1/* 2 * MP3 muxer and demuxer 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 <strings.h> 23#include "libavutil/avstring.h" 24#include "libavcodec/mpegaudio.h" 25#include "libavcodec/mpegaudiodecheader.h" 26#include "avformat.h" 27#include "id3v2.h" 28 29#define ID3v1_TAG_SIZE 128 30 31#define ID3v1_GENRE_MAX 125 32 33static const char * const id3v1_genre_str[ID3v1_GENRE_MAX + 1] = { 34 [0] = "Blues", 35 [1] = "Classic Rock", 36 [2] = "Country", 37 [3] = "Dance", 38 [4] = "Disco", 39 [5] = "Funk", 40 [6] = "Grunge", 41 [7] = "Hip-Hop", 42 [8] = "Jazz", 43 [9] = "Metal", 44 [10] = "New Age", 45 [11] = "Oldies", 46 [12] = "Other", 47 [13] = "Pop", 48 [14] = "R&B", 49 [15] = "Rap", 50 [16] = "Reggae", 51 [17] = "Rock", 52 [18] = "Techno", 53 [19] = "Industrial", 54 [20] = "Alternative", 55 [21] = "Ska", 56 [22] = "Death Metal", 57 [23] = "Pranks", 58 [24] = "Soundtrack", 59 [25] = "Euro-Techno", 60 [26] = "Ambient", 61 [27] = "Trip-Hop", 62 [28] = "Vocal", 63 [29] = "Jazz+Funk", 64 [30] = "Fusion", 65 [31] = "Trance", 66 [32] = "Classical", 67 [33] = "Instrumental", 68 [34] = "Acid", 69 [35] = "House", 70 [36] = "Game", 71 [37] = "Sound Clip", 72 [38] = "Gospel", 73 [39] = "Noise", 74 [40] = "AlternRock", 75 [41] = "Bass", 76 [42] = "Soul", 77 [43] = "Punk", 78 [44] = "Space", 79 [45] = "Meditative", 80 [46] = "Instrumental Pop", 81 [47] = "Instrumental Rock", 82 [48] = "Ethnic", 83 [49] = "Gothic", 84 [50] = "Darkwave", 85 [51] = "Techno-Industrial", 86 [52] = "Electronic", 87 [53] = "Pop-Folk", 88 [54] = "Eurodance", 89 [55] = "Dream", 90 [56] = "Southern Rock", 91 [57] = "Comedy", 92 [58] = "Cult", 93 [59] = "Gangsta", 94 [60] = "Top 40", 95 [61] = "Christian Rap", 96 [62] = "Pop/Funk", 97 [63] = "Jungle", 98 [64] = "Native American", 99 [65] = "Cabaret", 100 [66] = "New Wave", 101 [67] = "Psychadelic", 102 [68] = "Rave", 103 [69] = "Showtunes", 104 [70] = "Trailer", 105 [71] = "Lo-Fi", 106 [72] = "Tribal", 107 [73] = "Acid Punk", 108 [74] = "Acid Jazz", 109 [75] = "Polka", 110 [76] = "Retro", 111 [77] = "Musical", 112 [78] = "Rock & Roll", 113 [79] = "Hard Rock", 114 [80] = "Folk", 115 [81] = "Folk-Rock", 116 [82] = "National Folk", 117 [83] = "Swing", 118 [84] = "Fast Fusion", 119 [85] = "Bebob", 120 [86] = "Latin", 121 [87] = "Revival", 122 [88] = "Celtic", 123 [89] = "Bluegrass", 124 [90] = "Avantgarde", 125 [91] = "Gothic Rock", 126 [92] = "Progressive Rock", 127 [93] = "Psychedelic Rock", 128 [94] = "Symphonic Rock", 129 [95] = "Slow Rock", 130 [96] = "Big Band", 131 [97] = "Chorus", 132 [98] = "Easy Listening", 133 [99] = "Acoustic", 134 [100] = "Humour", 135 [101] = "Speech", 136 [102] = "Chanson", 137 [103] = "Opera", 138 [104] = "Chamber Music", 139 [105] = "Sonata", 140 [106] = "Symphony", 141 [107] = "Booty Bass", 142 [108] = "Primus", 143 [109] = "Porn Groove", 144 [110] = "Satire", 145 [111] = "Slow Jam", 146 [112] = "Club", 147 [113] = "Tango", 148 [114] = "Samba", 149 [115] = "Folklore", 150 [116] = "Ballad", 151 [117] = "Power Ballad", 152 [118] = "Rhythmic Soul", 153 [119] = "Freestyle", 154 [120] = "Duet", 155 [121] = "Punk Rock", 156 [122] = "Drum Solo", 157 [123] = "A capella", 158 [124] = "Euro-House", 159 [125] = "Dance Hall", 160}; 161 162static unsigned int id3v2_get_size(ByteIOContext *s, int len) 163{ 164 int v=0; 165 while(len--) 166 v= (v<<7) + (get_byte(s)&0x7F); 167 return v; 168} 169 170static void id3v2_read_ttag(AVFormatContext *s, int taglen, const char *key) 171{ 172 char *q, dst[512]; 173 int len, dstlen = sizeof(dst) - 1; 174 unsigned genre; 175 176 dst[0]= 0; 177 if(taglen < 1) 178 return; 179 180 taglen--; /* account for encoding type byte */ 181 182 switch(get_byte(s->pb)) { /* encoding type */ 183 184 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */ 185 q = dst; 186 while(taglen--) { 187 uint8_t tmp; 188 PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;) 189 } 190 *q = '\0'; 191 break; 192 193 case 3: /* UTF-8 */ 194 len = FFMIN(taglen, dstlen-1); 195 get_buffer(s->pb, dst, len); 196 dst[len] = 0; 197 break; 198 } 199 200 if (!strcmp(key, "genre") 201 && sscanf(dst, "(%d)", &genre) == 1 && genre <= ID3v1_GENRE_MAX) 202 av_strlcpy(dst, id3v1_genre_str[genre], sizeof(dst)); 203 204 if (*dst) 205 av_metadata_set(&s->metadata, key, dst); 206} 207 208/** 209 * ID3v2 parser 210 * 211 * Handles ID3v2.2, 2.3 and 2.4. 212 * 213 */ 214 215static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags) 216{ 217 int isv34, tlen; 218 uint32_t tag; 219 int64_t next; 220 int taghdrlen; 221 const char *reason; 222 223 switch(version) { 224 case 2: 225 if(flags & 0x40) { 226 reason = "compression"; 227 goto error; 228 } 229 isv34 = 0; 230 taghdrlen = 6; 231 break; 232 233 case 3: 234 case 4: 235 isv34 = 1; 236 taghdrlen = 10; 237 break; 238 239 default: 240 reason = "version"; 241 goto error; 242 } 243 244 if(flags & 0x80) { 245 reason = "unsynchronization"; 246 goto error; 247 } 248 249 if(isv34 && flags & 0x40) /* Extended header present, just skip over it */ 250 url_fskip(s->pb, id3v2_get_size(s->pb, 4)); 251 252 while(len >= taghdrlen) { 253 if(isv34) { 254 tag = get_be32(s->pb); 255 tlen = id3v2_get_size(s->pb, 4); 256 get_be16(s->pb); /* flags */ 257 } else { 258 tag = get_be24(s->pb); 259 tlen = id3v2_get_size(s->pb, 3); 260 } 261 len -= taghdrlen + tlen; 262 263 if(len < 0) 264 break; 265 266 next = url_ftell(s->pb) + tlen; 267 268 switch(tag) { 269 case MKBETAG('T', 'I', 'T', '2'): 270 case MKBETAG(0, 'T', 'T', '2'): 271 id3v2_read_ttag(s, tlen, "title"); 272 break; 273 case MKBETAG('T', 'P', 'E', '1'): 274 case MKBETAG(0, 'T', 'P', '1'): 275 id3v2_read_ttag(s, tlen, "author"); 276 break; 277 case MKBETAG('T', 'A', 'L', 'B'): 278 case MKBETAG(0, 'T', 'A', 'L'): 279 id3v2_read_ttag(s, tlen, "album"); 280 break; 281 case MKBETAG('T', 'C', 'O', 'N'): 282 case MKBETAG(0, 'T', 'C', 'O'): 283 id3v2_read_ttag(s, tlen, "genre"); 284 break; 285 case MKBETAG('T', 'C', 'O', 'P'): 286 case MKBETAG(0, 'T', 'C', 'R'): 287 id3v2_read_ttag(s, tlen, "copyright"); 288 break; 289 case MKBETAG('T', 'R', 'C', 'K'): 290 case MKBETAG(0, 'T', 'R', 'K'): 291 id3v2_read_ttag(s, tlen, "track"); 292 break; 293 case 0: 294 /* padding, skip to end */ 295 url_fskip(s->pb, len); 296 len = 0; 297 continue; 298 } 299 /* Skip to end of tag */ 300 url_fseek(s->pb, next, SEEK_SET); 301 } 302 303 if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */ 304 url_fskip(s->pb, 10); 305 return; 306 307 error: 308 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason); 309 url_fskip(s->pb, len); 310} 311 312static void id3v1_get_string(AVFormatContext *s, const char *key, 313 const uint8_t *buf, int buf_size) 314{ 315 int i, c; 316 char *q, str[512]; 317 318 q = str; 319 for(i = 0; i < buf_size; i++) { 320 c = buf[i]; 321 if (c == '\0') 322 break; 323 if ((q - str) >= sizeof(str) - 1) 324 break; 325 *q++ = c; 326 } 327 *q = '\0'; 328 329 if (*str) 330 av_metadata_set(&s->metadata, key, str); 331} 332 333/* 'buf' must be ID3v1_TAG_SIZE byte long */ 334static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf) 335{ 336 char str[5]; 337 int genre; 338 339 if (!