823 lines
22 KiB
Go
823 lines
22 KiB
Go
// Copyright 2015, David Howden
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tag
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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var atomTypes = map[int]string{
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0: "implicit", // automatic based on atom name
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1: "text",
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13: "jpeg",
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14: "png",
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21: "uint8",
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}
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// NB: atoms does not include "----", this is handled separately
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var atoms = atomNames(map[string]string{
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"\xa9alb": "album",
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"\xa9art": "artist",
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"\xa9ART": "artist",
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"aART": "album_artist",
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"\xa9day": "year",
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"\xa9nam": "title",
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"\xa9gen": "genre",
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"gnre": "genre ID3v1 ID",
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"geID": "genre ID",
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"trkn": "track",
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"\xa9wrt": "composer",
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"\xa9too": "encoder",
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"cprt": "copyright",
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"covr": "picture",
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"\xa9grp": "grouping",
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"keyw": "keyword",
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"\xa9lyr": "lyrics",
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"\xa9cmt": "comment",
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"tmpo": "tempo",
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"cpil": "compilation",
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"disk": "disc",
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})
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// Source: https://exiftool.org/TagNames/QuickTime.html
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var genreIDValues = map[int]string{
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2: "Blues",
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3: "Comedy",
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4: "Children's Music",
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5: "Classical",
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6: "Country",
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7: "Electronic",
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8: "Holiday",
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9: "Classical|Opera",
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10: "Singer/Songwriter",
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11: "Jazz",
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12: "Latino",
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13: "New Age",
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14: "Pop",
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15: "R&B/Soul",
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16: "Soundtrack",
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17: "Dance",
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18: "Hip-Hop/Rap",
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19: "World",
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20: "Alternative",
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21: "Rock",
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22: "Christian & Gospel",
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23: "Vocal",
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24: "Reggae",
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25: "Easy Listening",
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27: "J-Pop",
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28: "Enka",
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29: "Anime",
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30: "Kayokyoku",
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50: "Fitness & Workout",
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51: "Pop|K-Pop",
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52: "Karaoke",
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53: "Instrumental",
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1001: "Alternative|College Rock",
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1002: "Alternative|Goth Rock",
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1003: "Alternative|Grunge",
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1004: "Alternative|Indie Rock",
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1005: "Alternative|New Wave",
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1006: "Alternative|Punk",
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1007: "Blues|Chicago Blues",
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1009: "Blues|Classic Blues",
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1010: "Blues|Contemporary Blues",
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1011: "Blues|Country Blues",
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1012: "Blues|Delta Blues",
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1013: "Blues|Electric Blues",
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1014: "Children's Music|Lullabies",
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1015: "Children's Music|Sing-Along",
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1016: "Children's Music|Stories",
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1017: "Classical|Avant-Garde",
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1018: "Classical|Baroque Era",
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1019: "Classical|Chamber Music",
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1020: "Classical|Chant",
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1021: "Classical|Choral",
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1022: "Classical|Classical Crossover",
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1023: "Classical|Early Music",
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1024: "Classical|Impressionist",
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1025: "Classical|Medieval Era",
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1026: "Classical|Minimalism",
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1027: "Classical|Modern Era",
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1028: "Classical|Opera",
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1029: "Classical|Orchestral",
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1030: "Classical|Renaissance",
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1031: "Classical|Romantic Era",
