ID3v1.1 tag for .mp3 files: Go parsing library

ID3v1.1 tag is a method to store simple metadata in .mp3 files. The tag is appended to the end of file and spans exactly 128 bytes.

This type is supposed to be used on full .mp3 files, seeking to proper position automatically. If you're interesting in parsing only the tag itself, please use id3v1_1::id3_v1_1_tag subtype.

File extension

mp3

KS implementation details

License: CC0-1.0

References

This page hosts a formal specification of ID3v1.1 tag for .mp3 files using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

Go source code to parse ID3v1.1 tag for .mp3 files

id3v1_1.go

// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

import (
	"github.com/kaitai-io/kaitai_struct_go_runtime/kaitai"
	"io"
	"bytes"
)


/**
 * ID3v1.1 tag is a method to store simple metadata in .mp3 files. The
 * tag is appended to the end of file and spans exactly 128 bytes.
 * 
 * This type is supposed to be used on full .mp3 files, seeking to
 * proper position automatically. If you're interesting in parsing only
 * the tag itself, please use `id3v1_1::id3_v1_1_tag` subtype.
 * @see <a href="https://id3.org/ID3v1">Source</a>
 */
type Id3v11 struct {
	_io *kaitai.Stream
	_root *Id3v11
	_parent interface{}
	_f_id3v1Tag bool
	id3v1Tag *Id3v11_Id3V11Tag
}
func NewId3v11() *Id3v11 {
	return &Id3v11{
	}
}

func (this *Id3v11) Read(io *kaitai.Stream, parent interface{}, root *Id3v11) (err error) {
	this._io = io
	this._parent = parent
	this._root = root

	return err
}
func (this *Id3v11) Id3v1Tag() (v *Id3v11_Id3V11Tag, err error) {
	if (this._f_id3v1Tag) {
		return this.id3v1Tag, nil
	}
	_pos, err := this._io.Pos()
	if err != nil {
		return nil, err
	}
	tmp1, err := this._io.Size()
	if err != nil {
		return nil, err
	}
	_, err = this._io.Seek(int64((tmp1 - 128)), io.SeekStart)
	if err != nil {
		return nil, err
	}
	tmp2 := NewId3v11_Id3V11Tag()
	err = tmp2.Read(this._io, this, this._root)
	if err != nil {
		return nil, err
	}
	this.id3v1Tag = tmp2
	_, err = this._io.Seek(_pos, io.SeekStart)
	if err != nil {
		return nil, err
	}
	this._f_id3v1Tag = true
	this._f_id3v1Tag = true
	return this.id3v1Tag, nil
}

/**
 * ID3v1.1 tag itself, a fixed size 128 byte structure. Contains
 * several metadata fields as fixed-size strings.
 * 
 * Note that string encoding is not specified by standard, so real
 * encoding used would vary a lot from one implementation to
 * another. Most Windows-based applications tend to use "ANSI"
 * (i.e. locale-dependent encoding, usually one byte per
 * character). Some embedded applications allow selection of
 * charset.
 */

