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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 "libavutil/avstring.h"
23
#include "libavcodec/mpegaudio.h"
24
#include "libavcodec/mpegaudiodecheader.h"
25
#include "avformat.h"
26

    
27
#define ID3v2_HEADER_SIZE 10
28
#define ID3v1_TAG_SIZE 128
29

    
30
#define ID3v1_GENRE_MAX 125
31

    
32
static const char *id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
33
    [0] = "Blues",
34
    [1] = "Classic Rock",
35
    [2] = "Country",
36
    [3] = "Dance",
37
    [4] = "Disco",
38
    [5] = "Funk",
39
    [6] = "Grunge",
40
    [7] = "Hip-Hop",
41
    [8] = "Jazz",
42
    [9] = "Metal",
43
    [10] = "New Age",
44
    [11] = "Oldies",
45
    [12] = "Other",
46
    [13] = "Pop",
47
    [14] = "R&B",
48
    [15] = "Rap",
49
    [16] = "Reggae",
50
    [17] = "Rock",
51
    [18] = "Techno",
52
    [19] = "Industrial",
53
    [20] = "Alternative",
54
    [21] = "Ska",
55
    [22] = "Death Metal",
56
    [23] = "Pranks",
57
    [24] = "Soundtrack",
58
    [25] = "Euro-Techno",
59
    [26] = "Ambient",
60
    [27] = "Trip-Hop",
61
    [28] = "Vocal",
62
    [29] = "Jazz+Funk",
63
    [30] = "Fusion",
64
    [31] = "Trance",
65
    [32] = "Classical",
66
    [33] = "Instrumental",
67
    [34] = "Acid",
68
    [35] = "House",
69
    [36] = "Game",
70
    [37] = "Sound Clip",
71
    [38] = "Gospel",
72
    [39] = "Noise",
73
    [40] = "AlternRock",
74
    [41] = "Bass",
75
    [42] = "Soul",
76
    [43] = "Punk",
77
    [44] = "Space",
78
    [45] = "Meditative",
79
    [46] = "Instrumental Pop",
80
    [47] = "Instrumental Rock",
81
    [48] = "Ethnic",
82
    [49] = "Gothic",
83
    [50] = "Darkwave",
84
    [51] = "Techno-Industrial",
85
    [52] = "Electronic",
86
    [53] = "Pop-Folk",
87
    [54] = "Eurodance",
88
    [55] = "Dream",
89
    [56] = "Southern Rock",
90
    [57] = "Comedy",
91
    [58] = "Cult",
92
    [59] = "Gangsta",
93
    [60] = "Top 40",
94
    [61] = "Christian Rap",
95
    [62] = "Pop/Funk",
96
    [63] = "Jungle",
97
    [64] = "Native American",
98
    [65] = "Cabaret",
99
    [66] = "New Wave",
100
    [67] = "Psychadelic",
101
    [68] = "Rave",
102
    [69] = "Showtunes",
103
    [70] = "Trailer",
104
    [71] = "Lo-Fi",
105
    [72] = "Tribal",
106
    [73] = "Acid Punk",
107
    [74] = "Acid Jazz",
108
    [75] = "Polka",
109
    [76] = "Retro",
110
    [77] = "Musical",
111
    [78] = "Rock & Roll",
112
    [79] = "Hard Rock",
113
    [80] = "Folk",
114
    [81] = "Folk-Rock",
115
    [82] = "National Folk",
116
    [83] = "Swing",
117
    [84] = "Fast Fusion",
118
    [85] = "Bebob",
119
    [86] = "Latin",
120
    [87] = "Revival",
121
    [88] = "Celtic",
122
    [89] = "Bluegrass",
123
    [90] = "Avantgarde",
124
    [91] = "Gothic Rock",
125
    [92] = "Progressive Rock",
126
    [93] = "Psychedelic Rock",
127
    [94] = "Symphonic Rock",
128
    [95] = "Slow Rock",
129
    [96] = "Big Band",
130
    [97] = "Chorus",
131
    [98] = "Easy Listening",
132
    [99] = "Acoustic",
133
    [100] = "Humour",
134
    [101] = "Speech",
135
    [102] = "Chanson",
136
    [103] = "Opera",
137
    [104] = "Chamber Music",
138
    [105] = "Sonata",
139
    [106] = "Symphony",
140
    [107] = "Booty Bass",
141
    [108] = "Primus",
142
    [109] = "Porn Groove",
143
    [110] = "Satire",
144
    [111] = "Slow Jam",
145
    [112] = "Club",
146
    [113] = "Tango",
147
    [114] = "Samba",
148
    [115] = "Folklore",
149
    [116] = "Ballad",
150
    [117] = "Power Ballad",
151
    [118] = "Rhythmic Soul",
152
    [119] = "Freestyle",
153
    [120] = "Duet",
154
    [121] = "Punk Rock",
155
    [122] = "Drum Solo",
156
    [123] = "A capella",
157
    [124] = "Euro-House",
158
    [125] = "Dance Hall",
159
};
160