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1032: "Classical|Wedding Music",
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1033: "Country|Alternative Country",
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1034: "Country|Americana",
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1035: "Country|Bluegrass",
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1036: "Country|Contemporary Bluegrass",
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1037: "Country|Contemporary Country",
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1038: "Country|Country Gospel",
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1039: "Country|Honky Tonk",
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1040: "Country|Outlaw Country",
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1041: "Country|Traditional Bluegrass",
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1042: "Country|Traditional Country",
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1043: "Country|Urban Cowboy",
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1044: "Dance|Breakbeat",
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1045: "Dance|Exercise",
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1046: "Dance|Garage",
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1047: "Dance|Hardcore",
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1048: "Dance|House",
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1049: "Dance|Jungle/Drum'n'bass",
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1050: "Dance|Techno",
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1051: "Dance|Trance",
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1052: "Jazz|Big Band",
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1053: "Jazz|Bop",
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1054: "Easy Listening|Lounge",
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1055: "Easy Listening|Swing",
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1056: "Electronic|Ambient",
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1057: "Electronic|Downtempo",
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1058: "Electronic|Electronica",
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1060: "Electronic|IDM/Experimental",
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1061: "Electronic|Industrial",
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1062: "Singer/Songwriter|Alternative Folk",
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1063: "Singer/Songwriter|Contemporary Folk",
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1064: "Singer/Songwriter|Contemporary Singer/Songwriter",
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1065: "Singer/Songwriter|Folk-Rock",
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1066: "Singer/Songwriter|New Acoustic",
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1067: "Singer/Songwriter|Traditional Folk",
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1068: "Hip-Hop/Rap|Alternative Rap",
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1069: "Hip-Hop/Rap|Dirty South",
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1070: "Hip-Hop/Rap|East Coast Rap",
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1071: "Hip-Hop/Rap|Gangsta Rap",
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1072: "Hip-Hop/Rap|Hardcore Rap",
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1073: "Hip-Hop/Rap|Hip-Hop",
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1074: "Hip-Hop/Rap|Latin Rap",
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1075: "Hip-Hop/Rap|Old School Rap",
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1076: "Hip-Hop/Rap|Rap",
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1077: "Hip-Hop/Rap|Underground Rap",
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1078: "Hip-Hop/Rap|West Coast Rap",
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1079: "Holiday|Chanukah",
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1080: "Holiday|Christmas",
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1081: "Holiday|Christmas: Children's",
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1082: "Holiday|Christmas: Classic",
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1083: "Holiday|Christmas: Classical",
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1084: "Holiday|Christmas: Jazz",
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1085: "Holiday|Christmas: Modern",
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1086: "Holiday|Christmas: Pop",
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1087: "Holiday|Christmas: R&B",
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1088: "Holiday|Christmas: Religious",
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1089: "Holiday|Christmas: Rock",
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1090: "Holiday|Easter",
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1091: "Holiday|Halloween",
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1092: "Holiday|Holiday: Other",
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1093: "Holiday|Thanksgiving",
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1094: "Christian & Gospel|CCM",
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1095: "Christian & Gospel|Christian Metal",
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1096: "Christian & Gospel|Christian Pop",
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1097: "Christian & Gospel|Christian Rap",
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1098: "Christian & Gospel|Christian Rock",
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1099: "Christian & Gospel|Classic Christian",
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1100: "Christian & Gospel|Contemporary Gospel",
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1101: "Christian & Gospel|Gospel",
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1103: "Christian & Gospel|Praise & Worship",
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1104: "Christian & Gospel|Southern Gospel",
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1105: "Christian & Gospel|Traditional Gospel",
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1106: "Jazz|Avant-Garde Jazz",
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1107: "Jazz|Contemporary Jazz",
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1108: "Jazz|Crossover Jazz",
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1109: "Jazz|Dixieland",
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1110: "Jazz|Fusion",
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1111: "Jazz|Latin Jazz",
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1112: "Jazz|Mainstream Jazz",
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1113: "Jazz|Ragtime",
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1114: "Jazz|Smooth Jazz",
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1115: "Latino|Latin Jazz",
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1116: "Latino|Contemporary Latin",
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1117: "Latino|Pop Latino",
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1118: "Latino|Raices",
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1119: "Latino|Urbano latino",
