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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
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 * 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

    
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
static 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

    
170
static 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 || sscanf(dst, "%d", &genre) == 1)
202
        && genre <= ID3v1_GENRE_MAX)
203
        av_strlcpy(dst, id3v1_genre_str[genre], sizeof(dst));
204

    
205
    if (*dst)
206
        av_metadata_set(&s->metadata, key, dst);
207
}
208

    
209
/**
210
 * ID3v2 parser
211
 *
212
 * Handles ID3v2.2, 2.3 and 2.4.
213
 *
214
 */
215

    
216
static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
217
{
218
    int isv34, tlen;
219
    uint32_t tag;
220
    int64_t next;
221
    int taghdrlen;
222
    const char *reason;
223

    
224
    switch(version) {
225
    case 2:
226
        if(flags & 0x40) {
227
            reason = "compression";
228
            goto error;
229
        }
230
        isv34 = 0;
231
        taghdrlen = 6;
232
        break;
233

    
234
    case 3:
235
    case 4:
236
        isv34 = 1;
237
        taghdrlen = 10;
238
        break;
239

    
240
    default:
241
        reason = "version";
242
        goto error;
243
    }
244

    
245
    if(flags & 0x80) {
246
        reason = "unsynchronization";
247
        goto error;
248
    }
249

    
250
    if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
251
        url_fskip(s->pb, id3v2_get_size(s->pb, 4));
252

    
253
    while(len >= taghdrlen) {
254
        if(isv34) {
255
            tag  = get_be32(s->pb);
256
            tlen = id3v2_get_size(s->pb, 4);
257
            get_be16(s->pb); /* flags */
258
        } else {
259
            tag  = get_be24(s->pb);
260
            tlen = id3v2_get_size(s->pb, 3);
261
        }
262
        len -= taghdrlen + tlen;
263

    
264
        if(len < 0)
265
            break;
266

    
267
        next = url_ftell(s->pb) + tlen;
268

    
269
        switch(tag) {
270
        case MKBETAG('T', 'I', 'T', '2'):
271
        case MKBETAG(0,   'T', 'T', '2'):
272
            id3v2_read_ttag(s, tlen, "title");
273
            break;
274
        case MKBETAG('T', 'P', 'E', '1'):
275
        case MKBETAG(0,   'T', 'P', '1'):
276
            id3v2_read_ttag(s, tlen, "author");
277
            break;
278
        case MKBETAG('T', 'A', 'L', 'B'):
279
        case MKBETAG(0,   'T', 'A', 'L'):
280
            id3v2_read_ttag(s, tlen, "album");
281
            break;
282
        case MKBETAG('T', 'C', 'O', 'N'):
283
        case MKBETAG(0,   'T', 'C', 'O'):
284
            id3v2_read_ttag(s, tlen, "genre");
285
            break;
286
        case MKBETAG('T', 'C', 'O', 'P'):
287
        case MKBETAG(0,   'T', 'C', 'R'):
288
            id3v2_read_ttag(s, tlen, "copyright");
289
            break;
290
        case MKBETAG('T', 'R', 'C', 'K'):
291
        case MKBETAG(0,   'T', 'R', 'K'):
292
            id3v2_read_ttag(s, tlen, "track");
293
            break;
294
        case 0:
295
            /* padding, skip to end */
296
            url_fskip(s->pb, len);
297
            len = 0;
298
            continue;
299
        }
300
        /* Skip to end of tag */
301
        url_fseek(s->pb, next, SEEK_SET);
302
    }
303

    
304
    if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
305
        url_fskip(s->pb, 10);
306
    return;
307

    
308
  error:
309
    av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
310
    url_fskip(s->pb, len);
311
}
312

    
313
static void id3v1_get_string(AVFormatContext *s, const char *key,
314
                             const uint8_t *buf, int buf_size)
315
{
316
    int i, c;
317
    char *q, str[512];
318

    
319
    q = str;
320
    for(i = 0; i < buf_size; i++) {
321
        c = buf[i];
322
        if (c == '\0')
323
            break;
324
        if ((q - str) >= sizeof(str) - 1)
325
            break;
326
        *q++ = c;
327
    }
328
    *q = '\0';
329

