec))throw new Error("WebM only supports Opus and Vorbis as audio codecs. Switching to MKV removes this restriction.")}else if(e.type==="subtitle"){if(e.source._codec!=="webvtt")throw new Error("WebM only supports WebVTT as subtitle codec. Switching to MKV removes this restriction.")}else throw new Error("WebM only supports video, audio and subtitle tracks. Switching to MKV removes this restriction.")}async start(){let e=await this.mutex.acquire();this.writeEBMLHeader(),this.format._options.streamable||this.createSeekHead(),this.createSegmentInfo(),this.createCues(),await this.writer.flush(),e()}writeEBMLHeader(){let e={id:440786851,data:[{id:17030,data:1},{id:17143,data:1},{id:17138,data:4},{id:17139,data:8},{id:17026,data:this.format instanceof ee?"webm":"matroska"},{id:17031,data:2},{id:17029,data:2}]};this.writeEBML(e)}createSeekHead(){let e=new Uint8Array([28,83,187,107]),t=new Uint8Array([21,73,169,102]),r=new Uint8Array([22,84,174,107]),s={id:290298740,data:[{id:19899,data:[{id:21419,data:e},{id:21420,size:5,data:0}]},{id:19899,data:[{id:21419,data:t},{id:21420,size:5,data:0}]},{id:19899,data:[{id:21419,data:r},{id:21420,size:5,data:0}]}]};this.seekHead=s}createSegmentInfo(){let e={id:17545,data:new ue(0)};this.segmentDuration=e;let t={id:357149030,data:[{id:2807729,data:1e6},{id:19840,data:cr},{id:22337,data:cr},this.format._options.streamable?null:e]};this.segmentInfo=t}createTracks(){let e={id:374648427,data:[]};this.tracksElement=e;for(let t of this.trackDatas)e.data.push({id:174,data:[{id:215,data:t.track.id},{id:29637,data:t.track.id},{id:131,data:Ii[t.type]},{id:134,data:vi[t.track.source._codec]},t.type==="video"?this.videoSpecificTrackInfo(t):null,t.type==="audio"?this.audioSpecificTrackInfo(t):null,t.type==="subtitle"?this.subtitleSpecificTrackInfo(t):null]})}videoSpecificTrackInfo(e){let t=[e.info.decoderConfig.description?{id:25506,data:Q(e.info.decoderConfig.description)}:null,e.track.metadata.frameRate?{id:2352003,data:1e9/e.track.metadata.frameRate}:null],r=e.info.decoderConfig.colorSpace,s={id:224,data:[{id:176,data:e.info.width},{id:186,data:e.info.height},_e(r)?{id:21936,data:[{id:21937,data:X[r.matrix]},{id:21946,data:q[r.transfer]},{id:21947,data:j[r.primaries]},{id:21945,data:r.fullRange?2:1}]}:null]};return t.push(s),t}audioSpecificTrackInfo(e){return[e.info.decoderConfig.description?{id:25506,data:Q(e.info.decoderConfig.description)}:null,{id:225,data:[{id:181,data:new ge(e.info.sampleRate)},{id:159,data:e.info.numberOfChannels}]}]}subtitleSpecificTrackInfo(e){return[{id:25506,data:M.encode(e.info.config.description)}]}createSegment(){let e={id:408125543,size:this.format._options.streamable?-1:ur,data:[this.format._options.streamable?null:this.seekHead,this.segmentInfo,this.tracksElement]};this.segment=e,this.writeEBML(e)}createCues(){this.cues={id:475249515,data:[]}}get segmentDataOffset(){return d(this.segment),this.dataOffsets.get(this.segment)}getVideoTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Be(t),d(t),d(t.decoderConfig),d(t.decoderConfig.codedWidth!==void 0),d(t.decoderConfig.codedHeight!==void 0);let s={track:e,type:"video",info:{width:t.decoderConfig.codedWidth,height:t.decoderConfig.codedHeight,decoderConfig:t.decoderConfig},chunkQueue:[],lastWrittenMsTimestamp:null};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getAudioTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Ne(t),d(t),d(t.decoderConfig);let s={track:e,type:"audio",info:{numberOfChannels:t.decoderConfig.numberOfChannels,sampleRate:t.decoderConfig.sampleRate,decoderConfig:t.decoderConfig},chunkQueue:[],lastWrittenMsTimestamp:null};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getSubtitleTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;We(t),d(t),d(t.config);let s={track:e,type:"subtitle",info:{config:t.config},chunkQueue:[],lastWrittenMsTimestamp:null};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}async addEncodedVideoChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getVideoTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=t.type==="key",o=this.validateAndNormalizeTimestamp(n.track,t.timestamp,c),u=this.createInternalChunk(a,o,(t.duration??0)/1e6,t.type);e.source._codec==="vp9"&&this.fixVP9ColorSpace(n,u),n.chunkQueue.push(u),await this.interleaveChunks()}finally{s()}}async addEncodedAudioChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getAudioTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=t.type,o=c==="key",u=this.validateAndNormalizeTimestamp(n.track,t.timestamp,o),m=this.createInternalChunk(a,u,(t.duration??0)/1e6,c);n.chunkQueue.push(m),await this.interleaveChunks()}finally{s()}}async addSubtitleCue(e,t,r){let s=await this.mutex.acquire();try{let n=this.getSubtitleTrackData(e,r),a=this.validateAndNormalizeTimestamp(n.track,1e6*t.timestamp,!0),c=t.text,o=Math.floor(a*1e3);ne.lastIndex=0,c=c.replace(ne,p=>{let b=Fe(p.slice(1,-1))-o;return`<${Me(b)}>`});let u=M.encode(c),m=`${t.settings??""}
 ${t.identifier??""}
-${t.notes??""}`,l=this.createInternalChunk(u,n,t.duration,"key",d.trim()?O.encode(d):null);a.chunkQueue.push(l),await this.interleaveChunks()}finally{i()}}async interleaveChunks(){for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let i of this.trackDatas){if(i.chunkQueue.length===0&&!i.track.source._closed)break e;i.chunkQueue.length>0&&i.chunkQueue[0].timestamp<t&&(e=i,t=i.chunkQueue[0].timestamp)}if(!e)break;let s=e.chunkQueue.shift();this.writeBlock(e,s)}await this.writer.flush()}fixVP9ColorSpace(e,t){if(t.type!=="key"||!e.info.decoderConfig.colorSpace||!e.info.decoderConfig.colorSpace.matrix)return;let s=0;if($(t.data,0,2)!==2)return;s+=2;let i=($(t.data,s+1,s+2)<<1)+$(t.data,s+0,s+1);s+=2,i===3&&s++;let a=$(t.data,s+0,s+1);if(s++,a)return;let n=$(t.data,s+0,s+1);if(s++,n!==0)return;s+=2;let c=$(t.data,s+0,s+24);if(s+=24,c!==4817730)return;i>=2&&s++;let o={rgb:7,bt709:2,bt470bg:1,smpte170m:3}[e.info.decoderConfig.colorSpace.matrix];_t(t.data,s+0,s+3,o)}createInternalChunk(e,t,s,i,a=null){return{data:e,type:i,timestamp:t,duration:s,additions:a}}writeBlock(e,t){this.segment||(this.createTracks(),this.createSegment());let s=Math.floor(1e3*t.timestamp),i=this.trackDatas.every(d=>{if(d.track.source._closed)return!0;if(e===d)return t.type==="key";let l=d.chunkQueue[0];return l&&l.type==="key"});(!this.currentCluster||i&&s-this.currentClusterMsTimestamp>=1e3)&&this.createNewCluster(s);let a=s-this.currentClusterMsTimestamp;if(a<0)return;if(a>=St)throw new Error(`Current Matroska cluster exceeded its maximum allowed length of ${St} milliseconds. In order to produce a correct WebM file, you must pass in a key frame at least every ${St} milliseconds.`);let c=new Uint8Array(4),o=new DataView(c.buffer);o.setUint8(0,128|e.track.id),o.setInt16(1,a,!1);let u=Math.floor(1e3*t.duration);if(u===0&&!t.additions){o.setUint8(3,+(t.type==="key")<<7);let d={id:163,data:[c,t.data]};this.writeEBML(d)}else{let d={id:160,data:[{id:161,data:[c,t.data]},t.type==="delta"?{id:251,data:new ke(e.lastWrittenMsTimestamp-s)}:null,t.additions?{id:30113,data:[{id:166,data:[{id:165,data:t.additions},{id:238,data:1}]}]}:null,u>0?{id:155,data:u}:null]};this.writeEBML(d)}this.duration=Math.max(this.duration,s+u),e.lastWrittenMsTimestamp=s,this.trackDatasInCurrentCluster.add(e)}createNewCluster(e){this.currentCluster&&!this.format._options.streamable&&this.finalizeCurrentCluster(),this.currentCluster={id:524531317,size:this.format._options.streamable?-1:sr,data:[{id:231,data:e}]},this.writeEBML(this.currentCluster),this.currentClusterMsTimestamp=e,this.trackDatasInCurrentCluster.clear()}finalizeCurrentCluster(){m(this.currentCluster);let e=this.writer.getPos()-this.dataOffsets.get(this.currentCluster),t=this.writer.getPos();this.writer.seek(this.offsets.get(this.currentCluster)+4),this.writeEBMLVarInt(e,sr),this.writer.seek(t);let s=this.offsets.get(this.currentCluster)-this.segmentDataOffset;m(this.cues),this.cues.data.push({id:187,data:[{id:179,data:this.currentClusterMsTimestamp},...[...this.trackDatasInCurrentCluster].map(i=>({id:183,data:[{id:247,data:i.track.id},{id:241,data:s}]}))]})}async onTrackClose(){let e=await this.mutex.acquire();await this.interleaveChunks(),e()}async finalize(){let e=await this.mutex.acquire();this.segment||(this.createTracks(),this.createSegment());for(let t of this.trackDatas)for(;t.chunkQueue.length>0;)this.writeBlock(t,t.chunkQueue.shift());if(!this.format._options.streamable&&this.currentCluster&&this.finalizeCurrentCluster(),m(this.cues),this.writeEBML(this.cues),!this.format._options.streamable){let t=this.writer.getPos(),s=this.writer.getPos()-this.segmentDataOffset;this.writer.seek(this.offsets.get(this.segment)+4),this.writeEBMLVarInt(s,ir),this.segmentDuration.data=new ce(this.duration),this.writer.seek(this.offsets.get(this.segmentDuration)),this.writeEBML(this.segmentDuration),this.seekHead.data[0].data[1].data=this.offsets.get(this.cues)-this.segmentDataOffset,this.seekHead.data[1].data[1].data=this.offsets.get(this.segmentInfo)-this.segmentDataOffset,this.seekHead.data[2].data[1].data=this.offsets.get(this.tracksElement)-this.segmentDataOffset,this.writer.seek(this.offsets.get(this.seekHead)),this.writeEBML(this.seekHead),this.writer.seek(t)}e()}};var W=class{},He=class extends W{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.fastStart!==void 0&&![!1,"in-memory","fragmented"].includes(e.fastStart))throw new TypeError('options.fastStart, when provided, must be false, "in-memory", or "fragmented".');super(),this._options=e}_createMuxer(e){return new Ne(e,this)}},Te=class extends W{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.streamable!==void 0&&typeof e.streamable!="boolean")throw new TypeError("options.streamable, when provided, must be a boolean.");super(),this._options=e}_createMuxer(e){return new We(e,this)}},J=class extends Te{};var ee=class{_connectedTrack=null;_closed=!1;_offsetTimestamps=!1;_ensureValidDigest(){if(!this._connectedTrack)throw new Error("Cannot call digest without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call digest before output has been started.");if(this._connectedTrack.output._finalizing)throw new Error("Cannot call digest after output has started finalizing.");if(this._closed)throw new Error("Cannot call digest after source has been closed.")}_start(){}async _flush(){}close(){if(this._closed)throw new Error("Source already closed.");if(!this._connectedTrack)throw new Error("Cannot call close without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call close before output has been started.");this._closed=!0,!this._connectedTrack.output._finalizing&&this._connectedTrack.output._muxer.onTrackClose(this._connectedTrack)}},z=class extends ee{_connectedTrack=null;_codec;constructor(e){if(super(),!Y.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${Y.join(", ")}.`);this._codec=e}},Le=class extends z{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},Si=5,Ci=r=>{if(!r||typeof r!="object")throw new TypeError("Codec config must be an object.");if(!Y.includes(r.codec))throw new TypeError(`Invalid video codec '${r.codec}'. Must be one of: ${Y.join(", ")}.`);if(!Number.isInteger(r.bitrate)||r.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.");if(r.latencyMode!==void 0&&!["quality","realtime"].includes(r.latencyMode))throw new TypeError("config.latencyMode, when provided, must be 'quality' or 'realtime'.")},xe=class{constructor(e,t){this.source=e;this.codecConfig=t;Ci(t)}encoder=null;muxer=null;lastMultipleOfKeyFrameInterval=-1;lastWidth=null;lastHeight=null;async digest(e){if(this.source._ensureValidDigest(),this.lastWidth!==null&&this.lastHeight!==null){if(e.codedWidth!==this.lastWidth||e.codedHeight!==this.lastHeight)throw new Error(`Video frame size must remain constant. Expected ${this.lastWidth}x${this.lastHeight}, got ${e.codedWidth}x${e.codedHeight}.`)}else this.lastWidth=e.codedWidth,this.lastHeight=e.codedHeight;this.ensureEncoder(e),m(this.encoder);let t=Math.floor(e.timestamp/1e6/Si);this.encoder.encode(e,{keyFrame:t!==this.lastMultipleOfKeyFrameInterval}),this.lastMultipleOfKeyFrameInterval=t,this.encoder.encodeQueueSize>=4&&await new Promise(s=>this.encoder.addEventListener("dequeue",s,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new VideoEncoder({output:(t,s)=>void this.muxer.addEncodedVideoChunk(this.source._connectedTrack,t,s),error:t=>console.error("Video encode error:",t)}),this.encoder.configure({codec:Xt(this.codecConfig.codec,e.codedWidth,e.codedHeight,this.codecConfig.bitrate),width:e.codedWidth,height:e.codedHeight,bitrate:this.codecConfig.bitrate,framerate:this.source._connectedTrack?.metadata.frameRate,latencyMode:this.codecConfig.latencyMode,...Jt(this.codecConfig.codec)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},$e=class extends z{_encoder;constructor(e){super(e.codec),this._encoder=new xe(this,e)}digest(e){if(!(e instanceof VideoFrame))throw new TypeError("videoFrame must be a VideoFrame.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},Qe=class extends z{_encoder;_canvas;constructor(e,t){if(!(e instanceof HTMLCanvasElement))throw new TypeError("canvas must be an HTMLCanvasElement.");super(t.codec),this._encoder=new xe(this,t),this._canvas=e}digest(e,t=0){if(!Number.isFinite(e)||e<0)throw new TypeError("timestamp must be a non-negative number.");if(!Number.isFinite(t)||t<0)throw new TypeError("duration must be a non-negative number.");let s=new VideoFrame(this._canvas,{timestamp:Math.round(1e6*e),duration:Math.round(1e6*t),alpha:"discard"}),i=this._encoder.digest(s);return s.close(),i}_flush(){return this._encoder.flush()}},Ke=class extends z{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="video")throw new TypeError("track must be a video MediaStreamTrack.");t={...t,latencyMode:"realtime"},super(t.codec),this._encoder=new xe(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:s=>{this._encoder.digest(s),s.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(s=>{s instanceof DOMException&&s.name==="AbortError"||console.error("Pipe error:",s)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},P=class extends ee{_connectedTrack=null;_codec;constructor(e){if(super(),!Z.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${Z.join(", ")}.`);this._codec=e}},je=class extends P{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},wi=r=>{if(!r||typeof r!="object")throw new TypeError("Codec config must be an object.");if(!Z.includes(r.codec))throw new TypeError(`Invalid audio codec '${r.codec}'. Must be one of: ${Z.join(", ")}.`);if(!Number.isInteger(r.bitrate)||r.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.")},Se=class{constructor(e,t){this.source=e;this.codecConfig=t;wi(t)}encoder=null;muxer=null;lastNumberOfChannels=null;lastSampleRate=null;async digest(e){if(this.source._ensureValidDigest(),this.lastNumberOfChannels!==null&&this.lastSampleRate!==null){if(e.numberOfChannels!==this.lastNumberOfChannels||e.sampleRate!==this.lastSampleRate)throw new Error(`Audio parameters must remain constant. Expected ${this.lastNumberOfChannels} channels at ${this.lastSampleRate} Hz, got ${e.numberOfChannels} channels at ${e.sampleRate} Hz.`)}else this.lastNumberOfChannels=e.numberOfChannels,this.lastSampleRate=e.sampleRate;this.ensureEncoder(e),m(this.encoder),this.encoder.encode(e),this.encoder.encodeQueueSize>=4&&await new Promise(t=>this.encoder.addEventListener("dequeue",t,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new AudioEncoder({output:(t,s)=>void this.muxer.addEncodedAudioChunk(this.source._connectedTrack,t,s),error:t=>console.error("Audio encode error:",t)}),this.encoder.configure({codec:Yt(this.codecConfig.codec,e.numberOfChannels,e.sampleRate),numberOfChannels:e.numberOfChannels,sampleRate:e.sampleRate,bitrate:this.codecConfig.bitrate,...er(this.codecConfig.codec)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},qe=class extends P{_encoder;constructor(e){super(e.codec),this._encoder=new Se(this,e)}digest(e){if(!(e instanceof AudioData))throw new TypeError("audioData must be an AudioData.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},Xe=class extends P{_encoder;_accumulatedFrameCount=0;constructor(e){super(e.codec),this._encoder=new Se(this,e)}digest(e){if(!(e instanceof AudioBuffer))throw new TypeError("audioBuffer must be an AudioBuffer.");let t=e.numberOfChannels,s=e.sampleRate,i=e.length,a=new Float32Array(t*i);for(let o=0;o<t;o++){let u=e.getChannelData(o);a.set(u,o*i)}let n=new AudioData({format:"f32-planar",sampleRate:s,numberOfFrames:i,numberOfChannels:t,timestamp:Math.round(1e6*this._accumulatedFrameCount/s),data:a}),c=this._encoder.digest(n);return n.close(),this._accumulatedFrameCount+=i,c}_flush(){return this._encoder.flush()}},Ge=class extends P{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="audio")throw new TypeError("track must be an audio MediaStreamTrack.");super(t.codec),this._encoder=new Se(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:s=>{this._encoder.digest(s),s.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(s=>{s instanceof DOMException&&s.name==="AbortError"||console.error("Pipe error:",s)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},te=class extends ee{_connectedTrack=null;_codec;constructor(e){if(super(),!be.includes(e))throw new TypeError(`Invalid subtitle codec '${e}'. Must be one of: ${be.join(", ")}.`);this._codec=e}},Ye=class extends te{_parser;constructor(e){super(e),this._parser=new Ae({codec:e,output:(t,s)=>this._connectedTrack?.output._muxer.addSubtitleCue(this._connectedTrack,t,s),error:t=>console.error("Subtitle parse error:",t)})}digest(e){if(typeof e!="string")throw new TypeError("text must be a string.");return this._ensureValidDigest(),this._parser.parse(e),this._connectedTrack.output._muxer.mutex.currentPromise}};var Ze=class{_muxer;_writer;_tracks=[];_started=!1;_finalizing=!1;_mutex=new U;constructor(e){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(!(e.format instanceof W))throw new TypeError("options.format must be an OutputFormat.");if(!(e.target instanceof N))throw new TypeError("options.target must be a Target.");if(e.target._output)throw new Error("Target is already used for another output.");e.target._output=this,this._writer=e.target._createWriter(),this._muxer=e.format._createMuxer(this)}addVideoTrack(e,t={}){if(!(e instanceof z))throw new TypeError("source must be a VideoSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");if(typeof t.rotation=="number"&&![0,90,180,270].includes(t.rotation))throw new TypeError(`Invalid video rotation: ${t.rotation}. Has to be 0, 90, 180 or 270.`);if(Array.isArray(t.rotation)&&(t.rotation.length!==9||t.rotation.some(s=>!Number.isFinite(s))))throw new TypeError(`Invalid video transformation matrix: ${t.rotation.join()}`);if(t.frameRate!==void 0&&(!Number.isInteger(t.frameRate)||t.frameRate<=0))throw new TypeError(`Invalid video frame rate: ${t.frameRate}. Must be a positive integer.`);this._addTrack("video",e,t)}addAudioTrack(e,t={}){if(!(e instanceof P))throw new TypeError("source must be an AudioSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("audio",e,t)}addSubtitleTrack(e,t={}){if(!(e instanceof te))throw new TypeError("source must be a SubtitleSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("subtitle",e,t)}_addTrack(e,t,s){if(this._started)throw new Error("Cannot add track after output has started.");if(t._connectedTrack)throw new Error("Source is already used for a track.");let i={id:this._tracks.length+1,output:this,type:e,source:t,metadata:s};this._muxer.beforeTrackAdd(i),this._tracks.push(i),t._connectedTrack=i}async start(){if(this._started)throw new Error("Output already started.");this._started=!0,this._writer.start();let e=await this._mutex.acquire();await this._muxer.start();for(let t of this._tracks)t.source._start();e()}async finalize(){if(!this._started)throw new Error("Cannot finalize before starting.");if(this._finalizing)throw new Error("Cannot call finalize twice.");this._finalizing=!0;let e=await this._mutex.acquire(),t=this._tracks.map(s=>s.source._flush());await Promise.all(t),await this._muxer.finalize(),await this._writer.flush(),await this._writer.finalize(),e()}};var ue=class{_sizePromise=null;_getSize(){return this._sizePromise??=this._retrieveSize()}},Je=class extends ue{constructor(t){super();this.buffer=t}async _read(t,s){return new Uint8Array(this.buffer,t,s-t)}async _retrieveSize(){return this.buffer.byteLength}},et=class extends ue{constructor(t){super();this.blob=t}async _read(t,s){let a=await this.blob.slice(t,s).arrayBuffer();return new Uint8Array(a)}async _retrieveSize(){return this.blob.size}};var me=class{input;constructor(e){this.input=e}};var tt=class{_backing;constructor(e){this._backing=e}isVideoTrack(){return this instanceof Ce}isAudioTrack(){return this instanceof we}getDuration(){return this._backing.getDuration()}},Ce=class extends tt{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getWidth(){return this._backing.getWidth()}getHeight(){return this._backing.getHeight()}getRotation(){return this._backing.getRotation()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}},we=class extends tt{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getNumberOfChannels(){return this._backing.getNumberOfChannels()}getSampleRate(){return this._backing.getSampleRate()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}};var de=class{constructor(e,t=1/0){this.source=e;this.maxStorableBytes=t}loadedSegments=[];loadingSegments=[];sourceSizePromise=null;nextAge=0;totalStoredBytes=0;async loadRange(e,t){t=Math.min(t,await this.source._getSize());let s=this.loadingSegments.find(o=>o.start<=e&&o.end>=t);if(s){await s.promise;return}if(this.loadedSegments.some(o=>o.start<=e&&o.end>=t))return;let a=this.source._read(e,t),n={start:e,end:t,promise:a};this.loadingSegments.push(n);let c=await a;Ft(this.loadingSegments,n),this.insertIntoLoadedSegments(e,c)}insertIntoLoadedSegments(e,t){let s={start:e,end:e+t.byteLength,bytes:t,view:new DataView(t.buffer),age:this.nextAge++},i=I(this.loadedSegments,e,a=>a.start);(i===-1||this.loadedSegments[i].start<s.start)&&i++,this.loadedSegments.splice(i,0,s),this.totalStoredBytes+=t.byteLength;for(let a=i+1;a<this.loadedSegments.length;a++){let n=this.loadedSegments[a];if(n.start>=s.end)break;s.start<=n.start&&n.end<=s.end&&(this.loadedSegments.splice(a,1),a--)}for(;this.totalStoredBytes>this.maxStorableBytes&&this.loadedSegments.length>1;){let a=null,n=-1;for(let c=0;c<this.loadedSegments.length;c++){let o=this.loadedSegments[c];(!a||o.age<a.age)&&(a=o,n=c)}m(a),this.totalStoredBytes-=a.bytes.byteLength,this.loadedSegments.splice(n,1)}}getViewAndOffset(e,t){let s=I(this.loadedSegments,e,a=>a.start),i=null;if(s!==-1)for(let a=s;a<this.loadedSegments.length;a++){let n=this.loadedSegments[a];if(n.start>e)break;if(t<=n.end){i=n;break}}if(!i)throw new Error(`No segment loaded for range [${e}, ${t}).`);return i.age=this.nextAge++,{view:i.view,offset:i.bytes.byteOffset+e-i.start}}forgetRange(e,t){if(t<=e)return;let s=I(this.loadedSegments,e,a=>a.start);if(s===-1)return;let i=this.loadedSegments[s];i.start!==e||i.end!==t||(this.loadedSegments.splice(s,1),this.totalStoredBytes-=i.bytes.byteLength)}};var re=class{constructor(e){this.reader=e}pos=0;readRange(e,t){let{view:s,offset:i}=this.reader.getViewAndOffset(e,t);return new Uint8Array(s.buffer,i,t-e)}readU8(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+1);return this.pos++,e.getUint8(t)}readU16(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+2);return this.pos+=2,e.getUint16(t,!1)}readU24(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+3);this.pos+=3;let s=e.getUint16(t,!1),i=e.getUint8(t+2);return s*256+i}readS32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getUint32(t,!1)}readI32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU64(){let e=this.readU32(),t=this.readU32();return e*4294967296+t}readF64(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+8);return this.pos+=8,e.getFloat64(t,!1)}readFixed_16_16(){return this.readS32()/65536}readFixed_2_30(){return this.readS32()/1073741824}readAscii(e){let{view:t,offset:s}=this.reader.getViewAndOffset(this.pos,this.pos+e);this.pos+=e;let i="";for(let a=0;a<e;a++)i+=String.fromCharCode(t.getUint8(s+a));return i}readIsomVariableInteger(){let e=0;for(let t=0;t<4;t++){e<<=7;let s=this.readU8();if(e|=s&127,!(s&128))break}return e}readBoxHeader(){let e=this.readU32(),t=this.readAscii(4),s=8;return e===1&&(e=this.readU64(),s=16),{name:t,totalSize:e,headerSize:s,contentSize:e-s}}};var yi=[B(0),B(90),B(180),B(270)],rt=class extends me{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new U;chunkReader;constructor(e){super(e),this.isobmffReader=new re(e._mainReader),this.chunkReader=new re(new de(e._source,64*2**20))}async getDuration(){if(await this.readMetadata(),this.movieDurationInTimescale===-1)throw new Error("Could not read movie duration.");return this.movieDurationInTimescale/this.movieTimescale}async getTracks(){return await this.readMetadata(),this.tracks.map(e=>e.inputTrack)}async getMimeType(){await this.readMetadata();let e="video/mp4";if(this.tracks.length>0){let t=await Promise.all(this.tracks.map(i=>i.inputTrack.getCodecMimeType())),s=[...new Set(t)];e+=`; codecs="${s.join(", ")}"`}return e}readMetadata(){return this.metadataPromise??=(async()=>{let e=await this.isobmffReader.reader.source._getSize();for(;this.isobmffReader.pos<e;){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.pos,s=this.isobmffReader.readBoxHeader();if(s.name==="moov"){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+s.contentSize),this.readContiguousBoxes(s.contentSize);break}this.isobmffReader.pos=t+s.totalSize}if(this.isFragmented){await this.isobmffReader.reader.loadRange(e-4,e),this.isobmffReader.pos=e-4;let t=this.isobmffReader.readU32(),s=e-t;if(s>=0&&s<e){await this.isobmffReader.reader.loadRange(s,e),this.isobmffReader.pos=s;let i=this.isobmffReader.readBoxHeader();i.name==="mfra"&&this.readContiguousBoxes(i.contentSize)}}})()}getSampleTableForTrack(e){if(e.sampleTable)return e.sampleTable;let t={sampleTimingEntries:[],sampleCompositionTimeOffsets:[],sampleSizes:[],keySampleIndices:null,chunkOffsets:[],sampleToChunk:[],presentationTimestamps:[]};e.sampleTable=t,this.isobmffReader.pos=e.sampleTableOffset,this.currentTrack=e,this.traverseBox(),this.currentTrack=null;for(let s of t.sampleTimingEntries)for(let i=0;i<s.count;i++)t.presentationTimestamps.push({presentationTimestamp:s.startDecodeTimestamp+i*s.delta,sampleIndex:s.startIndex+i});for(let s of t.sampleCompositionTimeOffsets)for(let i=0;i<s.count;i++){let a=s.startIndex+i,n=t.presentationTimestamps[a];n&&(n.presentationTimestamp+=s.offset)}return t.presentationTimestamps.sort((s,i)=>s.presentationTimestamp-i.presentationTimestamp),e.sampleTable}async readFragment(){let e=this.isobmffReader.pos;await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.readBoxHeader();m(t.name==="moof"),await this.isobmffReader.reader.loadRange(e,e+t.totalSize),this.isobmffReader.pos=e,this.traverseBox();let s=D(this.fragments,e,a=>a.moofOffset);m(s!==-1);let i=this.fragments[s];m(i.moofOffset===e),this.isobmffReader.reader.forgetRange(e,e+t.totalSize);for(let[a,n]of i.trackData){if(n.startTimestampIsFinal)continue;let c=this.tracks.find(l=>l.id===a);this.isobmffReader.pos=0;let o=null,u=null,d=I(c.fragments,e-1,l=>l.moofOffset);for(d!==-1&&(o=c.fragments[d],u=o,this.isobmffReader.pos=o.moofOffset+o.moofSize);this.isobmffReader.pos<e;){if(o?.nextFragment)o=o.nextFragment,this.isobmffReader.pos=o.moofOffset+o.moofSize;else{await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let l=this.isobmffReader.pos,g=this.isobmffReader.readBoxHeader();if(g.name==="moof"){let h=D(this.fragments,l,b=>b.moofOffset);if(h===-1){this.isobmffReader.pos=l;let b=await this.readFragment();o&&(o.nextFragment=b),o=b}else{let b=this.fragments[h];o&&(o.nextFragment=b),o=b}}this.isobmffReader.pos=l+g.totalSize}o&&o.trackData.has(a)&&(u=o)}if(u){let l=u.trackData.get(a);m(l.startTimestampIsFinal),nr(n,l.endTimestamp)}n.startTimestampIsFinal=!0}return i}readContiguousBoxes(e){let t=this.isobmffReader.pos;for(;this.isobmffReader.pos-t<e;)this.traverseBox()}traverseBox(){let e=this.isobmffReader.pos,t=this.isobmffReader.readBoxHeader(),s=e+t.totalSize;switch(t.name){case"mdia":case"minf":case"dinf":case"mfra":this.readContiguousBoxes(t.contentSize);break;case"mvhd":{let i=this.isobmffReader.readU8();this.isobmffReader.pos+=3,i===1?(this.isobmffReader.pos+=16,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU64()):(this.isobmffReader.pos+=8,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU32())}break;case"trak":{let i={id:-1,demuxer:this,inputTrack:null,info:null,timescale:-1,durationInTimescale:-1,rotation:0,sampleTableOffset:-1,sampleTable:null,fragmentLookupTable:null,currentFragmentState:null,fragments:[]};if(this.currentTrack=i,this.readContiguousBoxes(t.contentSize),i.id!==-1&&i.timescale!==-1&&i.info!==null){if(i.info.type==="video"&&i.info.codec!==null){let a=i;i.inputTrack=new Ce(new Ct(a)),this.tracks.push(i)}else if(i.info.type==="audio"&&i.info.codec!==null){let a=i;i.inputTrack=new we(new wt(a)),this.tracks.push(i)}}this.currentTrack=null}break;case"tkhd":{let i=this.currentTrack;m(i);let a=this.isobmffReader.readU8();if(!((this.isobmffReader.readU24()&1)!==0))break;if(a===0)this.isobmffReader.pos+=8,i.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=8;else if(a===1)this.isobmffReader.pos+=16,i.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=12;else throw new Error(`Incorrect track header version ${a}.`);this.isobmffReader.pos+=2*4+2+2+2+2;let o=[];o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16()),this.isobmffReader.pos+=4,o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16());let u=yi.findIndex(d=>d.every((l,g)=>l===o[g]));u===-1?i.rotation=0:i.rotation=90*u}break;case"mdhd":{let i=this.currentTrack;m(i);let a=this.isobmffReader.readU8();this.isobmffReader.pos+=3,a===0?(this.isobmffReader.pos+=8,i.timescale=this.isobmffReader.readU32(),i.durationInTimescale=this.isobmffReader.readU32()):a===1&&(this.isobmffReader.pos+=16,i.timescale=this.isobmffReader.readU32(),i.durationInTimescale=this.isobmffReader.readU64())}break;case"hdlr":{let i=this.currentTrack;m(i),this.isobmffReader.pos+=8;let a=this.isobmffReader.readAscii(4);a==="vide"?i.info={type:"video",width:-1,height:-1,codec:null,codecDescription:null,colorSpace:null}:a==="soun"&&(i.info={type:"audio",numberOfChannels:-1,sampleRate:-1,codec:null,codecDescription:null})}break;case"stbl":{let i=this.currentTrack;m(i),i.sampleTableOffset=e,this.readContiguousBoxes(t.contentSize)}break;case"stsd":{let i=this.currentTrack;if(m(i),i.info===null||i.sampleTable)break;let a=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=this.isobmffReader.readU32();for(let c=0;c<n;c++){let o=this.isobmffReader.readBoxHeader();if(i.info.type==="video"){if(o.name==="avc1")i.info.codec="avc";else if(o.name==="hvc1"||o.name==="hev1")i.info.codec="hevc";else{console.warn(`Unsupported video sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2+2+2+3*4,i.info.width=this.isobmffReader.readU16(),i.info.height=this.isobmffReader.readU16(),this.isobmffReader.pos+=50,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}else{if(o.name==="mp4a")i.info.codec="aac";else if(o.name.toLowerCase()==="opus")i.info.codec="opus";else{console.warn(`Unsupported audio sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2;let u=this.isobmffReader.readU16();this.isobmffReader.pos+=3*2;let d=this.isobmffReader.readU16();this.isobmffReader.pos+=6;let l=this.isobmffReader.readU32()/65536;if(a===0&&u>0){if(u===1)this.isobmffReader.pos+=4*4;else if(u===2){this.isobmffReader.pos+=4,l=this.isobmffReader.readF64(),d=this.isobmffReader.readU32(),this.isobmffReader.pos+=4;let g=this.isobmffReader.readU32(),h=this.isobmffReader.readU32(),b=this.isobmffReader.readU32(),p=this.isobmffReader.readU32()}}i.info.numberOfChannels=d,i.info.sampleRate=l,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}}}break;case"avcC":{let i=this.currentTrack;m(i&&i.info),i.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"hvcC":{let i=this.currentTrack;m(i&&i.info),i.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"colr":{let i=this.currentTrack;if(m(i&&i.info?.type==="video"),this.isobmffReader.readAscii(4)!=="nclx")break;let n=this.isobmffReader.readU16(),c=this.isobmffReader.readU16(),o=this.isobmffReader.readU16(),u=!!(this.isobmffReader.readU8()&128);i.info.colorSpace={primaries:Rt[n],transfer:At[c],matrix:Ot[o],fullRange:u}}break;case"wave":t.totalSize>8&&this.readContiguousBoxes(t.contentSize);break;case"esds":{let i=this.currentTrack;m(i&&i.info),this.isobmffReader.pos+=4;let a=this.isobmffReader.readU8();m(a===3),this.isobmffReader.readIsomVariableInteger(),this.isobmffReader.pos+=2;let n=this.isobmffReader.readU8(),c=(n&128)!==0,o=(n&64)!==0,u=(n&32)!==0;if(c&&(this.isobmffReader.pos+=2),o){let b=this.isobmffReader.readU8();this.isobmffReader.pos+=b}u&&(this.isobmffReader.pos+=2);let d=this.isobmffReader.readU8();m(d===4),this.isobmffReader.readIsomVariableInteger();let l=this.isobmffReader.readU8();m(l===64),this.isobmffReader.pos+=12;let g=this.isobmffReader.readU8();m(g===5);let h=this.isobmffReader.readIsomVariableInteger();i.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+h)}break;case"stts":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32(),n=0,c=0;for(let o=0;o<a;o++){let u=this.isobmffReader.readU32(),d=this.isobmffReader.readU32();i.sampleTable.sampleTimingEntries.push({startIndex:n,startDecodeTimestamp:c,count:u,delta:d}),n+=u,c+=u*d}}break;case"ctts":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32(),n=0;for(let c=0;c<a;c++){let o=this.isobmffReader.readU32(),u=this.isobmffReader.readI32();i.sampleTable.sampleCompositionTimeOffsets.push({startIndex:n,count:o,offset:u}),n+=o}}break;case"stsz":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32(),n=this.isobmffReader.readU32();if(a===0)for(let c=0;c<n;c++){let o=this.isobmffReader.readU32();i.sampleTable.sampleSizes.push(o)}else i.sampleTable.sampleSizes.push(a)}break;case"stz2":throw new Error("Unsupported.");case"stss":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4,i.sampleTable.keySampleIndices=[];let a=this.isobmffReader.readU32();for(let n=0;n<a;n++){let c=this.isobmffReader.readU32()-1;i.sampleTable.keySampleIndices.push(c)}}break;case"stsc":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32();for(let c=0;c<a;c++){let o=this.isobmffReader.readU32()-1,u=this.isobmffReader.readU32(),d=this.isobmffReader.readU32();i.sampleTable.sampleToChunk.push({startSampleIndex:-1,startChunkIndex:o,samplesPerChunk:u,sampleDescriptionIndex:d})}let n=0;for(let c=0;c<i.sampleTable.sampleToChunk.length;c++)if(i.sampleTable.sampleToChunk[c].startSampleIndex=n,c<i.sampleTable.sampleToChunk.length-1){let u=i.sampleTable.sampleToChunk[c+1].startChunkIndex-i.sampleTable.sampleToChunk[c].startChunkIndex;n+=u*i.sampleTable.sampleToChunk[c].samplesPerChunk}}break;case"stco":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32();for(let n=0;n<a;n++){let c=this.isobmffReader.readU32();i.sampleTable.chunkOffsets.push(c)}}break;case"co64":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32();for(let n=0;n<a;n++){let c=this.isobmffReader.readU64();i.sampleTable.chunkOffsets.push(c)}}break;case"mvex":this.isFragmented=!0,this.readContiguousBoxes(t.contentSize);break;case"mehd":{let i=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=i===1?this.isobmffReader.readU64():this.isobmffReader.readU32();this.movieDurationInTimescale=a}break;case"trex":{this.isobmffReader.pos+=4;let i=this.isobmffReader.readU32(),a=this.isobmffReader.readU32(),n=this.isobmffReader.readU32(),c=this.isobmffReader.readU32(),o=this.isobmffReader.readU32();this.fragmentTrackDefaults.push({trackId:i,defaultSampleDescriptionIndex:a,defaultSampleDuration:n,defaultSampleSize:c,defaultSampleFlags:o})}break;case"tfra":{let i=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=this.isobmffReader.readU32(),n=this.tracks.find(w=>w.id===a);if(!n)break;n.fragmentLookupTable=[];let c=this.isobmffReader.readU32(),o=(c&48)>>4,u=(c&12)>>2,d=c&3,l=this.isobmffReader,g=[l.readU8.bind(l),l.readU16.bind(l),l.readU24.bind(l),l.readU32.bind(l)],h=g[o],b=g[u],p=g[d],x=this.isobmffReader.readU32();for(let w=0;w<x;w++){let y=i===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),H=i===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),ie=h(),V=b(),A=p();n.fragmentLookupTable.push({timestamp:y,moofOffset:H})}}break;case"moof":{this.currentFragment={moofOffset:e,moofSize:t.totalSize,implicitBaseDataOffset:e,trackData:new Map,dataStart:1/0,dataEnd:0,nextFragment:null},this.readContiguousBoxes(t.contentSize);let i=I(this.fragments,this.currentFragment.moofOffset,a=>a.moofOffset);this.fragments.splice(i+1,0,this.currentFragment);for(let[,a]of this.currentFragment.trackData){let n=a.samples[0],c=_(a.samples);this.currentFragment.dataStart=Math.min(this.currentFragment.dataStart,n.byteOffset),this.currentFragment.dataEnd=Math.max(this.currentFragment.dataEnd,c.byteOffset+c.byteSize)}this.currentFragment=null}break;case"traf":if(m(this.currentFragment),this.readContiguousBoxes(t.contentSize),this.currentTrack){let i=this.currentFragment.trackData.get(this.currentTrack.id);if(i){let a=I(this.currentTrack.fragments,this.currentFragment.moofOffset,c=>c.moofOffset);this.currentTrack.fragments.splice(a+1,0,this.currentFragment);let{currentFragmentState:n}=this.currentTrack;m(n),n.startTimestamp!==null&&(nr(i,n.startTimestamp),i.startTimestampIsFinal=!0)}this.currentTrack.currentFragmentState=null,this.currentTrack=null}break;case"tfhd":{m(this.currentFragment),this.isobmffReader.pos+=1;let i=this.isobmffReader.readU24(),a=!!(i&1),n=!!(i&2),c=!!(i&8),o=!!(i&16),u=!!(i&32),d=!!(i&65536),l=!!(i&131072),g=this.isobmffReader.readU32(),h=this.tracks.find(p=>p.id===g);if(!h)break;let b=this.fragmentTrackDefaults.find(p=>p.trackId===g);this.currentTrack=h,h.currentFragmentState={baseDataOffset:this.currentFragment.implicitBaseDataOffset,sampleDescriptionIndex:b?.defaultSampleDescriptionIndex??null,defaultSampleDuration:b?.defaultSampleDuration??null,defaultSampleSize:b?.defaultSampleSize??null,defaultSampleFlags:b?.defaultSampleFlags??null,startTimestamp:null},a?h.currentFragmentState.baseDataOffset=this.isobmffReader.readU64():l&&(h.currentFragmentState.baseDataOffset=this.currentFragment.moofOffset),n&&(h.currentFragmentState.sampleDescriptionIndex=this.isobmffReader.readU32()),c&&(h.currentFragmentState.defaultSampleDuration=this.isobmffReader.readU32()),o&&(h.currentFragmentState.defaultSampleSize=this.isobmffReader.readU32()),u&&(h.currentFragmentState.defaultSampleFlags=this.isobmffReader.readU32()),d&&(h.currentFragmentState.defaultSampleDuration=0)}break;case"tfdt":{let i=this.currentTrack;if(!i)break;m(i.currentFragmentState);let a=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=a===0?this.isobmffReader.readU32():this.isobmffReader.readU64();i.currentFragmentState.startTimestamp=n}break;case"trun":{let i=this.currentTrack;if(!i)break;if(m(this.currentFragment),m(i.currentFragmentState),this.currentFragment.trackData.has(i.id))throw new Error("Can't have two trun boxes for the same track in one fragment.");let a=this.isobmffReader.readU8(),n=this.isobmffReader.readU24(),c=!!(n&1),o=!!(n&4),u=!!(n&256),d=!!(n&512),l=!!(n&1024),g=!!(n&2048),h=this.isobmffReader.readU32(),b=i.currentFragmentState.baseDataOffset;c&&(b+=this.isobmffReader.readI32());let p=null;o&&(p=this.isobmffReader.readU32());let x=b;if(h===0){this.currentFragment.implicitBaseDataOffset=x;break}let w=0,y={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(i.id,y);for(let V=0;V<h;V++){let A;u?A=this.isobmffReader.readU32():(m(i.currentFragmentState.defaultSampleDuration!==null),A=i.currentFragmentState.defaultSampleDuration);let Ie;d?Ie=this.isobmffReader.readU32():(m(i.currentFragmentState.defaultSampleSize!==null),Ie=i.currentFragmentState.defaultSampleSize);let _e;l?_e=this.isobmffReader.readU32():(m(i.currentFragmentState.defaultSampleFlags!==null),_e=i.currentFragmentState.defaultSampleFlags),V===0&&p!==null&&(_e=p);let ut=0;g&&(a===0?ut=this.isobmffReader.readU32():ut=this.isobmffReader.readI32());let dr=!(_e&65536);y.samples.push({presentationTimestamp:w+ut,duration:A,byteOffset:x,byteSize:Ie,isKeyFrame:dr}),x+=Ie,w+=A}y.presentationTimestamps=y.samples.map((V,A)=>({presentationTimestamp:V.presentationTimestamp,sampleIndex:A})).sort((V,A)=>V.presentationTimestamp-A.presentationTimestamp);let H=y.samples[y.presentationTimestamps[0].sampleIndex],ie=y.samples[_(y.presentationTimestamps).sampleIndex];y.startTimestamp=H.presentationTimestamp,y.endTimestamp=ie.presentationTimestamp+ie.duration,this.currentFragment.implicitBaseDataOffset=x}break}this.isobmffReader.pos=s}},it=class{constructor(e){this.internalTrack=e}chunkToSampleIndex=new WeakMap;sampleIndexToChunk=new Map;chunkToFragmentLocation=new WeakMap;fragmentLocationToChunk=new Map;getCodec(){throw new Error("Not implemented on base class.")}async getDuration(){return this.internalTrack.durationInTimescale/this.internalTrack.timescale}},Ct=class extends it{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getWidth(){return this.internalTrack.info.width}async getHeight(){return this.internalTrack.info.height}async getRotation(){return this.internalTrack.rotation}async getDecoderConfig(){return{codec:Gt(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),codedWidth:this.internalTrack.info.width,codedHeight:this.internalTrack.info.height,description:this.internalTrack.info.codecDescription??void 0,colorSpace:this.internalTrack.info.colorSpace??void 0}}async getFirstChunk(){return this.internalTrack.demuxer.isFragmented?this.performFragmentedLookup(()=>{let e=this.internalTrack.fragments[0];return{fragmentIndex:e?0:-1,sampleIndex:e?0:-1,correctSampleFound:!!e}},0,1/0):this.fetchChunkForSampleIndex(0)}async getChunk(e){let t=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findSampleInFragmentsForTimestamp(t),t,t);{let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=ar(s,t);return this.fetchChunkForSampleIndex(i)}}async getNextChunk(e){if(this.internalTrack.demuxer.isFragmented){let s=this.chunkToFragmentLocation.get(e);if(s===void 0)throw new Error("Chunk was not created from this track.");let i=s.fragment.trackData.get(this.internalTrack.id),a=i.samples[s.sampleIndex],n=D(this.internalTrack.fragments,s.fragment.moofOffset,c=>c.moofOffset);return m(n!==-1),this.performFragmentedLookup(()=>{if(s.sampleIndex+1<i.samples.length)return{fragmentIndex:n,sampleIndex:s.sampleIndex+1,correctSampleFound:!0};{let c=s.fragment;for(;c.nextFragment;)if(c=c.nextFragment,c.trackData.get(this.internalTrack.id)){let u=D(this.internalTrack.fragments,c.moofOffset,d=>d.moofOffset);return m(u!==-1),{fragmentIndex:u,sampleIndex:0,correctSampleFound:!0}}return{fragmentIndex:n,sampleIndex:-1,correctSampleFound:!1}}},a.presentationTimestamp,1/0)}let t=this.chunkToSampleIndex.get(e);if(t===void 0)throw new Error("Chunk was not created from this track.");return this.fetchChunkForSampleIndex(t+1)}async getKeyChunk(e){let t=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findKeySampleInFragmentsForTimestamp(t),t,t);let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=ar(s,t),a=i===-1?-1:Ii(s,i);return this.fetchChunkForSampleIndex(a)}async getNextKeyChunk(e){if(this.internalTrack.demuxer.isFragmented){let a=this.chunkToFragmentLocation.get(e);if(a===void 0)throw new Error("Chunk was not created from this track.");let n=a.fragment.trackData.get(this.internalTrack.id),c=n.samples[a.sampleIndex],o=D(this.internalTrack.fragments,a.fragment.moofOffset,u=>u.moofOffset);return m(o!==-1),this.performFragmentedLookup(()=>{let u=n.samples.findIndex((d,l)=>d.isKeyFrame&&l>a.sampleIndex);if(u!==-1)return{fragmentIndex:o,sampleIndex:u,correctSampleFound:!0};{let d=a.fragment;for(;d.nextFragment;){d=d.nextFragment;let l=d.trackData.get(this.internalTrack.id);if(l){let g=D(this.internalTrack.fragments,d.moofOffset,b=>b.moofOffset);m(g!==-1);let h=l.samples.findIndex(b=>b.isKeyFrame);if(h===-1)throw new Error("Not supported: Fragment does not contain key sample.");return{fragmentIndex:g,sampleIndex:h,correctSampleFound:!0}}}return{fragmentIndex:o,sampleIndex:-1,correctSampleFound:!1}}},c.presentationTimestamp,1/0)}let t=this.chunkToSampleIndex.get(e);if(t===void 0)throw new Error("Chunk was not created from this track.");let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=_i(s,t);return this.fetchChunkForSampleIndex(i)}async fetchChunkForSampleIndex(e){if(e===-1)return null;let t=this.sampleIndexToChunk.get(e)?.deref();if(t)return t;let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=vi(s,e);if(!i)return null;await this.internalTrack.demuxer.chunkReader.reader.loadRange(i.chunkOffset,i.chunkOffset+i.chunkSize);let a=this.internalTrack.demuxer.chunkReader.readRange(i.sampleOffset,i.sampleOffset+i.sampleSize),n=new EncodedVideoChunk({data:a,timestamp:1e6*i.presentationTimestamp/this.internalTrack.timescale,duration:1e6*i.duration/this.internalTrack.timescale,type:i.isKeyFrame?"key":"delta"});return this.chunkToSampleIndex.set(n,e),this.sampleIndexToChunk.set(e,new WeakRef(n)),n}async fetchChunkInFragment(e,t){if(t===-1)return null;let s=`${e.moofOffset}:${t}`,i=this.fragmentLocationToChunk.get(s)?.deref();if(i)return i;let n=e.trackData.get(this.internalTrack.id).samples[t];m(n),await this.internalTrack.demuxer.chunkReader.reader.loadRange(e.dataStart,e.dataEnd);let c=this.internalTrack.demuxer.chunkReader.readRange(n.byteOffset,n.byteOffset+n.byteSize),o=new EncodedVideoChunk({data:c,timestamp:1e6*n.presentationTimestamp/this.internalTrack.timescale,duration:1e6*n.duration/this.internalTrack.timescale,type:n.isKeyFrame?"key":"delta"});return this.chunkToFragmentLocation.set(o,{fragment:e,sampleIndex:t}),this.fragmentLocationToChunk.set(s,new WeakRef(o)),o}findSampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,a=>a.trackData.get(this.internalTrack.id).startTimestamp),s=-1,i=!1;if(t!==-1){let n=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=I(n.presentationTimestamps,e,o=>o.presentationTimestamp);m(c!==-1),s=n.presentationTimestamps[c].sampleIndex,i=e<n.endTimestamp}return{fragmentIndex:t,sampleIndex:s,correctSampleFound:i}}findKeySampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,a=>a.trackData.get(this.internalTrack.id).startTimestamp),s=-1,i=!1;if(t!==-1){let n=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=n.presentationTimestamps.findLastIndex(u=>n.samples[u.sampleIndex].isKeyFrame);if(c===-1)throw new Error("Not supported: Fragment does not contain key sample.");s=n.presentationTimestamps[c].sampleIndex,i=e<n.endTimestamp}return{fragmentIndex:t,sampleIndex:s,correctSampleFound:i}}async performFragmentedLookup(e,t,s){let{fragmentIndex:i,sampleIndex:a,correctSampleFound:n}=e();if(n){let u=this.internalTrack.fragments[i];return this.fetchChunkInFragment(u,a)}let c=this.internalTrack.demuxer,o=await c.fragmentLookupMutex.acquire();try{let u=c.isobmffReader,d=await u.reader.source._getSize(),l=null,g=i,h=a,b=null;if(this.internalTrack.fragmentLookupTable){let p=I(this.internalTrack.fragmentLookupTable,t,x=>x.timestamp);p!==-1&&(b=this.internalTrack.fragmentLookupTable[p])}if(i===-1)u.pos=b?.moofOffset??0;else{let p=this.internalTrack.fragments[i];!b||p.moofOffset>=p.moofOffset?(u.pos=p.moofOffset+p.moofSize,l=p):u.pos=b.moofOffset}for(;u.pos<d;){if(l){let w=l.trackData.get(this.internalTrack.id);if(w&&w.startTimestamp>s)break;if(l.nextFragment){u.pos=l.nextFragment.moofOffset+l.nextFragment.moofSize,l=l.nextFragment;continue}}await u.reader.loadRange(u.pos,u.pos+16);let p=u.pos,x=u.readBoxHeader();if(x.name==="moof"){let w=D(c.fragments,p,y=>y.moofOffset);if(w===-1){u.pos=p;let y=await c.readFragment();l&&(l.nextFragment=y),l=y;let{fragmentIndex:H,sampleIndex:ie,correctSampleFound:V}=e();if(V){let A=this.internalTrack.fragments[H];return this.fetchChunkInFragment(A,ie)}H!==-1&&(g=H,h=ie)}else{let y=c.fragments[w];l&&(l.nextFragment=y),l=y}}u.pos=p+x.totalSize}if(g!==-1){let p=this.internalTrack.fragments[g];return this.fetchChunkInFragment(p,h)}return null}finally{o()}}},wt=class extends it{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getNumberOfChannels(){return this.internalTrack.info.numberOfChannels}async getSampleRate(){return this.internalTrack.info.sampleRate}async getDecoderConfig(){return{codec:Zt(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),numberOfChannels:this.internalTrack.info.numberOfChannels,sampleRate:this.internalTrack.info.sampleRate,description:this.internalTrack.info.codecDescription??void 0}}},ar=(r,e)=>{let t=I(r.presentationTimestamps,e,s=>s.presentationTimestamp);return t===-1?-1:r.presentationTimestamps[t].sampleIndex},vi=(r,e)=>{let t=I(r.sampleTimingEntries,e,p=>p.startIndex),s=r.sampleTimingEntries[t];if(!s||s.startIndex+s.count<=e)return null;let a=s.startDecodeTimestamp+(e-s.startIndex)*s.delta,n=I(r.sampleCompositionTimeOffsets,e,p=>p.startIndex),c=r.sampleCompositionTimeOffsets[n];c&&(a+=c.offset);let o=r.sampleSizes[Math.min(e,r.sampleSizes.length-1)],u=I(r.sampleToChunk,e,p=>p.startSampleIndex),d=r.sampleToChunk[u];m(d);let l=d.startChunkIndex+Math.floor((e-d.startSampleIndex)/d.samplesPerChunk),g=r.chunkOffsets[l],h=0,b=g;if(r.sampleSizes.length===1)b+=o*(e-d.startSampleIndex),h+=o*d.samplesPerChunk;else{let p=d.startSampleIndex+(l-d.startChunkIndex)*d.samplesPerChunk;for(let x=p;x<p+d.samplesPerChunk;x++){let w=r.sampleSizes[x];x<e&&(b+=w),h+=w}}return{presentationTimestamp:a,duration:s.delta,sampleOffset:b,sampleSize:o,chunkOffset:g,chunkSize:h,isKeyFrame:r.keySampleIndices?D(r.keySampleIndices,e,p=>p)!==-1:!0}},Ii=(r,e)=>{if(!r.keySampleIndices)return e;let t=I(r.keySampleIndices,e,s=>s);return r.keySampleIndices[t]??-1},_i=(r,e)=>{if(!r.keySampleIndices)return e+1;let t=I(r.keySampleIndices,e,s=>s);return r.keySampleIndices[t+1]??-1},nr=(r,e)=>{r.startTimestamp+=e,r.endTimestamp+=e;for(let t of r.samples)t.presentationTimestamp+=e;for(let t of r.presentationTimestamps)t.presentationTimestamp+=e};var st=class extends me{};var at=class{},yt=class extends at{async _canReadInput(e){if(await e._mainReader.source._getSize()<8)return!1;let s=new re(e._mainReader);return s.pos=4,s.readAscii(4)==="ftyp"}_createDemuxer(e){return new rt(e)}},vt=class extends at{async _canReadInput(){return!1}_createDemuxer(e){return new st(e)}},ye=new yt,or=ye,cr=ye,nt=new vt,It=nt,ur=nt,mr=[ye,It];var ot=class{_source;_formats;_mainReader;_demuxerPromise=null;_format=null;constructor(e){this._formats=e.formats,this._source=e.source,this._mainReader=new de(e.source)}_getDemuxer(){return this._demuxerPromise??=(async()=>{await this._mainReader.loadRange(0,4096);for(let e of this._formats)if(await e._canReadInput(this))return this._format=e,e._createDemuxer(this);throw new Error("Input has an unrecognizable format.")})()}async getFormat(){return await this._getDemuxer(),m(this._format),this._format}async getDuration(){return(await this._getDemuxer()).getDuration()}async getTracks(){return(await this._getDemuxer()).getTracks()}async getVideoTracks(){return(await this.getTracks()).filter(t=>t.isVideoTrack())}async getPrimaryVideoTrack(){return(await this.getTracks()).find(t=>t.isVideoTrack())??null}async getAudioTracks(){return(await this.getTracks()).filter(t=>t.isAudioTrack())}async getPrimaryAudioTrack(){return(await this.getTracks()).find(t=>t.isAudioTrack())??null}async getMimeType(){return(await this._getDemuxer()).getMimeType()}};var ve=class{constructor(e){this.videoTrack=e}getFirstChunk(){return this.videoTrack._backing.getFirstChunk()}getChunk(e){return this.videoTrack._backing.getChunk(e)}getNextChunk(e){return this.videoTrack._backing.getNextChunk(e)}getKeyChunk(e){return this.videoTrack._backing.getKeyChunk(e)}getNextKeyChunk(e){return this.videoTrack._backing.getNextKeyChunk(e)}async*chunks(e,t=1/0){let s=[],{promise:i,resolve:a}=X(),{promise:n,resolve:c}=X(),o=!1,u=[],d=()=>Math.max(2,u.length);(async()=>{let l=e??await this.getFirstChunk();for(;l&&!o&&!(l.timestamp/1e6>=t);){if(s.length>d()){({promise:n,resolve:c}=X()),await n;continue}s.push(l),a(),{promise:i,resolve:a}=X(),l=await this.getNextChunk(l)}o=!0,a()})();try{for(;;)if(s.length>0){yield s.shift();let l=performance.now();for(u.push(l);u.length>0&&l-u[0]>=1e3;)u.shift();c()}else if(!o)await i;else break}finally{o=!0,c()}}},ct=class{constructor(e){this.videoTrack=e}decoderConfig=null;async createDecoder(e){this.decoderConfig||(this.decoderConfig=await this.videoTrack.getDecoderConfig());let t=new VideoDecoder({output:e,error:s=>console.error(s)});return t.configure(this.decoderConfig),t}async getKeyFrame(e){let t=null,s=await this.createDecoder(a=>t=a),i=await this.videoTrack._backing.getKeyChunk(e);return i?(s.decode(i),await s.flush(),s.close(),t):null}async getFrame(e){let t=null,s=await this.createDecoder(c=>{c.timestamp/1e6<=e?(t?.close(),t=c):c.close()}),i=await this.videoTrack._backing.getKeyChunk(e);if(!i)return null;let a=await this.videoTrack._backing.getChunk(e);m(a),s.decode(i);let n=i;for(;n!==a;){let c=await this.videoTrack._backing.getNextChunk(n);m(c),n=c,s.decode(c),s.decodeQueueSize>=10&&await new Promise(o=>s.addEventListener("dequeue",o,{once:!0}))}return await s.flush(),s.close(),t}async*frames(e=0,t=1/0){let s=[],i=!1,a=null,{promise:n,resolve:c}=X(),o=!1,u=await this.createDecoder(g=>{let h=g.timestamp/1e6;if(h>=t&&(o=!0),o){g.close();return}a&&(h>e?(s.push(a),i=!0):a.close()),h>=e&&(s.push(g),i=!0),a=i?null:g,s.length>0&&(c(),{promise:n,resolve:c}=X())}),d=await this.videoTrack._backing.getKeyChunk(e)??await this.videoTrack._backing.getFirstChunk();if(!d)return;let l=!1;(async()=>{let g=d,h=1/0;if(t<1/0){let x=await this.videoTrack._backing.getChunk(t),w=x?x.type==="key"&&x.timestamp/1e6===t?x:await this.videoTrack._backing.getNextKeyChunk(x):null;w&&(h=w.timestamp/1e6)}let p=new ve(this.videoTrack).chunks(d,h);for(await p.next();g&&!o;){u.decode(g),u.decodeQueueSize>=10&&await new Promise(w=>u.addEventListener("dequeue",w,{once:!0}));let x=await p.next();if(x.done)break;g=x.value}await p.return(),await u.flush(),u.close(),!i&&a&&s.push(a),l=!0,c()})();try{for(;;)if(s.length>0)yield s.shift();else if(!l)await n;else break}finally{o=!0}}};return gr(Ri);})();
+${t.notes??""}`,l=this.createInternalChunk(u,a,t.duration,"key",m.trim()?M.encode(m):null);n.chunkQueue.push(l),await this.interleaveChunks()}finally{s()}}async interleaveChunks(){for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let s of this.trackDatas){if(s.chunkQueue.length===0&&!s.track.source._closed)break e;s.chunkQueue.length>0&&s.chunkQueue[0].timestamp<t&&(e=s,t=s.chunkQueue[0].timestamp)}if(!e)break;let r=e.chunkQueue.shift();this.writeBlock(e,r)}await this.writer.flush()}fixVP9ColorSpace(e,t){if(t.type!=="key"||!e.info.decoderConfig.colorSpace||!e.info.decoderConfig.colorSpace.matrix)return;let r=0;if(R(t.data,0,2)!==2)return;r+=2;let s=(R(t.data,r+1,r+2)<<1)+R(t.data,r+0,r+1);r+=2,s===3&&r++;let n=R(t.data,r+0,r+1);if(r++,n)return;let a=R(t.data,r+0,r+1);if(r++,a!==0)return;r+=2;let c=R(t.data,r+0,r+24);if(r+=24,c!==4817730)return;s>=2&&r++;let o={rgb:7,bt709:2,bt470bg:1,smpte170m:3}[e.info.decoderConfig.colorSpace.matrix];Mt(t.data,r+0,r+3,o)}createInternalChunk(e,t,r,s,n=null){return{data:e,type:s,timestamp:t,duration:r,additions:n}}writeBlock(e,t){this.segment||(this.createTracks(),this.createSegment());let r=Math.floor(1e3*t.timestamp),s=this.trackDatas.every(m=>{if(m.track.source._closed)return!0;if(e===m)return t.type==="key";let l=m.chunkQueue[0];return l&&l.type==="key"});(!this.currentCluster||s&&r-this.currentClusterMsTimestamp>=1e3)&&this.createNewCluster(r);let n=r-this.currentClusterMsTimestamp;if(n<0)return;if(n>=At)throw new Error(`Current Matroska cluster exceeded its maximum allowed length of ${At} milliseconds. In order to produce a correct WebM file, you must pass in a key frame at least every ${At} milliseconds.`);let c=new Uint8Array(4),o=new DataView(c.buffer);o.setUint8(0,128|e.track.id),o.setInt16(1,n,!1);let u=Math.floor(1e3*t.duration);if(u===0&&!t.additions){o.setUint8(3,+(t.type==="key")<<7);let m={id:163,data:[c,t.data]};this.writeEBML(m)}else{let m={id:160,data:[{id:161,data:[c,t.data]},t.type==="delta"?{id:251,data:new Te(e.lastWrittenMsTimestamp-r)}:null,t.additions?{id:30113,data:[{id:166,data:[{id:165,data:t.additions},{id:238,data:1}]}]}:null,u>0?{id:155,data:u}:null]};this.writeEBML(m)}this.duration=Math.max(this.duration,r+u),e.lastWrittenMsTimestamp=r,this.trackDatasInCurrentCluster.add(e)}createNewCluster(e){this.currentCluster&&!this.format._options.streamable&&this.finalizeCurrentCluster(),this.currentCluster={id:524531317,size:this.format._options.streamable?-1:mr,data:[{id:231,data:e}]},this.writeEBML(this.currentCluster),this.currentClusterMsTimestamp=e,this.trackDatasInCurrentCluster.clear()}finalizeCurrentCluster(){d(this.currentCluster);let e=this.writer.getPos()-this.dataOffsets.get(this.currentCluster),t=this.writer.getPos();this.writer.seek(this.offsets.get(this.currentCluster)+4),this.writeEBMLVarInt(e,mr),this.writer.seek(t);let r=this.offsets.get(this.currentCluster)-this.segmentDataOffset;d(this.cues),this.cues.data.push({id:187,data:[{id:179,data:this.currentClusterMsTimestamp},...[...this.trackDatasInCurrentCluster].map(s=>({id:183,data:[{id:247,data:s.track.id},{id:241,data:r}]}))]})}async onTrackClose(){let e=await this.mutex.acquire();await this.interleaveChunks(),e()}async finalize(){let e=await this.mutex.acquire();this.segment||(this.createTracks(),this.createSegment());for(let t of this.trackDatas)for(;t.chunkQueue.length>0;)this.writeBlock(t,t.chunkQueue.shift());if(!this.format._options.streamable&&this.currentCluster&&this.finalizeCurrentCluster(),d(this.cues),this.writeEBML(this.cues),!this.format._options.streamable){let t=this.writer.getPos(),r=this.writer.getPos()-this.segmentDataOffset;this.writer.seek(this.offsets.get(this.segment)+4),this.writeEBMLVarInt(r,ur),this.segmentDuration.data=new ue(this.duration),this.writer.seek(this.offsets.get(this.segmentDuration)),this.writeEBML(this.segmentDuration),this.seekHead.data[0].data[1].data=this.offsets.get(this.cues)-this.segmentDataOffset,this.seekHead.data[1].data[1].data=this.offsets.get(this.segmentInfo)-this.segmentDataOffset,this.seekHead.data[2].data[1].data=this.offsets.get(this.tracksElement)-this.segmentDataOffset,this.writer.seek(this.offsets.get(this.seekHead)),this.writeEBML(this.seekHead),this.writer.seek(t)}e()}};var L=class{},Ke=class extends L{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.fastStart!==void 0&&![!1,"in-memory","fragmented"].includes(e.fastStart))throw new TypeError('options.fastStart, when provided, must be false, "in-memory", or "fragmented".');super(),this._options=e}_createMuxer(e){return new He(e,this)}},xe=class extends L{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.streamable!==void 0&&typeof e.streamable!="boolean")throw new TypeError("options.streamable, when provided, must be a boolean.");super(),this._options=e}_createMuxer(e){return new Le(e,this)}},ee=class extends xe{};var te=class{_connectedTrack=null;_closed=!1;_offsetTimestamps=!1;_ensureValidDigest(){if(!this._connectedTrack)throw new Error("Cannot call digest without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call digest before output has been started.");if(this._connectedTrack.output._finalizing)throw new Error("Cannot call digest after output has started finalizing.");if(this._closed)throw new Error("Cannot call digest after source has been closed.")}_start(){}async _flush(){}close(){if(this._closed)throw new Error("Source already closed.");if(!this._connectedTrack)throw new Error("Cannot call close without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call close before output has been started.");this._closed=!0,!this._connectedTrack.output._finalizing&&this._connectedTrack.output._muxer.onTrackClose(this._connectedTrack)}},z=class extends te{_connectedTrack=null;_codec;constructor(e){if(super(),!Z.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${Z.join(", ")}.`);this._codec=e}},$e=class extends z{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},Ai=5,Ri=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!Z.includes(i.codec))throw new TypeError(`Invalid video codec '${i.codec}'. Must be one of: ${Z.join(", ")}.`);if(!Number.isInteger(i.bitrate)||i.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.");if(i.latencyMode!==void 0&&!["quality","realtime"].includes(i.latencyMode))throw new TypeError("config.latencyMode, when provided, must be 'quality' or 'realtime'.")},Ce=class{constructor(e,t){this.source=e;this.codecConfig=t;Ri(t)}encoder=null;muxer=null;lastMultipleOfKeyFrameInterval=-1;lastWidth=null;lastHeight=null;async digest(e){if(this.source._ensureValidDigest(),this.lastWidth!==null&&this.lastHeight!==null){if(e.codedWidth!==this.lastWidth||e.codedHeight!==this.lastHeight)throw new Error(`Video frame size must remain constant. Expected ${this.lastWidth}x${this.lastHeight}, got ${e.codedWidth}x${e.codedHeight}.`)}else this.lastWidth=e.codedWidth,this.lastHeight=e.codedHeight;this.ensureEncoder(e),d(this.encoder);let t=Math.floor(e.timestamp/1e6/Ai);this.encoder.encode(e,{keyFrame:t!==this.lastMultipleOfKeyFrameInterval}),this.lastMultipleOfKeyFrameInterval=t,this.encoder.encodeQueueSize>=4&&await new Promise(r=>this.encoder.addEventListener("dequeue",r,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new VideoEncoder({output:(t,r)=>void this.muxer.addEncodedVideoChunk(this.source._connectedTrack,t,r),error:t=>console.error("Video encode error:",t)}),this.encoder.configure({codec:tr(this.codecConfig.codec,e.codedWidth,e.codedHeight,this.codecConfig.bitrate),width:e.codedWidth,height:e.codedHeight,bitrate:this.codecConfig.bitrate,framerate:this.source._connectedTrack?.metadata.frameRate,latencyMode:this.codecConfig.latencyMode,...nr(this.codecConfig.codec)}),d(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},Qe=class extends z{_encoder;constructor(e){super(e.codec),this._encoder=new Ce(this,e)}digest(e){if(!(e instanceof VideoFrame))throw new TypeError("videoFrame must be a VideoFrame.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},je=class extends z{_encoder;_canvas;constructor(e,t){if(!(e instanceof HTMLCanvasElement))throw new TypeError("canvas must be an HTMLCanvasElement.");super(t.codec),this._encoder=new Ce(this,t),this._canvas=e}digest(e,t=0){if(!Number.isFinite(e)||e<0)throw new TypeError("timestamp must be a non-negative number.");if(!Number.isFinite(t)||t<0)throw new TypeError("duration must be a non-negative number.");let r=new VideoFrame(this._canvas,{timestamp:Math.round(1e6*e),duration:Math.round(1e6*t),alpha:"discard"}),s=this._encoder.digest(r);return r.close(),s}_flush(){return this._encoder.flush()}},qe=class extends z{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="video")throw new TypeError("track must be a video MediaStreamTrack.");t={...t,latencyMode:"realtime"},super(t.codec),this._encoder=new Ce(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:r=>{this._encoder.digest(r),r.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(r=>{r instanceof DOMException&&r.name==="AbortError"||console.error("Pipe error:",r)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},U=class extends te{_connectedTrack=null;_codec;constructor(e){if(super(),!J.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${J.join(", ")}.`);this._codec=e}},Xe=class extends U{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},Oi=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!J.includes(i.codec))throw new TypeError(`Invalid audio codec '${i.codec}'. Must be one of: ${J.join(", ")}.`);if(!Number.isInteger(i.bitrate)||i.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.")},Se=class{constructor(e,t){this.source=e;this.codecConfig=t;Oi(t)}encoder=null;muxer=null;lastNumberOfChannels=null;lastSampleRate=null;async digest(e){if(this.source._ensureValidDigest(),this.lastNumberOfChannels!==null&&this.lastSampleRate!==null){if(e.numberOfChannels!==this.lastNumberOfChannels||e.sampleRate!==this.lastSampleRate)throw new Error(`Audio parameters must remain constant. Expected ${this.lastNumberOfChannels} channels at ${this.lastSampleRate} Hz, got ${e.numberOfChannels} channels at ${e.sampleRate} Hz.