diff --git a/dev/player.html b/dev/player.html
index a2c0013..5204a4a 100644
--- a/dev/player.html
+++ b/dev/player.html
@@ -48,33 +48,8 @@ let videoRotation = 0;
 if (!videoTrack) {
 	canvas.style.display = 'none';
 } else {
-	canvas.width = await videoTrack.getWidth();
-	canvas.height = await videoTrack.getHeight();
-
-	videoRotation = await videoTrack.getRotation();
-	if (videoRotation % 180 === 90) {
-		[canvas.width, canvas.height] = [canvas.height, canvas.width];
-	}
-
-	switch (videoRotation) {
-		case 90:
-			// Move to right edge, then rotate
-			context.translate(canvas.width, 0);
-			context.rotate(90 * Math.PI / 180);
-			break;
-	
-		case 180:
-			// Move to bottom-right corner, then rotate
-			context.translate(canvas.width, canvas.height);
-			context.rotate(180 * Math.PI / 180);
-			break;
-	
-		case 270:
-			// Move to bottom edge, then rotate
-			context.translate(0, canvas.height);
-			context.rotate(270 * Math.PI / 180);
-			break;
-	}
+	canvas.width = await videoTrack.getRotatedWidth();
+	canvas.height = await videoTrack.getRotatedHeight();
 }
 
 const totalDuration = await input.computeDuration();
@@ -82,7 +57,7 @@ durationElement.textContent = formatSeconds(totalDuration);
 
 playerDiv.style.display = 'flex';
 
-const videoDrain = videoTrack && new Metamuxer.VideoFrameDrain(videoTrack);
+const videoDrain = videoTrack && new Metamuxer.CanvasDrain(videoTrack);
 const audioDrain = audioTrack && new Metamuxer.AudioBufferDrain(audioTrack);
 
 let startTime = null;
@@ -149,18 +124,15 @@ async function seek() {
 
 	await videoFrameIterator?.return();
 
-	videoFrameIterator = videoDrain.frames(getPlaybackTime());
+	videoFrameIterator = videoDrain.canvases(getPlaybackTime());
 	
 	const newCurrentFrame = (await videoFrameIterator.next()).value;
 	const newNextFrame = (await videoFrameIterator.next()).value;
 
-	currentFrame?.close();
-	nextFrame?.close();
-
 	currentFrame = newCurrentFrame;
 	nextFrame = newNextFrame;
 
-	context.drawImage(currentFrame, 0, 0);
+	context.drawImage(currentFrame.canvas, 0, 0);
 	
 	seeking = false;
 }
@@ -174,18 +146,15 @@ async function render() {
 	}
 
 	if (currentFrame) {
-		while (nextFrame && nextFrame.timestamp / 1e6 <= playbackTime && !seeking) {
-			currentFrame.close();
+		while (nextFrame && nextFrame.timestamp <= playbackTime && !seeking) {
 			currentFrame = nextFrame;
-			context.drawImage(currentFrame, 0, 0);
+			context.drawImage(currentFrame.canvas, 0, 0);
 
 			const currentSeekId = seekId;
 			const newNextFrame = (await videoFrameIterator.next()).value;
 
