libavformat/id3v2.c

   1 /*
   2  * ID3v2 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 "id3v2.h"
  23 #include "id3v1.h"
  24 #include "libavutil/avstring.h"
  25
  26 int ff_id3v2_match(const uint8_t *buf)
  27 {
  28     return  buf[0]         ==  'I' &&
  29             buf[1]         ==  'D' &&
  30             buf[2]         ==  '3' &&
  31             buf[3]         != 0xff &&
  32             buf[4]         != 0xff &&
  33            (buf[6] & 0x80) ==    0 &&
  34            (buf[7] & 0x80) ==    0 &&
  35            (buf[8] & 0x80) ==    0 &&
  36            (buf[9] & 0x80) ==    0;
  37 }
  38
  39 int ff_id3v2_tag_len(const uint8_t * buf)
  40 {
  41     int len = ((buf[6] & 0x7f) << 21) +
  42               ((buf[7] & 0x7f) << 14) +
  43               ((buf[8] & 0x7f) << 7) +
  44                (buf[9] & 0x7f) +
  45               ID3v2_HEADER_SIZE;
  46     if (buf[5] & 0x10)
  47         len += ID3v2_HEADER_SIZE;
  48     return len;
  49 }
  50
  51 void ff_id3v2_read(AVFormatContext *s)
  52 {
  53     int len, ret;
  54     uint8_t buf[ID3v2_HEADER_SIZE];
  55
  56     ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
  57     if (ret != ID3v2_HEADER_SIZE)
  58         return;
  59     if (ff_id3v2_match(buf)) {
  60         /* parse ID3v2 header */
  61         len = ((buf[6] & 0x7f) << 21) |
  62             ((buf[7] & 0x7f) << 14) |
  63             ((buf[8] & 0x7f) << 7) |
  64             (buf[9] & 0x7f);
  65         ff_id3v2_parse(s, len, buf[3], buf[5]);
  66     } else {
  67         url_fseek(s->pb, 0, SEEK_SET);
  68     }
  69 }
  70
  71 static unsigned int get_size(ByteIOContext *s, int len)
  72 {
  73     int v = 0;
  74     while (len--)
  75         v = (v << 7) + (get_byte(s) & 0x7F);
  76     return v;
  77 }
  78
  79 static void read_ttag(AVFormatContext *s, int taglen, const char *key)
  80 {
  81     char *q, dst[512];
  82     int len, dstlen = sizeof(dst) - 1;
  83     unsigned genre;
  84     unsigned int (*get)(ByteIOContext*) = get_be16;
  85
  86     dst[0] = 0;
  87     if (taglen < 1)
  88         return;
  89
  90     taglen--; /* account for encoding type byte */
  91
  92     switch (get_byte(s->pb)) { /* encoding type */
  93
  94     case 0:  /* ISO-8859-1 (0 - 255 maps directly into unicode) */
  95         q = dst;
  96         while (taglen-- && q - dst < dstlen - 7) {
  97             uint8_t tmp;
  98             PUT_UTF8(get_byte(s->pb), tmp, *q++ = tmp;)
  99         }
 100         *q = 0;
 101         break;
 102
 103     case 1:  /* UTF-16 with BOM */
 104         taglen -= 2;
 105         switch (get_be16(s->pb)) {
 106         case 0xfffe:
 107             get = get_le16;
 108         case 0xfeff:
 109             break;
 110         default:
 111             av_log(s, AV_LOG_ERROR, "Incorrect BOM value in tag %s.\n", key);
 112             return;
 113         }
 114         // fall-through
 115
 116     case 2:  /* UTF-16BE without BOM */
 117         q = dst;
 118         while (taglen > 1 && q - dst < dstlen - 7) {
 119             uint32_t ch;
 120             uint8_t tmp;
 121
 122             GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(s->pb) : 0), break;)
 123             PUT_UTF8(ch, tmp, *q++ = tmp;)
 124         }
 125         *q = 0;
 126         break;
 127
 128     case 3:  /* UTF-8 */
 129         len = FFMIN(taglen, dstlen - 1);
 130         get_buffer(s->pb, dst, len);
 131         dst[len] = 0;
 132         break;
 133     default:
 134         av_log(s, AV_LOG_WARNING, "Unknown encoding in tag %s\n.", key);
 135     }
 136
 137     if (!strcmp(key, "genre")
 138         && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