type Id3v11_Id3V11Tag_GenreEnum int
const (
	Id3v11_Id3V11Tag_GenreEnum__Blues Id3v11_Id3V11Tag_GenreEnum = 0
	Id3v11_Id3V11Tag_GenreEnum__ClassicRock Id3v11_Id3V11Tag_GenreEnum = 1
	Id3v11_Id3V11Tag_GenreEnum__Country Id3v11_Id3V11Tag_GenreEnum = 2
	Id3v11_Id3V11Tag_GenreEnum__Dance Id3v11_Id3V11Tag_GenreEnum = 3
	Id3v11_Id3V11Tag_GenreEnum__Disco Id3v11_Id3V11Tag_GenreEnum = 4
	Id3v11_Id3V11Tag_GenreEnum__Funk Id3v11_Id3V11Tag_GenreEnum = 5
	Id3v11_Id3V11Tag_GenreEnum__Grunge Id3v11_Id3V11Tag_GenreEnum = 6
	Id3v11_Id3V11Tag_GenreEnum__HipHop Id3v11_Id3V11Tag_GenreEnum = 7
	Id3v11_Id3V11Tag_GenreEnum__Jazz Id3v11_Id3V11Tag_GenreEnum = 8
	Id3v11_Id3V11Tag_GenreEnum__Metal Id3v11_Id3V11Tag_GenreEnum = 9
	Id3v11_Id3V11Tag_GenreEnum__NewAge Id3v11_Id3V11Tag_GenreEnum = 10
	Id3v11_Id3V11Tag_GenreEnum__Oldies Id3v11_Id3V11Tag_GenreEnum = 11
	Id3v11_Id3V11Tag_GenreEnum__Other Id3v11_Id3V11Tag_GenreEnum = 12
	Id3v11_Id3V11Tag_GenreEnum__Pop Id3v11_Id3V11Tag_GenreEnum = 13
	Id3v11_Id3V11Tag_GenreEnum__Rnb Id3v11_Id3V11Tag_GenreEnum = 14
	Id3v11_Id3V11Tag_GenreEnum__Rap Id3v11_Id3V11Tag_GenreEnum = 15
	Id3v11_Id3V11Tag_GenreEnum__Reggae Id3v11_Id3V11Tag_GenreEnum = 16
	Id3v11_Id3V11Tag_GenreEnum__Rock Id3v11_Id3V11Tag_GenreEnum = 17
	Id3v11_Id3V11Tag_GenreEnum__Techno Id3v11_Id3V11Tag_GenreEnum = 18
	Id3v11_Id3V11Tag_GenreEnum__Industrial Id3v11_Id3V11Tag_GenreEnum = 19
	Id3v11_Id3V11Tag_GenreEnum__Alternative Id3v11_Id3V11Tag_GenreEnum = 20
	Id3v11_Id3V11Tag_GenreEnum__Ska Id3v11_Id3V11Tag_GenreEnum = 21
	Id3v11_Id3V11Tag_GenreEnum__DeathMetal Id3v11_Id3V11Tag_GenreEnum = 22
	Id3v11_Id3V11Tag_GenreEnum__Pranks Id3v11_Id3V11Tag_GenreEnum = 23
	Id3v11_Id3V11Tag_GenreEnum__Soundtrack Id3v11_Id3V11Tag_GenreEnum = 24
	Id3v11_Id3V11Tag_GenreEnum__EuroTechno Id3v11_Id3V11Tag_GenreEnum = 25
	Id3v11_Id3V11Tag_GenreEnum__Ambient Id3v11_Id3V11Tag_GenreEnum = 26
	Id3v11_Id3V11Tag_GenreEnum__TripHop Id3v11_Id3V11Tag_GenreEnum = 27
	Id3v11_Id3V11Tag_GenreEnum__Vocal Id3v11_Id3V11Tag_GenreEnum = 28
	Id3v11_Id3V11Tag_GenreEnum__JazzFunk Id3v11_Id3V11Tag_GenreEnum = 29
	Id3v11_Id3V11Tag_GenreEnum__Fusion Id3v11_Id3V11Tag_GenreEnum = 30
	Id3v11_Id3V11Tag_GenreEnum__Trance Id3v11_Id3V11Tag_GenreEnum = 31
	Id3v11_Id3V11Tag_GenreEnum__Classical Id3v11_Id3V11Tag_GenreEnum = 32
	Id3v11_Id3V11Tag_GenreEnum__Instrumental Id3v11_Id3V11Tag_GenreEnum = 33
	Id3v11_Id3V11Tag_GenreEnum__Acid Id3v11_Id3V11Tag_GenreEnum = 34
	Id3v11_Id3V11Tag_GenreEnum__House Id3v11_Id3V11Tag_GenreEnum = 35
	Id3v11_Id3V11Tag_GenreEnum__Game Id3v11_Id3V11Tag_GenreEnum = 36
	Id3v11_Id3V11Tag_GenreEnum__SoundClip Id3v11_Id3V11Tag_GenreEnum = 37
	Id3v11_Id3V11Tag_GenreEnum__Gospel Id3v11_Id3V11Tag_GenreEnum = 38
	Id3v11_Id3V11Tag_GenreEnum__Noise Id3v11_Id3V11Tag_GenreEnum = 39
	Id3v11_Id3V11Tag_GenreEnum__Alternrock Id3v11_Id3V11Tag_GenreEnum = 40
	Id3v11_Id3V11Tag_GenreEnum__Bass Id3v11_Id3V11Tag_GenreEnum = 41
	Id3v11_Id3V11Tag_GenreEnum__Soul Id3v11_Id3V11Tag_GenreEnum = 42
	Id3v11_Id3V11Tag_GenreEnum__Punk Id3v11_Id3V11Tag_GenreEnum = 43
