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Add support for PCM codecs in MP4, add 64-bit float PCM support

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Vanilagy
2025-06-16 10:49:55 +02:00
parent 0ca1425036
commit 05881ff1f5
12 changed files with 254 additions and 64 deletions
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docs/guide/supported-formats-and-codecs.md
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@@ -47,6 +47,8 @@ Mediakit ships with built-in decoders and encoders for all audio PCM codecs, mea
- `'pcm-s32be'` - 32-bit big-endian signed PCM
- `'pcm-f32'` - 32-bit little-endian float PCM
- `'pcm-f32be'` - 32-bit big-endian float PCM
- `'pcm-f64'` - 64-bit little-endian float PCM
- `'pcm-f64be'` - 64-bit big-endian float PCM
- `'ulaw'` - μ-law PCM
- `'alaw'` - A-law PCM
@@ -58,7 +60,7 @@ Mediakit ships with built-in decoders and encoders for all audio PCM codecs, mea
Not all codecs can be used with all containers. The following table specifies the supported codec-container combinations:
| | .mp4[^1] | .mov | .mkv | .webm[^2] | .ogg | .mp3 | .wav |
| | .mp4 | .mov | .mkv | .webm[^1] | .ogg | .mp3 | .wav |
|:--------------:|:--------:|:-----:|:-----:|:---------:|:-----:|:-----:|:-----:|
| `'avc'` | ✓ | ✓ | ✓ | | | | |
| `'hevc'` | ✓ | ✓ | ✓ | | | | |
@@ -72,22 +74,23 @@ Not all codecs can be used with all containers. The following table specifies th
| `'flac'` | ✓ | ✓ | ✓ | | | | |
| `'pcm-u8'` | | ✓ | ✓ | | | | ✓ |
| `'pcm-s8'` | | ✓ | | | | | |
| `'pcm-s16'` | | ✓ | ✓ | | | | ✓ |
| `'pcm-s16be'` | | ✓ | ✓ | | | | |
| `'pcm-s24'` | | ✓ | ✓ | | | | ✓ |
| `'pcm-s24be'` | | ✓ | ✓ | | | | |
| `'pcm-s32'` | | ✓ | ✓ | | | | ✓ |
| `'pcm-s32be'` | | ✓ | ✓ | | | | |
| `'pcm-f32'` | | ✓ | ✓ | | | | ✓ |
| `'pcm-f32be'` | | ✓ | | | | | |
| `'pcm-s16'` | ✓ | ✓ | ✓ | | | | ✓ |
| `'pcm-s16be'` | ✓ | ✓ | ✓ | | | | |
| `'pcm-s24'` | ✓ | ✓ | ✓ | | | | ✓ |
| `'pcm-s24be'` | ✓ | ✓ | ✓ | | | | |
| `'pcm-s32'` | ✓ | ✓ | ✓ | | | | ✓ |
| `'pcm-s32be'` | ✓ | ✓ | ✓ | | | | |
| `'pcm-f32'` | ✓ | ✓ | ✓ | | | | ✓ |
| `'pcm-f32be'` | ✓ | ✓ | | | | | |
| `'pcm-f64'` | ✓ | ✓ | ✓ | | | | |
| `'pcm-f64be'` | ✓ | ✓ | | | | | |
| `'ulaw'` | | ✓ | | | | | ✓ |
| `'alaw'` | | ✓ | | | | | ✓ |
| `'webvtt'`[^3] | (✓) | | (✓) | (✓) | | | |
| `'webvtt'`[^2] | (✓) | | (✓) | (✓) | | | |
[^1]: PCM audio codecs are not supported by MP4. However, if PCM audio is included in an MP4 nonetheless, this library would still be able to read it.
[^2]: 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.
[^3]: WebVTT can only be written, not read.
[^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.
## Querying codec encodability