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ffmpeg / libavformat / mp3.c @ 1bef65f4

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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

    
28
#define ID3v2_HEADER_SIZE 10
29
#define ID3v1_TAG_SIZE 128
30

    
31
#define ID3v1_GENRE_MAX 125
32

    
33
static 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

    
162
/* buf must be ID3v2_HEADER_SIZE byte long */
163
static int id3v2_match(const uint8_t *buf)
164
{
165
    return  buf[0] == 'I' &&
166
            buf[1] == 'D' &&
167
            buf[2] == '3' &&
168
            buf[3] != 0xff &&
169
            buf[4] != 0xff &&
170
            (buf[6] & 0x80) == 0 &&
171
            (buf[7] & 0x80) == 0 &&
172
            (buf[8] & 0x80) == 0 &&
173
            (buf[9] & 0x80) == 0;
174
}
175

    
176
static unsigned int id3v2_get_size(ByteIOContext *s, int len)
177
{
178
    int v=0;
179
    while(len--)
180
        v= (v<<7) + (get_byte(s)&0x7F);
181
    return v;
182
}
183

    
184
static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
185
{
186
    char *q;
187
    int len;
188

    
189
    if(dstlen > 0)
190
        dst[0]= 0;
191
    if(taglen < 1)
192
        return;
193

    
194
    taglen--; /* account for encoding type byte */
195
    dstlen--; /* Leave space for zero terminator */
196

    
197
    switch(get_byte(s->pb)) { /* encoding type */
198

    
199
    case 0:  /* ISO-8859-1 (0 - 255 maps directly into unicode) */
200
        q = dst;
201
        while(taglen--) {
202
            uint8_t tmp;
203
            PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
204
        }
205
        *q = '\0';
206
        break;
207

    
208
    case 3:  /* UTF-8 */
209
        len = FFMIN(taglen, dstlen-1);
210
        get_buffer(s->pb, dst, len);
211
        dst[len] = 0;
212
        break;
213
    }
214
}
215

    
216
/**
217
 * ID3v2 parser
218
 *
219
 * Handles ID3v2.2, 2.3 and 2.4.
220
 *
221
 */
222

    
223
static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
224
{
225
    int isv34, tlen;
226
    uint32_t tag;
227
    offset_t next;
228
    char tmp[16];
229
    int taghdrlen;
230
    const char *reason;
231

    
232
    switch(version) {
233
    case 2:
234
        if(flags & 0x40) {
235
            reason = "compression";
236
            goto error;
237
        }
238
        isv34 = 0;
239
        taghdrlen = 6;
240
        break;
241

    
242
    case 3:
243
    case 4:
244
        isv34 = 1;
245
        taghdrlen = 10;
246
        break;
247

    
248
    default:
249
        reason = "version";
250
        goto error;
251
    }
252

    
253
    if(flags & 0x80) {
254
        reason = "unsynchronization";
255
        goto error;
256
    }
257

    
258
    if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
259
        url_fskip(s->pb, id3v2_get_size(s->pb, 4));
260

    
261
    while(len >= taghdrlen) {
262
        if(isv34) {
263
            tag  = get_be32(s->pb);
264
            tlen = id3v2_get_size(s->pb, 4);
265
            get_be16(s->pb); /* flags */
266
        } else {
267
            tag  = get_be24(s->pb);
268
            tlen = id3v2_get_size(s->pb, 3);
269
        }
270
        len -= taghdrlen + tlen;
271

    
272
        if(len < 0)
273
            break;
274

    
275
        next = url_ftell(s->pb) + tlen;
276

    
277
        switch(tag) {
278
        case MKBETAG('T', 'I', 'T', '2'):
279
        case MKBETAG(0,   'T', 'T', '2'):
280
            id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
281
            break;
282
        case MKBETAG('T', 'P', 'E', '1'):
283
        case MKBETAG(0,   'T', 'P', '1'):
284
            id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
285
            break;
286
        case MKBETAG('T', 'A', 'L', 'B'):
287
        case MKBETAG(0,   'T', 'A', 'L'):
288
            id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
289
            break;
290
        case MKBETAG('T', 'C', 'O', 'N'):
291
        case MKBETAG(0,   'T', 'C', 'O'):
292
            id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
293
            break;
294
        case MKBETAG('T', 'C', 'O', 'P'):
295
        case MKBETAG(0,   'T', 'C', 'R'):
296
            id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
297
            break;
298
        case MKBETAG('T', 'R', 'C', 'K'):
299
        case MKBETAG(0,   'T', 'R', 'K'):
300
            id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
301
            s->track = atoi(tmp);
302
            break;
303
        case 0:
304
            /* padding, skip to end */
305
            url_fskip(s->pb, len);
306
            len = 0;
307
            continue;
308
        }
309
        /* Skip to end of tag */
310
        url_fseek(s->pb, next, SEEK_SET);
311
    }
312