 			if (currentSeekId === seekId) {
 				nextFrame = newNextFrame;
-			} else {
-				newNextFrame.close();
 			}
 		}
 	}
diff --git a/dist/metamuxer.js b/dist/metamuxer.js
index aff463f..da137dc 100644
--- a/dist/metamuxer.js
+++ b/dist/metamuxer.js
@@ -31,6 +31,7 @@ var Metamuxer = (() => {
     AudioDataSource: () => AudioDataSource,
     AudioSource: () => AudioSource,
     BlobSource: () => BlobSource,
+    CanvasDrain: () => CanvasDrain,
     CanvasSource: () => CanvasSource,
     EncodedAudioChunkDrain: () => EncodedAudioChunkDrain,
     EncodedAudioChunkSource: () => EncodedAudioChunkSource,
@@ -4171,6 +4172,14 @@ ${cue.notes ?? ""}`;
     getRotation() {
       return this._backing.getRotation();
     }
+    async getRotatedWidth() {
+      const rotation = await this._backing.getRotation();
+      return rotation % 180 === 0 ? this._backing.getWidth() : this._backing.getHeight();
+    }
+    async getRotatedHeight() {
+      const rotation = await this._backing.getRotation();
+      return rotation % 180 === 0 ? this._backing.getHeight() : this._backing.getWidth();
+    }
     getDecoderConfig() {
       return this._backing.getDecoderConfig();
     }
@@ -6235,6 +6244,45 @@ ${cue.notes ?? ""}`;
       return this.mediaFrames(startTimestamp, endTimestamp);
     }
   };
+  var CanvasDrain = class {
+    constructor(videoTrack, dimensions) {
+      this.videoTrack = videoTrack;
+      this.dimensions = dimensions;
+      this.videoFrameDrain = new VideoFrameDrain(videoTrack);
+    }
+    videoFrameDrain;
+    async videoFrameToWrappedCanvas(frame) {
+      const width = this.dimensions?.width ?? await this.videoTrack.getRotatedWidth();
+      const height = this.dimensions?.height ?? await this.videoTrack.getRotatedHeight();
+      const rotation = await this.videoTrack.getRotation();
+      const canvas = document.createElement("canvas");
+      canvas.width = width;
+      canvas.height = height;
+      const context = canvas.getContext("2d", { alpha: false });
+      assert(context);
+      context.translate(width / 2, height / 2);
+      context.rotate(rotation * Math.PI / 180);
+      context.translate(-width / 2, -height / 2);
+      const [imageWidth, imageHeight] = rotation % 180 === 0 ? [width, height] : [height, width];
+      context.drawImage(frame, (width - imageWidth) / 2, (height - imageHeight) / 2, imageWidth, imageHeight);
+      const result = {
+        canvas,
+        timestamp: frame.timestamp / 1e6,
+        duration: (frame.duration ?? 0) / 1e6
+      };
+      frame.close();
+      return result;
+    }
+    async getCanvas(timestamp) {
+      const frame = await this.videoFrameDrain.getFrame(timestamp);
+      return frame && this.videoFrameToWrappedCanvas(frame);
+    }
+    async *canvases(startTimestamp = 0, endTimestamp = Infinity) {
+      for await (const frame of this.videoFrameDrain.frames(startTimestamp, endTimestamp)) {
+        yield this.videoFrameToWrappedCanvas(frame);
+      }
+    }
+  };
   var EncodedAudioChunkDrain = class extends BaseChunkDrain {
     constructor(audioTrack) {
       super();
@@ -6291,9 +6339,6 @@ ${cue.notes ?? ""}`;
     }
     audioDataDrain;
     audioDataToWrappedArrayBuffer(data) {
-      if (!data) {
-        return null;
-      }
       const audioBuffer = new AudioBuffer({
         numberOfChannels: data.numberOfChannels,
         length: data.numberOfFrames,
@@ -6305,21 +6350,21 @@ ${cue.notes ?? ""}`;
         audioBuffer.copyToChannel(dataBytes, i);
       }
       const sampleDuration = 1 / data.sampleRate;
-      return {
+      const result = {
         buffer: audioBuffer,
         // Rounding the timestamp based on the sample duration removes audio playback artifacts
         timestamp: Math.round(data.timestamp / 1e6 / sampleDuration) * sampleDuration
       };
+      data.close();
+      return result;
     }
     async getBuffer(timestamp) {
       const data = await this.audioDataDrain.getData(timestamp);
-      return this.audioDataToWrappedArrayBuffer(data);
+      return data && 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;
+        yield this.audioDataToWrappedArrayBuffer(data);
       }
     }
   };
diff --git a/dist/metamuxer.min.js b/dist/metamuxer.min.js
index cc83af6..2dd0b2e 100644
--- a/dist/metamuxer.min.js
+++ b/dist/metamuxer.min.js
@@ -1,10 +1,10 @@
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l=this.auxWriter.getSlice(0,this.auxWriter.getPos()),d=this.createSampleForTrack(e,l,e.lastCueEndTimestamp,n-e.lastCueEndTimestamp,"key");await this.registerSample(e,d),e.lastCueEndTimestamp=n}this.auxWriter.seek(0);for(let u=0;u<e.cueQueue.length;u++){let l=e.cueQueue[u];if(l.timestamp>=a)break;ne.lastIndex=0;let d=ne.test(l.text),p=l.timestamp+l.duration,h=e.cueToSourceId.get(l);if(h===void 0&&a<p&&(h=e.nextSourceId++,e.cueToSourceId.set(l,h)),l.notes){let k=Gt(l.notes);this.auxBoxWriter.writeBox(k)}let b=Xt(l.text,d?n:null,l.identifier??null,l.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 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n=Math.ceil(e/16)*Math.ceil(t/16),a=Zt.find(l=>n<=l.maxMacroblocks&&r<=l.maxBitrate)??A(Zt),c=a?a.level:0,o="64".padStart(2,"0"),u="00",m=c.toString(16).padStart(2,"0");return`avc1.${o}${u}${m}`}else if(i==="hevc"){let s="",a="6",c=e*t,o=Jt.find(m=>c<=m.maxPictureSize&&r<=m.maxBitrate)??A(Jt);return`hev1.${s}1.${a}.${o.tier}${o.level}.B0`}else{if(i==="vp8")return"vp8";if(i==="vp9"){let s="00",n=e*t,a=er.find(o=>n<=o.maxPictureSize&&r<=o.maxBitrate)??A(er);return`vp09.${s}.${a.level}.08`}else if(i==="av1"){let n=e*t,a=tr.find(o=>n<=o.maxPictureSize&&r<=o.maxBitrate)??A(tr);return`av01.0.${a.level.toString().padStart(2,"0")}${a.tier}.08`}}throw new TypeError(`Unhandled codec '${i}'.`)},ir=(i,e)=>{if(i==="avc"){if(!e||e.byteLength<4)throw new TypeError("AVC description must be at least 4 bytes long.");return`avc1.${Ut(e.subarray(1,4))}`}else if(i==="hevc"){if(!e)throw new TypeError("HEVC description must be provided.");let t=new 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c=[96e3,88200,64e3,48e3,44100,32e3,24e3,22050,16e3,12e3,11025,8e3,7350];r<c.length&&(s=c[r])}let n=O(i,e,e+4);e+=4;let a=null;return n>=1&&n<=7&&(a={1:1,2:2,3:3,4:4,5:5,6:6,7:8}[n]),{objectType:t,frequencyIndex:r,sampleRate:s,channelConfiguration:n,numberOfChannels:a}},ar=i=>i==="avc"?{avc:{format:"avc"}}:i==="hevc"?{hevc:{format:"hevc"}}:{},or=i=>i==="aac"?{aac:{format:"aac"}}:i==="opus"?{opus:{format:"opus"}}:{},We=i=>{if(!i)throw new TypeError("Video chunk metadata must be provided.");if(typeof i!="object")throw new TypeError("Video chunk metadata must be an object.");if(!i.decoderConfig)throw new TypeError("Video chunk metadata must include a decoder configuration.");if(typeof i.decoderConfig!="object")throw new TypeError("Video chunk metadata decoder configuration must be an object.");if(typeof i.decoderConfig.codec!="string")throw new TypeError("Video chunk metadata decoder configuration must specify a codec 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he(this.auxWriter);ftypSize=null;mdat=null;trackDatas=[];creationTime=Math.floor(Date.now()/1e3)+vi;finalizedChunks=[];nextFragmentNumber=1;constructor(e,t){super(e),this.writer=e._writer,this.boxWriter=new he(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(Qt({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;We(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;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},timescale:t.decoderConfig.sampleRate,samples:[],sampleQueue:[],timestampProcessingQueue:[],timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,finalizedChunks:[],currentChunk:null,compactlyCodedChunkTable:[]};return 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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=Xt();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),h=m.timestamp+m.duration,p=e.cueToSourceId.get(m);if(p===void 0&&a<h&&(p=e.nextSourceId++,e.cueToSourceId.set(m,p)),m.notes){let g=Yt(m.notes);this.auxBoxWriter.writeBox(g)}let b=Gt(m.text,l?n:null,m.identifier??null,m.settings??null,p??null);this.auxBoxWriter.writeBox(b),h===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=pe(this.trackDatas,this.creationTime,!0);this.boxWriter.writeBox(o)}let r=this.trackDatas.filter(o=>o.currentChunk),s=this.writer.getPos(),n=yt(t,r);this.boxWriter.writeBox(n);{let o=Pe(!1),u=0;for(let l of r)for(let h of l.currentChunk.samples)u+=h.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=yt(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=pe(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=pe(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=qt(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=pe(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 ke=class{value;constructor(e){this.value=e}},ue=class{value;constructor(e){this.value=e}},Te=class{value;constructor(e){this.value=e}};var Rt=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,cr=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,ur="https://github.com/Vanilagy/webm-muxer",mr=6,dr=5,Ri={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},Ke=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=Rt(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=cr(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??Rt(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 ke)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:ur},{id:22337,data:ur},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:Ri[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:j(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},Ee(r)?{id:21936,data:[{id:21937,data:G[r.matrix]},{id:21946,data:X[r.transfer]},{id:21947,data:q[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:j(e.info.decoderConfig.description)}:null,{id:225,data:[{id:181,data:new ke(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:mr,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;We(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;He(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,h=>{let b=Me(h.slice(1,-1))-o;return`<${Ve(b)}>`});let u=M.encode(c),m=`${t.settings??""}
 ${t.identifier??""}
-${t.notes??""}`,d=this.createInternalChunk(u,a,t.duration,"key",l.trim()?M.encode(l):null);n.chunkQueue.push(d),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(O(t.data,0,2)!==2)return;r+=2;let s=(O(t.data,r+1,r+2)<<1)+O(t.data,r+0,r+1);r+=2,s===3&&r++;let n=O(t.data,r+0,r+1);if(r++,n)return;let a=O(t.data,r+0,r+1);if(r++,a!==0)return;r+=2;let c=O(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(l=>{if(l.track.source._closed)return!0;if(e===l)return t.type==="key";let d=l.chunkQueue[0];return d&&d.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 l={id:163,data:[c,t.data]};this.writeEBML(l)}else{let l={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(l)}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:lr,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,lr),this.writer.seek(t);let r=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(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(),m(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 Q=class{},Ke=class extends Q{_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 Q{_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)}},U=class extends te{_connectedTrack=null;_codec;constructor(e){if(super(),!Z.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${Z.join(", ")}.`);this._codec=e}},Qe=class extends U{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},Ai=5,Ri=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!Z.includes(i.codec))throw new TypeError(`Invalid video codec '${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),m(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)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},$e=class extends U{_encoder;constructor(e){super(e.codec),this._encoder=new Ce(this,e)}digest(e){if(!(e instanceof VideoFrame))throw new TypeError("videoFrame must be a VideoFrame.");return this._encoder.digest(e)}_flush(){return this._encoder.flush()}},je=class extends U{_encoder;_canvas;constructor(e,t){if(!(e instanceof HTMLCanvasElement))throw new TypeError("canvas must be an HTMLCanvasElement.");super(t.codec),this._encoder=new Ce(this,t),this._canvas=e}digest(e,t=0){if(!Number.isFinite(e)||e<0)throw new TypeError("timestamp must be a non-negative number.");if(!Number.isFinite(t)||t<0)throw new TypeError("duration must be a non-negative number.");let r=new VideoFrame(this._canvas,{timestamp:Math.round(1e6*e),duration:Math.round(1e6*t),alpha:"discard"}),s=this._encoder.digest(r);return r.close(),s}_flush(){return this._encoder.flush()}},qe=class extends U{_encoder;_abortController=null;_track;_offsetTimestamps=!0;constructor(e,t){if(!(e instanceof MediaStreamTrack)||e.kind!=="video")throw new TypeError("track must be a video MediaStreamTrack.");t={...t,latencyMode:"realtime"},super(t.codec),this._encoder=new Ce(this,t),this._track=e}_start(){this._abortController=new AbortController;let e=new MediaStreamTrackProcessor({track:this._track}),t=new WritableStream({write:r=>{this._encoder.digest(r),r.close()}});e.readable.pipeTo(t,{signal:this._abortController.signal}).catch(r=>{r instanceof DOMException&&r.name==="AbortError"||console.error("Pipe error:",r)})}async _flush(){this._abortController&&(this._abortController.abort(),this._abortController=null),await this._encoder.flush()}},B=class extends te{_connectedTrack=null;_codec;constructor(e){if(super(),!J.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${J.join(", ")}.`);this._codec=e}},Xe=class extends B{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},Oi=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!J.includes(i.codec))throw new TypeError(`Invalid audio codec '${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),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,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)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},Ge=class extends B{_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 B{_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 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 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 H;constructor(e){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(!