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