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  1. /*
  2.  * ID3v1 header parser
  3.  * Copyright (c) 2003 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "id3v1.h"
  23. #include "libavcodec/avcodec.h"
  24. #include "libavutil/dict.h"
  25.  
  26. /* See Genre List at http://id3.org/id3v2.3.0 */
  27. const char * const ff_id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
  28.       [0] = "Blues",
  29.       [1] = "Classic Rock",
  30.       [2] = "Country",
  31.       [3] = "Dance",
  32.       [4] = "Disco",
  33.       [5] = "Funk",
  34.       [6] = "Grunge",
  35.       [7] = "Hip-Hop",
  36.       [8] = "Jazz",
  37.       [9] = "Metal",
  38.      [10] = "New Age",
  39.      [11] = "Oldies",
  40.      [12] = "Other",
  41.      [13] = "Pop",
  42.      [14] = "R&B",
  43.      [15] = "Rap",
  44.      [16] = "Reggae",
  45.      [17] = "Rock",
  46.      [18] = "Techno",
  47.      [19] = "Industrial",
  48.      [20] = "Alternative",
  49.      [21] = "Ska",
  50.      [22] = "Death Metal",
  51.      [23] = "Pranks",
  52.      [24] = "Soundtrack",
  53.      [25] = "Euro-Techno",
  54.      [26] = "Ambient",
  55.      [27] = "Trip-Hop",
  56.      [28] = "Vocal",
  57.      [29] = "Jazz+Funk",
  58.      [30] = "Fusion",
  59.      [31] = "Trance",
  60.      [32] = "Classical",
  61.      [33] = "Instrumental",
  62.      [34] = "Acid",
  63.      [35] = "House",
  64.      [36] = "Game",
  65.      [37] = "Sound Clip",
  66.      [38] = "Gospel",
  67.      [39] = "Noise",
  68.      [40] = "AlternRock",
  69.      [41] = "Bass",
  70.      [42] = "Soul",
  71.      [43] = "Punk",
  72.      [44] = "Space",
  73.      [45] = "Meditative",
  74.      [46] = "Instrumental Pop",
  75.      [47] = "Instrumental Rock",
  76.      [48] = "Ethnic",
  77.      [49] = "Gothic",
  78.      [50] = "Darkwave",
  79.      [51] = "Techno-Industrial",
  80.      [52] = "Electronic",
  81.      [53] = "Pop-Folk",
  82.      [54] = "Eurodance",
  83.      [55] = "Dream",
  84.      [56] = "Southern Rock",
  85.      [57] = "Comedy",
  86.      [58] = "Cult",
  87.      [59] = "Gangsta",
  88.      [60] = "Top 40",
  89.      [61] = "Christian Rap",
  90.      [62] = "Pop/Funk",
  91.      [63] = "Jungle",
  92.      [64] = "Native American",
  93.      [65] = "Cabaret",
  94.      [66] = "New Wave",
  95.      [67] = "Psychadelic", /* sic, the misspelling is used in the specification */
  96.      [68] = "Rave",
  97.      [69] = "Showtunes",
  98.      [70] = "Trailer",
  99.      [71] = "Lo-Fi",
  100.      [72] = "Tribal",
  101.      [73] = "Acid Punk",
  102.      [74] = "Acid Jazz",
  103.      [75] = "Polka",
  104.      [76] = "Retro",
  105.      [77] = "Musical",
  106.      [78] = "Rock & Roll",
  107.      [79] = "Hard Rock",
  108.      [80] = "Folk",
  109.      [81] = "Folk-Rock",
  110.      [82] = "National Folk",
  111.      [83] = "Swing",
  112.      [84] = "Fast Fusion",
  113.      [85] = "Bebob",
  114.      [86] = "Latin",
  115.      [87] = "Revival",
  116.      [88] = "Celtic",
  117.      [89] = "Bluegrass",
  118.      [90] = "Avantgarde",
  119.      [91] = "Gothic Rock",
  120.      [92] = "Progressive Rock",
  121.      [93] = "Psychedelic Rock",
  122.      [94] = "Symphonic Rock",
  123.      [95] = "Slow Rock",
  124.      [96] = "Big Band",
  125.      [97] = "Chorus",
  126.      [98] = "Easy Listening",
  127.      [99] = "Acoustic",
  128.     [100] = "Humour",
  129.     [101] = "Speech",
  130.     [102] = "Chanson",
  131.     [103] = "Opera",
  132.     [104] = "Chamber Music",
  133.     [105] = "Sonata",