(e.format instanceof Q))throw new TypeError("options.format must be an OutputFormat.");if(!(e.target instanceof K))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 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 le=class{_sizePromise=null;_getSize(){return this._sizePromise??=this._retrieveSize()}},tt=class extends le{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 le{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 me=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 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 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=A(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)}m(n),this.totalStoredBytes-=n.bytes.byteLength,this.loadedSegments.splice(a,1)}}getViewAndOffset(e,t){let r=A(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=A(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=[L(0),L(90),L(180),L(270)],st=class extends me{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new H;chunkReader;constructor(e){super(e),this.isobmffReader=new ie(e._mainReader),this.chunkReader=new ie(new de(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();m(t.name==="moof"),await this.isobmffReader.reader.loadRange(e,e+t.totalSize),this.isobmffReader.pos=e,this.traverseBox();let r=N(this.fragments,e,n=>n.moofOffset);m(r!==-1);let s=this.fragments[r];m(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(d=>d.id===n);this.isobmffReader.pos=0;let o=null,u=null,l=A(c.fragments,e-1,d=>d.moofOffset);for(l!==-1&&(o=c.fragments[l],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 d=this.isobmffReader.pos,p=this.isobmffReader.readBoxHeader();if(p.name==="moof"){let h=N(this.fragments,d,b=>b.moofOffset);if(h===-1){this.isobmffReader.pos=d;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=d+p.totalSize}o&&o.trackData.has(n)&&(u=o)}if(u){let d=u.trackData.get(n);m(d.startTimestampIsFinal),dr(a,d.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;m(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(l=>l.every((d,p)=>d===o[p]));u===-1?s.rotation=0:s.rotation=90*u}break;case"mdhd":{let s=this.currentTrack;m(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;m(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;m(s),s.sampleTableOffset=e,this.readContiguousBoxes(t.contentSize)}break;case"stsd":{let s=this.currentTrack;if(m(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 l=this.isobmffReader.readU16();this.isobmffReader.pos+=6;let d=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,d=this.isobmffReader.readF64(),l=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=l,s.info.sampleRate=d,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}}}break;case"avcC":{let s=this.currentTrack;m(s&&s.info),s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"hvcC":{let s=this.currentTrack;m(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(m(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;m(s&&s.info),this.isobmffReader.pos+=4;let n=this.isobmffReader.readU8();m(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 l=this.isobmffReader.readU8();m(l===4),this.isobmffReader.readIsomVariableInteger();let d=this.isobmffReader.readU8();m(d===64),this.isobmffReader.pos+=12;let p=this.isobmffReader.readU8();m(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(m(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(),l=this.isobmffReader.readU32();s.sampleTable.sampleTimingEntries.push({startIndex:a,startDecodeTimestamp:c,count:u,delta:l}),a+=u,c+=u*l}}break;case"ctts":{let s=this.currentTrack;if(m(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(m(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(m(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(m(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(),l=this.isobmffReader.readU32();s.sampleTable.sampleToChunk.push({startSampleIndex:-1,startChunkIndex:o,samplesPerChunk:u,sampleDescriptionIndex:l})}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(m(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(m(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,l=c&3,d=this.isobmffReader,p=[d.readU8.bind(d),d.readU16.bind(d),d.readU24.bind(d),d.readU32.bind(d)],h=p[o],b=p[u],k=p[l],g=this.isobmffReader.readU32();for(let w=0;w<g;w++){let y=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),v=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),P=h(),E=b(),F=k();a.fragmentLookupTable.push({timestamp:y,moofOffset:v})}}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=A(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=R(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(m(this.currentFragment),this.readContiguousBoxes(t.contentSize),this.currentTrack){let s=this.currentFragment.trackData.get(this.currentTrack.id);if(s){let n=A(this.currentTrack.fragments,this.currentFragment.moofOffset,c=>c.moofOffset);this.currentTrack.fragments.splice(n+1,0,this.currentFragment);let{currentFragmentState:a}=this.currentTrack;m(a),a.startTimestamp!==null&&(dr(s,a.startTimestamp),s.startTimestampIsFinal=!0)}this.currentTrack.currentFragmentState=null,this.currentTrack=null}break;case"tfhd":{m(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),l=!!(s&65536),d=!!(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():d&&(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()),l&&(h.currentFragmentState.defaultSampleDuration=0)}break;case"tfdt":{let s=this.currentTrack;if(!s)break;m(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(m(this.currentFragment),m(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),l=!!(a&512),d=!!(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,y={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(s.id,y);for(let E=0;E<h;E++){let F;u?F=this.isobmffReader.readU32():(m(s.currentFragmentState.defaultSampleDuration!==null),F=s.currentFragmentState.defaultSampleDuration);let se;l?se=this.isobmffReader.readU32():(m(s.currentFragmentState.defaultSampleSize!==null),se=s.currentFragmentState.defaultSampleSize);let Oe;d?Oe=this.isobmffReader.readU32():(m(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);y.samples.push({presentationTimestamp:w+pt,duration:F,byteOffset:g,byteSize:se,isKeyFrame:kr}),g+=se,w+=F}y.presentationTimestamps=y.samples.map((E,F)=>({presentationTimestamp:E.presentationTimestamp,sampleIndex:F})).sort((E,F)=>E.presentationTimestamp-F.presentationTimestamp);let v=y.samples[y.presentationTimestamps[0].sampleIndex],P=y.samples[R(y.presentationTimestamps).sampleIndex];y.startTimestamp=v.presentationTimestamp,y.endTimestamp=P.presentationTimestamp+P.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=mr(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=N(this.internalTrack.fragments,s.fragment.moofOffset,o=>o.moofOffset);return m(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 l=N(this.internalTrack.fragments,o.moofOffset,d=>d.moofOffset);return m(l!==-1),{fragmentIndex:l,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=mr(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=N(this.internalTrack.fragments,a.fragment.moofOffset,l=>l.moofOffset);return m(u!==-1),this.performFragmentedLookup(()=>{let l=c.samples.findIndex((d,p)=>d.isKeyFrame&&p>a.sampleIndex);if(l!==-1)return{fragmentIndex:u,sampleIndex:l,correctSampleFound:!0};{let d=a.fragment;for(;d.nextFragment;){d=d.nextFragment;let p=d.trackData.get(this.internalTrack.id);if(p){let h=N(this.internalTrack.fragments,d.moofOffset,k=>k.moofOffset);m(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];m(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,l=1e6*c.duration/this.internalTrack.timescale,d=this.createChunk(o,u,l,c.isKeyFrame);return this.chunkToFragmentLocation.set(d,{fragment:e,sampleIndex:t}),this.fragmentLocationToChunk.set(s,new WeakRef(d)),d}findSampleInFragmentsForTimestamp(e){let t=A(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(a.presentationTimestamps,e,o=>o.presentationTimestamp);m(c!==-1),r=a.presentationTimestamps[c].sampleIndex,s=e<a.endTimestamp}return{fragmentIndex:t,sampleIndex:r,correctSampleFound:s}}findKeySampleInFragmentsForTimestamp(e){let t=A(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 l=n.isobmffReader,d=await l.reader.source._getSize(),p=null,h=c,b=o,k=null;if(this.internalTrack.fragmentLookupTable){let g=A(this.internalTrack.fragmentLookupTable,t,w=>w.timestamp);g!==-1&&(k=this.internalTrack.fragmentLookupTable[g])}if(c===-1)l.pos=k?.moofOffset??0;else{let g=this.internalTrack.fragments[c];!k||g.moofOffset>=g.moofOffset?(l.pos=g.moofOffset+g.moofSize,p=g):l.pos=k.moofOffset}for(;l.pos<d;){if(p){let y=p.trackData.get(this.internalTrack.id);if(y&&y.startTimestamp>r)break;if(p.nextFragment){l.pos=p.nextFragment.moofOffset+p.nextFragment.moofSize,p=p.nextFragment;continue}}await l.reader.loadRange(l.pos,l.pos+16);let g=l.pos,w=l.readBoxHeader();if(w.name==="moof"){let y=N(n.fragments,g,v=>v.moofOffset);if(y===-1){l.pos=g;let v=await n.readFragment();p&&(p.nextFragment=v),p=v;let{fragmentIndex:P,sampleIndex:E,correctSampleFound:F}=e();if(F){let se=this.internalTrack.fragments[P];return this.fetchChunkInFragment(se,E,s)}P!==-1&&(h=P,b=E)}else{let v=n.fragments[y];p&&(p.nextFragment=v),p=v}}l.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"})}},mr=(i,e)=>{let t=A(i.presentationTimestamps,e,r=>r.presentationTimestamp);return t===-1?-1:i.presentationTimestamps[t].sampleIndex},Ei=(i,e)=>{let t=A(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=A(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=A(i.sampleToChunk,e,k=>k.startSampleIndex),l=i.sampleToChunk[u];m(l);let d=l.startChunkIndex+Math.floor((e-l.startSampleIndex)/l.samplesPerChunk),p=i.chunkOffsets[d],h=0,b=p;if(i.sampleSizes.length===1)b+=o*(e-l.startSampleIndex),h+=o*l.samplesPerChunk;else{let k=l.startSampleIndex+(d-l.startChunkIndex)*l.samplesPerChunk;for(let g=k;g<k+l.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?N(i.keySampleIndices,e,k=>k)!==-1:!0}},Fi=(i,e)=>{if(!i.keySampleIndices)return e;let t=A(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t]??-1},Mi=(i,e)=>{if(!i.keySampleIndices)return e+1;let t=A(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t+1]??-1},dr=(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 me{};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 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 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 lt=class{async*chunks(e,t=1/0){let r=[],{promise:s,resolve:n}=W(),{promise:a,resolve:c}=W(),o=!1,u=[],l=()=>Math.max(2,u.length);(async()=>{let d=e??await this.getFirstChunk();for(;d&&!o&&!(d.timestamp/1e6>=t);){if(r.length>l()){({promise:a,resolve:c}=W()),await a;continue}r.push(d),n(),{promise:s,resolve:n}=W(),d=await this.getNextChunk(d)}o=!0,n()})();try{for(;;)if(r.length>0){yield r.shift();let d=performance.now();for(u.push(d);u.length>0&&d-u[0]>=1e3;)u.shift();c()}else if(!o)await s;else break}finally{o=!0,c()}}},mt=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);m(a),r.decode(n);let c=n;for(;c!==a;){let o=await s.getNextChunk(c);m(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}=W(),{promise:o,resolve:u}=W(),l=!1,d=8,p=await this.createDecoder(g=>{u();let w=g.timestamp/1e6;if(w>=t&&(l=!0),l){g.close();return}n&&(w>e?(r.push(n),s=!0):n.close()),w>=e&&(r.push(g),s=!0),n=s?null:g,r.length>0&&(c(),{promise:a,resolve:c}=W())}),h=this.createChunkDrain(),b=await h.getKeyChunk(e)??await h.getFirstChunk();if(!b)return;let k=!1;(async()=>{let g=b,w=1/0;if(t<1/0){let v=await h.getChunk(t),P=v?v.type==="key"&&v.timestamp/1e6===t?v:await h.getNextKeyChunk(v):null;P&&(w=P.timestamp/1e6)}let y=h.chunks(b,w);for(await y.next();g&&!l;){if(r.length+p.decodeQueueSize>d){({promise:o,resolve:u}=W()),await o;continue}p.decode(g);let v=await y.next();if(v.done)break;g=v.value}await y.return(),await p.flush(),p.close(),!s&&n&&r.push(n),k=!0,c()})();try{for(;;)if(r.length>0)yield r.shift(),u();else if(!k)await a;else break}finally{l=!0,u();for(let g of r)g.close()}}},Ie=class extends lt{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)}},dt=class extends mt{constructor(t){super();this.videoTrack=t}decoderConfig=null;async createDecoder(t){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 Ie(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)}},Ae=class extends lt{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)}},Re=class extends mt{constructor(t){super();this.audioTrack=t}decoderConfig=null;async createDecoder(t){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 Ae(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)}},ft=class{constructor(e){this.audioTrack=e;this.audioDataDrain=new Re(e)}audioDataDrain;audioDataToWrappedArrayBuffer(e){if(!e)return null;let t=new AudioBuffer({numberOfChannels:e.numberOfChannels,length:e.numberOfFrames,sampleRate:e.sampleRate}),r=new Float32Array(e.allocationSize({planeIndex:0,format:"f32-planar"})/4);for(let n=0;n<e.numberOfChannels;n++)e.copyTo(r,{planeIndex:n,format:"f32-planar"}),t.copyToChannel(r,n);let s=1/e.sampleRate;return{buffer:t,timestamp:Math.round(e.timestamp/1e6/s)*s}}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}}};return wr(Vi);})();