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1120: "Latino|Baladas y Boleros",
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1121: "Latino|Rock y Alternativo",
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1122: "Brazilian",
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1123: "Latino|Musica Mexicana",
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1124: "Latino|Musica tropical",
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1125: "New Age|Environmental",
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1126: "New Age|Healing",
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1127: "New Age|Meditation",
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1128: "New Age|Nature",
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1129: "New Age|Relaxation",
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1130: "New Age|Travel",
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1131: "Pop|Adult Contemporary",
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1132: "Pop|Britpop",
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1133: "Pop|Pop/Rock",
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1134: "Pop|Soft Rock",
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1135: "Pop|Teen Pop",
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1136: "R&B/Soul|Contemporary R&B",
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1137: "R&B/Soul|Disco",
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1138: "R&B/Soul|Doo Wop",
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1139: "R&B/Soul|Funk",
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1140: "R&B/Soul|Motown",
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1141: "R&B/Soul|Neo-Soul",
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1142: "R&B/Soul|Quiet Storm",
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1143: "R&B/Soul|Soul",
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1144: "Rock|Adult Alternative",
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1145: "Rock|American Trad Rock",
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1146: "Rock|Arena Rock",
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1147: "Rock|Blues-Rock",
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1148: "Rock|British Invasion",
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1149: "Rock|Death Metal/Black Metal",
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1150: "Rock|Glam Rock",
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1151: "Rock|Hair Metal",
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1152: "Rock|Hard Rock",
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1153: "Rock|Metal",
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1154: "Rock|Jam Bands",
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1155: "Rock|Prog-Rock/Art Rock",
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1156: "Rock|Psychedelic",
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1157: "Rock|Rock & Roll",
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1158: "Rock|Rockabilly",
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1159: "Rock|Roots Rock",
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1160: "Rock|Singer/Songwriter",
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1161: "Rock|Southern Rock",
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1162: "Rock|Surf",
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1163: "Rock|Tex-Mex",
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1165: "Soundtrack|Foreign Cinema",
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1166: "Soundtrack|Musicals",
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1167: "Comedy|Novelty",
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1168: "Soundtrack|Original Score",
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1169: "Soundtrack|Soundtrack",
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1171: "Comedy|Standup Comedy",
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1172: "Soundtrack|TV Soundtrack",
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1173: "Vocal|Standards",
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1174: "Vocal|Traditional Pop",
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1175: "Jazz|Vocal Jazz",
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1176: "Vocal|Vocal Pop",
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1177: "African|Afro-Beat",
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1178: "African|Afro-Pop",
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1179: "World|Cajun",
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1180: "World|Celtic",
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1181: "World|Celtic Folk",
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1182: "World|Contemporary Celtic",
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1183: "Reggae|Modern Dancehall",
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1184: "World|Drinking Songs",
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1185: "Indian|Indian Pop",
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1186: "World|Japanese Pop",
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1187: "World|Klezmer",
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1188: "World|Polka",
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1189: "World|Traditional Celtic",
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1190: "World|Worldbeat",
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1191: "World|Zydeco",
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1192: "Reggae|Roots Reggae",
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1193: "Reggae|Dub",
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1194: "Reggae|Ska",
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1195: "World|Caribbean",
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1196: "World|South America",
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1197: "Arabic",
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1198: "World|North America",
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1199: "World|Hawaii",
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1200: "World|Australia",
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1201: "World|Japan",
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1202: "World|France",
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1203: "African",
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1204: "World|Asia",
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1205: "World|Europe",
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1206: "World|South Africa",
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1207: "Jazz|Hard Bop",
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1208: "Jazz|Trad Jazz",
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1209: "Jazz|Cool Jazz",
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1210: "Blues|Acoustic Blues",
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1211: "Classical|High Classical",
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1220: "Brazilian|Axe",
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1221: "Brazilian|Bossa Nova",
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1222: "Brazilian|Choro",