 139         && genre <= ID3v1_GENRE_MAX)
 140         av_strlcpy(dst, ff_id3v1_genre_str[genre], sizeof(dst));
 141
 142     if (*dst)
 143         av_metadata_set(&s->metadata, key, dst);
 144 }
 145
 146 void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
 147 {
 148     int isv34, tlen;
 149     uint32_t tag;
 150     int64_t next;
 151     int taghdrlen;
 152     const char *reason;
 153
 154     switch (version) {
 155     case 2:
 156         if (flags & 0x40) {
 157             reason = "compression";
 158             goto error;
 159         }
 160         isv34 = 0;
 161         taghdrlen = 6;
 162         break;
 163
 164     case 3:
 165     case 4:
 166         isv34 = 1;
 167         taghdrlen = 10;
 168         break;
 169
 170     default:
 171         reason = "version";
 172         goto error;
 173     }
 174
 175     if (flags & 0x80) {
 176         reason = "unsynchronization";
 177         goto error;
 178     }
 179
 180     if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
 181         url_fskip(s->pb, get_size(s->pb, 4));
 182
 183     while (len >= taghdrlen) {
 184         if (isv34) {
 185             tag  = get_be32(s->pb);
 186             if(version==3){
 187                 tlen = get_be32(s->pb);
 188             }else
 189                 tlen = get_size(s->pb, 4);
 190             get_be16(s->pb); /* flags */
 191         } else {
 192             tag  = get_be24(s->pb);
 193             tlen = get_be24(s->pb);
 194         }
 195         len -= taghdrlen + tlen;
 196
 197         if (len < 0)
 198             break;
 199
 200         next = url_ftell(s->pb) + tlen;
 201
 202         switch (tag) {
 203         case MKBETAG('T', 'I', 'T', '2'):
 204         case MKBETAG(0,   'T', 'T', '2'):
 205             read_ttag(s, tlen, "title");
 206             break;
 207         case MKBETAG('T', 'P', 'E', '1'):
 208         case MKBETAG(0,   'T', 'P', '1'):
 209             read_ttag(s, tlen, "author");
 210             break;
 211         case MKBETAG('T', 'A', 'L', 'B'):
 212         case MKBETAG(0,   'T', 'A', 'L'):
 213             read_ttag(s, tlen, "album");
 214             break;
 215         case MKBETAG('T', 'C', 'O', 'N'):
 216         case MKBETAG(0,   'T', 'C', 'O'):
 217             read_ttag(s, tlen, "genre");
 218             break;
 219         case MKBETAG('T', 'C', 'O', 'P'):
 220         case MKBETAG(0,   'T', 'C', 'R'):
 221             read_ttag(s, tlen, "copyright");
 222             break;
 223         case MKBETAG('T', 'R', 'C', 'K'):
 224         case MKBETAG(0,   'T', 'R', 'K'):
 225             read_ttag(s, tlen, "track");
 226             break;
 227         case 0:
 228             /* padding, skip to end */
 229             url_fskip(s->pb, len);
 230             len = 0;
 231             continue;
 232         }
 233         /* Skip to end of tag */
 234         url_fseek(s->pb, next, SEEK_SET);
 235     }
 236
 237     if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
 238         url_fskip(s->pb, 10);
 239     return;
 240
 241   error:
 242     av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
 243     url_fskip(s->pb, len);
 244 }
 245
 246 const AVMetadataConv ff_id3v2_metadata_conv[] = {
 247     { "TALB", "album"},
 248     { "TCOM", "composer"},
 249     { "TCON", "genre"},
 250     { "TCOP", "copyright"},
 251     { "TDRL", "date"},
 252     { "TENC", "encoder"},
 253     { "TIT2", "title"},
 254     { "TLAN", "language"},
 255     { "TPE1", "author"},
 256     { "TPOS", "disc"},
 257     { "TPUB", "publisher"},
 258     { "TRCK", "track"},
 259     { "TSOA", "albumsort"},
 260     { "TSOP", "authorsort"},
 261     { "TSOT", "titlesort"},
 262     { 0 }
 263 };