2 * MP3 muxer and demuxer
3 * Copyright (c) 2003 Fabrice Bellard.
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "mpegaudio.h"
25 #define ID3v2_HEADER_SIZE 10
26 #define ID3v1_TAG_SIZE 128
28 #define ID3v1_GENRE_MAX 125
30 static const char *id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
64 [33] = "Instrumental",
77 [46] = "Instrumental Pop",
78 [47] = "Instrumental Rock",
82 [51] = "Techno-Industrial",
87 [56] = "Southern Rock",
92 [61] = "Christian Rap",
95 [64] = "Native American",
109 [78] = "Rock & Roll",
113 [82] = "National Folk",
115 [84] = "Fast Fusion",
122 [91] = "Gothic Rock",
123 [92] = "Progressive Rock",
124 [93] = "Psychedelic Rock",
125 [94] = "Symphonic Rock",
129 [98] = "Easy Listening",
135 [104] = "Chamber Music",
138 [107] = "Booty Bass",
140 [109] = "Porn Groove",
148 [117] = "Power Ballad",
149 [118] = "Rhythmic Soul",
155 [124] = "Euro-House",
156 [125] = "Dance Hall",
159 /* buf must be ID3v2_HEADER_SIZE byte long */
160 static int id3v2_match(const uint8_t *buf)
162 return (buf[0] == 'I' &&
167 (buf[6] & 0x80) == 0 &&
168 (buf[7] & 0x80) == 0 &&
169 (buf[8] & 0x80) == 0 &&
170 (buf[9] & 0x80) == 0);
173 static unsigned int id3v2_get_size(ByteIOContext *s, int len)
177 v= (v<<7) + (get_byte(s)&0x7F);
181 static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
189 taglen--; /* account for encoding type byte */
190 dstlen--; /* Leave space for zero terminator */
192 switch(get_byte(&s->pb)) { /* encoding type */
194 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
198 PUT_UTF8(get_byte(&s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
204 len = FFMIN(taglen, dstlen);
205 get_buffer(&s->pb, dst, len);
214 * Handles ID3v2.2, 2.3 and 2.4.
218 static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
230 reason = "compression";
248 reason = "unsynchronization";
252 if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
253 url_fskip(&s->pb, id3v2_get_size(&s->pb, 4));
255 while(len >= taghdrlen) {
257 tag = get_be32(&s->pb);
258 tlen = id3v2_get_size(&s->pb, 4);
259 get_be16(&s->pb); /* flags */
261 tag = get_be24(&s->pb);
262 tlen = id3v2_get_size(&s->pb, 3);
264 len -= taghdrlen + tlen;
269 next = url_ftell(&s->pb) + tlen;
272 case MKBETAG('T', 'I', 'T', '2'):
273 case MKBETAG(0, 'T', 'T', '2'):
274 id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
276 case MKBETAG('T', 'P', 'E', '1'):
277 case MKBETAG(0, 'T', 'P', '1'):
278 id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
280 case MKBETAG('T', 'A', 'L', 'B'):
281 case MKBETAG(0, 'T', 'A', 'L'):
282 id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
284 case MKBETAG('T', 'C', 'O', 'N'):
285 case MKBETAG(0, 'T', 'C', 'O'):
286 id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
288 case MKBETAG('T', 'C', 'O', 'P'):
289 case MKBETAG(0, 'T', 'C', 'R'):
290 id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
292 case MKBETAG('T', 'R', 'C', 'K'):
293 case MKBETAG(0, 'T', 'R', 'K'):
294 id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
295 s->track = atoi(tmp);
298 /* padding, skip to end */
299 url_fskip(&s->pb, len);
303 /* Skip to end of tag */
304 url_fseek(&s->pb, next, SEEK_SET);
307 if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
308 url_fskip(&s->pb, 10);
312 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
313 url_fskip(&s->pb, len);
316 static void id3v1_get_string(char *str, int str_size,
317 const uint8_t *buf, int buf_size)
323 for(i = 0; i < buf_size; i++) {
327 if ((q - str) >= str_size - 1)
334 /* 'buf' must be ID3v1_TAG_SIZE byte long */
335 static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
340 if (!(buf[0] == 'T' &&
344 id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
345 id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
346 id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
347 id3v1_get_string(str, sizeof(str), buf + 93, 4);
349 id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
350 if (buf[125] == 0 && buf[126] != 0)
353 if (genre <= ID3v1_GENRE_MAX)
354 av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
358 static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
362 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
366 strncpy(buf + 3, s->title, 30);
367 strncpy(buf + 33, s->author, 30);
368 strncpy(buf + 63, s->album, 30);
371 for(i = 0;i < 4; i++) {
372 buf[96 - i] = '0' + (v % 10);
376 strncpy(buf + 97, s->comment, 30);
381 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
382 if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
391 static int mp3_read_probe(AVProbeData *p)
393 int max_frames, first_frames;
