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Reading of genre from MP4 'gnre' atom #107

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Reading of genre from MP4 'gnre' atom #107

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b391bd2
Reading of genre from MP4 'gnre' atom
earthrot Jul 14, 2024
607a9e5
Update mp4.go
earthrot Jul 25, 2024
ecf39c2
Update mp4.go
dhowden Jul 30, 2024
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15 changes: 15 additions & 0 deletions mp4.go
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ var atoms = atomNames(map[string]string{
"aART": "album_artist",
"\xa9day": "year",
"\xa9nam": "title",
"gnre": "genreid",
"\xa9gen": "genre",
"trkn": "track",
"\xa9wrt": "composer",
Expand Down Expand Up @@ -183,6 +184,14 @@ func (m metadataMP4) readAtomData(r io.ReadSeeker, name string, size uint32, pro
return nil
}

if name == "gnre" {
if len(b) < 2 {
return fmt.Errorf("invalid encoding: expected at least %d bytes for genre id, got %d", 2, len(b))
}
m.data[name] = int(b[1])
return nil
}

if contentType == "implicit" {
if name == "covr" {
if bytes.HasPrefix(b, pngHeader) {
Expand Down Expand Up @@ -325,6 +334,12 @@ func (m metadataMP4) Composer() string {
}

func (m metadataMP4) Genre() string {
if g, ok := m.data["gnre"]; ok {
if gid, ok := g.(int); ok && gid > 0 && gid <= len(id3v1Genres) {
return id3v1Genres[gid-1]
}
}

return m.getString(atoms.Name("genre"))
}

Expand Down