fq/format/id3/id3v1.go

package id3

import (
	"strings"

	"github.com/wader/fq/format"
	"github.com/wader/fq/format/registry"
	"github.com/wader/fq/pkg/decode"
)

// TODO: comment 28 long, zero byte, track number

func init() {
	registry.MustRegister(&decode.Format{
		Name:        format.ID3V1,
		Description: "ID3v1 metadata",
		DecodeFn:    id3v1Decode,
	})
}

func field(d *decode.D, name string, nBytes int) {
	d.FieldStrFn(name, func() (string, string) {
		return strings.Trim(d.UTF8(nBytes), "\x00 "), ""
	})
}

// Decode ID3v1 tag
func id3v1Decode(d *decode.D, in interface{}) interface{} {
	d.ValidateAtLeastBitsLeft(128 * 8)
	d.FieldValidateUTF8("magic", "TAG")
	if d.PeekBits(8) == uint64('+') {
		d.Invalid("looks like id3v11")
	}
	field(d, "song_name", 30)
	field(d, "artist", 30)
	field(d, "album_name", 30)
	field(d, "year", 4)
	field(d, "comment", 30)
	// from https://en.wikipedia.org/wiki/List_of_ID3v1_Genres
	d.FieldStringMapFn("genre", map[uint64]string{
		0:   "Blues",
		1:   "Classic Rock",
		2:   "Country",
		3:   "Dance",
		4:   "Disco",
		5:   "Funk",
		6:   "Grunge",
		7:   "Hip-Hop",
		8:   "Jazz",
		9:   "Metal",
		10:  "New Age",
		11:  "Oldies",
		12:  "Other",
		13:  "Pop",
		14:  "Rhythm and Blues",
		15:  "Rap",
		16:  "Reggae",
		17:  "Rock",
		18:  "Techno",
		19:  "Industrial",
		20:  "Alternative",
		21:  "Ska",
		22:  "Death Metal",
		23:  "Pranks",
		24:  "Soundtrack",
		25:  "Euro-Techno",
		26:  "Ambient",
		27:  "Trip-Hop",
		28:  "Vocal",
		29:  "Jazz & Funk",
		30:  "Fusion",
		31:  "Trance",
		32:  "Classical",
		33:  "Instrumental",
		34:  "Acid",
		35:  "House",
		36:  "Game",
		37:  "Sound clip",
		38:  "Gospel",
		39:  "Noise",
		40:  "Alternative Rock",
		41:  "Bass",
		42:  "Soul",
		43:  "Punk",
		44:  "Space",
		45:  "Meditative",
		46:  "Instrumental Pop",
		47:  "Instrumental Rock",
		48:  "Ethnic",
		49:  "Gothic",
		50:  "Darkwave",
		51:  "Techno-Industrial",
		52:  "Electronic",
		53:  "Pop-Folk",
		54:  "Eurodance",
		55:  "Dream",
		56:  "Southern Rock",
		57:  "Comedy",
		58:  "Cult",
		59:  "Gangsta",
		60:  "Top 40",
		61:  "Christian Rap",
		62:  "Pop/Funk",
		63:  "Jungle music",
		64:  "Native US",
		65:  "Cabaret",
		66:  "New Wave",
		67:  "Psychedelic",
		68:  "Rave",
		69:  "Showtunes",
		70:  "Trailer",
		71:  "Lo-Fi",
		72:  "Tribal",
		73:  "Acid Punk",
		74:  "Acid Jazz",
		75:  "Polka",
		76:  "Retro",
		77:  "Musical",
		78:  "Rock ’n’ Roll",
		79:  "Hard Rock",
		80:  "Folk",
		81:  "Folk-Rock",
		82:  "National Folk",
		83:  "Swing",
		84:  "Fast Fusion",
		85:  "Bebop",
		86:  "Latin",
		87:  "Revival",
		88:  "Celtic",
		89:  "Bluegrass",
		90:  "Avantgarde",
		91:  "Gothic Rock",
		92:  "Progressive Rock",
		93:  "Psychedelic Rock",
		94:  "Symphonic Rock",
		95:  "Slow Rock",
		96:  "Big Band",
		97:  "Chorus",
		98:  "Easy Listening",
		99:  "Acoustic",
		100: "Humour",
		101: "Speech",
		102: "Chanson",
		103: "Opera",
		104: "Chamber Music",
		105: "Sonata",
		106: "Symphony",
		107: "Booty Bass",
		108: "Primus",
		109: "Porn Groove",
		110: "Satire",
		111: "Slow Jam",
		112: "Club",
		113: "Tango",
		114: "Samba",
		115: "Folklore",
		116: "Ballad",
		117: "Power Ballad",
		118: "Rhythmic Soul",
		119: "Freestyle",
		120: "Duet",
		121: "Punk Rock",
		122: "Drum Solo",
		123: "A cappella",
		124: "Euro-House",
		125: "Dance Hall",
		126: "Goa music",
		127: "Drum & Bass",
		128: "Club-House",
		129: "Hardcore Techno",
		130: "Terror",
		131: "Indie",
		132: "BritPop",
		133: "Negerpunk",
		134: "Polsk Punk",
		135: "Beat",
		136: "Christian Gangsta Rap",
		137: "Heavy Metal",
		138: "Black Metal",
		139: "Crossover",
		140: "Contemporary Christian",
		141: "Christian Rock",
		142: "Merengue",
		143: "Salsa",
		144: "Thrash Metal",
		145: "Anime",
		146: "Jpop",
		147: "Synthpop",
		148: "Abstract",
		149: "Art Rock",
		150: "Baroque",
		151: "Bhangra",
		152: "Big beat",
		153: "Breakbeat",
		154: "Chillout",
		155: "Downtempo",
		156: "Dub",
		157: "EBM",
		158: "Eclectic",
		159: "Electro",
		160: "Electroclash",
		161: "Emo",
		162: "Experimental",
		163: "Garage",
		164: "Global",
		165: "IDM",
		166: "Illbient",
		167: "Industro-Goth",
		168: "Jam Band",
		169: "Krautrock",
		170: "Leftfield",
		171: "Lounge",
		172: "Math Rock",
		173: "New Romantic",
		174: "Nu-Breakz",
		175: "Post-Punk",
		176: "Post-Rock",
		177: "Psytrance",
		178: "Shoegaze",
		179: "Space Rock",
		180: "Trop Rock",
		181: "World Music",
		182: "Neoclassical",
		183: "Audiobook",
		184: "Audio Theatre",
		185: "Neue Deutsche Welle",
		186: "Podcast",
		187: "Indie-Rock",
		188: "G-Funk",
		189: "Dubstep",
		190: "Garage Rock",
		191: "Psybient",
	}, "Unknown", d.U8, decode.NumberDecimal)

	return nil
}