v0.4.0 - MP4/M4A Support
MP4/M4A Format Support
This release adds full read/write support for MP4/M4A audio files (AAC, ALAC) with iTunes-style metadata.
Highlights
- Full MP4/M4A support - ISO 14496-12/14 compliant box parsing
- iTunes metadata - All standard atoms (©nam, ©ART, ©alb, trkn, disk, covr, etc.)
- Audio properties - Duration, sample rate, bitrate, channels, codec detection
- Album art - JPEG/PNG cover art via covr atom
- MusicBrainz IDs - Full support via freeform atoms
- ReplayGain/R128 - Track and album gain values
- MediaFile factory - Auto-detection of MP4 format
- Atomic writes - Safe file saving with mdat relocation
Audio Codec Support
- AAC (via esds parsing)
- ALAC (via magic cookie parsing)
- Detection for FLAC, Opus, AC-3, E-AC-3 in MP4 container
Metadata Atoms
| Category | Atoms |
|---|---|
| Basic | Title, Artist, Album, Genre, Year, Comment, Composer |
| Album | Album Artist, Track/Disc Numbers, Compilation, Gapless |
| Sort | AlbumSort, ArtistSort, TitleSort, ComposerSort |
| Classical | Work, Movement Name/Number/Count, Show Movement |
| Freeform | MusicBrainz IDs, AcoustID, ReplayGain, R128, ISRC |
Statistics
- 197 new MP4 tests
- 2,318 total tests passing
- 88.67% code coverage
See CHANGELOG.md for full details.