    
313
    if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
314
        url_fskip(s->pb, 10);
315
    return;
316

    
317
  error:
318
    av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
319
    url_fskip(s->pb, len);
320
}
321

    
322
static void id3v1_get_string(char *str, int str_size,
323
                             const uint8_t *buf, int buf_size)
324
{
325
    int i, c;
326
    char *q;
327

    
328
    q = str;
329
    for(i = 0; i < buf_size; i++) {
330
        c = buf[i];
331
        if (c == '\0')
332
            break;
333
        if ((q - str) >= str_size - 1)
334
            break;
335
        *q++ = c;
336
    }
337
    *q = '\0';
338
}
339

    
340
/* 'buf' must be ID3v1_TAG_SIZE byte long */
341
static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
342
{
343
    char str[5];
344
    int genre;
345

    
346
    if (!(buf[0] == 'T' &&
347
          buf[1] == 'A' &&
348
          buf[2] == 'G'))
349
        return -1;
350
    id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
351
    id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
352
    id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
353
    id3v1_get_string(str, sizeof(str), buf + 93, 4);
354
    s->year = atoi(str);
355
    id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
356
    if (buf[125] == 0 && buf[126] != 0)
357
        s->track = buf[126];
358
    genre = buf[127];
359
    if (genre <= ID3v1_GENRE_MAX)
360
        av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
361
    return 0;
362
}
363

    
364
/* mp3 read */
365

    
366
static int mp3_read_probe(AVProbeData *p)
367
{
368
    int max_frames, first_frames = 0;
369
    int fsize, frames, sample_rate;
370
    uint32_t header;
371
    uint8_t *buf, *buf2, *end;
372
    AVCodecContext avctx;
373

    
374
    if(id3v2_match(p->buf))
375
        return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
376

    
377
    max_frames = 0;
378
    buf = p->buf;
379
    end = buf + p->buf_size - sizeof(uint32_t);
380

    
381
    for(; buf < end; buf= buf2+1) {
382
        buf2 = buf;
383

    
384
        for(frames = 0; buf2 < end; frames++) {
385
            header = AV_RB32(buf2);
386
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
387
            if(fsize < 0)
388
                break;
389
            buf2 += fsize;
390
        }
391
        max_frames = FFMAX(max_frames, frames);
392
        if(buf == p->buf)
393
            first_frames= frames;
394
    }
395
    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
396
    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
397
    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
398
    else if(max_frames>=1) return 1;
399
    else                   return 0;
400
}
401

    
402
/**
403
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
404
 */
405
static void mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, offset_t base)
406
{
407
    uint32_t v, spf;
408
    int frames = -1; /* Total number of frames in file */
409
    const offset_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
410
    MPADecodeContext c;
411

    
412
    v = get_be32(s->pb);
413
    if(ff_mpa_check_header(v) < 0)
414
      return;
415

    
416
    ff_mpegaudio_decode_header(&c, v);
417
    if(c.layer != 3)
418
        return;
419

    
420
    /* Check for Xing / Info tag */
421
    url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
422
    v = get_be32(s->pb);
423
    if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
424
        v = get_be32(s->pb);
425
        if(v & 0x1)
426
            frames = get_be32(s->pb);
427
    }
428

    
429
    /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
430
    url_fseek(s->pb, base + 4 + 32, SEEK_SET);
431
    v = get_be32(s->pb);
432
    if(v == MKBETAG('V', 'B', 'R', 'I')) {
433
        /* Check tag version */
434
        if(get_be16(s->pb) == 1) {
435
            /* skip delay, quality and total bytes */
436
            url_fseek(s->pb, 8, SEEK_CUR);
437
            frames = get_be32(s->pb);
438
        }
439
    }
440

    
441
    if(frames < 0)
442
        return;
443

    
444
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
445
    st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
446
                                st->time_base);
447
}
448