    
161
/* buf must be ID3v2_HEADER_SIZE byte long */
162
static int id3v2_match(const uint8_t *buf)
163
{
164
    return  buf[0] == 'I' &&
165
            buf[1] == 'D' &&
166
            buf[2] == '3' &&
167
            buf[3] != 0xff &&
168
            buf[4] != 0xff &&
169
            (buf[6] & 0x80) == 0 &&
170
            (buf[7] & 0x80) == 0 &&
171
            (buf[8] & 0x80) == 0 &&
172
            (buf[9] & 0x80) == 0;
173
}
174

    
175
static unsigned int id3v2_get_size(ByteIOContext *s, int len)
176
{
177
    int v=0;
178
    while(len--)
179
        v= (v<<7) + (get_byte(s)&0x7F);
180
    return v;
181
}
182

    
183
static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
184
{
185
    char *q;
186
    int len;
187

    
188
    if(dstlen > 0)
189
        dst[0]= 0;
190
    if(taglen < 1)
191
        return;
192

    
193
    taglen--; /* account for encoding type byte */
194
    dstlen--; /* Leave space for zero terminator */
195

    
196
    switch(get_byte(s->pb)) { /* encoding type */
197

    
198
    case 0:  /* ISO-8859-1 (0 - 255 maps directly into unicode) */
199
        q = dst;
200
        while(taglen--) {
201
            uint8_t tmp;
202
            PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
203
        }
204
        *q = '\0';
205
        break;
206

    
207
    case 3:  /* UTF-8 */
208
        len = FFMIN(taglen, dstlen-1);
209
        get_buffer(s->pb, dst, len);
210
        dst[len] = 0;
211
        break;
212
    }
213
}
214

    
215
/**
216
 * ID3v2 parser
217
 *
218
 * Handles ID3v2.2, 2.3 and 2.4.
219
 *
220
 */
221

    
222
static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
223
{
224
    int isv34, tlen;
225
    uint32_t tag;
226
    offset_t next;
227
    char tmp[16];
228
    int taghdrlen;
229
    const char *reason;
230

    
231
    switch(version) {
232
    case 2:
233
        if(flags & 0x40) {
234
            reason = "compression";
235
            goto error;
236
        }
237
        isv34 = 0;
238
        taghdrlen = 6;
239
        break;
240

    
241
    case 3:
242
    case 4:
243
        isv34 = 1;
244
        taghdrlen = 10;
245
        break;
246

    
247
    default:
248
        reason = "version";
249
        goto error;
250
    }
251

    
252
    if(flags & 0x80) {
253
        reason = "unsynchronization";
254
        goto error;
255
    }
256

    
257
    if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
258
        url_fskip(s->pb, id3v2_get_size(s->pb, 4));
259

    
260
    while(len >= taghdrlen) {
261
        if(isv34) {
262
            tag  = get_be32(s->pb);
263
            tlen = id3v2_get_size(s->pb, 4);
264
            get_be16(s->pb); /* flags */
265
        } else {
266
            tag  = get_be24(s->pb);
267
            tlen = id3v2_get_size(s->pb, 3);
268
        }
269
        len -= taghdrlen + tlen;
270