+${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(O(t.data,0,2)!==2)return;r+=2;let s=(O(t.data,r+1,r+2)<<1)+O(t.data,r+0,r+1);r+=2,s===3&&r++;let n=O(t.data,r+0,r+1);if(r++,n)return;let a=O(t.data,r+0,r+1);if(r++,a!==0)return;r+=2;let c=O(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];Vt(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:dr,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,dr),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,mr),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 Q=class{},Qe=class extends Q{_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 Le(e,this)}},xe=class extends Q{_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 Ke(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)}},U=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 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)}},Ai=5,Oi=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;Oi(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:rr(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,...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())}},je=class extends U{_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()}},qe=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 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()}},Xe=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 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()}},B=class extends te{_connectedTrack=null;_codec;constructor(e){if(super(),!J.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${J.join(", ")}.`);this._codec=e}},Ge=class extends B{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},_i=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!J.includes(i.codec))throw new TypeError(`Invalid audio codec '${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;_i(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:sr(this.codecConfig.codec,e.numberOfChannels,e.sampleRate),numberOfChannels:e.numberOfChannels,sampleRate:e.sampleRate,bitrate:this.codecConfig.bitrate,...or(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())}},Ye=class extends B{_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()}},Ze=class extends B{_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()}},Je=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 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(),!ge.includes(e))throw new TypeError(`Invalid subtitle codec '${e}'. Must be one of: ${ge.join(", ")}.`);this._codec=e}},et=class extends re{_parser;constructor(e){super(e),this._parser=new Fe({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 tt=class{_muxer;_writer;_tracks=[];_started=!1;_finalizing=!1;_mutex=new H;constructor(e){if(!e||typeof e!="object")throw new TypeError("options must be an object.");if(!(e.format instanceof Q))throw new TypeError("options.format must be an OutputFormat.");if(!(e.target instanceof K))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 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()}},rt=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}},it=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 st=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 st{_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()}async getRotatedWidth(){return await this._backing.getRotation()%180===0?this._backing.getWidth():this._backing.getHeight()}async getRotatedHeight(){return await this._backing.getRotation()%180===0?this._backing.getHeight():this._backing.getWidth()}getDecoderConfig(){return this._backing.getDecoderConfig()}async getCodecMimeType(){return(await this.getDecoderConfig()).codec}},ye=class extends st{_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;Wt(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 Ei=[L(0),L(90),L(180),L(270)],nt=class extends de{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new H;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=W(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,h=this.isobmffReader.readBoxHeader();if(h.name==="moof"){let p=W(this.fragments,l,b=>b.moofOffset);if(p===-1){this.isobmffReader.pos=l;let b=await this.readFragment();o&&(o.nextFragment=b),o=b}else{let b=this.fragments[p];o&&(o.nextFragment=b),o=b}}this.isobmffReader.pos=l+h.totalSize}o&&o.trackData.has(n)&&(u=o)}if(u){let l=u.trackData.get(n);d(l.startTimestampIsFinal),fr(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 Ot(n)),this.tracks.push(s)}else if(s.info.type==="audio"&&s.info.codec!==null){let n=s;if(s.inputTrack=new ye(new _t(n)),this.tracks.push(s),s.info.codec==="aac"){let a=vt(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=Ei.findIndex(m=>m.every((l,h)=>l===o[h]));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 h=this.isobmffReader.readU32(),p=this.isobmffReader.readU32(),b=this.isobmffReader.readU32(),g=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:Dt[a],transfer:Pt[c],matrix:zt[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 h=this.isobmffReader.readU8();d(h===5);let p=this.isobmffReader.readIsomVariableInteger();s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+p)}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,h=[l.readU8.bind(l),l.readU16.bind(l),l.readU24.bind(l),l.readU32.bind(l)],p=h[o],b=h[u],g=h[m],k=this.isobmffReader.readU32();for(let w=0;w<k;w++){let y=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),v=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),D=p(),E=b(),F=g();a.fragmentLookupTable.push({timestamp:y,moofOffset:v})}}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&&(fr(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),h=this.isobmffReader.readU32(),p=this.tracks.find(g=>g.id===h);if(!p)break;let b=this.fragmentTrackDefaults.find(g=>g.trackId===h);this.currentTrack=p,p.currentFragmentState={baseDataOffset:this.currentFragment.implicitBaseDataOffset,sampleDescriptionIndex:b?.defaultSampleDescriptionIndex??null,defaultSampleDuration:b?.defaultSampleDuration??null,defaultSampleSize:b?.defaultSampleSize??null,defaultSampleFlags:b?.defaultSampleFlags??null,startTimestamp:null},n?p.currentFragmentState.baseDataOffset=this.isobmffReader.readU64():l&&(p.currentFragmentState.baseDataOffset=this.currentFragment.moofOffset),a&&(p.currentFragmentState.sampleDescriptionIndex=this.isobmffReader.readU32()),c&&(p.currentFragmentState.defaultSampleDuration=this.isobmffReader.readU32()),o&&(p.currentFragmentState.defaultSampleSize=this.isobmffReader.readU32()),u&&(p.currentFragmentState.defaultSampleFlags=this.isobmffReader.readU32()),m&&(p.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),h=!!(a&2048),p=this.isobmffReader.readU32(),b=s.currentFragmentState.baseDataOffset;c&&(b+=this.isobmffReader.readI32());let g=null;o&&(g=this.isobmffReader.readU32());let k=b;if(p===0){this.currentFragment.implicitBaseDataOffset=k;break}let w=0,y={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(s.id,y);for(let E=0;E<p;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 _e;l?_e=this.isobmffReader.readU32():(d(s.currentFragmentState.defaultSampleFlags!==null),_e=s.currentFragmentState.defaultSampleFlags),E===0&&g!==null&&(_e=g);let pt=0;h&&(n===0?pt=this.isobmffReader.readU32():pt=this.isobmffReader.readI32());let kr=!(_e&65536);y.samples.push({presentationTimestamp:w+pt,duration:F,byteOffset:k,byteSize:se,isKeyFrame:kr}),k+=se,w+=F}y.presentationTimestamps=y.samples.map((E,F)=>({presentationTimestamp:E.presentationTimestamp,sampleIndex:F})).sort((E,F)=>E.presentationTimestamp-F.presentationTimestamp);let v=y.samples[y.presentationTimestamps[0].sampleIndex],D=y.samples[A(y.presentationTimestamps).sampleIndex];y.startTimestamp=v.presentationTimestamp,y.endTimestamp=D.presentationTimestamp+D.duration,this.currentFragment.implicitBaseDataOffset=k}break}this.isobmffReader.pos=r}},at=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=lr(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=W(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=W(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=lr(s,r),a=n===-1?-1:Mi(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=W(this.internalTrack.fragments,a.fragment.moofOffset,m=>m.moofOffset);return d(u!==-1),this.performFragmentedLookup(()=>{let m=c.samples.findIndex((l,h)=>l.isKeyFrame&&h>a.sampleIndex);if(m!==-1)return{fragmentIndex:u,sampleIndex:m,correctSampleFound:!0};{let l=a.fragment;for(;l.nextFragment;){l=l.nextFragment;let h=l.trackData.get(this.internalTrack.id);if(h){let p=W(this.internalTrack.fragments,l.moofOffset,g=>g.moofOffset);d(p!==-1);let b=h.samples.findIndex(g=>g.isKeyFrame);if(b===-1)throw new Error("Not supported: Fragment does not contain key sample.");return{fragmentIndex:p,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=Vi(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=Fi(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 k=this.internalTrack.fragments[c];return this.fetchChunkInFragment(k,o,s)}let m=n.isobmffReader,l=await m.reader.source._getSize(),h=null,p=c,b=o,g=null;if(this.internalTrack.fragmentLookupTable){let k=I(this.internalTrack.fragmentLookupTable,t,w=>w.timestamp);k!==-1&&(g=this.internalTrack.fragmentLookupTable[k])}if(c===-1)m.pos=g?.moofOffset??0;else{let k=this.internalTrack.fragments[c];!g||k.moofOffset>=k.moofOffset?(m.pos=k.moofOffset+k.moofSize,h=k):m.pos=g.moofOffset}for(;m.pos<l;){if(h){let y=h.trackData.get(this.internalTrack.id);if(y&&y.startTimestamp>r)break;if(h.nextFragment){m.pos=h.nextFragment.moofOffset+h.nextFragment.moofSize,h=h.nextFragment;continue}}await m.reader.loadRange(m.pos,m.pos+16);let k=m.pos,w=m.readBoxHeader();if(w.name==="moof"){let y=W(n.fragments,k,v=>v.moofOffset);if(y===-1){m.pos=k;let v=await n.readFragment();h&&(h.nextFragment=v),h=v;let{fragmentIndex:D,sampleIndex:E,correctSampleFound:F}=e();if(F){let se=this.internalTrack.fragments[D];return this.fetchChunkInFragment(se,E,s)}D!==-1&&(p=D,b=E)}else{let v=n.fragments[y];h&&(h.nextFragment=v),h=v}}m.pos=k+w.totalSize}if(p!==-1){let k=this.internalTrack.fragments[p];return this.fetchChunkInFragment(k,b,s)}return null}finally{a()}}},Ot=class extends at{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:ir(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"})}},_t=class extends at{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:nr(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"})}},lr=(i,e)=>{let t=I(i.presentationTimestamps,e,r=>r.presentationTimestamp);return t===-1?-1:i.presentationTimestamps[t].sampleIndex},Fi=(i,e)=>{let t=I(i.sampleTimingEntries,e,g=>g.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,g=>g.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,g=>g.startSampleIndex),m=i.sampleToChunk[u];d(m);let l=m.startChunkIndex+Math.floor((e-m.startSampleIndex)/m.samplesPerChunk),h=i.chunkOffsets[l],p=0,b=h;if(i.sampleSizes.length===1)b+=o*(e-m.startSampleIndex),p+=o*m.samplesPerChunk;else{let g=m.startSampleIndex+(l-m.startChunkIndex)*m.samplesPerChunk;for(let k=g;k<g+m.samplesPerChunk;k++){let w=i.sampleSizes[k];k<e&&(b+=w),p+=w}}return{presentationTimestamp:n,duration:r.delta,sampleOffset:b,sampleSize:o,chunkOffset:h,chunkSize:p,isKeyFrame:i.keySampleIndices?W(i.keySampleIndices,e,g=>g)!==-1:!0}},Mi=(i,e)=>{if(!i.keySampleIndices)return e;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t]??-1},Vi=(i,e)=>{if(!i.keySampleIndices)return e+1;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t+1]??-1},fr=(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 ot=class extends de{};var ct=class{},Et=class extends ct{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 nt(e)}},Ft=class extends ct{async _canReadInput(){return!1}_createDemuxer(e){return new ot(e)}},ve=new Et,hr=ve,pr=ve,ut=new Ft,Mt=ut,br=ut,gr=[ve,Mt];var mt=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 dt=class{async*chunks(e,t=1/0){let r=[],{promise:s,resolve:n}=N(),{promise:a,resolve:c}=N(),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}=N()),await a;continue}r.push(l),n(),{promise:s,resolve:n}=N(),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()}}},lt=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}=N(),{promise:o,resolve:u}=N(),m=!1,l=8,h=await this.createDecoder(k=>{u();let w=k.timestamp/1e6;if(w>=t&&(m=!0),m){k.close();return}n&&(w>e?(r.push(n),s=!0):n.close()),w>=e&&(r.push(k),s=!0),n=s?null:k,r.length>0&&(c(),{promise:a,resolve:c}=N())}),p=this.createChunkDrain(),b=await p.getKeyChunk(e)??await p.getFirstChunk();if(!b)return;let g=!1;(async()=>{let k=b,w=1/0;if(t<1/0){let v=await p.getChunk(t),D=v?v.type==="key"&&v.timestamp/1e6===t?v:await p.getNextKeyChunk(v):null;D&&(w=D.timestamp/1e6)}let y=p.chunks(b,w);for(await y.next();k&&!m;){if(r.length+h.decodeQueueSize>l){({promise:o,resolve:u}=N()),await o;continue}h.decode(k);let v=await y.next();if(v.done)break;k=v.value}await y.return(),await h.flush(),h.close(),!s&&n&&r.push(n),g=!0,c()})();try{for(;;)if(r.length>0)yield r.shift(),u();else if(!g)await a;else break}finally{m=!0,u();for(let k of r)k.close()}}},Re=class extends dt{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)}},Ie=class extends lt{constructor(t){super();this.videoTrack=t}decoderConfig=null;async createDecoder(t){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 Re(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)}},ft=class{constructor(e,t){this.videoTrack=e;this.dimensions=t;this.videoFrameDrain=new Ie(e)}videoFrameDrain;async videoFrameToWrappedCanvas(e){let t=this.dimensions?.width??await this.videoTrack.getRotatedWidth(),r=this.dimensions?.height??await this.videoTrack.getRotatedHeight(),s=await this.videoTrack.getRotation(),n=document.createElement("canvas");n.width=t,n.height=r;let a=n.getContext("2d",{alpha:!1});d(a),a.translate(t/2,r/2),a.rotate(s*Math.PI/180),a.translate(-t/2,-r/2);let[c,o]=s%180===0?[t,r]:[r,t];a.drawImage(e,(t-c)/2,(r-o)/2,c,o);let u={canvas:n,timestamp:e.timestamp/1e6,duration:(e.duration??0)/1e6};return e.close(),u}async getCanvas(e){let t=await this.videoFrameDrain.getFrame(e);return t&&this.videoFrameToWrappedCanvas(t)}async*canvases(e=0,t=1/0){for await(let r of this.videoFrameDrain.frames(e,t))yield this.videoFrameToWrappedCanvas(r)}},Ae=class extends dt{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)}},Oe=class extends lt{constructor(t){super();this.audioTrack=t}decoderConfig=null;async createDecoder(t){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 Ae(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)}},ht=class{constructor(e){this.audioTrack=e;this.audioDataDrain=new Oe(e)}audioDataDrain;audioDataToWrappedArrayBuffer(e){let t=new AudioBuffer({numberOfChannels:e.numberOfChannels,length:e.numberOfFrames,sampleRate:e.sampleRate}),r=new Float32Array(e.allocationSize({planeIndex:0,format:"f32-planar"})/4);for(let a=0;a<e.numberOfChannels;a++)e.copyTo(r,{planeIndex:a,format:"f32-planar"}),t.copyToChannel(r,a);let s=1/e.sampleRate,n={buffer:t,timestamp:Math.round(e.timestamp/1e6/s)*s};return e.close(),n}async getBuffer(e){let t=await this.audioDataDrain.getData(e);return t&&this.audioDataToWrappedArrayBuffer(t)}async*buffers(e=0,t=1/0){for await(let r of this.audioDataDrain.data(e,t))yield this.audioDataToWrappedArrayBuffer(r)}};return yr(Di);})();
 if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Metamuxer)
