Merge branch 'master' into bitrate
This commit is contained in:
commit
7dd78e85ac
4
flac.go
4
flac.go
@ -288,6 +288,10 @@ func (m *metadataFLAC) Disc() (int, int) {
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return x, n
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}
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func (m *metadataFLAC) Lyrics() string {
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return m.c["lyrics"]
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}
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func (m *metadataFLAC) Picture() *Picture {
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return m.p
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}
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1
id3v1.go
1
id3v1.go
@ -134,3 +134,4 @@ func (m metadataID3v1) AlbumArtist() string { return "" }
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func (m metadataID3v1) Composer() string { return "" }
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func (metadataID3v1) Disc() (int, int) { return 0, 0 }
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func (m metadataID3v1) Picture() *Picture { return nil }
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func (m metadataID3v1) Lyrics() string { return "" }
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7
id3v2.go
7
id3v2.go
@ -218,6 +218,13 @@ func readID3v2Frames(r io.Reader, h *ID3v2Header) (map[string]interface{}, error
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}
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result[rawName] = txt
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case name == "COMM" || name == "USLT":
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t, err := readTextWithDescrFrame(b)
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if err != nil {
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return nil, err
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}
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result[rawName] = t
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case name == "APIC":
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p, err := readAPICFrame(b)
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if err != nil {
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@ -37,9 +37,15 @@ func decodeText(enc byte, b []byte) (string, error) {
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return decodeISO8859(b), nil
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case 1: // UTF-16 with byte order marker
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if len(b) == 1 {
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return "", nil
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}
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return decodeUTF16WithBOM(b)
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case 2: // UTF-16 without byte order (assuming BigEndian)
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if len(b) == 1 {
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return "", nil
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}
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return decodeUTF16(b, binary.BigEndian), nil
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case 3: // UTF-8
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@ -50,6 +56,17 @@ func decodeText(enc byte, b []byte) (string, error) {
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}
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}
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func encodingDelim(enc byte) ([]byte, error) {
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switch enc {
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case 0, 3: // see decodeText above
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return []byte{0}, nil
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case 1, 2: // see decodeText above
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return []byte{0, 0}, nil
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default:
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return nil, fmt.Errorf("invalid encoding byte %x", enc)
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}
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}
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func decodeISO8859(b []byte) string {
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r := make([]rune, len(b))
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for i, x := range b {
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@ -81,6 +98,54 @@ func decodeUTF16(b []byte, bo binary.ByteOrder) string {
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return string(utf16.Decode(s))
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}
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// Comm is a type used in COMM and USLT tag. It's a text with a description and
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// a specified language
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type Comm struct {
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Language string
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Description string
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Text string
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}
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// String returns a string representation of the underlying Comm instance.
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func (t Comm) String() string {
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return fmt.Sprintf("Text{Lang: '%v', Description: '%v', %v lines}",
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t.Language, t.Description, strings.Count(t.Text, "\n"))
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}
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// IDv2.{3,4}
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// -- Header
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// <Header for 'Unsynchronised lyrics/text transcription', ID: "USLT">
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// <Header for 'Comment', ID: "COMM">
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// -- readTextWithDescrFrame
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// Text encoding $xx
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// Language $xx xx xx
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// Content descriptor <text string according to encoding> $00 (00)
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// Lyrics/text <full text string according to encoding>
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func readTextWithDescrFrame(b []byte) (*Comm, error) {
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enc := b[0]
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delim, err := encodingDelim(enc)
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if err != nil {
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return nil, err
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}
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descTextSplit := bytes.SplitN(b[4:], delim, 2)
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desc, err := decodeText(enc, descTextSplit[0])
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if err != nil {
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return nil, fmt.Errorf("error decoding tag description text: %v", err)
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}
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text, err := decodeText(enc, descTextSplit[1])
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if err != nil {
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return nil, fmt.Errorf("error decoding tag text: %v", err)
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}
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return &Comm{
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Language: string(b[1:4]),
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Description: desc,
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Text: text,
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}, nil
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}
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var pictureTypes = map[byte]string{
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0x00: "Other",
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0x01: "32x32 pixels 'file icon' (PNG only)",
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@ -135,7 +200,12 @@ func readPICFrame(b []byte) (*Picture, error) {
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ext := string(b[1:4])
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picType := b[4]
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descDataSplit := bytes.SplitN(b[5:], []byte{0}, 2)
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delim, err := encodingDelim(enc)
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if err != nil {
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return nil, err
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}
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descDataSplit := bytes.SplitN(b[5:], delim, 2)
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desc, err := decodeText(enc, descDataSplit[0])
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if err != nil {
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return nil, fmt.Errorf("error decoding PIC description text: %v", err)
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@ -175,7 +245,12 @@ func readAPICFrame(b []byte) (*Picture, error) {
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b = mimeDataSplit[1]
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picType := b[0]
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descDataSplit := bytes.SplitN(b[1:], []byte{0}, 2)
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delim, err := encodingDelim(enc)
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if err != nil {
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return nil, err
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}
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descDataSplit := bytes.SplitN(b[1:], delim, 2)
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desc, err := decodeText(enc, descDataSplit[0])
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if err != nil {
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return nil, fmt.Errorf("error decoding APIC description text: %v", err)
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@ -37,6 +37,7 @@ var frames = frameNames(map[string][2]string{
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"disc": [2]string{"TPA", "TPOS"},
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"genre": [2]string{"TCO", "TCON"},
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"picture": [2]string{"PIC", "APIC"},
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"lyrics": [2]string{"", "USLT"},
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})
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// metadataID3v2 is the implementation of Metadata used for ID3v2 tags.
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@ -112,6 +113,14 @@ func (m metadataID3v2) Disc() (int, int) {
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return parseXofN(m.getString(frames.Name("disc", m.Format())))
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}
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func (m metadataID3v2) Lyrics() string {
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t, ok := m.frames[frames.Name("lyrics", m.Format())]
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if !ok {
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return ""
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}
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return t.(*Comm).Text
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}
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func (m metadataID3v2) Picture() *Picture {
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v, ok := m.frames[frames.Name("picture", m.Format())]
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if !ok {
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8
mp4.go
8
mp4.go
@ -222,6 +222,14 @@ func (m metadataMP4) Disc() (int, int) {
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return x, 0
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}
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func (m metadataMP4) Lyrics() string {
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t, ok := m["\xa9lyr"]
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if !ok {
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return ""
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}
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return t.(string)
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}
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func (m metadataMP4) Picture() *Picture {
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v, ok := m["covr"]
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if !ok {
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5
tag.go
5
tag.go
@ -87,9 +87,12 @@ type Metadata interface {
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// Disc returns the disc number and total discs, or zero values if unavailable.
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Disc() (int, int)
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// Picture returns a picture, or nil if not avilable.
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// Picture returns a picture, or nil if not available.
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Picture() *Picture
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// Lyrics returns the lyrics, or an empty string if unavailable.
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Lyrics() string
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// Raw returns the raw mapping of retrieved tag names and associated values.
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// NB: tag/atom names are not standardised between formats.
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Raw() map[string]interface{}
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@ -75,4 +75,5 @@ func printMetadata(m tag.Metadata) {
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fmt.Printf(" Disc: %v of %v\n", disc, discCount)
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fmt.Printf(" Picture: %v\n", m.Picture())
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fmt.Printf(" Lyrics: %v\n", m.Lyrics())
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}
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