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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
#include "avformat.h"
22
#include "mpegaudio.h"
23
#include "avstring.h"
24
#include "mpegaudiodecheader.h"
25

    
26
#define ID3v2_HEADER_SIZE 10
27
#define ID3v1_TAG_SIZE 128
28

    
29
#define ID3v1_GENRE_MAX 125
30

    
31
static const char *id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
32
    [0] = "Blues",
33
    [1] = "Classic Rock",
34
    [2] = "Country",
35
    [3] = "Dance",
36
    [4] = "Disco",
37
    [5] = "Funk",
38
    [6] = "Grunge",
39
    [7] = "Hip-Hop",
40
    [8] = "Jazz",
41
    [9] = "Metal",
42
    [10] = "New Age",
43
    [11] = "Oldies",
44
    [12] = "Other",
45
    [13] = "Pop",
46
    [14] = "R&B",
47
    [15] = "Rap",
48
    [16] = "Reggae",
49
    [17] = "Rock",
50
    [18] = "Techno",
51
    [19] = "Industrial",
52
    [20] = "Alternative",
53
    [21] = "Ska",
54
    [22] = "Death Metal",
55
    [23] = "Pranks",
56
    [24] = "Soundtrack",
57
    [25] = "Euro-Techno",
58
    [26] = "Ambient",
59
    [27] = "Trip-Hop",
60
    [28] = "Vocal",
61
    [29] = "Jazz+Funk",
62
    [30] = "Fusion",
63
    [31] = "Trance",
64
    [32] = "Classical",
65
    [33] = "Instrumental",
66
    [34] = "Acid",
67
    [35] = "House",
68
    [36] = "Game",
69
    [37] = "Sound Clip",
70
    [38] = "Gospel",
71
    [39] = "Noise",
72
    [40] = "AlternRock",
73
    [41] = "Bass",
74
    [42] = "Soul",
75
    [43] = "Punk",
76
    [44] = "Space",
77
    [45] = "Meditative",
78
    [46] = "Instrumental Pop",
79
    [47] = "Instrumental Rock",
80
    [48] = "Ethnic",
81
    [49] = "Gothic",
82
    [50] = "Darkwave",
83
    [51] = "Techno-Industrial",
84
    [52] = "Electronic",
85
    [53] = "Pop-Folk",
86
    [54] = "Eurodance",
87
    [55] = "Dream",
88
    [56] = "Southern Rock",
89
    [57] = "Comedy",
90
    [58] = "Cult",
91
    [59] = "Gangsta",
92
    [60] = "Top 40",
93
    [61] = "Christian Rap",
94
    [62] = "Pop/Funk",
95
    [63] = "Jungle",
96
    [64] = "Native American",
97
    [65] = "Cabaret",
98
    [66] = "New Wave",
99
    [67] = "Psychadelic",
100
    [68] = "Rave",
101
    [69] = "Showtunes",
102
    [70] = "Trailer",
103
    [71] = "Lo-Fi",
104
    [72] = "Tribal",
105
    [73] = "Acid Punk",
106
    [74] = "Acid Jazz",
107
    [75] = "Polka",
108
    [76] = "Retro",
109
    [77] = "Musical",
110
    [78] = "Rock & Roll",
111
    [79] = "Hard Rock",
112
    [80] = "Folk",
113
    [81] = "Folk-Rock",
114
    [82] = "National Folk",
115
    [83] = "Swing",
116
    [84] = "Fast Fusion",
117
    [85] = "Bebob",
118
    [86] = "Latin",
119
    [87] = "Revival",
120
    [88] = "Celtic",
121
    [89] = "Bluegrass",
122
    [90] = "Avantgarde",
123
    [91] = "Gothic Rock",
124
    [92] = "Progressive Rock",
125
    [93] = "Psychedelic Rock",
126
    [94] = "Symphonic Rock",
127
    [95] = "Slow Rock",
128
    [96] = "Big Band",
129
    [97] = "Chorus",
130
    [98] = "Easy Listening",
131
    [99] = "Acoustic",
132
    [100] = "Humour",
133
    [101] = "Speech",
134
    [102] = "Chanson",
135
    [103] = "Opera",
136
    [104] = "Chamber Music",
137
    [105] = "Sonata",
138
    [106] = "Symphony",
139
    [107] = "Booty Bass",
140
    [108] = "Primus",
141
    [109] = "Porn Groove",
142
    [110] = "Satire",
143
    [111] = "Slow Jam",
144
    [112] = "Club",
145
    [113] = "Tango",
146
    [114] = "Samba",
147
    [115] = "Folklore",
148
    [116] = "Ballad",
149
    [117] = "Power Ballad",
150
    [118] = "Rhythmic Soul",
151
    [119] = "Freestyle",
152
    [120] = "Duet",
153
    [121] = "Punk Rock",
154
    [122] = "Drum Solo",
155
    [123] = "A capella",
156
    [124] = "Euro-House",
157
    [125] = "Dance Hall",
158
};
159

