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feat: add M4A metadata/cover embed support across all Flutter screens

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Add FFmpegService.embedMetadataToM4a() for writing tags and cover art
into M4A files via FFmpeg. Fix two bugs in the same function:
- Remove '-disposition:v:0 attached_pic' which is only valid for
  Matroska/WebM containers and causes FFmpeg to error on MP4/M4A
- Apply same fix to _convertToAlac which had the identical issue

Add M4A handling (isM4A branch) to all four embed call-sites:
track_metadata_screen (lyrics embed, re-enrich, edit metadata sheet,
format conversion), queue_tab, local_album_screen, and
downloaded_album_screen.

Add 'LYRICS'/'UNSYNCEDLYRICS' to _mapMetadataForTagEmbed so existing
lyrics survive a re-enrich cycle on M4A/MP3/Opus files.

Preserve existing lyrics before overwriting tags in the edit metadata
sheet (best-effort readFileMetadata before FFmpeg pass).

Extract mergePlatformMetadataForTagEmbed() into lyrics_metadata_helper
to deduplicate the identical metadata-mapping loops that existed in
queue_tab, local_album_screen, downloaded_album_screen, and
track_metadata_screen.

Wire ensureLyricsMetadataForConversion into the format conversion path
in track_metadata_screen so lyrics are carried through conversions.

Add ISRC and LABEL/ORGANIZATION mappings to _convertToM4aTags.
This commit is contained in:
zarzet
2026-03-22 23:01:32 +07:00
parent 4cf885a52e
commit 12be560cb8
6 changed files with 235 additions and 54 deletions
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lib/utils/lyrics_metadata_helper.dart
+35
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@@ -74,3 +74,38 @@ Future<void> ensureLyricsMetadataForConversion({
metadata['LYRICS'] = lyrics;
metadata['UNSYNCEDLYRICS'] = lyrics;
}
void mergePlatformMetadataForTagEmbed({
required Map<String, String> target,
required Map<String, dynamic> source,
}) {
void put(String key, dynamic value) {
final normalized = value?.toString().trim();
if (normalized == null || normalized.isEmpty) return;
target[key] = normalized;
}
put('TITLE', source['title']);
put('ARTIST', source['artist']);
put('ALBUM', source['album']);
put('ALBUMARTIST', source['album_artist']);
put('DATE', source['date']);
put('ISRC', source['isrc']);
put('GENRE', source['genre']);
put('ORGANIZATION', source['label']);
put('COPYRIGHT', source['copyright']);
put('COMPOSER', source['composer']);
put('COMMENT', source['comment']);
put('LYRICS', source['lyrics']);
put('UNSYNCEDLYRICS', source['lyrics']);
final trackNumber = source['track_number'];
if (trackNumber != null && trackNumber.toString() != '0') {
put('TRACKNUMBER', trackNumber);
}
final discNumber = source['disc_number'];
if (discNumber != null && discNumber.toString() != '0') {
put('DISCNUMBER', discNumber);
}
}