FFmpeg: libavformat/id3v1.c Source File

00001 /*
00002  * ID3v1 header parser
00003  * Copyright (c) 2003 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "id3v1.h"
00023 #include "libavcodec/avcodec.h"
00024 #include "libavutil/dict.h"
00025 
00026 const char * const ff_id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
00027       [0] = "Blues",
00028       [1] = "Classic Rock",
00029       [2] = "Country",
00030       [3] = "Dance",
00031       [4] = "Disco",
00032       [5] = "Funk",
00033       [6] = "Grunge",
00034       [7] = "Hip-Hop",
00035       [8] = "Jazz",
00036       [9] = "Metal",
00037      [10] = "New Age",
00038      [11] = "Oldies",
00039      [12] = "Other",
00040      [13] = "Pop",
00041      [14] = "R&B",
00042      [15] = "Rap",
00043      [16] = "Reggae",
00044      [17] = "Rock",
00045      [18] = "Techno",
00046      [19] = "Industrial",
00047      [20] = "Alternative",
00048      [21] = "Ska",
00049      [22] = "Death Metal",
00050      [23] = "Pranks",
00051      [24] = "Soundtrack",
00052      [25] = "Euro-Techno",
00053      [26] = "Ambient",
00054      [27] = "Trip-Hop",
00055      [28] = "Vocal",
00056      [29] = "Jazz+Funk",
00057      [30] = "Fusion",
00058      [31] = "Trance",
00059      [32] = "Classical",
00060      [33] = "Instrumental",
00061      [34] = "Acid",
00062      [35] = "House",
00063      [36] = "Game",
00064      [37] = "Sound Clip",
00065      [38] = "Gospel",
00066      [39] = "Noise",
00067      [40] = "AlternRock",
00068      [41] = "Bass",
00069      [42] = "Soul",
00070      [43] = "Punk",
00071      [44] = "Space",
00072      [45] = "Meditative",
00073      [46] = "Instrumental Pop",
00074      [47] = "Instrumental Rock",
00075      [48] = "Ethnic",
00076      [49] = "Gothic",
00077      [50] = "Darkwave",
00078      [51] = "Techno-Industrial",
00079      [52] = "Electronic",
00080      [53] = "Pop-Folk",
00081      [54] = "Eurodance",
00082      [55] = "Dream",
00083      [56] = "Southern Rock",
00084      [57] = "Comedy",
00085      [58] = "Cult",
00086      [59] = "Gangsta",
00087      [60] = "Top 40",
00088      [61] = "Christian Rap",
00089      [62] = "Pop/Funk",
00090      [63] = "Jungle",
00091      [64] = "Native American",
00092      [65] = "Cabaret",
00093      [66] = "New Wave",
00094      [67] = "Psychadelic",
00095      [68] = "Rave",
00096      [69] = "Showtunes",
00097      [70] = "Trailer",
00098      [71] = "Lo-Fi",
00099      [72] = "Tribal",
00100      [73] = "Acid Punk",
00101      [74] = "Acid Jazz",
00102      [75] = "Polka",
00103      [76] = "Retro",
00104      [77] = "Musical",
00105      [78] = "Rock & Roll",
00106      [79] = "Hard Rock",
00107      [80] = "Folk",
00108      [81] = "Folk-Rock",
00109      [82] = "National Folk",
00110      [83] = "Swing",
00111      [84] = "Fast Fusion",
00112      [85] = "Bebob",
00113      [86] = "Latin",
00114      [87] = "Revival",
00115      [88] = "Celtic",
00116      [89] = "Bluegrass",
00117      [90] = "Avantgarde",
00118      [91] = "Gothic Rock",
00119      [92] = "Progressive Rock",
00120      [93] = "Psychedelic Rock",
00121      [94] = "Symphonic Rock",
00122      [95] = "Slow Rock",
00123      [96] = "Big Band",
00124      [97] = "Chorus",
00125      [98] = "Easy Listening",
00126      [99] = "Acoustic",
00127     [100] = "Humour",
00128     [101] = "Speech",
00129     [102] = "Chanson",
00130     [103] = "Opera",