    
330
    if (*str)
331
        av_metadata_set(&s->metadata, key, str);
332
}
333

    
334
/* 'buf' must be ID3v1_TAG_SIZE byte long */
335
static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
336
{
337
    char str[5];
338
    int genre;
339

    
340
    if (!(buf[0] == 'T' &&
341
          buf[1] == 'A' &&
342
          buf[2] == 'G'))
343
        return -1;
344
    id3v1_get_string(s, "title",   buf +  3, 30);
345
    id3v1_get_string(s, "author",  buf + 33, 30);
346
    id3v1_get_string(s, "album",   buf + 63, 30);
347
    id3v1_get_string(s, "year",    buf + 93,  4);
348
    id3v1_get_string(s, "comment", buf + 97, 30);
349
    if (buf[125] == 0 && buf[126] != 0) {
350
        snprintf(str, sizeof(str), "%d", buf[126]);
351
        av_metadata_set(&s->metadata, "track", str);
352
    }
353
    genre = buf[127];
354
    if (genre <= ID3v1_GENRE_MAX)
355
        av_metadata_set(&s->metadata, "genre", id3v1_genre_str[genre]);
356
    return 0;
357
}
358

    
359
/* mp3 read */
360

    
361
static int mp3_read_probe(AVProbeData *p)
362
{
363
    int max_frames, first_frames = 0;
364
    int fsize, frames, sample_rate;
365
    uint32_t header;
366
    uint8_t *buf, *buf0, *buf2, *end;
367
    AVCodecContext avctx;
368

    
369
    buf0 = p->buf;
370
    if(ff_id3v2_match(buf0)) {
371
        buf0 += ff_id3v2_tag_len(buf0);
372
    }
373

    
374
    max_frames = 0;
375
    buf = buf0;
376
    end = p->buf + p->buf_size - sizeof(uint32_t);
377

    
378
    for(; buf < end; buf= buf2+1) {
379
        buf2 = buf;
380

    
381
        for(frames = 0; buf2 < end; frames++) {
382
            header = AV_RB32(buf2);
383
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
384
            if(fsize < 0)
385
                break;
386
            buf2 += fsize;
387
        }
388
        max_frames = FFMAX(max_frames, frames);
389
        if(buf == buf0)
390
            first_frames= frames;
391
    }
392
    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
393
    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
394
    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
395
    else if(buf0!=p->buf)  return AVPROBE_SCORE_MAX/4-1;
396
    else if(max_frames>=1) return 1;
397
    else                   return 0;
398
}
399

    
400
/**
401
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
402
 */
403
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
404
{
405
    uint32_t v, spf;
406
    int frames = -1; /* Total number of frames in file */
407
    const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
408
    MPADecodeHeader c;
409
    int vbrtag_size = 0;
410

    
411
    v = get_be32(s->pb);
412
    if(ff_mpa_check_header(v) < 0)
413
      return -1;
414

    
415
    if (ff_mpegaudio_decode_header(&c, v) == 0)
416
        vbrtag_size = c.frame_size;
417
    if(c.layer != 3)
418
        return -1;
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 -1;
443

    
444
    /* Skip the vbr tag frame */
445
    url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
446

    
447
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
448
    st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
449
                                st->time_base);
450
    return 0;
451
}
452

    
453
static int mp3_read_header(AVFormatContext *s,
454
                           AVFormatParameters *ap)
455
{
456
    AVStream *st;
457
    uint8_t buf[ID3v1_TAG_SIZE];
458
    int len, ret, filesize;
459
    int64_t off;
460

    
461
    st = av_new_stream(s, 0);
462
    if (!st)
463
        return AVERROR(ENOMEM);
464

    
465
    st->codec->codec_type = CODEC_TYPE_AUDIO;
466
    st->codec->codec_id = CODEC_ID_MP3;
467
    st->need_parsing = AVSTREAM_PARSE_FULL;
468
    st->start_time = 0;
469

    
470
    /* try to get the TAG */
471
    if (!url_is_streamed(s->pb)) {
472
        /* XXX: change that */
473
        filesize = url_fsize(s->pb);
474
        if (filesize > 128) {
475
            url_fseek(s->pb, filesize - 128, SEEK_SET);
476
            ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
477
            if (ret == ID3v1_TAG_SIZE) {
478
                id3v1_parse_tag(s, buf);
479
            }
480
            url_fseek(s->pb, 0, SEEK_SET);
481
        }
482
    }
483