	Id3v11_Id3V11Tag_GenreEnum__Space Id3v11_Id3V11Tag_GenreEnum = 44
	Id3v11_Id3V11Tag_GenreEnum__Meditative Id3v11_Id3V11Tag_GenreEnum = 45
	Id3v11_Id3V11Tag_GenreEnum__InstrumentalPop Id3v11_Id3V11Tag_GenreEnum = 46
	Id3v11_Id3V11Tag_GenreEnum__InstrumentalRock Id3v11_Id3V11Tag_GenreEnum = 47
	Id3v11_Id3V11Tag_GenreEnum__Ethnic Id3v11_Id3V11Tag_GenreEnum = 48
	Id3v11_Id3V11Tag_GenreEnum__Gothic Id3v11_Id3V11Tag_GenreEnum = 49
	Id3v11_Id3V11Tag_GenreEnum__Darkwave Id3v11_Id3V11Tag_GenreEnum = 50
	Id3v11_Id3V11Tag_GenreEnum__TechnoIndustrial Id3v11_Id3V11Tag_GenreEnum = 51
	Id3v11_Id3V11Tag_GenreEnum__Electronic Id3v11_Id3V11Tag_GenreEnum = 52
	Id3v11_Id3V11Tag_GenreEnum__PopFolk Id3v11_Id3V11Tag_GenreEnum = 53
	Id3v11_Id3V11Tag_GenreEnum__Eurodance Id3v11_Id3V11Tag_GenreEnum = 54
	Id3v11_Id3V11Tag_GenreEnum__Dream Id3v11_Id3V11Tag_GenreEnum = 55
	Id3v11_Id3V11Tag_GenreEnum__SouthernRock Id3v11_Id3V11Tag_GenreEnum = 56
	Id3v11_Id3V11Tag_GenreEnum__Comedy Id3v11_Id3V11Tag_GenreEnum = 57
	Id3v11_Id3V11Tag_GenreEnum__Cult Id3v11_Id3V11Tag_GenreEnum = 58
	Id3v11_Id3V11Tag_GenreEnum__Gangsta Id3v11_Id3V11Tag_GenreEnum = 59
	Id3v11_Id3V11Tag_GenreEnum__Top40 Id3v11_Id3V11Tag_GenreEnum = 60
	Id3v11_Id3V11Tag_GenreEnum__ChristianRap Id3v11_Id3V11Tag_GenreEnum = 61
	Id3v11_Id3V11Tag_GenreEnum__PopFunk Id3v11_Id3V11Tag_GenreEnum = 62
	Id3v11_Id3V11Tag_GenreEnum__Jungle Id3v11_Id3V11Tag_GenreEnum = 63
	Id3v11_Id3V11Tag_GenreEnum__NativeAmerican Id3v11_Id3V11Tag_GenreEnum = 64
	Id3v11_Id3V11Tag_GenreEnum__Cabaret Id3v11_Id3V11Tag_GenreEnum = 65
	Id3v11_Id3V11Tag_GenreEnum__NewWave Id3v11_Id3V11Tag_GenreEnum = 66
	Id3v11_Id3V11Tag_GenreEnum__Psychadelic Id3v11_Id3V11Tag_GenreEnum = 67
	Id3v11_Id3V11Tag_GenreEnum__Rave Id3v11_Id3V11Tag_GenreEnum = 68
	Id3v11_Id3V11Tag_GenreEnum__Showtunes Id3v11_Id3V11Tag_GenreEnum = 69
	Id3v11_Id3V11Tag_GenreEnum__Trailer Id3v11_Id3V11Tag_GenreEnum = 70
	Id3v11_Id3V11Tag_GenreEnum__LoFi Id3v11_Id3V11Tag_GenreEnum = 71
	Id3v11_Id3V11Tag_GenreEnum__Tribal Id3v11_Id3V11Tag_GenreEnum = 72
	Id3v11_Id3V11Tag_GenreEnum__AcidPunk Id3v11_Id3V11Tag_GenreEnum = 73
	Id3v11_Id3V11Tag_GenreEnum__AcidJazz Id3v11_Id3V11Tag_GenreEnum = 74
	Id3v11_Id3V11Tag_GenreEnum__Polka Id3v11_Id3V11Tag_GenreEnum = 75
	Id3v11_Id3V11Tag_GenreEnum__Retro Id3v11_Id3V11Tag_GenreEnum = 76
	Id3v11_Id3V11Tag_GenreEnum__Musical Id3v11_Id3V11Tag_GenreEnum = 77
	Id3v11_Id3V11Tag_GenreEnum__RockNRoll Id3v11_Id3V11Tag_GenreEnum = 78
	Id3v11_Id3V11Tag_GenreEnum__HardRock Id3v11_Id3V11Tag_GenreEnum = 79
	Id3v11_Id3V11Tag_GenreEnum__Folk Id3v11_Id3V11Tag_GenreEnum = 80
	Id3v11_Id3V11Tag_GenreEnum__FolkRock Id3v11_Id3V11Tag_GenreEnum = 81
	Id3v11_Id3V11Tag_GenreEnum__NationalFolk Id3v11_Id3V11Tag_GenreEnum = 82
	Id3v11_Id3V11Tag_GenreEnum__Swing Id3v11_Id3V11Tag_GenreEnum = 83
	Id3v11_Id3V11Tag_GenreEnum__FastFusion Id3v11_Id3V11Tag_GenreEnum = 84
	Id3v11_Id3V11Tag_GenreEnum__Bebob Id3v11_Id3V11Tag_GenreEnum = 85
	Id3v11_Id3V11Tag_GenreEnum__Latin Id3v11_Id3V11Tag_GenreEnum = 86