394 int fsize, frames, sample_rate;
396 uint8_t *buf, *buf2, *end;
397 AVCodecContext avctx;
399 if(id3v2_match(p->buf))
400 return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
404 end = buf + FFMIN(4096, p->buf_size - sizeof(uint32_t));
406 for(; buf < end; buf++) {
409 for(frames = 0; buf2 < end; frames++) {
410 header = AV_RB32(buf2);
411 fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
416 max_frames = FFMAX(max_frames, frames);
418 first_frames= frames;
420 if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
421 else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
422 else if(max_frames>=1) return 1;
426 static int mp3_read_header(AVFormatContext *s,
427 AVFormatParameters *ap)
430 uint8_t buf[ID3v1_TAG_SIZE];
431 int len, ret, filesize;
433 st = av_new_stream(s, 0);
435 return AVERROR_NOMEM;
437 st->codec->codec_type = CODEC_TYPE_AUDIO;
438 st->codec->codec_id = CODEC_ID_MP3;
439 st->need_parsing = AVSTREAM_PARSE_FULL;
441 /* try to get the TAG */
442 if (!url_is_streamed(&s->pb)) {
443 /* XXX: change that */
444 filesize = url_fsize(&s->pb);
445 if (filesize > 128) {
446 url_fseek(&s->pb, filesize - 128, SEEK_SET);
447 ret = get_buffer(&s->pb, buf, ID3v1_TAG_SIZE);
448 if (ret == ID3v1_TAG_SIZE) {
449 id3v1_parse_tag(s, buf);
451 url_fseek(&s->pb, 0, SEEK_SET);
455 /* if ID3v2 header found, skip it */
456 ret = get_buffer(&s->pb, buf, ID3v2_HEADER_SIZE);
457 if (ret != ID3v2_HEADER_SIZE)
459 if (id3v2_match(buf)) {
460 /* parse ID3v2 header */
461 len = ((buf[6] & 0x7f) << 21) |
462 ((buf[7] & 0x7f) << 14) |
463 ((buf[8] & 0x7f) << 7) |
465 id3v2_parse(s, len, buf[3], buf[5]);
467 url_fseek(&s->pb, 0, SEEK_SET);
470 /* the parameters will be extracted from the compressed bitstream */
474 #define MP3_PACKET_SIZE 1024
476 static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
479 // AVStream *st = s->streams[0];
481 size= MP3_PACKET_SIZE;
483 ret= av_get_packet(&s->pb, pkt, size);
485 pkt->stream_index = 0;
489 /* note: we need to modify the packet size here to handle the last
495 static int mp3_read_close(AVFormatContext *s)
503 static void id3v2_put_size(AVFormatContext *s, int size)
505 put_byte(&s->pb, size >> 21 & 0x7f);
506 put_byte(&s->pb, size >> 14 & 0x7f);
507 put_byte(&s->pb, size >> 7 & 0x7f);
508 put_byte(&s->pb, size & 0x7f);
511 static void id3v2_put_ttag(AVFormatContext *s, char *string, uint32_t tag)
513 int len = strlen(string);
514 put_be32(&s->pb, tag);
515 id3v2_put_size(s, len + 1);
517 put_byte(&s->pb, 3); /* UTF-8 */
518 put_buffer(&s->pb, string, len);
523 * Write an ID3v2.4 header at beginning of stream
526 static int mp3_write_header(struct AVFormatContext *s)
532 snprintf(tracktxt, sizeof(tracktxt) - 1, "%d", s->track);
534 if(s->title[0]) totlen += 11 + strlen(s->title);
535 if(s->author[0]) totlen += 11 + strlen(s->author);
536 if(s->album[0]) totlen += 11 + strlen(s->album);
537 if(s->genre[0]) totlen += 11 + strlen(s->genre);
538 if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
539 if(s->track) totlen += 11 + strlen(tracktxt);
540 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
541 totlen += strlen(LIBAVFORMAT_IDENT) + 11;
546 put_be32(&s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
548 put_byte(&s->pb, 0); /* flags */
550 id3v2_put_size(s, totlen);
552 if(s->title[0]) id3v2_put_ttag(s, s->title, MKBETAG('T', 'I', 'T', '2'));
553 if(s->author[0]) id3v2_put_ttag(s, s->author, MKBETAG('T', 'P', 'E', '1'));
554 if(s->album[0]) id3v2_put_ttag(s, s->album, MKBETAG('T', 'A', 'L', 'B'));
555 if(s->genre[0]) id3v2_put_ttag(s, s->genre, MKBETAG('T', 'C', 'O', 'N'));
556 if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
557 if(s->track) id3v2_put_ttag(s, tracktxt, MKBETAG('T', 'R', 'C', 'K'));
558 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
559 id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C'));
563 static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
565 put_buffer(&s->pb, pkt->data, pkt->size);
566 put_flush_packet(&s->pb);
570 static int mp3_write_trailer(struct AVFormatContext *s)
572 uint8_t buf[ID3v1_TAG_SIZE];
574 /* write the id3v1 tag */
575 if (s->title[0] != '\0') {
576 id3v1_create_tag(s, buf);
577 put_buffer(&s->pb, buf, ID3v1_TAG_SIZE);
578 put_flush_packet(&s->pb);
582 #endif //CONFIG_MUXERS
584 #ifdef CONFIG_MP3_DEMUXER
585 AVInputFormat mp3_demuxer = {
593 .flags= AVFMT_GENERIC_INDEX,
594 .extensions = "mp2,mp3,m2a", /* XXX: use probe */
597 #ifdef CONFIG_MP2_MUXER
598 AVOutputFormat mp2_muxer = {
600 "MPEG audio layer 2",
602 #ifdef CONFIG_LIBMP3LAME
615 #ifdef CONFIG_MP3_MUXER
616 AVOutputFormat mp3_muxer = {
618 "MPEG audio layer 3",