    
484
    /* if ID3v2 header found, skip it */
485
    ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
486
    if (ret != ID3v2_HEADER_SIZE)
487
        return -1;
488
    if (ff_id3v2_match(buf)) {
489
        /* parse ID3v2 header */
490
        len = ((buf[6] & 0x7f) << 21) |
491
            ((buf[7] & 0x7f) << 14) |
492
            ((buf[8] & 0x7f) << 7) |
493
            (buf[9] & 0x7f);
494
        id3v2_parse(s, len, buf[3], buf[5]);
495
    } else {
496
        url_fseek(s->pb, 0, SEEK_SET);
497
    }
498

    
499
    off = url_ftell(s->pb);
500
    if (mp3_parse_vbr_tags(s, st, off) < 0)
501
        url_fseek(s->pb, off, SEEK_SET);
502

    
503
    /* the parameters will be extracted from the compressed bitstream */
504
    return 0;
505
}
506

    
507
#define MP3_PACKET_SIZE 1024
508

    
509
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
510
{
511
    int ret, size;
512
    //    AVStream *st = s->streams[0];
513

    
514
    size= MP3_PACKET_SIZE;
515

    
516
    ret= av_get_packet(s->pb, pkt, size);
517

    
518
    pkt->stream_index = 0;
519
    if (ret <= 0) {
520
        return AVERROR(EIO);
521
    }
522
    /* note: we need to modify the packet size here to handle the last
523
       packet */
524
    pkt->size = ret;
525
    return ret;
526
}
527

    
528
#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER
529
static int id3v1_set_string(AVFormatContext *s, const char *key,
530
                            uint8_t *buf, int buf_size)
531
{
532
    AVMetadataTag *tag;
533
    if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
534
        strncpy(buf, tag->value, buf_size);
535
    return !!tag;
536
}
537

    
538
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
539
{
540
    AVMetadataTag *tag;
541
    int i, count = 0;
542

    
543
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
544
    buf[0] = 'T';
545
    buf[1] = 'A';
546
    buf[2] = 'G';
547
    count += id3v1_set_string(s, "title",   buf +  3, 30);
548
    count += id3v1_set_string(s, "author",  buf + 33, 30);
549
    count += id3v1_set_string(s, "album",   buf + 63, 30);
550
    count += id3v1_set_string(s, "year",    buf + 93,  4);
551
    count += id3v1_set_string(s, "comment", buf + 97, 30);
552
    if ((tag = av_metadata_get(s->metadata, "track", NULL, 0))) {
553
        buf[125] = 0;
554
        buf[126] = atoi(tag->value);
555
        count++;
556
    }
557
    if ((tag = av_metadata_get(s->metadata, "genre", NULL, 0))) {
558
        for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
559
            if (!strcasecmp(tag->value, id3v1_genre_str[i])) {
560
                buf[127] = i;
561
                count++;
562
                break;
563
            }
564
        }
565
    }
566
    return count;
567
}
568

    
569
/* simple formats */
570

    
571
static void id3v2_put_size(AVFormatContext *s, int size)
572
{
573
    put_byte(s->pb, size >> 21 & 0x7f);
574
    put_byte(s->pb, size >> 14 & 0x7f);
575
    put_byte(s->pb, size >> 7  & 0x7f);
576
    put_byte(s->pb, size       & 0x7f);
577
}
578

    
579
static void id3v2_put_ttag(AVFormatContext *s, const char *string, uint32_t tag)
580
{
581
    int len = strlen(string);
582
    put_be32(s->pb, tag);
583
    id3v2_put_size(s, len + 1);
584
    put_be16(s->pb, 0);
585
    put_byte(s->pb, 3); /* UTF-8 */
586
    put_buffer(s->pb, string, len);
587
}
588

    
589

    
590
/**
591
 * Write an ID3v2.4 header at beginning of stream
592
 */
593

    
594
static int mp3_write_header(struct AVFormatContext *s)
595
{
596
    AVMetadataTag *title, *author, *album, *genre, *copyright, *track, *year;
597
    int totlen = 0;
598

