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feat(codec): add detection support for AC-3, E-AC-3 audio codecs (#275)

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* ac3/eac3 detection

* fix tests

* review pass + follow codebase comments style

* Add ac3/eac3 to docs

* WIP mpeg-2

* Set registration_descriptor

* add support for ac3 system b in mpeg-ts

* Update docs with ac3 in .ts support

* fix formatting

* Remove default to fix linter

* Add eac3 to mpeg-ts

* fix formatting

* Fix failing test

* Refactor AC3/EAC3 code a little

---------

Co-authored-by: Vanilagy <[email protected]>
This commit is contained in:
jepcd
2026-02-11 15:23:12 +01:00
committed by GitHub
co-authored by Vanilagy
parent 612642c5ad
commit 417c85d8ed
24 changed files with 1061 additions and 16 deletions
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src/codec.ts
+29 -1
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@@ -70,6 +70,8 @@ export const NON_PCM_AUDIO_CODECS = [
'mp3',
'vorbis',
'flac',
'ac3',
'eac3',
] as const;
/**
* List of known audio codecs, ordered by encoding preference.
@@ -528,6 +530,10 @@ export const buildAudioCodecString = (codec: AudioCodec, numberOfChannels: numbe
return 'vorbis';
} else if (codec === 'flac') {
return 'flac';
} else if (codec === 'ac3') {
return 'ac-3';
} else if (codec === 'eac3') {
return 'ec-3';
} else if ((PCM_AUDIO_CODECS as readonly string[]).includes(codec)) {
return codec;
}
@@ -573,6 +579,10 @@ export const extractAudioCodecString = (trackInfo: {
return 'vorbis';
} else if (codec === 'flac') {
return 'flac';
} else if (codec === 'ac3') {
return 'ac-3';
} else if (codec === 'eac3') {
return 'ec-3';
} else if (codec && (PCM_AUDIO_CODECS as readonly string[]).includes(codec)) {
return codec;
}
@@ -742,6 +752,10 @@ export const inferCodecFromCodecString = (codecString: string): MediaCodec | nul
return 'vorbis';
} else if (codecString === 'flac') {
return 'flac';
} else if (codecString === 'ac-3' || codecString === 'ac3') {
return 'ac3';
} else if (codecString === 'ec-3' || codecString === 'eac3') {
return 'eac3';
} else if (codecString === 'ulaw') {
return 'ulaw';
} else if (codecString === 'alaw') {
@@ -933,7 +947,9 @@ export const validateVideoChunkMetadata = (metadata: EncodedVideoChunkMetadata |
}
};
const VALID_AUDIO_CODEC_STRING_PREFIXES = ['mp4a', 'mp3', 'opus', 'vorbis', 'flac', 'ulaw', 'alaw', 'pcm'];
const VALID_AUDIO_CODEC_STRING_PREFIXES = [
'mp4a', 'mp3', 'opus', 'vorbis', 'flac', 'ulaw', 'alaw', 'pcm', 'ac-3', 'ec-3',
];
export const validateAudioChunkMetadata = (metadata: EncodedAudioChunkMetadata | undefined) => {
if (!metadata) {
@@ -1051,6 +1067,18 @@ export const validateAudioChunkMetadata = (metadata: EncodedAudioChunkMetadata |
+ ' adhere to the format described in https://www.w3.org/TR/webcodecs-flac-codec-registration/.',
);
}
} else if (metadata.decoderConfig.codec.startsWith('ac-3') || metadata.decoderConfig.codec.startsWith('ac3')) {
// AC3-specific validation
if (metadata.decoderConfig.codec !== 'ac-3') {
throw new TypeError('Audio chunk metadata decoder configuration codec string for AC-3 must be "ac-3".');
}
} else if (metadata.decoderConfig.codec.startsWith('ec-3') || metadata.decoderConfig.codec.startsWith('eac3')) {
// EAC3-specific validation
if (metadata.decoderConfig.codec !== 'ec-3') {
throw new TypeError('Audio chunk metadata decoder configuration codec string for EC-3 must be "ec-3".');
}
} else if (
metadata.decoderConfig.codec.startsWith('pcm')
|| metadata.decoderConfig.codec.startsWith('ulaw')