    
449
static int mp3_read_header(AVFormatContext *s,
450
                           AVFormatParameters *ap)
451
{
452
    AVStream *st;
453
    uint8_t buf[ID3v1_TAG_SIZE];
454
    int len, ret, filesize;
455
    offset_t off;
456

    
457
    st = av_new_stream(s, 0);
458
    if (!st)
459
        return AVERROR(ENOMEM);
460

    
461
    st->codec->codec_type = CODEC_TYPE_AUDIO;
462
    st->codec->codec_id = CODEC_ID_MP3;
463
    st->need_parsing = AVSTREAM_PARSE_FULL;
464
    st->start_time = 0;
465

    
466
    /* try to get the TAG */
467
    if (!url_is_streamed(s->pb)) {
468
        /* XXX: change that */
469
        filesize = url_fsize(s->pb);
470
        if (filesize > 128) {
471
            url_fseek(s->pb, filesize - 128, SEEK_SET);
472
            ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
473
            if (ret == ID3v1_TAG_SIZE) {
474
                id3v1_parse_tag(s, buf);
475
            }
476
            url_fseek(s->pb, 0, SEEK_SET);
477
        }
478
    }
479

    
480
    /* if ID3v2 header found, skip it */
481
    ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
482
    if (ret != ID3v2_HEADER_SIZE)
483
        return -1;
484
    if (id3v2_match(buf)) {
485
        /* parse ID3v2 header */
486
        len = ((buf[6] & 0x7f) << 21) |
487
            ((buf[7] & 0x7f) << 14) |
488
            ((buf[8] & 0x7f) << 7) |
489
            (buf[9] & 0x7f);
490
        id3v2_parse(s, len, buf[3], buf[5]);
491
    } else {
492
        url_fseek(s->pb, 0, SEEK_SET);
493
    }
494

    
495
    off = url_ftell(s->pb);
496
    mp3_parse_vbr_tags(s, st, off);
497
    url_fseek(s->pb, off, SEEK_SET);
498

    
499
    /* the parameters will be extracted from the compressed bitstream */
500
    return 0;
501
}
502

    
503
#define MP3_PACKET_SIZE 1024
504

    
505
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
506
{
507
    int ret, size;
508
    //    AVStream *st = s->streams[0];
509

    
510
    size= MP3_PACKET_SIZE;
511

    
512
    ret= av_get_packet(s->pb, pkt, size);
513

    
514
    pkt->stream_index = 0;
515
    if (ret <= 0) {
516
        return AVERROR(EIO);
517
    }
518
    /* note: we need to modify the packet size here to handle the last
519
       packet */
520
    pkt->size = ret;
521
    return ret;
522
}
523

    
524
#ifdef CONFIG_MUXERS
525
static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
526
{
527
    int v, i;
528

    
529
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
530
    buf[0] = 'T';
531
    buf[1] = 'A';
532
    buf[2] = 'G';
533
    strncpy(buf + 3, s->title, 30);
534
    strncpy(buf + 33, s->author, 30);
535
    strncpy(buf + 63, s->album, 30);
536
    v = s->year;
537
    if (v > 0) {
538
        for(i = 0;i < 4; i++) {
539
            buf[96 - i] = '0' + (v % 10);
540
            v = v / 10;
541
        }
542
    }
543
    strncpy(buf + 97, s->comment, 30);
544
    if (s->track != 0) {
545
        buf[125] = 0;
546
        buf[126] = s->track;
547
    }
548
    for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
549
        if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
550
            buf[127] = i;
551
            break;
552
        }
553
    }
554
}
555

    
556
/* simple formats */
557

    
558
static void id3v2_put_size(AVFormatContext *s, int size)
559
{
560
    put_byte(s->pb, size >> 21 & 0x7f);
561
    put_byte(s->pb, size >> 14 & 0x7f);
562
    put_byte(s->pb, size >> 7  & 0x7f);
563
    put_byte(s->pb, size       & 0x7f);
564
}
565

    
566
static void id3v2_put_ttag(AVFormatContext *s, const char *string, uint32_t tag)
567
{
568
    int len = strlen(string);
569
    put_be32(s->pb, tag);
570
    id3v2_put_size(s, len + 1);
571
    put_be16(s->pb, 0);
572
    put_byte(s->pb, 3); /* UTF-8 */
573
    put_buffer(s->pb, string, len);
574
}
575