diff --git a/dist/metamuxer.min.mjs b/dist/metamuxer.min.mjs
index 1a6e6cb..6fc9a42 100644
--- a/dist/metamuxer.min.mjs
+++ b/dist/metamuxer.min.mjs
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de(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 de(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),m(t),m(t.decoderConfig),m(t.decoderConfig.codedWidth!==void 0),m(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),m(t),m(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),m(t),m(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)m(u.timestamp<=t),m(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,l)=>u-l),n=s[0],a=s[1]??n;if(t<a)break;if(e.lastCueEndTimestamp<n){this.auxWriter.seek(0);let u=$t();this.auxBoxWriter.writeBox(u);let l=this.auxWriter.getSlice(0,this.auxWriter.getPos()),d=this.createSampleForTrack(e,l,e.lastCueEndTimestamp,n-e.lastCueEndTimestamp,"key");await this.registerSample(e,d),e.lastCueEndTimestamp=n}this.auxWriter.seek(0);for(let u=0;u<e.cueQueue.length;u++){let l=e.cueQueue[u];if(l.timestamp>=a)break;ee.lastIndex=0;let d=ee.test(l.text),p=l.timestamp+l.duration,h=e.cueToSourceId.get(l);if(h===void 0&&a<p&&(h=e.nextSourceId++,e.cueToSourceId.set(l,h)),l.notes){let k=qt(l.notes);this.auxBoxWriter.writeBox(k)}let b=jt(l.text,d?n:null,l.identifier??null,l.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){m(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=R(e.timeToSampleTable);if(m(u),u.sampleCount===1){u.sampleDelta=o;let d=e.timeToSampleTable[e.timeToSampleTable.length-2];d&&d.sampleDelta===o&&(d.sampleCount++,e.timeToSampleTable.pop(),u=d)}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 l=R(e.compositionTimeOffsetTable);m(l),l.sampleCompositionTimeOffset===n?l.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}),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||R(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 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){m(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 d of r)for(let p of d.currentChunk.samples)u+=p.size;let l=this.boxWriter.measureBox(o)+u;l>=2**32&&(o.largeSize=!0,l=this.boxWriter.measureBox(o)+u),o.size=l,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"){m(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)m(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)m(n.data),this.writer.write(n.data),n.data=null}else if(this.fastStart==="fragmented"){let t=this.writer.getPos(),r=Qt(this.trackDatas);this.boxWriter.writeBox(r);let s=this.writer.getPos()-t;this.writer.seek(this.writer.getPos()-4),this.boxWriter.writeU32(s)}else{m(this.mdat),m(this.ftypSize!==null);let t=this.boxWriter.offsets.get(this.mdat);m(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 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he{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 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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>fi){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},pe=class extends G{buffer=null;_createWriter(){return new re(this)}},at=class extends G{_writable;_options;constructor(e,t={}){if(super(),!(e instanceof WritableStream))throw new TypeError("StreamTarget requires a WritableStream 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c=[96e3,88200,64e3,48e3,44100,32e3,24e3,22050,16e3,12e3,11025,8e3,7350];r<c.length&&(s=c[r])}let n=O(i,e,e+4);e+=4;let a=null;return n>=1&&n<=7&&(a={1:1,2:2,3:3,4:4,5:5,6:6,7:8}[n]),{objectType:t,frequencyIndex:r,sampleRate:s,channelConfiguration:n,numberOfChannels:a}},sr=i=>i==="avc"?{avc:{format:"avc"}}:i==="hevc"?{hevc:{format:"hevc"}}:{},nr=i=>i==="aac"?{aac:{format:"aac"}}:i==="opus"?{opus:{format:"opus"}}:{},Me=i=>{if(!i)throw new TypeError("Video chunk metadata must be provided.");if(typeof i!="object")throw new TypeError("Video chunk metadata must be an object.");if(!i.decoderConfig)throw new TypeError("Video chunk metadata must include a decoder configuration.");if(typeof i.decoderConfig!="object")throw new TypeError("Video chunk metadata decoder configuration must be an object.");if(typeof i.decoderConfig.codec!="string")throw new TypeError("Video chunk metadata decoder configuration must specify a codec 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le(this.auxWriter);ftypSize=null;mdat=null;trackDatas=[];creationTime=Math.floor(Date.now()/1e3)+hi;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(Lt({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;De(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=jt();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),h=m.timestamp+m.duration,p=e.cueToSourceId.get(m);if(p===void 0&&a<h&&(p=e.nextSourceId++,e.cueToSourceId.set(m,p)),m.notes){let g=Xt(m.notes);this.auxBoxWriter.writeBox(g)}let b=qt(m.text,l?n:null,m.identifier??null,m.settings??null,p??null);this.auxBoxWriter.writeBox(b),h===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=nt(t,r);this.boxWriter.writeBox(n);{let o=Oe(!1),u=0;for(let l of r)for(let h of l.currentChunk.samples)u+=h.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=nt(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(Kt(n))}else this.boxWriter.writeBox(s)}e()}};var be=class{value;constructor(e){this.value=e}},ne=class{value;constructor(e){this.value=e}},ge=class{value;constructor(e){this.value=e}};var ct=i=>i<256?1:i<65536?2:i<1<<24?3:i<2**32?4:i<2**40?5:6,ut=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,ar=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 mt=2**15,or="https://github.com/Vanilagy/webm-muxer",cr=6,ur=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"},bi={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=ct(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=ut(e)){e<0&&(e+=2**(t*8)),this.writeUnsignedInt(e,t)}writeEBMLVarInt(e,t=ar(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??ct(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 ge){let t=e.size??ut(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:or},{id:22337,data:or},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:bi[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: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},ye(r)?{id:21936,data:[{id:21937,data:q[r.matrix]},{id:21946,data:j[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:Q(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:cr,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;De(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,h=>{let b=Re(h.slice(1,-1))-o;return`<${Ie(b)}>`});let u=M.encode(c),m=`${t.settings??""}
 ${t.identifier??""}
-${t.notes??""}`,d=this.createInternalChunk(u,a,t.duration,"key",l.trim()?M.encode(l):null);n.chunkQueue.push(d),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(O(t.data,0,2)!==2)return;r+=2;let s=(O(t.data,r+1,r+2)<<1)+O(t.data,r+0,r+1);r+=2,s===3&&r++;let n=O(t.data,r+0,r+1);if(r++,n)return;let a=O(t.data,r+0,r+1);if(r++,a!==0)return;r+=2;let c=O(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(l=>{if(l.track.source._closed)return!0;if(e===l)return t.type==="key";let d=l.chunkQueue[0];return d&&d.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 l={id:163,data:[c,t.data]};this.writeEBML(l)}else{let l={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(l)}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(){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,cr),this.writer.seek(t);let r=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(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(),m(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{},lt=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)}},N=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!ie.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${ie.join(", ")}.`);this._codec=e}},mt=class extends N{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},bi=5,ki=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!ie.includes(i.codec))throw new TypeError(`Invalid video codec '${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),m(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)}),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 N{_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 N{_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 N{_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()}},W=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!se.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${se.join(", ")}.`);this._codec=e}},ht=class extends W{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},gi=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!se.includes(i.codec))throw new TypeError(`Invalid audio codec '${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),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,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)}),m(this.source._connectedTrack),this.muxer=this.source._connectedTrack.output._muxer)}async flush(){this.encoder&&(await this.encoder.flush(),this.encoder.close())}},bt=class extends W{_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 W{_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 W{_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 H;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 N))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 W))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 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;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=A(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)}m(n),this.totalStoredBytes-=n.bytes.byteLength,this.loadedSegments.splice(a,1)}}getViewAndOffset(e,t){let r=A(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=A(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=[L(0),L(90),L(180),L(270)],Ne=class extends ue{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new H;chunkReader;constructor(e){super(e),this.isobmffReader=new Z(e._mainReader),this.chunkReader=new Z(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();m(t.name==="moof"),await this.isobmffReader.reader.loadRange(e,e+t.totalSize),this.isobmffReader.pos=e,this.traverseBox();let r=U(this.fragments,e,n=>n.moofOffset);m(r!==-1);let s=this.fragments[r];m(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(d=>d.id===n);this.isobmffReader.pos=0;let o=null,u=null,l=A(c.fragments,e-1,d=>d.moofOffset);for(l!==-1&&(o=c.fragments[l],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 d=this.isobmffReader.pos,p=this.isobmffReader.readBoxHeader();if(p.name==="moof"){let h=U(this.fragments,d,b=>b.moofOffset);if(h===-1){this.isobmffReader.pos=d;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=d+p.totalSize}o&&o.trackData.has(n)&&(u=o)}if(u){let d=u.trackData.get(n);m(d.startTimestampIsFinal),lr(a,d.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;m(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(l=>l.every((d,p)=>d===o[p]));u===-1?s.rotation=0:s.rotation=90*u}break;case"mdhd":{let s=this.currentTrack;m(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;m(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;m(s),s.sampleTableOffset=e,this.readContiguousBoxes(t.contentSize)}break;case"stsd":{let s=this.currentTrack;if(m(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 l=this.isobmffReader.readU16();this.isobmffReader.pos+=6;let d=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,d=this.isobmffReader.readF64(),l=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=l,s.info.sampleRate=d,this.readContiguousBoxes(e+o.totalSize-this.isobmffReader.pos)}}}break;case"avcC":{let s=this.currentTrack;m(s&&s.info),s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+t.contentSize)}break;case"hvcC":{let s=this.currentTrack;m(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(m(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;m(s&&s.info),this.isobmffReader.pos+=4;let n=this.isobmffReader.readU8();m(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 l=this.isobmffReader.readU8();m(l===4),this.isobmffReader.readIsomVariableInteger();let d=this.isobmffReader.readU8();m(d===64),this.isobmffReader.pos+=12;let p=this.isobmffReader.readU8();m(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(m(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(),l=this.isobmffReader.readU32();s.sampleTable.sampleTimingEntries.push({startIndex:a,startDecodeTimestamp:c,count:u,delta:l}),a+=u,c+=u*l}}break;case"ctts":{let s=this.currentTrack;if(m(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(m(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(m(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(m(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(),l=this.isobmffReader.readU32();s.sampleTable.sampleToChunk.push({startSampleIndex:-1,startChunkIndex:o,samplesPerChunk:u,sampleDescriptionIndex:l})}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(m(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(m(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,l=c&3,d=this.isobmffReader,p=[d.readU8.bind(d),d.readU16.bind(d),d.readU24.bind(d),d.readU32.bind(d)],h=p[o],b=p[u],k=p[l],g=this.isobmffReader.readU32();for(let w=0;w<g;w++){let y=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),v=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),P=h(),E=b(),F=k();a.fragmentLookupTable.push({timestamp:y,moofOffset:v})}}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=A(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=R(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(m(this.currentFragment),this.readContiguousBoxes(t.contentSize),this.currentTrack){let s=this.currentFragment.trackData.get(this.currentTrack.id);if(s){let n=A(this.currentTrack.fragments,this.currentFragment.moofOffset,c=>c.moofOffset);this.currentTrack.fragments.splice(n+1,0,this.currentFragment);let{currentFragmentState:a}=this.currentTrack;m(a),a.startTimestamp!==null&&(lr(s,a.startTimestamp),s.startTimestampIsFinal=!0)}this.currentTrack.currentFragmentState=null,this.currentTrack=null}break;case"tfhd":{m(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),l=!!(s&65536),d=!!