91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
package ffmpeg
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import (
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"context"
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"mime"
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"strings"
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"github.com/go-flac/flacpicture"
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"github.com/go-flac/flacvorbis"
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"github.com/go-flac/go-flac"
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"golang.org/x/exp/slices"
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)
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func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams) error {
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f, err := flac.ParseFile(m.Audio)
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if err != nil {
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return err
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}
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// generate comment block
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comment := flacvorbis.MetaDataBlockVorbisComment{Vendor: "unlock-music.dev"}
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// add metadata
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title := m.Meta.GetTitle()
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if title != "" {
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_ = comment.Add(flacvorbis.FIELD_TITLE, title)
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}
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album := m.Meta.GetAlbum()
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if album != "" {
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_ = comment.Add(flacvorbis.FIELD_ALBUM, album)
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}
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artists := m.Meta.GetArtists()
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for _, artist := range artists {
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_ = comment.Add(flacvorbis.FIELD_ARTIST, artist)
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}
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existCommentIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
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return b.Type == flac.VorbisComment
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})
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if existCommentIdx >= 0 { // copy existing comment fields
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exist, err := flacvorbis.ParseFromMetaDataBlock(*f.Meta[existCommentIdx])
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if err != nil {
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for _, s := range exist.Comments {
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if strings.HasPrefix(s, flacvorbis.FIELD_TITLE+"=") && title != "" ||
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strings.HasPrefix(s, flacvorbis.FIELD_ALBUM+"=") && album != "" ||
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strings.HasPrefix(s, flacvorbis.FIELD_ARTIST+"=") && len(artists) != 0 {
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continue
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}
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comment.Comments = append(comment.Comments, s)
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}
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}
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}
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// add / replace flac comment
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cmtBlock := comment.Marshal()
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if existCommentIdx < 0 {
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f.Meta = append(f.Meta, &cmtBlock)
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} else {
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f.Meta[existCommentIdx] = &cmtBlock
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}
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if m.AlbumArt != nil {
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cover, err := flacpicture.NewFromImageData(
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flacpicture.PictureTypeFrontCover,
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"Front cover",
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m.AlbumArt,
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mime.TypeByExtension(m.AlbumArtExt),
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)
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if err != nil {
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return err
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}
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coverBlock := cover.Marshal()
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f.Meta = append(f.Meta, &coverBlock)
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// add / replace flac cover
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coverIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
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return b.Type == flac.Picture
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})
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if coverIdx < 0 {
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f.Meta = append(f.Meta, &coverBlock)
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} else {
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f.Meta[coverIdx] = &coverBlock
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}
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}
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return f.Save(outPath)
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}
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