00131     [104] = "Chamber Music",
00132     [105] = "Sonata",
00133     [106] = "Symphony",
00134     [107] = "Booty Bass",
00135     [108] = "Primus",
00136     [109] = "Porn Groove",
00137     [110] = "Satire",
00138     [111] = "Slow Jam",
00139     [112] = "Club",
00140     [113] = "Tango",
00141     [114] = "Samba",
00142     [115] = "Folklore",
00143     [116] = "Ballad",
00144     [117] = "Power Ballad",
00145     [118] = "Rhythmic Soul",
00146     [119] = "Freestyle",
00147     [120] = "Duet",
00148     [121] = "Punk Rock",
00149     [122] = "Drum Solo",
00150     [123] = "A capella",
00151     [124] = "Euro-House",
00152     [125] = "Dance Hall",
00153     [126] = "Goa",
00154     [127] = "Drum & Bass",
00155     [128] = "Club-House",
00156     [129] = "Hardcore",
00157     [130] = "Terror",
00158     [131] = "Indie",
00159     [132] = "BritPop",
00160     [133] = "Negerpunk",
00161     [134] = "Polsk Punk",
00162     [135] = "Beat",
00163     [136] = "Christian Gangsta",
00164     [137] = "Heavy Metal",
00165     [138] = "Black Metal",
00166     [139] = "Crossover",
00167     [140] = "Contemporary Christian",
00168     [141] = "Christian Rock",
00169     [142] = "Merengue",
00170     [143] = "Salsa",
00171     [144] = "Thrash Metal",
00172     [145] = "Anime",
00173     [146] = "JPop",
00174     [147] = "SynthPop",
00175 };
00176 
00177 static void get_string(AVFormatContext *s, const char *key,
00178                        const uint8_t *buf, int buf_size)
00179 {
00180     int i, c;
00181     char *q, str[512];
00182 
00183     q = str;
00184     for(i = 0; i < buf_size; i++) {
00185         c = buf[i];
00186         if (c == '\0')
00187             break;
00188         if ((q - str) >= sizeof(str) - 1)
00189             break;
00190         *q++ = c;
00191     }
00192     *q = '\0';
00193 
00194     if (*str)
00195         av_dict_set(&s->metadata, key, str, 0);
00196 }
00197 
00203 static int parse_tag(AVFormatContext *s, const uint8_t *buf)
00204 {
00205     char str[5];
00206     int genre;
00207 
00208     if (!(buf[0] == 'T' &&
00209           buf[1] == 'A' &&
00210           buf[2] == 'G'))
00211         return -1;
00212     get_string(s, "title",   buf +  3, 30);
00213     get_string(s, "artist",  buf + 33, 30);
00214     get_string(s, "album",   buf + 63, 30);
00215     get_string(s, "date",    buf + 93,  4);
00216     get_string(s, "comment", buf + 97, 30);
00217     if (buf[125] == 0 && buf[126] != 0) {
00218         snprintf(str, sizeof(str), "%d", buf[126]);
00219         av_dict_set(&s->metadata, "track", str, 0);
00220     }
00221     genre = buf[127];
00222     if (genre <= ID3v1_GENRE_MAX)
00223         av_dict_set(&s->metadata, "genre", ff_id3v1_genre_str[genre], 0);
00224     return 0;
00225 }
00226 
00227 void ff_id3v1_read(AVFormatContext *s)
00228 {
00229     int ret;
00230     uint8_t buf[ID3v1_TAG_SIZE];
00231     int64_t filesize, position = avio_tell(s->pb);
00232 
00233     if (s->pb->seekable) {
00234         /* XXX: change that */
00235         filesize = avio_size(s->pb);
00236         if (filesize > 128) {
00237             avio_seek(s->pb, filesize - 128, SEEK_SET);
00238             ret = avio_read(s->pb, buf, ID3v1_TAG_SIZE);
00239             if (ret == ID3v1_TAG_SIZE) {
00240                 parse_tag(s, buf);
00241             }
00242             avio_seek(s->pb, position, SEEK_SET);
00243         }
00244     }
00245 }