(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():d&&(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()),l&&(h.currentFragmentState.defaultSampleDuration=0)}break;case"tfdt":{let s=this.currentTrack;if(!s)break;m(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(m(this.currentFragment),m(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),l=!!(a&512),d=!!(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,y={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(s.id,y);for(let E=0;E<h;E++){let F;u?F=this.isobmffReader.readU32():(m(s.currentFragmentState.defaultSampleDuration!==null),F=s.currentFragmentState.defaultSampleDuration);let J;l?J=this.isobmffReader.readU32():(m(s.currentFragmentState.defaultSampleSize!==null),J=s.currentFragmentState.defaultSampleSize);let we;d?we=this.isobmffReader.readU32():(m(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 dr=!(we&65536);y.samples.push({presentationTimestamp:w+Ge,duration:F,byteOffset:g,byteSize:J,isKeyFrame:dr}),g+=J,w+=F}y.presentationTimestamps=y.samples.map((E,F)=>({presentationTimestamp:E.presentationTimestamp,sampleIndex:F})).sort((E,F)=>E.presentationTimestamp-F.presentationTimestamp);let v=y.samples[y.presentationTimestamps[0].sampleIndex],P=y.samples[R(y.presentationTimestamps).sampleIndex];y.startTimestamp=v.presentationTimestamp,y.endTimestamp=P.presentationTimestamp+P.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=U(this.internalTrack.fragments,s.fragment.moofOffset,o=>o.moofOffset);return m(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 l=U(this.internalTrack.fragments,o.moofOffset,d=>d.moofOffset);return m(l!==-1),{fragmentIndex:l,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=U(this.internalTrack.fragments,a.fragment.moofOffset,l=>l.moofOffset);return m(u!==-1),this.performFragmentedLookup(()=>{let l=c.samples.findIndex((d,p)=>d.isKeyFrame&&p>a.sampleIndex);if(l!==-1)return{fragmentIndex:u,sampleIndex:l,correctSampleFound:!0};{let d=a.fragment;for(;d.nextFragment;){d=d.nextFragment;let p=d.trackData.get(this.internalTrack.id);if(p){let h=U(this.internalTrack.fragments,d.moofOffset,k=>k.moofOffset);m(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];m(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,l=1e6*c.duration/this.internalTrack.timescale,d=this.createChunk(o,u,l,c.isKeyFrame);return this.chunkToFragmentLocation.set(d,{fragment:e,sampleIndex:t}),this.fragmentLocationToChunk.set(s,new WeakRef(d)),d}findSampleInFragmentsForTimestamp(e){let t=A(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(a.presentationTimestamps,e,o=>o.presentationTimestamp);m(c!==-1),r=a.presentationTimestamps[c].sampleIndex,s=e<a.endTimestamp}return{fragmentIndex:t,sampleIndex:r,correctSampleFound:s}}findKeySampleInFragmentsForTimestamp(e){let t=A(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 l=n.isobmffReader,d=await l.reader.source._getSize(),p=null,h=c,b=o,k=null;if(this.internalTrack.fragmentLookupTable){let g=A(this.internalTrack.fragmentLookupTable,t,w=>w.timestamp);g!==-1&&(k=this.internalTrack.fragmentLookupTable[g])}if(c===-1)l.pos=k?.moofOffset??0;else{let g=this.internalTrack.fragments[c];!k||g.moofOffset>=g.moofOffset?(l.pos=g.moofOffset+g.moofSize,p=g):l.pos=k.moofOffset}for(;l.pos<d;){if(p){let y=p.trackData.get(this.internalTrack.id);if(y&&y.startTimestamp>r)break;if(p.nextFragment){l.pos=p.nextFragment.moofOffset+p.nextFragment.moofSize,p=p.nextFragment;continue}}await l.reader.loadRange(l.pos,l.pos+16);let g=l.pos,w=l.readBoxHeader();if(w.name==="moof"){let y=U(n.fragments,g,v=>v.moofOffset);if(y===-1){l.pos=g;let v=await n.readFragment();p&&(p.nextFragment=v),p=v;let{fragmentIndex:P,sampleIndex:E,correctSampleFound:F}=e();if(F){let J=this.internalTrack.fragments[P];return this.fetchChunkInFragment(J,E,s)}P!==-1&&(h=P,b=E)}else{let v=n.fragments[y];p&&(p.nextFragment=v),p=v}}l.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=A(i.presentationTimestamps,e,r=>r.presentationTimestamp);return t===-1?-1:i.presentationTimestamps[t].sampleIndex},xi=(i,e)=>{let t=A(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=A(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=A(i.sampleToChunk,e,k=>k.startSampleIndex),l=i.sampleToChunk[u];m(l);let d=l.startChunkIndex+Math.floor((e-l.startSampleIndex)/l.samplesPerChunk),p=i.chunkOffsets[d],h=0,b=p;if(i.sampleSizes.length===1)b+=o*(e-l.startSampleIndex),h+=o*l.samplesPerChunk;else{let k=l.startSampleIndex+(d-l.startChunkIndex)*l.samplesPerChunk;for(let g=k;g<k+l.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?U(i.keySampleIndices,e,k=>k)!==-1:!0}},Ci=(i,e)=>{if(!i.keySampleIndices)return e;let t=A(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t]??-1},Si=(i,e)=>{if(!i.keySampleIndices)return e+1;let t=A(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 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,mr=At,vi=At,Ii=[Ke,mr];var Rt=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(),m(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 Qe=class{async*chunks(e,t=1/0){let r=[],{promise:s,resolve:n}=B(),{promise:a,resolve:c}=B(),o=!1,u=[],l=()=>Math.max(2,u.length);(async()=>{let d=e??await this.getFirstChunk();for(;d&&!o&&!(d.timestamp/1e6>=t);){if(r.length>l()){({promise:a,resolve:c}=B()),await a;continue}r.push(d),n(),{promise:s,resolve:n}=B(),d=await this.getNextChunk(d)}o=!0,n()})();try{for(;;)if(r.length>0){yield r.shift();let d=performance.now();for(u.push(d);u.length>0&&d-u[0]>=1e3;)u.shift();c()}else if(!o)await s;else break}finally{o=!0,c()}}},$e=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);m(a),r.decode(n);let c=n;for(;c!==a;){let o=await s.getNextChunk(c);m(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}=B(),{promise:o,resolve:u}=B(),l=!1,d=8,p=await this.createDecoder(g=>{u();let w=g.timestamp/1e6;if(w>=t&&(l=!0),l){g.close();return}n&&(w>e?(r.push(n),s=!0):n.close()),w>=e&&(r.push(g),s=!0),n=s?null:g,r.length>0&&(c(),{promise:a,resolve:c}=B())}),h=this.createChunkDrain(),b=await h.getKeyChunk(e)??await h.getFirstChunk();if(!b)return;let k=!1;(async()=>{let g=b,w=1/0;if(t<1/0){let v=await h.getChunk(t),P=v?v.type==="key"&&v.timestamp/1e6===t?v:await h.getNextKeyChunk(v):null;P&&(w=P.timestamp/1e6)}let y=h.chunks(b,w);for(await y.next();g&&!l;){if(r.length+p.decodeQueueSize>d){({promise:o,resolve:u}=B()),await o;continue}p.decode(g);let v=await y.next();if(v.done)break;g=v.value}await y.return(),await p.flush(),p.close(),!s&&n&&r.push(n),k=!0,c()})();try{for(;;)if(r.length>0)yield r.shift(),u();else if(!k)await a;else break}finally{l=!0,u();for(let g of r)g.close()}}},je=class extends Qe{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 $e{constructor(t){super();this.videoTrack=t}decoderConfig=null;async createDecoder(t){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 Qe{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 $e{constructor(t){super();this.audioTrack=t}decoderConfig=null;async createDecoder(t){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}),r=new Float32Array(e.allocationSize({planeIndex:0,format:"f32-planar"})/4);for(let n=0;n<e.numberOfChannels;n++)e.copyTo(r,{planeIndex:n,format:"f32-planar"}),t.copyToChannel(r,n);let s=1/e.sampleRate;return{buffer:t,timestamp:Math.round(e.timestamp/1e6/s)*s}}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,W as AudioSource,St as BlobSource,ft as CanvasSource,qe as EncodedAudioChunkDrain,ht as EncodedAudioChunkSource,je as EncodedVideoChunkDrain,mt as EncodedVideoChunkSource,Ke as ISOBMFF,Rt as Input,At as MATROSKA,mr as MKV,yi as MOV,wi as MP4,oe as MediaSource,gt as MediaStreamAudioTrackSource,pt as MediaStreamVideoTrackSource,Ue as MkvOutputFormat,lt 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,dt as VideoFrameSource,N as VideoSource,vi 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(O(t.data,0,2)!==2)return;r+=2;let s=(O(t.data,r+1,r+2)<<1)+O(t.data,r+0,r+1);r+=2,s===3&&r++;let n=O(t.data,r+0,r+1);if(r++,n)return;let a=O(t.data,r+0,r+1);if(r++,a!==0)return;r+=2;let c=O(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];Ft(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>=mt)throw new Error(`Current Matroska cluster exceeded its maximum allowed length of ${mt} milliseconds. In order to produce a correct WebM file, you must pass in a key frame at least every ${mt} 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 ge(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:ur,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,ur),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,cr),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{},dt=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 Pe(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)}},W=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!ie.includes(e))throw new TypeError(`Invalid video codec '${e}'. Must be one of: ${ie.join(", ")}.`);this._codec=e}},lt=class extends W{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedVideoChunk))throw new TypeError("chunk must be an EncodedVideoChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedVideoChunk(this._connectedTrack,e,t)}},gi=5,ki=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!ie.includes(i.codec))throw new TypeError(`Invalid video codec '${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'.")},ke=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/gi);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:er(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,...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())}},ft=class extends W{_encoder;constructor(e){super(e.codec),this._encoder=new ke(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()}},ht=class extends W{_encoder;_canvas;constructor(e,t){if(!(e instanceof HTMLCanvasElement))throw new TypeError("canvas must be an HTMLCanvasElement.");super(t.codec),this._encoder=new ke(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 W{_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 ke(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()}},N=class extends oe{_connectedTrack=null;_codec;constructor(e){if(super(),!se.includes(e))throw new TypeError(`Invalid audio codec '${e}'. Must be one of: ${se.join(", ")}.`);this._codec=e}},bt=class extends N{constructor(e){super(e)}digest(e,t){if(!(e instanceof EncodedAudioChunk))throw new TypeError("chunk must be an EncodedAudioChunk.");return this._ensureValidDigest(),this._connectedTrack.output._muxer.addEncodedAudioChunk(this._connectedTrack,e,t)}},Ti=i=>{if(!i||typeof i!="object")throw new TypeError("Codec config must be an object.");if(!se.includes(i.codec))throw new TypeError(`Invalid audio codec '${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;Ti(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:rr(this.codecConfig.codec,e.numberOfChannels,e.sampleRate),numberOfChannels:e.numberOfChannels,sampleRate:e.sampleRate,bitrate:this.codecConfig.bitrate,...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())}},gt=class extends N{_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 N{_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()}},Tt=class extends N{_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}},xt=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 Ct=class{_muxer;_writer;_tracks=[];_started=!1;_finalizing=!1;_mutex=new H;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 W))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 N))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()}},St=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}},wt=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()}async getRotatedWidth(){return await this._backing.getRotation()%180===0?this._backing.getWidth():this._backing.getHeight()}async getRotatedHeight(){return await this._backing.getRotation()%180===0?this._backing.getHeight():this._backing.getWidth()}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;Ut(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 xi=[L(0),L(90),L(180),L(270)],We=class extends ue{isobmffReader;currentTrack=null;tracks=[];metadataPromise=null;movieTimescale=-1;movieDurationInTimescale=-1;isFragmented=!1;fragmentTrackDefaults=[];fragments=[];currentFragment=null;fragmentLookupMutex=new H;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=U(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,h=this.isobmffReader.readBoxHeader();if(h.name==="moof"){let p=U(this.fragments,l,b=>b.moofOffset);if(p===-1){this.isobmffReader.pos=l;let b=await this.readFragment();o&&(o.nextFragment=b),o=b}else{let b=this.fragments[p];o&&(o.nextFragment=b),o=b}}this.isobmffReader.pos=l+h.totalSize}o&&o.trackData.has(n)&&(u=o)}if(u){let l=u.trackData.get(n);d(l.startTimestampIsFinal),dr(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 yt(n)),this.tracks.push(s)}else if(s.info.type==="audio"&&s.info.codec!==null){let n=s;if(s.inputTrack=new Se(new vt(n)),this.tracks.push(s),s.info.codec==="aac"){let a=ot(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=xi.findIndex(m=>m.every((l,h)=>l===o[h]));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 h=this.isobmffReader.readU32(),p=this.isobmffReader.readU32(),b=this.isobmffReader.readU32(),g=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:Mt[a],transfer:Vt[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 h=this.isobmffReader.readU8();d(h===5);let p=this.isobmffReader.readIsomVariableInteger();s.info.codecDescription=this.isobmffReader.readRange(this.isobmffReader.pos,this.isobmffReader.pos+p)}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,h=[l.readU8.bind(l),l.readU16.bind(l),l.readU24.bind(l),l.readU32.bind(l)],p=h[o],b=h[u],g=h[m],k=this.isobmffReader.readU32();for(let w=0;w<k;w++){let y=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),v=s===1?this.isobmffReader.readU64():this.isobmffReader.readU32(),D=p(),E=b(),F=g();a.fragmentLookupTable.push({timestamp:y,moofOffset:v})}}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&&(dr(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),h=this.isobmffReader.readU32(),p=this.tracks.find(g=>g.id===h);if(!p)break;let b=this.fragmentTrackDefaults.find(g=>g.trackId===h);this.currentTrack=p,p.currentFragmentState={baseDataOffset:this.currentFragment.implicitBaseDataOffset,sampleDescriptionIndex:b?.defaultSampleDescriptionIndex??null,defaultSampleDuration:b?.defaultSampleDuration??null,defaultSampleSize:b?.defaultSampleSize??null,defaultSampleFlags:b?.defaultSampleFlags??null,startTimestamp:null},n?p.currentFragmentState.baseDataOffset=this.isobmffReader.readU64():l&&(p.currentFragmentState.baseDataOffset=this.currentFragment.moofOffset),a&&(p.currentFragmentState.sampleDescriptionIndex=this.isobmffReader.readU32()),c&&(p.currentFragmentState.defaultSampleDuration=this.isobmffReader.readU32()),o&&(p.currentFragmentState.defaultSampleSize=this.isobmffReader.readU32()),u&&(p.currentFragmentState.defaultSampleFlags=this.isobmffReader.readU32()),m&&(p.