`)}else this.lastNumberOfChannels=e.numberOfChannels,this.lastSampleRate=e.sampleRate;this.ensureEncoder(e),d(this.encoder),this.encoder.encode(e),this.encoder.encodeQueueSize>=4&&await new Promise(t=>this.encoder.addEventListener("dequeue",t,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new AudioEncoder({output:(t,r)=>void this.muxer.addEncodedAudioChunk(this.source._connectedTrack,t,r),error:t=>console.error("Audio encode error:",t)}),this.encoder.configure({codec:ir(this.codecConfig.codec,e.numberOfChannels,e.sampleRate),numberOfChannels:e.numberOfChannels,sampleRate:e.sampleRate,bitrate:this.codecConfig.bitrate,...ar(this.codecConfig.codec)}),d(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},Ge=class extends U{_encoder;constructor(e){super(e.codec),this._encoder=new Se(this,e)}digest(e){if(!(e instanceof AudioData))throw new TypeError("audioData must be an AudioData.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},Ye=class extends U{_encoder;_accumulatedFrameCount=0;constructor(e){super(e.codec),this._encoder=new Se(this,e)}digest(e){if(!(e instanceof AudioBuffer))throw new TypeError("audioBuffer must be an AudioBuffer.");let t=e.numberOfChannels,r=e.sampleRate,s=e.length,n=new Float32Array(t*s);for(let o=0;o<t;o++){let u=e.getChannelData(o);n.set(u,o*s)}let a=new AudioData({format:"f32-planar",sampleRate:r,numberOfFrames:s,numberOfChannels:t,timestamp:Math.round(1e6*this._accumulatedFrameCount/r),data:n}),c=this._encoder.digest(a);return a.close(),this._accumulatedFrameCount+=s,c}_flush(){return this._encoder.flush()}},Ze=class extends U{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="audio")throw new TypeError("track must be an audio MediaStreamTrack.");super(t.codec),this._encoder=new Se(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:r=>{this._encoder.digest(r),r.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(r=>{r instanceof DOMException&&r.name==="AbortError"||console.error("Pipe error:",r)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},re=class extends te{_connectedTrack=null;_codec;constructor(e){if(super(),!ke.includes(e))throw new TypeError(`Invalid subtitle codec '${e}'. Must be one of: ${ke.join(", ")}.`);this._codec=e}},Je=class extends re{_parser;constructor(e){super(e),this._parser=new Ee({codec:e,output:(t,r)=>this._connectedTrack?.output._muxer.addSubtitleCue(this._connectedTrack,t,r),error:t=>console.error("Subtitle parse error:",t)})}digest(e){if(typeof e!="string")throw new TypeError("text must be a string.");return this._ensureValidDigest(),this._parser.parse(e),this._connectedTrack.output._muxer.mutex.currentPromise}};var et=class{_muxer;_writer;_tracks=[];_started=!1;_finalizing=!1;_mutex=new N;constructor(e){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(!(e.format instanceof L))throw new TypeError("options.format must be an OutputFormat.");if(!(e.target instanceof H))throw new TypeError("options.target must be a Target.");if(e.target._output)throw new Error("Target is already used for another output.");e.target._output=this,this._writer=e.target._createWriter(),this._muxer=e.format._createMuxer(this)}addVideoTrack(e,t={}){if(!(e instanceof z))throw new TypeError("source must be a VideoSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");if(typeof t.rotation=="number"&&![0,90,180,270].includes(t.rotation))throw new TypeError(`Invalid video rotation: ${t.rotation}. Has to be 0, 90, 180 or 270.`);if(Array.isArray(t.rotation)&&(t.rotation.length!==9||t.rotation.some(r=>!Number.isFinite(r))))throw new TypeError(`Invalid video transformation matrix: ${t.rotation.join()}`);if(t.frameRate!==void 0&&(!Number.isInteger(t.frameRate)||t.frameRate<=0))throw new TypeError(`Invalid video frame rate: ${t.frameRate}. Must be a positive integer.`);this._addTrack("video",e,t)}addAudioTrack(e,t={}){if(!(e instanceof U))throw new TypeError("source must be an AudioSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("audio",e,t)}addSubtitleTrack(e,t={}){if(!(e instanceof re))throw new TypeError("source must be a SubtitleSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("subtitle",e,t)}_addTrack(e,t,r){if(this._started)throw new Error("Cannot add track after output has started.");if(t._connectedTrack)throw new Error("Source is already used for a track.");let s={id:this._tracks.length+1,output:this,type:e,source:t,metadata:r};this._muxer.beforeTrackAdd(s),this._tracks.push(s),t._connectedTrack=s}async start(){if(this._started)throw new Error("Output already started.");this._started=!0,this._writer.start();let e=await this._mutex.acquire();await this._muxer.start();for(let t of this._tracks)t.source._start();e()}async finalize(){if(!this._started)throw new Error("Cannot finalize before starting.");if(this._finalizing)throw new Error("Cannot call finalize twice.");this._finalizing=!0;let e=await this._mutex.acquire(),t=this._tracks.map(r=>r.source._flush());await Promise.all(t),await this._muxer.finalize(),await this._writer.flush(),await this._writer.finalize(),e()}};var me=class{_sizePromise=null;_getSize(){return this._sizePromise??=this._retrieveSize()}},tt=class extends me{constructor(t){super();this.buffer=t}async _read(t,r){return new Uint8Array(this.buffer,t,r-t)}async _retrieveSize(){return this.buffer.byteLength}},rt=class extends me{constructor(t){super();this.blob=t}async _read(t,r){let n=await this.blob.slice(t,r).arrayBuffer();return new Uint8Array(n)}async _retrieveSize(){return this.blob.size}};var de=class{input;constructor(e){this.input=e}};var it=class{_backing;constructor(e){this._backing=e}isVideoTrack(){return this instanceof we}isAudioTrack(){return this instanceof ye}computeDuration(){return this._backing.computeDuration()}},we=class extends it{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getWidth(){return this._backing.getWidth()}getHeight(){return this._backing.getHeight()}getRotation(){return this._backing.getRotation()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}},ye=class extends it{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getNumberOfChannels(){return this._backing.getNumberOfChannels()}getSampleRate(){return this._backing.getSampleRate()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}};var le=class{constructor(e,t=1/0){this.source=e;this.maxStorableBytes=t}loadedSegments=[];loadingSegments=[];sourceSizePromise=null;nextAge=0;totalStoredBytes=0;async loadRange(e,t){t=Math.min(t,await this.source._getSize());let r=this.loadingSegments.find(o=>o.start<=e&&o.end>=t);if(r){await r.promise;return}if(this.loadedSegments.some(o=>o.start<=e&&o.end>=t))return;let n=this.source._read(e,t),a={start:e,end:t,promise:n};this.loadingSegments.push(a);let c=await n;Bt(this.loadingSegments,a),this.insertIntoLoadedSegments(e,c)}insertIntoLoadedSegments(e,t){let r={start:e,end:e+t.byteLength,bytes:t,view:new DataView(t.buffer),age:this.nextAge++},s=I(this.loadedSegments,e,n=>n.start);(s===-1||this.loadedSegments[s].start<r.start)&&s++,this.loadedSegments.splice(s,0,r),this.totalStoredBytes+=t.byteLength;for(let n=s+1;n<this.loadedSegments.length;n++){let a=this.loadedSegments[n];if(a.start>=r.end)break;r.start<=a.start&&a.end<=r.end&&(this.loadedSegments.splice(n,1),n--)}for(;this.totalStoredBytes>this.maxStorableBytes&&this.loadedSegments.length>1;){let n=null,a=-1;for(let c=0;c<this.loadedSegments.length;c++){let o=this.loadedSegments[c];(!n||o.age<n.age)&&(n=o,a=c)}d(n),this.totalStoredBytes-=n.bytes.byteLength,this.loadedSegments.splice(a,1)}}getViewAndOffset(e,t){let r=I(this.loadedSegments,e,n=>n.start),s=null;if(r!==-1)for(let n=r;n<this.loadedSegments.length;n++){let a=this.loadedSegments[n];if(a.start>e)break;if(t<=a.end){s=a;break}}if(!s)throw new Error(`No segment loaded for range [${e}, ${t}).`);return s.age=this.nextAge++,{view:s.view,offset:s.bytes.byteOffset+e-s.start}}forgetRange(e,t){if(t<=e)return;let r=I(this.loadedSegments,e,n=>n.start);if(r===-1)return;let s=this.loadedSegments[r];s.start!==e||s.end!==t||(this.loadedSegments.splice(r,1),this.totalStoredBytes-=s.bytes.byteLength)}};var ie=class{constructor(e){this.reader=e}pos=0;readRange(e,t){let{view:r,offset:s}=this.reader.getViewAndOffset(e,t);return new Uint8Array(r.buffer,s,t-e)}readU8(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+1);return this.pos++,e.getUint8(t)}readU16(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+2);return this.pos+=2,e.getUint16(t,!1)}readU24(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+3);this.pos+=3;let r=e.getUint16(t,!1),s=e.getUint8(t+2);return r*256+s}readS32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getUint32(t,!1)}readI32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU64(){let e=this.readU32(),t=this.readU32();return e*4294967296+t}readF64(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+8);return this.pos+=8,e.getFloat64(t,!1)}readFixed_16_16(){return this.readS32()/65536}readFixed_2_30(){return this.readS32()/1073741824}readAscii(e){let{view:t,offset:r}=this.reader.getViewAndOffset(this.pos,this.pos+e);this.pos+=e;let s="";for(let n=0;n<e;n++)s+=String.fromCharCode(t.getUint8(r+n));return s}readIsomVariableInteger(){let e=0;for(let t=0;t<4;t++){e<<=7;let r=this.readU8();if(e|=r&127,!(r&128))break}return e}readBoxHeader(){let e=this.readU32(),t=this.readAscii(4),r=8;return e===1&&(e=this.readU64(),r=16),{name:t,totalSize:e,headerSize:r,contentSize:e-r}}};var _i=[W(0),W(90),W(180),W(270)],st=class extends de{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new N;chunkReader;constructor(e){super(e),this.isobmffReader=new ie(e._mainReader),this.chunkReader=new ie(new le(e._source,64*2**20))}async computeDuration(){let e=await this.getTracks(),t=await Promise.all(e.map(r=>r.computeDuration()));return Math.max(0,...t)}async getTracks(){return await this.readMetadata(),this.tracks.map(e=>e.inputTrack)}async getMimeType(){await this.readMetadata();let e="video/mp4";if(this.tracks.length>0){let t=await Promise.all(this.tracks.map(s=>s.inputTrack.getCodecMimeType())),r=[...new Set(t)];e+=`; codecs="${r.join(", ")}"`}return e}readMetadata(){return this.metadataPromise??=(async()=>{let e=await this.isobmffReader.reader.source._getSize();for(;this.isobmffReader.pos<e;){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.pos,r=this.isobmffReader.readBoxHeader();if(r.name==="moov"){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+r.contentSize),this.readContiguousBoxes(r.contentSize);break}this.isobmffReader.pos=t+r.totalSize}if(this.isFragmented){await this.isobmffReader.reader.loadRange(e-4,e),this.isobmffReader.pos=e-4;let t=this.isobmffReader.readU32(),r=e-t;if(r>=0&&r<e){await this.isobmffReader.reader.loadRange(r,e),this.isobmffReader.pos=r;let s=this.isobmffReader.readBoxHeader();s.name==="mfra"&&this.readContiguousBoxes(s.contentSize)}}})()}getSampleTableForTrack(e){if(e.sampleTable)return e.sampleTable;let t={sampleTimingEntries:[],sampleCompositionTimeOffsets:[],sampleSizes:[],keySampleIndices:null,chunkOffsets:[],sampleToChunk:[],presentationTimestamps:[]};e.sampleTable=t,this.isobmffReader.pos=e.sampleTableOffset,this.currentTrack=e,this.traverseBox(),this.currentTrack=null;for(let r of t.sampleTimingEntries)for(let s=0;s<r.count;s++)t.presentationTimestamps.push({presentationTimestamp:r.startDecodeTimestamp+s*r.delta,sampleIndex:r.startIndex+s});for(let r of t.sampleCompositionTimeOffsets)for(let s=0;s<r.count;s++){let n=r.startIndex+s,a=t.presentationTimestamps[n];a&&(a.presentationTimestamp+=r.offset)}return t.presentationTimestamps.sort((r,s)=>r.presentationTimestamp-s.presentationTimestamp),e.sampleTable}async readFragment(){let e=this.isobmffReader.pos;await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.readBoxHeader();d(t.name==="moof"),await this.isobmffReader.reader.loadRange(e,e+t.totalSize),this.isobmffReader.pos=e,this.traverseBox();let r=B(this.fragments,e,n=>n.moofOffset);d(r!==-1);let s=this.fragments[r];d(s.moofOffset===e),this.isobmffReader.reader.forgetRange(e,e+t.totalSize);for(let[n,a]of s.trackData){if(a.startTimestampIsFinal)continue;let c=this.tracks.find(l=>l.id===n);this.isobmffReader.pos=0;let o=null,u=null,m=I(c.fragments,e-1,l=>l.moofOffset);for(m!==-1&&(o=c.fragments[m],u=o,this.isobmffReader.pos=o.moofOffset+o.moofSize);this.isobmffReader.pos<e;){if(o?.nextFragment)o=o.nextFragment,this.isobmffReader.pos=o.moofOffset+o.moofSize;else{await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let l=this.isobmffReader.pos,p=this.isobmffReader.readBoxHeader();if(p.name==="moof"){let h=B(this.fragments,l,b=>b.moofOffset);if(h===-1){this.isobmffReader.pos=l;let b=await this.readFragment();o&&(o.nextFragment=b),o=b}else{let b=this.fragments[h];o&&(o.nextFragment=b),o=b}}this.isobmffReader.pos=l+p.totalSize}o&&o.trackData.has(n)&&(u=o)}if(u){let l=u.trackData.get(n);d(l.startTimestampIsFinal),lr(a,l.endTimestamp)}a.startTimestampIsFinal=!0}return s}readContiguousBoxes(e){let t=this.isobmffReader.pos;for(;this.isobmffReader.pos-t<e;)this.traverseBox()}traverseBox(){let e=this.isobmffReader.pos,t=this.isobmffReader.readBoxHeader(),r=e+t.totalSize;switch(t.name){case"mdia":case"minf":case"dinf":case"mfra":this.readContiguousBoxes(t.contentSize);break;case"mvhd":{let s=this.isobmffReader.readU8();this.isobmffReader.pos+=3,s===1?(this.isobmffReader.pos+=16,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU64()):(this.isobmffReader.pos+=8,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU32())}break;case"trak":{let s={id:-1,demuxer:this,inputTrack:null,info:null,timescale:-1,durationInTimescale:-1,rotation:0,sampleTableOffset:-1,sampleTable:null,fragmentLookupTable:null,currentFragmentState:null,fragments:[]};if(this.currentTrack=s,this.readContiguousBoxes(t.contentSize),s.id!==-1&&s.timescale!==-1&&s.info!==null){if(s.info.type==="video"&&s.info.codec!==null){let n=s;s.inputTrack=new we(new Rt(n)),this.tracks.push(s)}else if(s.info.type==="audio"&&s.info.codec!==null){let n=s;if(s.inputTrack=new ye(new Ot(n)),this.tracks.push(s),s.info.codec==="aac"){let a=yt(s.info.codecDescription);a.numberOfChannels!==null&&(s.info.numberOfChannels=a.numberOfChannels),a.sampleRate!==null&&(s.info.sampleRate=a.sampleRate)}}}this.currentTrack=null}break;case"tkhd":{let s=this.currentTrack;d(s);let n=this.isobmffReader.readU8();if(!((this.isobmffReader.readU24()&1)!==0))break;if(n===0)this.isobmffReader.pos+=8,s.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=8;else if(n===1)this.isobmffReader.pos+=16,s.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=12;else throw new Error(`Incorrect track header version ${n}.`);this.isobmffReader.pos+=2*4+2+2+2+2;let o=[];o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16()),this.isobmffReader.pos+=4,o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16());let u=_i.findIndex(m=>m.every((l,p)=>l===o[p]));u===-1?s.rotation=0:s.rotation=90*u}break;case"mdhd":{let s=this.currentTrack;d(s);let n=this.isobmffReader.readU8();this.isobmffReader.pos+=3,n===0?(this.isobmffReader.pos+=8,s.timescale=this.isobmffReader.readU32(),s.durationInTimescale=this.isobmffReader.readU32()):n===1&&(this.isobmffReader.pos+=16,s.timescale=this.isobmffReader.readU32(),s.durationInTimescale=this.isobmffReader.readU64())}break;case"hdlr":{let s=this.currentTrack;d(s),this.isobmffReader.pos+=8;let n=this.isobmffReader.readAscii(4);n==="vide"?s.info={type:"video",width:-1,height:-1,codec:null,codecDescription:null,colorSpace:null}:n==="soun"&&(s.info={type:"audio",numberOfChannels:-1,sampleRate:-1,codec:null,codecDescription:null})}break;case"stbl":{let s=this.currentTrack;d(s),s.sampleTableOffset=e,this.readContiguousBoxes(t.contentSize)}break;case"stsd":{let s=this.currentTrack;if(d(s),s.info===null||s.sampleTable)break;let n=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=this.isobmffReader.readU32();for(let c=0;c<a;c++){let o=this.isobmffReader.readBoxHeader();if(s.info.type==="video"){if(o.name==="avc1")s.info.codec="avc";else if(o.name==="hvc1"||o.name==="hev1")s.info.codec="hevc";else{console.warn(`Unsupported video sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2+2+2+3*4,s.info.width=this.isobmffReader.readU16(),s.info.height=this.isobmffReader.readU16(),this.isobmffReader.pos+=50,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}else{if(o.name==="mp4a")s.info.codec="aac";else if(o.name.toLowerCase()==="opus")s.info.codec="opus";else{console.warn(`Unsupported audio sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2;let u=this.isobmffReader.readU16();this.isobmffReader.pos+=3*2;let m=this.isobmffReader.readU16();this.isobmffReader.pos+=6;let l=this.isobmffReader.readU32()/65536;if(n===0&&u>0){if(u===1)this.isobmffReader.pos+=4*4;else if(u===2){this.isobmffReader.pos+=4,l=this.isobmffReader.readF64(),m=this.isobmffReader.readU32(),this.isobmffReader.pos+=4;let p=this.isobmffReader.readU32(),h=this.isobmffReader.readU32(),b=this.isobmffReader.readU32(),k=this.isobmffReader.readU32()}}s.info.numberOfChannels=m,s.info.sampleRate=l,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}}}break;case"avcC":{let s=this.currentTrack;d(s&&s.info),s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"hvcC":{let s=this.currentTrack;d(s&&s.info),s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"colr":{let s=this.currentTrack;if(d(s&&s.info?.type==="video"),this.isobmffReader.readAscii(4)!=="nclx")break;let a=this.isobmffReader.readU16(),c=this.isobmffReader.readU16(),o=this.isobmffReader.readU16(),u=!!(this.isobmffReader.readU8()&128);s.info.colorSpace={primaries:Vt[a],transfer:Pt[c],matrix:Dt[o],fullRange:u}}break;case"wave":t.totalSize>8&&this.readContiguousBoxes(t.contentSize);break;case"esds":{let s=this.currentTrack;d(s&&s.info),this.isobmffReader.pos+=4;let n=this.isobmffReader.readU8();d(n===3),this.isobmffReader.readIsomVariableInteger(),this.isobmffReader.pos+=2;let a=this.isobmffReader.readU8(),c=(a&128)!==0,o=(a&64)!==0,u=(a&32)!==0;if(c&&(this.isobmffReader.pos+=2),o){let b=this.isobmffReader.readU8();this.isobmffReader.pos+=b}u&&(this.isobmffReader.pos+=2);let m=this.isobmffReader.readU8();d(m===4),this.isobmffReader.readIsomVariableInteger();let l=this.isobmffReader.readU8();d(l===64),this.isobmffReader.pos+=12;let p=this.isobmffReader.readU8();d(p===5);let h=this.isobmffReader.readIsomVariableInteger();s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+h)}break;case"stts":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32(),a=0,c=0;for(let o=0;o<n;o++){let u=this.isobmffReader.readU32(),m=this.isobmffReader.readU32();s.sampleTable.sampleTimingEntries.push({startIndex:a,startDecodeTimestamp:c,count:u,delta:m}),a+=u,c+=u*m}}break;case"ctts":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32(),a=0;for(let c=0;c<n;c++){let o=this.isobmffReader.readU32(),u=this.isobmffReader.readI32();s.sampleTable.sampleCompositionTimeOffsets.push({startIndex:a,count:o,offset:u}),a+=o}}break;case"stsz":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32(),a=this.isobmffReader.readU32();if(n===0)for(let c=0;c<a;c++){let o=this.isobmffReader.readU32();s.sampleTable.sampleSizes.push(o)}else s.sampleTable.sampleSizes.push(n)}break;case"stz2":throw new Error("Unsupported.");case"stss":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4,s.sampleTable.keySampleIndices=[];let n=this.isobmffReader.readU32();for(let a=0;a<n;a++){let c=this.isobmffReader.readU32()-1;s.sampleTable.keySampleIndices.push(c)}}break;case"stsc":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32();for(let c=0;c<n;c++){let o=this.isobmffReader.readU32()-1,u=this.isobmffReader.readU32(),m=this.isobmffReader.readU32();s.sampleTable.sampleToChunk.push({startSampleIndex:-1,startChunkIndex:o,samplesPerChunk:u,sampleDescriptionIndex:m})}let a=0;for(let c=0;c<s.sampleTable.sampleToChunk.length;c++)if(s.sampleTable.sampleToChunk[c].startSampleIndex=a,c<s.sampleTable.sampleToChunk.length-1){let u=s.sampleTable.sampleToChunk[c+1].startChunkIndex-s.sampleTable.sampleToChunk[c].startChunkIndex;a+=u*s.sampleTable.sampleToChunk[c].samplesPerChunk}}break;case"stco":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32();for(let a=0;a<n;a++){let c=this.isobmffReader.readU32();s.sampleTable.chunkOffsets.push(c)}}break;case"co64":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32();for(let a=0;a<n;a++){let c=this.isobmffReader.readU64();s.sampleTable.chunkOffsets.push(c)}}break;case"mvex":this.isFragmented=!0,this.readContiguousBoxes(t.contentSize);break;case"mehd":{let s=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32();this.movieDurationInTimescale=n}break;case"trex":{this.isobmffReader.pos+=4;let s=this.isobmffReader.readU32(),n=this.isobmffReader.readU32(),a=this.isobmffReader.readU32(),c=this.isobmffReader.readU32(),o=this.isobmffReader.readU32();this.fragmentTrackDefaults.push({trackId:s,defaultSampleDescriptionIndex:n,defaultSampleDuration:a,defaultSampleSize:c,defaultSampleFlags:o})}break;case"tfra":{let s=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=this.isobmffReader.readU32(),a=this.tracks.find(w=>w.id===n);if(!a)break;a.fragmentLookupTable=[];let c=this.isobmffReader.readU32(),o=(c&48)>>4,u=(c&12)>>2,m=c&3,l=this.isobmffReader,p=[l.readU8.bind(l),l.readU16.bind(l),l.readU24.bind(l),l.readU32.bind(l)],h=p[o],b=p[u],k=p[m],g=this.isobmffReader.readU32();for(let w=0;w<g;w++){let v=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),_=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),K=h(),E=b(),F=k();a.fragmentLookupTable.push({timestamp:v,moofOffset:_})}}break;case"moof":{this.currentFragment={moofOffset:e,moofSize:t.totalSize,implicitBaseDataOffset:e,trackData:new Map,dataStart:1/0,dataEnd:0,nextFragment:null},this.readContiguousBoxes(t.contentSize);let s=I(this.fragments,this.currentFragment.moofOffset,n=>n.moofOffset);this.fragments.splice(s+1,0,this.currentFragment);for(let[,n]of this.currentFragment.trackData){let a=n.samples[0],c=A(n.samples);this.currentFragment.dataStart=Math.min(this.currentFragment.dataStart,a.byteOffset),this.currentFragment.dataEnd=Math.max(this.currentFragment.dataEnd,c.byteOffset+c.byteSize)}this.currentFragment=null}break;case"traf":if(d(this.currentFragment),this.readContiguousBoxes(t.contentSize),this.currentTrack){let s=this.currentFragment.trackData.get(this.currentTrack.id);if(s){let n=I(this.currentTrack.fragments,this.currentFragment.moofOffset,c=>c.moofOffset);this.currentTrack.fragments.splice(n+1,0,this.currentFragment);let{currentFragmentState:a}=this.currentTrack;d(a),a.startTimestamp!==null&&(lr(s,a.startTimestamp),s.startTimestampIsFinal=!0)}this.currentTrack.currentFragmentState=null,this.currentTrack=null}break;case"tfhd":{d(this.currentFragment),this.isobmffReader.pos+=1;let s=this.isobmffReader.readU24(),n=!!(s&1),a=!!(s&2),c=!!(s&8),o=!!(s&16),u=!!(s&32),m=!!(s&65536),l=!!(s&131072),p=this.isobmffReader.readU32(),h=this.tracks.find(k=>k.id===p);if(!h)break;let b=this.fragmentTrackDefaults.find(k=>k.trackId===p);this.currentTrack=h,h.currentFragmentState={baseDataOffset:this.currentFragment.implicitBaseDataOffset,sampleDescriptionIndex:b?.defaultSampleDescriptionIndex??null,defaultSampleDuration:b?.defaultSampleDuration??null,defaultSampleSize:b?.defaultSampleSize??null,defaultSampleFlags:b?.defaultSampleFlags??null,startTimestamp:null},n?h.currentFragmentState.baseDataOffset=this.isobmffReader.readU64():l&&(h.currentFragmentState.baseDataOffset=this.currentFragment.moofOffset),a&&(h.currentFragmentState.sampleDescriptionIndex=this.isobmffReader.readU32()),c&&(h.currentFragmentState.defaultSampleDuration=this.isobmffReader.readU32()),o&&(h.currentFragmentState.defaultSampleSize=this.isobmffReader.readU32()),u&&(h.currentFragmentState.defaultSampleFlags=this.isobmffReader.readU32()),m&&(h.currentFragmentState.defaultSampleDuration=0)}break;case"tfdt":{let s=this.currentTrack;if(!s)break;d(s.currentFragmentState);let n=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=n===0?this.isobmffReader.readU32():this.isobmffReader.readU64();s.currentFragmentState.startTimestamp=a}break;case"trun":{let s=this.currentTrack;if(!s)break;if(d(this.currentFragment),d(s.currentFragmentState),this.currentFragment.trackData.has(s.id))throw new Error("Can't have two trun boxes for the same track in one fragment.");let n=this.isobmffReader.readU8(),a=this.isobmffReader.readU24(),c=!!(a&1),o=!!(a&4),u=!!(a&256),m=!!(a&512),l=!!(a&1024),p=!!(a&2048),h=this.isobmffReader.readU32(),b=s.currentFragmentState.baseDataOffset;c&&(b+=this.isobmffReader.readI32());let k=null;o&&(k=this.isobmffReader.readU32());let g=b;if(h===0){this.currentFragment.implicitBaseDataOffset=g;break}let w=0,v={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(s.id,v);for(let E=0;E<h;E++){let F;u?F=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleDuration!==null),F=s.currentFragmentState.defaultSampleDuration);let se;m?se=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleSize!==null),se=s.currentFragmentState.defaultSampleSize);let Oe;l?Oe=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleFlags!==null),Oe=s.currentFragmentState.defaultSampleFlags),E===0&&k!==null&&(Oe=k);let pt=0;p&&(n===0?pt=this.isobmffReader.readU32():pt=this.isobmffReader.readI32());let kr=!(Oe&65536);v.samples.push({presentationTimestamp:w+pt,duration:F,byteOffset:g,byteSize:se,isKeyFrame:kr}),g+=se,w+=F}v.presentationTimestamps=v.samples.map((E,F)=>({presentationTimestamp:E.presentationTimestamp,sampleIndex:F})).sort((E,F)=>E.presentationTimestamp-F.presentationTimestamp);let _=v.samples[v.presentationTimestamps[0].sampleIndex],K=v.samples[A(v.presentationTimestamps).sampleIndex];v.startTimestamp=_.presentationTimestamp,v.endTimestamp=K.presentationTimestamp+K.duration,this.currentFragment.implicitBaseDataOffset=g}break}this.isobmffReader.pos=r}},nt=class{constructor(e){this.internalTrack=e}chunkToSampleIndex=new WeakMap;sampleIndexToChunk=new Map;chunkToFragmentLocation=new WeakMap;fragmentLocationToChunk=new Map;getCodec(){throw new Error("Not implemented on base class.")}async computeDuration(){let t=(await this.getChunk(1/0,{metadataOnly:!0}))?.timestamp;return t?t/1e6:0}async getFirstChunk(e){return this.internalTrack.demuxer.isFragmented?this.performFragmentedLookup(()=>{let t=this.internalTrack.fragments[0];return{fragmentIndex:t?0:-1,sampleIndex:t?0:-1,correctSampleFound:!!t}},0,1/0,e):this.fetchChunkForSampleIndex(0,e)}async getChunk(e,t){let r=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findSampleInFragmentsForTimestamp(r),r,r,t);{let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=dr(s,r);return this.fetchChunkForSampleIndex(n,t)}}async getNextChunk(e,t){if(this.internalTrack.demuxer.isFragmented){let s=this.chunkToFragmentLocation.get(e);if(s===void 0)throw new Error("Chunk was not created from this track.");let n=s.fragment.trackData.get(this.internalTrack.id),a=n.samples[s.sampleIndex],c=B(this.internalTrack.fragments,s.fragment.moofOffset,o=>o.moofOffset);return d(c!==-1),this.performFragmentedLookup(()=>{if(s.sampleIndex+1<n.samples.length)return{fragmentIndex:c,sampleIndex:s.sampleIndex+1,correctSampleFound:!0};{let o=s.fragment;for(;o.nextFragment;)if(o=o.nextFragment,o.trackData.get(this.internalTrack.id)){let m=B(this.internalTrack.fragments,o.moofOffset,l=>l.moofOffset);return d(m!==-1),{fragmentIndex:m,sampleIndex:0,correctSampleFound:!0}}return{fragmentIndex:c,sampleIndex:-1,correctSampleFound:!1}}},a.presentationTimestamp,1/0,t)}let r=this.chunkToSampleIndex.get(e);if(r===void 0)throw new Error("Chunk was not created from this track.");return this.fetchChunkForSampleIndex(r+1,t)}async getKeyChunk(e,t){let r=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findKeySampleInFragmentsForTimestamp(r),r,r,t);let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=dr(s,r),a=n===-1?-1:Fi(s,n);return this.fetchChunkForSampleIndex(a,t)}async getNextKeyChunk(e,t){if(this.internalTrack.demuxer.isFragmented){let a=this.chunkToFragmentLocation.get(e);if(a===void 0)throw new Error("Chunk was not created from this track.");let c=a.fragment.trackData.get(this.internalTrack.id),o=c.samples[a.sampleIndex],u=B(this.internalTrack.fragments,a.fragment.moofOffset,m=>m.moofOffset);return d(u!==-1),this.performFragmentedLookup(()=>{let m=c.samples.findIndex((l,p)=>l.isKeyFrame&&p>a.sampleIndex);if(m!==-1)return{fragmentIndex:u,sampleIndex:m,correctSampleFound:!0};{let l=a.fragment;for(;l.nextFragment;){l=l.nextFragment;let p=l.trackData.get(this.internalTrack.id);if(p){let h=B(this.internalTrack.fragments,l.moofOffset,k=>k.moofOffset);d(h!==-1);let b=p.samples.findIndex(k=>k.isKeyFrame);if(b===-1)throw new Error("Not supported: Fragment does not contain key sample.");return{fragmentIndex:h,sampleIndex:b,correctSampleFound:!0}}}return{fragmentIndex:u,sampleIndex:-1,correctSampleFound:!1}}},o.presentationTimestamp,1/0,t)}let r=this.chunkToSampleIndex.get(e);if(r===void 0)throw new Error("Chunk was not created from this track.");let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=Mi(s,r);return this.fetchChunkForSampleIndex(n,t)}async fetchChunkForSampleIndex(e,t){if(e===-1)return null;let r=this.sampleIndexToChunk.get(e)?.deref();if(r)return r;let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=Ei(s,e);if(!n)return null;let a;t.metadataOnly?a=new Uint8Array(0):(await this.internalTrack.demuxer.chunkReader.reader.loadRange(n.chunkOffset,n.chunkOffset+n.chunkSize),a=this.internalTrack.demuxer.chunkReader.readRange(n.sampleOffset,n.sampleOffset+n.sampleSize));let c=1e6*n.presentationTimestamp/this.internalTrack.timescale,o=1e6*n.duration/this.internalTrack.timescale,u=this.createChunk(a,c,o,n.isKeyFrame);return this.chunkToSampleIndex.set(u,e),this.sampleIndexToChunk.set(e,new WeakRef(u)),u}async fetchChunkInFragment(e,t,r){if(t===-1)return null;let s=`${e.moofOffset}:${t}`,n=this.fragmentLocationToChunk.get(s)?.deref();if(n)return n;let c=e.trackData.get(this.internalTrack.id).samples[t];d(c);let o;r.metadataOnly?o=new Uint8Array(0):(await this.internalTrack.demuxer.chunkReader.reader.loadRange(e.dataStart,e.dataEnd),o=this.internalTrack.demuxer.chunkReader.readRange(c.byteOffset,c.byteOffset+c.byteSize));let u=1e6*c.presentationTimestamp/this.internalTrack.timescale,m=1e6*c.duration/this.internalTrack.timescale,l=this.createChunk(o,u,m,c.isKeyFrame);return this.chunkToFragmentLocation.set(l,{fragment:e,sampleIndex:t}),this.fragmentLocationToChunk.set(s,new WeakRef(l)),l}findSampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,n=>n.trackData.get(this.internalTrack.id).startTimestamp),r=-1,s=!1;if(t!==-1){let a=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=I(a.presentationTimestamps,e,o=>o.presentationTimestamp);d(c!==-1),r=a.presentationTimestamps[c].sampleIndex,s=e<a.endTimestamp}return{fragmentIndex:t,sampleIndex:r,correctSampleFound:s}}findKeySampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,n=>n.trackData.get(this.internalTrack.id).startTimestamp),r=-1,s=!1;if(t!==-1){let a=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=a.presentationTimestamps.findLastIndex(u=>a.samples[u.sampleIndex].isKeyFrame&&u.presentationTimestamp<=e);if(c===-1)throw new Error("Not supported: Fragment does not begin with a key sample.");r=a.presentationTimestamps[c].sampleIndex,s=e<a.endTimestamp}return{fragmentIndex:t,sampleIndex:r,correctSampleFound:s}}async performFragmentedLookup(e,t,r,s){let n=this.internalTrack.demuxer,a=await n.fragmentLookupMutex.acquire();try{let{fragmentIndex:c,sampleIndex:o,correctSampleFound:u}=e();if(u){let g=this.internalTrack.fragments[c];return this.fetchChunkInFragment(g,o,s)}let m=n.isobmffReader,l=await m.reader.source._getSize(),p=null,h=c,b=o,k=null;if(this.internalTrack.fragmentLookupTable){let g=I(this.internalTrack.fragmentLookupTable,t,w=>w.timestamp);g!==-1&&(k=this.internalTrack.fragmentLookupTable[g])}if(c===-1)m.pos=k?.moofOffset??0;else{let g=this.internalTrack.fragments[c];!k||g.moofOffset>=g.moofOffset?(m.pos=g.moofOffset+g.moofSize,p=g):m.pos=k.moofOffset}for(;m.pos<l;){if(p){let v=p.trackData.get(this.internalTrack.id);if(v&&v.startTimestamp>r)break;if(p.nextFragment){m.pos=p.nextFragment.moofOffset+p.nextFragment.moofSize,p=p.nextFragment;continue}}await m.reader.loadRange(m.pos,m.pos+16);let g=m.pos,w=m.readBoxHeader();if(w.name==="moof"){let v=B(n.fragments,g,_=>_.moofOffset);if(v===-1){m.pos=g;let _=await n.readFragment();p&&(p.nextFragment=_),p=_;let{fragmentIndex:K,sampleIndex:E,correctSampleFound:F}=e();if(F){let se=this.internalTrack.fragments[K];return this.fetchChunkInFragment(se,E,s)}K!==-1&&(h=K,b=E)}else{let _=n.fragments[v];p&&(p.nextFragment=_),p=_}}m.pos=g+w.totalSize}if(h!==-1){let g=this.internalTrack.fragments[h];return this.fetchChunkInFragment(g,b,s)}return null}finally{a()}}},Rt=class extends nt{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getWidth(){return this.internalTrack.info.width}async getHeight(){return this.internalTrack.info.height}async getRotation(){return this.internalTrack.rotation}async getDecoderConfig(){return{codec:rr(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),codedWidth:this.internalTrack.info.width,codedHeight:this.internalTrack.info.height,description:this.internalTrack.info.codecDescription??void 0,colorSpace:this.internalTrack.info.colorSpace??void 0}}createChunk(e,t,r,s){return new EncodedVideoChunk({data:e,timestamp:t,duration:r,type:s?"key":"delta"})}},Ot=class extends nt{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getNumberOfChannels(){return this.internalTrack.info.numberOfChannels}async getSampleRate(){return this.internalTrack.info.sampleRate}async getDecoderConfig(){return{codec:sr(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),numberOfChannels:this.internalTrack.info.numberOfChannels,sampleRate:this.internalTrack.info.sampleRate,description:this.internalTrack.info.codecDescription??void 0}}createChunk(e,t,r,s){return new EncodedAudioChunk({data:e,timestamp:t,duration:r,type:s?"key":"delta"})}},dr=(i,e)=>{let t=I(i.presentationTimestamps,e,r=>r.presentationTimestamp);return t===-1?-1:i.presentationTimestamps[t].sampleIndex},Ei=(i,e)=>{let t=I(i.sampleTimingEntries,e,k=>k.startIndex),r=i.sampleTimingEntries[t];if(!r||r.startIndex+r.count<=e)return null;let n=r.startDecodeTimestamp+(e-r.startIndex)*r.delta,a=I(i.sampleCompositionTimeOffsets,e,k=>k.startIndex),c=i.sampleCompositionTimeOffsets[a];c&&(n+=c.offset);let o=i.sampleSizes[Math.min(e,i.sampleSizes.length-1)],u=I(i.sampleToChunk,e,k=>k.startSampleIndex),m=i.sampleToChunk[u];d(m);let l=m.startChunkIndex+Math.floor((e-m.startSampleIndex)/m.samplesPerChunk),p=i.chunkOffsets[l],h=0,b=p;if(i.sampleSizes.length===1)b+=o*(e-m.startSampleIndex),h+=o*m.samplesPerChunk;else{let k=m.startSampleIndex+(l-m.startChunkIndex)*m.samplesPerChunk;for(let g=k;g<k+m.samplesPerChunk;g++){let w=i.sampleSizes[g];g<e&&(b+=w),h+=w}}return{presentationTimestamp:n,duration:r.delta,sampleOffset:b,sampleSize:o,chunkOffset:p,chunkSize:h,isKeyFrame:i.keySampleIndices?B(i.keySampleIndices,e,k=>k)!==-1:!0}},Fi=(i,e)=>{if(!i.keySampleIndices)return e;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t]??-1},Mi=(i,e)=>{if(!i.keySampleIndices)return e+1;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t+1]??-1},lr=(i,e)=>{i.startTimestamp+=e,i.endTimestamp+=e;for(let t of i.samples)t.presentationTimestamp+=e;for(let t of i.presentationTimestamps)t.presentationTimestamp+=e};var at=class extends de{};var ot=class{},_t=class extends ot{async _canReadInput(e){if(await e._mainReader.source._getSize()<8)return!1;let r=new ie(e._mainReader);return r.pos=4,r.readAscii(4)==="ftyp"}_createDemuxer(e){return new st(e)}},Et=class extends ot{async _canReadInput(){return!1}_createDemuxer(e){return new at(e)}},ve=new _t,fr=ve,pr=ve,ct=new Et,Ft=ct,hr=ct,br=[ve,Ft];var ut=class{_source;_formats;_mainReader;_demuxerPromise=null;_format=null;constructor(e){this._formats=e.formats,this._source=e.source,this._mainReader=new le(e.source)}_getDemuxer(){return this._demuxerPromise??=(async()=>{await this._mainReader.loadRange(0,4096);for(let e of this._formats)if(await e._canReadInput(this))return this._format=e,e._createDemuxer(this);throw new Error("Input has an unrecognizable format.")})()}async getFormat(){return await this._getDemuxer(),d(this._format),this._format}async computeDuration(){return(await this._getDemuxer()).computeDuration()}async getTracks(){return(await this._getDemuxer()).getTracks()}async getVideoTracks(){return(await this.getTracks()).filter(t=>t.isVideoTrack())}async getPrimaryVideoTrack(){return(await this.getTracks()).find(t=>t.isVideoTrack())??null}async getAudioTracks(){return(await this.getTracks()).filter(t=>t.isAudioTrack())}async getPrimaryAudioTrack(){return(await this.getTracks()).find(t=>t.isAudioTrack())??null}async getMimeType(){return(await this._getDemuxer()).getMimeType()}};var mt=class{async*chunks(e,t=1/0){let r=[],{promise:s,resolve:n}=G(),{promise:a,resolve:c}=G(),o=!1,u=[],m=()=>Math.max(2,u.length);(async()=>{let l=e??await this.getFirstChunk();for(;l&&!o&&!(l.timestamp/1e6>=t);){if(r.length>m()){({promise:a,resolve:c}=G()),await a;continue}r.push(l),n(),{promise:s,resolve:n}=G(),l=await this.getNextChunk(l)}o=!0,n()})();try{for(;;)if(r.length>0){yield r.shift();let l=performance.now();for(u.push(l);u.length>0&&l-u[0]>=1e3;)u.shift();c()}else if(!o)await s;else break}finally{o=!0,c()}}},dt=class{async getKeyMediaFrame(e){let t=null,r=await this.createDecoder(a=>t=a),n=await 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diff --git a/dist/metamuxer.min.mjs b/dist/metamuxer.min.mjs
index 082dad7..382fd3a 100644
--- a/dist/metamuxer.min.mjs
+++ b/dist/metamuxer.min.mjs
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0)throw new TypeError("Video chunk metadata decoder configuration for VP8/VP9 must include a colorSpace.")},Me=r=>{if(!r)throw new TypeError("Audio chunk metadata must be provided.");if(typeof r!="object")throw new TypeError("Audio chunk metadata must be an object.");if(!r.decoderConfig)throw new TypeError("Audio chunk metadata must include a decoder configuration.");if(typeof r.decoderConfig!="object")throw new TypeError("Audio chunk metadata decoder configuration must be an object.");if(typeof r.decoderConfig.codec!="string")throw new TypeError("Audio chunk metadata decoder configuration must specify a codec string.");if(!Number.isInteger(r.decoderConfig.sampleRate)||r.decoderConfig.sampleRate<=0)throw new TypeError("Audio chunk metadata decoder configuration must specify a valid sampleRate (positive integer).");if(!Number.isInteger(r.decoderConfig.numberOfChannels)||r.decoderConfig.numberOfChannels<=0)throw new TypeError("Audio chunk metadata decoder configuration must specify a 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TypeError("Subtitle metadata config must be an object.");if(typeof r.config.description!="string")throw new TypeError("Subtitle metadata config description must be a string.")};var Re=1e3,oi=2082844800,E=(r,e,t=!0)=>{let s=r*e;return t?Math.round(s):s},Pe=class extends ee{timestampsMustStartAtZero=!0;writer;boxWriter;fastStart;auxTarget=new pe;auxWriter=this.auxTarget._createWriter();auxBoxWriter=new de(this.auxWriter);ftypSize=null;mdat=null;trackDatas=[];creationTime=Math.floor(Date.now()/1e3)+oi;finalizedChunks=[];nextFragmentNumber=1;constructor(e,t){super(e),this.writer=e._writer,this.boxWriter=new de(this.writer);let s=this.writer instanceof te?"in-memory":!1;this.fastStart=t._options.fastStart??s,(this.fastStart==="in-memory"||this.fastStart==="fragmented")&&(this.writer.ensureMonotonicity=!0)}async start(){let e=await this.mutex.acquire(),t=this.output._tracks.some(s=>s.type==="video"&&s.source._codec==="avc");this.boxWriter.writeBox(Pt({holdsAvc:t,fragmented:this.fastStart==="fragmented"})),this.ftypSize=this.writer.getPos(),this.fastStart==="in-memory"?this.mdat=Ae(!1):this.fastStart==="fragmented"||(this.mdat=Ae(!0),this.boxWriter.writeBox(this.mdat)),await this.writer.flush(),e()}getVideoTrackData(e,t){let s=this.trackDatas.find(a=>a.track===e);if(s)return s;Fe(t),m(t),m(t.decoderConfig),m(t.decoderConfig.codedWidth!==void 0),m(t.decoderConfig.codedHeight!==void 0);let i={track:e,type:"video",info:{width:t.decoderConfig.codedWidth,height:t.decoderConfig.codedHeight,decoderConfig:t.decoderConfig},timescale:e.metadata.frameRate??57600,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[]};return this.trackDatas.push(i),this.trackDatas.sort((a,n)=>a.track.id-n.track.id),i}getAudioTrackData(e,t){let s=this.trackDatas.find(a=>a.track===e);if(s)return s;Me(t),m(t),m(t.decoderConfig);let i={track:e,type:"audio",info:{numberOfChannels:t.decoderConfig.numberOfChannels,sampleRate:t.decoderConfig.sampleRate,decoderConfig:t.decoderConfig},timescale:t.decoderConfig.sampleRate,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[]};return this.trackDatas.push(i),this.trackDatas.sort((a,n)=>a.track.id-n.track.id),i}getSubtitleTrackData(e,t){let s=this.trackDatas.find(a=>a.track===e);if(s)return s;ze(t),m(t),m(t.config);let i={track:e,type:"subtitle",info:{config:t.config},timescale:1e3,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[],lastCueEndTimestamp:0,cueQueue:[],nextSourceId:0,cueToSourceId:new WeakMap};return this.trackDatas.push(i),this.trackDatas.sort((a,n)=>a.track.id-n.track.id),this.validateAndNormalizeTimestamp(e,0,!0),i}async addEncodedVideoChunk(e,t,s){let i=await this.mutex.acquire();try{let a=this.getVideoTrackData(e,s),n=new Uint8Array(t.byteLength);t.copyTo(n);let c=this.validateAndNormalizeTimestamp(a.track,t.timestamp,t.type==="key"),o=this.createSampleForTrack(a,n,c,(t.duration??0)/1e6,t.type);await this.registerSample(a,o)}finally{i()}}async addEncodedAudioChunk(e,t,s){let i=await this.mutex.acquire();try{let a=this.getAudioTrackData(e,s),n=new Uint8Array(t.byteLength);t.copyTo(n);let c=t.type,o=this.validateAndNormalizeTimestamp(a.track,t.timestamp,c==="key"),u=this.createSampleForTrack(a,n,o,(t.duration??0)/1e6,c);await this.registerSample(a,u)}finally{i()}}async addSubtitleCue(e,t,s){let i=await this.mutex.acquire();try{let a=this.getSubtitleTrackData(e,s);this.validateAndNormalizeTimestamp(a.track,1e6*t.timestamp,!0),e.source._codec==="webvtt"&&(a.cueQueue.push(t),await this.processWebVTTCues(a,t.timestamp))}finally{i()}}async processWebVTTCues(e,t){for(;e.cueQueue.length>0;){let s=new Set([]);for(let u of e.cueQueue)m(u.timestamp<=t),m(e.lastCueEndTimestamp<=u.timestamp+u.duration),s.add(Math.max(u.timestamp,e.lastCueEndTimestamp)),s.add(u.timestamp+u.duration);let i=[...s].sort((u,d)=>u-d),a=i[0],n=i[1]??a;if(t<n)break;if(e.lastCueEndTimestamp<a){this.auxWriter.seek(0);let u=Nt();this.auxBoxWriter.writeBox(u);let d=this.auxWriter.getSlice(0,this.auxWriter.getPos()),l=this.createSampleForTrack(e,d,e.lastCueEndTimestamp,a-e.lastCueEndTimestamp,"key");await this.registerSample(e,l),e.lastCueEndTimestamp=a}this.auxWriter.seek(0);for(let u=0;u<e.cueQueue.length;u++){let d=e.cueQueue[u];if(d.timestamp>=n)break;J.lastIndex=0;let l=J.test(d.text),g=d.timestamp+d.duration,h=e.cueToSourceId.get(d);if(h===void 0&&n<g&&(h=e.nextSourceId++,e.cueToSourceId.set(d,h)),d.notes){let p=Ht(d.notes);this.auxBoxWriter.writeBox(p)}let b=Wt(d.text,l?a:null,d.identifier??null,d.settings??null,h??null);this.auxBoxWriter.writeBox(b),g===n&&e.cueQueue.splice(u--,1)}let c=this.auxWriter.getSlice(0,this.auxWriter.getPos()),o=this.createSampleForTrack(e,c,a,n-a,"key");await this.registerSample(e,o),e.lastCueEndTimestamp=n}}createSampleForTrack(e,t,s,i,a){return{timestamp:s,decodeTimestamp:s,duration:i,data:t,size:t.byteLength,type:a,timescaleUnitsToNextSample:E(i,e.timescale)}}processTimestamps(e){if(e.timestampProcessingQueue.length===0)return;let t=e.timestampProcessingQueue.map(s=>s.timestamp).sort((s,i)=>s-i);for(let s=0;s<e.timestampProcessingQueue.length;s++){let i=e.timestampProcessingQueue[s];i.decodeTimestamp=t[s];let a=E(i.timestamp-i.decodeTimestamp,e.timescale),n=E(i.duration,e.timescale);if(e.lastTimescaleUnits!==null){m(e.lastSample);let c=E(i.decodeTimestamp,e.timescale,!1),o=Math.round(c-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=o,e.lastSample.timescaleUnitsToNextSample=o,this.fastStart!=="fragmented"){let u=_(e.timeToSampleTable);if(m(u),u.sampleCount===1){u.sampleDelta=o;let l=e.timeToSampleTable[e.timeToSampleTable.length-2];l&&l.sampleDelta===o&&(l.sampleCount++,e.timeToSampleTable.pop(),u=l)}else u.sampleDelta!==o&&(u.sampleCount--,e.timeToSampleTable.push(u={sampleCount:1,sampleDelta:o}));u.sampleDelta===n?u.sampleCount++:e.timeToSampleTable.push({sampleCount:1,sampleDelta:n});let d=_(e.compositionTimeOffsetTable);m(d),d.sampleCompositionTimeOffset===a?d.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:a})}}else e.lastTimescaleUnits=0,this.fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:n}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:a}));e.lastSample=i}e.timestampProcessingQueue.length=0}async registerSample(e,t){this.fastStart==="fragmented"?(e.sampleQueue.push(t),await this.interleaveSamples()):await this.addSampleToTrack(e,t)}async addSampleToTrack(e,t){t.type==="key"&&this.processTimestamps(e),this.fastStart!=="fragmented"&&e.samples.push(t);let s=!1;if(!e.currentChunk)s=!0;else{let i=t.timestamp-e.currentChunk.startTimestamp;if(this.fastStart==="fragmented"){let a=this.trackDatas.every(n=>{if(e===n)return t.type==="key";let c=n.sampleQueue[0];return c&&c.type==="key"});i>=1&&a&&(s=!0,await this.finalizeFragment())}else s=i>=.5}s&&(e.currentChunk&&await 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e=null,t=1/0;for(let i of this.trackDatas){if(i.sampleQueue.length===0&&!i.track.source._closed)break e;i.sampleQueue.length>0&&i.sampleQueue[0].timestamp<t&&(e=i,t=i.sampleQueue[0].timestamp)}if(!e)break;let s=e.sampleQueue.shift();await this.addSampleToTrack(e,s)}}async finalizeFragment(e=!0){m(this.fastStart==="fragmented");let t=this.nextFragmentNumber++;if(t===1){let o=le(this.trackDatas,this.creationTime,!0);this.boxWriter.writeBox(o)}let s=this.trackDatas.filter(o=>o.currentChunk),i=this.writer.getPos(),a=et(t,s);this.boxWriter.writeBox(a);{let o=Ae(!1),u=0;for(let l of s)for(let g of l.currentChunk.samples)u+=g.size;let d=this.boxWriter.measureBox(o)+u;d>=2**32&&(o.largeSize=!0,d=this.boxWriter.measureBox(o)+u),o.size=d,this.boxWriter.writeBox(o)}for(let o of s){o.currentChunk.offset=this.writer.getPos(),o.currentChunk.moofOffset=i;for(let u of o.currentChunk.samples)this.writer.write(u.data),u.data=null}let n=this.writer.getPos();this.writer.seek(this.boxWriter.offsets.get(a));let c=et(t,s);this.boxWriter.writeBox(c),this.writer.seek(n);for(let o of s)o.finalizedChunks.push(o.currentChunk),this.finalizedChunks.push(o.currentChunk),o.currentChunk=null;e&&await this.writer.flush()}async onTrackClose(e){let t=await this.mutex.acquire();if(e.type==="subtitle"&&e.source._codec==="webvtt"){let s=this.trackDatas.find(i=>i.track===e);s&&await this.processWebVTTCues(s,1/0)}this.fastStart==="fragmented"&&await this.interleaveSamples(),t()}async finalize(){let e=await this.mutex.acquire();for(let t of this.trackDatas)t.type==="subtitle"&&t.track.source._codec==="webvtt"&&await this.processWebVTTCues(t,1/0);if(this.fastStart==="fragmented"){for(let t of this.trackDatas){for(let s of t.sampleQueue)await this.addSampleToTrack(t,s);this.processTimestamps(t)}await this.finalizeFragment(!1)}else for(let t of this.trackDatas)this.processTimestamps(t),await this.finalizeCurrentChunk(t);if(this.fastStart==="in-memory"){m(this.mdat);let t;for(let i=0;i<2;i++){let a=le(this.trackDatas,this.creationTime),n=this.boxWriter.measureBox(a);t=this.boxWriter.measureBox(this.mdat);let c=this.writer.getPos()+n+t;for(let o of this.finalizedChunks){o.offset=c;for(let{data:u}of o.samples)m(u),c+=u.byteLength,t+=u.byteLength}if(c<2**32)break;t>=2**32&&(this.mdat.largeSize=!0)}let s=le(this.trackDatas,this.creationTime);this.boxWriter.writeBox(s),this.mdat.size=t,this.boxWriter.writeBox(this.mdat);for(let i of this.finalizedChunks)for(let a of i.samples)m(a.data),this.writer.write(a.data),a.data=null}else if(this.fastStart==="fragmented"){let t=this.writer.getPos(),s=Bt(this.trackDatas);this.boxWriter.writeBox(s);let i=this.writer.getPos()-t;this.writer.seek(this.writer.getPos()-4),this.boxWriter.writeU32(i)}else{m(this.mdat),m(this.ftypSize!==null);let t=this.boxWriter.offsets.get(this.mdat);m(t!==void 0);let s=this.writer.getPos()-t;this.mdat.size=s,this.mdat.largeSize=s>=2**32,this.boxWriter.patchBox(this.mdat);let i=le(this.trackDatas,this.creationTime);if(typeof this.fastStart=="object"){this.writer.seek(this.ftypSize),this.boxWriter.writeBox(i);let a=t-this.writer.getPos();this.boxWriter.writeBox(Dt(a))}else this.boxWriter.writeBox(i)}e()}};var he=class{value;constructor(e){this.value=e}},se=class{value;constructor(e){this.value=e}},be=class{value;constructor(e){this.value=e}};var rt=r=>r<256?1:r<65536?2:r<1<<24?3:r<2**32?4:r<2**40?5:6,it=r=>r>=-64&&r<64?1:r>=-8192&&r<8192?2:r>=-(1<<20)&&r<1<<20?3:r>=-(1<<27)&&r<1<<27?4:r>=-(2**34)&&r<2**34?5:6,Jt=r=>{if(r<127)return 1;if(r<16383)return 2;if(r<(1<<21)-1)return 3;if(r<(1<<28)-1)return 4;if(r<2**35-1)return 5;if(r<2**42-1)return 6;throw new Error("EBML VINT size not supported "+r)};var st=2**15,er="https://github.com/Vanilagy/webm-muxer",tr=6,rr=5,ci={avc:"V_MPEG4/ISO/AVC",hevc:"V_MPEGH/ISO/HEVC",vp8:"V_VP8",vp9:"V_VP9",av1:"V_AV1",aac:"A_AAC",opus:"A_OPUS",webvtt:"S_TEXT/WEBVTT"},ui={video:1,audio:2,subtitle:17},De=class extends ee{timestampsMustStartAtZero=!1;writer;format;helper=new Uint8Array(8);helperView=new DataView(this.helper.buffer);offsets=new WeakMap;dataOffsets=new WeakMap;trackDatas=[];segment=null;segmentInfo=null;seekHead=null;tracksElement=null;segmentDuration=null;cues=null;currentCluster=null;currentClusterMsTimestamp=null;trackDatasInCurrentCluster=new 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pe{pos=0;target;sections=[];lastFlushEnd=0;writer=null;constructor(e){super(),this.target=e}start(){this.writer=this.target._writable.getWriter()}write(e){this.sections.push({data:e.slice(),start:this.pos}),this.pos+=e.byteLength}seek(e){this.pos=e}getPos(){return this.pos}async flush(){if(d(this.writer),this.sections.length===0)return;let e=[],t=[...this.sections].sort((r,s)=>r.start-s.start);e.push({start:t[0].start,size:t[0].data.byteLength});for(let r=1;r<t.length;r++){let s=e[e.length-1],n=t[r];n.start<=s.start+s.size?s.size=Math.max(s.size,n.start+n.data.byteLength-s.start):e.push({start:n.start,size:n.data.byteLength})}for(let r of e){r.data=new Uint8Array(r.size);for(let s of this.sections)r.start<=s.start&&s.start<r.start+r.size&&r.data.set(s.data,s.start-r.start);if(this.ensureMonotonicity&&r.start!==this.lastFlushEnd)throw new Error("Internal error: Monotonicity violation.");this.writer.desiredSize!==null&&this.writer.desiredSize<=0&&await this.writer.ready,this.writer.write({type:"write",data:r.data,position:r.start}),this.lastFlushEnd=r.start+r.data.byteLength}this.sections.length=0}finalize(){return d(this.writer),this.writer.close()}},di=2**24,li=2,Ee=class extends pe{pos=0;target;chunkSize;chunks=[];lastFlushEnd=0;writer=null;flushedChunkQueue=[];constructor(e){if(super(),this.target=e,this.chunkSize=e._options?.chunkSize??di,!Number.isInteger(this.chunkSize)||this.chunkSize<2**10)throw new Error("Invalid StreamTarget options: chunkSize must be an integer not smaller than 1024.")}start(){this.writer=this.target._writable.getWriter()}write(e){this.writeDataIntoChunks(e,this.pos),this.queueChunksForFlush(),this.pos+=e.byteLength}seek(e){this.pos=e}getPos(){return this.pos}writeDataIntoChunks(e,t){let r=this.chunks.findIndex(o=>o.start<=t&&t<o.start+this.chunkSize);r===-1&&(r=this.createChunk(t));let s=this.chunks[r],n=t-s.start,a=e.subarray(0,Math.min(this.chunkSize-n,e.byteLength));s.data.set(a,n);let c={start:n,end:n+a.byteLength};if(this.insertSectionIntoChunk(s,c),s.written[0].start===0&&s.written[0].end===this.chunkSize&&(s.shouldFlush=!0),this.chunks.length>li){for(let o=0;o<this.chunks.length-1;o++)this.chunks[o].shouldFlush=!0;this.queueChunksForFlush()}a.byteLength<e.byteLength&&this.writeDataIntoChunks(e.subarray(a.byteLength),t+a.byteLength)}insertSectionIntoChunk(e,t){let r=0,s=e.written.length-1,n=-1;for(;r<=s;){let a=Math.floor(r+(s-r+1)/2);e.written[a].start<=t.start?(r=a+1,n=a):s=a-1}for(e.written.splice(n+1,0,t),(n===-1||e.written[n].end<t.start)&&n++;n<e.written.length-1&&e.written[n].end>=e.written[n+1].start;)e.written[n].end=Math.max(e.written[n].end,e.written[n+1].end),e.written.splice(n+1,1)}createChunk(e){let r={start:Math.floor(e/this.chunkSize)*this.chunkSize,data:new Uint8Array(this.chunkSize),written:[],shouldFlush:!1};return this.chunks.push(r),this.chunks.sort((s,n)=>s.start-n.start),this.chunks.indexOf(r)}queueChunksForFlush(e=!1){d(this.writer);for(let t=0;t<this.chunks.length;t++){let r=this.chunks[t];if(!(!r.shouldFlush&&!e)){for(let s of r.written){if(this.ensureMonotonicity&&r.start+s.start!==this.lastFlushEnd)throw new Error("Internal error: Monotonicity violation.");this.flushedChunkQueue.push({type:"write",data:r.data.subarray(s.start,s.end),position:r.start+s.start}),this.lastFlushEnd=r.start+s.end}this.chunks.splice(t--,1)}}}async flush(){if(d(this.writer),this.flushedChunkQueue.length!==0){for(let e of this.flushedChunkQueue)this.writer.desiredSize!==null&&this.writer.desiredSize<=0&&await this.writer.ready,this.writer.write(e);this.flushedChunkQueue.length=0}}async finalize(){return d(this.writer),this.queueChunksForFlush(!0),await this.flush(),this.writer.close()}};var G=class{_output=null},he=class extends G{buffer=null;_createWriter(){return new re(this)}},nt=class extends G{_writable;_options;constructor(e,t={}){if(super(),!(e instanceof WritableStream))throw new TypeError("StreamTarget requires a WritableStream 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le(this.auxWriter);ftypSize=null;mdat=null;trackDatas=[];creationTime=Math.floor(Date.now()/1e3)+fi;finalizedChunks=[];nextFragmentNumber=1;constructor(e,t){super(e),this.writer=e._writer,this.boxWriter=new le(this.writer);let r=this.writer instanceof re?"in-memory":!1;this.fastStart=t._options.fastStart??r,(this.fastStart==="in-memory"||this.fastStart==="fragmented")&&(this.writer.ensureMonotonicity=!0)}async start(){let e=await this.mutex.acquire(),t=this.output._tracks.some(r=>r.type==="video"&&r.source._codec==="avc");this.boxWriter.writeBox(Ht({holdsAvc:t,fragmented:this.fastStart==="fragmented"})),this.ftypSize=this.writer.getPos(),this.fastStart==="in-memory"?this.mdat=Oe(!1):this.fastStart==="fragmented"||(this.mdat=Oe(!0),this.boxWriter.writeBox(this.mdat)),await this.writer.flush(),e()}getVideoTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Me(t),d(t),d(t.decoderConfig),d(t.decoderConfig.codedWidth!==void 0),d(t.decoderConfig.codedHeight!==void 0);let s={track:e,type:"video",info:{width:t.decoderConfig.codedWidth,height:t.decoderConfig.codedHeight,decoderConfig:t.decoderConfig},timescale:e.metadata.frameRate??57600,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[]};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getAudioTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Ve(t),d(t),d(t.decoderConfig);let s={track:e,type:"audio",info:{numberOfChannels:t.decoderConfig.numberOfChannels,sampleRate:t.decoderConfig.sampleRate,decoderConfig:t.decoderConfig},timescale:t.decoderConfig.sampleRate,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[]};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getSubtitleTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Pe(t),d(t),d(t.config);let s={track:e,type:"subtitle",info:{config:t.config},timescale:1e3,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[],lastCueEndTimestamp:0,cueQueue:[],nextSourceId:0,cueToSourceId:new WeakMap};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),this.validateAndNormalizeTimestamp(e,0,!0),s}async addEncodedVideoChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getVideoTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=this.validateAndNormalizeTimestamp(n.track,t.timestamp,t.type==="key"),o=this.createSampleForTrack(n,a,c,(t.duration??0)/1e6,t.type);await this.registerSample(n,o)}finally{s()}}async addEncodedAudioChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getAudioTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=t.type,o=this.validateAndNormalizeTimestamp(n.track,t.timestamp,c==="key"),u=this.createSampleForTrack(n,a,o,(t.duration??0)/1e6,c);await this.registerSample(n,u)}finally{s()}}async addSubtitleCue(e,t,r){let s=await this.mutex.acquire();try{let n=this.getSubtitleTrackData(e,r);this.validateAndNormalizeTimestamp(n.track,1e6*t.timestamp,!0),e.source._codec==="webvtt"&&(n.cueQueue.push(t),await this.processWebVTTCues(n,t.timestamp))}finally{s()}}async processWebVTTCues(e,t){for(;e.cueQueue.length>0;){let r=new Set([]);for(let u of e.cueQueue)d(u.timestamp<=t),d(e.lastCueEndTimestamp<=u.timestamp+u.duration),r.add(Math.max(u.timestamp,e.lastCueEndTimestamp)),r.add(u.timestamp+u.duration);let s=[...r].sort((u,m)=>u-m),n=s[0],a=s[1]??n;if(t<a)break;if(e.lastCueEndTimestamp<n){this.auxWriter.seek(0);let u=Qt();this.auxBoxWriter.writeBox(u);let m=this.auxWriter.getSlice(0,this.auxWriter.getPos()),l=this.createSampleForTrack(e,m,e.lastCueEndTimestamp,n-e.lastCueEndTimestamp,"key");await this.registerSample(e,l),e.lastCueEndTimestamp=n}this.auxWriter.seek(0);for(let u=0;u<e.cueQueue.length;u++){let m=e.cueQueue[u];if(m.timestamp>=a)break;ee.lastIndex=0;let l=ee.test(m.text),p=m.timestamp+m.duration,h=e.cueToSourceId.get(m);if(h===void 0&&a<p&&(h=e.nextSourceId++,e.cueToSourceId.set(m,h)),m.notes){let k=qt(m.notes);this.auxBoxWriter.writeBox(k)}let b=jt(m.text,l?n:null,m.identifier??null,m.settings??null,h??null);this.auxBoxWriter.writeBox(b),p===a&&e.cueQueue.splice(u--,1)}let c=this.auxWriter.getSlice(0,this.auxWriter.getPos()),o=this.createSampleForTrack(e,c,n,a-n,"key");await this.registerSample(e,o),e.lastCueEndTimestamp=a}}createSampleForTrack(e,t,r,s,n){return{timestamp:r,decodeTimestamp:r,duration:s,data:t,size:t.byteLength,type:n,timescaleUnitsToNextSample:V(s,e.timescale)}}processTimestamps(e){if(e.timestampProcessingQueue.length===0)return;let t=e.timestampProcessingQueue.map(r=>r.timestamp).sort((r,s)=>r-s);for(let r=0;r<e.timestampProcessingQueue.length;r++){let s=e.timestampProcessingQueue[r];s.decodeTimestamp=t[r];let n=V(s.timestamp-s.decodeTimestamp,e.timescale),a=V(s.duration,e.timescale);if(e.lastTimescaleUnits!==null){d(e.lastSample);let c=V(s.decodeTimestamp,e.timescale,!1),o=Math.round(c-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=o,e.lastSample.timescaleUnitsToNextSample=o,this.fastStart!=="fragmented"){let u=A(e.timeToSampleTable);if(d(u),u.sampleCount===1){u.sampleDelta=o;let l=e.timeToSampleTable[e.timeToSampleTable.length-2];l&&l.sampleDelta===o&&(l.sampleCount++,e.timeToSampleTable.pop(),u=l)}else u.sampleDelta!==o&&(u.sampleCount--,e.timeToSampleTable.push(u={sampleCount:1,sampleDelta:o}));u.sampleDelta===a?u.sampleCount++:e.timeToSampleTable.push({sampleCount:1,sampleDelta:a});let m=A(e.compositionTimeOffsetTable);d(m),m.sampleCompositionTimeOffset===n?m.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:n})}}else e.lastTimescaleUnits=0,this.fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:a}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:n}));e.lastSample=s}e.timestampProcessingQueue.length=0}async registerSample(e,t){this.fastStart==="fragmented"?(e.sampleQueue.push(t),await this.interleaveSamples()):await this.addSampleToTrack(e,t)}async addSampleToTrack(e,t){t.type==="key"&&this.processTimestamps(e),this.fastStart!=="fragmented"&&e.samples.push(t);let r=!1;if(!e.currentChunk)r=!0;else{let s=t.timestamp-e.currentChunk.startTimestamp;if(this.fastStart==="fragmented"){let n=this.trackDatas.every(a=>{if(e===a)return t.type==="key";let c=a.sampleQueue[0];return c&&c.type==="key"});s>=1&&n&&(r=!0,await this.finalizeFragment())}else r=s>=.5}r&&(e.currentChunk&&await this.finalizeCurrentChunk(e),e.currentChunk={startTimestamp:t.timestamp,samples:[],offset:null,moofOffset:null}),d(e.currentChunk),e.currentChunk.samples.push(t),e.timestampProcessingQueue.push(t)}async finalizeCurrentChunk(e){if(d(this.fastStart!=="fragmented"),!!e.currentChunk){if(e.finalizedChunks.push(e.currentChunk),this.finalizedChunks.push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||A(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),this.fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=this.writer.getPos();for(let t of e.currentChunk.samples)d(t.data),this.writer.write(t.data),t.data=null;await this.writer.flush()}}async interleaveSamples(){d(this.fastStart==="fragmented");for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let s of this.trackDatas){if(s.sampleQueue.length===0&&!s.track.source._closed)break e;s.sampleQueue.length>0&&s.sampleQueue[0].timestamp<t&&(e=s,t=s.sampleQueue[0].timestamp)}if(!e)break;let r=e.sampleQueue.shift();await this.addSampleToTrack(e,r)}}async finalizeFragment(e=!0){d(this.fastStart==="fragmented");let t=this.nextFragmentNumber++;if(t===1){let o=fe(this.trackDatas,this.creationTime,!0);this.boxWriter.writeBox(o)}let r=this.trackDatas.filter(o=>o.currentChunk),s=this.writer.getPos(),n=st(t,r);this.boxWriter.writeBox(n);{let o=Oe(!1),u=0;for(let l of r)for(let p of l.currentChunk.samples)u+=p.size;let m=this.boxWriter.measureBox(o)+u;m>=2**32&&(o.largeSize=!0,m=this.boxWriter.measureBox(o)+u),o.size=m,this.boxWriter.writeBox(o)}for(let o of r){o.currentChunk.offset=this.writer.getPos(),o.currentChunk.moofOffset=s;for(let u of o.currentChunk.samples)this.writer.write(u.data),u.data=null}let a=this.writer.getPos();this.writer.seek(this.boxWriter.offsets.get(n));let c=st(t,r);this.boxWriter.writeBox(c),this.writer.seek(a);for(let o of r)o.finalizedChunks.push(o.currentChunk),this.finalizedChunks.push(o.currentChunk),o.currentChunk=null;e&&await this.writer.flush()}async onTrackClose(e){let t=await this.mutex.acquire();if(e.type==="subtitle"&&e.source._codec==="webvtt"){let r=this.trackDatas.find(s=>s.track===e);r&&await this.processWebVTTCues(r,1/0)}this.fastStart==="fragmented"&&await this.interleaveSamples(),t()}async finalize(){let e=await this.mutex.acquire();for(let t of this.trackDatas)t.type==="subtitle"&&t.track.source._codec==="webvtt"&&await this.processWebVTTCues(t,1/0);if(this.fastStart==="fragmented"){for(let t of this.trackDatas){for(let r of t.sampleQueue)await this.addSampleToTrack(t,r);this.processTimestamps(t)}await this.finalizeFragment(!1)}else for(let t of this.trackDatas)this.processTimestamps(t),await this.finalizeCurrentChunk(t);if(this.fastStart==="in-memory"){d(this.mdat);let t;for(let s=0;s<2;s++){let n=fe(this.trackDatas,this.creationTime),a=this.boxWriter.measureBox(n);t=this.boxWriter.measureBox(this.mdat);let c=this.writer.getPos()+a+t;for(let o of this.finalizedChunks){o.offset=c;for(let{data:u}of o.samples)d(u),c+=u.byteLength,t+=u.byteLength}if(c<2**32)break;t>=2**32&&(this.mdat.largeSize=!0)}let r=fe(this.trackDatas,this.creationTime);this.boxWriter.writeBox(r),this.mdat.size=t,this.boxWriter.writeBox(this.mdat);for(let s of this.finalizedChunks)for(let n of s.samples)d(n.data),this.writer.write(n.data),n.data=null}else if(this.fastStart==="fragmented"){let t=this.writer.getPos(),r=$t(this.trackDatas);this.boxWriter.writeBox(r);let s=this.writer.getPos()-t;this.writer.seek(this.writer.getPos()-4),this.boxWriter.writeU32(s)}else{d(this.mdat),d(this.ftypSize!==null);let t=this.boxWriter.offsets.get(this.mdat);d(t!==void 0);let r=this.writer.getPos()-t;this.mdat.size=r,this.mdat.largeSize=r>=2**32,this.boxWriter.patchBox(this.mdat);let s=fe(this.trackDatas,this.creationTime);if(typeof this.fastStart=="object"){this.writer.seek(this.ftypSize),this.boxWriter.writeBox(s);let n=t-this.writer.getPos();this.boxWriter.writeBox(Lt(n))}else this.boxWriter.writeBox(s)}e()}};var be=class{value;constructor(e){this.value=e}},ne=class{value;constructor(e){this.value=e}},ke=class{value;constructor(e){this.value=e}};var ot=i=>i<256?1:i<65536?2:i<1<<24?3:i<2**32?4:i<2**40?5:6,ct=i=>i>=-64&&i<64?1:i>=-8192&&i<8192?2:i>=-(1<<20)&&i<1<<20?3:i>=-(1<<27)&&i<1<<27?4:i>=-(2**34)&&i<2**34?5:6,nr=i=>{if(i<127)return 1;if(i<16383)return 2;if(i<(1<<21)-1)return 3;if(i<(1<<28)-1)return 4;if(i<2**35-1)return 5;if(i<2**42-1)return 6;throw new Error("EBML VINT size not supported "+i)};var ut=2**15,ar="https://github.com/Vanilagy/webm-muxer",or=6,cr=5,pi={avc:"V_MPEG4/ISO/AVC",hevc:"V_MPEGH/ISO/HEVC",vp8:"V_VP8",vp9:"V_VP9",av1:"V_AV1",aac:"A_AAC",opus:"A_OPUS",webvtt:"S_TEXT/WEBVTT"},hi={video:1,audio:2,subtitle:17},ze=class extends te{timestampsMustStartAtZero=!1;writer;format;helper=new Uint8Array(8);helperView=new DataView(this.helper.buffer);offsets=new WeakMap;dataOffsets=new WeakMap;trackDatas=[];segment=null;segmentInfo=null;seekHead=null;tracksElement=null;segmentDuration=null;cues=null;currentCluster=null;currentClusterMsTimestamp=null;trackDatasInCurrentCluster=new Set;duration=0;constructor(e,t){super(e),this.writer=e._writer,this.format=t,this.format._options.streamable&&(this.writer.ensureMonotonicity=!0)}writeByte(e){this.helperView.setUint8(0,e),this.writer.write(this.helper.subarray(0,1))}writeFloat32(e){this.helperView.setFloat32(0,e,!1),this.writer.write(this.helper.subarray(0,4))}writeFloat64(e){this.helperView.setFloat64(0,e,!1),this.writer.write(this.helper)}writeUnsignedInt(e,t=ot(e)){let r=0;switch(t){case 6:this.helperView.setUint8(r++,e/2**40|0);case 5:this.helperView.setUint8(r++,e/2**32|0);case 4:this.helperView.setUint8(r++,e>>24);case 3:this.helperView.setUint8(r++,e>>16);case 2:this.helperView.setUint8(r++,e>>8);case 1:this.helperView.setUint8(r++,e);break;default:throw new Error("Bad UINT size "+t)}this.writer.write(this.helper.subarray(0,r))}writeSignedInt(e,t=ct(e)){e<0&&(e+=2**(t*8)),this.writeUnsignedInt(e,t)}writeEBMLVarInt(e,t=nr(e)){let r=0;switch(t){case 1:this.helperView.setUint8(r++,128|e);break;case 2:this.helperView.setUint8(r++,64|e>>8),this.helperView.setUint8(r++,e);break;case 3:this.helperView.setUint8(r++,32|e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;case 4:this.helperView.setUint8(r++,16|e>>24),this.helperView.setUint8(r++,e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;case 5:this.helperView.setUint8(r++,8|e/2**32&7),this.helperView.setUint8(r++,e>>24),this.helperView.setUint8(r++,e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;case 6:this.helperView.setUint8(r++,4|e/2**40&3),this.helperView.setUint8(r++,e/2**32|0),this.helperView.setUint8(r++,e>>24),this.helperView.setUint8(r++,e>>16),this.helperView.setUint8(r++,e>>8),this.helperView.setUint8(r++,e);break;default:throw new Error("Bad EBML VINT size "+t)}this.writer.write(this.helper.subarray(0,r))}writeString(e){this.writer.write(new Uint8Array(e.split("").map(t=>t.charCodeAt(0))))}writeEBML(e){if(e!==null){if(e instanceof Uint8Array)this.writer.write(e);else if(Array.isArray(e))for(let t of e)this.writeEBML(t);else if(this.offsets.set(e,this.writer.getPos()),this.writeUnsignedInt(e.id),Array.isArray(e.data)){let t=this.writer.getPos(),r=e.size===-1?1:e.size??4;e.size===-1?this.writeByte(255):this.writer.seek(this.writer.getPos()+r);let s=this.writer.getPos();if(this.dataOffsets.set(e,s),this.writeEBML(e.data),e.size!==-1){let n=this.writer.getPos()-s,a=this.writer.getPos();this.writer.seek(t),this.writeEBMLVarInt(n,r),this.writer.seek(a)}}else if(typeof e.data=="number"){let t=e.size??ot(e.data);this.writeEBMLVarInt(t),this.writeUnsignedInt(e.data,t)}else if(typeof e.data=="string")this.writeEBMLVarInt(e.data.length),this.writeString(e.data);else if(e.data instanceof Uint8Array)this.writeEBMLVarInt(e.data.byteLength,e.size),this.writer.write(e.data);else if(e.data instanceof be)this.writeEBMLVarInt(4),this.writeFloat32(e.data.value);else if(e.data instanceof ne)this.writeEBMLVarInt(8),this.writeFloat64(e.data.value);else if(e.data instanceof ke){let t=e.size??ct(e.data.value);this.writeEBMLVarInt(t),this.writeSignedInt(e.data.value,t)}}}beforeTrackAdd(e){if(this.format instanceof ae)if(e.type==="video"){if(!["vp8","vp9","av1"].includes(e.source._codec))throw new Error("WebM only supports VP8, VP9 and AV1 as video codecs. Switching to MKV removes this restriction.")}else if(e.type==="audio"){if(!["opus","vorbis"].includes(e.source._codec))throw new Error("WebM only supports Opus and Vorbis as audio codecs. Switching to MKV removes this restriction.")}else if(e.type==="subtitle"){if(e.source._codec!=="webvtt")throw new Error("WebM only supports WebVTT as subtitle codec. Switching to MKV removes this restriction.")}else throw new Error("WebM only supports video, audio and subtitle tracks. Switching to MKV removes this restriction.")}async start(){let e=await this.mutex.acquire();this.writeEBMLHeader(),this.format._options.streamable||this.createSeekHead(),this.createSegmentInfo(),this.createCues(),await this.writer.flush(),e()}writeEBMLHeader(){let e={id:440786851,data:[{id:17030,data:1},{id:17143,data:1},{id:17138,data:4},{id:17139,data:8},{id:17026,data:this.format instanceof ae?"webm":"matroska"},{id:17031,data:2},{id:17029,data:2}]};this.writeEBML(e)}createSeekHead(){let e=new Uint8Array([28,83,187,107]),t=new Uint8Array([21,73,169,102]),r=new Uint8Array([22,84,174,107]),s={id:290298740,data:[{id:19899,data:[{id:21419,data:e},{id:21420,size:5,data:0}]},{id:19899,data:[{id:21419,data:t},{id:21420,size:5,data:0}]},{id:19899,data:[{id:21419,data:r},{id:21420,size:5,data:0}]}]};this.seekHead=s}createSegmentInfo(){let e={id:17545,data:new ne(0)};this.segmentDuration=e;let t={id:357149030,data:[{id:2807729,data:1e6},{id:19840,data:ar},{id:22337,data:ar},this.format._options.streamable?null:e]};this.segmentInfo=t}createTracks(){let e={id:374648427,data:[]};this.tracksElement=e;for(let t of this.trackDatas)e.data.push({id:174,data:[{id:215,data:t.track.id},{id:29637,data:t.track.id},{id:131,data:hi[t.type]},{id:134,data:pi[t.track.source._codec]},t.type==="video"?this.videoSpecificTrackInfo(t):null,t.type==="audio"?this.audioSpecificTrackInfo(t):null,t.type==="subtitle"?this.subtitleSpecificTrackInfo(t):null]})}videoSpecificTrackInfo(e){let t=[e.info.decoderConfig.description?{id:25506,data:K(e.info.decoderConfig.description)}:null,e.track.metadata.frameRate?{id:2352003,data:1e9/e.track.metadata.frameRate}:null],r=e.info.decoderConfig.colorSpace,s={id:224,data:[{id:176,data:e.info.width},{id:186,data:e.info.height},ye(r)?{id:21936,data:[{id:21937,data:j[r.matrix]},{id:21946,data:Q[r.transfer]},{id:21947,data:$[r.primaries]},{id:21945,data:r.fullRange?2:1}]}:null]};return t.push(s),t}audioSpecificTrackInfo(e){return[e.info.decoderConfig.description?{id:25506,data:K(e.info.decoderConfig.description)}:null,{id:225,data:[{id:181,data:new be(e.info.sampleRate)},{id:159,data:e.info.numberOfChannels}]}]}subtitleSpecificTrackInfo(e){return[{id:25506,data:M.encode(e.info.config.description)}]}createSegment(){let e={id:408125543,size:this.format._options.streamable?-1:or,data:[this.format._options.streamable?null:this.seekHead,this.segmentInfo,this.tracksElement]};this.segment=e,this.writeEBML(e)}createCues(){this.cues={id:475249515,data:[]}}get segmentDataOffset(){return d(this.segment),this.dataOffsets.get(this.segment)}getVideoTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Me(t),d(t),d(t.decoderConfig),d(t.decoderConfig.codedWidth!==void 0),d(t.decoderConfig.codedHeight!==void 0);let s={track:e,type:"video",info:{width:t.decoderConfig.codedWidth,height:t.decoderConfig.codedHeight,decoderConfig:t.decoderConfig},chunkQueue:[],lastWrittenMsTimestamp:null};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getAudioTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Ve(t),d(t),d(t.decoderConfig);let s={track:e,type:"audio",info:{numberOfChannels:t.decoderConfig.numberOfChannels,sampleRate:t.decoderConfig.sampleRate,decoderConfig:t.decoderConfig},chunkQueue:[],lastWrittenMsTimestamp:null};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}getSubtitleTrackData(e,t){let r=this.trackDatas.find(n=>n.track===e);if(r)return r;Pe(t),d(t),d(t.config);let s={track:e,type:"subtitle",info:{config:t.config},chunkQueue:[],lastWrittenMsTimestamp:null};return this.trackDatas.push(s),this.trackDatas.sort((n,a)=>n.track.id-a.track.id),s}async addEncodedVideoChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getVideoTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=t.type==="key",o=this.validateAndNormalizeTimestamp(n.track,t.timestamp,c),u=this.createInternalChunk(a,o,(t.duration??0)/1e6,t.type);e.source._codec==="vp9"&&this.fixVP9ColorSpace(n,u),n.chunkQueue.push(u),await this.interleaveChunks()}finally{s()}}async addEncodedAudioChunk(e,t,r){let s=await this.mutex.acquire();try{let n=this.getAudioTrackData(e,r),a=new Uint8Array(t.byteLength);t.copyTo(a);let c=t.type,o=c==="key",u=this.validateAndNormalizeTimestamp(n.track,t.timestamp,o),m=this.createInternalChunk(a,u,(t.duration??0)/1e6,c);n.chunkQueue.push(m),await this.interleaveChunks()}finally{s()}}async addSubtitleCue(e,t,r){let s=await this.mutex.acquire();try{let n=this.getSubtitleTrackData(e,r),a=this.validateAndNormalizeTimestamp(n.track,1e6*t.timestamp,!0),c=t.text,o=Math.floor(a*1e3);ee.lastIndex=0,c=c.replace(ee,p=>{let b=Ie(p.slice(1,-1))-o;return`<${Ae(b)}>`});let u=M.encode(c),m=`${t.settings??""}
