Expand backend lyrics support with richer sidecar formats and upgrade the
OpenSubsonic songLyrics implementation to the version 2 structured karaoke
contract, while preserving version 1 behavior by default.
Sidecar formats and parsing:
- Add a TTML parser (core/lyrics/ttml.go): clock time, offset time, bare
decimal seconds, nested timing contexts, and token-level <span> timing for
word/syllable karaoke. Parses Apple Music-style metadata tracks (translation
and pronunciation/transliteration) and agent metadata into per-track agents[]
plus per-cue-line agentId. Hydrates missing line timing from cue timing.
- Add an SRT parser (core/lyrics/srt.go).
- Add a LRCLIB Lyricsfile (.yaml/.yml) parser (model/lyricsfile.go): maps
per-word lines[].words[] to cues with inclusive UTF-8 byte offsets and
attributes overlapping lines to synthetic voice agents so parallel vocals
split correctly in the enhanced response.
- Extend LRC parsing for Enhanced LRC inline <mm:ss.xx> word-timing markers.
- Add UTF-8 BOM and UTF-16 LE support for TTML/LRC sidecars.
- Parse the above formats from embedded tags as well as sidecar files.
Source resolution:
- Default lyricspriority is now
".ttml,.yaml,.yml,.elrc,.lrc,.srt,.txt,embedded" so the new formats are
discoverable without manual configuration.
- Preserve configured source priority across duplicate media-file candidates
instead of only checking the first DB match, so higher-priority sidecar
lyrics on older duplicates can still win.
- Raise the embedded-lyrics tag maxLength to 1 MB to fit word-timed
TTML/Enhanced-LRC karaoke for a full song.
OpenSubsonic songLyrics v2:
- Advertise songLyrics versions [1, 2].
- With enhanced=true, getLyricsBySongId may return structuredLyrics.kind
(main/translation/pronunciation), cueLine[] line-level karaoke groupings,
cueLine.cue[] timed words/syllables with required UTF-8 byteStart/byteEnd,
reusable structuredLyrics.agents[], and cueLine.agentId references.
- Without enhanced=true, the response stays v1-compatible: no kind, no cueLine,
no agents, no non-main tracks; the existing line[] payload is always
populated so legacy clients keep working.
Contract details:
- cueLine is emitted only for synced lyrics with cue data.
- Within a cueLine, cue.end is normalized all-or-none and overlaps are removed;
overlaps across separate cueLines remain valid for parallel vocal layers.
- Missing cue end-times are filled from the next cue or the parent line.
- When cueLines share an index, the one whose agent has role "main" is first.
- LyricCue.Value is serialized as XML chardata; cues with nil start are skipped
rather than serialized as 0.
Refactoring:
- Move pure format parsers into model/ (lyrics.go, lyrics_ttml.go,
lyrics_srt.go, lyrics_embedded.go, lyricsfile.go) and extract Subsonic
response building into server/subsonic/lyrics.go.
- Centralize lyric-kind constants and add Lyrics.EffectiveKind/IsMainKind.
- Add gg.Clone helper.
Spec references:
https://github.com/opensubsonic/open-subsonic-api/discussions/213https://github.com/opensubsonic/open-subsonic-api/pull/218 (songLyrics v2)
https://github.com/opensubsonic/open-subsonic-api/pull/228 (cue byte offsets)
* feat(plugins): add lyrics provider plugin capability
Refactor the lyrics system from a static function to an interface-based
service that supports WASM plugin providers. Plugins listed in the
LyricsPriority config (alongside "embedded" and file extensions) are
now resolved through the plugin system.
Includes capability definition, Go/Rust PDK, adapter, Wire integration,
and tests for plugin fallback behavior.
* test(plugins): add lyrics capability integration test with test plugin
* fix(plugins): default lyrics language to 'xxx' when plugin omits it
Per the OpenSubsonic spec, the server must return 'und' or 'xxx' when
the lyrics language is unknown. The lyrics plugin adapter was passing
an empty string through when a plugin didn't provide a language value.
This defaults the language to 'xxx', consistent with all other callers
of model.ToLyrics() in the codebase.
* refactor(plugins): rename lyrics import to improve clarity
Signed-off-by: Deluan <deluan@navidrome.org>
* refactor(lyrics): update TrackInfo description for clarity
Signed-off-by: Deluan <deluan@navidrome.org>
* fix(lyrics): enhance lyrics plugin handling and case sensitivity
Signed-off-by: Deluan <deluan@navidrome.org>
* fix(plugins): update payload type to string with byte format for task data
Signed-off-by: Deluan <deluan@navidrome.org>
---------
Signed-off-by: Deluan <deluan@navidrome.org>