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),h=!!(a&2048),p=this.isobmffReader.readU32(),b=s.currentFragmentState.baseDataOffset;c&&(b+=this.isobmffReader.readI32());let g=null;o&&(g=this.isobmffReader.readU32());let k=b;if(p===0){this.currentFragment.implicitBaseDataOffset=k;break}let w=0,y={startTimestamp:0,endTimestamp:0,samples:[],presentationTimestamps:[],startTimestampIsFinal:!1};this.currentFragment.trackData.set(s.id,y);for(let E=0;E<p;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&&g!==null&&(we=g);let Ye=0;h&&(n===0?Ye=this.isobmffReader.readU32():Ye=this.isobmffReader.readI32());let fr=!(we&65536);y.samples.push({presentationTimestamp:w+Ye,duration:F,byteOffset:k,byteSize:J,isKeyFrame:fr}),k+=J,w+=F}y.presentationTimestamps=y.samples.map((E,F)=>({presentationTimestamp:E.presentationTimestamp,sampleIndex:F})).sort((E,F)=>E.presentationTimestamp-F.presentationTimestamp);let v=y.samples[y.presentationTimestamps[0].sampleIndex],D=y.samples[A(y.presentationTimestamps).sampleIndex];y.startTimestamp=v.presentationTimestamp,y.endTimestamp=D.presentationTimestamp+D.duration,this.currentFragment.implicitBaseDataOffset=k}break}this.isobmffReader.pos=r}},Ne=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=mr(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=U(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=U(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=mr(s,r),a=n===-1?-1:Si(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=U(this.internalTrack.fragments,a.fragment.moofOffset,m=>m.moofOffset);return d(u!==-1),this.performFragmentedLookup(()=>{let m=c.samples.findIndex((l,h)=>l.isKeyFrame&&h>a.sampleIndex);if(m!==-1)return{fragmentIndex:u,sampleIndex:m,correctSampleFound:!0};{let l=a.fragment;for(;l.nextFragment;){l=l.nextFragment;let h=l.trackData.get(this.internalTrack.id);if(h){let p=U(this.internalTrack.fragments,l.moofOffset,g=>g.moofOffset);d(p!==-1);let b=h.samples.findIndex(g=>g.isKeyFrame);if(b===-1)throw new Error("Not supported: Fragment does not contain key sample.");return{fragmentIndex:p,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=wi(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=Ci(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 k=this.internalTrack.fragments[c];return this.fetchChunkInFragment(k,o,s)}let m=n.isobmffReader,l=await m.reader.source._getSize(),h=null,p=c,b=o,g=null;if(this.internalTrack.fragmentLookupTable){let k=I(this.internalTrack.fragmentLookupTable,t,w=>w.timestamp);k!==-1&&(g=this.internalTrack.fragmentLookupTable[k])}if(c===-1)m.pos=g?.moofOffset??0;else{let k=this.internalTrack.fragments[c];!g||k.moofOffset>=k.moofOffset?(m.pos=k.moofOffset+k.moofSize,h=k):m.pos=g.moofOffset}for(;m.pos<l;){if(h){let y=h.trackData.get(this.internalTrack.id);if(y&&y.startTimestamp>r)break;if(h.nextFragment){m.pos=h.nextFragment.moofOffset+h.nextFragment.moofSize,h=h.nextFragment;continue}}await m.reader.loadRange(m.pos,m.pos+16);let k=m.pos,w=m.readBoxHeader();if(w.name==="moof"){let y=U(n.fragments,k,v=>v.moofOffset);if(y===-1){m.pos=k;let v=await n.readFragment();h&&(h.nextFragment=v),h=v;let{fragmentIndex:D,sampleIndex:E,correctSampleFound:F}=e();if(F){let J=this.internalTrack.fragments[D];return this.fetchChunkInFragment(J,E,s)}D!==-1&&(p=D,b=E)}else{let v=n.fragments[y];h&&(h.nextFragment=v),h=v}}m.pos=k+w.totalSize}if(p!==-1){let k=this.internalTrack.fragments[p];return this.fetchChunkInFragment(k,b,s)}return null}finally{a()}}},yt=class extends Ne{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:tr(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"})}},vt=class extends Ne{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:ir(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"})}},mr=(i,e)=>{let t=I(i.presentationTimestamps,e,r=>r.presentationTimestamp);return t===-1?-1:i.presentationTimestamps[t].sampleIndex},Ci=(i,e)=>{let t=I(i.sampleTimingEntries,e,g=>g.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,g=>g.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,g=>g.startSampleIndex),m=i.sampleToChunk[u];d(m);let l=m.startChunkIndex+Math.floor((e-m.startSampleIndex)/m.samplesPerChunk),h=i.chunkOffsets[l],p=0,b=h;if(i.sampleSizes.length===1)b+=o*(e-m.startSampleIndex),p+=o*m.samplesPerChunk;else{let g=m.startSampleIndex+(l-m.startChunkIndex)*m.samplesPerChunk;for(let k=g;k<g+m.samplesPerChunk;k++){let w=i.sampleSizes[k];k<e&&(b+=w),p+=w}}return{presentationTimestamp:n,duration:r.delta,sampleOffset:b,sampleSize:o,chunkOffset:h,chunkSize:p,isKeyFrame:i.keySampleIndices?U(i.keySampleIndices,e,g=>g)!==-1:!0}},Si=(i,e)=>{if(!i.keySampleIndices)return e;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t]??-1},wi=(i,e)=>{if(!i.keySampleIndices)return e+1;let t=I(i.keySampleIndices,e,r=>r);return i.keySampleIndices[t+1]??-1},dr=(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{},Rt=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 We(e)}},It=class extends Le{async _canReadInput(){return!1}_createDemuxer(e){return new He(e)}},Ke=new Rt,yi=Ke,vi=Ke,At=new It,lr=At,Ri=At,Ii=[Ke,lr];var Ot=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 Qe=class{async*chunks(e,t=1/0){let r=[],{promise:s,resolve:n}=B(),{promise:a,resolve:c}=B(),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}=B()),await a;continue}r.push(l),n(),{promise:s,resolve:n}=B(),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()}}},$e=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}=B(),{promise:o,resolve:u}=B(),m=!1,l=8,h=await this.createDecoder(k=>{u();let w=k.timestamp/1e6;if(w>=t&&(m=!0),m){k.close();return}n&&(w>e?(r.push(n),s=!0):n.close()),w>=e&&(r.push(k),s=!0),n=s?null:k,r.length>0&&(c(),{promise:a,resolve:c}=B())}),p=this.createChunkDrain(),b=await p.getKeyChunk(e)??await p.getFirstChunk();if(!b)return;let g=!1;(async()=>{let k=b,w=1/0;if(t<1/0){let v=await p.getChunk(t),D=v?v.type==="key"&&v.timestamp/1e6===t?v:await p.getNextKeyChunk(v):null;D&&(w=D.timestamp/1e6)}let y=p.chunks(b,w);for(await y.next();k&&!m;){if(r.length+h.decodeQueueSize>l){({promise:o,resolve:u}=B()),await o;continue}h.decode(k);let v=await y.next();if(v.done)break;k=v.value}await y.return(),await h.flush(),h.close(),!s&&n&&r.push(n),g=!0,c()})();try{for(;;)if(r.length>0)yield r.shift(),u();else if(!g)await a;else break}finally{m=!0,u();for(let k of r)k.close()}}},je=class extends Qe{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)}},qe=class extends $e{constructor(t){super();this.videoTrack=t}decoderConfig=null;async createDecoder(t){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)}},_t=class{constructor(e,t){this.videoTrack=e;this.dimensions=t;this.videoFrameDrain=new qe(e)}videoFrameDrain;async videoFrameToWrappedCanvas(e){let t=this.dimensions?.width??await this.videoTrack.getRotatedWidth(),r=this.dimensions?.height??await this.videoTrack.getRotatedHeight(),s=await this.videoTrack.getRotation(),n=document.createElement("canvas");n.width=t,n.height=r;let a=n.getContext("2d",{alpha:!1});d(a),a.translate(t/2,r/2),a.rotate(s*Math.PI/180),a.translate(-t/2,-r/2);let[c,o]=s%180===0?[t,r]:[r,t];a.drawImage(e,(t-c)/2,(r-o)/2,c,o);let u={canvas:n,timestamp:e.timestamp/1e6,duration:(e.duration??0)/1e6};return e.close(),u}async getCanvas(e){let t=await this.videoFrameDrain.getFrame(e);return t&&this.videoFrameToWrappedCanvas(t)}async*canvases(e=0,t=1/0){for await(let r of this.videoFrameDrain.frames(e,t))yield this.videoFrameToWrappedCanvas(r)}},Xe=class extends Qe{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)}},Ge=class extends $e{constructor(t){super();this.audioTrack=t}decoderConfig=null;async createDecoder(t){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 Xe(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)}},Et=class{constructor(e){this.audioTrack=e;this.audioDataDrain=new Ge(e)}audioDataDrain;audioDataToWrappedArrayBuffer(e){let t=new AudioBuffer({numberOfChannels:e.numberOfChannels,length:e.numberOfFrames,sampleRate:e.sampleRate}),r=new Float32Array(e.allocationSize({planeIndex:0,format:"f32-planar"})/4);for(let a=0;a<e.numberOfChannels;a++)e.copyTo(r,{planeIndex:a,format:"f32-planar"}),t.copyToChannel(r,a);let s=1/e.sampleRate,n={buffer:t,timestamp:Math.round(e.timestamp/1e6/s)*s};return e.close(),n}async getBuffer(e){let t=await this.audioDataDrain.getData(e);return t&&this.audioDataToWrappedArrayBuffer(t)}async*buffers(e=0,t=1/0){for await(let r of this.audioDataDrain.data(e,t))yield this.audioDataToWrappedArrayBuffer(r)}};export{Ii as ALL_FORMATS,se as AUDIO_CODECS,St as ArrayBufferSource,pe as ArrayBufferTarget,Et as AudioBufferDrain,kt as AudioBufferSource,Ge as AudioDataDrain,gt as AudioDataSource,N as AudioSource,wt as BlobSource,_t as CanvasDrain,ht as CanvasSource,Xe as EncodedAudioChunkDrain,bt as EncodedAudioChunkSource,je as EncodedVideoChunkDrain,lt as EncodedVideoChunkSource,Ke as ISOBMFF,Ot as Input,At as MATROSKA,lr as MKV,vi as MOV,yi as MP4,oe as MediaSource,Tt as MediaStreamAudioTrackSource,pt as MediaStreamVideoTrackSource,Ue as MkvOutputFormat,dt as Mp4OutputFormat,Ct as Output,Y as OutputFormat,Fe as SUBTITLE_CODECS,xe as Source,at as StreamTarget,ce as SubtitleSource,G as Target,xt as TextSubtitleSource,ie as VIDEO_CODECS,qe as VideoFrameDrain,ft as VideoFrameSource,W as VideoSource,Ri as WEBM,ae as WebMOutputFormat};
diff --git a/dist/metamuxer.mjs b/dist/metamuxer.mjs
index 5a60433..196f5f8 100644
--- a/dist/metamuxer.mjs
+++ b/dist/metamuxer.mjs
@@ -4106,6 +4106,14 @@ var InputVideoTrack = class extends InputTrack {
   getRotation() {
     return this._backing.getRotation();
   }
+  async getRotatedWidth() {
+    const rotation = await this._backing.getRotation();
+    return rotation % 180 === 0 ? this._backing.getWidth() : this._backing.getHeight();
+  }
+  async getRotatedHeight() {
+    const rotation = await this._backing.getRotation();
+    return rotation % 180 === 0 ? this._backing.getHeight() : this._backing.getWidth();
+  }
   getDecoderConfig() {
     return this._backing.getDecoderConfig();
   }
@@ -6170,6 +6178,45 @@ var VideoFrameDrain = class extends BaseMediaFrameDrain {
     return this.mediaFrames(startTimestamp, endTimestamp);
   }
 };
+var CanvasDrain = class {
+  constructor(videoTrack, dimensions) {
+    this.videoTrack = videoTrack;
+    this.dimensions = dimensions;
+    this.videoFrameDrain = new VideoFrameDrain(videoTrack);
+  }
+  videoFrameDrain;
+  async videoFrameToWrappedCanvas(frame) {
+    const width = this.dimensions?.width ?? await this.videoTrack.getRotatedWidth();
+    const height = this.dimensions?.height ?? await this.videoTrack.getRotatedHeight();
+    const rotation = await this.videoTrack.getRotation();
+    const canvas = document.createElement("canvas");
+    canvas.width = width;
+    canvas.height = height;
+    const context = canvas.getContext("2d", { alpha: false });
+    assert(context);
+    context.translate(width / 2, height / 2);
+    context.rotate(rotation * Math.PI / 180);
+    context.translate(-width / 2, -height / 2);
+    const [imageWidth, imageHeight] = rotation % 180 === 0 ? [width, height] : [height, width];
+    context.drawImage(frame, (width - imageWidth) / 2, (height - imageHeight) / 2, imageWidth, imageHeight);
+    const result = {
+      canvas,
+      timestamp: frame.timestamp / 1e6,
+      duration: (frame.duration ?? 0) / 1e6
+    };
+    frame.close();
+    return result;
+  }
+  async getCanvas(timestamp) {
+    const frame = await this.videoFrameDrain.getFrame(timestamp);
+    return frame && this.videoFrameToWrappedCanvas(frame);
+  }
+  async *canvases(startTimestamp = 0, endTimestamp = Infinity) {
+    for await (const frame of this.videoFrameDrain.frames(startTimestamp, endTimestamp)) {
+      yield this.videoFrameToWrappedCanvas(frame);
+    }
+  }
+};
 var EncodedAudioChunkDrain = class extends BaseChunkDrain {
   constructor(audioTrack) {
     super();
@@ -6226,9 +6273,6 @@ var AudioBufferDrain = class {
   }
   audioDataDrain;
   audioDataToWrappedArrayBuffer(data) {
-    if (!data) {
-      return null;
-    }
     const audioBuffer = new AudioBuffer({
       numberOfChannels: data.numberOfChannels,
       length: data.numberOfFrames,
@@ -6240,21 +6284,21 @@ var AudioBufferDrain = class {
       audioBuffer.copyToChannel(dataBytes, i);
     }
     const sampleDuration = 1 / data.sampleRate;
-    return {
+    const result = {
       buffer: audioBuffer,
       // Rounding the timestamp based on the sample duration removes audio playback artifacts
       timestamp: Math.round(data.timestamp / 1e6 / sampleDuration) * sampleDuration
     };
+    data.close();
+    return result;
   }
   async getBuffer(timestamp) {
     const data = await this.audioDataDrain.getData(timestamp);
-    return this.audioDataToWrappedArrayBuffer(data);
+    return data && 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;
+      yield this.audioDataToWrappedArrayBuffer(data);
     }
   }
 };
@@ -6269,6 +6313,7 @@ export {
   AudioDataSource,
   AudioSource,
   BlobSource,
+  CanvasDrain,
   CanvasSource,
   EncodedAudioChunkDrain,
   EncodedAudioChunkSource,
diff --git a/src/index.ts b/src/index.ts
index bf59d2d..38f6b41 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -42,6 +42,7 @@ export {
 	EncodedVideoChunkDrain,
 	VideoFrameDrain,
 	EncodedAudioChunkDrain,
+	CanvasDrain,
 	AudioDataDrain,
 	AudioBufferDrain,
 } from './media-drain';
diff --git a/src/input-track.ts b/src/input-track.ts
index 84799c6..06c6361 100644
--- a/src/input-track.ts
+++ b/src/input-track.ts
@@ -75,6 +75,16 @@ export class InputVideoTrack extends InputTrack {
 		return this._backing.getRotation();
 	}
 