 ${t.identifier??""}
-${t.notes??""}`,l=this.createInternalChunk(u,n,t.duration,"key",d.trim()?O.encode(d):null);a.chunkQueue.push(l),await this.interleaveChunks()}finally{i()}}async interleaveChunks(){for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let i of this.trackDatas){if(i.chunkQueue.length===0&&!i.track.source._closed)break e;i.chunkQueue.length>0&&i.chunkQueue[0].timestamp<t&&(e=i,t=i.chunkQueue[0].timestamp)}if(!e)break;let s=e.chunkQueue.shift();this.writeBlock(e,s)}await this.writer.flush()}fixVP9ColorSpace(e,t){if(t.type!=="key"||!e.info.decoderConfig.colorSpace||!e.info.decoderConfig.colorSpace.matrix)return;let s=0;if(H(t.data,0,2)!==2)return;s+=2;let i=(H(t.data,s+1,s+2)<<1)+H(t.data,s+0,s+1);s+=2,i===3&&s++;let a=H(t.data,s+0,s+1);if(s++,a)return;let n=H(t.data,s+0,s+1);if(s++,n!==0)return;s+=2;let c=H(t.data,s+0,s+24);if(s+=24,c!==4817730)return;i>=2&&s++;let o={rgb:7,bt709:2,bt470bg:1,smpte170m:3}[e.info.decoderConfig.colorSpace.matrix];vt(t.data,s+0,s+3,o)}createInternalChunk(e,t,s,i,a=null){return{data:e,type:i,timestamp:t,duration:s,additions:a}}writeBlock(e,t){this.segment||(this.createTracks(),this.createSegment());let s=Math.floor(1e3*t.timestamp),i=this.trackDatas.every(d=>{if(d.track.source._closed)return!0;if(e===d)return t.type==="key";let l=d.chunkQueue[0];return l&&l.type==="key"});(!this.currentCluster||i&&s-this.currentClusterMsTimestamp>=1e3)&&this.createNewCluster(s);let a=s-this.currentClusterMsTimestamp;if(a<0)return;if(a>=st)throw new Error(`Current Matroska cluster exceeded its maximum allowed length of ${st} milliseconds. In order to produce a correct WebM file, you must pass in a key frame at least every ${st} milliseconds.`);let c=new Uint8Array(4),o=new DataView(c.buffer);o.setUint8(0,128|e.track.id),o.setInt16(1,a,!1);let u=Math.floor(1e3*t.duration);if(u===0&&!t.additions){o.setUint8(3,+(t.type==="key")<<7);let d={id:163,data:[c,t.data]};this.writeEBML(d)}else{let d={id:160,data:[{id:161,data:[c,t.data]},t.type==="delta"?{id:251,data:new be(e.lastWrittenMsTimestamp-s)}:null,t.additions?{id:30113,data:[{id:166,data:[{id:165,data:t.additions},{id:238,data:1}]}]}:null,u>0?{id:155,data:u}:null]};this.writeEBML(d)}this.duration=Math.max(this.duration,s+u),e.lastWrittenMsTimestamp=s,this.trackDatasInCurrentCluster.add(e)}createNewCluster(e){this.currentCluster&&!this.format._options.streamable&&this.finalizeCurrentCluster(),this.currentCluster={id:524531317,size:this.format._options.streamable?-1:rr,data:[{id:231,data:e}]},this.writeEBML(this.currentCluster),this.currentClusterMsTimestamp=e,this.trackDatasInCurrentCluster.clear()}finalizeCurrentCluster(){m(this.currentCluster);let e=this.writer.getPos()-this.dataOffsets.get(this.currentCluster),t=this.writer.getPos();this.writer.seek(this.offsets.get(this.currentCluster)+4),this.writeEBMLVarInt(e,rr),this.writer.seek(t);let s=this.offsets.get(this.currentCluster)-this.segmentDataOffset;m(this.cues),this.cues.data.push({id:187,data:[{id:179,data:this.currentClusterMsTimestamp},...[...this.trackDatasInCurrentCluster].map(i=>({id:183,data:[{id:247,data:i.track.id},{id:241,data:s}]}))]})}async onTrackClose(){let e=await this.mutex.acquire();await this.interleaveChunks(),e()}async finalize(){let e=await this.mutex.acquire();this.segment||(this.createTracks(),this.createSegment());for(let t of this.trackDatas)for(;t.chunkQueue.length>0;)this.writeBlock(t,t.chunkQueue.shift());if(!this.format._options.streamable&&this.currentCluster&&this.finalizeCurrentCluster(),m(this.cues),this.writeEBML(this.cues),!this.format._options.streamable){let t=this.writer.getPos(),s=this.writer.getPos()-this.segmentDataOffset;this.writer.seek(this.offsets.get(this.segment)+4),this.writeEBMLVarInt(s,tr),this.segmentDuration.data=new se(this.duration),this.writer.seek(this.offsets.get(this.segmentDuration)),this.writeEBML(this.segmentDuration),this.seekHead.data[0].data[1].data=this.offsets.get(this.cues)-this.segmentDataOffset,this.seekHead.data[1].data[1].data=this.offsets.get(this.segmentInfo)-this.segmentDataOffset,this.seekHead.data[2].data[1].data=this.offsets.get(this.tracksElement)-this.segmentDataOffset,this.writer.seek(this.offsets.get(this.seekHead)),this.writeEBML(this.seekHead),this.writer.seek(t)}e()}};var G=class{},at=class extends G{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.fastStart!==void 0&&![!1,"in-memory","fragmented"].includes(e.fastStart))throw new TypeError('options.fastStart, when provided, must be false, "in-memory", or "fragmented".');super(),this._options=e}_createMuxer(e){return new Pe(e,this)}},Ue=class extends G{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.streamable!==void 0&&typeof e.streamable!="boolean")throw new TypeError("options.streamable, when provided, must be a boolean.");super(),this._options=e}_createMuxer(e){return new De(e,this)}},ae=class extends Ue{};var ne=class{_connectedTrack=null;_closed=!1;_offsetTimestamps=!1;_ensureValidDigest(){if(!this._connectedTrack)throw new Error("Cannot call digest without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call digest before output has been started.");if(this._connectedTrack.output._finalizing)throw new Error("Cannot call digest after output has started finalizing.");if(this._closed)throw new Error("Cannot call digest after source has been closed.")}_start(){}async _flush(){}close(){if(this._closed)throw new Error("Source already closed.");if(!this._connectedTrack)throw new Error("Cannot call close without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call close before output has been started.");this._closed=!0,!this._connectedTrack.output._finalizing&&this._connectedTrack.output._muxer.onTrackClose(this._connectedTrack)}},P=class extends ne{_connectedTrack=null;_codec;constructor(e){if(super(),!re.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${re.join(", ")}.`);this._codec=e}},nt=class extends P{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},mi=5,di=r=>{if(!r||typeof r!="object")throw new TypeError("Codec config must be an object.");if(!re.includes(r.codec))throw new TypeError(`Invalid video codec '${r.codec}'. Must be one of: ${re.join(", ")}.`);if(!Number.isInteger(r.bitrate)||r.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.");if(r.latencyMode!==void 0&&!["quality","realtime"].includes(r.latencyMode))throw new TypeError("config.latencyMode, when provided, must be 'quality' or 'realtime'.")},ge=class{constructor(e,t){this.source=e;this.codecConfig=t;di(t)}encoder=null;muxer=null;lastMultipleOfKeyFrameInterval=-1;lastWidth=null;lastHeight=null;async digest(e){if(this.source._ensureValidDigest(),this.lastWidth!==null&&this.lastHeight!==null){if(e.codedWidth!==this.lastWidth||e.codedHeight!==this.lastHeight)throw new Error(`Video frame size must remain constant. Expected ${this.lastWidth}x${this.lastHeight}, got ${e.codedWidth}x${e.codedHeight}.`)}else this.lastWidth=e.codedWidth,this.lastHeight=e.codedHeight;this.ensureEncoder(e),m(this.encoder);let t=Math.floor(e.timestamp/1e6/mi);this.encoder.encode(e,{keyFrame:t!==this.lastMultipleOfKeyFrameInterval}),this.lastMultipleOfKeyFrameInterval=t,this.encoder.encodeQueueSize>=4&&await new Promise(s=>this.encoder.addEventListener("dequeue",s,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new VideoEncoder({output:(t,s)=>void this.muxer.addEncodedVideoChunk(this.source._connectedTrack,t,s),error:t=>console.error("Video encode error:",t)}),this.encoder.configure({codec:jt(this.codecConfig.codec,e.codedWidth,e.codedHeight,this.codecConfig.bitrate),width:e.codedWidth,height:e.codedHeight,bitrate:this.codecConfig.bitrate,framerate:this.source._connectedTrack?.metadata.frameRate,latencyMode:this.codecConfig.latencyMode,...Yt(this.codecConfig.codec)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},ot=class extends P{_encoder;constructor(e){super(e.codec),this._encoder=new ge(this,e)}digest(e){if(!(e instanceof VideoFrame))throw new TypeError("videoFrame must be a VideoFrame.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},ct=class extends P{_encoder;_canvas;constructor(e,t){if(!(e instanceof HTMLCanvasElement))throw new TypeError("canvas must be an HTMLCanvasElement.");super(t.codec),this._encoder=new ge(this,t),this._canvas=e}digest(e,t=0){if(!Number.isFinite(e)||e<0)throw new TypeError("timestamp must be a non-negative number.");if(!Number.isFinite(t)||t<0)throw new TypeError("duration must be a non-negative number.");let s=new VideoFrame(this._canvas,{timestamp:Math.round(1e6*e),duration:Math.round(1e6*t),alpha:"discard"}),i=this._encoder.digest(s);return s.close(),i}_flush(){return this._encoder.flush()}},ut=class extends P{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="video")throw new TypeError("track must be a video MediaStreamTrack.");t={...t,latencyMode:"realtime"},super(t.codec),this._encoder=new ge(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:s=>{this._encoder.digest(s),s.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(s=>{s instanceof DOMException&&s.name==="AbortError"||console.error("Pipe error:",s)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},D=class extends ne{_connectedTrack=null;_codec;constructor(e){if(super(),!ie.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${ie.join(", ")}.`);this._codec=e}},mt=class extends D{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},li=r=>{if(!r||typeof r!="object")throw new TypeError("Codec config must be an object.");if(!ie.includes(r.codec))throw new TypeError(`Invalid audio codec '${r.codec}'. Must be one of: ${ie.join(", ")}.`);if(!Number.isInteger(r.bitrate)||r.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.")},ke=class{constructor(e,t){this.source=e;this.codecConfig=t;li(t)}encoder=null;muxer=null;lastNumberOfChannels=null;lastSampleRate=null;async digest(e){if(this.source._ensureValidDigest(),this.lastNumberOfChannels!==null&&this.lastSampleRate!==null){if(e.numberOfChannels!==this.lastNumberOfChannels||e.sampleRate!==this.lastSampleRate)throw new Error(`Audio parameters must remain constant. Expected ${this.lastNumberOfChannels} channels at ${this.lastSampleRate} Hz, got ${e.numberOfChannels} channels at ${e.sampleRate} Hz.`)}else this.lastNumberOfChannels=e.numberOfChannels,this.lastSampleRate=e.sampleRate;this.ensureEncoder(e),m(this.encoder),this.encoder.encode(e),this.encoder.encodeQueueSize>=4&&await new Promise(t=>this.encoder.addEventListener("dequeue",t,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new AudioEncoder({output:(t,s)=>void this.muxer.addEncodedAudioChunk(this.source._connectedTrack,t,s),error:t=>console.error("Audio encode error:",t)}),this.encoder.configure({codec:Xt(this.codecConfig.codec,e.numberOfChannels,e.sampleRate),numberOfChannels:e.numberOfChannels,sampleRate:e.sampleRate,bitrate:this.codecConfig.bitrate,...Zt(this.codecConfig.codec)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},dt=class extends D{_encoder;constructor(e){super(e.codec),this._encoder=new ke(this,e)}digest(e){if(!(e instanceof AudioData))throw new TypeError("audioData must be an AudioData.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},lt=class extends D{_encoder;_accumulatedFrameCount=0;constructor(e){super(e.codec),this._encoder=new ke(this,e)}digest(e){if(!(e instanceof AudioBuffer))throw new TypeError("audioBuffer must be an AudioBuffer.");let t=e.numberOfChannels,s=e.sampleRate,i=e.length,a=new Float32Array(t*i);for(let o=0;o<t;o++){let u=e.getChannelData(o);a.set(u,o*i)}let n=new AudioData({format:"f32-planar",sampleRate:s,numberOfFrames:i,numberOfChannels:t,timestamp:Math.round(1e6*this._accumulatedFrameCount/s),data:a}),c=this._encoder.digest(n);return n.close(),this._accumulatedFrameCount+=i,c}_flush(){return this._encoder.flush()}},ft=class extends D{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="audio")throw new TypeError("track must be an audio MediaStreamTrack.");super(t.codec),this._encoder=new ke(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:s=>{this._encoder.digest(s),s.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(s=>{s instanceof DOMException&&s.name==="AbortError"||console.error("Pipe error:",s)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},oe=class extends ne{_connectedTrack=null;_codec;constructor(e){if(super(),!Ve.includes(e))throw new TypeError(`Invalid subtitle codec '${e}'. Must be one of: ${Ve.join(", ")}.`);this._codec=e}},pt=class extends oe{_parser;constructor(e){super(e),this._parser=new ve({codec:e,output:(t,s)=>this._connectedTrack?.output._muxer.addSubtitleCue(this._connectedTrack,t,s),error:t=>console.error("Subtitle parse error:",t)})}digest(e){if(typeof e!="string")throw new TypeError("text must be a string.");return this._ensureValidDigest(),this._parser.parse(e),this._connectedTrack.output._muxer.mutex.currentPromise}};var ht=class{_muxer;_writer;_tracks=[];_started=!1;_finalizing=!1;_mutex=new U;constructor(e){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(!(e.format instanceof G))throw new TypeError("options.format must be an OutputFormat.");if(!(e.target instanceof X))throw new TypeError("options.target must be a Target.");if(e.target._output)throw new Error("Target is already used for another output.");e.target._output=this,this._writer=e.target._createWriter(),this._muxer=e.format._createMuxer(this)}addVideoTrack(e,t={}){if(!(e instanceof P))throw new TypeError("source must be a VideoSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");if(typeof t.rotation=="number"&&![0,90,180,270].includes(t.rotation))throw new TypeError(`Invalid video rotation: ${t.rotation}. Has to be 0, 90, 180 or 270.`);if(Array.isArray(t.rotation)&&(t.rotation.length!==9||t.rotation.some(s=>!Number.isFinite(s))))throw new TypeError(`Invalid video transformation matrix: ${t.rotation.join()}`);if(t.frameRate!==void 0&&(!Number.isInteger(t.frameRate)||t.frameRate<=0))throw new TypeError(`Invalid video frame rate: ${t.frameRate}. Must be a positive integer.`);this._addTrack("video",e,t)}addAudioTrack(e,t={}){if(!(e instanceof D))throw new TypeError("source must be an AudioSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("audio",e,t)}addSubtitleTrack(e,t={}){if(!(e instanceof oe))throw new TypeError("source must be a SubtitleSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("subtitle",e,t)}_addTrack(e,t,s){if(this._started)throw new Error("Cannot add track after output has started.");if(t._connectedTrack)throw new Error("Source is already used for a track.");let i={id:this._tracks.length+1,output:this,type:e,source:t,metadata:s};this._muxer.beforeTrackAdd(i),this._tracks.push(i),t._connectedTrack=i}async start(){if(this._started)throw new Error("Output already started.");this._started=!0,this._writer.start();let e=await this._mutex.acquire();await this._muxer.start();for(let t of this._tracks)t.source._start();e()}async finalize(){if(!this._started)throw new Error("Cannot finalize before starting.");if(this._finalizing)throw new Error("Cannot call finalize twice.");this._finalizing=!0;let e=await this._mutex.acquire(),t=this._tracks.map(s=>s.source._flush());await Promise.all(t),await this._muxer.finalize(),await this._writer.flush(),await this._writer.finalize(),e()}};var Te=class{_sizePromise=null;_getSize(){return this._sizePromise??=this._retrieveSize()}},bt=class extends Te{constructor(t){super();this.buffer=t}async _read(t,s){return new Uint8Array(this.buffer,t,s-t)}async _retrieveSize(){return this.buffer.byteLength}},gt=class extends Te{constructor(t){super();this.blob=t}async _read(t,s){let a=await this.blob.slice(t,s).arrayBuffer();return new Uint8Array(a)}async _retrieveSize(){return this.blob.size}};var ce=class{input;constructor(e){this.input=e}};var Be=class{_backing;constructor(e){this._backing=e}isVideoTrack(){return this instanceof xe}isAudioTrack(){return this instanceof Se}getDuration(){return this._backing.getDuration()}},xe=class extends Be{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getWidth(){return this._backing.getWidth()}getHeight(){return this._backing.getHeight()}getRotation(){return this._backing.getRotation()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}},Se=class extends Be{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getNumberOfChannels(){return this._backing.getNumberOfChannels()}getSampleRate(){return this._backing.getSampleRate()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}};var ue=class{constructor(e,t=1/0){this.source=e;this.maxStorableBytes=t}loadedSegments=[];loadingSegments=[];sourceSizePromise=null;nextAge=0;totalStoredBytes=0;async loadRange(e,t){t=Math.min(t,await this.source._getSize());let s=this.loadingSegments.find(o=>o.start<=e&&o.end>=t);if(s){await s.promise;return}if(this.loadedSegments.some(o=>o.start<=e&&o.end>=t))return;let a=this.source._read(e,t),n={start:e,end:t,promise:a};this.loadingSegments.push(n);let c=await a;Et(this.loadingSegments,n),this.insertIntoLoadedSegments(e,c)}insertIntoLoadedSegments(e,t){let s={start:e,end:e+t.byteLength,bytes:t,view:new DataView(t.buffer),age:this.nextAge++},i=I(this.loadedSegments,e,a=>a.start);(i===-1||this.loadedSegments[i].start<s.start)&&i++,this.loadedSegments.splice(i,0,s),this.totalStoredBytes+=t.byteLength;for(let a=i+1;a<this.loadedSegments.length;a++){let n=this.loadedSegments[a];if(n.start>=s.end)break;s.start<=n.start&&n.end<=s.end&&(this.loadedSegments.splice(a,1),a--)}for(;this.totalStoredBytes>this.maxStorableBytes&&this.loadedSegments.length>1;){let a=null,n=-1;for(let c=0;c<this.loadedSegments.length;c++){let o=this.loadedSegments[c];(!a||o.age<a.age)&&(a=o,n=c)}m(a),this.totalStoredBytes-=a.bytes.byteLength,this.loadedSegments.splice(n,1)}}getViewAndOffset(e,t){let s=I(this.loadedSegments,e,a=>a.start),i=null;if(s!==-1)for(let a=s;a<this.loadedSegments.length;a++){let n=this.loadedSegments[a];if(n.start>e)break;if(t<=n.end){i=n;break}}if(!i)throw new Error(`No segment loaded for range [${e}, ${t}).`);return i.age=this.nextAge++,{view:i.view,offset:i.bytes.byteOffset+e-i.start}}forgetRange(e,t){if(t<=e)return;let s=I(this.loadedSegments,e,a=>a.start);if(s===-1)return;let i=this.loadedSegments[s];i.start!==e||i.end!==t||(this.loadedSegments.splice(s,1),this.totalStoredBytes-=i.bytes.byteLength)}};var Y=class{constructor(e){this.reader=e}pos=0;readRange(e,t){let{view:s,offset:i}=this.reader.getViewAndOffset(e,t);return new Uint8Array(s.buffer,i,t-e)}readU8(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+1);return this.pos++,e.getUint8(t)}readU16(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+2);return this.pos+=2,e.getUint16(t,!1)}readU24(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+3);this.pos+=3;let s=e.getUint16(t,!1),i=e.getUint8(t+2);return s*256+i}readS32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getUint32(t,!1)}readI32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU64(){let e=this.readU32(),t=this.readU32();return e*4294967296+t}readF64(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+8);return this.pos+=8,e.getFloat64(t,!1)}readFixed_16_16(){return this.readS32()/65536}readFixed_2_30(){return this.readS32()/1073741824}readAscii(e){let{view:t,offset:s}=this.reader.getViewAndOffset(this.pos,this.pos+e);this.pos+=e;let i="";for(let a=0;a<e;a++)i+=String.fromCharCode(t.getUint8(s+a));return i}readIsomVariableInteger(){let e=0;for(let t=0;t<4;t++){e<<=7;let s=this.readU8();if(e|=s&127,!(s&128))break}return e}readBoxHeader(){let e=this.readU32(),t=this.readAscii(4),s=8;return e===1&&(e=this.readU64(),s=16),{name:t,totalSize:e,headerSize:s,contentSize:e-s}}};var fi=[B(0),B(90),B(180),B(270)],Ne=class extends ce{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new U;chunkReader;constructor(e){super(e),this.isobmffReader=new Y(e._mainReader),this.chunkReader=new Y(new ue(e._source,64*2**20))}async getDuration(){if(await this.readMetadata(),this.movieDurationInTimescale===-1)throw new Error("Could not read movie duration.");return this.movieDurationInTimescale/this.movieTimescale}async getTracks(){return await this.readMetadata(),this.tracks.map(e=>e.inputTrack)}async getMimeType(){await this.readMetadata();let e="video/mp4";if(this.tracks.length>0){let t=await Promise.all(this.tracks.map(i=>i.inputTrack.getCodecMimeType())),s=[...new Set(t)];e+=`; codecs="${s.join(", ")}"`}return e}readMetadata(){return this.metadataPromise??=(async()=>{let e=await this.isobmffReader.reader.source._getSize();for(;this.isobmffReader.pos<e;){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.pos,s=this.isobmffReader.readBoxHeader();if(s.name==="moov"){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+s.contentSize),this.readContiguousBoxes(s.contentSize);break}this.isobmffReader.pos=t+s.totalSize}if(this.isFragmented){await this.isobmffReader.reader.loadRange(e-4,e),this.isobmffReader.pos=e-4;let t=this.isobmffReader.readU32(),s=e-t;if(s>=0&&s<e){await this.isobmffReader.reader.loadRange(s,e),this.isobmffReader.pos=s;let i=this.isobmffReader.readBoxHeader();i.name==="mfra"&&this.readContiguousBoxes(i.contentSize)}}})()}getSampleTableForTrack(e){if(e.sampleTable)return e.sampleTable;let t={sampleTimingEntries:[],sampleCompositionTimeOffsets:[],sampleSizes:[],keySampleIndices:null,chunkOffsets:[],sampleToChunk:[],presentationTimestamps:[]};e.sampleTable=t,this.isobmffReader.pos=e.sampleTableOffset,this.currentTrack=e,this.traverseBox(),this.currentTrack=null;for(let s of t.sampleTimingEntries)for(let i=0;i<s.count;i++)t.presentationTimestamps.push({presentationTimestamp:s.startDecodeTimestamp+i*s.delta,sampleIndex:s.startIndex+i});for(let s of t.sampleCompositionTimeOffsets)for(let i=0;i<s.count;i++){let a=s.startIndex+i,n=t.presentationTimestamps[a];n&&(n.presentationTimestamp+=s.offset)}return t.presentationTimestamps.sort((s,i)=>s.presentationTimestamp-i.presentationTimestamp),e.sampleTable}async readFragment(){let e=this.isobmffReader.pos;await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.readBoxHeader();m(t.name==="moof"),await this.isobmffReader.reader.loadRange(e,e+t.totalSize),this.isobmffReader.pos=e,this.traverseBox();let s=z(this.fragments,e,a=>a.moofOffset);m(s!==-1);let i=this.fragments[s];m(i.moofOffset===e),this.isobmffReader.reader.forgetRange(e,e+t.totalSize);for(let[a,n]of i.trackData){if(n.startTimestampIsFinal)continue;let c=this.tracks.find(l=>l.id===a);this.isobmffReader.pos=0;let o=null,u=null,d=I(c.fragments,e-1,l=>l.moofOffset);for(d!==-1&&(o=c.fragments[d],u=o,this.isobmffReader.pos=o.moofOffset+o.moofSize);this.isobmffReader.pos<e;){if(o?.nextFragment)o=o.nextFragment,this.isobmffReader.pos=o.moofOffset+o.moofSize;else{await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let l=this.isobmffReader.pos,g=this.isobmffReader.readBoxHeader();if(g.name==="moof"){let h=z(this.fragments,l,b=>b.moofOffset);if(h===-1){this.isobmffReader.pos=l;let b=await this.readFragment();o&&(o.nextFragment=b),o=b}else{let b=this.fragments[h];o&&(o.nextFragment=b),o=b}}this.isobmffReader.pos=l+g.totalSize}o&&o.trackData.has(a)&&(u=o)}if(u){let l=u.trackData.get(a);m(l.startTimestampIsFinal),sr(n,l.endTimestamp)}n.startTimestampIsFinal=!0}return i}readContiguousBoxes(e){let t=this.isobmffReader.pos;for(;this.isobmffReader.pos-t<e;)this.traverseBox()}traverseBox(){let e=this.isobmffReader.pos,t=this.isobmffReader.readBoxHeader(),s=e+t.totalSize;switch(t.name){case"mdia":case"minf":case"dinf":case"mfra":this.readContiguousBoxes(t.contentSize);break;case"mvhd":{let i=this.isobmffReader.readU8();this.isobmffReader.pos+=3,i===1?(this.isobmffReader.pos+=16,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU64()):(this.isobmffReader.pos+=8,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU32())}break;case"trak":{let i={id:-1,demuxer:this,inputTrack:null,info:null,timescale:-1,durationInTimescale:-1,rotation:0,sampleTableOffset:-1,sampleTable:null,fragmentLookupTable:null,currentFragmentState:null,fragments:[]};if(this.currentTrack=i,this.readContiguousBoxes(t.contentSize),i.id!==-1&&i.timescale!==-1&&i.info!==null){if(i.info.type==="video"&&i.info.codec!==null){let a=i;i.inputTrack=new xe(new kt(a)),this.tracks.push(i)}else if(i.info.type==="audio"&&i.info.codec!==null){let a=i;i.inputTrack=new Se(new Tt(a)),this.tracks.push(i)}}this.currentTrack=null}break;case"tkhd":{let i=this.currentTrack;m(i);let a=this.isobmffReader.readU8();if(!((this.isobmffReader.readU24()&1)!==0))break;if(a===0)this.isobmffReader.pos+=8,i.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=8;else if(a===1)this.isobmffReader.pos+=16,i.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=12;else throw new Error(`Incorrect track header version ${a}.`);this.isobmffReader.pos+=2*4+2+2+2+2;let o=[];o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16()),this.isobmffReader.pos+=4,o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16());let u=fi.findIndex(d=>d.every((l,g)=>l===o[g]));u===-1?i.rotation=0:i.rotation=90*u}break;case"mdhd":{let i=this.currentTrack;m(i);let a=this.isobmffReader.readU8();this.isobmffReader.pos+=3,a===0?(this.isobmffReader.pos+=8,i.timescale=this.isobmffReader.readU32(),i.durationInTimescale=this.isobmffReader.readU32()):a===1&&(this.isobmffReader.pos+=16,i.timescale=this.isobmffReader.readU32(),i.durationInTimescale=this.isobmffReader.readU64())}break;case"hdlr":{let i=this.currentTrack;m(i),this.isobmffReader.pos+=8;let a=this.isobmffReader.readAscii(4);a==="vide"?i.info={type:"video",width:-1,height:-1,codec:null,codecDescription:null,colorSpace:null}:a==="soun"&&(i.info={type:"audio",numberOfChannels:-1,sampleRate:-1,codec:null,codecDescription:null})}break;case"stbl":{let i=this.currentTrack;m(i),i.sampleTableOffset=e,this.readContiguousBoxes(t.contentSize)}break;case"stsd":{let i=this.currentTrack;if(m(i),i.info===null||i.sampleTable)break;let a=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=this.isobmffReader.readU32();for(let c=0;c<n;c++){let o=this.isobmffReader.readBoxHeader();if(i.info.type==="video"){if(o.name==="avc1")i.info.codec="avc";else if(o.name==="hvc1"||o.name==="hev1")i.info.codec="hevc";else{console.warn(`Unsupported video sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2+2+2+3*4,i.info.width=this.isobmffReader.readU16(),i.info.height=this.isobmffReader.readU16(),this.isobmffReader.pos+=50,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}else{if(o.name==="mp4a")i.info.codec="aac";else if(o.name.toLowerCase()==="opus")i.info.codec="opus";else{console.warn(`Unsupported audio sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2;let u=this.isobmffReader.readU16();this.isobmffReader.pos+=3*2;let d=this.isobmffReader.readU16();this.isobmffReader.pos+=6;let l=this.isobmffReader.readU32()/65536;if(a===0&&u>0){if(u===1)this.isobmffReader.pos+=4*4;else if(u===2){this.isobmffReader.pos+=4,l=this.isobmffReader.readF64(),d=this.isobmffReader.readU32(),this.isobmffReader.pos+=4;let g=this.isobmffReader.readU32(),h=this.isobmffReader.readU32(),b=this.isobmffReader.readU32(),p=this.isobmffReader.readU32()}}i.info.numberOfChannels=d,i.info.sampleRate=l,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}}}break;case"avcC":{let i=this.currentTrack;m(i&&i.info),i.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"hvcC":{let i=this.currentTrack;m(i&&i.info),i.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"colr":{let i=this.currentTrack;if(m(i&&i.info?.type==="video"),this.isobmffReader.readAscii(4)!=="nclx")break;let n=this.isobmffReader.readU16(),c=this.isobmffReader.readU16(),o=this.isobmffReader.readU16(),u=!!(this.isobmffReader.readU8()&128);i.info.colorSpace={primaries:It[n],transfer:_t[c],matrix:Rt[o],fullRange:u}}break;case"wave":t.totalSize>8&&this.readContiguousBoxes(t.contentSize);break;case"esds":{let i=this.currentTrack;m(i&&i.info),this.isobmffReader.pos+=4;let a=this.isobmffReader.readU8();m(a===3),this.isobmffReader.readIsomVariableInteger(),this.isobmffReader.pos+=2;let n=this.isobmffReader.readU8(),c=(n&128)!==0,o=(n&64)!==0,u=(n&32)!==0;if(c&&(this.isobmffReader.pos+=2),o){let b=this.isobmffReader.readU8();this.isobmffReader.pos+=b}u&&(this.isobmffReader.pos+=2);let d=this.isobmffReader.readU8();m(d===4),this.isobmffReader.readIsomVariableInteger();let l=this.isobmffReader.readU8();m(l===64),this.isobmffReader.pos+=12;let g=this.isobmffReader.readU8();m(g===5);let h=this.isobmffReader.readIsomVariableInteger();i.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+h)}break;case"stts":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32(),n=0,c=0;for(let o=0;o<a;o++){let u=this.isobmffReader.readU32(),d=this.isobmffReader.readU32();i.sampleTable.sampleTimingEntries.push({startIndex:n,startDecodeTimestamp:c,count:u,delta:d}),n+=u,c+=u*d}}break;case"ctts":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32(),n=0;for(let c=0;c<a;c++){let o=this.isobmffReader.readU32(),u=this.isobmffReader.readI32();i.sampleTable.sampleCompositionTimeOffsets.push({startIndex:n,count:o,offset:u}),n+=o}}break;case"stsz":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32(),n=this.isobmffReader.readU32();if(a===0)for(let c=0;c<n;c++){let o=this.isobmffReader.readU32();i.sampleTable.sampleSizes.push(o)}else i.sampleTable.sampleSizes.push(a)}break;case"stz2":throw new Error("Unsupported.");case"stss":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4,i.sampleTable.keySampleIndices=[];let a=this.isobmffReader.readU32();for(let n=0;n<a;n++){let c=this.isobmffReader.readU32()-1;i.sampleTable.keySampleIndices.push(c)}}break;case"stsc":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32();for(let c=0;c<a;c++){let o=this.isobmffReader.readU32()-1,u=this.isobmffReader.readU32(),d=this.isobmffReader.readU32();i.sampleTable.sampleToChunk.push({startSampleIndex:-1,startChunkIndex:o,samplesPerChunk:u,sampleDescriptionIndex:d})}let n=0;for(let c=0;c<i.sampleTable.sampleToChunk.length;c++)if(i.sampleTable.sampleToChunk[c].startSampleIndex=n,c<i.sampleTable.sampleToChunk.length-1){let u=i.sampleTable.sampleToChunk[c+1].startChunkIndex-i.sampleTable.sampleToChunk[c].startChunkIndex;n+=u*i.sampleTable.sampleToChunk[c].samplesPerChunk}}break;case"stco":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32();for(let n=0;n<a;n++){let c=this.isobmffReader.readU32();i.sampleTable.chunkOffsets.push(c)}}break;case"co64":{let i=this.currentTrack;if(m(i),!i.sampleTable)break;this.isobmffReader.pos+=4;let a=this.isobmffReader.readU32();for(let n=0;n<a;n++){let c=this.isobmffReader.readU64();i.sampleTable.chunkOffsets.push(c)}}break;case"mvex":this.isFragmented=!0,this.readContiguousBoxes(t.contentSize);break;case"mehd":{let i=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=i===1?this.isobmffReader.readU64():this.isobmffReader.readU32();this.movieDurationInTimescale=a}break;case"trex":{this.isobmffReader.pos+=4;let i=this.isobmffReader.readU32(),a=this.isobmffReader.readU32(),n=this.isobmffReader.readU32(),c=this.isobmffReader.readU32(),o=this.isobmffReader.readU32();this.fragmentTrackDefaults.push({trackId:i,defaultSampleDescriptionIndex:a,defaultSampleDuration:n,defaultSampleSize:c,defaultSampleFlags:o})}break;case"tfra":{let i=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=this.isobmffReader.readU32(),n=this.tracks.find(w=>w.id===a);if(!n)break;n.fragmentLookupTable=[];let c=this.isobmffReader.readU32(),o=(c&48)>>4,u=(c&12)>>2,d=c&3,l=this.isobmffReader,g=[l.readU8.bind(l),l.readU16.bind(l),l.readU24.bind(l),l.readU32.bind(l)],h=g[o],b=g[u],p=g[d],x=this.isobmffReader.readU32();for(let w=0;w<x;w++){let y=i===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),N=i===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),Z=h(),V=b(),A=p();n.fragmentLookupTable.push({timestamp:y,moofOffset:N})}}break;case"moof":{this.currentFragment={moofOffset:e,moofSize:t.totalSize,implicitBaseDataOffset:e,trackData:new Map,dataStart:1/0,dataEnd:0,nextFragment:null},this.readContiguousBoxes(t.contentSize);let i=I(this.fragments,this.currentFragment.moofOffset,a=>a.moofOffset);this.fragments.splice(i+1,0,this.currentFragment);for(let[,a]of this.currentFragment.trackData){let n=a.samples[0],c=_(a.samples);this.currentFragment.dataStart=Math.min(this.currentFragment.dataStart,n.byteOffset),this.currentFragment.dataEnd=Math.max(this.currentFragment.dataEnd,c.byteOffset+c.byteSize)}this.currentFragment=null}break;case"traf":if(m(this.currentFragment),this.readContiguousBoxes(t.contentSize),this.currentTrack){let i=this.currentFragment.trackData.get(this.currentTrack.id);if(i){let a=I(this.currentTrack.fragments,this.currentFragment.moofOffset,c=>c.moofOffset);this.currentTrack.fragments.splice(a+1,0,this.currentFragment);let{currentFragmentState:n}=this.currentTrack;m(n),n.startTimestamp!==null&&(sr(i,n.startTimestamp),i.startTimestampIsFinal=!0)}this.currentTrack.currentFragmentState=null,this.currentTrack=null}break;case"tfhd":{m(this.currentFragment),this.isobmffReader.pos+=1;let i=this.isobmffReader.readU24(),a=!!(i&1),n=!!(i&2),c=!!(i&8),o=!!(i&16),u=!!(i&32),d=!!(i&65536),l=!!(i&131072),g=this.isobmffReader.readU32(),h=this.tracks.find(p=>p.id===g);if(!h)break;let b=this.fragmentTrackDefaults.find(p=>p.trackId===g);this.currentTrack=h,h.currentFragmentState={baseDataOffset:this.currentFragment.implicitBaseDataOffset,sampleDescriptionIndex:b?.defaultSampleDescriptionIndex??null,defaultSampleDuration:b?.defaultSampleDuration??null,defaultSampleSize:b?.defaultSampleSize??null,defaultSampleFlags:b?.defaultSampleFlags??null,startTimestamp:null},a?h.currentFragmentState.baseDataOffset=this.isobmffReader.readU64():l&&(h.currentFragmentState.baseDataOffset=this.currentFragment.moofOffset),n&&(h.currentFragmentState.sampleDescriptionIndex=this.isobmffReader.readU32()),c&&(h.currentFragmentState.defaultSampleDuration=this.isobmffReader.readU32()),o&&(h.currentFragmentState.defaultSampleSize=this.isobmffReader.readU32()),u&&(h.currentFragmentState.defaultSampleFlags=this.isobmffReader.readU32()),d&&(h.currentFragmentState.defaultSampleDuration=0)}break;case"tfdt":{let i=this.currentTrack;if(!i)break;m(i.currentFragmentState);let a=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=a===0?this.isobmffReader.readU32():this.isobmffReader.readU64();i.currentFragmentState.startTimestamp=n}break;case"trun":{let i=this.currentTrack;if(!i)break;if(m(this.currentFragment),m(i.currentFragmentState),this.currentFragment.trackData.has(i.id))throw new Error("Can't have two trun boxes for the same track in one fragment.");let a=this.isobmffReader.readU8(),n=this.isobmffReader.readU24(),c=!!(n&1),o=!!(n&4),u=!!(n&256),d=!!(n&512),l=!!(n&1024),g=!!(n&2048),h=this.isobmffReader.readU32(),b=i.currentFragmentState.baseDataOffset;c&&(b+=this.isobmffReader.readI32());let p=null;o&&(p=this.isobmffReader.readU32());let x=b;if(h===0){this.currentFragment.implicitBaseDataOffset=x;break}let w=0,y={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(i.id,y);for(let V=0;V<h;V++){let A;u?A=this.isobmffReader.readU32():(m(i.currentFragmentState.defaultSampleDuration!==null),A=i.currentFragmentState.defaultSampleDuration);let Ce;d?Ce=this.isobmffReader.readU32():(m(i.currentFragmentState.defaultSampleSize!==null),Ce=i.currentFragmentState.defaultSampleSize);let we;l?we=this.isobmffReader.readU32():(m(i.currentFragmentState.defaultSampleFlags!==null),we=i.currentFragmentState.defaultSampleFlags),V===0&&p!==null&&(we=p);let Ke=0;g&&(a===0?Ke=this.isobmffReader.readU32():Ke=this.isobmffReader.readI32());let nr=!(we&65536);y.samples.push({presentationTimestamp:w+Ke,duration:A,byteOffset:x,byteSize:Ce,isKeyFrame:nr}),x+=Ce,w+=A}y.presentationTimestamps=y.samples.map((V,A)=>({presentationTimestamp:V.presentationTimestamp,sampleIndex:A})).sort((V,A)=>V.presentationTimestamp-A.presentationTimestamp);let N=y.samples[y.presentationTimestamps[0].sampleIndex],Z=y.samples[_(y.presentationTimestamps).sampleIndex];y.startTimestamp=N.presentationTimestamp,y.endTimestamp=Z.presentationTimestamp+Z.duration,this.currentFragment.implicitBaseDataOffset=x}break}this.isobmffReader.pos=s}},We=class{constructor(e){this.internalTrack=e}chunkToSampleIndex=new WeakMap;sampleIndexToChunk=new Map;chunkToFragmentLocation=new WeakMap;fragmentLocationToChunk=new Map;getCodec(){throw new Error("Not implemented on base class.")}async getDuration(){return this.internalTrack.durationInTimescale/this.internalTrack.timescale}},kt=class extends We{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getWidth(){return this.internalTrack.info.width}async getHeight(){return this.internalTrack.info.height}async getRotation(){return this.internalTrack.rotation}async getDecoderConfig(){return{codec:qt(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),codedWidth:this.internalTrack.info.width,codedHeight:this.internalTrack.info.height,description:this.internalTrack.info.codecDescription??void 0,colorSpace:this.internalTrack.info.colorSpace??void 0}}async getFirstChunk(){return this.internalTrack.demuxer.isFragmented?this.performFragmentedLookup(()=>{let e=this.internalTrack.fragments[0];return{fragmentIndex:e?0:-1,sampleIndex:e?0:-1,correctSampleFound:!!e}},0,1/0):this.fetchChunkForSampleIndex(0)}async getChunk(e){let t=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findSampleInFragmentsForTimestamp(t),t,t);{let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=ir(s,t);return this.fetchChunkForSampleIndex(i)}}async getNextChunk(e){if(this.internalTrack.demuxer.isFragmented){let s=this.chunkToFragmentLocation.get(e);if(s===void 0)throw new Error("Chunk was not created from this track.");let i=s.fragment.trackData.get(this.internalTrack.id),a=i.samples[s.sampleIndex],n=z(this.internalTrack.fragments,s.fragment.moofOffset,c=>c.moofOffset);return m(n!==-1),this.performFragmentedLookup(()=>{if(s.sampleIndex+1<i.samples.length)return{fragmentIndex:n,sampleIndex:s.sampleIndex+1,correctSampleFound:!0};{let c=s.fragment;for(;c.nextFragment;)if(c=c.nextFragment,c.trackData.get(this.internalTrack.id)){let u=z(this.internalTrack.fragments,c.moofOffset,d=>d.moofOffset);return m(u!==-1),{fragmentIndex:u,sampleIndex:0,correctSampleFound:!0}}return{fragmentIndex:n,sampleIndex:-1,correctSampleFound:!1}}},a.presentationTimestamp,1/0)}let t=this.chunkToSampleIndex.get(e);if(t===void 0)throw new Error("Chunk was not created from this track.");return this.fetchChunkForSampleIndex(t+1)}async getKeyChunk(e){let t=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findKeySampleInFragmentsForTimestamp(t),t,t);let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=ir(s,t),a=i===-1?-1:hi(s,i);return this.fetchChunkForSampleIndex(a)}async getNextKeyChunk(e){if(this.internalTrack.demuxer.isFragmented){let a=this.chunkToFragmentLocation.get(e);if(a===void 0)throw new Error("Chunk was not created from this track.");let n=a.fragment.trackData.get(this.internalTrack.id),c=n.samples[a.sampleIndex],o=z(this.internalTrack.fragments,a.fragment.moofOffset,u=>u.moofOffset);return m(o!==-1),this.performFragmentedLookup(()=>{let u=n.samples.findIndex((d,l)=>d.isKeyFrame&&l>a.sampleIndex);if(u!==-1)return{fragmentIndex:o,sampleIndex:u,correctSampleFound:!0};{let d=a.fragment;for(;d.nextFragment;){d=d.nextFragment;let l=d.trackData.get(this.internalTrack.id);if(l){let g=z(this.internalTrack.fragments,d.moofOffset,b=>b.moofOffset);m(g!==-1);let h=l.samples.findIndex(b=>b.isKeyFrame);if(h===-1)throw new Error("Not supported: Fragment does not contain key sample.");return{fragmentIndex:g,sampleIndex:h,correctSampleFound:!0}}}return{fragmentIndex:o,sampleIndex:-1,correctSampleFound:!1}}},c.presentationTimestamp,1/0)}let t=this.chunkToSampleIndex.get(e);if(t===void 0)throw new Error("Chunk was not created from this track.");let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=bi(s,t);return this.fetchChunkForSampleIndex(i)}async fetchChunkForSampleIndex(e){if(e===-1)return null;let t=this.sampleIndexToChunk.get(e)?.deref();if(t)return t;let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),i=pi(s,e);if(!i)return null;await this.internalTrack.demuxer.chunkReader.reader.loadRange(i.chunkOffset,i.chunkOffset+i.chunkSize);let a=this.internalTrack.demuxer.chunkReader.readRange(i.sampleOffset,i.sampleOffset+i.sampleSize),n=new EncodedVideoChunk({data:a,timestamp:1e6*i.presentationTimestamp/this.internalTrack.timescale,duration:1e6*i.duration/this.internalTrack.timescale,type:i.isKeyFrame?"key":"delta"});return this.chunkToSampleIndex.set(n,e),this.sampleIndexToChunk.set(e,new WeakRef(n)),n}async fetchChunkInFragment(e,t){if(t===-1)return null;let s=`${e.moofOffset}:${t}`,i=this.fragmentLocationToChunk.get(s)?.deref();if(i)return i;let n=e.trackData.get(this.internalTrack.id).samples[t];m(n),await this.internalTrack.demuxer.chunkReader.reader.loadRange(e.dataStart,e.dataEnd);let c=this.internalTrack.demuxer.chunkReader.readRange(n.byteOffset,n.byteOffset+n.byteSize),o=new EncodedVideoChunk({data:c,timestamp:1e6*n.presentationTimestamp/this.internalTrack.timescale,duration:1e6*n.duration/this.internalTrack.timescale,type:n.isKeyFrame?"key":"delta"});return this.chunkToFragmentLocation.set(o,{fragment:e,sampleIndex:t}),this.fragmentLocationToChunk.set(s,new WeakRef(o)),o}findSampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,a=>a.trackData.get(this.internalTrack.id).startTimestamp),s=-1,i=!1;if(t!==-1){let n=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=I(n.presentationTimestamps,e,o=>o.presentationTimestamp);m(c!==-1),s=n.presentationTimestamps[c].sampleIndex,i=e<n.endTimestamp}return{fragmentIndex:t,sampleIndex:s,correctSampleFound:i}}findKeySampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,a=>a.trackData.get(this.internalTrack.id).startTimestamp),s=-1,i=!1;if(t!==-1){let n=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=n.presentationTimestamps.findLastIndex(u=>n.samples[u.sampleIndex].isKeyFrame);if(c===-1)throw new Error("Not supported: Fragment does not contain key sample.");s=n.presentationTimestamps[c].sampleIndex,i=e<n.endTimestamp}return{fragmentIndex:t,sampleIndex:s,correctSampleFound:i}}async performFragmentedLookup(e,t,s){let{fragmentIndex:i,sampleIndex:a,correctSampleFound:n}=e();if(n){let u=this.internalTrack.fragments[i];return this.fetchChunkInFragment(u,a)}let c=this.internalTrack.demuxer,o=await c.fragmentLookupMutex.acquire();try{let u=c.isobmffReader,d=await u.reader.source._getSize(),l=null,g=i,h=a,b=null;if(this.internalTrack.fragmentLookupTable){let p=I(this.internalTrack.fragmentLookupTable,t,x=>x.timestamp);p!==-1&&(b=this.internalTrack.fragmentLookupTable[p])}if(i===-1)u.pos=b?.moofOffset??0;else{let p=this.internalTrack.fragments[i];!b||p.moofOffset>=p.moofOffset?(u.pos=p.moofOffset+p.moofSize,l=p):u.pos=b.moofOffset}for(;u.pos<d;){if(l){let w=l.trackData.get(this.internalTrack.id);if(w&&w.startTimestamp>s)break;if(l.nextFragment){u.pos=l.nextFragment.moofOffset+l.nextFragment.moofSize,l=l.nextFragment;continue}}await u.reader.loadRange(u.pos,u.pos+16);let p=u.pos,x=u.readBoxHeader();if(x.name==="moof"){let w=z(c.fragments,p,y=>y.moofOffset);if(w===-1){u.pos=p;let y=await c.readFragment();l&&(l.nextFragment=y),l=y;let{fragmentIndex:N,sampleIndex:Z,correctSampleFound:V}=e();if(V){let A=this.internalTrack.fragments[N];return this.fetchChunkInFragment(A,Z)}N!==-1&&(g=N,h=Z)}else{let y=c.fragments[w];l&&(l.nextFragment=y),l=y}}u.pos=p+x.totalSize}if(g!==-1){let p=this.internalTrack.fragments[g];return this.fetchChunkInFragment(p,h)}return null}finally{o()}}},Tt=class extends We{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getNumberOfChannels(){return this.internalTrack.info.numberOfChannels}async getSampleRate(){return this.internalTrack.info.sampleRate}async getDecoderConfig(){return{codec:Gt(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),numberOfChannels:this.internalTrack.info.numberOfChannels,sampleRate:this.internalTrack.info.sampleRate,description:this.internalTrack.info.codecDescription??void 0}}},ir=(r,e)=>{let t=I(r.presentationTimestamps,e,s=>s.presentationTimestamp);return t===-1?-1:r.presentationTimestamps[t].sampleIndex},pi=(r,e)=>{let t=I(r.sampleTimingEntries,e,p=>p.startIndex),s=r.sampleTimingEntries[t];if(!s||s.startIndex+s.count<=e)return null;let a=s.startDecodeTimestamp+(e-s.startIndex)*s.delta,n=I(r.sampleCompositionTimeOffsets,e,p=>p.startIndex),c=r.sampleCompositionTimeOffsets[n];c&&(a+=c.offset);let o=r.sampleSizes[Math.min(e,r.sampleSizes.length-1)],u=I(r.sampleToChunk,e,p=>p.startSampleIndex),d=r.sampleToChunk[u];m(d);let l=d.startChunkIndex+Math.floor((e-d.startSampleIndex)/d.samplesPerChunk),g=r.chunkOffsets[l],h=0,b=g;if(r.sampleSizes.length===1)b+=o*(e-d.startSampleIndex),h+=o*d.samplesPerChunk;else{let p=d.startSampleIndex+(l-d.startChunkIndex)*d.samplesPerChunk;for(let x=p;x<p+d.samplesPerChunk;x++){let w=r.sampleSizes[x];x<e&&(b+=w),h+=w}}return{presentationTimestamp:a,duration:s.delta,sampleOffset:b,sampleSize:o,chunkOffset:g,chunkSize:h,isKeyFrame:r.keySampleIndices?z(r.keySampleIndices,e,p=>p)!==-1:!0}},hi=(r,e)=>{if(!r.keySampleIndices)return e;let t=I(r.keySampleIndices,e,s=>s);return r.keySampleIndices[t]??-1},bi=(r,e)=>{if(!r.keySampleIndices)return e+1;let t=I(r.keySampleIndices,e,s=>s);return r.keySampleIndices[t+1]??-1},sr=(r,e)=>{r.startTimestamp+=e,r.endTimestamp+=e;for(let t of r.samples)t.presentationTimestamp+=e;for(let t of r.presentationTimestamps)t.presentationTimestamp+=e};var He=class extends ce{};var Le=class{},xt=class extends Le{async _canReadInput(e){if(await e._mainReader.source._getSize()<8)return!1;let s=new Y(e._mainReader);return s.pos=4,s.readAscii(4)==="ftyp"}_createDemuxer(e){return new Ne(e)}},St=class extends Le{async _canReadInput(){return!1}_createDemuxer(e){return new He(e)}},$e=new xt,gi=$e,ki=$e,Ct=new St,ar=Ct,Ti=Ct,xi=[$e,ar];var wt=class{_source;_formats;_mainReader;_demuxerPromise=null;_format=null;constructor(e){this._formats=e.formats,this._source=e.source,this._mainReader=new ue(e.source)}_getDemuxer(){return this._demuxerPromise??=(async()=>{await this._mainReader.loadRange(0,4096);for(let e of this._formats)if(await e._canReadInput(this))return this._format=e,e._createDemuxer(this);throw new Error("Input has an unrecognizable format.")})()}async getFormat(){return await this._getDemuxer(),m(this._format),this._format}async getDuration(){return(await this._getDemuxer()).getDuration()}async getTracks(){return(await this._getDemuxer()).getTracks()}async getVideoTracks(){return(await this.getTracks()).filter(t=>t.isVideoTrack())}async getPrimaryVideoTrack(){return(await this.getTracks()).find(t=>t.isVideoTrack())??null}async getAudioTracks(){return(await this.getTracks()).filter(t=>t.isAudioTrack())}async getPrimaryAudioTrack(){return(await this.getTracks()).find(t=>t.isAudioTrack())??null}async getMimeType(){return(await this._getDemuxer()).getMimeType()}};var Qe=class{constructor(e){this.videoTrack=e}getFirstChunk(){return this.videoTrack._backing.getFirstChunk()}getChunk(e){return this.videoTrack._backing.getChunk(e)}getNextChunk(e){return this.videoTrack._backing.getNextChunk(e)}getKeyChunk(e){return this.videoTrack._backing.getKeyChunk(e)}getNextKeyChunk(e){return this.videoTrack._backing.getNextKeyChunk(e)}async*chunks(e,t=1/0){let s=[],{promise:i,resolve:a}=j(),{promise:n,resolve:c}=j(),o=!1,u=[],d=()=>Math.max(2,u.length);(async()=>{let l=e??await this.getFirstChunk();for(;l&&!o&&!(l.timestamp/1e6>=t);){if(s.length>d()){({promise:n,resolve:c}=j()),await n;continue}s.push(l),a(),{promise:i,resolve:a}=j(),l=await this.getNextChunk(l)}o=!0,a()})();try{for(;;)if(s.length>0){yield s.shift();let l=performance.now();for(u.push(l);u.length>0&&l-u[0]>=1e3;)u.shift();c()}else if(!o)await i;else break}finally{o=!0,c()}}},yt=class{constructor(e){this.videoTrack=e}decoderConfig=null;async createDecoder(e){this.decoderConfig||(this.decoderConfig=await this.videoTrack.getDecoderConfig());let t=new VideoDecoder({output:e,error:s=>console.error(s)});return t.configure(this.decoderConfig),t}async getKeyFrame(e){let t=null,s=await this.createDecoder(a=>t=a),i=await this.videoTrack._backing.getKeyChunk(e);return i?(s.decode(i),await s.flush(),s.close(),t):null}async getFrame(e){let t=null,s=await this.createDecoder(c=>{c.timestamp/1e6<=e?(t?.close(),t=c):c.close()}),i=await this.videoTrack._backing.getKeyChunk(e);if(!i)return null;let a=await this.videoTrack._backing.getChunk(e);m(a),s.decode(i);let n=i;for(;n!==a;){let c=await this.videoTrack._backing.getNextChunk(n);m(c),n=c,s.decode(c),s.decodeQueueSize>=10&&await new Promise(o=>s.addEventListener("dequeue",o,{once:!0}))}return await s.flush(),s.close(),t}async*frames(e=0,t=1/0){let s=[],i=!1,a=null,{promise:n,resolve:c}=j(),o=!1,u=await this.createDecoder(g=>{let h=g.timestamp/1e6;if(h>=t&&(o=!0),o){g.close();return}a&&(h>e?(s.push(a),i=!0):a.close()),h>=e&&(s.push(g),i=!0),a=i?null:g,s.length>0&&(c(),{promise:n,resolve:c}=j())}),d=await this.videoTrack._backing.getKeyChunk(e)??await this.videoTrack._backing.getFirstChunk();if(!d)return;let l=!1;(async()=>{let g=d,h=1/0;if(t<1/0){let x=await this.videoTrack._backing.getChunk(t),w=x?x.type==="key"&&x.timestamp/1e6===t?x:await this.videoTrack._backing.getNextKeyChunk(x):null;w&&(h=w.timestamp/1e6)}let p=new Qe(this.videoTrack).chunks(d,h);for(await p.next();g&&!o;){u.decode(g),u.decodeQueueSize>=10&&await new Promise(w=>u.addEventListener("dequeue",w,{once:!0}));let x=await p.next();if(x.done)break;g=x.value}await p.return(),await u.flush(),u.close(),!i&&a&&s.push(a),l=!0,c()})();try{for(;;)if(s.length>0)yield s.shift();else if(!l)await n;else break}finally{o=!0}}};export{xi as ALL_FORMATS,ie as AUDIO_CODECS,bt as ArrayBufferSource,pe as ArrayBufferTarget,lt as AudioBufferSource,dt as AudioDataSource,D as AudioSource,gt as BlobSource,ct as CanvasSource,mt as EncodedAudioChunkSource,Qe as EncodedVideoChunkDrain,nt as EncodedVideoChunkSource,$e as ISOBMFF,wt as Input,Ct as MATROSKA,ar as MKV,ki as MOV,gi as MP4,ne as MediaSource,ft as MediaStreamAudioTrackSource,ut as MediaStreamVideoTrackSource,Ue as MkvOutputFormat,at as Mp4OutputFormat,ht as Output,G as OutputFormat,Ve as SUBTITLE_CODECS,Te as Source,tt as StreamTarget,oe as SubtitleSource,X as Target,pt as TextSubtitleSource,re as VIDEO_CODECS,yt as VideoFrameDrain,ot as VideoFrameSource,P as VideoSource,Ti as WEBM,ae as WebMOutputFormat};