    
160
/* buf must be ID3v2_HEADER_SIZE byte long */
161
static int id3v2_match(const uint8_t *buf)
162
{
163
    return (buf[0] == 'I' &&
164
            buf[1] == 'D' &&
165
            buf[2] == '3' &&
166
            buf[3] != 0xff &&
167
            buf[4] != 0xff &&
168
            (buf[6] & 0x80) == 0 &&
169
            (buf[7] & 0x80) == 0 &&
170
            (buf[8] & 0x80) == 0 &&
171
            (buf[9] & 0x80) == 0);
172
}
173

    
174
static unsigned int id3v2_get_size(ByteIOContext *s, int len)
175
{
176
    int v=0;
177
    while(len--)
178
        v= (v<<7) + (get_byte(s)&0x7F);
179
    return v;
180
}
181

    
182
static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
183
{
184
    char *q;
185
    int len;
186

    
187
    if(taglen < 1)
188
        return;
189

    
190
    taglen--; /* account for encoding type byte */
191
    dstlen--; /* Leave space for zero terminator */
192

    
193
    switch(get_byte(&s->pb)) { /* encoding type */
194

    
195
    case 0:  /* ISO-8859-1 (0 - 255 maps directly into unicode) */
196
        q = dst;
197
        while(taglen--) {
198
            uint8_t tmp;
199
            PUT_UTF8(get_byte(&s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
200
        }
201
        *q = '\0';
202
        break;
203

    
204
    case 3:  /* UTF-8 */
205
        len = FFMIN(taglen, dstlen);
206
        get_buffer(&s->pb, dst, len);
207
        dst[len] = 0;
208
        break;
209
    }
210
}
211

    
212
/**
213
 * ID3v2 parser
214
 *
215
 * Handles ID3v2.2, 2.3 and 2.4.
216
 *
217
 */
218

    
219
static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
220
{
221
    int isv34, tlen;
222
    uint32_t tag;
223
    offset_t next;
224
    char tmp[16];
225
    int taghdrlen;
226
    const char *reason;
227

    
228
    switch(version) {
229
    case 2:
230
        if(flags & 0x40) {
231
            reason = "compression";
232
            goto error;
233
        }
234
        isv34 = 0;
235
        taghdrlen = 6;
236
        break;
237

    
238
    case 3:
239
    case 4:
240
        isv34 = 1;
241
        taghdrlen = 10;
242
        break;
243

    
244
    default:
245
        reason = "version";
246
        goto error;
247
    }
248

    
249
    if(flags & 0x80) {
250
        reason = "unsynchronization";
251
        goto error;
252
    }
253

    
254
    if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
255
        url_fskip(&s->pb, id3v2_get_size(&s->pb, 4));
256

    
257
    while(len >= taghdrlen) {
258
        if(isv34) {
259
            tag  = get_be32(&s->pb);
260
            tlen = id3v2_get_size(&s->pb, 4);
261
            get_be16(&s->pb); /* flags */
262
        } else {
263
            tag  = get_be24(&s->pb);
264
            tlen = id3v2_get_size(&s->pb, 3);
265
        }
266
        len -= taghdrlen + tlen;
267