    
599
    title     = av_metadata_get(s->metadata, "title",     NULL, 0);
600
    author    = av_metadata_get(s->metadata, "author",    NULL, 0);
601
    album     = av_metadata_get(s->metadata, "album",     NULL, 0);
602
    genre     = av_metadata_get(s->metadata, "genre",     NULL, 0);
603
    copyright = av_metadata_get(s->metadata, "copyright", NULL, 0);
604
    track     = av_metadata_get(s->metadata, "track",     NULL, 0);
605
    year      = av_metadata_get(s->metadata, "year",      NULL, 0);
606

    
607
    if(title)     totlen += 11 + strlen(title->value);
608
    if(author)    totlen += 11 + strlen(author->value);
609
    if(album)     totlen += 11 + strlen(album->value);
610
    if(genre)     totlen += 11 + strlen(genre->value);
611
    if(copyright) totlen += 11 + strlen(copyright->value);
612
    if(track)     totlen += 11 + strlen(track->value);
613
    if(year)      totlen += 11 + strlen(year->value);
614
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
615
        totlen += strlen(LIBAVFORMAT_IDENT) + 11;
616

    
617
    if(totlen == 0)
618
        return 0;
619

    
620
    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
621
    put_byte(s->pb, 0);
622
    put_byte(s->pb, 0); /* flags */
623

    
624
    id3v2_put_size(s, totlen);
625

    
626
    if(title)     id3v2_put_ttag(s, title->value,     MKBETAG('T', 'I', 'T', '2'));
627
    if(author)    id3v2_put_ttag(s, author->value,    MKBETAG('T', 'P', 'E', '1'));
628
    if(album)     id3v2_put_ttag(s, album->value,     MKBETAG('T', 'A', 'L', 'B'));
629
    if(genre)     id3v2_put_ttag(s, genre->value,     MKBETAG('T', 'C', 'O', 'N'));
630
    if(copyright) id3v2_put_ttag(s, copyright->value, MKBETAG('T', 'C', 'O', 'P'));
631
    if(track)     id3v2_put_ttag(s, track->value,     MKBETAG('T', 'R', 'C', 'K'));
632
    if(year)      id3v2_put_ttag(s, year->value,      MKBETAG('T', 'Y', 'E', 'R'));
633
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
634
        id3v2_put_ttag(s, LIBAVFORMAT_IDENT,            MKBETAG('T', 'E', 'N', 'C'));
635
    return 0;
636
}
637

    
638
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
639
{
640
    put_buffer(s->pb, pkt->data, pkt->size);
641
    put_flush_packet(s->pb);
642
    return 0;
643
}
644

    
645
static int mp3_write_trailer(struct AVFormatContext *s)
646
{
647
    uint8_t buf[ID3v1_TAG_SIZE];
648

    
649
    /* write the id3v1 tag */
650
    if (id3v1_create_tag(s, buf) > 0) {
651
        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
652
        put_flush_packet(s->pb);
653
    }
654
    return 0;
655
}
656
#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */
657

    
658
#if CONFIG_MP3_DEMUXER
659
AVInputFormat mp3_demuxer = {
660
    "mp3",
661
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
662
    0,
663
    mp3_read_probe,
664
    mp3_read_header,
665
    mp3_read_packet,
666
    .flags= AVFMT_GENERIC_INDEX,
667
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
668
};
669
#endif
670
#if CONFIG_MP2_MUXER
671
AVOutputFormat mp2_muxer = {
672
    "mp2",
673
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
674
    "audio/x-mpeg",
675
    "mp2,m2a",
676
    0,
677
    CODEC_ID_MP2,
678
    CODEC_ID_NONE,
679
    NULL,
680
    mp3_write_packet,
681
    mp3_write_trailer,
682
};
683
#endif
684
#if CONFIG_MP3_MUXER
685
AVOutputFormat mp3_muxer = {
686
    "mp3",
687
    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
688
    "audio/x-mpeg",
689
    "mp3",
690
    0,
691
    CODEC_ID_MP3,
692
    CODEC_ID_NONE,
693
    mp3_write_header,
694
    mp3_write_packet,
695
    mp3_write_trailer,
696
};
697
#endif