+${t.notes??""}`,l=this.createInternalChunk(u,a,t.duration,"key",m.trim()?M.encode(m):null);n.chunkQueue.push(l),await this.interleaveChunks()}finally{s()}}async interleaveChunks(){for(let e of this.output._tracks)if(!e.source._closed&&!this.trackDatas.some(t=>t.track===e))return;e:for(;;){let e=null,t=1/0;for(let s of this.trackDatas){if(s.chunkQueue.length===0&&!s.track.source._closed)break e;s.chunkQueue.length>0&&s.chunkQueue[0].timestamp<t&&(e=s,t=s.chunkQueue[0].timestamp)}if(!e)break;let r=e.chunkQueue.shift();this.writeBlock(e,r)}await this.writer.flush()}fixVP9ColorSpace(e,t){if(t.type!=="key"||!e.info.decoderConfig.colorSpace||!e.info.decoderConfig.colorSpace.matrix)return;let r=0;if(R(t.data,0,2)!==2)return;r+=2;let s=(R(t.data,r+1,r+2)<<1)+R(t.data,r+0,r+1);r+=2,s===3&&r++;let n=R(t.data,r+0,r+1);if(r++,n)return;let a=R(t.data,r+0,r+1);if(r++,a!==0)return;r+=2;let c=R(t.data,r+0,r+24);if(r+=24,c!==4817730)return;s>=2&&r++;let o={rgb:7,bt709:2,bt470bg:1,smpte170m:3}[e.info.decoderConfig.colorSpace.matrix];Et(t.data,r+0,r+3,o)}createInternalChunk(e,t,r,s,n=null){return{data:e,type:s,timestamp:t,duration:r,additions:n}}writeBlock(e,t){this.segment||(this.createTracks(),this.createSegment());let r=Math.floor(1e3*t.timestamp),s=this.trackDatas.every(m=>{if(m.track.source._closed)return!0;if(e===m)return t.type==="key";let l=m.chunkQueue[0];return l&&l.type==="key"});(!this.currentCluster||s&&r-this.currentClusterMsTimestamp>=1e3)&&this.createNewCluster(r);let n=r-this.currentClusterMsTimestamp;if(n<0)return;if(n>=ut)throw new Error(`Current Matroska cluster exceeded its maximum allowed length of ${ut} milliseconds. In order to produce a correct WebM file, you must pass in a key frame at least every ${ut} milliseconds.`);let c=new Uint8Array(4),o=new DataView(c.buffer);o.setUint8(0,128|e.track.id),o.setInt16(1,n,!1);let u=Math.floor(1e3*t.duration);if(u===0&&!t.additions){o.setUint8(3,+(t.type==="key")<<7);let m={id:163,data:[c,t.data]};this.writeEBML(m)}else{let m={id:160,data:[{id:161,data:[c,t.data]},t.type==="delta"?{id:251,data:new ke(e.lastWrittenMsTimestamp-r)}:null,t.additions?{id:30113,data:[{id:166,data:[{id:165,data:t.additions},{id:238,data:1}]}]}:null,u>0?{id:155,data:u}:null]};this.writeEBML(m)}this.duration=Math.max(this.duration,r+u),e.lastWrittenMsTimestamp=r,this.trackDatasInCurrentCluster.add(e)}createNewCluster(e){this.currentCluster&&!this.format._options.streamable&&this.finalizeCurrentCluster(),this.currentCluster={id:524531317,size:this.format._options.streamable?-1:cr,data:[{id:231,data:e}]},this.writeEBML(this.currentCluster),this.currentClusterMsTimestamp=e,this.trackDatasInCurrentCluster.clear()}finalizeCurrentCluster(){d(this.currentCluster);let e=this.writer.getPos()-this.dataOffsets.get(this.currentCluster),t=this.writer.getPos();this.writer.seek(this.offsets.get(this.currentCluster)+4),this.writeEBMLVarInt(e,cr),this.writer.seek(t);let r=this.offsets.get(this.currentCluster)-this.segmentDataOffset;d(this.cues),this.cues.data.push({id:187,data:[{id:179,data:this.currentClusterMsTimestamp},...[...this.trackDatasInCurrentCluster].map(s=>({id:183,data:[{id:247,data:s.track.id},{id:241,data:r}]}))]})}async onTrackClose(){let e=await this.mutex.acquire();await this.interleaveChunks(),e()}async finalize(){let e=await this.mutex.acquire();this.segment||(this.createTracks(),this.createSegment());for(let t of this.trackDatas)for(;t.chunkQueue.length>0;)this.writeBlock(t,t.chunkQueue.shift());if(!this.format._options.streamable&&this.currentCluster&&this.finalizeCurrentCluster(),d(this.cues),this.writeEBML(this.cues),!this.format._options.streamable){let t=this.writer.getPos(),r=this.writer.getPos()-this.segmentDataOffset;this.writer.seek(this.offsets.get(this.segment)+4),this.writeEBMLVarInt(r,or),this.segmentDuration.data=new ne(this.duration),this.writer.seek(this.offsets.get(this.segmentDuration)),this.writeEBML(this.segmentDuration),this.seekHead.data[0].data[1].data=this.offsets.get(this.cues)-this.segmentDataOffset,this.seekHead.data[1].data[1].data=this.offsets.get(this.segmentInfo)-this.segmentDataOffset,this.seekHead.data[2].data[1].data=this.offsets.get(this.tracksElement)-this.segmentDataOffset,this.writer.seek(this.offsets.get(this.seekHead)),this.writeEBML(this.seekHead),this.writer.seek(t)}e()}};var Y=class{},mt=class extends Y{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.fastStart!==void 0&&![!1,"in-memory","fragmented"].includes(e.fastStart))throw new TypeError('options.fastStart, when provided, must be false, "in-memory", or "fragmented".');super(),this._options=e}_createMuxer(e){return new De(e,this)}},Ue=class extends Y{_options;constructor(e={}){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(e.streamable!==void 0&&typeof e.streamable!="boolean")throw new TypeError("options.streamable, when provided, must be a boolean.");super(),this._options=e}_createMuxer(e){return new ze(e,this)}},ae=class extends Ue{};var oe=class{_connectedTrack=null;_closed=!1;_offsetTimestamps=!1;_ensureValidDigest(){if(!this._connectedTrack)throw new Error("Cannot call digest without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call digest before output has been started.");if(this._connectedTrack.output._finalizing)throw new Error("Cannot call digest after output has started finalizing.");if(this._closed)throw new Error("Cannot call digest after source has been closed.")}_start(){}async _flush(){}close(){if(this._closed)throw new Error("Source already closed.");if(!this._connectedTrack)throw new Error("Cannot call close without connecting the source to an output track.");if(!this._connectedTrack.output._started)throw new Error("Cannot call close before output has been started.");this._closed=!0,!this._connectedTrack.output._finalizing&&this._connectedTrack.output._muxer.onTrackClose(this._connectedTrack)}},U=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!ie.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${ie.join(", ")}.`);this._codec=e}},dt=class extends U{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},bi=5,ki=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!ie.includes(i.codec))throw new TypeError(`Invalid video codec '${i.codec}'. Must be one of: ${ie.join(", ")}.`);if(!Number.isInteger(i.bitrate)||i.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.");if(i.latencyMode!==void 0&&!["quality","realtime"].includes(i.latencyMode))throw new TypeError("config.latencyMode, when provided, must be 'quality' or 'realtime'.")},ge=class{constructor(e,t){this.source=e;this.codecConfig=t;ki(t)}encoder=null;muxer=null;lastMultipleOfKeyFrameInterval=-1;lastWidth=null;lastHeight=null;async digest(e){if(this.source._ensureValidDigest(),this.lastWidth!==null&&this.lastHeight!==null){if(e.codedWidth!==this.lastWidth||e.codedHeight!==this.lastHeight)throw new Error(`Video frame size must remain constant. Expected ${this.lastWidth}x${this.lastHeight}, got ${e.codedWidth}x${e.codedHeight}.`)}else this.lastWidth=e.codedWidth,this.lastHeight=e.codedHeight;this.ensureEncoder(e),d(this.encoder);let t=Math.floor(e.timestamp/1e6/bi);this.encoder.encode(e,{keyFrame:t!==this.lastMultipleOfKeyFrameInterval}),this.lastMultipleOfKeyFrameInterval=t,this.encoder.encodeQueueSize>=4&&await new Promise(r=>this.encoder.addEventListener("dequeue",r,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new VideoEncoder({output:(t,r)=>void this.muxer.addEncodedVideoChunk(this.source._connectedTrack,t,r),error:t=>console.error("Video encode error:",t)}),this.encoder.configure({codec:Jt(this.codecConfig.codec,e.codedWidth,e.codedHeight,this.codecConfig.bitrate),width:e.codedWidth,height:e.codedHeight,bitrate:this.codecConfig.bitrate,framerate:this.source._connectedTrack?.metadata.frameRate,latencyMode:this.codecConfig.latencyMode,...ir(this.codecConfig.codec)}),d(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},lt=class extends U{_encoder;constructor(e){super(e.codec),this._encoder=new ge(this,e)}digest(e){if(!(e instanceof VideoFrame))throw new TypeError("videoFrame must be a VideoFrame.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},ft=class extends U{_encoder;_canvas;constructor(e,t){if(!(e instanceof HTMLCanvasElement))throw new TypeError("canvas must be an HTMLCanvasElement.");super(t.codec),this._encoder=new ge(this,t),this._canvas=e}digest(e,t=0){if(!Number.isFinite(e)||e<0)throw new TypeError("timestamp must be a non-negative number.");if(!Number.isFinite(t)||t<0)throw new TypeError("duration must be a non-negative number.");let r=new VideoFrame(this._canvas,{timestamp:Math.round(1e6*e),duration:Math.round(1e6*t),alpha:"discard"}),s=this._encoder.digest(r);return r.close(),s}_flush(){return this._encoder.flush()}},pt=class extends U{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="video")throw new TypeError("track must be a video MediaStreamTrack.");t={...t,latencyMode:"realtime"},super(t.codec),this._encoder=new ge(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:r=>{this._encoder.digest(r),r.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(r=>{r instanceof DOMException&&r.name==="AbortError"||console.error("Pipe error:",r)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},B=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!se.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${se.join(", ")}.`);this._codec=e}},ht=class extends B{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},gi=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!se.includes(i.codec))throw new TypeError(`Invalid audio codec '${i.codec}'. Must be one of: ${se.join(", ")}.`);if(!Number.isInteger(i.bitrate)||i.bitrate<=0)throw new TypeError("config.bitrate must be a positive integer.")},Te=class{constructor(e,t){this.source=e;this.codecConfig=t;gi(t)}encoder=null;muxer=null;lastNumberOfChannels=null;lastSampleRate=null;async digest(e){if(this.source._ensureValidDigest(),this.lastNumberOfChannels!==null&&this.lastSampleRate!==null){if(e.numberOfChannels!==this.lastNumberOfChannels||e.sampleRate!==this.lastSampleRate)throw new Error(`Audio parameters must remain constant. Expected ${this.lastNumberOfChannels} channels at ${this.lastSampleRate} Hz, got ${e.numberOfChannels} channels at ${e.sampleRate} Hz.`)}else this.lastNumberOfChannels=e.numberOfChannels,this.lastSampleRate=e.sampleRate;this.ensureEncoder(e),d(this.encoder),this.encoder.encode(e),this.encoder.encodeQueueSize>=4&&await new Promise(t=>this.encoder.addEventListener("dequeue",t,{once:!0})),await this.muxer.mutex.currentPromise}ensureEncoder(e){this.encoder||(this.encoder=new AudioEncoder({output:(t,r)=>void this.muxer.addEncodedAudioChunk(this.source._connectedTrack,t,r),error:t=>console.error("Audio encode error:",t)}),this.encoder.configure({codec:tr(this.codecConfig.codec,e.numberOfChannels,e.sampleRate),numberOfChannels:e.numberOfChannels,sampleRate:e.sampleRate,bitrate:this.codecConfig.bitrate,...sr(this.codecConfig.codec)}),d(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},bt=class extends B{_encoder;constructor(e){super(e.codec),this._encoder=new Te(this,e)}digest(e){if(!(e instanceof AudioData))throw new TypeError("audioData must be an AudioData.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},kt=class extends B{_encoder;_accumulatedFrameCount=0;constructor(e){super(e.codec),this._encoder=new Te(this,e)}digest(e){if(!(e instanceof AudioBuffer))throw new TypeError("audioBuffer must be an AudioBuffer.");let t=e.numberOfChannels,r=e.sampleRate,s=e.length,n=new Float32Array(t*s);for(let o=0;o<t;o++){let u=e.getChannelData(o);n.set(u,o*s)}let a=new AudioData({format:"f32-planar",sampleRate:r,numberOfFrames:s,numberOfChannels:t,timestamp:Math.round(1e6*this._accumulatedFrameCount/r),data:n}),c=this._encoder.digest(a);return a.close(),this._accumulatedFrameCount+=s,c}_flush(){return this._encoder.flush()}},gt=class extends B{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="audio")throw new TypeError("track must be an audio MediaStreamTrack.");super(t.codec),this._encoder=new Te(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:r=>{this._encoder.digest(r),r.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(r=>{r instanceof DOMException&&r.name==="AbortError"||console.error("Pipe error:",r)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},ce=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!Fe.includes(e))throw new TypeError(`Invalid subtitle codec '${e}'. Must be one of: ${Fe.join(", ")}.`);this._codec=e}},Tt=class extends ce{_parser;constructor(e){super(e),this._parser=new ve({codec:e,output:(t,r)=>this._connectedTrack?.output._muxer.addSubtitleCue(this._connectedTrack,t,r),error:t=>console.error("Subtitle parse error:",t)})}digest(e){if(typeof e!="string")throw new TypeError("text must be a string.");return this._ensureValidDigest(),this._parser.parse(e),this._connectedTrack.output._muxer.mutex.currentPromise}};var xt=class{_muxer;_writer;_tracks=[];_started=!1;_finalizing=!1;_mutex=new N;constructor(e){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(!(e.format instanceof Y))throw new TypeError("options.format must be an OutputFormat.");if(!(e.target instanceof G))throw new TypeError("options.target must be a Target.");if(e.target._output)throw new Error("Target is already used for another output.");e.target._output=this,this._writer=e.target._createWriter(),this._muxer=e.format._createMuxer(this)}addVideoTrack(e,t={}){if(!(e instanceof U))throw new TypeError("source must be a VideoSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");if(typeof t.rotation=="number"&&![0,90,180,270].includes(t.rotation))throw new TypeError(`Invalid video rotation: ${t.rotation}. Has to be 0, 90, 180 or 270.`);if(Array.isArray(t.rotation)&&(t.rotation.length!==9||t.rotation.some(r=>!Number.isFinite(r))))throw new TypeError(`Invalid video transformation matrix: ${t.rotation.join()}`);if(t.frameRate!==void 0&&(!Number.isInteger(t.frameRate)||t.frameRate<=0))throw new TypeError(`Invalid video frame rate: ${t.frameRate}. Must be a positive integer.`);this._addTrack("video",e,t)}addAudioTrack(e,t={}){if(!(e instanceof B))throw new TypeError("source must be an AudioSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("audio",e,t)}addSubtitleTrack(e,t={}){if(!(e instanceof ce))throw new TypeError("source must be a SubtitleSource.");if(!t||typeof t!="object")throw new TypeError("metadata must be an object.");this._addTrack("subtitle",e,t)}_addTrack(e,t,r){if(this._started)throw new Error("Cannot add track after output has started.");if(t._connectedTrack)throw new Error("Source is already used for a track.");let s={id:this._tracks.length+1,output:this,type:e,source:t,metadata:r};this._muxer.beforeTrackAdd(s),this._tracks.push(s),t._connectedTrack=s}async start(){if(this._started)throw new Error("Output already started.");this._started=!0,this._writer.start();let e=await this._mutex.acquire();await this._muxer.start();for(let t of this._tracks)t.source._start();e()}async finalize(){if(!this._started)throw new Error("Cannot finalize before starting.");if(this._finalizing)throw new Error("Cannot call finalize twice.");this._finalizing=!0;let e=await this._mutex.acquire(),t=this._tracks.map(r=>r.source._flush());await Promise.all(t),await this._muxer.finalize(),await this._writer.flush(),await this._writer.finalize(),e()}};var xe=class{_sizePromise=null;_getSize(){return this._sizePromise??=this._retrieveSize()}},Ct=class extends xe{constructor(t){super();this.buffer=t}async _read(t,r){return new Uint8Array(this.buffer,t,r-t)}async _retrieveSize(){return this.buffer.byteLength}},St=class extends xe{constructor(t){super();this.blob=t}async _read(t,r){let n=await this.blob.slice(t,r).arrayBuffer();return new Uint8Array(n)}async _retrieveSize(){return this.blob.size}};var ue=class{input;constructor(e){this.input=e}};var Be=class{_backing;constructor(e){this._backing=e}isVideoTrack(){return this instanceof Ce}isAudioTrack(){return this instanceof Se}computeDuration(){return this._backing.computeDuration()}},Ce=class extends Be{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getWidth(){return this._backing.getWidth()}getHeight(){return this._backing.getHeight()}getRotation(){return this._backing.getRotation()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}},Se=class extends Be{_backing;constructor(e){super(e),this._backing=e}getCodec(){return this._backing.getCodec()}getNumberOfChannels(){return this._backing.getNumberOfChannels()}getSampleRate(){return this._backing.getSampleRate()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}};var me=class{constructor(e,t=1/0){this.source=e;this.maxStorableBytes=t}loadedSegments=[];loadingSegments=[];sourceSizePromise=null;nextAge=0;totalStoredBytes=0;async loadRange(e,t){t=Math.min(t,await this.source._getSize());let r=this.loadingSegments.find(o=>o.start<=e&&o.end>=t);if(r){await r.promise;return}if(this.loadedSegments.some(o=>o.start<=e&&o.end>=t))return;let n=this.source._read(e,t),a={start:e,end:t,promise:n};this.loadingSegments.push(a);let c=await n;zt(this.loadingSegments,a),this.insertIntoLoadedSegments(e,c)}insertIntoLoadedSegments(e,t){let r={start:e,end:e+t.byteLength,bytes:t,view:new DataView(t.buffer),age:this.nextAge++},s=I(this.loadedSegments,e,n=>n.start);(s===-1||this.loadedSegments[s].start<r.start)&&s++,this.loadedSegments.splice(s,0,r),this.totalStoredBytes+=t.byteLength;for(let n=s+1;n<this.loadedSegments.length;n++){let a=this.loadedSegments[n];if(a.start>=r.end)break;r.start<=a.start&&a.end<=r.end&&(this.loadedSegments.splice(n,1),n--)}for(;this.totalStoredBytes>this.maxStorableBytes&&this.loadedSegments.length>1;){let n=null,a=-1;for(let c=0;c<this.loadedSegments.length;c++){let o=this.loadedSegments[c];(!n||o.age<n.age)&&(n=o,a=c)}d(n),this.totalStoredBytes-=n.bytes.byteLength,this.loadedSegments.splice(a,1)}}getViewAndOffset(e,t){let r=I(this.loadedSegments,e,n=>n.start),s=null;if(r!==-1)for(let n=r;n<this.loadedSegments.length;n++){let a=this.loadedSegments[n];if(a.start>e)break;if(t<=a.end){s=a;break}}if(!s)throw new Error(`No segment loaded for range [${e}, ${t}).`);return s.age=this.nextAge++,{view:s.view,offset:s.bytes.byteOffset+e-s.start}}forgetRange(e,t){if(t<=e)return;let r=I(this.loadedSegments,e,n=>n.start);if(r===-1)return;let s=this.loadedSegments[r];s.start!==e||s.end!==t||(this.loadedSegments.splice(r,1),this.totalStoredBytes-=s.bytes.byteLength)}};var Z=class{constructor(e){this.reader=e}pos=0;readRange(e,t){let{view:r,offset:s}=this.reader.getViewAndOffset(e,t);return new Uint8Array(r.buffer,s,t-e)}readU8(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+1);return this.pos++,e.getUint8(t)}readU16(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+2);return this.pos+=2,e.getUint16(t,!1)}readU24(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+3);this.pos+=3;let r=e.getUint16(t,!1),s=e.getUint8(t+2);return r*256+s}readS32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getUint32(t,!1)}readI32(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+4);return this.pos+=4,e.getInt32(t,!1)}readU64(){let e=this.readU32(),t=this.readU32();return e*4294967296+t}readF64(){let{view:e,offset:t}=this.reader.getViewAndOffset(this.pos,this.pos+8);return this.pos+=8,e.getFloat64(t,!1)}readFixed_16_16(){return this.readS32()/65536}readFixed_2_30(){return this.readS32()/1073741824}readAscii(e){let{view:t,offset:r}=this.reader.getViewAndOffset(this.pos,this.pos+e);this.pos+=e;let s="";for(let n=0;n<e;n++)s+=String.fromCharCode(t.getUint8(r+n));return s}readIsomVariableInteger(){let e=0;for(let t=0;t<4;t++){e<<=7;let r=this.readU8();if(e|=r&127,!(r&128))break}return e}readBoxHeader(){let e=this.readU32(),t=this.readAscii(4),r=8;return e===1&&(e=this.readU64(),r=16),{name:t,totalSize:e,headerSize:r,contentSize:e-r}}};var Ti=[W(0),W(90),W(180),W(270)],Ne=class extends ue{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new N;chunkReader;constructor(e){super(e),this.isobmffReader=new Z(e._mainReader),this.chunkReader=new Z(new me(e._source,64*2**20))}async computeDuration(){let e=await this.getTracks(),t=await Promise.all(e.map(r=>r.computeDuration()));return Math.max(0,...t)}async getTracks(){return await this.readMetadata(),this.tracks.map(e=>e.inputTrack)}async getMimeType(){await this.readMetadata();let e="video/mp4";if(this.tracks.length>0){let t=await Promise.all(this.tracks.map(s=>s.inputTrack.getCodecMimeType())),r=[...new Set(t)];e+=`; codecs="${r.join(", ")}"`}return e}readMetadata(){return this.metadataPromise??=(async()=>{let e=await this.isobmffReader.reader.source._getSize();for(;this.isobmffReader.pos<e;){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.pos,r=this.isobmffReader.readBoxHeader();if(r.name==="moov"){await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+r.contentSize),this.readContiguousBoxes(r.contentSize);break}this.isobmffReader.pos=t+r.totalSize}if(this.isFragmented){await this.isobmffReader.reader.loadRange(e-4,e),this.isobmffReader.pos=e-4;let t=this.isobmffReader.readU32(),r=e-t;if(r>=0&&r<e){await this.isobmffReader.reader.loadRange(r,e),this.isobmffReader.pos=r;let s=this.isobmffReader.readBoxHeader();s.name==="mfra"&&this.readContiguousBoxes(s.contentSize)}}})()}getSampleTableForTrack(e){if(e.sampleTable)return e.sampleTable;let t={sampleTimingEntries:[],sampleCompositionTimeOffsets:[],sampleSizes:[],keySampleIndices:null,chunkOffsets:[],sampleToChunk:[],presentationTimestamps:[]};e.sampleTable=t,this.isobmffReader.pos=e.sampleTableOffset,this.currentTrack=e,this.traverseBox(),this.currentTrack=null;for(let r of t.sampleTimingEntries)for(let s=0;s<r.count;s++)t.presentationTimestamps.push({presentationTimestamp:r.startDecodeTimestamp+s*r.delta,sampleIndex:r.startIndex+s});for(let r of t.sampleCompositionTimeOffsets)for(let s=0;s<r.count;s++){let n=r.startIndex+s,a=t.presentationTimestamps[n];a&&(a.presentationTimestamp+=r.offset)}return t.presentationTimestamps.sort((r,s)=>r.presentationTimestamp-s.presentationTimestamp),e.sampleTable}async readFragment(){let e=this.isobmffReader.pos;await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let t=this.isobmffReader.readBoxHeader();d(t.name==="moof"),await this.isobmffReader.reader.loadRange(e,e+t.totalSize),this.isobmffReader.pos=e,this.traverseBox();let r=z(this.fragments,e,n=>n.moofOffset);d(r!==-1);let s=this.fragments[r];d(s.moofOffset===e),this.isobmffReader.reader.forgetRange(e,e+t.totalSize);for(let[n,a]of s.trackData){if(a.startTimestampIsFinal)continue;let c=this.tracks.find(l=>l.id===n);this.isobmffReader.pos=0;let o=null,u=null,m=I(c.fragments,e-1,l=>l.moofOffset);for(m!==-1&&(o=c.fragments[m],u=o,this.isobmffReader.pos=o.moofOffset+o.moofSize);this.isobmffReader.pos<e;){if(o?.nextFragment)o=o.nextFragment,this.isobmffReader.pos=o.moofOffset+o.moofSize;else{await this.isobmffReader.reader.loadRange(this.isobmffReader.pos,this.isobmffReader.pos+16);let l=this.isobmffReader.pos,p=this.isobmffReader.readBoxHeader();if(p.name==="moof"){let h=z(this.fragments,l,b=>b.moofOffset);if(h===-1){this.isobmffReader.pos=l;let b=await this.readFragment();o&&(o.nextFragment=b),o=b}else{let b=this.fragments[h];o&&(o.nextFragment=b),o=b}}this.isobmffReader.pos=l+p.totalSize}o&&o.trackData.has(n)&&(u=o)}if(u){let l=u.trackData.get(n);d(l.startTimestampIsFinal),mr(a,l.endTimestamp)}a.startTimestampIsFinal=!0}return s}readContiguousBoxes(e){let t=this.isobmffReader.pos;for(;this.isobmffReader.pos-t<e;)this.traverseBox()}traverseBox(){let e=this.isobmffReader.pos,t=this.isobmffReader.readBoxHeader(),r=e+t.totalSize;switch(t.name){case"mdia":case"minf":case"dinf":case"mfra":this.readContiguousBoxes(t.contentSize);break;case"mvhd":{let s=this.isobmffReader.readU8();this.isobmffReader.pos+=3,s===1?(this.isobmffReader.pos+=16,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU64()):(this.isobmffReader.pos+=8,this.movieTimescale=this.isobmffReader.readU32(),this.movieDurationInTimescale=this.isobmffReader.readU32())}break;case"trak":{let s={id:-1,demuxer:this,inputTrack:null,info:null,timescale:-1,durationInTimescale:-1,rotation:0,sampleTableOffset:-1,sampleTable:null,fragmentLookupTable:null,currentFragmentState:null,fragments:[]};if(this.currentTrack=s,this.readContiguousBoxes(t.contentSize),s.id!==-1&&s.timescale!==-1&&s.info!==null){if(s.info.type==="video"&&s.info.codec!==null){let n=s;s.inputTrack=new Ce(new wt(n)),this.tracks.push(s)}else if(s.info.type==="audio"&&s.info.codec!==null){let n=s;if(s.inputTrack=new Se(new yt(n)),this.tracks.push(s),s.info.codec==="aac"){let a=at(s.info.codecDescription);a.numberOfChannels!==null&&(s.info.numberOfChannels=a.numberOfChannels),a.sampleRate!==null&&(s.info.sampleRate=a.sampleRate)}}}this.currentTrack=null}break;case"tkhd":{let s=this.currentTrack;d(s);let n=this.isobmffReader.readU8();if(!((this.isobmffReader.readU24()&1)!==0))break;if(n===0)this.isobmffReader.pos+=8,s.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=8;else if(n===1)this.isobmffReader.pos+=16,s.id=this.isobmffReader.readU32(),this.isobmffReader.pos+=12;else throw new Error(`Incorrect track header version ${n}.`);this.isobmffReader.pos+=2*4+2+2+2+2;let o=[];o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16()),this.isobmffReader.pos+=4,o.push(this.isobmffReader.readFixed_16_16(),this.isobmffReader.readFixed_16_16());let u=Ti.findIndex(m=>m.every((l,p)=>l===o[p]));u===-1?s.rotation=0:s.rotation=90*u}break;case"mdhd":{let s=this.currentTrack;d(s);let n=this.isobmffReader.readU8();this.isobmffReader.pos+=3,n===0?(this.isobmffReader.pos+=8,s.timescale=this.isobmffReader.readU32(),s.durationInTimescale=this.isobmffReader.readU32()):n===1&&(this.isobmffReader.pos+=16,s.timescale=this.isobmffReader.readU32(),s.durationInTimescale=this.isobmffReader.readU64())}break;case"hdlr":{let s=this.currentTrack;d(s),this.isobmffReader.pos+=8;let n=this.isobmffReader.readAscii(4);n==="vide"?s.info={type:"video",width:-1,height:-1,codec:null,codecDescription:null,colorSpace:null}:n==="soun"&&(s.info={type:"audio",numberOfChannels:-1,sampleRate:-1,codec:null,codecDescription:null})}break;case"stbl":{let s=this.currentTrack;d(s),s.sampleTableOffset=e,this.readContiguousBoxes(t.contentSize)}break;case"stsd":{let s=this.currentTrack;if(d(s),s.info===null||s.sampleTable)break;let n=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=this.isobmffReader.readU32();for(let c=0;c<a;c++){let o=this.isobmffReader.readBoxHeader();if(s.info.type==="video"){if(o.name==="avc1")s.info.codec="avc";else if(o.name==="hvc1"||o.name==="hev1")s.info.codec="hevc";else{console.warn(`Unsupported video sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2+2+2+3*4,s.info.width=this.isobmffReader.readU16(),s.info.height=this.isobmffReader.readU16(),this.isobmffReader.pos+=50,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}else{if(o.name==="mp4a")s.info.codec="aac";else if(o.name.toLowerCase()==="opus")s.info.codec="opus";else{console.warn(`Unsupported audio sample entry type ${o.name}.`);break}this.isobmffReader.pos+=6*1+2;let u=this.isobmffReader.readU16();this.isobmffReader.pos+=3*2;let m=this.isobmffReader.readU16();this.isobmffReader.pos+=6;let l=this.isobmffReader.readU32()/65536;if(n===0&&u>0){if(u===1)this.isobmffReader.pos+=4*4;else if(u===2){this.isobmffReader.pos+=4,l=this.isobmffReader.readF64(),m=this.isobmffReader.readU32(),this.isobmffReader.pos+=4;let p=this.isobmffReader.readU32(),h=this.isobmffReader.readU32(),b=this.isobmffReader.readU32(),k=this.isobmffReader.readU32()}}s.info.numberOfChannels=m,s.info.sampleRate=l,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}}}break;case"avcC":{let s=this.currentTrack;d(s&&s.info),s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"hvcC":{let s=this.currentTrack;d(s&&s.info),s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"colr":{let s=this.currentTrack;if(d(s&&s.info?.type==="video"),this.isobmffReader.readAscii(4)!=="nclx")break;let a=this.isobmffReader.readU16(),c=this.isobmffReader.readU16(),o=this.isobmffReader.readU16(),u=!!(this.isobmffReader.readU8()&128);s.info.colorSpace={primaries:Ft[a],transfer:Mt[c],matrix:Vt[o],fullRange:u}}break;case"wave":t.totalSize>8&&this.readContiguousBoxes(t.contentSize);break;case"esds":{let s=this.currentTrack;d(s&&s.info),this.isobmffReader.pos+=4;let n=this.isobmffReader.readU8();d(n===3),this.isobmffReader.readIsomVariableInteger(),this.isobmffReader.pos+=2;let a=this.isobmffReader.readU8(),c=(a&128)!==0,o=(a&64)!==0,u=(a&32)!==0;if(c&&(this.isobmffReader.pos+=2),o){let b=this.isobmffReader.readU8();this.isobmffReader.pos+=b}u&&(this.isobmffReader.pos+=2);let m=this.isobmffReader.readU8();d(m===4),this.isobmffReader.readIsomVariableInteger();let l=this.isobmffReader.readU8();d(l===64),this.isobmffReader.pos+=12;let p=this.isobmffReader.readU8();d(p===5);let h=this.isobmffReader.readIsomVariableInteger();s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+h)}break;case"stts":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32(),a=0,c=0;for(let o=0;o<n;o++){let u=this.isobmffReader.readU32(),m=this.isobmffReader.readU32();s.sampleTable.sampleTimingEntries.push({startIndex:a,startDecodeTimestamp:c,count:u,delta:m}),a+=u,c+=u*m}}break;case"ctts":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32(),a=0;for(let c=0;c<n;c++){let o=this.isobmffReader.readU32(),u=this.isobmffReader.readI32();s.sampleTable.sampleCompositionTimeOffsets.push({startIndex:a,count:o,offset:u}),a+=o}}break;case"stsz":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32(),a=this.isobmffReader.readU32();if(n===0)for(let c=0;c<a;c++){let o=this.isobmffReader.readU32();s.sampleTable.sampleSizes.push(o)}else s.sampleTable.sampleSizes.push(n)}break;case"stz2":throw new Error("Unsupported.");case"stss":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4,s.sampleTable.keySampleIndices=[];let n=this.isobmffReader.readU32();for(let a=0;a<n;a++){let c=this.isobmffReader.readU32()-1;s.sampleTable.keySampleIndices.push(c)}}break;case"stsc":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32();for(let c=0;c<n;c++){let o=this.isobmffReader.readU32()-1,u=this.isobmffReader.readU32(),m=this.isobmffReader.readU32();s.sampleTable.sampleToChunk.push({startSampleIndex:-1,startChunkIndex:o,samplesPerChunk:u,sampleDescriptionIndex:m})}let a=0;for(let c=0;c<s.sampleTable.sampleToChunk.length;c++)if(s.sampleTable.sampleToChunk[c].startSampleIndex=a,c<s.sampleTable.sampleToChunk.length-1){let u=s.sampleTable.sampleToChunk[c+1].startChunkIndex-s.sampleTable.sampleToChunk[c].startChunkIndex;a+=u*s.sampleTable.sampleToChunk[c].samplesPerChunk}}break;case"stco":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32();for(let a=0;a<n;a++){let c=this.isobmffReader.readU32();s.sampleTable.chunkOffsets.push(c)}}break;case"co64":{let s=this.currentTrack;if(d(s),!s.sampleTable)break;this.isobmffReader.pos+=4;let n=this.isobmffReader.readU32();for(let a=0;a<n;a++){let c=this.isobmffReader.readU64();s.sampleTable.chunkOffsets.push(c)}}break;case"mvex":this.isFragmented=!0,this.readContiguousBoxes(t.contentSize);break;case"mehd":{let s=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32();this.movieDurationInTimescale=n}break;case"trex":{this.isobmffReader.pos+=4;let s=this.isobmffReader.readU32(),n=this.isobmffReader.readU32(),a=this.isobmffReader.readU32(),c=this.isobmffReader.readU32(),o=this.isobmffReader.readU32();this.fragmentTrackDefaults.push({trackId:s,defaultSampleDescriptionIndex:n,defaultSampleDuration:a,defaultSampleSize:c,defaultSampleFlags:o})}break;case"tfra":{let s=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let n=this.isobmffReader.readU32(),a=this.tracks.find(w=>w.id===n);if(!a)break;a.fragmentLookupTable=[];let c=this.isobmffReader.readU32(),o=(c&48)>>4,u=(c&12)>>2,m=c&3,l=this.isobmffReader,p=[l.readU8.bind(l),l.readU16.bind(l),l.readU24.bind(l),l.readU32.bind(l)],h=p[o],b=p[u],k=p[m],g=this.isobmffReader.readU32();for(let w=0;w<g;w++){let v=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),_=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),H=h(),E=b(),F=k();a.fragmentLookupTable.push({timestamp:v,moofOffset:_})}}break;case"moof":{this.currentFragment={moofOffset:e,moofSize:t.totalSize,implicitBaseDataOffset:e,trackData:new Map,dataStart:1/0,dataEnd:0,nextFragment:null},this.readContiguousBoxes(t.contentSize);let s=I(this.fragments,this.currentFragment.moofOffset,n=>n.moofOffset);this.fragments.splice(s+1,0,this.currentFragment);for(let[,n]of this.currentFragment.trackData){let a=n.samples[0],c=A(n.samples);this.currentFragment.dataStart=Math.min(this.currentFragment.dataStart,a.byteOffset),this.currentFragment.dataEnd=Math.max(this.currentFragment.dataEnd,c.byteOffset+c.byteSize)}this.currentFragment=null}break;case"traf":if(d(this.currentFragment),this.readContiguousBoxes(t.contentSize),this.currentTrack){let s=this.currentFragment.trackData.get(this.currentTrack.id);if(s){let n=I(this.currentTrack.fragments,this.currentFragment.moofOffset,c=>c.moofOffset);this.currentTrack.fragments.splice(n+1,0,this.currentFragment);let{currentFragmentState:a}=this.currentTrack;d(a),a.startTimestamp!==null&&(mr(s,a.startTimestamp),s.startTimestampIsFinal=!0)}this.currentTrack.currentFragmentState=null,this.currentTrack=null}break;case"tfhd":{d(this.currentFragment),this.isobmffReader.pos+=1;let s=this.isobmffReader.readU24(),n=!!(s&1),a=!!(s&2),c=!!(s&8),o=!!(s&16),u=!!(s&32),m=!!(s&65536),l=!!(s&131072),p=this.isobmffReader.readU32(),h=this.tracks.find(k=>k.id===p);if(!h)break;let b=this.fragmentTrackDefaults.find(k=>k.trackId===p);this.currentTrack=h,h.currentFragmentState={baseDataOffset:this.currentFragment.implicitBaseDataOffset,sampleDescriptionIndex:b?.defaultSampleDescriptionIndex??null,defaultSampleDuration:b?.defaultSampleDuration??null,defaultSampleSize:b?.defaultSampleSize??null,defaultSampleFlags:b?.defaultSampleFlags??null,startTimestamp:null},n?h.currentFragmentState.baseDataOffset=this.isobmffReader.readU64():l&&(h.currentFragmentState.baseDataOffset=this.currentFragment.moofOffset),a&&(h.currentFragmentState.sampleDescriptionIndex=this.isobmffReader.readU32()),c&&(h.currentFragmentState.defaultSampleDuration=this.isobmffReader.readU32()),o&&(h.currentFragmentState.defaultSampleSize=this.isobmffReader.readU32()),u&&(h.currentFragmentState.defaultSampleFlags=this.isobmffReader.readU32()),m&&(h.currentFragmentState.defaultSampleDuration=0)}break;case"tfdt":{let s=this.currentTrack;if(!s)break;d(s.currentFragmentState);let n=this.isobmffReader.readU8();this.isobmffReader.pos+=3;let a=n===0?this.isobmffReader.readU32():this.isobmffReader.readU64();s.currentFragmentState.startTimestamp=a}break;case"trun":{let s=this.currentTrack;if(!s)break;if(d(this.currentFragment),d(s.currentFragmentState),this.currentFragment.trackData.has(s.id))throw new Error("Can't have two trun boxes for the same track in one fragment.");let n=this.isobmffReader.readU8(),a=this.isobmffReader.readU24(),c=!!(a&1),o=!!(a&4),u=!!(a&256),m=!!(a&512),l=!!(a&1024),p=!!(a&2048),h=this.isobmffReader.readU32(),b=s.currentFragmentState.baseDataOffset;c&&(b+=this.isobmffReader.readI32());let k=null;o&&(k=this.isobmffReader.readU32());let g=b;if(h===0){this.currentFragment.implicitBaseDataOffset=g;break}let w=0,v={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(s.id,v);for(let E=0;E<h;E++){let F;u?F=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleDuration!==null),F=s.currentFragmentState.defaultSampleDuration);let J;m?J=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleSize!==null),J=s.currentFragmentState.defaultSampleSize);let we;l?we=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleFlags!==null),we=s.currentFragmentState.defaultSampleFlags),E===0&&k!==null&&(we=k);let Ge=0;p&&(n===0?Ge=this.isobmffReader.readU32():Ge=this.isobmffReader.readI32());let lr=!(we&65536);v.samples.push({presentationTimestamp:w+Ge,duration:F,byteOffset:g,byteSize:J,isKeyFrame:lr}),g+=J,w+=F}v.presentationTimestamps=v.samples.map((E,F)=>({presentationTimestamp:E.presentationTimestamp,sampleIndex:F})).sort((E,F)=>E.presentationTimestamp-F.presentationTimestamp);let _=v.samples[v.presentationTimestamps[0].sampleIndex],H=v.samples[A(v.presentationTimestamps).sampleIndex];v.startTimestamp=_.presentationTimestamp,v.endTimestamp=H.presentationTimestamp+H.duration,this.currentFragment.implicitBaseDataOffset=g}break}this.isobmffReader.pos=r}},We=class{constructor(e){this.internalTrack=e}chunkToSampleIndex=new WeakMap;sampleIndexToChunk=new Map;chunkToFragmentLocation=new WeakMap;fragmentLocationToChunk=new Map;getCodec(){throw new Error("Not implemented on base class.")}async computeDuration(){let t=(await this.getChunk(1/0,{metadataOnly:!0}))?.timestamp;return t?t/1e6:0}async getFirstChunk(e){return this.internalTrack.demuxer.isFragmented?this.performFragmentedLookup(()=>{let t=this.internalTrack.fragments[0];return{fragmentIndex:t?0:-1,sampleIndex:t?0:-1,correctSampleFound:!!t}},0,1/0,e):this.fetchChunkForSampleIndex(0,e)}async getChunk(e,t){let r=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findSampleInFragmentsForTimestamp(r),r,r,t);{let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=ur(s,r);return this.fetchChunkForSampleIndex(n,t)}}async getNextChunk(e,t){if(this.internalTrack.demuxer.isFragmented){let s=this.chunkToFragmentLocation.get(e);if(s===void 0)throw new Error("Chunk was not created from this track.");let n=s.fragment.trackData.get(this.internalTrack.id),a=n.samples[s.sampleIndex],c=z(this.internalTrack.fragments,s.fragment.moofOffset,o=>o.moofOffset);return d(c!==-1),this.performFragmentedLookup(()=>{if(s.sampleIndex+1<n.samples.length)return{fragmentIndex:c,sampleIndex:s.sampleIndex+1,correctSampleFound:!0};{let o=s.fragment;for(;o.nextFragment;)if(o=o.nextFragment,o.trackData.get(this.internalTrack.id)){let m=z(this.internalTrack.fragments,o.moofOffset,l=>l.moofOffset);return d(m!==-1),{fragmentIndex:m,sampleIndex:0,correctSampleFound:!0}}return{fragmentIndex:c,sampleIndex:-1,correctSampleFound:!1}}},a.presentationTimestamp,1/0,t)}let r=this.chunkToSampleIndex.get(e);if(r===void 0)throw new Error("Chunk was not created from this track.");return this.fetchChunkForSampleIndex(r+1,t)}async getKeyChunk(e,t){let r=e*this.internalTrack.timescale;if(this.internalTrack.demuxer.isFragmented)return this.performFragmentedLookup(()=>this.findKeySampleInFragmentsForTimestamp(r),r,r,t);let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=ur(s,r),a=n===-1?-1:Ci(s,n);return this.fetchChunkForSampleIndex(a,t)}async getNextKeyChunk(e,t){if(this.internalTrack.demuxer.isFragmented){let a=this.chunkToFragmentLocation.get(e);if(a===void 0)throw new Error("Chunk was not created from this track.");let c=a.fragment.trackData.get(this.internalTrack.id),o=c.samples[a.sampleIndex],u=z(this.internalTrack.fragments,a.fragment.moofOffset,m=>m.moofOffset);return d(u!==-1),this.performFragmentedLookup(()=>{let m=c.samples.findIndex((l,p)=>l.isKeyFrame&&p>a.sampleIndex);if(m!==-1)return{fragmentIndex:u,sampleIndex:m,correctSampleFound:!0};{let l=a.fragment;for(;l.nextFragment;){l=l.nextFragment;let p=l.trackData.get(this.internalTrack.id);if(p){let h=z(this.internalTrack.fragments,l.moofOffset,k=>k.moofOffset);d(h!==-1);let b=p.samples.findIndex(k=>k.isKeyFrame);if(b===-1)throw new Error("Not supported: Fragment does not contain key sample.");return{fragmentIndex:h,sampleIndex:b,correctSampleFound:!0}}}return{fragmentIndex:u,sampleIndex:-1,correctSampleFound:!1}}},o.presentationTimestamp,1/0,t)}let r=this.chunkToSampleIndex.get(e);if(r===void 0)throw new Error("Chunk was not created from this track.");let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=Si(s,r);return this.fetchChunkForSampleIndex(n,t)}async fetchChunkForSampleIndex(e,t){if(e===-1)return null;let r=this.sampleIndexToChunk.get(e)?.deref();if(r)return r;let s=this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack),n=xi(s,e);if(!n)return null;let a;t.metadataOnly?a=new Uint8Array(0):(await this.internalTrack.demuxer.chunkReader.reader.loadRange(n.chunkOffset,n.chunkOffset+n.chunkSize),a=this.internalTrack.demuxer.chunkReader.readRange(n.sampleOffset,n.sampleOffset+n.sampleSize));let c=1e6*n.presentationTimestamp/this.internalTrack.timescale,o=1e6*n.duration/this.internalTrack.timescale,u=this.createChunk(a,c,o,n.isKeyFrame);return this.chunkToSampleIndex.set(u,e),this.sampleIndexToChunk.set(e,new WeakRef(u)),u}async fetchChunkInFragment(e,t,r){if(t===-1)return null;let s=`${e.moofOffset}:${t}`,n=this.fragmentLocationToChunk.get(s)?.deref();if(n)return n;let c=e.trackData.get(this.internalTrack.id).samples[t];d(c);let o;r.metadataOnly?o=new Uint8Array(0):(await this.internalTrack.demuxer.chunkReader.reader.loadRange(e.dataStart,e.dataEnd),o=this.internalTrack.demuxer.chunkReader.readRange(c.byteOffset,c.byteOffset+c.byteSize));let u=1e6*c.presentationTimestamp/this.internalTrack.timescale,m=1e6*c.duration/this.internalTrack.timescale,l=this.createChunk(o,u,m,c.isKeyFrame);return this.chunkToFragmentLocation.set(l,{fragment:e,sampleIndex:t}),this.fragmentLocationToChunk.set(s,new WeakRef(l)),l}findSampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,n=>n.trackData.get(this.internalTrack.id).startTimestamp),r=-1,s=!1;if(t!==-1){let a=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=I(a.presentationTimestamps,e,o=>o.presentationTimestamp);d(c!==-1),r=a.presentationTimestamps[c].sampleIndex,s=e<a.endTimestamp}return{fragmentIndex:t,sampleIndex:r,correctSampleFound:s}}findKeySampleInFragmentsForTimestamp(e){let t=I(this.internalTrack.fragments,e,n=>n.trackData.get(this.internalTrack.id).startTimestamp),r=-1,s=!1;if(t!==-1){let a=this.internalTrack.fragments[t].trackData.get(this.internalTrack.id),c=a.presentationTimestamps.findLastIndex(u=>a.samples[u.sampleIndex].isKeyFrame&&u.presentationTimestamp<=e);if(c===-1)throw new Error("Not supported: Fragment does not begin with a key sample.");r=a.presentationTimestamps[c].sampleIndex,s=e<a.endTimestamp}return{fragmentIndex:t,sampleIndex:r,correctSampleFound:s}}async performFragmentedLookup(e,t,r,s){let n=this.internalTrack.demuxer,a=await n.fragmentLookupMutex.acquire();try{let{fragmentIndex:c,sampleIndex:o,correctSampleFound:u}=e();if(u){let g=this.internalTrack.fragments[c];return this.fetchChunkInFragment(g,o,s)}let m=n.isobmffReader,l=await m.reader.source._getSize(),p=null,h=c,b=o,k=null;if(this.internalTrack.fragmentLookupTable){let g=I(this.internalTrack.fragmentLookupTable,t,w=>w.timestamp);g!==-1&&(k=this.internalTrack.fragmentLookupTable[g])}if(c===-1)m.pos=k?.moofOffset??0;else{let g=this.internalTrack.fragments[c];!k||g.moofOffset>=g.moofOffset?(m.pos=g.moofOffset+g.moofSize,p=g):m.pos=k.moofOffset}for(;m.pos<l;){if(p){let v=p.trackData.get(this.internalTrack.id);if(v&&v.startTimestamp>r)break;if(p.nextFragment){m.pos=p.nextFragment.moofOffset+p.nextFragment.moofSize,p=p.nextFragment;continue}}await m.reader.loadRange(m.pos,m.pos+16);let g=m.pos,w=m.readBoxHeader();if(w.name==="moof"){let v=z(n.fragments,g,_=>_.moofOffset);if(v===-1){m.pos=g;let _=await n.readFragment();p&&(p.nextFragment=_),p=_;let{fragmentIndex:H,sampleIndex:E,correctSampleFound:F}=e();if(F){let J=this.internalTrack.fragments[H];return this.fetchChunkInFragment(J,E,s)}H!==-1&&(h=H,b=E)}else{let _=n.fragments[v];p&&(p.nextFragment=_),p=_}}m.pos=g+w.totalSize}if(h!==-1){let g=this.internalTrack.fragments[h];return this.fetchChunkInFragment(g,b,s)}return null}finally{a()}}},wt=class extends We{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getWidth(){return this.internalTrack.info.width}async getHeight(){return this.internalTrack.info.height}async getRotation(){return this.internalTrack.rotation}async getDecoderConfig(){return{codec:er(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),codedWidth:this.internalTrack.info.width,codedHeight:this.internalTrack.info.height,description:this.internalTrack.info.codecDescription??void 0,colorSpace:this.internalTrack.info.colorSpace??void 0}}createChunk(e,t,r,s){return new EncodedVideoChunk({data:e,timestamp:t,duration:r,type:s?"key":"delta"})}},yt=class extends We{internalTrack;constructor(e){super(e),this.internalTrack=e}async getCodec(){return this.internalTrack.info.codec}async getNumberOfChannels(){return this.internalTrack.info.numberOfChannels}async getSampleRate(){return this.internalTrack.info.sampleRate}async getDecoderConfig(){return{codec:rr(this.internalTrack.info.codec,this.internalTrack.info.codecDescription),numberOfChannels:this.internalTrack.info.numberOfChannels,sampleRate:this.internalTrack.info.sampleRate,description:this.internalTrack.info.codecDescription??void 0}}createChunk(e,t,r,s){return new EncodedAudioChunk({data:e,timestamp:t,duration:r,type:s?"key":"delta"})}},ur=(i,e)=>{let t=I(i.presentationTimestamps,e,r=>r.presentationTimestamp);return t===-1?-1:i.presentationTimestamps[t].sampleIndex},xi=(i,e)=>{let t=I(i.sampleTimingEntries,e,k=>k.startIndex),r=i.sampleTimingEntries[t];if(!r||r.startIndex+r.count<=e)return null;let n=r.startDecodeTimestamp+(e-r.startIndex)*r.delta,a=I(i.sampleCompositionTimeOffsets,e,k=>k.startIndex),c=i.sampleCompositionTimeOffsets[a];c&&(n+=c.offset);let o=i.sampleSizes[Math.min(e,i.sampleSizes.length-1)],u=I(i.sampleToChunk,e,k=>k.startSampleIndex),m=i.sampleToChunk[u];d(m);let l=m.startChunkIndex+Math.floor((e-m.startSampleIndex)/m.samplesPerChunk),p=i.chunkOffsets[l],h=0,b=p;if(i.sampleSizes.length===1)b+=o*(e-m.startSampleIndex),h+=o*m.samplesPerChunk;else{let k=m.startSampleIndex+(l-m.startChunkIndex)*m.samplesPerChunk;for(let g=k;g<k+m.samplesPerChunk;g++){let w=i.sampleSizes[g];g<e&&(b+=w),h+=w}}return{presentationTimestamp:n,duration:r.delta,sampleOffset:b,sampleSize:o,chunkOffset:p,chunkSize:h,isKeyFrame:i.keySampleIndices?z(i.keySampleIndices,e,k=>k)!==-1:!0}},Ci=(i,e)=>{if(!i.keySampleIndices)return e;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t]??-1},Si=(i,e)=>{if(!i.keySampleIndices)return e+1;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t+1]??-1},mr=(i,e)=>{i.startTimestamp+=e,i.endTimestamp+=e;for(let t of i.samples)t.presentationTimestamp+=e;for(let t of i.presentationTimestamps)t.presentationTimestamp+=e};var He=class extends ue{};var Le=class{},vt=class extends Le{async _canReadInput(e){if(await e._mainReader.source._getSize()<8)return!1;let r=new Z(e._mainReader);return r.pos=4,r.readAscii(4)==="ftyp"}_createDemuxer(e){return new Ne(e)}},It=class extends Le{async _canReadInput(){return!1}_createDemuxer(e){return new He(e)}},Ke=new vt,wi=Ke,yi=Ke,At=new It,dr=At,vi=At,Ii=[Ke,dr];var Rt=class{_source;_formats;_mainReader;_demuxerPromise=null;_format=null;constructor(e){this._formats=e.formats,this._source=e.source,this._mainReader=new me(e.source)}_getDemuxer(){return this._demuxerPromise??=(async()=>{await this._mainReader.loadRange(0,4096);for(let e of this._formats)if(await e._canReadInput(this))return this._format=e,e._createDemuxer(this);throw new Error("Input has an unrecognizable format.")})()}async getFormat(){return await this._getDemuxer(),d(this._format),this._format}async computeDuration(){return(await this._getDemuxer()).computeDuration()}async getTracks(){return(await this._getDemuxer()).getTracks()}async getVideoTracks(){return(await this.getTracks()).filter(t=>t.isVideoTrack())}async getPrimaryVideoTrack(){return(await this.getTracks()).find(t=>t.isVideoTrack())??null}async getAudioTracks(){return(await this.getTracks()).filter(t=>t.isAudioTrack())}async getPrimaryAudioTrack(){return(await this.getTracks()).find(t=>t.isAudioTrack())??null}async getMimeType(){return(await this._getDemuxer()).getMimeType()}};var $e=class{async*chunks(e,t=1/0){let r=[],{promise:s,resolve:n}=q(),{promise:a,resolve:c}=q(),o=!1,u=[],m=()=>Math.max(2,u.length);(async()=>{let l=e??await this.getFirstChunk();for(;l&&!o&&!(l.timestamp/1e6>=t);){if(r.length>m()){({promise:a,resolve:c}=q()),await a;continue}r.push(l),n(),{promise:s,resolve:n}=q(),l=await this.getNextChunk(l)}o=!0,n()})();try{for(;;)if(r.length>0){yield r.shift();let l=performance.now();for(u.push(l);u.length>0&&l-u[0]>=1e3;)u.shift();c()}else if(!o)await s;else break}finally{o=!0,c()}}},Qe=class{async getKeyMediaFrame(e){let t=null,r=await this.createDecoder(a=>t=a),n=await this.createChunkDrain().getKeyChunk(e);return n?(r.decode(n),await r.flush(),r.close(),t):null}async getMediaFrame(e){let t=null,r=await this.createDecoder(o=>{o.timestamp/1e6<=e?(t?.close(),t=o):o.close()}),s=this.createChunkDrain(),n=await s.getKeyChunk(e);if(!n)return null;let a=await s.getChunk(e);d(a),r.decode(n);let c=n;for(;c!==a;){let o=await s.getNextChunk(c);d(o),c=o,r.decode(o),r.decodeQueueSize>=10&&await new Promise(u=>r.addEventListener("dequeue",u,{once:!0}))}return await r.flush(),r.close(),t}async*mediaFrames(e=0,t=1/0){let r=[],s=!1,n=null,{promise:a,resolve:c}=q(),o=!1,u=await this.createDecoder(h=>{let b=h.timestamp/1e6;if(b>=t&&(o=!0),o){h.close();return}n&&(b>e?(r.push(n),s=!0):n.close()),b>=e&&(r.push(h),s=!0),n=s?null:h,r.length>0&&(c(),{promise:a,resolve:c}=q())}),m=this.createChunkDrain(),l=await m.getKeyChunk(e)??await m.getFirstChunk();if(!l)return;let p=!1;(async()=>{let h=l,b=1/0;if(t<1/0){let g=await m.getChunk(t),w=g?g.type==="key"&&g.timestamp/1e6===t?g:await m.getNextKeyChunk(g):null;w&&(b=w.timestamp/1e6)}let k=m.chunks(l,b);for(await k.next();h&&!o;){u.decode(h),u.decodeQueueSize>=10&&await new Promise(w=>u.addEventListener("dequeue",w,{once:!0}));let g=await k.next();if(g.done)break;h=g.value}await k.return(),await u.flush(),u.close(),!s&&n&&r.push(n),p=!0,c()})();try{for(;;)if(r.length>0)yield r.shift();else if(!p)await a;else break}finally{o=!0}}},je=class extends $e{constructor(t){super();this.videoTrack=t}getFirstChunk(t={}){return this.videoTrack._backing.getFirstChunk(t)}getChunk(t,r={}){return this.videoTrack._backing.getChunk(t,r)}getNextChunk(t,r={}){return this.videoTrack._backing.getNextChunk(t,r)}getKeyChunk(t,r={}){return this.videoTrack._backing.getKeyChunk(t,r)}getNextKeyChunk(t,r={}){return this.videoTrack._backing.getNextKeyChunk(t,r)}},Ot=class extends Qe{constructor(t){super();this.videoTrack=t}decoderConfig=null;async createDecoder(t){this.decoderConfig||(this.decoderConfig=await this.videoTrack.getDecoderConfig());let r=new VideoDecoder({output:t,error:s=>console.error(s)});return r.configure(this.decoderConfig),r}createChunkDrain(){return new je(this.videoTrack)}getKeyFrame(t){return this.getKeyMediaFrame(t)}getFrame(t){return this.getMediaFrame(t)}frames(t=0,r=1/0){return this.mediaFrames(t,r)}},qe=class extends $e{constructor(t){super();this.audioTrack=t}getFirstChunk(t={}){return this.audioTrack._backing.getFirstChunk(t)}getChunk(t,r={}){return this.audioTrack._backing.getChunk(t,r)}getNextChunk(t,r={}){return this.audioTrack._backing.getNextChunk(t,r)}getKeyChunk(t,r={}){return this.audioTrack._backing.getKeyChunk(t,r)}getNextKeyChunk(t,r={}){return this.audioTrack._backing.getNextKeyChunk(t,r)}},Xe=class extends Qe{constructor(t){super();this.audioTrack=t}decoderConfig=null;async createDecoder(t){this.decoderConfig||(this.decoderConfig=await this.audioTrack.getDecoderConfig());let r=new AudioDecoder({output:t,error:s=>console.error(s)});return r.configure(this.decoderConfig),r}createChunkDrain(){return new qe(this.audioTrack)}getKeyData(t){return this.getKeyMediaFrame(t)}getData(t){return this.getMediaFrame(t)}data(t=0,r=1/0){return this.mediaFrames(t,r)}},_t=class{constructor(e){this.audioTrack=e;this.audioDataDrain=new Xe(e)}audioDataDrain;audioDataToWrappedArrayBuffer(e){if(!e)return null;let t=new AudioBuffer({numberOfChannels:e.numberOfChannels,length:e.numberOfFrames,sampleRate:e.sampleRate});for(let r=0;r<e.numberOfChannels;r++){let s=new Float32Array(e.allocationSize({planeIndex:r}));e.copyTo(s,{planeIndex:r}),t.copyToChannel(s,r)}return{buffer:t,timestamp:e.timestamp/1e6}}async getBuffer(e){let t=await this.audioDataDrain.getData(e);return this.audioDataToWrappedArrayBuffer(t)}async*buffers(e=0,t=1/0){for await(let r of this.audioDataDrain.data(e,t)){let s=this.audioDataToWrappedArrayBuffer(r);r.close(),yield s}}};export{Ii as ALL_FORMATS,se as AUDIO_CODECS,Ct as ArrayBufferSource,he as ArrayBufferTarget,_t as AudioBufferDrain,kt as AudioBufferSource,Xe as AudioDataDrain,bt as AudioDataSource,B as AudioSource,St as BlobSource,ft as CanvasSource,qe as EncodedAudioChunkDrain,ht as EncodedAudioChunkSource,je as EncodedVideoChunkDrain,dt as EncodedVideoChunkSource,Ke as ISOBMFF,Rt as Input,At as MATROSKA,dr as MKV,yi as MOV,wi as MP4,oe as MediaSource,gt as MediaStreamAudioTrackSource,pt as MediaStreamVideoTrackSource,Ue as MkvOutputFormat,mt as Mp4OutputFormat,xt as Output,Y as OutputFormat,Fe as SUBTITLE_CODECS,xe as Source,nt as StreamTarget,ce as SubtitleSource,G as Target,Tt as TextSubtitleSource,ie as VIDEO_CODECS,Ot as VideoFrameDrain,lt as VideoFrameSource,U as VideoSource,vi as WEBM,ae as WebMOutputFormat};
diff --git a/dist/metamuxer.mjs b/dist/metamuxer.mjs
index 200e194..9f4f769 100644
--- a/dist/metamuxer.mjs
+++ b/dist/metamuxer.mjs
@@ -1749,11 +1749,8 @@ var buildAudioCodecString = (codec, numberOfChannels, sampleRate) => {
 };
 var extractAudioCodecString = (codec, description) => {
   if (codec === "aac") {
-    if (!description || description.byteLength < 2) {
-      throw new TypeError("AAC description must be at least 2 bytes long.");
-    }
-    const mpeg4AudioObjectType = description[0] >> 3;
-    return `mp4a.40.${mpeg4AudioObjectType}`;
+    const audioSpecificConfig = parseAacAudioSpecificConfig(description);
+    return `mp4a.40.${audioSpecificConfig.objectType}`;
   } else if (codec === "opus") {
     return "opus";
   } else if (codec === "vorbis") {
@@ -1761,6 +1758,66 @@ var extractAudioCodecString = (codec, description) => {
   }
   throw new TypeError(`Unhandled codec '${codec}'.`);
 };
+var parseAacAudioSpecificConfig = (bytes2) => {
+  if (!bytes2 || bytes2.byteLength < 2) {
+    throw new TypeError("AAC description must be at least 2 bytes long.");
+  }
+  let bitOffset = 0;
+  let objectType = readBits(bytes2, bitOffset, bitOffset + 5);
+  bitOffset += 5;
+  if (objectType === 31) {
+    objectType = 32 + readBits(bytes2, bitOffset, bitOffset + 6);
+    bitOffset += 6;
+  }
+  const frequencyIndex = readBits(bytes2, bitOffset, bitOffset + 4);
+  bitOffset += 4;
+  let sampleRate = null;
+  if (frequencyIndex === 15) {
+    sampleRate = readBits(bytes2, bitOffset, bitOffset + 24);
+    bitOffset += 24;
+  } else {
+    const freqTable = [
+      96e3,
+      88200,
+      64e3,
+      48e3,
+      44100,
+      32e3,
+      24e3,
+      22050,
+      16e3,
+      12e3,
+      11025,
+      8e3,
+      7350
+    ];
+    if (frequencyIndex < freqTable.length) {
+      sampleRate = freqTable[frequencyIndex];
+    }
+  }
+  const channelConfiguration = readBits(bytes2, bitOffset, bitOffset + 4);
+  bitOffset += 4;
+  let numberOfChannels = null;
+  if (channelConfiguration >= 1 && channelConfiguration <= 7) {
+    const channelMap = {
+      1: 1,
+      2: 2,
+      3: 3,
+      4: 4,
+      5: 5,
+      6: 6,
+      7: 8
+    };
+    numberOfChannels = channelMap[channelConfiguration];
+  }
+  return {
+    objectType,
+    frequencyIndex,
+    sampleRate,
+    channelConfiguration,
+    numberOfChannels
+  };
+};
 var getVideoEncoderConfigExtension = (codec) => {
   if (codec === "avc") {
     return {
@@ -4025,8 +4082,8 @@ var InputTrack = class {
   isAudioTrack() {
     return this instanceof InputAudioTrack;
   }
-  getDuration() {
-    return this._backing.getDuration();
+  computeDuration() {
+    return this._backing.computeDuration();
   }
 };
 var InputVideoTrack = class extends InputTrack {
@@ -4304,12 +4361,10 @@ var IsobmffDemuxer = class extends Demuxer {
     this.isobmffReader = new IsobmffReader(input._mainReader);
     this.chunkReader = new IsobmffReader(new Reader(input._source, 64 * 2 ** 20));
   }
-  async getDuration() {
-    await this.readMetadata();
-    if (this.movieDurationInTimescale === -1) {
-      throw new Error("Could not read movie duration.");
-    }
-    return this.movieDurationInTimescale / this.movieTimescale;
+  async computeDuration() {
+    const tracks = await this.getTracks();
+    const trackDurations = await Promise.all(tracks.map((x) => x.computeDuration()));
+    return Math.max(0, ...trackDurations);
   }
   async getTracks() {
     await this.readMetadata();
@@ -4527,6 +4582,15 @@ var IsobmffDemuxer = class extends Demuxer {
               const audioTrack = track;
               track.inputTrack = new InputAudioTrack(new IsobmffAudioTrackBacking(audioTrack));
               this.tracks.push(track);
+              if (track.info.codec === "aac") {
+                const audioSpecificConfig = parseAacAudioSpecificConfig(track.info.codecDescription);
+                if (audioSpecificConfig.numberOfChannels !== null) {
+                  track.info.numberOfChannels = audioSpecificConfig.numberOfChannels;
+                }
+                if (audioSpecificConfig.sampleRate !== null) {
+                  track.info.sampleRate = audioSpecificConfig.sampleRate;
+                }
+              }
             }
           }
           this.currentTrack = null;
@@ -5233,38 +5297,12 @@ var IsobmffTrackBacking = class {
   getCodec() {
     throw new Error("Not implemented on base class.");
   }
-  async getDuration() {
-    return this.internalTrack.durationInTimescale / this.internalTrack.timescale;
+  async computeDuration() {
+    const lastChunk = await this.getChunk(Infinity, { metadataOnly: true });
+    const timestamp = lastChunk?.timestamp;
+    return timestamp ? timestamp / 1e6 : 0;
   }
-};
-var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
-  internalTrack;
-  constructor(internalTrack) {
-    super(internalTrack);
-    this.internalTrack = internalTrack;
-  }
-  async getCodec() {
-    return this.internalTrack.info.codec;
-  }
-  async getWidth() {
-    return this.internalTrack.info.width;
-  }
-  async getHeight() {
-    return this.internalTrack.info.height;
-  }
-  async getRotation() {
-    return this.internalTrack.rotation;
-  }
-  async getDecoderConfig() {
-    return {
-      codec: extractVideoCodecString(this.internalTrack.info.codec, this.internalTrack.info.codecDescription),
-      codedWidth: this.internalTrack.info.width,
-      codedHeight: this.internalTrack.info.height,
-      description: this.internalTrack.info.codecDescription ?? void 0,
-      colorSpace: this.internalTrack.info.colorSpace ?? void 0
-    };
-  }
-  async getFirstChunk() {
+  async getFirstChunk(options) {
     if (this.internalTrack.demuxer.isFragmented) {
       return this.performFragmentedLookup(
         () => {
@@ -5276,26 +5314,28 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
           };
         },
         0,
-        Infinity
+        Infinity,
+        options
       );
     }
-    return this.fetchChunkForSampleIndex(0);
+    return this.fetchChunkForSampleIndex(0, options);
   }
-  async getChunk(timestamp) {
+  async getChunk(timestamp, options) {
     const timestampInTimescale = timestamp * this.internalTrack.timescale;
     if (this.internalTrack.demuxer.isFragmented) {
       return this.performFragmentedLookup(
         () => this.findSampleInFragmentsForTimestamp(timestampInTimescale),
         timestampInTimescale,
-        timestampInTimescale
+        timestampInTimescale,
+        options
       );
     } else {
       const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
       const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
-      return this.fetchChunkForSampleIndex(sampleIndex);
+      return this.fetchChunkForSampleIndex(sampleIndex, options);
     }
   }
-  async getNextChunk(chunk) {
+  async getNextChunk(chunk, options) {
     if (this.internalTrack.demuxer.isFragmented) {
       const locationInFragment = this.chunkToFragmentLocation.get(chunk);
       if (locationInFragment === void 0) {
@@ -5344,30 +5384,32 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
           }
         },
         sample.presentationTimestamp,
-        Infinity
+        Infinity,
+        options
       );
     }
     const sampleIndex = this.chunkToSampleIndex.get(chunk);
     if (sampleIndex === void 0) {
       throw new Error("Chunk was not created from this track.");
     }
-    return this.fetchChunkForSampleIndex(sampleIndex + 1);
+    return this.fetchChunkForSampleIndex(sampleIndex + 1, options);
   }
-  async getKeyChunk(timestamp) {
+  async getKeyChunk(timestamp, options) {
     const timestampInTimescale = timestamp * this.internalTrack.timescale;
     if (this.internalTrack.demuxer.isFragmented) {
       return this.performFragmentedLookup(
         () => this.findKeySampleInFragmentsForTimestamp(timestampInTimescale),
         timestampInTimescale,
-        timestampInTimescale
+        timestampInTimescale,
+        options
       );
     }
     const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
     const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
     const keyFrameSampleIndex = sampleIndex === -1 ? -1 : getRelevantKeyframeIndexForSample(sampleTable, sampleIndex);
-    return this.fetchChunkForSampleIndex(keyFrameSampleIndex);
+    return this.fetchChunkForSampleIndex(keyFrameSampleIndex, options);
   }
-  async getNextKeyChunk(chunk) {
+  async getNextKeyChunk(chunk, options) {
     if (this.internalTrack.demuxer.isFragmented) {
       const locationInFragment = this.chunkToFragmentLocation.get(chunk);
       if (locationInFragment === void 0) {
@@ -5423,7 +5465,8 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
           }
         },
         sample.presentationTimestamp,
-        Infinity
+        Infinity,
+        options
       );
     }
     const sampleIndex = this.chunkToSampleIndex.get(chunk);
@@ -5432,9 +5475,9 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
     }
     const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
     const nextKeyFrameSampleIndex = getNextKeyframeIndexForSample(sampleTable, sampleIndex);
-    return this.fetchChunkForSampleIndex(nextKeyFrameSampleIndex);
+    return this.fetchChunkForSampleIndex(nextKeyFrameSampleIndex, options);
   }
-  async fetchChunkForSampleIndex(sampleIndex) {
+  async fetchChunkForSampleIndex(sampleIndex, options) {
     if (sampleIndex === -1) {
       return null;
     }
@@ -5447,25 +5490,27 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
     if (!sampleInfo) {
       return null;
     }
-    await this.internalTrack.demuxer.chunkReader.reader.loadRange(
-      sampleInfo.chunkOffset,
-      sampleInfo.chunkOffset + sampleInfo.chunkSize
-    );
-    const data = this.internalTrack.demuxer.chunkReader.readRange(
-      sampleInfo.sampleOffset,
-      sampleInfo.sampleOffset + sampleInfo.sampleSize
-    );
-    const chunk = new EncodedVideoChunk({
-      data,
-      timestamp: 1e6 * sampleInfo.presentationTimestamp / this.internalTrack.timescale,
-      duration: 1e6 * sampleInfo.duration / this.internalTrack.timescale,
-      type: sampleInfo.isKeyFrame ? "key" : "delta"
-    });
+    let data;
+    if (options.metadataOnly) {
+      data = new Uint8Array(0);
+    } else {
+      await this.internalTrack.demuxer.chunkReader.reader.loadRange(
+        sampleInfo.chunkOffset,
+        sampleInfo.chunkOffset + sampleInfo.chunkSize
+      );
+      data = this.internalTrack.demuxer.chunkReader.readRange(
+        sampleInfo.sampleOffset,
+        sampleInfo.sampleOffset + sampleInfo.sampleSize
+      );
+    }
+    const timestamp = 1e6 * sampleInfo.presentationTimestamp / this.internalTrack.timescale;
+    const duration = 1e6 * sampleInfo.duration / this.internalTrack.timescale;
+    const chunk = this.createChunk(data, timestamp, duration, sampleInfo.isKeyFrame);
     this.chunkToSampleIndex.set(chunk, sampleIndex);
     this.sampleIndexToChunk.set(sampleIndex, new WeakRef(chunk));
     return chunk;
   }
-  async fetchChunkInFragment(fragment, sampleIndex) {
+  async fetchChunkInFragment(fragment, sampleIndex, options) {
     if (sampleIndex === -1) {
       return null;
     }
@@ -5477,17 +5522,19 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
     const trackData = fragment.trackData.get(this.internalTrack.id);
     const sample = trackData.samples[sampleIndex];
     assert(sample);
-    await this.internalTrack.demuxer.chunkReader.reader.loadRange(fragment.dataStart, fragment.dataEnd);
-    const data = this.internalTrack.demuxer.chunkReader.readRange(
-      sample.byteOffset,
-      sample.byteOffset + sample.byteSize
-    );
-    const chunk = new EncodedVideoChunk({
-      data,
-      timestamp: 1e6 * sample.presentationTimestamp / this.internalTrack.timescale,
-      duration: 1e6 * sample.duration / this.internalTrack.timescale,
-      type: sample.isKeyFrame ? "key" : "delta"
-    });
+    let data;
+    if (options.metadataOnly) {
+      data = new Uint8Array(0);
+    } else {
+      await this.internalTrack.demuxer.chunkReader.reader.loadRange(fragment.dataStart, fragment.dataEnd);
+      data = this.internalTrack.demuxer.chunkReader.readRange(
+        sample.byteOffset,
+        sample.byteOffset + sample.byteSize
+      );
+    }
+    const timestamp = 1e6 * sample.presentationTimestamp / this.internalTrack.timescale;
+    const duration = 1e6 * sample.duration / this.internalTrack.timescale;
+    const chunk = this.createChunk(data, timestamp, duration, sample.isKeyFrame);
     this.chunkToFragmentLocation.set(chunk, { fragment, sampleIndex });
     this.fragmentLocationToChunk.set(compositeKey, new WeakRef(chunk));
     return chunk;
@@ -5527,10 +5574,10 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
       const trackData = fragment.trackData.get(this.internalTrack.id);
       const index = trackData.presentationTimestamps.findLastIndex((x) => {
         const sample = trackData.samples[x.sampleIndex];
-        return sample.isKeyFrame;
+        return sample.isKeyFrame && x.presentationTimestamp <= timestampInTimescale;
       });
       if (index === -1) {
-        throw new Error("Not supported: Fragment does not contain key sample.");
+        throw new Error("Not supported: Fragment does not begin with a key sample.");
       }
       const entry = trackData.presentationTimestamps[index];
       sampleIndex = entry.sampleIndex;
@@ -5539,15 +5586,15 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
     return { fragmentIndex, sampleIndex, correctSampleFound };
   }
   /** Looks for a sample in the fragments while trying to load as few fragments as possible to retrieve it. */
-  async performFragmentedLookup(getBestMatch, earliestTimestamp, latestTimestamp) {
-    const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
-    if (correctSampleFound) {
-      const fragment = this.internalTrack.fragments[fragmentIndex];
-      return this.fetchChunkInFragment(fragment, sampleIndex);
-    }
+  async performFragmentedLookup(getBestMatch, searchTimestamp, latestTimestamp, options) {
     const demuxer = this.internalTrack.demuxer;
     const release = await demuxer.fragmentLookupMutex.acquire();
     try {
+      const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
+      if (correctSampleFound) {
+        const fragment = this.internalTrack.fragments[fragmentIndex];
+        return this.fetchChunkInFragment(fragment, sampleIndex, options);
+      }
       const isobmffReader = demuxer.isobmffReader;
       const sourceSize = await isobmffReader.reader.source._getSize();
       let prevFragment = null;
@@ -5557,7 +5604,7 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
       if (this.internalTrack.fragmentLookupTable) {
         const index = binarySearchLessOrEqual(
           this.internalTrack.fragmentLookupTable,
-          earliestTimestamp,
+          searchTimestamp,
           (x) => x.timestamp
         );
         if (index !== -1) {
@@ -5600,7 +5647,7 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
             const { fragmentIndex: fragmentIndex2, sampleIndex: sampleIndex2, correctSampleFound: correctSampleFound2 } = getBestMatch();
             if (correctSampleFound2) {
               const fragment2 = this.internalTrack.fragments[fragmentIndex2];
-              return this.fetchChunkInFragment(fragment2, sampleIndex2);
+              return this.fetchChunkInFragment(fragment2, sampleIndex2, options);
             }
             if (fragmentIndex2 !== -1) {
               bestFragmentIndex = fragmentIndex2;
@@ -5616,7 +5663,7 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
       }
       if (bestFragmentIndex !== -1) {
         const fragment = this.internalTrack.fragments[bestFragmentIndex];
-        return this.fetchChunkInFragment(fragment, bestSampleIndex);
+        return this.fetchChunkInFragment(fragment, bestSampleIndex, options);
       }
       return null;
     } finally {
@@ -5624,6 +5671,42 @@ var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
     }
   }
 };
+var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
+  internalTrack;
+  constructor(internalTrack) {
+    super(internalTrack);
+    this.internalTrack = internalTrack;
+  }
+  async getCodec() {
+    return this.internalTrack.info.codec;
+  }
+  async getWidth() {
+    return this.internalTrack.info.width;
+  }
+  async getHeight() {
+    return this.internalTrack.info.height;
+  }
+  async getRotation() {
+    return this.internalTrack.rotation;
+  }
+  async getDecoderConfig() {
+    return {
+      codec: extractVideoCodecString(this.internalTrack.info.codec, this.internalTrack.info.codecDescription),
+      codedWidth: this.internalTrack.info.width,
+      codedHeight: this.internalTrack.info.height,
+      description: this.internalTrack.info.codecDescription ?? void 0,
+      colorSpace: this.internalTrack.info.colorSpace ?? void 0
+    };
+  }
+  createChunk(data, timestamp, duration, isKeyFrame) {
+    return new EncodedVideoChunk({
+      data,
+      timestamp,
+      duration,
+      type: isKeyFrame ? "key" : "delta"
+    });
+  }
+};
 var IsobmffAudioTrackBacking = class extends IsobmffTrackBacking {
   internalTrack;
   constructor(internalTrack) {
@@ -5647,6 +5730,14 @@ var IsobmffAudioTrackBacking = class extends IsobmffTrackBacking {
       description: this.internalTrack.info.codecDescription ?? void 0
     };
   }
+  createChunk(data, timestamp, duration, isKeyFrame) {
+    return new EncodedAudioChunk({
+      data,
+      timestamp,
+      duration,
+      type: isKeyFrame ? "key" : "delta"
+    });
+  }
 };
 var getSampleIndexForTimestamp = (sampleTable, timescaleUnits) => {
   const index = binarySearchLessOrEqual(
@@ -5808,9 +5899,9 @@ var Input = class {
     assert(this._format);
     return this._format;
   }
-  async getDuration() {
+  async computeDuration() {
     const demuxer = await this._getDemuxer();
-    return demuxer.getDuration();
+    return demuxer.computeDuration();
   }
   async getTracks() {
     const demuxer = await this._getDemuxer();
@@ -5839,25 +5930,7 @@ var Input = class {
 };
 