    
268
        if(len < 0)
269
            break;
270

    
271
        next = url_ftell(&s->pb) + tlen;
272

    
273
        switch(tag) {
274
        case MKBETAG('T', 'I', 'T', '2'):
275
        case MKBETAG(0,   'T', 'T', '2'):
276
            id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
277
            break;
278
        case MKBETAG('T', 'P', 'E', '1'):
279
        case MKBETAG(0,   'T', 'P', '1'):
280
            id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
281
            break;
282
        case MKBETAG('T', 'A', 'L', 'B'):
283
        case MKBETAG(0,   'T', 'A', 'L'):
284
            id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
285
            break;
286
        case MKBETAG('T', 'C', 'O', 'N'):
287
        case MKBETAG(0,   'T', 'C', 'O'):
288
            id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
289
            break;
290
        case MKBETAG('T', 'C', 'O', 'P'):
291
        case MKBETAG(0,   'T', 'C', 'R'):
292
            id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
293
            break;
294
        case MKBETAG('T', 'R', 'C', 'K'):
295
        case MKBETAG(0,   'T', 'R', 'K'):
296
            id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
297
            s->track = atoi(tmp);
298
            break;
299
        case 0:
300
            /* padding, skip to end */
301
            url_fskip(&s->pb, len);
302
            len = 0;
303
            continue;
304
        }
305
        /* Skip to end of tag */
306
        url_fseek(&s->pb, next, SEEK_SET);
307
    }
308

    
309
    if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
310
        url_fskip(&s->pb, 10);
311
    return;
312

    
313
  error:
314
    av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
315
    url_fskip(&s->pb, len);
316
}
317

    
318
static void id3v1_get_string(char *str, int str_size,
319
                             const uint8_t *buf, int buf_size)
320
{
321
    int i, c;
322
    char *q;
323

    
324
    q = str;
325
    for(i = 0; i < buf_size; i++) {
326
        c = buf[i];
327
        if (c == '\0')
328
            break;
329
        if ((q - str) >= str_size - 1)
330
            break;
331
        *q++ = c;
332
    }
333
    *q = '\0';
334
}
335

    
336
/* 'buf' must be ID3v1_TAG_SIZE byte long */
337
static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
338
{
339
    char str[5];
340
    int genre;
341

    
342
    if (!(buf[0] == 'T' &&
343
          buf[1] == 'A' &&
344
          buf[2] == 'G'))
345
        return -1;
346
    id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
347
    id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
348
    id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
349
    id3v1_get_string(str, sizeof(str), buf + 93, 4);
350
    s->year = atoi(str);
351
    id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
352
    if (buf[125] == 0 && buf[126] != 0)
353
        s->track = buf[126];
354
    genre = buf[127];
355
    if (genre <= ID3v1_GENRE_MAX)
356
        av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
357
    return 0;
358
}
359

    
360
static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
361
{
362
    int v, i;
363

    
364
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
365
    buf[0] = 'T';
366
    buf[1] = 'A';
367
    buf[2] = 'G';
368
    strncpy(buf + 3, s->title, 30);
369
    strncpy(buf + 33, s->author, 30);
370
    strncpy(buf + 63, s->album, 30);
371
    v = s->year;
372
    if (v > 0) {
373
        for(i = 0;i < 4; i++) {
374
            buf[96 - i] = '0' + (v % 10);
375
            v = v / 10;
376
        }
377
    }
378
    strncpy(buf + 97, s->comment, 30);
379
    if (s->track != 0) {
380
        buf[125] = 0;
381
        buf[126] = s->track;
382
    }
383
    for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
384
        if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
385
            buf[127] = i;
386
            break;
387
        }
388
    }
389
}
390

    
391
/* mp3 read */
392

    
393
static int mp3_read_probe(AVProbeData *p)
394
{
395
    int max_frames, first_frames = 0;
396
    int fsize, frames, sample_rate;
397
    uint32_t header;
398
    uint8_t *buf, *buf2, *end;
399
    AVCodecContext avctx;
400

    
401
    if(id3v2_match(p->buf))
402
        return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
403

    
404
    max_frames = 0;
405
    buf = p->buf;
406
    end = buf + FFMIN(4096, p->buf_size - sizeof(uint32_t));
407

    
408
    for(; buf < end; buf++) {
409
        buf2 = buf;
410

    
411
        for(frames = 0; buf2 < end; frames++) {
412
            header = AV_RB32(buf2);
413
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
414
            if(fsize < 0)
415
                break;
416
            buf2 += fsize;
417
        }
418
        max_frames = FFMAX(max_frames, frames);
419
        if(buf == p->buf)
420
            first_frames= frames;
421
    }
422
    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
423
    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
424
    else if(max_frames>=1) return 1;
425
    else                   return 0;
426
}
427

    
428
/**
429
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
430
 */
431
static void mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, offset_t base)
432
{
433
    uint32_t v, spf;
434
    int frames = -1; /* Total number of frames in file */
435
    const offset_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
436
    MPADecodeContext c;
437

    
438
    ff_mpegaudio_decode_header(&c, get_be32(&s->pb));
439
    if(c.layer != 3)
440
        return;
441