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1223: "Brazilian|Forro",
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1224: "Brazilian|Frevo",
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1225: "Brazilian|MPB",
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1226: "Brazilian|Pagode",
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1227: "Brazilian|Samba",
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1228: "Brazilian|Sertanejo",
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1229: "Brazilian|Baile Funk",
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1230: "Alternative|Chinese Alt",
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1231: "Alternative|Korean Indie",
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1232: "Chinese",
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1233: "Chinese|Chinese Classical",
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1234: "Chinese|Chinese Flute",
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1235: "Chinese|Chinese Opera",
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1236: "Chinese|Chinese Orchestral",
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1237: "Chinese|Chinese Regional Folk",
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1238: "Chinese|Chinese Strings",
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1239: "Chinese|Taiwanese Folk",
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1240: "Chinese|Tibetan Native Music",
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1241: "Hip-Hop/Rap|Chinese Hip-Hop",
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1242: "Hip-Hop/Rap|Korean Hip-Hop",
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1243: "Korean",
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1244: "Korean|Korean Classical",
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1245: "Korean|Korean Trad Song",
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1246: "Korean|Korean Trad Instrumental",
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1247: "Korean|Korean Trad Theater",
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1248: "Rock|Chinese Rock",
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1249: "Rock|Korean Rock",
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1250: "Pop|C-Pop",
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1251: "Pop|Cantopop/HK-Pop",
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1252: "Pop|Korean Folk-Pop",
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1253: "Pop|Mandopop",
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1254: "Pop|Tai-Pop",
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1255: "Pop|Malaysian Pop",
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1256: "Pop|Pinoy Pop",
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1257: "Pop|Original Pilipino Music",
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1258: "Pop|Manilla Sound",
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1259: "Pop|Indo Pop",
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1260: "Pop|Thai Pop",
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1261: "Vocal|Trot",
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1262: "Indian",
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1263: "Indian|Bollywood",
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1264: "Indian|Regional Indian|Tamil",
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1265: "Indian|Regional Indian|Telugu",
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1266: "Indian|Regional Indian",
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1267: "Indian|Devotional & Spiritual",
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1268: "Indian|Sufi",
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1269: "Indian|Indian Classical",
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1270: "Russian|Russian Chanson",
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1271: "World|Dini",
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1272: "Turkish|Halk",
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1273: "Turkish|Sanat",
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1274: "World|Dangdut",
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1275: "World|Indonesian Religious",
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1276: "World|Calypso",
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1277: "World|Soca",
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1278: "Indian|Ghazals",
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1279: "Indian|Indian Folk",
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1280: "Turkish|Arabesque",
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1281: "African|Afrikaans",
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1282: "World|Farsi",
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1283: "World|Israeli",
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1284: "Arabic|Khaleeji",
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1285: "Arabic|North African",
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1286: "Arabic|Arabic Pop",
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1287: "Arabic|Islamic",
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1288: "Soundtrack|Sound Effects",
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1289: "Folk",
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1290: "Orchestral",
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1291: "Marching",
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1293: "Pop|Oldies",
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1294: "Country|Thai Country",
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1295: "World|Flamenco",
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1296: "World|Tango",
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1297: "World|Fado",
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1298: "World|Iberia",
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1299: "Russian",
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1300: "Turkish",
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100000: "Christian & Gospel",
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100001: "Classical|Art Song",
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100002: "Classical|Brass & Woodwinds",
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100003: "Classical|Solo Instrumental",
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100004: "Classical|Contemporary Era",
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100005: "Classical|Oratorio",
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100006: "Classical|Cantata",
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100007: "Classical|Electronic",
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100008: "Classical|Sacred",
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100009: "Classical|Guitar",
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100010: "Classical|Piano",
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100011: "Classical|Violin",
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100012: "Classical|Cello",
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100013: "Classical|Percussion",
