id3-go/id3v22.go

131 wiersze
7.2 KiB
Go

// Copyright 2013 Michael Yang. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package id3
import (
"io"
)
const (
V22FrameHeaderSize = 6
)
var (
// Common frame IDs
V22CommonFrame = map[string]string{
"Title": "TT2",
"Artist": "TP1",
"Album": "TAL",
"Year": "TYE",
"Genre": "TCO",
"Comments": "COM",
}
// V22FrameTypeMap specifies the frame IDs and constructors allowed in ID3v2.2
V22FrameTypeMap = map[string]FrameType{
"BUF": FrameType{id: "BUF", description: "Recommended buffer size", constructor: NewDataFrame},
"CNT": FrameType{id: "CNT", description: "Play counter", constructor: NewDataFrame},
"COM": FrameType{id: "COM", description: "Comments", constructor: NewUnsynchTextFrame},
"CRA": FrameType{id: "CRA", description: "Audio encryption", constructor: NewDataFrame},
"CRM": FrameType{id: "CRM", description: "Encrypted meta frame", constructor: NewDataFrame},
"ETC": FrameType{id: "ETC", description: "Event timing codes", constructor: NewDataFrame},
"EQU": FrameType{id: "EQU", description: "Equalization", constructor: NewDataFrame},
"GEO": FrameType{id: "GEO", description: "General encapsulated object", constructor: NewDataFrame},
"IPL": FrameType{id: "IPL", description: "Involved people list", constructor: NewDataFrame},
"LNK": FrameType{id: "LNK", description: "Linked information", constructor: NewDataFrame},
"MCI": FrameType{id: "MCI", description: "Music CD Identifier", constructor: NewDataFrame},
"MLL": FrameType{id: "MLL", description: "MPEG location lookup table", constructor: NewDataFrame},
"PIC": FrameType{id: "PIC", description: "Attached picture", constructor: NewDataFrame},
"POP": FrameType{id: "POP", description: "Popularimeter", constructor: NewDataFrame},
"REV": FrameType{id: "REV", description: "Reverb", constructor: NewDataFrame},
"RVA": FrameType{id: "RVA", description: "Relative volume adjustment", constructor: NewDataFrame},
"SLT": FrameType{id: "SLT", description: "Synchronized lyric/text", constructor: NewDataFrame},
"STC": FrameType{id: "STC", description: "Synced tempo codes", constructor: NewDataFrame},
"TAL": FrameType{id: "TAL", description: "Album/Movie/Show title", constructor: NewTextFrame},
"TBP": FrameType{id: "TBP", description: "BPM (Beats Per Minute)", constructor: NewTextFrame},
"TCM": FrameType{id: "TCM", description: "Composer", constructor: NewTextFrame},
"TCO": FrameType{id: "TCO", description: "Content type", constructor: NewTextFrame},
"TCR": FrameType{id: "TCR", description: "Copyright message", constructor: NewTextFrame},
"TDA": FrameType{id: "TDA", description: "Date", constructor: NewTextFrame},
"TDY": FrameType{id: "TDY", description: "Playlist delay", constructor: NewTextFrame},
"TEN": FrameType{id: "TEN", description: "Encoded by", constructor: NewTextFrame},
"TFT": FrameType{id: "TFT", description: "File type", constructor: NewTextFrame},
"TIM": FrameType{id: "TIM", description: "Time", constructor: NewTextFrame},
"TKE": FrameType{id: "TKE", description: "Initial key", constructor: NewTextFrame},
"TLA": FrameType{id: "TLA", description: "Language(s)", constructor: NewTextFrame},
"TLE": FrameType{id: "TLE", description: "Length", constructor: NewTextFrame},
"TMT": FrameType{id: "TMT", description: "Media type", constructor: NewTextFrame},
"TOA": FrameType{id: "TOA", description: "Original artist(s)/performer(s)", constructor: NewTextFrame},
"TOF": FrameType{id: "TOF", description: "Original filename", constructor: NewTextFrame},
"TOL": FrameType{id: "TOL", description: "Original Lyricist(s)/text writer(s)", constructor: NewTextFrame},