+	async getRotatedWidth() {
+		const rotation = await this._backing.getRotation();
+		return rotation % 180 === 0 ? this._backing.getWidth() : this._backing.getHeight();
+	}
+
+	async getRotatedHeight() {
+		const rotation = await this._backing.getRotation();
+		return rotation % 180 === 0 ? this._backing.getHeight() : this._backing.getWidth();
+	}
+
 	getDecoderConfig() {
 		return this._backing.getDecoderConfig();
 	}
diff --git a/src/media-drain.ts b/src/media-drain.ts
index 2f8cddd..73b2f90 100644
--- a/src/media-drain.ts
+++ b/src/media-drain.ts
@@ -333,6 +333,61 @@ export class VideoFrameDrain extends BaseMediaFrameDrain<EncodedVideoChunk, Vide
 	}
 }
 
+type WrappedCanvas = {
+	canvas: HTMLCanvasElement;
+	timestamp: number;
+	duration: number;
+};
+
+export class CanvasDrain {
+	videoFrameDrain: VideoFrameDrain;
+
+	constructor(public videoTrack: InputVideoTrack, public dimensions?: { width: number; height: number }) {
+		this.videoFrameDrain = new VideoFrameDrain(videoTrack);
+	}
+
+	private async videoFrameToWrappedCanvas(frame: VideoFrame): Promise<WrappedCanvas> {
+		const width = this.dimensions?.width ?? await this.videoTrack.getRotatedWidth();
+		const height = this.dimensions?.height ?? await this.videoTrack.getRotatedHeight();
+		const rotation = await this.videoTrack.getRotation();
+
+		const canvas = document.createElement('canvas');
+		canvas.width = width;
+		canvas.height = height;
+
+		const context = canvas.getContext('2d', { alpha: false });
+		assert(context);
+
+		context.translate(width / 2, height / 2);
+		context.rotate(rotation * Math.PI / 180);
+		context.translate(-width / 2, -height / 2);
+
+		const [imageWidth, imageHeight] = rotation % 180 === 0 ? [width, height] : [height, width];
+
+		context.drawImage(frame, (width - imageWidth) / 2, (height - imageHeight) / 2, imageWidth, imageHeight);
+
+		const result = {
+			canvas,
+			timestamp: frame.timestamp / 1e6,
+			duration: (frame.duration ?? 0) / 1e6,
+		};
+
+		frame.close();
+		return result;
+	}
+
+	async getCanvas(timestamp: number) {
+		const frame = await this.videoFrameDrain.getFrame(timestamp);
+		return frame && this.videoFrameToWrappedCanvas(frame);
+	}
+
+	async* canvases(startTimestamp = 0, endTimestamp = Infinity) {
+		for await (const frame of this.videoFrameDrain.frames(startTimestamp, endTimestamp)) {
+			yield this.videoFrameToWrappedCanvas(frame);
+		}
+	}
+}
+
 export class EncodedAudioChunkDrain extends BaseChunkDrain<EncodedAudioChunk> {
 	constructor(public audioTrack: InputAudioTrack) {
 		super();
@@ -407,11 +462,7 @@ export class AudioBufferDrain {
 		this.audioDataDrain = new AudioDataDrain(audioTrack);
 	}
 
-	private audioDataToWrappedArrayBuffer(data: AudioData | null): WrappedAudioBuffer | null {
-		if (!data) {
-			return null;
-		}
-
+	private audioDataToWrappedArrayBuffer(data: AudioData): WrappedAudioBuffer {
 		const audioBuffer = new AudioBuffer({
 			numberOfChannels: data.numberOfChannels,
 			length: data.numberOfFrames,
@@ -428,24 +479,24 @@ export class AudioBufferDrain {
 
 		const sampleDuration = 1 / data.sampleRate;
 
-		return {
+		const result = {
 			buffer: audioBuffer,
 			// Rounding the timestamp based on the sample duration removes audio playback artifacts
 			timestamp: Math.round(data.timestamp / 1e6 / sampleDuration) * sampleDuration,
 		};
+
+		data.close();
+		return result;
 	}
 
 	async getBuffer(timestamp: number) {
 		const data = await this.audioDataDrain.getData(timestamp);
-		return this.audioDataToWrappedArrayBuffer(data);
+		return data && 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;
+			yield this.audioDataToWrappedArrayBuffer(data);
 		}
 	}
 }