    
271
        if(len < 0)
272
            break;
273

    
274
        next = url_ftell(s->pb) + tlen;
275

    
276
        switch(tag) {
277
        case MKBETAG('T', 'I', 'T', '2'):
278
        case MKBETAG(0,   'T', 'T', '2'):
279
            id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
280
            break;
281
        case MKBETAG('T', 'P', 'E', '1'):
282
        case MKBETAG(0,   'T', 'P', '1'):
283
            id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
284
            break;
285
        case MKBETAG('T', 'A', 'L', 'B'):
286
        case MKBETAG(0,   'T', 'A', 'L'):
287
            id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
288
            break;
289
        case MKBETAG('T', 'C', 'O', 'N'):
290
        case MKBETAG(0,   'T', 'C', 'O'):
291
            id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
292
            break;
293
        case MKBETAG('T', 'C', 'O', 'P'):
294
        case MKBETAG(0,   'T', 'C', 'R'):
295
            id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
296
            break;
297
        case MKBETAG('T', 'R', 'C', 'K'):
298
        case MKBETAG(0,   'T', 'R', 'K'):
299
            id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
300
            s->track = atoi(tmp);
301
            break;
302
        case 0:
303
            /* padding, skip to end */
304
            url_fskip(s->pb, len);
305
            len = 0;
306
            continue;
307
        }
308
        /* Skip to end of tag */
309
        url_fseek(s->pb, next, SEEK_SET);
310
    }
311

    
312
    if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
313
        url_fskip(s->pb, 10);
314
    return;
315

    
316
  error:
317
    av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
318
    url_fskip(s->pb, len);
319
}
320

    
321
static void id3v1_get_string(char *str, int str_size,
322
                             const uint8_t *buf, int buf_size)
323
{
324
    int i, c;
325
    char *q;
326

    
327
    q = str;
328
    for(i = 0; i < buf_size; i++) {
329
        c = buf[i];
330
        if (c == '\0')
331
            break;
332
        if ((q - str) >= str_size - 1)
333
            break;
334
        *q++ = c;
335
    }
336
    *q = '\0';
337
}
338

    
339
/* 'buf' must be ID3v1_TAG_SIZE byte long */
340
static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
341
{
342
    char str[5];
343
    int genre;
344

    
345
    if (!(buf[0] == 'T' &&
346
          buf[1] == 'A' &&
347
          buf[2] == 'G'))
348
        return -1;
349
    id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
350
    id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
351
    id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
352
    id3v1_get_string(str, sizeof(str), buf + 93, 4);
353
    s->year = atoi(str);
354
    id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
355
    if (buf[125] == 0 && buf[126] != 0)
356
        s->track = buf[126];
357
    genre = buf[127];
358
    if (genre <= ID3v1_GENRE_MAX)
359
        av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
360
    return 0;
361
}
362

    
363
/* mp3 read */
364

    
365
static int mp3_read_probe(AVProbeData *p)
366
{
367
    int max_frames, first_frames = 0;
368
    int fsize, frames, sample_rate;
369
    uint32_t header;
370
    uint8_t *buf, *buf2, *end;
371
    AVCodecContext avctx;
372

    
373
    if(id3v2_match(p->buf))
374
        return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
375

    
376
    max_frames = 0;
377
    buf = p->buf;
378
    end = buf + p->buf_size - sizeof(uint32_t);
379

    
380
    for(; buf < end; buf= buf2+1) {
381
        buf2 = buf;
382

    
383
        for(frames = 0; buf2 < end; frames++) {
384
            header = AV_RB32(buf2);
385
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
386
            if(fsize < 0)
387
                break;
388
            buf2 += fsize;
389
        }
390
        max_frames = FFMAX(max_frames, frames);
391
        if(buf == p->buf)
392
            first_frames= frames;
393
    }
394
    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
395
    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
396
    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
397
    else if(max_frames>=1) return 1;
398
    else                   return 0;
399
}
400

    
401
/**
402
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
403
 */
404
static void mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, offset_t base)
405
{
406
    uint32_t v, spf;
407
    int frames = -1; /* Total number of frames in file */
408
    const offset_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
409
    MPADecodeContext c;
410

    
411
    v = get_be32(s->pb);
412
    if(ff_mpa_check_header(v) < 0)
413
      return;
414

    
415
    ff_mpegaudio_decode_header(&c, v);
416
    if(c.layer != 3)
417
        return;
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;
442

    
443
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
444
    st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
445
                                st->time_base);
446
}
447

    
448
static int mp3_read_header(AVFormatContext *s,
449
                           AVFormatParameters *ap)
450
{
451
    AVStream *st;
452
    uint8_t buf[ID3v1_TAG_SIZE];
453
    int len, ret, filesize;
454
    offset_t off;
455

