Add OS Lyrics extension (#2656)

* draft commit

* time to fight pipeline

* round 2 changes

* remove unnecessary line

* fight taglib. again

* make taglib work again???

* add id3 tags

* taglib 1.12 vs 1.13

* use int instead for windows

* store as json now

* add migration, more tests

* support repeated line, multiline

* fix ms and support .m, .mm, .mmm

* address some concerns, make cpp a bit safer

* separate responses from model

* remove [:]

* Add trace log

* Try to unblock pipeline

* Fix merge errors

* Fix SIGSEGV error (proper handling of empty frames)

* Add fallback artist/title to structured lyrics

* Rename conflicting named vars

* Fix tests

* Do we still need ffmpeg in the pipeline?

* Revert "Do we still need ffmpeg in the pipeline?"

Yes we do.

This reverts commit 87df7f6df79bccee83f48c4b7a8118a7636a5e66.

* Does this passes now, with a newer ffmpeg version?

* Revert "Does this passes now, with a newer ffmpeg version?"

No, it does not :(

This reverts commit 372eb4b0ae05d9ffe98078e9bc4e56a9b2921f32.

* My OCD made me do it :P

---------

Co-authored-by: Deluan Quintão <deluan@navidrome.org>

model/mediafile.go

@@ -1,6 +1,7 @@
 package model
 
 import (
+	"encoding/json"
 	"mime"
 	"path/filepath"
 	"sort"
@@ -56,7 +57,7 @@ type MediaFile struct {
 	OrderAlbumArtistName string  `structs:"order_album_artist_name" json:"orderAlbumArtistName"`
 	Compilation          bool    `structs:"compilation" json:"compilation"`
 	Comment              string  `structs:"comment" json:"comment,omitempty"`
-	Lyrics               string  `structs:"lyrics" json:"lyrics,omitempty"`
+	Lyrics               string  `structs:"lyrics" json:"lyrics"`
 	Bpm                  int     `structs:"bpm" json:"bpm,omitempty"`
 	CatalogNum           string  `structs:"catalog_num" json:"catalogNum,omitempty"`
 	MbzRecordingID       string  `structs:"mbz_recording_id" json:"mbzRecordingID,omitempty"`
@@ -92,6 +93,15 @@ func (mf MediaFile) AlbumCoverArtID() ArtworkID {
 	return artworkIDFromAlbum(Album{ID: mf.AlbumID})
 }
 
+func (mf MediaFile) StructuredLyrics() (LyricList, error) {
+	lyrics := LyricList{}
+	err := json.Unmarshal([]byte(mf.Lyrics), &lyrics)
+	if err != nil {
+		return nil, err
+	}
+	return lyrics, nil
+}
+
 type MediaFiles []MediaFile
 
 // Dirs returns a deduped list of all directories from the MediaFiles' paths