	Id3v11_Id3V11Tag_GenreEnum__Revival Id3v11_Id3V11Tag_GenreEnum = 87
	Id3v11_Id3V11Tag_GenreEnum__Celtic Id3v11_Id3V11Tag_GenreEnum = 88
	Id3v11_Id3V11Tag_GenreEnum__Bluegrass Id3v11_Id3V11Tag_GenreEnum = 89
	Id3v11_Id3V11Tag_GenreEnum__Avantgarde Id3v11_Id3V11Tag_GenreEnum = 90
	Id3v11_Id3V11Tag_GenreEnum__GothicRock Id3v11_Id3V11Tag_GenreEnum = 91
	Id3v11_Id3V11Tag_GenreEnum__ProgressiveRock Id3v11_Id3V11Tag_GenreEnum = 92
	Id3v11_Id3V11Tag_GenreEnum__PsychedelicRock Id3v11_Id3V11Tag_GenreEnum = 93
	Id3v11_Id3V11Tag_GenreEnum__SymphonicRock Id3v11_Id3V11Tag_GenreEnum = 94
	Id3v11_Id3V11Tag_GenreEnum__SlowRock Id3v11_Id3V11Tag_GenreEnum = 95
	Id3v11_Id3V11Tag_GenreEnum__BigBand Id3v11_Id3V11Tag_GenreEnum = 96
	Id3v11_Id3V11Tag_GenreEnum__Chorus Id3v11_Id3V11Tag_GenreEnum = 97
	Id3v11_Id3V11Tag_GenreEnum__EasyListening Id3v11_Id3V11Tag_GenreEnum = 98
	Id3v11_Id3V11Tag_GenreEnum__Acoustic Id3v11_Id3V11Tag_GenreEnum = 99
	Id3v11_Id3V11Tag_GenreEnum__Humour Id3v11_Id3V11Tag_GenreEnum = 100
	Id3v11_Id3V11Tag_GenreEnum__Speech Id3v11_Id3V11Tag_GenreEnum = 101
	Id3v11_Id3V11Tag_GenreEnum__Chanson Id3v11_Id3V11Tag_GenreEnum = 102
	Id3v11_Id3V11Tag_GenreEnum__Opera Id3v11_Id3V11Tag_GenreEnum = 103
	Id3v11_Id3V11Tag_GenreEnum__ChamberMusic Id3v11_Id3V11Tag_GenreEnum = 104
	Id3v11_Id3V11Tag_GenreEnum__Sonata Id3v11_Id3V11Tag_GenreEnum = 105
	Id3v11_Id3V11Tag_GenreEnum__Symphony Id3v11_Id3V11Tag_GenreEnum = 106
	Id3v11_Id3V11Tag_GenreEnum__BootyBass Id3v11_Id3V11Tag_GenreEnum = 107
	Id3v11_Id3V11Tag_GenreEnum__Primus Id3v11_Id3V11Tag_GenreEnum = 108
	Id3v11_Id3V11Tag_GenreEnum__PornGroove Id3v11_Id3V11Tag_GenreEnum = 109
	Id3v11_Id3V11Tag_GenreEnum__Satire Id3v11_Id3V11Tag_GenreEnum = 110
	Id3v11_Id3V11Tag_GenreEnum__SlowJam Id3v11_Id3V11Tag_GenreEnum = 111
	Id3v11_Id3V11Tag_GenreEnum__Club Id3v11_Id3V11Tag_GenreEnum = 112
	Id3v11_Id3V11Tag_GenreEnum__Tango Id3v11_Id3V11Tag_GenreEnum = 113
	Id3v11_Id3V11Tag_GenreEnum__Samba Id3v11_Id3V11Tag_GenreEnum = 114
	Id3v11_Id3V11Tag_GenreEnum__Folklore Id3v11_Id3V11Tag_GenreEnum = 115
	Id3v11_Id3V11Tag_GenreEnum__Ballad Id3v11_Id3V11Tag_GenreEnum = 116
	Id3v11_Id3V11Tag_GenreEnum__PowerBallad Id3v11_Id3V11Tag_GenreEnum = 117
	Id3v11_Id3V11Tag_GenreEnum__RhythmicSoul Id3v11_Id3V11Tag_GenreEnum = 118
	Id3v11_Id3V11Tag_GenreEnum__Freestyle Id3v11_Id3V11Tag_GenreEnum = 119
	Id3v11_Id3V11Tag_GenreEnum__Duet Id3v11_Id3V11Tag_GenreEnum = 120
	Id3v11_Id3V11Tag_GenreEnum__PunkRock Id3v11_Id3V11Tag_GenreEnum = 121
	Id3v11_Id3V11Tag_GenreEnum__DrumSolo Id3v11_Id3V11Tag_GenreEnum = 122
	Id3v11_Id3V11Tag_GenreEnum__ACapella Id3v11_Id3V11Tag_GenreEnum = 123
	Id3v11_Id3V11Tag_GenreEnum__EuroHouse Id3v11_Id3V11Tag_GenreEnum = 124
	Id3v11_Id3V11Tag_GenreEnum__DanceHall Id3v11_Id3V11Tag_GenreEnum = 125
)
type Id3v11_Id3V11Tag struct {
	Magic []byte
	Title []byte
	Artist []byte
	Album []byte
	Year string
	Comment []byte
	Genre Id3v11_Id3V11Tag_GenreEnum
	_io *kaitai.Stream
	_root *Id3v11
	_parent *Id3v11
}
func NewId3v11_Id3V11Tag() *Id3v11_Id3V11Tag {
	return &Id3v11_Id3V11Tag{
	}
}