(buf[0] == 'T' && 340 buf[1] == 'A' && 341 buf[2] == 'G')) 342 return -1; 343 id3v1_get_string(s, "title", buf + 3, 30); 344 id3v1_get_string(s, "author", buf + 33, 30); 345 id3v1_get_string(s, "album", buf + 63, 30); 346 id3v1_get_string(s, "year", buf + 93, 4); 347 id3v1_get_string(s, "comment", buf + 97, 30); 348 if (buf[125] == 0 && buf[126] != 0) { 349 snprintf(str, sizeof(str), "%d", buf[126]); 350 av_metadata_set(&s->metadata, "track", str); 351 } 352 genre = buf[127]; 353 if (genre <= ID3v1_GENRE_MAX) 354 av_metadata_set(&s->metadata, "genre", id3v1_genre_str[genre]); 355 return 0; 356} 357 358/* mp3 read */ 359 360static int mp3_read_probe(AVProbeData *p) 361{ 362 int max_frames, first_frames = 0; 363 int fsize, frames, sample_rate; 364 uint32_t header; 365 uint8_t *buf, *buf0, *buf2, *end; 366 AVCodecContext avctx; 367 368 buf0 = p->buf; 369 if(ff_id3v2_match(buf0)) { 370 buf0 += ff_id3v2_tag_len(buf0); 371 } 372 373 max_frames = 0; 374 buf = buf0; 375 end = p->buf + p->buf_size - sizeof(uint32_t); 376 377 for(; buf < end; buf= buf2+1) { 378 buf2 = buf; 379 380 for(frames = 0; buf2 < end; frames++) { 381 header = AV_RB32(buf2); 382 fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate); 383 if(fsize < 0) 384 break; 385 buf2 += fsize; 386 } 387 max_frames = FFMAX(max_frames, frames); 388 if(buf == buf0) 389 first_frames= frames; 390 } 391 if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1; 392 else if(max_frames>500)return AVPROBE_SCORE_MAX/2; 393 else if(max_frames>=3) return AVPROBE_SCORE_MAX/4; 394 else if(buf0!=p->buf) return AVPROBE_SCORE_MAX/4-1; 395 else if(max_frames>=1) return 1; 396 else return 0; 397} 398 399/** 400 * Try to find Xing/Info/VBRI tags and compute duration from info therein 401 */ 402static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) 403{ 404 uint32_t v, spf; 405 int frames = -1; /* Total number of frames in file */ 406 const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}}; 407 MPADecodeHeader c; 408 int vbrtag_size = 0; 409 410 v = get_be32(s->pb); 411 if(ff_mpa_check_header(v) < 0) 412 return -1; 413 414 if (ff_mpegaudio_decode_header(&c, v) == 0) 415 vbrtag_size = c.frame_size; 416 if(c.layer != 3) 417 return -1; 418 419 /* Check for Xing / Info tag */ 420 url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR); 421 v = get_be32(s->pb); 422 if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) { 423 v = get_be32(s->pb); 424 if(v & 0x1) 425 frames = get_be32(s->pb); 426 } 427 428 /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */ 429 url_fseek(s->pb, base + 4 + 32, SEEK_SET); 430 v = get_be32(s->pb); 431 if(v == MKBETAG('V', 'B', 'R', 'I')) { 432 /* Check tag version */ 433 if(get_be16(s->pb) == 1) { 434 /* skip delay, quality and total bytes */ 435 url_fseek(s->pb, 8, SEEK_CUR); 436 frames = get_be32(s->pb); 437 } 438 } 439 440 if(frames < 0) 441 return -1; 442 443 /* Skip the vbr tag frame */ 444 url_fseek(s->pb, base + vbrtag_size, SEEK_SET); 445 446 spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */ 447 st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate}, 448 st->time_base); 449 return 0; 450} 451 452static int mp3_read_header(AVFormatContext *s, 453 AVFormatParameters *ap) 454{ 455 AVStream *st; 456 