arcodange/mediabunny
1
0
Fork 0
mirror of https://github.com/arcodange-org/mediabunny.git synced 2026-10-03 13:53:53 +02:00
Code Issues Packages Projects Releases Wiki Activity

Add setting track language code, add proper AV1 CodecPrivate for Matroska muxer

Browse Source
This commit is contained in:
Vanilagy
2025-01-15 20:00:29 +01:00
parent 9af3e6eb66
commit 2bec661985
7 changed files with 120 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/isobmff/isobmff-boxes.ts
+17 -41
View File
@@ -12,7 +12,15 @@ import {
IDENTITY_MATRIX,
rotationMatrix,
} from '../misc';
import { AudioCodec, parsePcmCodec, PCM_CODECS, PcmAudioCodec, SubtitleCodec, VideoCodec } from '../codec';
import {
AudioCodec,
generateAv1CodecConfigurationFromCodecString,
parsePcmCodec,
PCM_CODECS,
PcmAudioCodec,
SubtitleCodec,
VideoCodec,
} from '../codec';
import { formatSubtitleTimestamp } from '../subtitles';
import { Writer } from '../writer';
import {
@@ -420,12 +428,18 @@ export const mdhd = (
const needsU64 = !isU32(creationTime) || !isU32(localDuration);
const u32OrU64 = needsU64 ? u64 : u32;
let language = 0;
for (const character of (trackData.track.metadata.languageCode ?? 'und')) {
language <<= 5;
language += character.charCodeAt(0) - 0x60;
}
return fullBox('mdhd', +needsU64, 0, [
u32OrU64(creationTime), // Creation time
u32OrU64(creationTime), // Modification time
u32(trackData.timescale), // Timescale
u32OrU64(localDuration), // Duration
u16(0b01010101_11000100), // Language ("und", undetermined)
u16(language), // Language
u16(0), // Quality
]);
};
@@ -653,45 +667,7 @@ export const vpcC = (trackData: IsobmffVideoTrackData) => {
/** AV1 Configuration Box: Provides additional information to the decoder. */
export const av1C = (trackData: IsobmffVideoTrackData) => {
// Reference: https://aomediacodec.github.io/av1-isobmff/
const decoderConfig = trackData.info.decoderConfig;
const parts = decoderConfig.codec.split('.'); // We can derive the required values from the codec string
const marker = 1;
const version = 1;
const firstByte = (marker << 7) + version;
const profile = Number(parts[1]);
const levelAndTier = parts[2]!;
const level = Number(levelAndTier.slice(0, -1));
const secondByte = (profile << 5) + level;
const tier = levelAndTier.slice(-1) === 'H' ? 1 : 0;
const bitDepth = Number(parts[3]);
const highBitDepth = bitDepth === 8 ? 0 : 1;
const twelveBit = 0;
const monochrome = parts[4] ? Number(parts[4]) : 0;
const chromaSubsamplingX = parts[5] ? Number(parts[5][0]) : 1;
const chromaSubsamplingY = parts[5] ? Number(parts[5][1]) : 1;
const chromaSamplePosition = parts[5] ? Number(parts[5][2]) : 0; // CSP_UNKNOWN
const thirdByte = (tier << 7)
+ (highBitDepth << 6)
+ (twelveBit << 5)
+ (monochrome << 4)
+ (chromaSubsamplingX << 3)
+ (chromaSubsamplingY << 2)
+ chromaSamplePosition;
const initialPresentationDelayPresent = 0; // Should be fine
const fourthByte = initialPresentationDelayPresent;
return box('av1C', [
firstByte,
secondByte,
thirdByte,
fourthByte,
]);
return box('av1C', generateAv1CodecConfigurationFromCodecString(trackData.info.decoderConfig.codec));
};
/** Sound Sample Description Box: Contains information that defines how to interpret sound media data. */