func (this *Id3v11_Id3V11Tag) Read(io *kaitai.Stream, parent *Id3v11, root *Id3v11) (err error) {
	this._io = io
	this._parent = parent
	this._root = root

	tmp3, err := this._io.ReadBytes(int(3))
	if err != nil {
		return err
	}
	tmp3 = tmp3
	this.Magic = tmp3
	if !(bytes.Equal(this.Magic, []uint8{84, 65, 71})) {
		return kaitai.NewValidationNotEqualError([]uint8{84, 65, 71}, this.Magic, this._io, "/types/id3_v1_1_tag/seq/0")
	}
	tmp4, err := this._io.ReadBytes(int(30))
	if err != nil {
		return err
	}
	tmp4 = tmp4
	this.Title = tmp4
	tmp5, err := this._io.ReadBytes(int(30))
	if err != nil {
		return err
	}
	tmp5 = tmp5
	this.Artist = tmp5
	tmp6, err := this._io.ReadBytes(int(30))
	if err != nil {
		return err
	}
	tmp6 = tmp6
	this.Album = tmp6
	tmp7, err := this._io.ReadBytes(int(4))
	if err != nil {
		return err
	}
	tmp7 = tmp7
	this.Year = string(tmp7)
	tmp8, err := this._io.ReadBytes(int(30))
	if err != nil {
		return err
	}
	tmp8 = tmp8
	this.Comment = tmp8
	tmp9, err := this._io.ReadU1()
	if err != nil {
		return err
	}
	this.Genre = Id3v11_Id3V11Tag_GenreEnum(tmp9)
	return err
}

/**
 * Song title
 */

/**
 * Artist name
 */

/**
 * Album title
 */

/**
 * Year of release
 */

/**
 * Arbitary comment
 */