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100014: "Electronic|Dubstep",
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100015: "Electronic|Bass",
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100016: "Hip-Hop/Rap|UK Hip-Hop",
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100017: "Reggae|Lovers Rock",
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100018: "Alternative|EMO",
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100019: "Alternative|Pop Punk",
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100020: "Alternative|Indie Pop",
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100021: "New Age|Yoga",
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100022: "Pop|Tribute",
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100023: "Pop|Shows",
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100024: "Cuban",
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100025: "Cuban|Mambo",
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100026: "Cuban|Chachacha",
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100027: "Cuban|Guajira",
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100028: "Cuban|Son",
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100029: "Cuban|Bolero",
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100030: "Cuban|Guaracha",
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100031: "Cuban|Timba",
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100032: "Soundtrack|Video Game",
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100033: "Indian|Regional Indian|Punjabi|Punjabi Pop",
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100034: "Indian|Regional Indian|Bengali|Rabindra Sangeet",
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100035: "Indian|Regional Indian|Malayalam",
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100036: "Indian|Regional Indian|Kannada",
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100037: "Indian|Regional Indian|Marathi",
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100038: "Indian|Regional Indian|Gujarati",
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100039: "Indian|Regional Indian|Assamese",
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100040: "Indian|Regional Indian|Bhojpuri",
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100041: "Indian|Regional Indian|Haryanvi",
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100042: "Indian|Regional Indian|Odia",
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100043: "Indian|Regional Indian|Rajasthani",
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100044: "Indian|Regional Indian|Urdu",
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100045: "Indian|Regional Indian|Punjabi",
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100046: "Indian|Regional Indian|Bengali",
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100047: "Indian|Indian Classical|Carnatic Classical",
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100048: "Indian|Indian Classical|Hindustani Classical",
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100049: "African|Afro House",
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100050: "African|Afro Soul",
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100051: "African|Afrobeats",
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100052: "African|Benga",
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100053: "African|Bongo-Flava",
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100054: "African|Coupe-Decale",
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100055: "African|Gqom",
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100056: "African|Highlife",
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100057: "African|Kuduro",
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100058: "African|Kizomba",
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100059: "African|Kwaito",
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100060: "African|Mbalax",
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100061: "African|Ndombolo",
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100062: "African|Shangaan Electro",
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100063: "African|Soukous",
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100064: "African|Taarab",
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100065: "African|Zouglou",
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100066: "Turkish|Ozgun",
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100067: "Turkish|Fantezi",
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100068: "Turkish|Religious",
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100069: "Pop|Turkish Pop",
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100070: "Rock|Turkish Rock",
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100071: "Alternative|Turkish Alternative",
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100072: "Hip-Hop/Rap|Turkish Hip-Hop/Rap",
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100073: "African|Maskandi",
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100074: "Russian|Russian Romance",
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100075: "Russian|Russian Bard",
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100076: "Russian|Russian Pop",
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100077: "Russian|Russian Rock",
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100078: "Russian|Russian Hip-Hop",
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100079: "Arabic|Levant",
|
|
100080: "Arabic|Levant|Dabke",
|
|
100081: "Arabic|Maghreb Rai",
|
|
100082: "Arabic|Khaleeji|Khaleeji Jalsat",
|
|
100083: "Arabic|Khaleeji|Khaleeji Shailat",
|
|
100084: "Tarab",
|
|
100085: "Tarab|Iraqi Tarab",
|
|
100086: "Tarab|Egyptian Tarab",
|
|
100087: "Tarab|Khaleeji Tarab",
|
|
100088: "Pop|Levant Pop",
|
|
100089: "Pop|Iraqi Pop",
|
|
100090: "Pop|Egyptian Pop",
|
|
100091: "Pop|Maghreb Pop",
|
|
100092: "Pop|Khaleeji Pop",
|
|
100093: "Hip-Hop/Rap|Levant Hip-Hop",
|
|
100094: "Hip-Hop/Rap|Egyptian Hip-Hop",
|
|
100095: "Hip-Hop/Rap|Maghreb Hip-Hop",
|
|
100096: "Hip-Hop/Rap|Khaleeji Hip-Hop",
|
|
100097: "Alternative|Indie Levant",
|
|
100098: "Alternative|Indie Egyptian",
|
|
100099: "Alternative|Indie Maghreb",
|
|
100100: "Electronic|Levant Electronic",
|
|
100101: "Electronic|Electro-Cha'abi",
|
|
100102: "Electronic|Maghreb Electronic",
|
|
100103: "Folk|Iraqi Folk",
|
|
100104: "Folk|Khaleeji Folk",
|
|
100105: "Dance|Maghreb Dance",
|
|
50000061: "Spoken Word",
|
|
50000063: "Disney",
|
|
50000064: "French Pop",
|
|
50000066: "German Pop",
|
|
50000068: "German Folk",
|
|
}
|
|
|
|
// Detect PNG image if "implicit" class is used
|
|
var pngHeader = []byte{137, 80, 78, 71, 13, 10, 26, 10}
|
|
|
|
type atomNames map[string]string
|
|
|
|
func (f atomNames) Name(n string) []string {
|
|
res := make([]string, 1)
|
|
for k, v := range f {
|
|
if v == n {
|
|
res = append(res, k)
|
|
}
|
|
}
|
|
return res
|
|
}
|
|
|
|
// metadataMP4 is the implementation of Metadata for MP4 tag (atom) data.
|
|
type metadataMP4 struct {
|
|
fileType FileType
|
|
data map[string]interface{}
|
|
}
|
|
|
|
// ReadAtoms reads MP4 metadata atoms from the io.ReadSeeker into a Metadata, returning
|
|
// non-nil error if there was a problem.