    
442
    /* Check for Xing / Info tag */
443
    url_fseek(&s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
444
    v = get_be32(&s->pb);
445
    if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
446
        v = get_be32(&s->pb);
447
        if(v & 0x1)
448
            frames = get_be32(&s->pb);
449
    }
450

    
451
    /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
452
    url_fseek(&s->pb, base + 4 + 32, SEEK_SET);
453
    v = get_be32(&s->pb);
454
    if(v == MKBETAG('V', 'B', 'R', 'I')) {
455
        /* Check tag version */
456
        if(get_be16(&s->pb) == 1) {
457
            /* skip delay, quality and total bytes */
458
            url_fseek(&s->pb, 8, SEEK_CUR);
459
            frames = get_be32(&s->pb);
460
        }
461
    }
462

    
463
    if(frames < 0)
464
        return;
465

    
466
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
467
    st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
468
                                st->time_base);
469
}
470

    
471
static int mp3_read_header(AVFormatContext *s,
472
                           AVFormatParameters *ap)
473
{
474
    AVStream *st;
475
    uint8_t buf[ID3v1_TAG_SIZE];
476
    int len, ret, filesize;
477
    offset_t off;
478

    
479
    st = av_new_stream(s, 0);
480
    if (!st)
481
        return AVERROR(ENOMEM);
482

    
483
    st->codec->codec_type = CODEC_TYPE_AUDIO;
484
    st->codec->codec_id = CODEC_ID_MP3;
485
    st->need_parsing = AVSTREAM_PARSE_FULL;
486
    st->start_time = 0;
487

    
488
    /* try to get the TAG */
489
    if (!url_is_streamed(&s->pb)) {
490
        /* XXX: change that */
491
        filesize = url_fsize(&s->pb);
492
        if (filesize > 128) {
493
            url_fseek(&s->pb, filesize - 128, SEEK_SET);
494
            ret = get_buffer(&s->pb, buf, ID3v1_TAG_SIZE);
495
            if (ret == ID3v1_TAG_SIZE) {
496
                id3v1_parse_tag(s, buf);
497
            }
498
            url_fseek(&s->pb, 0, SEEK_SET);
499
        }
500
    }
501

    
502
    /* if ID3v2 header found, skip it */
503
    ret = get_buffer(&s->pb, buf, ID3v2_HEADER_SIZE);
504
    if (ret != ID3v2_HEADER_SIZE)
505
        return -1;
506
    if (id3v2_match(buf)) {
507
        /* parse ID3v2 header */
508
        len = ((buf[6] & 0x7f) << 21) |
509
            ((buf[7] & 0x7f) << 14) |
510
            ((buf[8] & 0x7f) << 7) |
511
            (buf[9] & 0x7f);
512
        id3v2_parse(s, len, buf[3], buf[5]);
513
    } else {
514
        url_fseek(&s->pb, 0, SEEK_SET);
515
    }
516

    
517
    off = url_ftell(&s->pb);
518
    mp3_parse_vbr_tags(s, st, off);
519
    url_fseek(&s->pb, off, SEEK_SET);
520

    
521
    /* the parameters will be extracted from the compressed bitstream */
522
    return 0;
523
}
524

    
525
#define MP3_PACKET_SIZE 1024
526

    
527
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
528
{
529
    int ret, size;
530
    //    AVStream *st = s->streams[0];
531

    
532
    size= MP3_PACKET_SIZE;
533

    
534
    ret= av_get_packet(&s->pb, pkt, size);
535

    
536
    pkt->stream_index = 0;
537
    if (ret <= 0) {
538
        return AVERROR(EIO);
539
    }
540
    /* note: we need to modify the packet size here to handle the last
541
       packet */
542
    pkt->size = ret;
543
    return ret;
544
}
545

    
546
static int mp3_read_close(AVFormatContext *s)
547
{
548
    return 0;
549
}
550

    
551
#ifdef CONFIG_MUXERS
552
/* simple formats */
553

    
554
static void id3v2_put_size(AVFormatContext *s, int size)
555
{
556
    put_byte(&s->pb, size >> 21 & 0x7f);
557
    put_byte(&s->pb, size >> 14 & 0x7f);
558
    put_byte(&s->pb, size >> 7  & 0x7f);
559
    put_byte(&s->pb, size       & 0x7f);
560
}
561