 // src/media-drain.ts
-var EncodedVideoChunkDrain = class {
-  constructor(videoTrack) {
-    this.videoTrack = videoTrack;
-  }
-  getFirstChunk() {
-    return this.videoTrack._backing.getFirstChunk();
-  }
-  getChunk(timestamp) {
-    return this.videoTrack._backing.getChunk(timestamp);
-  }
-  getNextChunk(chunk) {
-    return this.videoTrack._backing.getNextChunk(chunk);
-  }
-  getKeyChunk(timestamp) {
-    return this.videoTrack._backing.getKeyChunk(timestamp);
-  }
-  getNextKeyChunk(chunk) {
-    return this.videoTrack._backing.getNextKeyChunk(chunk);
-  }
+var BaseChunkDrain = class {
   async *chunks(startChunk, endTimestamp = Infinity) {
     const chunkQueue = [];
     let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
@@ -5906,26 +5979,12 @@ var EncodedVideoChunkDrain = class {
     }
   }
 };
-var VideoFrameDrain = class {
-  constructor(videoTrack) {
-    this.videoTrack = videoTrack;
-  }
-  decoderConfig = null;
-  async createDecoder(onFrame) {
-    if (!this.decoderConfig) {
-      this.decoderConfig = await this.videoTrack.getDecoderConfig();
-    }
-    const decoder = new VideoDecoder({
-      output: onFrame,
-      error: (error) => console.error(error)
-    });
-    decoder.configure(this.decoderConfig);
-    return decoder;
-  }
-  async getKeyFrame(timestamp) {
+var BaseMediaFrameDrain = class {
+  async getKeyMediaFrame(timestamp) {
     let result = null;
     const decoder = await this.createDecoder((frame) => result = frame);
-    const chunk = await this.videoTrack._backing.getKeyChunk(timestamp);
+    const chunkDrain = this.createChunkDrain();
+    const chunk = await chunkDrain.getKeyChunk(timestamp);
     if (!chunk) {
       return null;
     }
@@ -5934,7 +5993,7 @@ var VideoFrameDrain = class {
     decoder.close();
     return result;
   }
-  async getFrame(timestamp) {
+  async getMediaFrame(timestamp) {
     let result = null;
     const decoder = await this.createDecoder((frame) => {
       if (frame.timestamp / 1e6 <= timestamp) {
@@ -5944,16 +6003,17 @@ var VideoFrameDrain = class {
         frame.close();
       }
     });
-    const keyChunk = await this.videoTrack._backing.getKeyChunk(timestamp);
+    const chunkDrain = this.createChunkDrain();
+    const keyChunk = await chunkDrain.getKeyChunk(timestamp);
     if (!keyChunk) {
       return null;
     }
-    const targetChunk = await this.videoTrack._backing.getChunk(timestamp);
+    const targetChunk = await chunkDrain.getChunk(timestamp);
     assert(targetChunk);
     decoder.decode(keyChunk);
     let currentChunk = keyChunk;
     while (currentChunk !== targetChunk) {
-      const nextChunk = await this.videoTrack._backing.getNextChunk(currentChunk);
+      const nextChunk = await chunkDrain.getNextChunk(currentChunk);
       assert(nextChunk);
       currentChunk = nextChunk;
       decoder.decode(nextChunk);
@@ -5965,7 +6025,7 @@ var VideoFrameDrain = class {
     decoder.close();
     return result;
   }
-  async *frames(startTimestamp = 0, endTimestamp = Infinity) {
+  async *mediaFrames(startTimestamp = 0, endTimestamp = Infinity) {
     const frameQueue = [];
     let firstFrameQueued = false;
     let lastFrame = null;
@@ -5998,7 +6058,8 @@ var VideoFrameDrain = class {
         ({ promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers());
       }
     });
-    const keyChunk = await this.videoTrack._backing.getKeyChunk(startTimestamp) ?? await this.videoTrack._backing.getFirstChunk();
+    const chunkDrain = this.createChunkDrain();
+    const keyChunk = await chunkDrain.getKeyChunk(startTimestamp) ?? await chunkDrain.getFirstChunk();
     if (!keyChunk) {
       return;
     }
@@ -6007,13 +6068,12 @@ var VideoFrameDrain = class {
       let currentChunk = keyChunk;
       let chunksEndTimestamp = Infinity;
       if (endTimestamp < Infinity) {
-        const endFrame = await this.videoTrack._backing.getChunk(endTimestamp);
-        const endKeyFrame = !endFrame ? null : endFrame.type === "key" && endFrame.timestamp / 1e6 === endTimestamp ? endFrame : await this.videoTrack._backing.getNextKeyChunk(endFrame);
+        const endFrame = await chunkDrain.getChunk(endTimestamp);
+        const endKeyFrame = !endFrame ? null : endFrame.type === "key" && endFrame.timestamp / 1e6 === endTimestamp ? endFrame : await chunkDrain.getNextKeyChunk(endFrame);
         if (endKeyFrame) {
           chunksEndTimestamp = endKeyFrame.timestamp / 1e6;
         }
       }
-      const chunkDrain = new EncodedVideoChunkDrain(this.videoTrack);
       const chunks = chunkDrain.chunks(keyChunk, chunksEndTimestamp);
       await chunks.next();
       while (currentChunk && !ended) {
@@ -6051,16 +6111,158 @@ var VideoFrameDrain = class {
     }
   }
 };
+var EncodedVideoChunkDrain = class extends BaseChunkDrain {
+  constructor(videoTrack) {
+    super();
+    this.videoTrack = videoTrack;
+  }
+  getFirstChunk(options = {}) {
+    return this.videoTrack._backing.getFirstChunk(options);
+  }
+  getChunk(timestamp, options = {}) {
+    return this.videoTrack._backing.getChunk(timestamp, options);
+  }
+  getNextChunk(chunk, options = {}) {
+    return this.videoTrack._backing.getNextChunk(chunk, options);
+  }
+  getKeyChunk(timestamp, options = {}) {
+    return this.videoTrack._backing.getKeyChunk(timestamp, options);
+  }
+  getNextKeyChunk(chunk, options = {}) {
+    return this.videoTrack._backing.getNextKeyChunk(chunk, options);
+  }
+};
+var VideoFrameDrain = class extends BaseMediaFrameDrain {
+  constructor(videoTrack) {
+    super();
+    this.videoTrack = videoTrack;
+  }
+  decoderConfig = null;
+  async createDecoder(onFrame) {
+    if (!this.decoderConfig) {
+      this.decoderConfig = await this.videoTrack.getDecoderConfig();
+    }
+    const decoder = new VideoDecoder({
+      output: onFrame,
+      error: (error) => console.error(error)
+    });
+    decoder.configure(this.decoderConfig);
+    return decoder;
+  }
+  createChunkDrain() {
+    return new EncodedVideoChunkDrain(this.videoTrack);
+  }
+  getKeyFrame(timestamp) {
+    return this.getKeyMediaFrame(timestamp);
+  }
+  getFrame(timestamp) {
+    return this.getMediaFrame(timestamp);
+  }
+  frames(startTimestamp = 0, endTimestamp = Infinity) {
+    return this.mediaFrames(startTimestamp, endTimestamp);
+  }
+};
+var EncodedAudioChunkDrain = class extends BaseChunkDrain {
+  constructor(audioTrack) {
+    super();
+    this.audioTrack = audioTrack;
+  }
+  getFirstChunk(options = {}) {
+    return this.audioTrack._backing.getFirstChunk(options);
+  }
+  getChunk(timestamp, options = {}) {
+    return this.audioTrack._backing.getChunk(timestamp, options);
+  }
+  getNextChunk(chunk, options = {}) {
+    return this.audioTrack._backing.getNextChunk(chunk, options);
+  }
+  getKeyChunk(timestamp, options = {}) {
+    return this.audioTrack._backing.getKeyChunk(timestamp, options);
+  }
+  getNextKeyChunk(chunk, options = {}) {
+    return this.audioTrack._backing.getNextKeyChunk(chunk, options);
+  }
+};
+var AudioDataDrain = class extends BaseMediaFrameDrain {
+  constructor(audioTrack) {
+    super();
+    this.audioTrack = audioTrack;
+  }
+  decoderConfig = null;
+  async createDecoder(onData) {
+    if (!this.decoderConfig) {
+      this.decoderConfig = await this.audioTrack.getDecoderConfig();
+    }
+    const decoder = new AudioDecoder({
+      output: onData,
+      error: (error) => console.error(error)
+    });
+    decoder.configure(this.decoderConfig);
+    return decoder;
+  }
+  createChunkDrain() {
+    return new EncodedAudioChunkDrain(this.audioTrack);
+  }
+  getKeyData(timestamp) {
+    return this.getKeyMediaFrame(timestamp);
+  }
+  getData(timestamp) {
+    return this.getMediaFrame(timestamp);
+  }
+  data(startTimestamp = 0, endTimestamp = Infinity) {
+    return this.mediaFrames(startTimestamp, endTimestamp);
+  }
+};
+var AudioBufferDrain = class {
+  constructor(audioTrack) {
+    this.audioTrack = audioTrack;
+    this.audioDataDrain = new AudioDataDrain(audioTrack);
+  }
+  audioDataDrain;
+  audioDataToWrappedArrayBuffer(data) {
+    if (!data) {
+      return null;
+    }
+    const audioBuffer = new AudioBuffer({
+      numberOfChannels: data.numberOfChannels,
+      length: data.numberOfFrames,
+      sampleRate: data.sampleRate
+    });
+    for (let i = 0; i < data.numberOfChannels; i++) {
+      const dataBytes = new Float32Array(data.allocationSize({ planeIndex: i }));
+      data.copyTo(dataBytes, { planeIndex: i });
+      audioBuffer.copyToChannel(dataBytes, i);
+    }
+    return {
+      buffer: audioBuffer,
+      timestamp: data.timestamp / 1e6
+    };
+  }
+  async getBuffer(timestamp) {
+    const data = await this.audioDataDrain.getData(timestamp);
+    return this.audioDataToWrappedArrayBuffer(data);
+  }
+  async *buffers(startTimestamp = 0, endTimestamp = Infinity) {
+    for await (const data of this.audioDataDrain.data(startTimestamp, endTimestamp)) {
+      const result = this.audioDataToWrappedArrayBuffer(data);
+      data.close();
+      yield result;
+    }
+  }
+};
 export {
   ALL_FORMATS,
   AUDIO_CODECS,
   ArrayBufferSource,
   ArrayBufferTarget,
+  AudioBufferDrain,
   AudioBufferSource,
+  AudioDataDrain,
   AudioDataSource,
   AudioSource,
   BlobSource,
   CanvasSource,
+  EncodedAudioChunkDrain,
   EncodedAudioChunkSource,
   EncodedVideoChunkDrain,
   EncodedVideoChunkSource,
diff --git a/package.json b/package.json
index eb5abb6..542011f 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,8 @@
     "build": "node build.mjs && tsc && api-extractor run && node append-namespace.mjs",
     "build-local": "node build.mjs && tsc && api-extractor run --local --verbose && node append-namespace.mjs",
     "watch": "node build.mjs --watch",
-    "lint": "eslint ."
+    "lint": "eslint .",
+    "check": "tsc --noEmit"
   },
   "author": "",
   "license": "MIT",
diff --git a/src/codec.ts b/src/codec.ts
index a39a786..cb1528a 100644
--- a/src/codec.ts
+++ b/src/codec.ts
@@ -5,6 +5,7 @@ import {
 	bytesToHexString,
 	isAllowSharedBufferSource,
 	last,
+	readBits,
 	reverseBitsU32,
 } from './misc';
 import { SubtitleMetadata } from './subtitles';
@@ -268,13 +269,8 @@ export const buildAudioCodecString = (codec: AudioCodec, numberOfChannels: numbe
 