    
576

    
577
/**
578
 * Write an ID3v2.4 header at beginning of stream
579
 */
580

    
581
static int mp3_write_header(struct AVFormatContext *s)
582
{
583
    int totlen = 0;
584
    char tracktxt[10];
585
    char yeartxt[10];
586

    
587
    if(s->track)
588
        snprintf(tracktxt, sizeof(tracktxt), "%d", s->track);
589
    if(s->year)
590
        snprintf( yeartxt, sizeof(yeartxt) , "%d", s->year );
591

    
592
    if(s->title[0])     totlen += 11 + strlen(s->title);
593
    if(s->author[0])    totlen += 11 + strlen(s->author);
594
    if(s->album[0])     totlen += 11 + strlen(s->album);
595
    if(s->genre[0])     totlen += 11 + strlen(s->genre);
596
    if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
597
    if(s->track)        totlen += 11 + strlen(tracktxt);
598
    if(s->year)         totlen += 11 + strlen(yeartxt);
599
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
600
        totlen += strlen(LIBAVFORMAT_IDENT) + 11;
601

    
602
    if(totlen == 0)
603
        return 0;
604

    
605
    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
606
    put_byte(s->pb, 0);
607
    put_byte(s->pb, 0); /* flags */
608

    
609
    id3v2_put_size(s, totlen);
610

    
611
    if(s->title[0])     id3v2_put_ttag(s, s->title,     MKBETAG('T', 'I', 'T', '2'));
612
    if(s->author[0])    id3v2_put_ttag(s, s->author,    MKBETAG('T', 'P', 'E', '1'));
613
    if(s->album[0])     id3v2_put_ttag(s, s->album,     MKBETAG('T', 'A', 'L', 'B'));
614
    if(s->genre[0])     id3v2_put_ttag(s, s->genre,     MKBETAG('T', 'C', 'O', 'N'));
615
    if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
616
    if(s->track)        id3v2_put_ttag(s, tracktxt,     MKBETAG('T', 'R', 'C', 'K'));
617
    if(s->year)         id3v2_put_ttag(s, yeartxt,      MKBETAG('T', 'Y', 'E', 'R'));
618
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
619
        id3v2_put_ttag(s, LIBAVFORMAT_IDENT,            MKBETAG('T', 'E', 'N', 'C'));
620
    return 0;
621
}
622

    
623
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
624
{
625
    put_buffer(s->pb, pkt->data, pkt->size);
626
    put_flush_packet(s->pb);
627
    return 0;
628
}
629

    
630
static int mp3_write_trailer(struct AVFormatContext *s)
631
{
632
    uint8_t buf[ID3v1_TAG_SIZE];
633

    
634
    /* write the id3v1 tag */
635
    if (s->title[0] != '\0') {
636
        id3v1_create_tag(s, buf);
637
        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
638
        put_flush_packet(s->pb);
639
    }
640
    return 0;
641
}
642
#endif //CONFIG_MUXERS
643

    
644
#ifdef CONFIG_MP3_DEMUXER
645
AVInputFormat mp3_demuxer = {
646
    "mp3",
647
    NULL_IF_CONFIG_SMALL("MPEG audio"),
648
    0,
649
    mp3_read_probe,
650
    mp3_read_header,
651
    mp3_read_packet,
652
    .flags= AVFMT_GENERIC_INDEX,
653
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
654
};
655
#endif
656
#ifdef CONFIG_MP2_MUXER
657
AVOutputFormat mp2_muxer = {
658
    "mp2",
659
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
660
    "audio/x-mpeg",
661
#ifdef CONFIG_LIBMP3LAME
662
    "mp2,m2a",
663
#else
664
    "mp2,mp3,m2a",
665
#endif
666
    0,
667
    CODEC_ID_MP2,
668
    CODEC_ID_NONE,
669
    NULL,
670
    mp3_write_packet,
671
    mp3_write_trailer,
672
};
673
#endif
674
#ifdef CONFIG_MP3_MUXER
675
AVOutputFormat mp3_muxer = {
676
    "mp3",
677
    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
678
    "audio/x-mpeg",
679
    "mp3",
680
    0,
681
    CODEC_ID_MP3,
682
    CODEC_ID_NONE,
683
    mp3_write_header,
684
    mp3_write_packet,
685
    mp3_write_trailer,
686
};
687
#endif