    
456
    st = av_new_stream(s, 0);
457
    if (!st)
458
        return AVERROR(ENOMEM);
459

    
460
    st->codec->codec_type = CODEC_TYPE_AUDIO;
461
    st->codec->codec_id = CODEC_ID_MP3;
462
    st->need_parsing = AVSTREAM_PARSE_FULL;
463
    st->start_time = 0;
464

    
465
    /* try to get the TAG */
466
    if (!url_is_streamed(s->pb)) {
467
        /* XXX: change that */
468
        filesize = url_fsize(s->pb);
469
        if (filesize > 128) {
470
            url_fseek(s->pb, filesize - 128, SEEK_SET);
471
            ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
472
            if (ret == ID3v1_TAG_SIZE) {
473
                id3v1_parse_tag(s, buf);
474
            }
475
            url_fseek(s->pb, 0, SEEK_SET);
476
        }
477
    }
478

    
479
    /* if ID3v2 header found, skip it */
480
    ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
481
    if (ret != ID3v2_HEADER_SIZE)
482
        return -1;
483
    if (id3v2_match(buf)) {
484
        /* parse ID3v2 header */
485
        len = ((buf[6] & 0x7f) << 21) |
486
            ((buf[7] & 0x7f) << 14) |
487
            ((buf[8] & 0x7f) << 7) |
488
            (buf[9] & 0x7f);
489
        id3v2_parse(s, len, buf[3], buf[5]);
490
    } else {
491
        url_fseek(s->pb, 0, SEEK_SET);
492
    }
493

    
494
    off = url_ftell(s->pb);
495
    mp3_parse_vbr_tags(s, st, off);
496
    url_fseek(s->pb, off, SEEK_SET);
497

    
498
    /* the parameters will be extracted from the compressed bitstream */
499
    return 0;
500
}
501

    
502
#define MP3_PACKET_SIZE 1024
503

    
504
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
505
{
506
    int ret, size;
507
    //    AVStream *st = s->streams[0];
508

    
509
    size= MP3_PACKET_SIZE;
510

    
511
    ret= av_get_packet(s->pb, pkt, size);
512

    
513
    pkt->stream_index = 0;
514
    if (ret <= 0) {
515
        return AVERROR(EIO);
516
    }
517
    /* note: we need to modify the packet size here to handle the last
518
       packet */
519
    pkt->size = ret;
520
    return ret;
521
}
522

    
523
#ifdef CONFIG_MUXERS
524
static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
525
{
526
    int v, i;
527

    
528
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
529
    buf[0] = 'T';
530
    buf[1] = 'A';
531
    buf[2] = 'G';
532
    strncpy(buf + 3, s->title, 30);
533
    strncpy(buf + 33, s->author, 30);
534
    strncpy(buf + 63, s->album, 30);
535
    v = s->year;
536
    if (v > 0) {
537
        for(i = 0;i < 4; i++) {
538
            buf[96 - i] = '0' + (v % 10);
539
            v = v / 10;
540
        }
541
    }
542
    strncpy(buf + 97, s->comment, 30);
543
    if (s->track != 0) {
544
        buf[125] = 0;
545
        buf[126] = s->track;
546
    }
547
    for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
548
        if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
549
            buf[127] = i;
550
            break;
551
        }
552
    }
553
}
554

    
555
/* simple formats */
556

    
557
static void id3v2_put_size(AVFormatContext *s, int size)
558
{
559
    put_byte(s->pb, size >> 21 & 0x7f);
560
    put_byte(s->pb, size >> 14 & 0x7f);
561
    put_byte(s->pb, size >> 7  & 0x7f);
562
    put_byte(s->pb, size       & 0x7f);
563
}
564

    
565
static void id3v2_put_ttag(AVFormatContext *s, const char *string, uint32_t tag)
566
{
567
    int len = strlen(string);
568
    put_be32(s->pb, tag);
569
    id3v2_put_size(s, len + 1);
570
    put_be16(s->pb, 0);
571
    put_byte(s->pb, 3); /* UTF-8 */
572
    put_buffer(s->pb, string, len);
573
}
574