  134.     [106] = "Symphony",
  135.     [107] = "Booty Bass",
  136.     [108] = "Primus",
  137.     [109] = "Porn Groove",
  138.     [110] = "Satire",
  139.     [111] = "Slow Jam",
  140.     [112] = "Club",
  141.     [113] = "Tango",
  142.     [114] = "Samba",
  143.     [115] = "Folklore",
  144.     [116] = "Ballad",
  145.     [117] = "Power Ballad",
  146.     [118] = "Rhythmic Soul",
  147.     [119] = "Freestyle",
  148.     [120] = "Duet",
  149.     [121] = "Punk Rock",
  150.     [122] = "Drum Solo",
  151.     [123] = "A capella",
  152.     [124] = "Euro-House",
  153.     [125] = "Dance Hall",
  154.     [126] = "Goa",
  155.     [127] = "Drum & Bass",
  156.     [128] = "Club-House",
  157.     [129] = "Hardcore",
  158.     [130] = "Terror",
  159.     [131] = "Indie",
  160.     [132] = "BritPop",
  161.     [133] = "Negerpunk",
  162.     [134] = "Polsk Punk",
  163.     [135] = "Beat",
  164.     [136] = "Christian Gangsta",
  165.     [137] = "Heavy Metal",
  166.     [138] = "Black Metal",
  167.     [139] = "Crossover",
  168.     [140] = "Contemporary Christian",
  169.     [141] = "Christian Rock",
  170.     [142] = "Merengue",
  171.     [143] = "Salsa",
  172.     [144] = "Thrash Metal",
  173.     [145] = "Anime",
  174.     [146] = "JPop",
  175.     [147] = "SynthPop",
  176. };
  177.  
  178. static void get_string(AVFormatContext *s, const char *key,
  179.                        const uint8_t *buf, int buf_size)
  180. {
  181.     int i, c;
  182.     char *q, str[512];
  183.  
  184.     q = str;
  185.     for(i = 0; i < buf_size; i++) {
  186.         c = buf[i];
  187.         if (c == '\0')
  188.             break;
  189.         if ((q - str) >= sizeof(str) - 1)
  190.             break;
  191.         *q++ = c;
  192.     }
  193.     *q = '\0';
  194.  
  195.     if (*str)
  196.         av_dict_set(&s->metadata, key, str, 0);
  197. }
  198.  
  199. /**
  200.  * Parse an ID3v1 tag
  201.  *
  202.  * @param buf ID3v1_TAG_SIZE long buffer containing the tag
  203.  */
  204. static int parse_tag(AVFormatContext *s, const uint8_t *buf)
  205. {
  206.     char str[5];
  207.     int genre;
  208.  
  209.     if (!(buf[0] == 'T' &&
  210.           buf[1] == 'A' &&
  211.           buf[2] == 'G'))
  212.         return -1;
  213.     get_string(s, "title",   buf +  3, 30);
  214.     get_string(s, "artist",  buf + 33, 30);
  215.     get_string(s, "album",   buf + 63, 30);
  216.     get_string(s, "date",    buf + 93,  4);
  217.     get_string(s, "comment", buf + 97, 30);
  218.     if (buf[125] == 0 && buf[126] != 0) {
  219.         snprintf(str, sizeof(str), "%d", buf[126]);
  220.         av_dict_set(&s->metadata, "track", str, 0);
  221.     }
  222.     genre = buf[127];
  223.     if (genre <= ID3v1_GENRE_MAX)
  224.         av_dict_set(&s->metadata, "genre", ff_id3v1_genre_str[genre], 0);
  225.     return 0;
  226. }
  227.  
  228. void ff_id3v1_read(AVFormatContext *s)
  229. {
  230.     int ret;
  231.     uint8_t buf[ID3v1_TAG_SIZE];
  232.     int64_t filesize, position = avio_tell(s->pb);
  233.  
  234.     if (s->pb->seekable) {
  235.         /* XXX: change that */
  236.         filesize = avio_size(s->pb);
  237.         if (filesize > 128) {
  238.             avio_seek(s->pb, filesize - 128, SEEK_SET);
  239.             ret = avio_read(s->pb, buf, ID3v1_TAG_SIZE);
  240.             if (ret == ID3v1_TAG_SIZE) {
  241.                 parse_tag(s, buf);
  242.             }
  243.             avio_seek(s->pb, position, SEEK_SET);
  244.         }
  245.     }
  246. }
  247.