 export const extractAudioCodecString = (codec: AudioCodec, description: Uint8Array | null) => {
 	if (codec === 'aac') {
-		if (!description || description.byteLength < 2) {
-			throw new TypeError('AAC description must be at least 2 bytes long.');
-		}
-
-		// TODO: Is this correct? Give a source/reason
-		const mpeg4AudioObjectType = description[0]! >> 3;
-		return `mp4a.40.${mpeg4AudioObjectType}`;
+		const audioSpecificConfig = parseAacAudioSpecificConfig(description);
+		return `mp4a.40.${audioSpecificConfig.objectType}`;
 	} else if (codec === 'opus') {
 		return 'opus';
 	} else if (codec === 'vorbis') {
@@ -285,6 +281,63 @@ export const extractAudioCodecString = (codec: AudioCodec, description: Uint8Arr
 	throw new TypeError(`Unhandled codec '${codec}'.`);
 };
 
+export const parseAacAudioSpecificConfig = (bytes: Uint8Array | null) => {
+	if (!bytes || bytes.byteLength < 2) {
+		throw new TypeError('AAC description must be at least 2 bytes long.');
+	}
+
+	let bitOffset = 0;
+
+	// 1) Audio Object Type (5 bits)
+	let objectType = readBits(bytes, bitOffset, bitOffset + 5);
+	bitOffset += 5;
+	if (objectType === 31) {
+		// (Escape value) -> 6 bits + 32
+		objectType = 32 + readBits(bytes, bitOffset, bitOffset + 6);
+		bitOffset += 6;
+	}
+
+	// 2) Sampling Frequency Index (4 bits)
+	const frequencyIndex = readBits(bytes, bitOffset, bitOffset + 4);
+	bitOffset += 4;
+	let sampleRate: number | null = null;
+	if (frequencyIndex === 15) {
+		// Explicit sample rate (24 bits)
+		sampleRate = readBits(bytes, bitOffset, bitOffset + 24);
+		bitOffset += 24;
+	} else {
+		const freqTable = [
+			96000, 88200, 64000, 48000, 44100,
+			32000, 24000, 22050, 16000, 12000,
+			11025, 8000, 7350,
+		];
+		if (frequencyIndex < freqTable.length) {
+			sampleRate = freqTable[frequencyIndex]!;
+		}
+	}
+
+	// 3) Channel Configuration (4 bits)
+	const channelConfiguration = readBits(bytes, bitOffset, bitOffset + 4);
+	bitOffset += 4;
+	let numberOfChannels: number | null = null;
+	if (channelConfiguration >= 1 && channelConfiguration <= 7) {
+		const channelMap = {
+			1: 1, 2: 2, 3: 3,
+			4: 4, 5: 5, 6: 6,
+			7: 8,
+		};
+		numberOfChannels = channelMap[channelConfiguration as keyof typeof channelMap];
+	}
+
+	return {
+		objectType,
+		frequencyIndex,
+		sampleRate,
+		channelConfiguration,
+		numberOfChannels,
+	};
+};
+
 export const getVideoEncoderConfigExtension = (codec: VideoCodec) => {
 	if (codec === 'avc') {
 		return {
diff --git a/src/demuxer.ts b/src/demuxer.ts
index 7d66b09..dfba130 100644
--- a/src/demuxer.ts
+++ b/src/demuxer.ts
@@ -8,7 +8,7 @@ export abstract class Demuxer {
 		this.input = input;
 	}
 
