libavformat/id3v1.c

   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
  25 const char * const ff_id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
  26       [0] = "Blues",
  27       [1] = "Classic Rock",
  28       [2] = "Country",
  29       [3] = "Dance",
  30       [4] = "Disco",
  31       [5] = "Funk",
  32       [6] = "Grunge",
  33       [7] = "Hip-Hop",
  34       [8] = "Jazz",
  35       [9] = "Metal",
  36      [10] = "New Age",
  37      [11] = "Oldies",
  38      [12] = "Other",
  39      [13] = "Pop",
  40      [14] = "R&B",
  41      [15] = "Rap",
  42      [16] = "Reggae",
  43      [17] = "Rock",
  44      [18] = "Techno",
  45      [19] = "Industrial",
  46      [20] = "Alternative",
  47      [21] = "Ska",
  48      [22] = "Death Metal",
  49      [23] = "Pranks",
  50      [24] = "Soundtrack",
  51      [25] = "Euro-Techno",
  52      [26] = "Ambient",
  53      [27] = "Trip-Hop",
  54      [28] = "Vocal",
  55      [29] = "Jazz+Funk",
  56      [30] = "Fusion",
  57      [31] = "Trance",
  58      [32] = "Classical",
  59      [33] = "Instrumental",
  60      [34] = "Acid",
  61      [35] = "House",
  62      [36] = "Game",
  63      [37] = "Sound Clip",
  64      [38] = "Gospel",
  65      [39] = "Noise",
  66      [40] = "AlternRock",
  67      [41] = "Bass",
  68      [42] = "Soul",
  69      [43] = "Punk",
  70      [44] = "Space",
  71      [45] = "Meditative",
  72      [46] = "Instrumental Pop",
  73      [47] = "Instrumental Rock",
  74      [48] = "Ethnic",
  75      [49] = "Gothic",
  76      [50] = "Darkwave",
  77      [51] = "Techno-Industrial",
  78      [52] = "Electronic",
  79      [53] = "Pop-Folk",
  80      [54] = "Eurodance",
  81      [55] = "Dream",
  82      [56] = "Southern Rock",
  83      [57] = "Comedy",
  84      [58] = "Cult",
  85      [59] = "Gangsta",
  86      [60] = "Top 40",
  87      [61] = "Christian Rap",
  88      [62] = "Pop/Funk",
  89      [63] = "Jungle",
  90      [64] = "Native American",
  91      [65] = "Cabaret",
  92      [66] = "New Wave",
  93      [67] = "Psychadelic",
  94      [68] = "Rave",
  95      [69] = "Showtunes",
  96      [70] = "Trailer",
  97      [71] = "Lo-Fi",
  98      [72] = "Tribal",
  99      [73] = "Acid Punk",
 100      [74] = "Acid Jazz",
 101      [75] = "Polka",
 102      [76] = "Retro",
 103      [77] = "Musical",
 104      [78] = "Rock & Roll",
 105      [79] = "Hard Rock",
 106      [80] = "Folk",
 107      [81] = "Folk-Rock",
 108      [82] = "National Folk",
 109      [83] = "Swing",
 110      [84] = "Fast Fusion",
 111      [85] = "Bebob",
 112      [86] = "Latin",
 113      [87] = "Revival",
 114      [88] = "Celtic",
 115      [89] = "Bluegrass",
 116      [90] = "Avantgarde",
 117      [91] = "Gothic Rock",
 118      [92] = "Progressive Rock",
 119      [93] = "Psychedelic Rock",
 120      [94] = "Symphonic Rock",
 121      [95] = "Slow Rock",
 122      [96] = "Big Band",
 123      [97] = "Chorus",
 124      [98] = "Easy Listening",
 125      [99] = "Acoustic",
 126     [100] = "Humour",
 127     [101] = "Speech",
 128     [102] = "Chanson",
 129     [103] = "Opera",
 130     [104] = "Chamber Music",
 131     [105] = "Sonata",
 132     [106] = "Symphony",
 133     [107] = "Booty Bass",
 134     [108] = "Primus",
 135     [109] = "Porn Groove",
 136     [110] = "Satire",
 137     [111] = "Slow Jam",
 138     [112] = "Club",
 139     [113] = "Tango",
 140     [114] = "Samba",
 141     [115] = "Folklore",
 142     [116] = "Ballad",
 143     [117] = "Power Ballad",
 144     [118] = "Rhythmic Soul",
 145     [119] = "Freestyle",
 146     [120] = "Duet",
 147     [121] = "Punk Rock",
 148     [122] = "Drum Solo",
 149     [123] = "A capella",
 150     [124] = "Euro-House",
 151     [125] = "Dance Hall",
 152 };
 153
 154 static void get_string(AVFormatContext *s, const char *key,
 155                        const uint8_t *buf, int buf_size)
 156 {
 157     int i, c;
 158     char *q, str[512];
 159
 160     q = str;
 161     for(i = 0; i < buf_size; i++) {
 162         c = buf[i];
 163         if (c == '\0')
 164             break;
 165         if ((q - str) >= sizeof(str) - 1)
 166             break;
 167         *q++ = c;
 168     }
 169     *q = '\0';
 170
 171     if (*str)
 172         av_metadata_set(&s->metadata, key, str);
 173 }
 174
 175 /**
 176  * Parse an ID3v1 tag
 177  *
 178  * @param buf ID3v1_TAG_SIZE long buffer containing the tag
 179  */
 180 static int parse_tag(AVFormatContext *s, const uint8_t *buf)
 181 {
 182     char str[5];
 183     int genre;
 184
 185     if (!(buf[0] == 'T' &&
 186           buf[1] == 'A' &&
 187           buf[2] == 'G'))
 188         return -1;
 189     get_string(s, "title",   buf +  3, 30);
 190     get_string(s, "author",  buf + 33, 30);
 191     get_string(s, "album",   buf + 63, 30);
 192     get_string(s, "year",    buf + 93,  4);
 193     get_string(s, "comment", buf + 97, 30);
 194     if (buf[125] == 0 && buf[126] != 0) {
 195         snprintf(str, sizeof(str), "%d", buf[126]);
 196         av_metadata_set(&s->metadata, "track", str);
 197     }
 198     genre = buf[127];
 199     if (genre <= ID3v1_GENRE_MAX)
 200         av_metadata_set(&s->metadata, "genre", ff_id3v1_genre_str[genre]);
 201     return 0;
 202 }
 203
 204 void ff_id3v1_read(AVFormatContext *s)
 205 {
 206     int ret, filesize;
 207     uint8_t buf[ID3v1_TAG_SIZE];
 208
 209     if (!url_is_streamed(s->pb)) {
 210         /* XXX: change that */
 211         filesize = url_fsize(s->pb);
 212         if (filesize > 128) {
 213             url_fseek(s->pb, filesize - 128, SEEK_SET);
 214             ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
 215             if (ret == ID3v1_TAG_SIZE) {
 216                 parse_tag(s, buf);
 217             }
 218             url_fseek(s->pb, 0, SEEK_SET);
 219         }
 220     }
 221 }