kopia lustrzana https://github.com/jcs/id3-go
Add v2.2 frame constructor and types
Michael Yang
rodzic
a285701bb4
commit
87618aedee
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// Copyright 2013 Michael Yang. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package id3
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import (
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"io"
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)
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const (
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V2FrameHeaderSize = 6
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)
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var (
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// V2FrameTypeMap specifies the frame IDs and constructors allowed in ID3v2.2
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V2FrameTypeMap = map[string]FrameType{
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"BUF": FrameType{id: "BUF", description: "Recommended buffer size", constructor: NewDataFrame},
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"CNT": FrameType{id: "CNT", description: "Play counter", constructor: NewDataFrame},
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"COM": FrameType{id: "COM", description: "Comments", constructor: NewDataFrame},
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"CRA": FrameType{id: "CRA", description: "Audio encryption", constructor: NewDataFrame},
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"CRM": FrameType{id: "CRM", description: "Encrypted meta frame", constructor: NewDataFrame},
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"ETC": FrameType{id: "ETC", description: "Event timing codes", constructor: NewDataFrame},
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"EQU": FrameType{id: "EQU", description: "Equalization", constructor: NewDataFrame},
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"GEO": FrameType{id: "GEO", description: "General encapsulated object", constructor: NewDataFrame},
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"IPL": FrameType{id: "IPL", description: "Involved people list", constructor: NewDataFrame},
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"LNK": FrameType{id: "LNK", description: "Linked information", constructor: NewDataFrame},
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"MCI": FrameType{id: "MCI", description: "Music CD Identifier", constructor: NewDataFrame},
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"MLL": FrameType{id: "MLL", description: "MPEG location lookup table", constructor: NewDataFrame},
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"PIC": FrameType{id: "PIC", description: "Attached picture", constructor: NewDataFrame},
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"POP": FrameType{id: "POP", description: "Popularimeter", constructor: NewDataFrame},
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"REV": FrameType{id: "REV", description: "Reverb", constructor: NewDataFrame},
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"RVA": FrameType{id: "RVA", description: "Relative volume adjustment", constructor: NewDataFrame},
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"SLT": FrameType{id: "SLT", description: "Synchronized lyric/text", constructor: NewDataFrame},
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"STC": FrameType{id: "STC", description: "Synced tempo codes", constructor: NewDataFrame},
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"TAL": FrameType{id: "TAL", description: "Album/Movie/Show title", constructor: NewTextFrame},
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"TBP": FrameType{id: "TBP", description: "BPM (Beats Per Minute)", constructor: NewTextFrame},
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"TCM": FrameType{id: "TCM", description: "Composer", constructor: NewTextFrame},
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"TCO": FrameType{id: "TCO", description: "Content type", constructor: NewTextFrame},
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"TCR": FrameType{id: "TCR", description: "Copyright message", constructor: NewTextFrame},
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"TDA": FrameType{id: "TDA", description: "Date", constructor: NewTextFrame},
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"TDY": FrameType{id: "TDY", description: "Playlist delay", constructor: NewTextFrame},
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"TEN": FrameType{id: "TEN", description: "Encoded by", constructor: NewTextFrame},
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"TFT": FrameType{id: "TFT", description: "File type", constructor: NewTextFrame},
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"TIM": FrameType{id: "TIM", description: "Time", constructor: NewTextFrame},
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"TKE": FrameType{id: "TKE", description: "Initial key", constructor: NewTextFrame},
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"TLA": FrameType{id: "TLA", description: "Language(s)", constructor: NewTextFrame},
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"TLE": FrameType{id: "TLE", description: "Length", constructor: NewTextFrame},
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"TMT": FrameType{id: "TMT", description: "Media type", constructor: NewTextFrame},
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"TOA": FrameType{id: "TOA", description: "Original artist(s)/performer(s)", constructor: NewTextFrame},
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"TOF": FrameType{id: "TOF", description: "Original filename", constructor: NewTextFrame},
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"TOL": FrameType{id: "TOL", description: "Original Lyricist(s)/text writer(s)", constructor: NewTextFrame},
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"TOR": FrameType{id: "TOR", description: "Original release year", constructor: NewTextFrame},
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"TOT": FrameType{id: "TOT", description: "Original album/Movie/Show title", constructor: NewTextFrame},
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"TP1": FrameType{id: "TP1", description: "Lead artist(s)/Lead performer(s)/Soloist(s)/Performing group", constructor: NewTextFrame},