uint8_t buf[ID3v1_TAG_SIZE]; 457 int len, ret, filesize; 458 int64_t off; 459 460 st = av_new_stream(s, 0); 461 if (!st) 462 return AVERROR(ENOMEM); 463 464 st->codec->codec_type = CODEC_TYPE_AUDIO; 465 st->codec->codec_id = CODEC_ID_MP3; 466 st->need_parsing = AVSTREAM_PARSE_FULL; 467 st->start_time = 0; 468 469 /* try to get the TAG */ 470 if (!url_is_streamed(s->pb)) { 471 /* XXX: change that */ 472 filesize = url_fsize(s->pb); 473 if (filesize > 128) { 474 url_fseek(s->pb, filesize - 128, SEEK_SET); 475 ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE); 476 if (ret == ID3v1_TAG_SIZE) { 477 id3v1_parse_tag(s, buf); 478 } 479 url_fseek(s->pb, 0, SEEK_SET); 480 } 481 } 482 483 /* if ID3v2 header found, skip it */ 484 ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE); 485 if (ret != ID3v2_HEADER_SIZE) 486 return -1; 487 if (ff_id3v2_match(buf)) { 488 /* parse ID3v2 header */ 489 len = ((buf[6] & 0x7f) << 21) | 490 ((buf[7] & 0x7f) << 14) | 491 ((buf[8] & 0x7f) << 7) | 492 (buf[9] & 0x7f); 493 id3v2_parse(s, len, buf[3], buf[5]); 494 } else { 495 url_fseek(s->pb, 0, SEEK_SET); 496 } 497 498 off = url_ftell(s->pb); 499 if (mp3_parse_vbr_tags(s, st, off) < 0) 500 url_fseek(s->pb, off, SEEK_SET); 501 502 /* the parameters will be extracted from the compressed bitstream */ 503 return 0; 504} 505 506#define MP3_PACKET_SIZE 1024 507 508static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt) 509{ 510 int ret, size; 511 // AVStream *st = s->streams[0]; 512 513 size= MP3_PACKET_SIZE; 514 515 ret= av_get_packet(s->pb, pkt, size); 516 517 pkt->stream_index = 0; 518 if (ret <= 0) { 519 return AVERROR(EIO); 520 } 521 /* note: we need to modify the packet size here to handle the last 522 packet */ 523 pkt->size = ret; 524 return ret; 525} 526 527#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER 528static int id3v1_set_string(AVFormatContext *s, const char *key, 529 uint8_t *buf, int buf_size) 530{ 531 AVMetadataTag *tag; 532 if ((tag = av_metadata_get(s->metadata, key, NULL, 0))) 533 strncpy(buf, tag->value, buf_size); 534 return !!tag; 535} 536 537static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf) 538{ 539 AVMetadataTag *tag; 540 int i, count = 0; 541 542 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */ 543 buf[0] = 'T'; 544 buf[1] = 'A'; 545 buf[2] = 'G'; 546 count += id3v1_set_string(s, "title", buf + 3, 30); 547 count += id3v1_set_string(s, "author", buf + 33, 30); 548 count += id3v1_set_string(s, "album", buf + 63, 30); 549 count += id3v1_set_string(s, "year", buf + 93, 4); 550 count += id3v1_set_string(s, "comment", buf + 97, 30); 551 if ((tag = av_metadata_get(s->metadata, "track", NULL, 0))) { 552 buf[125] = 0; 553 buf[126] = atoi(tag->value); 554 count++; 555 } 556 if ((tag = av_metadata_get(s->metadata, "genre", NULL, 0))) { 557 for(i = 0; i <= ID3v1_GENRE_MAX; i++) { 558 if (!strcasecmp(tag->value, id3v1_genre_str[i])) { 559 buf[127] = i; 560 count++; 561 break; 562 } 563 } 564 } 565 return count; 566} 567 568/* simple formats */ 569 570static void id3v2_put_size(AVFormatContext *s, int size) 571{ 572 put_byte(s->pb, size >> 21 & 0x7f); 573 put_byte(s->pb, size >> 14 & 0x7f); 574 put_byte(s->pb, size >> 7 & 0x7f); 575 put_byte(s->pb, size & 0x7f); 576} 577 578static void id3v2_put_ttag(AVFormatContext *s, const char *string, uint32_t tag) 579{ 580 int len = strlen(string); 581 put_be32(s->pb, tag); 582 id3v2_put_size(s, len + 1); 583 put_be16(s->pb, 0); 584 