|
|
func ReadAtoms(r io.ReadSeeker) (Metadata, error) {
|
|
m := metadataMP4{
|
|
data: make(map[string]interface{}),
|
|
fileType: UnknownFileType,
|
|
}
|
|
err := m.readAtoms(r)
|
|
return m, err
|
|
}
|
|
|
|
func (m metadataMP4) readAtoms(r io.ReadSeeker) error {
|
|
for {
|
|
name, size, err := readAtomHeader(r)
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
switch name {
|
|
case "meta":
|
|
// next_item_id (int32)
|
|
_, err := readBytes(r, 4)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fallthrough
|
|
|
|
case "moov", "udta", "ilst":
|
|
return m.readAtoms(r)
|
|
}
|
|
|
|
_, ok := atoms[name]
|
|
var data []string
|
|
if name == "----" {
|
|
name, data, err = readCustomAtom(r, size)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if name != "----" {
|
|
ok = true
|
|
size = 0 // already read data
|
|
}
|
|
}
|
|
|
|
if !ok {
|
|
_, err := r.Seek(int64(size-8), io.SeekCurrent)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
continue
|
|
}
|
|
|
|
err = m.readAtomData(r, name, size-8, data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
func (m metadataMP4) readAtomData(r io.ReadSeeker, name string, size uint32, processedData []string) error {
|
|
var b []byte
|
|
var err error
|
|
var contentType string
|
|
if len(processedData) > 0 {
|
|
b = []byte(strings.Join(processedData, ";")) // add delimiter if multiple data fields
|
|
contentType = "text"
|
|
} else {
|
|
// read the data
|
|
b, err = readBytes(r, uint(size))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(b) < 8 {
|
|
return fmt.Errorf("invalid encoding: expected at least %d bytes, got %d", 8, len(b))
|
|
}
|
|
|
|
// "data" + size (4 bytes each)
|
|
b = b[8:]
|
|
if len(b) < 4 {
|
|
return fmt.Errorf("invalid encoding: expected at least %d bytes, for class, got %d", 4, len(b))
|
|
}
|
|
|
|
if name == "gnre" {
|
|
m.data[name] = getInt(b[len(b)-1:])
|
|
return nil
|
|
}
|
|
|
|
class := getInt(b[1:4])
|
|
var ok bool
|
|
contentType, ok = atomTypes[class]
|
|
if !ok {
|
|
return fmt.Errorf("invalid content type: %v (%x) (%x)", class, b[1:4], b)
|
|
}
|
|
|
|
// 4: atom version (1 byte) + atom flags (3 bytes)
|
|
// 4: NULL (usually locale indicator)
|
|
if len(b) < 8 {
|
|
return fmt.Errorf("invalid encoding: expected at least %d bytes, for atom version and flags, got %d", 8, len(b))
|
|
}
|
|
b = b[8:]
|
|
}
|
|
|
|
if name == "trkn" || name == "disk" {
|
|
if len(b) < 6 {
|
|
return fmt.Errorf("invalid encoding: expected at least %d bytes, for track and disk numbers, got %d", 6, len(b))
|
|
}
|
|
|
|
m.data[name] = int(b[3])
|
|
m.data[name+"_count"] = int(b[5])
|
|
return nil
|
|
}
|
|
|
|
if contentType == "implicit" {
|
|
if name == "covr" {
|
|
if bytes.HasPrefix(b, pngHeader) {
|
|
contentType = "png"
|
|
}
|
|
// TODO(dhowden): Detect JPEG formats too (harder).
|
|
}
|
|
}
|
|
|
|
var data interface{}
|
|
switch contentType {
|
|
case "implicit":
|
|
if _, ok := atoms[name]; ok {
|
|
return fmt.Errorf("unhandled implicit content type for required atom: %q", name)
|
|
}
|
|
return nil
|
|
|
|
case "text":
|
|
data = string(b)
|
|
|
|
case "uint8":
|
|
if len(b) == 0 {
|
|
return fmt.Errorf("invalid encoding: expected at least %d bytes, for integer tag data, got %d", 1, len(b))
|
|
}
|
|
data = getInt(b[len(b)-1:])
|
|
|
|
case "jpeg", "png":
|
|
data = &Picture{
|
|
Ext: contentType,
|
|
MIMEType: "image/" + contentType,
|
|
Data: b,
|
|
}
|
|
}
|
|
m.data[name] = data
|
|
|
|
return nil
|
|
}
|
|
|
|
func readAtomHeader(r io.ReadSeeker) (name string, size uint32, err error) {
|
|
err = binary.Read(r, binary.BigEndian, &size)
|
|
if err != nil {
|
|
return
|
|
}
|
|
name, err = readString(r, 4)
|
|
return
|
|
}
|
|
|
|
// Generic atom.
|
|
// Should have 3 sub atoms : mean, name and data.
|
|
// We check that mean is "com.apple.iTunes" and we use the subname as
|
|
// the name, and move to the data atom.
|
|
// Data atom could have multiple data values, each with a header.
|
|
// If anything goes wrong, we jump at the end of the "----" atom.