"TOR": FrameType{id: "TOR", description: "Original release year", constructor: NewTextFrame},
"TOT": FrameType{id: "TOT", description: "Original album/Movie/Show title", constructor: NewTextFrame},
"TP1": FrameType{id: "TP1", description: "Lead artist(s)/Lead performer(s)/Soloist(s)/Performing group", constructor: NewTextFrame},
"TP2": FrameType{id: "TP2", description: "Band/Orchestra/Accompaniment", constructor: NewTextFrame},
"TP3": FrameType{id: "TP3", description: "Conductor/Performer refinement", constructor: NewTextFrame},
"TP4": FrameType{id: "TP4", description: "Interpreted, remixed, or otherwise modified by", constructor: NewTextFrame},
"TPA": FrameType{id: "TPA", description: "Part of a set", constructor: NewTextFrame},
"TPB": FrameType{id: "TPB", description: "Publisher", constructor: NewTextFrame},
"TRC": FrameType{id: "TRC", description: "ISRC (International Standard Recording Code)", constructor: NewTextFrame},
"TRD": FrameType{id: "TRD", description: "Recording dates", constructor: NewTextFrame},
"TRK": FrameType{id: "TRK", description: "Track number/Position in set", constructor: NewTextFrame},
"TSI": FrameType{id: "TSI", description: "Size", constructor: NewTextFrame},
"TSS": FrameType{id: "TSS", description: "Software/hardware and settings used for encoding", constructor: NewTextFrame},
"TT1": FrameType{id: "TT1", description: "Content group description", constructor: NewTextFrame},
"TT2": FrameType{id: "TT2", description: "Title/Songname/Content description", constructor: NewTextFrame},
"TT3": FrameType{id: "TT3", description: "Subtitle/Description refinement", constructor: NewTextFrame},
"TXT": FrameType{id: "TXT", description: "Lyricist/text writer", constructor: NewTextFrame},
"TXX": FrameType{id: "TXX", description: "User defined text information frame", constructor: NewDescTextFrame},
"TYE": FrameType{id: "TYE", description: "Year", constructor: NewTextFrame},
"UFI": FrameType{id: "UFI", description: "Unique file identifier", constructor: NewDataFrame},
"ULT": FrameType{id: "ULT", description: "Unsychronized lyric/text transcription", constructor: NewDataFrame},
"WAF": FrameType{id: "WAF", description: "Official audio file webpage", constructor: NewDataFrame},
"WAR": FrameType{id: "WAR", description: "Official artist/performer webpage", constructor: NewDataFrame},
"WAS": FrameType{id: "WAS", description: "Official audio source webpage", constructor: NewDataFrame},
"WCM": FrameType{id: "WCM", description: "Commercial information", constructor: NewDataFrame},
"WCP": FrameType{id: "WCP", description: "Copyright/Legal information", constructor: NewDataFrame},
"WPB": FrameType{id: "WPB", description: "Publishers official webpage", constructor: NewDataFrame},
"WXX": FrameType{id: "WXX", description: "User defined URL link frame", constructor: NewDataFrame},
}
)
func NewV22Frame(reader io.Reader) Framer {
data := make([]byte, V22FrameHeaderSize)
if n, err := io.ReadFull(reader, data); n < V22FrameHeaderSize || err != nil {
return nil
}
id := string(data[:3])
t, ok := V22FrameTypeMap[id]
if !ok {
return nil
}
size, err := normint(data[3:6])
if err != nil {
return nil
}
h := FrameHead{
FrameType: t,
size: size,
}
frameData := make([]byte, size)
if n, err := io.ReadFull(reader, frameData); n < int(size) || err != nil {
return nil
}
return t.constructor(h, frameData)
}
func V22Bytes(f Framer) []byte {
headBytes := make([]byte, V22FrameHeaderSize)
copy(headBytes[:3], []byte(f.Id()))
copy(headBytes[3:6], normbytes(int32(f.Size()))[1:])
return append(headBytes, f.Bytes()...)
}