-	abstract getDuration(): Promise<number>;
+	abstract computeDuration(): Promise<number>;
 	abstract getTracks(): Promise<InputTrack[]>;
 	abstract getMimeType(): Promise<string>;
 }
diff --git a/src/index.ts b/src/index.ts
index 5d3e7b5..bf59d2d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -38,6 +38,12 @@ export { TransformationMatrix } from './misc';
 export { Source, ArrayBufferSource, BlobSource } from './source';
 export { ALL_FORMATS, ISOBMFF, MP4, MOV, MATROSKA, MKV, WEBM } from './input-format';
 export { Input, InputOptions } from './input';
-export { EncodedVideoChunkDrain, VideoFrameDrain } from './media-drain';
+export {
+	EncodedVideoChunkDrain,
+	VideoFrameDrain,
+	EncodedAudioChunkDrain,
+	AudioDataDrain,
+	AudioBufferDrain,
+} from './media-drain';
 
 // 🐡🦔
diff --git a/src/input-track.ts b/src/input-track.ts
index aa1ad0a..84799c6 100644
--- a/src/input-track.ts
+++ b/src/input-track.ts
@@ -3,7 +3,7 @@ import { Rotation } from './misc';
 
 export interface InputTrackBacking {
 	getCodec(): Promise<MediaCodec>;
-	getDuration(): Promise<number>;
+	computeDuration(): Promise<number>;
 }
 