|
|
func readCustomAtom(r io.ReadSeeker, size uint32) (_ string, data []string, _ error) {
|
|
subNames := make(map[string]string)
|
|
|
|
for size > 8 {
|
|
subName, subSize, err := readAtomHeader(r)
|
|
if err != nil {
|
|
return "", nil, err
|
|
}
|
|
|
|
// Remove the size of the atom from the size counter
|
|
if size >= subSize {
|
|
size -= subSize
|
|
} else {
|
|
return "", nil, errors.New("--- invalid size")
|
|
}
|
|
|
|
b, err := readBytes(r, uint(subSize-8))
|
|
if err != nil {
|
|
return "", nil, err
|
|
}
|
|
|
|
if len(b) < 4 {
|
|
return "", nil, fmt.Errorf("invalid encoding: expected at least %d bytes, got %d", 4, len(b))
|
|
}
|
|
switch subName {
|
|
case "mean", "name":
|
|
subNames[subName] = string(b[4:])
|
|
case "data":
|
|
data = append(data, string(b[4:]))
|
|
}
|
|
}
|
|
|
|
// there should remain only the header size
|
|
if size != 8 {
|
|
err := errors.New("---- atom out of bounds")
|
|
return "", nil, err
|
|
}
|
|
|
|
if subNames["mean"] != "com.apple.iTunes" || subNames["name"] == "" || len(data) == 0 {
|
|
return "----", nil, nil
|
|
}
|
|
return subNames["name"], data, nil
|
|
}
|
|
|
|
func (metadataMP4) Format() Format { return MP4 }
|
|
func (m metadataMP4) FileType() FileType { return m.fileType }
|
|
|
|
func (m metadataMP4) Raw() map[string]interface{} { return m.data }
|
|
|
|
func (m metadataMP4) getString(n []string) string {
|
|
for _, k := range n {
|
|
if x, ok := m.data[k]; ok {
|
|
return x.(string)
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func (m metadataMP4) getInt(n []string) int {
|
|
for _, k := range n {
|
|
if x, ok := m.data[k]; ok {
|
|
return x.(int)
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (m metadataMP4) Title() string {
|
|
return m.getString(atoms.Name("title"))
|
|
}
|
|
|
|
func (m metadataMP4) Artist() string {
|
|
return m.getString(atoms.Name("artist"))
|
|
}
|
|
|
|
func (m metadataMP4) Album() string {
|
|
return m.getString(atoms.Name("album"))
|
|
}
|
|
|
|
func (m metadataMP4) AlbumArtist() string {
|
|
return m.getString(atoms.Name("album_artist"))
|
|
}
|
|
|
|
func (m metadataMP4) Composer() string {
|
|
return m.getString(atoms.Name("composer"))
|
|
}
|
|
|
|
func (m metadataMP4) Genre() string {
|
|
genre := m.getString(atoms.Name("genre"))
|
|
if len(genre) == 0 {
|
|
genreID := m.getInt(atoms.Name("genre ID"))
|
|
if genreID == 0 {
|
|
genreID := m.getInt(atoms.Name("genre ID3v1 ID")) - 1
|
|
genre = id3v1Genres[genreID]
|
|
} else {
|
|
genre = genreIDValues[genreID]
|
|
}
|
|
}
|
|
return genre
|
|
}
|
|
|
|
func (m metadataMP4) Year() int {
|
|
date := m.getString(atoms.Name("year"))
|
|
if len(date) >= 4 {
|
|
year, _ := strconv.Atoi(date[:4])
|
|
return year
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (m metadataMP4) Track() (int, int) {
|
|
x := m.getInt([]string{"trkn"})
|
|
if n, ok := m.data["trkn_count"]; ok {
|
|
return x, n.(int)
|
|
}
|
|
return x, 0
|
|
}
|
|
|
|
func (m metadataMP4) Disc() (int, int) {
|
|
x := m.getInt([]string{"disk"})
|
|
if n, ok := m.data["disk_count"]; ok {
|
|
return x, n.(int)
|
|
}
|
|
return x, 0
|
|
}
|
|
|
|
func (m metadataMP4) Lyrics() string {
|
|
t, ok := m.data["\xa9lyr"]
|
|
if !ok {
|
|
return ""
|
|
}
|
|
return t.(string)
|
|
}
|
|
|
|
func (m metadataMP4) Comment() string {
|
|
t, ok := m.data["\xa9cmt"]
|
|
if !ok {
|
|
return ""
|
|
}
|
|
return t.(string)
|
|
}
|
|
|
|
func (m metadataMP4) Picture() *Picture {
|
|
v, ok := m.data["covr"]
|
|
if !ok {
|
|
return nil
|
|
}
|
|
p, _ := v.(*Picture)
|
|
return p
|
|
}
|