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"TP2": FrameType{id: "TP2", description: "Band/Orchestra/Accompaniment", constructor: NewTextFrame},
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"TP3": FrameType{id: "TP3", description: "Conductor/Performer refinement", constructor: NewTextFrame},
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"TP4": FrameType{id: "TP4", description: "Interpreted, remixed, or otherwise modified by", constructor: NewTextFrame},
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"TPA": FrameType{id: "TPA", description: "Part of a set", constructor: NewTextFrame},
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"TPB": FrameType{id: "TPB", description: "Publisher", constructor: NewTextFrame},
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"TRC": FrameType{id: "TRC", description: "ISRC (International Standard Recording Code)", constructor: NewTextFrame},
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"TRD": FrameType{id: "TRD", description: "Recording dates", constructor: NewTextFrame},
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"TRK": FrameType{id: "TRK", description: "Track number/Position in set", constructor: NewTextFrame},
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"TSI": FrameType{id: "TSI", description: "Size", constructor: NewTextFrame},
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"TSS": FrameType{id: "TSS", description: "Software/hardware and settings used for encoding", constructor: NewTextFrame},
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"TT1": FrameType{id: "TT1", description: "Content group description", constructor: NewTextFrame},
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"TT2": FrameType{id: "TT2", description: "Title/Songname/Content description", constructor: NewTextFrame},
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"TT3": FrameType{id: "TT3", description: "Subtitle/Description refinement", constructor: NewTextFrame},
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"TXT": FrameType{id: "TXT", description: "Lyricist/text writer", constructor: NewTextFrame},
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"TXX": FrameType{id: "TXX", description: "User defined text information frame", constructor: NewDescTextFrame},
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"TYE": FrameType{id: "TYE", description: "Year", constructor: NewTextFrame},
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"UFI": FrameType{id: "UFI", description: "Unique file identifier", constructor: NewDataFrame},
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"ULT": FrameType{id: "ULT", description: "Unsychronized lyric/text transcription", constructor: NewDataFrame},
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"WAF": FrameType{id: "WAF", description: "Official audio file webpage", constructor: NewDataFrame},
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"WAR": FrameType{id: "WAR", description: "Official artist/performer webpage", constructor: NewDataFrame},
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"WAS": FrameType{id: "WAS", description: "Official audio source webpage", constructor: NewDataFrame},
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"WCM": FrameType{id: "WCM", description: "Commercial information", constructor: NewDataFrame},
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"WCP": FrameType{id: "WCP", description: "Copyright/Legal information", constructor: NewDataFrame},
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"WPB": FrameType{id: "WPB", description: "Publishers official webpage", constructor: NewDataFrame},
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"WXX": FrameType{id: "WXX", description: "User defined URL link frame", constructor: NewDataFrame},
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}
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)
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func NewV2Frame(reader io.Reader) Framer {
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data := make([]byte, V2FrameHeaderSize)
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if n, err := io.ReadFull(reader, data); n < V2FrameHeaderSize || err != nil {
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return nil
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}
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id := string(data[:3])
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t, ok := V2FrameTypeMap[id]
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if !ok {
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return nil
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}
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size, err := normint(data[3:6])
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if err != nil {
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return nil
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}
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h := FrameHead{
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FrameType: t,
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size: size,
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}
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frameData := make([]byte, size)
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if n, err := io.ReadFull(reader, frameData); n < int(size) || err != nil {
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return nil
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}
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return t.constructor(h, frameData)
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}
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func V2Bytes(f Framer) []byte {
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headBytes := make([]byte, V2FrameHeaderSize)
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copy(headBytes[:3], []byte(f.Id()))
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copy(headBytes[3:6], normbytes(int32(f.Size()))[1:])
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return append(headBytes, f.Bytes()...)
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}
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