algo/common/dispatch.go

@@ -29,6 +29,7 @@ func RegisterDecoder(ext string, noop bool, dispatchFunc NewDecoderFunc) {
 	DecoderRegistry[ext] = append(DecoderRegistry[ext],
 		decoderItem{noop: noop, decoder: dispatchFunc})
 }
+
 func GetDecoder(filename string, skipNoop bool) (rs []NewDecoderFunc) {
 	ext := strings.ToLower(strings.TrimLeft(filepath.Ext(filename), "."))
 	for _, dec := range DecoderRegistry[ext] {

algo/common/interface.go

@@ -5,6 +5,10 @@ import (
 	"io"
 )
 
+type StreamDecoder interface {
+	Decrypt(buf []byte, offset int)
+}
+
 type Decoder interface {
 	Validate() error
 	io.Reader
@@ -14,12 +18,12 @@ type CoverImageGetter interface {
 	GetCoverImage(ctx context.Context) ([]byte, error)
 }
 
-type Meta interface {
+type AudioMeta interface {
 	GetArtists() []string
 	GetTitle() string
 	GetAlbum() string
 }
 
-type StreamDecoder interface {
+type AudioMetaGetter interface {
-	Decrypt(buf []byte, offset int)
+	GetAudioMeta(ctx context.Context) (AudioMeta, error)
 }

algo/ncm/meta.go

@@ -6,12 +6,17 @@ import (
 	"unlock-music.dev/cli/algo/common"
 )
 
-type RawMeta interface {
+type ncmMeta interface {
-	common.Meta
+	common.AudioMeta
+
+	// GetFormat return the audio format, e.g. mp3, flac
 	GetFormat() string
+
+	// GetAlbumImageURL return the album image url
 	GetAlbumImageURL() string
 }
-type RawMetaMusic struct {
+
+type ncmMetaMusic struct {
 	Format        string          `json:"format"`
 	MusicID       int             `json:"musicId"`
 	MusicName     string          `json:"musicName"`
@@ -28,10 +33,11 @@ type RawMetaMusic struct {
 	TransNames    []interface{}   `json:"transNames"`
 }
 
-func (m RawMetaMusic) GetAlbumImageURL() string {
+func (m *ncmMetaMusic) GetAlbumImageURL() string {
 	return m.AlbumPic
 }
-func (m RawMetaMusic) GetArtists() (artists []string) {
+
+func (m *ncmMetaMusic) GetArtists() (artists []string) {
 	for _, artist := range m.Artist {
 		for _, item := range artist {
 			name, ok := item.(string)
@@ -43,22 +49,23 @@ func (m RawMetaMusic) GetArtists() (artists []string) {
 	return
 }
 
-func (m RawMetaMusic) GetTitle() string {
+func (m *ncmMetaMusic) GetTitle() string {
 	return m.MusicName
 }
 
-func (m RawMetaMusic) GetAlbum() string {
+func (m *ncmMetaMusic) GetAlbum() string {
 	return m.Album
 }
-func (m RawMetaMusic) GetFormat() string {
+
+func (m *ncmMetaMusic) GetFormat() string {
 	return m.Format
 }
 
 //goland:noinspection SpellCheckingInspection
-type RawMetaDJ struct {
+type ncmMetaDJ struct {
 	ProgramID          int          `json:"programId"`
 	ProgramName        string       `json:"programName"`
-	MainMusic          RawMetaMusic `json:"mainMusic"`
+	MainMusic          ncmMetaMusic `json:"mainMusic"`
 	DjID               int          `json:"djId"`
 	DjName             string       `json:"djName"`
 	DjAvatarURL        string       `json:"djAvatarUrl"`
@@ -80,32 +87,32 @@ type RawMetaDJ struct {
 	RadioPurchaseCount int          `json:"radioPurchaseCount"`
 }
 
-func (m RawMetaDJ) GetArtists() []string {
+func (m *ncmMetaDJ) GetArtists() []string {
 	if m.DjName != "" {
 		return []string{m.DjName}
 	}
 	return m.MainMusic.GetArtists()
 }
 
-func (m RawMetaDJ) GetTitle() string {
+func (m *ncmMetaDJ) GetTitle() string {
 	if m.ProgramName != "" {
 		return m.ProgramName
 	}
 	return m.MainMusic.GetTitle()
 }
 
-func (m RawMetaDJ) GetAlbum() string {
+func (m *ncmMetaDJ) GetAlbum() string {
 	if m.Brand != "" {
 		return m.Brand
 	}
 	return m.MainMusic.GetAlbum()
 }
 
-func (m RawMetaDJ) GetFormat() string {
+func (m *ncmMetaDJ) GetFormat() string {
 	return m.MainMusic.GetFormat()
 }
 
-func (m RawMetaDJ) GetAlbumImageURL() string {
+func (m *ncmMetaDJ) GetAlbumImageURL() string {
 	if strings.HasPrefix(m.MainMusic.GetAlbumImageURL(), "http") {
 		return m.MainMusic.GetAlbumImageURL()
 	}

algo/ncm/ncm.go

@@ -41,7 +41,7 @@ type Decoder struct {
 
 	metaRaw  []byte
 	metaType string
-	meta     RawMeta
+	meta     ncmMeta
 	cover    []byte
 }
 
@@ -172,10 +172,10 @@ func (d *Decoder) readCoverData() error {
 func (d *Decoder) parseMeta() error {
 	switch d.metaType {
 	case "music":
-		d.meta = new(RawMetaMusic)
+		d.meta = new(ncmMetaMusic)
 		return json.Unmarshal(d.metaRaw, d.meta)
 	case "dj":
-		d.meta = new(RawMetaDJ)
+		d.meta = new(ncmMetaDJ)
 		return json.Unmarshal(d.metaRaw, d.meta)
 	default:
 		return errors.New("unknown ncm meta type: " + d.metaType)
@@ -232,8 +232,8 @@ func (d *Decoder) GetCoverImage(ctx context.Context) ([]byte, error) {
 	return d.cover, nil
 }
 
-func (d *Decoder) GetMeta() common.Meta {
+func (d *Decoder) GetAudioMeta(_ context.Context) (common.AudioMeta, error) {
-	return d.meta
+	return d.meta, nil
 }
 
 func init() {

cmd/um/main.go

@@ -225,7 +225,22 @@ func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFu
 				logger.Warn("write cover image failed", zap.Error(err))
 			}
 		}
+	}
 
+	if audioMetaGetter, ok := dec.(common.AudioMetaGetter); ok {
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+
+		meta, err := audioMetaGetter.GetAudioMeta(ctx)
+		if err != nil {
+			logger.Warn("get audio meta failed", zap.Error(err))
+		} else {
+			logger.Info("audio metadata",
+				zap.String("title", meta.GetTitle()),
+				zap.Strings("artists", meta.GetArtists()),
+				zap.String("album", meta.GetAlbum()),
+			)
+		}
 	}
 
 	// if source file need to be removed