    
575

    
576
/**
577
 * Write an ID3v2.4 header at beginning of stream
578
 */
579

    
580
static int mp3_write_header(struct AVFormatContext *s)
581
{
582
    int totlen = 0;
583
    char tracktxt[10];
584
    char yeartxt[10];
585

    
586
    if(s->track)
587
        snprintf(tracktxt, sizeof(tracktxt), "%d", s->track);
588
    if(s->year)
589
        snprintf( yeartxt, sizeof(yeartxt) , "%d", s->year );
590

    
591
    if(s->title[0])     totlen += 11 + strlen(s->title);
592
    if(s->author[0])    totlen += 11 + strlen(s->author);
593
    if(s->album[0])     totlen += 11 + strlen(s->album);
594
    if(s->genre[0])     totlen += 11 + strlen(s->genre);
595
    if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
596
    if(s->track)        totlen += 11 + strlen(tracktxt);
597
    if(s->year)         totlen += 11 + strlen(yeartxt);
598
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
599
        totlen += strlen(LIBAVFORMAT_IDENT) + 11;
600

    
601
    if(totlen == 0)
602
        return 0;
603

    
604
    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
605
    put_byte(s->pb, 0);
606
    put_byte(s->pb, 0); /* flags */
607

    
608
    id3v2_put_size(s, totlen);
609

    
610
    if(s->title[0])     id3v2_put_ttag(s, s->title,     MKBETAG('T', 'I', 'T', '2'));
611
    if(s->author[0])    id3v2_put_ttag(s, s->author,    MKBETAG('T', 'P', 'E', '1'));
612
    if(s->album[0])     id3v2_put_ttag(s, s->album,     MKBETAG('T', 'A', 'L', 'B'));
613
    if(s->genre[0])     id3v2_put_ttag(s, s->genre,     MKBETAG('T', 'C', 'O', 'N'));
614
    if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
615
    if(s->track)        id3v2_put_ttag(s, tracktxt,     MKBETAG('T', 'R', 'C', 'K'));
616
    if(s->year)         id3v2_put_ttag(s, yeartxt,      MKBETAG('T', 'Y', 'E', 'R'));
617
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
618
        id3v2_put_ttag(s, LIBAVFORMAT_IDENT,            MKBETAG('T', 'E', 'N', 'C'));
619
    return 0;
620
}
621

    
622
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
623
{
624
    put_buffer(s->pb, pkt->data, pkt->size);
625
    put_flush_packet(s->pb);
626
    return 0;
627
}
628

    
629
static int mp3_write_trailer(struct AVFormatContext *s)
630
{
631
    uint8_t buf[ID3v1_TAG_SIZE];
632

    
633
    /* write the id3v1 tag */
634
    if (s->title[0] != '\0') {
635
        id3v1_create_tag(s, buf);
636
        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
637
        put_flush_packet(s->pb);
638
    }
639
    return 0;
640
}
641
#endif //CONFIG_MUXERS
642

    
643
#ifdef CONFIG_MP3_DEMUXER
644
AVInputFormat mp3_demuxer = {
645
    "mp3",
646
    NULL_IF_CONFIG_SMALL("MPEG audio"),
647
    0,
648
    mp3_read_probe,
649
    mp3_read_header,
650
    mp3_read_packet,
651
    .flags= AVFMT_GENERIC_INDEX,
652
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
653
};
654
#endif
655
#ifdef CONFIG_MP2_MUXER
656
AVOutputFormat mp2_muxer = {
657
    "mp2",
658
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
659
    "audio/x-mpeg",
660
#ifdef CONFIG_LIBMP3LAME
661
    "mp2,m2a",
662
#else
663
    "mp2,mp3,m2a",
664
#endif
665
    0,
666
    CODEC_ID_MP2,
667
    CODEC_ID_NONE,
668
    NULL,
669
    mp3_write_packet,
670
    mp3_write_trailer,
671
};
672
#endif
673
#ifdef CONFIG_MP3_MUXER
674
AVOutputFormat mp3_muxer = {
675
    "mp3",
676
    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
677
    "audio/x-mpeg",
678
    "mp3",
679
    0,
680
    CODEC_ID_MP3,
681
    CODEC_ID_NONE,
682
    mp3_write_header,
683
    mp3_write_packet,
684
    mp3_write_trailer,
685
};
686
#endif