put_byte(s->pb, 3); /* UTF-8 */ 585 put_buffer(s->pb, string, len); 586} 587 588 589/** 590 * Write an ID3v2.4 header at beginning of stream 591 */ 592 593static int mp3_write_header(struct AVFormatContext *s) 594{ 595 AVMetadataTag *title, *author, *album, *genre, *copyright, *track, *year; 596 int totlen = 0; 597 598 title = av_metadata_get(s->metadata, "title", NULL, 0); 599 author = av_metadata_get(s->metadata, "author", NULL, 0); 600 album = av_metadata_get(s->metadata, "album", NULL, 0); 601 genre = av_metadata_get(s->metadata, "genre", NULL, 0); 602 copyright = av_metadata_get(s->metadata, "copyright", NULL, 0); 603 track = av_metadata_get(s->metadata, "track", NULL, 0); 604 year = av_metadata_get(s->metadata, "year", NULL, 0); 605 606 if(title) totlen += 11 + strlen(title->value); 607 if(author) totlen += 11 + strlen(author->value); 608 if(album) totlen += 11 + strlen(album->value); 609 if(genre) totlen += 11 + strlen(genre->value); 610 if(copyright) totlen += 11 + strlen(copyright->value); 611 if(track) totlen += 11 + strlen(track->value); 612 if(year) totlen += 11 + strlen(year->value); 613 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) 614 totlen += strlen(LIBAVFORMAT_IDENT) + 11; 615 616 if(totlen == 0) 617 return 0; 618 619 put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */ 620 put_byte(s->pb, 0); 621 put_byte(s->pb, 0); /* flags */ 622 623 id3v2_put_size(s, totlen); 624 625 if(title) id3v2_put_ttag(s, title->value, MKBETAG('T', 'I', 'T', '2')); 626 if(author) id3v2_put_ttag(s, author->value, MKBETAG('T', 'P', 'E', '1')); 627 if(album) id3v2_put_ttag(s, album->value, MKBETAG('T', 'A', 'L', 'B')); 628 if(genre) id3v2_put_ttag(s, genre->value, MKBETAG('T', 'C', 'O', 'N')); 629 if(copyright) id3v2_put_ttag(s, copyright->value, MKBETAG('T', 'C', 'O', 'P')); 630 if(track) id3v2_put_ttag(s, track->value, MKBETAG('T', 'R', 'C', 'K')); 631 if(year) id3v2_put_ttag(s, year->value, MKBETAG('T', 'Y', 'E', 'R')); 632 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) 633 id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C')); 634 return 0; 635} 636 637static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt) 638{ 639 put_buffer(s->pb, pkt->data, pkt->size); 640 put_flush_packet(s->pb); 641 return 0; 642} 643 644static int mp3_write_trailer(struct AVFormatContext *s) 645{ 646 uint8_t buf[ID3v1_TAG_SIZE]; 647 648 /* write the id3v1 tag */ 649 if (id3v1_create_tag(s, buf) > 0) { 650 put_buffer(s->pb, buf, ID3v1_TAG_SIZE); 651 put_flush_packet(s->pb); 652 } 653 return 0; 654} 655#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */ 656 657#if CONFIG_MP3_DEMUXER 658AVInputFormat mp3_demuxer = { 659 "mp3", 660 NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"), 661 0, 662 mp3_read_probe, 663 mp3_read_header, 664 mp3_read_packet, 665 .flags= AVFMT_GENERIC_INDEX, 666 .extensions = "mp2,mp3,m2a", /* XXX: use probe */ 667}; 668#endif 669#if CONFIG_MP2_MUXER 670AVOutputFormat mp2_muxer = { 671 "mp2", 672 NULL_IF_CONFIG_SMALL("MPEG audio layer 2"), 673 "audio/x-mpeg", 674 "mp2,m2a", 675 0, 676 CODEC_ID_MP2, 677 CODEC_ID_NONE, 678 NULL, 679 mp3_write_packet, 680 mp3_write_trailer, 681}; 682#endif 683#if CONFIG_MP3_MUXER 684AVOutputFormat mp3_muxer = { 685 "mp3", 686 NULL_IF_CONFIG_SMALL("MPEG audio layer 3"), 687 "audio/x-mpeg", 688 "mp3", 689 0, 690 CODEC_ID_MP3, 691 CODEC_ID_NONE, 692 mp3_write_header, 693 mp3_write_packet, 694 mp3_write_trailer, 695}; 696#endif 697