 export abstract class InputTrack {
@@ -26,22 +26,26 @@ export abstract class InputTrack {
 		return this instanceof InputAudioTrack;
 	}
 
-	getDuration() {
-		return this._backing.getDuration();
+	computeDuration() {
+		return this._backing.computeDuration();
 	}
 }
 
+export type ChunkRetrievalOptions = {
+	metadataOnly?: boolean;
+};
+
 export interface InputVideoTrackBacking extends InputTrackBacking {
 	getCodec(): Promise<VideoCodec>;
 	getWidth(): Promise<number>;
 	getHeight(): Promise<number>;
 	getRotation(): Promise<Rotation>;
 	getDecoderConfig(): Promise<VideoDecoderConfig>;
-	getFirstChunk(): Promise<EncodedVideoChunk | null>;
-	getChunk(timestamp: number): Promise<EncodedVideoChunk | null>;
-	getNextChunk(chunk: EncodedVideoChunk): Promise<EncodedVideoChunk | null>;
-	getKeyChunk(timestamp: number): Promise<EncodedVideoChunk | null>;
-	getNextKeyChunk(chunk: EncodedVideoChunk): Promise<EncodedVideoChunk | null>;
+	getFirstChunk(options: ChunkRetrievalOptions): Promise<EncodedVideoChunk | null>;
+	getChunk(timestamp: number, options: ChunkRetrievalOptions): Promise<EncodedVideoChunk | null>;
+	getNextChunk(chunk: EncodedVideoChunk, options: ChunkRetrievalOptions): Promise<EncodedVideoChunk | null>;
+	getKeyChunk(timestamp: number, options: ChunkRetrievalOptions): Promise<EncodedVideoChunk | null>;
+	getNextKeyChunk(chunk: EncodedVideoChunk, options: ChunkRetrievalOptions): Promise<EncodedVideoChunk | null>;
 }
 
 export class InputVideoTrack extends InputTrack {
@@ -86,6 +90,11 @@ export interface InputAudioTrackBacking extends InputTrackBacking {
 	getNumberOfChannels(): Promise<number>;
 	getSampleRate(): Promise<number>;
 	getDecoderConfig(): Promise<AudioDecoderConfig>;
+	getFirstChunk(options: ChunkRetrievalOptions): Promise<EncodedAudioChunk | null>;
+	getChunk(timestamp: number, options: ChunkRetrievalOptions): Promise<EncodedAudioChunk | null>;
+	getNextChunk(chunk: EncodedAudioChunk, options: ChunkRetrievalOptions): Promise<EncodedAudioChunk | null>;
+	getKeyChunk(timestamp: number, options: ChunkRetrievalOptions): Promise<EncodedAudioChunk | null>;
+	getNextKeyChunk(chunk: EncodedAudioChunk, options: ChunkRetrievalOptions): Promise<EncodedAudioChunk | null>;
 }
 
 export class InputAudioTrack extends InputTrack {
diff --git a/src/input.ts b/src/input.ts
index 3d48aa9..837ac04 100644
--- a/src/input.ts
+++ b/src/input.ts
@@ -50,9 +50,9 @@ export class Input {
 		return this._format;
 	}
 
-	async getDuration() {
+	async computeDuration() {
 		const demuxer = await this._getDemuxer();
-		return demuxer.getDuration();
+		return demuxer.computeDuration();
 	}
 
 	async getTracks() {
diff --git a/src/isobmff/isobmff-demuxer.ts b/src/isobmff/isobmff-demuxer.ts
index fa6fdc9..17694e0 100644
--- a/src/isobmff/isobmff-demuxer.ts
+++ b/src/isobmff/isobmff-demuxer.ts
@@ -1,7 +1,15 @@
-import { AudioCodec, extractAudioCodecString, extractVideoCodecString, MediaCodec, VideoCodec } from '../codec';
+import {
+	AudioCodec,
+	extractAudioCodecString,
+	extractVideoCodecString,
+	MediaCodec,
+	parseAacAudioSpecificConfig,
+	VideoCodec,
+} from '../codec';
 import { Demuxer } from '../demuxer';
 import { Input } from '../input';
 import {
+	ChunkRetrievalOptions,
 	InputAudioTrack,
 	InputAudioTrackBacking,
 	InputTrack,
@@ -166,14 +174,10 @@ export class IsobmffDemuxer extends Demuxer {
 		this.chunkReader = new IsobmffReader(new Reader(input._source, 64 * 2 ** 20)); // Max 64 MiB of stored chunks
 	}
 
-	override async getDuration() {
-		await this.readMetadata();
-
-		if (this.movieDurationInTimescale === -1) {
-			throw new Error('Could not read movie duration.');
-		}
-
-		return this.movieDurationInTimescale / this.movieTimescale;
+	override async computeDuration() {
+		const tracks = await this.getTracks();
+		const trackDurations = await Promise.all(tracks.map(x => x.computeDuration()));
+		return Math.max(0, ...trackDurations);
 	}
 
 	override async getTracks() {
@@ -447,6 +451,18 @@ export class IsobmffDemuxer extends Demuxer {
 						const audioTrack = track as InternalAudioTrack;
 						track.inputTrack = new InputAudioTrack(new IsobmffAudioTrackBacking(audioTrack));
 						this.tracks.push(track);
+
+						if (track.info.codec === 'aac') {
+							// Some videos have metadata mismatch, so let's try to deduce more accurate values directly
+							// from the AudioSpecificConfig:
+							const audioSpecificConfig = parseAacAudioSpecificConfig(track.info.codecDescription);
+							if (audioSpecificConfig.numberOfChannels !== null) {
+								track.info.numberOfChannels = audioSpecificConfig.numberOfChannels;
+							}
+							if (audioSpecificConfig.sampleRate !== null) {
+								track.info.sampleRate = audioSpecificConfig.sampleRate;
+							}
+						}
 					}
 				}
 
@@ -1287,16 +1303,16 @@ export class IsobmffDemuxer extends Demuxer {
 	}
 }
 
-abstract class IsobmffTrackBacking implements InputTrackBacking {
-	chunkToSampleIndex = new WeakMap<EncodedVideoChunk, number>();
-	sampleIndexToChunk = new Map<number, WeakRef<EncodedVideoChunk>>();
+abstract class IsobmffTrackBacking<Chunk extends EncodedVideoChunk | EncodedAudioChunk> implements InputTrackBacking {
+	chunkToSampleIndex = new WeakMap<Chunk, number>();
+	sampleIndexToChunk = new Map<number, WeakRef<Chunk>>();
 
-	chunkToFragmentLocation = new WeakMap<EncodedVideoChunk, {
+	chunkToFragmentLocation = new WeakMap<Chunk, {
 		fragment: Fragment;
 		sampleIndex: number;
 	}>();
 
-	fragmentLocationToChunk = new Map<string, WeakRef<EncodedVideoChunk>>();
+	fragmentLocationToChunk = new Map<string, WeakRef<Chunk>>();
 
 	constructor(public internalTrack: InternalTrack) {
 
@@ -1306,47 +1322,20 @@ abstract class IsobmffTrackBacking implements InputTrackBacking {
 		throw new Error('Not implemented on base class.');
 	}
 
-	async getDuration() {
-		// TODO: Make this produce a proper result in fragmented files
-		return this.internalTrack.durationInTimescale / this.internalTrack.timescale;
-	}
-}
-
-class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideoTrackBacking {
-	override internalTrack: InternalVideoTrack;
-
-	constructor(internalTrack: InternalVideoTrack) {
-		super(internalTrack);
-		this.internalTrack = internalTrack;
+	async computeDuration() {
+		const lastChunk = await this.getChunk(Infinity, { metadataOnly: true });
+		const timestamp = lastChunk?.timestamp;
+		return timestamp ? timestamp / 1e6 : 0;
 	}
 
-	override async getCodec(): Promise<VideoCodec> {
-		return this.internalTrack.info.codec!;
-	}
+	abstract createChunk(
+		data: Uint8Array,
+		timestamp: number,
+		duration: number,
+		isKeyFrame: boolean,
+	): Chunk;
 
-	async getWidth() {
-		return this.internalTrack.info.width;
-	}
-
-	async getHeight() {
-		return this.internalTrack.info.height;
-	}
-
-	async getRotation() {
-		return this.internalTrack.rotation;
-	}
-
-	async getDecoderConfig(): Promise<VideoDecoderConfig> {
-		return {
-			codec: extractVideoCodecString(this.internalTrack.info.codec!, this.internalTrack.info.codecDescription),
-			codedWidth: this.internalTrack.info.width,
-			codedHeight: this.internalTrack.info.height,
-			description: this.internalTrack.info.codecDescription ?? undefined,
-			colorSpace: this.internalTrack.info.colorSpace ?? undefined,
-		};
-	}
-
-	async getFirstChunk() {
+	async getFirstChunk(options: ChunkRetrievalOptions) {
 		if (this.internalTrack.demuxer.isFragmented) {
 			return this.performFragmentedLookup(
 				() => {
@@ -1359,13 +1348,14 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 				},
 				0,
 				Infinity,
+				options,
 			);
 		}
 
-		return this.fetchChunkForSampleIndex(0);
+		return this.fetchChunkForSampleIndex(0, options);
 	}
 
-	async getChunk(timestamp: number) {
+	async getChunk(timestamp: number, options: ChunkRetrievalOptions) {
 		const timestampInTimescale = timestamp * this.internalTrack.timescale;
 
 		if (this.internalTrack.demuxer.isFragmented) {
@@ -1373,15 +1363,16 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 				() => this.findSampleInFragmentsForTimestamp(timestampInTimescale),
 				timestampInTimescale,
 				timestampInTimescale,
+				options,
 			);
 		} else {
 			const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
 			const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
-			return this.fetchChunkForSampleIndex(sampleIndex);
+			return this.fetchChunkForSampleIndex(sampleIndex, options);
 		}
 	}
 
-	async getNextChunk(chunk: EncodedVideoChunk) {
+	async getNextChunk(chunk: Chunk, options: ChunkRetrievalOptions) {
 		if (this.internalTrack.demuxer.isFragmented) {
 			const locationInFragment = this.chunkToFragmentLocation.get(chunk);
 			if (locationInFragment === undefined) {
@@ -1438,6 +1429,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 				},
 				sample.presentationTimestamp,
 				Infinity,
+				options,
 			);
 		}
 
@@ -1445,10 +1437,10 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 		if (sampleIndex === undefined) {
 			throw new Error('Chunk was not created from this track.');
 		}
-		return this.fetchChunkForSampleIndex(sampleIndex + 1);
+		return this.fetchChunkForSampleIndex(sampleIndex + 1, options);
 	}
 
-	async getKeyChunk(timestamp: number) {
+	async getKeyChunk(timestamp: number, options: ChunkRetrievalOptions) {
 		const timestampInTimescale = timestamp * this.internalTrack.timescale;
 
 		if (this.internalTrack.demuxer.isFragmented) {
@@ -1456,6 +1448,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 				() => this.findKeySampleInFragmentsForTimestamp(timestampInTimescale),
 				timestampInTimescale,
 				timestampInTimescale,
+				options,
 			);
 		}
 
@@ -1464,10 +1457,10 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 		const keyFrameSampleIndex = sampleIndex === -1
 			? -1
 			: getRelevantKeyframeIndexForSample(sampleTable, sampleIndex);
-		return this.fetchChunkForSampleIndex(keyFrameSampleIndex);
+		return this.fetchChunkForSampleIndex(keyFrameSampleIndex, options);
 	}
 
-	async getNextKeyChunk(chunk: EncodedVideoChunk) {
+	async getNextKeyChunk(chunk: Chunk, options: ChunkRetrievalOptions) {
 		if (this.internalTrack.demuxer.isFragmented) {
 			const locationInFragment = this.chunkToFragmentLocation.get(chunk);
 			if (locationInFragment === undefined) {
@@ -1534,6 +1527,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 				},
 				sample.presentationTimestamp,
 				Infinity,
+				options,
 			);
 		}
 
@@ -1543,10 +1537,10 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 		}
 		const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
 		const nextKeyFrameSampleIndex = getNextKeyframeIndexForSample(sampleTable, sampleIndex);
-		return this.fetchChunkForSampleIndex(nextKeyFrameSampleIndex);
+		return this.fetchChunkForSampleIndex(nextKeyFrameSampleIndex, options);
 	}
 
-	private async fetchChunkForSampleIndex(sampleIndex: number) {
+	private async fetchChunkForSampleIndex(sampleIndex: number, options: ChunkRetrievalOptions) {
 		if (sampleIndex === -1) {
 			return null;
 		}
@@ -1562,23 +1556,25 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 			return null;
 		}
 
-		// Load the entire chunk
-		await this.internalTrack.demuxer.chunkReader.reader.loadRange(
-			sampleInfo.chunkOffset,
-			sampleInfo.chunkOffset + sampleInfo.chunkSize,
-		);
+		let data: Uint8Array;
+		if (options.metadataOnly) {
+			data = new Uint8Array(0); // Placeholder buffer
+		} else {
+			// Load the entire chunk
+			await this.internalTrack.demuxer.chunkReader.reader.loadRange(
+				sampleInfo.chunkOffset,
+				sampleInfo.chunkOffset + sampleInfo.chunkSize,
+			);
 
-		const data = this.internalTrack.demuxer.chunkReader.readRange(
-			sampleInfo.sampleOffset,
-			sampleInfo.sampleOffset + sampleInfo.sampleSize,
-		);
+			data = this.internalTrack.demuxer.chunkReader.readRange(
+				sampleInfo.sampleOffset,
+				sampleInfo.sampleOffset + sampleInfo.sampleSize,
+			);
+		}
 
-		const chunk = new EncodedVideoChunk({
-			data,
-			timestamp: (1e6 * sampleInfo.presentationTimestamp) / this.internalTrack.timescale,
-			duration: (1e6 * sampleInfo.duration) / this.internalTrack.timescale,
-			type: sampleInfo.isKeyFrame ? 'key' : 'delta',
-		});
+		const timestamp = (1e6 * sampleInfo.presentationTimestamp) / this.internalTrack.timescale;
+		const duration = (1e6 * sampleInfo.duration) / this.internalTrack.timescale;
+		const chunk = this.createChunk(data, timestamp, duration, sampleInfo.isKeyFrame);
 
 		this.chunkToSampleIndex.set(chunk, sampleIndex);
 		this.sampleIndexToChunk.set(sampleIndex, new WeakRef(chunk));
@@ -1586,7 +1582,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 		return chunk;
 	}
 
-	private async fetchChunkInFragment(fragment: Fragment, sampleIndex: number) {
+	private async fetchChunkInFragment(fragment: Fragment, sampleIndex: number, options: ChunkRetrievalOptions) {
 		if (sampleIndex === -1) {
 			return null;
 		}
@@ -1601,20 +1597,22 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 		const sample = trackData.samples[sampleIndex];
 		assert(sample);
 
-		// Load the entire fragment
-		await this.internalTrack.demuxer.chunkReader.reader.loadRange(fragment.dataStart, fragment.dataEnd);
+		let data: Uint8Array;
+		if (options.metadataOnly) {
+			data = new Uint8Array(0); // Placeholder buffer
+		} else {
+			// Load the entire fragment
+			await this.internalTrack.demuxer.chunkReader.reader.loadRange(fragment.dataStart, fragment.dataEnd);
 
-		const data = this.internalTrack.demuxer.chunkReader.readRange(
-			sample.byteOffset,
-			sample.byteOffset + sample.byteSize,
-		);
+			data = this.internalTrack.demuxer.chunkReader.readRange(
+				sample.byteOffset,
+				sample.byteOffset + sample.byteSize,
+			);
+		}
 
-		const chunk = new EncodedVideoChunk({
-			data,
-			timestamp: (1e6 * sample.presentationTimestamp) / this.internalTrack.timescale,
-			duration: (1e6 * sample.duration) / this.internalTrack.timescale,
-			type: sample.isKeyFrame ? 'key' : 'delta',
-		});
+		const timestamp = (1e6 * sample.presentationTimestamp) / this.internalTrack.timescale;
+		const duration = (1e6 * sample.duration) / this.internalTrack.timescale;
+		const chunk = this.createChunk(data, timestamp, duration, sample.isKeyFrame);
 
 		this.chunkToFragmentLocation.set(chunk, { fragment, sampleIndex });
 		this.fragmentLocationToChunk.set(compositeKey, new WeakRef(chunk));
@@ -1663,11 +1661,11 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 			const trackData = fragment.trackData.get(this.internalTrack.id)!;
 			const index = trackData.presentationTimestamps.findLastIndex((x) => {
 				const sample = trackData.samples[x.sampleIndex]!;
-				return sample.isKeyFrame;
+				return sample.isKeyFrame && x.presentationTimestamp <= timestampInTimescale;
 			});
 
 			if (index === -1) {
-				throw new Error('Not supported: Fragment does not contain key sample.');
+				throw new Error('Not supported: Fragment does not begin with a key sample.');
 			}
 
 			const entry = trackData.presentationTimestamps[index]!;
@@ -1683,22 +1681,23 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 		// This function returns the best-matching sample that is currently loaded. Based on this information, we know
 		// which fragments we need to load to find the actual match.
 		getBestMatch: () => { fragmentIndex: number; sampleIndex: number; correctSampleFound: boolean },
-		// The timestamp for which we know the correct sample will not come before it
-		earliestTimestamp: number,
+		// The timestamp with which we can search the lookup table
+		searchTimestamp: number,
 		// The timestamp for which we know the correct sample will not come after it
 		latestTimestamp: number,
+		options: ChunkRetrievalOptions,
 	) {
-		const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
-		if (correctSampleFound) {
-			// The correct sample already exists, easy path.
-			const fragment = this.internalTrack.fragments[fragmentIndex]!;
-			return this.fetchChunkInFragment(fragment, sampleIndex);
-		}
-
 		const demuxer = this.internalTrack.demuxer;
 		const release = await demuxer.fragmentLookupMutex.acquire(); // The algorithm requires exclusivity
 
 		try {
+			const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
+			if (correctSampleFound) {
+				// The correct sample already exists, easy path.
+				const fragment = this.internalTrack.fragments[fragmentIndex]!;
+				return this.fetchChunkInFragment(fragment, sampleIndex, options);
+			}
+
 			const isobmffReader = demuxer.isobmffReader;
 			const sourceSize = await isobmffReader.reader.source._getSize();
 
@@ -1712,7 +1711,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 				// but can jump right into the correct fragment (or at least nearby).
 				const index = binarySearchLessOrEqual(
 					this.internalTrack.fragmentLookupTable,
-					earliestTimestamp,
+					searchTimestamp,
 					x => x.timestamp,
 				);
 
@@ -1769,7 +1768,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 						const { fragmentIndex, sampleIndex, correctSampleFound } = getBestMatch();
 						if (correctSampleFound) {
 							const fragment = this.internalTrack.fragments[fragmentIndex]!;
-							return this.fetchChunkInFragment(fragment, sampleIndex);
+							return this.fetchChunkInFragment(fragment, sampleIndex, options);
 						}
 						if (fragmentIndex !== -1) {
 							bestFragmentIndex = fragmentIndex;
@@ -1789,7 +1788,7 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 			if (bestFragmentIndex !== -1) {
 				// If we finished looping but didn't find a perfect match, still return the best match we found
 				const fragment = this.internalTrack.fragments[bestFragmentIndex]!;
-				return this.fetchChunkInFragment(fragment, bestSampleIndex);
+				return this.fetchChunkInFragment(fragment, bestSampleIndex, options);
 			}
 
 			return null;
@@ -1799,7 +1798,51 @@ class IsobmffVideoTrackBacking extends IsobmffTrackBacking implements InputVideo
 	}
 }
 
-class IsobmffAudioTrackBacking extends IsobmffTrackBacking implements InputAudioTrackBacking {
+class IsobmffVideoTrackBacking extends IsobmffTrackBacking<EncodedVideoChunk> implements InputVideoTrackBacking {
+	override internalTrack: InternalVideoTrack;
+
+	constructor(internalTrack: InternalVideoTrack) {
+		super(internalTrack);
+		this.internalTrack = internalTrack;
+	}
+
+	override async getCodec(): Promise<VideoCodec> {
+		return this.internalTrack.info.codec!;
+	}
+
+	async getWidth() {
+		return this.internalTrack.info.width;
+	}
+
+	async getHeight() {
+		return this.internalTrack.info.height;
+	}
+
+	async getRotation() {
+		return this.internalTrack.rotation;
+	}
+
+	async getDecoderConfig(): Promise<VideoDecoderConfig> {
+		return {
+			codec: extractVideoCodecString(this.internalTrack.info.codec!, this.internalTrack.info.codecDescription),
+			codedWidth: this.internalTrack.info.width,
+			codedHeight: this.internalTrack.info.height,
+			description: this.internalTrack.info.codecDescription ?? undefined,
+			colorSpace: this.internalTrack.info.colorSpace ?? undefined,
+		};
+	}
+
+	createChunk(data: Uint8Array, timestamp: number, duration: number, isKeyFrame: boolean) {
+		return new EncodedVideoChunk({
+			data,
+			timestamp,
+			duration,
+			type: isKeyFrame ? 'key' : 'delta',
+		});
+	}
+}
+
+class IsobmffAudioTrackBacking extends IsobmffTrackBacking<EncodedAudioChunk> implements InputAudioTrackBacking {
 	override internalTrack: InternalAudioTrack;
 
 	constructor(internalTrack: InternalAudioTrack) {
@@ -1827,6 +1870,15 @@ class IsobmffAudioTrackBacking extends IsobmffTrackBacking implements InputAudio
 			description: this.internalTrack.info.codecDescription ?? undefined,
 		};
 	}
+
+	createChunk(data: Uint8Array, timestamp: number, duration: number, isKeyFrame: boolean) {
+		return new EncodedAudioChunk({
+			data,
+			timestamp,
+			duration,
+			type: isKeyFrame ? 'key' : 'delta',
+		});
+	}
 }
 
 const getSampleIndexForTimestamp = (sampleTable: SampleTable, timescaleUnits: number) => {
diff --git a/src/media-drain.ts b/src/media-drain.ts
index 5477ffd..e5f5546 100644
--- a/src/media-drain.ts
+++ b/src/media-drain.ts
@@ -1,31 +1,15 @@
-import { InputVideoTrack } from './input-track';
+import { ChunkRetrievalOptions, InputAudioTrack, InputVideoTrack } from './input-track';
 import { assert, promiseWithResolvers } from './misc';
 
-export class EncodedVideoChunkDrain {
-	constructor(public videoTrack: InputVideoTrack) {}
+abstract class BaseChunkDrain<Chunk extends EncodedVideoChunk | EncodedAudioChunk> {
+	abstract getFirstChunk(options?: ChunkRetrievalOptions): Promise<Chunk | null>;
+	abstract getChunk(timestamp: number, options?: ChunkRetrievalOptions): Promise<Chunk | null>;
+	abstract getNextChunk(chunk: Chunk, options?: ChunkRetrievalOptions): Promise<Chunk | null>;
+	abstract getKeyChunk(timestamp: number, options?: ChunkRetrievalOptions): Promise<Chunk | null>;
+	abstract getNextKeyChunk(chunk: Chunk, options?: ChunkRetrievalOptions): Promise<Chunk | null>;
 
-	getFirstChunk() {
-		return this.videoTrack._backing.getFirstChunk();
-	}
-
-	getChunk(timestamp: number) {
-		return this.videoTrack._backing.getChunk(timestamp);
-	}
-
-	getNextChunk(chunk: EncodedVideoChunk) {
-		return this.videoTrack._backing.getNextChunk(chunk);
-	}
-
-	getKeyChunk(timestamp: number) {
-		return this.videoTrack._backing.getKeyChunk(timestamp);
-	}
-
-	getNextKeyChunk(chunk: EncodedVideoChunk) {
-		return this.videoTrack._backing.getNextKeyChunk(chunk);
-	}
-
-	async* chunks(startChunk?: EncodedVideoChunk, endTimestamp = Infinity) {
-		const chunkQueue: EncodedVideoChunk[] = [];
+	async* chunks(startChunk?: Chunk, endTimestamp = Infinity) {
+		const chunkQueue: Chunk[] = [];
 
 		let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
 		let { promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers();
@@ -87,30 +71,19 @@ export class EncodedVideoChunkDrain {
 	}
 }
 
-export class VideoFrameDrain {
-	decoderConfig: VideoDecoderConfig | null = null;
+abstract class BaseMediaFrameDrain<
+	Chunk extends EncodedVideoChunk | EncodedAudioChunk,
+	MediaFrame extends VideoFrame | AudioData,
+> {
+	abstract createDecoder(onMedia: (media: MediaFrame) => unknown): Promise<VideoDecoder | AudioDecoder>;
+	abstract createChunkDrain(): BaseChunkDrain<Chunk>;
 
-	constructor(public videoTrack: InputVideoTrack) {}
-
-	async createDecoder(onFrame: (frame: VideoFrame) => unknown) {
-		if (!this.decoderConfig) {
-			this.decoderConfig = await this.videoTrack.getDecoderConfig();
-		}
-
-		const decoder = new VideoDecoder({
-			output: onFrame,
-			error: error => console.error(error),
-		});
-		decoder.configure(this.decoderConfig);
-
-		return decoder;
-	}
-
-	async getKeyFrame(timestamp: number) {
-		let result: VideoFrame | null = null;
+	protected async getKeyMediaFrame(timestamp: number): Promise<MediaFrame | null> {
+		let result: MediaFrame | null = null;
 
 		const decoder = await this.createDecoder(frame => result = frame);
-		const chunk = await this.videoTrack._backing.getKeyChunk(timestamp);
+		const chunkDrain = this.createChunkDrain();
+		const chunk = await chunkDrain.getKeyChunk(timestamp);
 		if (!chunk) {
 			return null;
 		}
@@ -123,8 +96,8 @@ export class VideoFrameDrain {
 		return result;
 	}
 
-	async getFrame(timestamp: number) {
-		let result: VideoFrame | null = null;
+	protected async getMediaFrame(timestamp: number): Promise<MediaFrame | null> {
+		let result: MediaFrame | null = null;
 
 		const decoder = await this.createDecoder((frame) => {
 			if (frame.timestamp / 1e6 <= timestamp) {
@@ -134,19 +107,20 @@ export class VideoFrameDrain {
 				frame.close();
 			}
 		});
-		const keyChunk = await this.videoTrack._backing.getKeyChunk(timestamp);
+		const chunkDrain = this.createChunkDrain();
+		const keyChunk = await chunkDrain.getKeyChunk(timestamp);
 		if (!keyChunk) {
 			return null;
 		}
 
-		const targetChunk = await this.videoTrack._backing.getChunk(timestamp);
+		const targetChunk = await chunkDrain.getChunk(timestamp);
 		assert(targetChunk);
 
 		decoder.decode(keyChunk);
 
 		let currentChunk = keyChunk;
 		while (currentChunk !== targetChunk) {
-			const nextChunk = await this.videoTrack._backing.getNextChunk(currentChunk);
+			const nextChunk = await chunkDrain.getNextChunk(currentChunk);
 			assert(nextChunk);
 
 			currentChunk = nextChunk;
@@ -163,10 +137,10 @@ export class VideoFrameDrain {
 		return result;
 	}
 
-	async* frames(startTimestamp = 0, endTimestamp = Infinity) {
-		const frameQueue: VideoFrame[] = [];
+	protected async* mediaFrames(startTimestamp = 0, endTimestamp = Infinity) {
+		const frameQueue: MediaFrame[] = [];
 		let firstFrameQueued = false;
-		let lastFrame: VideoFrame | null = null;
+		let lastFrame: MediaFrame | null = null;
 		let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
 		let ended = false;
 
@@ -184,10 +158,10 @@ export class VideoFrameDrain {
 
 			if (lastFrame) {
 				if (frameTimestamp > startTimestamp) {
-					// We don't know ahead of time what the first frame is. This is because the first frame is the last
-					// frame whose timestamp is less than or equal to the start timestamp. Therefore we need to wait
-					// for the first frame after the start timestamp, and then we'll know that the previous frame was
-					// the first frame.
+					// We don't know ahead of time what the first first is. This is because the first first is the last
+					// first whose timestamp is less than or equal to the start timestamp. Therefore we need to wait
+					// for the first first after the start timestamp, and then we'll know that the previous first was
+					// the first first.
 					frameQueue.push(lastFrame);
 					firstFrameQueued = true;
 				} else {
@@ -208,8 +182,8 @@ export class VideoFrameDrain {
 			}
 		});
 
-		const keyChunk = await this.videoTrack._backing.getKeyChunk(startTimestamp)
-			?? await this.videoTrack._backing.getFirstChunk();
+		const chunkDrain = this.createChunkDrain();
+		const keyChunk = await chunkDrain.getKeyChunk(startTimestamp) ?? await chunkDrain.getFirstChunk();
 		if (!keyChunk) {
 			return;
 		}
@@ -218,7 +192,7 @@ export class VideoFrameDrain {
 
 		// The following is the "pump" process that keeps pumping chunks into the decoder
 		void (async () => {
-			let currentChunk: EncodedVideoChunk | null = keyChunk;
+			let currentChunk: Chunk | null = keyChunk;
 
 			let chunksEndTimestamp = Infinity;
 			if (endTimestamp < Infinity) {
@@ -226,23 +200,25 @@ export class VideoFrameDrain {
 				// frames (B-frames). Instead, we'll need to keep decoding chunks until we get a frame that exceeds
 				// this end time. However, we can still put a bound on it: Since key frames are by definition never
 				// out of order, we can stop at the first key frame after the end timestamp.
-				const endFrame = await this.videoTrack._backing.getChunk(endTimestamp);
+				const endFrame = await chunkDrain.getChunk(endTimestamp);
 				const endKeyFrame = !endFrame
 					? null
 					: endFrame.type === 'key' && endFrame.timestamp / 1e6 === endTimestamp
 						? endFrame
-						: await this.videoTrack._backing.getNextKeyChunk(endFrame);
+						: await chunkDrain.getNextKeyChunk(endFrame);
 
 				if (endKeyFrame) {
 					chunksEndTimestamp = endKeyFrame.timestamp / 1e6;
 				}
 			}
 
-			const chunkDrain = new EncodedVideoChunkDrain(this.videoTrack);
 			const chunks = chunkDrain.chunks(keyChunk, chunksEndTimestamp);
 			await chunks.next();
 
 			while (currentChunk && !ended) {
+				// TODO: Some sort of queue size limit for the frames? Right now this code relies on the pace at which
+				// the consumer calls .close()
+
 				decoder.decode(currentChunk);
 
 				if (decoder.decodeQueueSize >= 10) {
@@ -285,3 +261,181 @@ export class VideoFrameDrain {
 		}
 	}
 }
+
+export class EncodedVideoChunkDrain extends BaseChunkDrain<EncodedVideoChunk> {
+	constructor(public videoTrack: InputVideoTrack) {
+		super();
+	}
+
+	getFirstChunk(options: ChunkRetrievalOptions = {}) {
+		return this.videoTrack._backing.getFirstChunk(options);
+	}
+
+	getChunk(timestamp: number, options: ChunkRetrievalOptions = {}) {
+		return this.videoTrack._backing.getChunk(timestamp, options);
+	}
+
+	getNextChunk(chunk: EncodedVideoChunk, options: ChunkRetrievalOptions = {}) {
+		return this.videoTrack._backing.getNextChunk(chunk, options);
+	}
+
+	getKeyChunk(timestamp: number, options: ChunkRetrievalOptions = {}) {
+		return this.videoTrack._backing.getKeyChunk(timestamp, options);
+	}
+
+	getNextKeyChunk(chunk: EncodedVideoChunk, options: ChunkRetrievalOptions = {}) {
+		return this.videoTrack._backing.getNextKeyChunk(chunk, options);
+	}
+}
+
+export class VideoFrameDrain extends BaseMediaFrameDrain<EncodedVideoChunk, VideoFrame> {
+	decoderConfig: VideoDecoderConfig | null = null;
+
+	constructor(public videoTrack: InputVideoTrack) {
+		super();
+	}
+
+	async createDecoder(onFrame: (frame: VideoFrame) => unknown) {
+		if (!this.decoderConfig) {
+			this.decoderConfig = await this.videoTrack.getDecoderConfig();
+		}
+
+		const decoder = new VideoDecoder({
+			output: onFrame,
+			error: error => console.error(error),
+		});
+		decoder.configure(this.decoderConfig);
+
+		return decoder;
+	}
+
+	createChunkDrain() {
+		return new EncodedVideoChunkDrain(this.videoTrack);
+	}
+
+	getKeyFrame(timestamp: number) {
+		return this.getKeyMediaFrame(timestamp);
+	}
+
+	getFrame(timestamp: number) {
+		return this.getMediaFrame(timestamp);
+	}
+
+	frames(startTimestamp = 0, endTimestamp = Infinity) {
+		return this.mediaFrames(startTimestamp, endTimestamp);
+	}
+}
+
+export class EncodedAudioChunkDrain extends BaseChunkDrain<EncodedAudioChunk> {
+	constructor(public audioTrack: InputAudioTrack) {
+		super();
+	}
+
+	getFirstChunk(options: ChunkRetrievalOptions = {}) {
+		return this.audioTrack._backing.getFirstChunk(options);
+	}
+
+	getChunk(timestamp: number, options: ChunkRetrievalOptions = {}) {
+		return this.audioTrack._backing.getChunk(timestamp, options);
+	}
+
+	getNextChunk(chunk: EncodedAudioChunk, options: ChunkRetrievalOptions = {}) {
+		return this.audioTrack._backing.getNextChunk(chunk, options);
+	}
+
+	getKeyChunk(timestamp: number, options: ChunkRetrievalOptions = {}) {
+		return this.audioTrack._backing.getKeyChunk(timestamp, options);
+	}
+
+	getNextKeyChunk(chunk: EncodedAudioChunk, options: ChunkRetrievalOptions = {}) {
+		return this.audioTrack._backing.getNextKeyChunk(chunk, options);
+	}
+}
+
+export class AudioDataDrain extends BaseMediaFrameDrain<EncodedAudioChunk, AudioData> {
+	decoderConfig: AudioDecoderConfig | null = null;
+
+	constructor(public audioTrack: InputAudioTrack) {
+		super();
+	}
+
+	async createDecoder(onData: (data: AudioData) => unknown) {
+		if (!this.decoderConfig) {
+			this.decoderConfig = await this.audioTrack.getDecoderConfig();
+		}
+
+		const decoder = new AudioDecoder({
+			output: onData,
+			error: error => console.error(error),
+		});
+		decoder.configure(this.decoderConfig);
+
+		return decoder;
+	}
+
+	createChunkDrain() {
+		return new EncodedAudioChunkDrain(this.audioTrack);
+	}
+
+	getKeyData(timestamp: number) {
+		return this.getKeyMediaFrame(timestamp);
+	}
+
+	getData(timestamp: number) {
+		return this.getMediaFrame(timestamp);
+	}
+
+	data(startTimestamp = 0, endTimestamp = Infinity) {
+		return this.mediaFrames(startTimestamp, endTimestamp);
+	}
+}
+
+type WrappedAudioBuffer = {
+	buffer: AudioBuffer;
+	timestamp: number;
+};
+
+export class AudioBufferDrain {
+	audioDataDrain: AudioDataDrain;
+
+	constructor(public audioTrack: InputAudioTrack) {
+		this.audioDataDrain = new AudioDataDrain(audioTrack);
+	}
+
+	private audioDataToWrappedArrayBuffer(data: AudioData | null): WrappedAudioBuffer | null {
+		if (!data) {
+			return null;
+		}
+
+		const audioBuffer = new AudioBuffer({
+			numberOfChannels: data.numberOfChannels,
+			length: data.numberOfFrames,
+			sampleRate: data.sampleRate,
+		});
+
+		for (let i = 0; i < data.numberOfChannels; i++) {
+			const dataBytes = new Float32Array(data.allocationSize({ planeIndex: i }));
+			data.copyTo(dataBytes, { planeIndex: i });
+			audioBuffer.copyToChannel(dataBytes, i);
+		}
+
+		return {
+			buffer: audioBuffer,
+			timestamp: data.timestamp / 1e6,
+		};
+	}
+
+	async getBuffer(timestamp: number) {
+		const data = await this.audioDataDrain.getData(timestamp);
+		return this.audioDataToWrappedArrayBuffer(data);
+	}
+
+	async* buffers(startTimestamp = 0, endTimestamp = Infinity) {
+		for await (const data of this.audioDataDrain.data(startTimestamp, endTimestamp)) {
+			const result = this.audioDataToWrappedArrayBuffer(data);
+			data.close();
+
+			yield result;
+		}
+	}
+}