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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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docs/guide/supported-formats-and-codecs.md
+7 -2
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@@ -40,6 +40,8 @@ Mediabunny ships with built-in decoders and encoders for all audio PCM codecs, m
- `'mp3'` - MP3
- `'vorbis'` - Vorbis
- `'flac'` - Free Lossless Audio Codec (FLAC)
- `'ac3'` - Dolby Digital (AC-3)
- `'eac3'` - Dolby Digital Plus (E-AC-3)
- `'pcm-u8'` - 8-bit unsigned PCM
- `'pcm-s8'` - 8-bit signed PCM
- `'pcm-s16'` - 16-bit little-endian signed PCM
@@ -75,6 +77,8 @@ Not all codecs can be used with all containers. The following table specifies th
| `'mp3'` | ✓ | ✓ | ✓ | | | ✓ | | | | ✓ |
| `'vorbis'` | ✓ | ✓ | ✓ | ✓ | ✓ | | | | | |
| `'flac'` | ✓ | ✓ | ✓ | | | | | | ✓ | |
| `'ac3'`[^2] | ✓ | ✓ | ✓ | | | | | | | ✓ |
| `'eac3'`[^2] | ✓ | ✓ | ✓ | | | | | | | ✓ |
| `'pcm-u8'` | | ✓ | ✓ | | | | ✓ | | | |
| `'pcm-s8'` | | ✓ | | | | | | | | |
| `'pcm-s16'` | ✓ | ✓ | ✓ | | | | ✓ | | | |
@@ -89,11 +93,12 @@ Not all codecs can be used with all containers. The following table specifies th
| `'pcm-f64be'` | ✓ | ✓ | | | | | | | | |
| `'ulaw'` | | ✓ | | | | | ✓ | | | |
| `'alaw'` | | ✓ | | | | | ✓ | | | |
| `'webvtt'`[^2] | (✓) | | (✓) | (✓) | | | | | | |
| `'webvtt'`[^3] | (✓) | | (✓) | (✓) | | | | | | |
[^1]: WebM only supports a small subset of the codecs supported by Matroska. However, this library can technically read all codecs from a WebM that are supported by Matroska.
[^2]: WebVTT can only be written, not read.
[^2]: AC-3 and E-AC-3 are not natively supported by WebCodecs. To encode or decode these codecs, you must provide a [custom coder](#custom-coders).
[^3]: WebVTT can only be written, not read.
## Querying codec encodability