trimmed down metadata & own extractor for vobis(flac)

internal/metadata/metadata.go

@@ -11,18 +11,27 @@ import (
 )
 
 type Metadata struct {
-	Title       string
+	Title       *string
 	Artist      []string
-	Album       string
+	Album       *string
 	AlbumArtist []string
 	Track       int
 	TotalTracks int
-	Disc        int
-	TotalDiscs  int
-	Comment     string
+	Comment     *string
 }
 
 func ReadAudioTags(filePath string) (*Metadata, error) {
+	ext := strings.ToLower(filepath.Ext(filePath))
+
+	switch {
+	case ext == ".flac":
+		return readVorbisMetadata(filePath)
+	default:
+		return readGenericAudioTags(filePath)
+	}
+}
+
+func readGenericAudioTags(filePath string) (*Metadata, error) {
 	f, err := os.Open(filePath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open file: %w", err)
@@ -35,18 +44,19 @@ func ReadAudioTags(filePath string) (*Metadata, error) {
 	}
 
 	track, totalTracks := m.Track()
-	disc, totalDiscs := m.Disc()
+
+	title := m.Title()
+	album := m.Album()
+	comment := m.Comment()
 
 	info := &Metadata{
-		Title:       m.Title(),
+		Title:       &title,
 		Artist:      parseSeperatedTag(m.Artist()),
-		Album:       m.Album(),
+		Album:       &album,
 		AlbumArtist: parseSeperatedTag(m.AlbumArtist()),
 		Track:       track,
 		TotalTracks: totalTracks,
-		Disc:        disc,
-		TotalDiscs:  totalDiscs,
-		Comment:     m.Comment(),
+		Comment:     &comment,
 	}
 
 	return info, nil