    
562
static void id3v2_put_ttag(AVFormatContext *s, char *string, uint32_t tag)
563
{
564
    int len = strlen(string);
565
    put_be32(&s->pb, tag);
566
    id3v2_put_size(s, len + 1);
567
    put_be16(&s->pb, 0);
568
    put_byte(&s->pb, 3); /* UTF-8 */
569
    put_buffer(&s->pb, string, len);
570
}
571

    
572

    
573
/**
574
 * Write an ID3v2.4 header at beginning of stream
575
 */
576

    
577
static int mp3_write_header(struct AVFormatContext *s)
578
{
579
    int totlen = 0;
580
    char tracktxt[10];
581

    
582
    if(s->track)
583
        snprintf(tracktxt, sizeof(tracktxt) - 1, "%d", s->track);
584

    
585
    if(s->title[0])     totlen += 11 + strlen(s->title);
586
    if(s->author[0])    totlen += 11 + strlen(s->author);
587
    if(s->album[0])     totlen += 11 + strlen(s->album);
588
    if(s->genre[0])     totlen += 11 + strlen(s->genre);
589
    if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
590
    if(s->track)        totlen += 11 + strlen(tracktxt);
591
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
592
        totlen += strlen(LIBAVFORMAT_IDENT) + 11;
593

    
594
    if(totlen == 0)
595
        return 0;
596

    
597
    put_be32(&s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
598
    put_byte(&s->pb, 0);
599
    put_byte(&s->pb, 0); /* flags */
600

    
601
    id3v2_put_size(s, totlen);
602

    
603
    if(s->title[0])     id3v2_put_ttag(s, s->title,     MKBETAG('T', 'I', 'T', '2'));
604
    if(s->author[0])    id3v2_put_ttag(s, s->author,    MKBETAG('T', 'P', 'E', '1'));
605
    if(s->album[0])     id3v2_put_ttag(s, s->album,     MKBETAG('T', 'A', 'L', 'B'));
606
    if(s->genre[0])     id3v2_put_ttag(s, s->genre,     MKBETAG('T', 'C', 'O', 'N'));
607
    if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
608
    if(s->track)        id3v2_put_ttag(s, tracktxt,     MKBETAG('T', 'R', 'C', 'K'));
609
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
610
        id3v2_put_ttag(s, LIBAVFORMAT_IDENT,            MKBETAG('T', 'E', 'N', 'C'));
611
    return 0;
612
}
613

    
614
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
615
{
616
    put_buffer(&s->pb, pkt->data, pkt->size);
617
    put_flush_packet(&s->pb);
618
    return 0;
619
}
620

    
621
static int mp3_write_trailer(struct AVFormatContext *s)
622
{
623
    uint8_t buf[ID3v1_TAG_SIZE];
624

    
625
    /* write the id3v1 tag */
626
    if (s->title[0] != '\0') {
627
        id3v1_create_tag(s, buf);
628
        put_buffer(&s->pb, buf, ID3v1_TAG_SIZE);
629
        put_flush_packet(&s->pb);
630
    }
631
    return 0;
632
}
633
#endif //CONFIG_MUXERS
634

    
635
#ifdef CONFIG_MP3_DEMUXER
636
AVInputFormat mp3_demuxer = {
637
    "mp3",
638
    "MPEG audio",
639
    0,
640
    mp3_read_probe,
641
    mp3_read_header,
642
    mp3_read_packet,
643
    mp3_read_close,
644
    .flags= AVFMT_GENERIC_INDEX,
645
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
646
};
647
#endif
648
#ifdef CONFIG_MP2_MUXER
649
AVOutputFormat mp2_muxer = {
650
    "mp2",
651
    "MPEG audio layer 2",
652
    "audio/x-mpeg",
653
#ifdef CONFIG_LIBMP3LAME
654
    "mp2,m2a",
655
#else
656
    "mp2,mp3,m2a",
657
#endif
658
    0,
659
    CODEC_ID_MP2,
660
    0,
661
    NULL,
662
    mp3_write_packet,
663
    mp3_write_trailer,
664
};
665
#endif
666
#ifdef CONFIG_MP3_MUXER
667
AVOutputFormat mp3_muxer = {
668
    "mp3",
669
    "MPEG audio layer 3",
670
    "audio/x-mpeg",
671
    "mp3",
672
    0,
673
    CODEC_ID_MP3,
674
    0,
675
    mp3_write_header,
676
    mp3_write_packet,
677
    mp3_write_trailer,
678
};
679
#endif