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
23 #include "libavutil/avstring.h"
24 #include "libavcodec/mpegaudio.h"
25 #include "libavcodec/mpegaudiodecheader.h"
29 #define ID3v1_TAG_SIZE 128
31 #define ID3v1_GENRE_MAX 125
33 static const char * const id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
67 [33] = "Instrumental",
80 [46] = "Instrumental Pop",
81 [47] = "Instrumental Rock",
85 [51] = "Techno-Industrial",
90 [56] = "Southern Rock",
95 [61] = "Christian Rap",
98 [64] = "Native American",
101 [67] = "Psychadelic",
112 [78] = "Rock & Roll",
116 [82] = "National Folk",
118 [84] = "Fast Fusion",
125 [91] = "Gothic Rock",
126 [92] = "Progressive Rock",
127 [93] = "Psychedelic Rock",
128 [94] = "Symphonic Rock",
132 [98] = "Easy Listening",
138 [104] = "Chamber Music",
141 [107] = "Booty Bass",
143 [109] = "Porn Groove",
151 [117] = "Power Ballad",
152 [118] = "Rhythmic Soul",
158 [124] = "Euro-House",
159 [125] = "Dance Hall",
162 static unsigned int id3v2_get_size(ByteIOContext *s, int len)
166 v= (v<<7) + (get_byte(s)&0x7F);
170 static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
180 taglen--; /* account for encoding type byte */
181 dstlen--; /* Leave space for zero terminator */
183 switch(get_byte(s->pb)) { /* encoding type */
185 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
189 PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
195 len = FFMIN(taglen, dstlen-1);
196 get_buffer(s->pb, dst, len);
205 * Handles ID3v2.2, 2.3 and 2.4.
209 static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
221 reason = "compression";
240 reason = "unsynchronization";
244 if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
245 url_fskip(s->pb, id3v2_get_size(s->pb, 4));
247 while(len >= taghdrlen) {
249 tag = get_be32(s->pb);
250 tlen = id3v2_get_size(s->pb, 4);
251 get_be16(s->pb); /* flags */
253 tag = get_be24(s->pb);
254 tlen = id3v2_get_size(s->pb, 3);
256 len -= taghdrlen + tlen;
261 next = url_ftell(s->pb) + tlen;
264 case MKBETAG('T', 'I', 'T', '2'):
265 case MKBETAG(0, 'T', 'T', '2'):
266 id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
268 case MKBETAG('T', 'P', 'E', '1'):
269 case MKBETAG(0, 'T', 'P', '1'):
270 id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
272 case MKBETAG('T', 'A', 'L', 'B'):
273 case MKBETAG(0, 'T', 'A', 'L'):
274 id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
276 case MKBETAG('T', 'C', 'O', 'N'):
277 case MKBETAG(0, 'T', 'C', 'O'):
278 id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
280 case MKBETAG('T', 'C', 'O', 'P'):
281 case MKBETAG(0, 'T', 'C', 'R'):
282 id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
284 case MKBETAG('T', 'R', 'C', 'K'):
285 case MKBETAG(0, 'T', 'R', 'K'):
286 id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
287 s->track = atoi(tmp);
290 /* padding, skip to end */
291 url_fskip(s->pb, len);
295 /* Skip to end of tag */
296 url_fseek(s->pb, next, SEEK_SET);
299 if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
300 url_fskip(s->pb, 10);
304 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
305 url_fskip(s->pb, len);
308 static void id3v1_get_string(char *str, int str_size,
309 const uint8_t *buf, int buf_size)
315 for(i = 0; i < buf_size; i++) {
319 if ((q - str) >= str_size - 1)
326 /* 'buf' must be ID3v1_TAG_SIZE byte long */
327 static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
332 if (!(buf[0] == 'T' &&
336 id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
337 id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
338 id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
339 id3v1_get_string(str, sizeof(str), buf + 93, 4);
341 id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
342 if (buf[125] == 0 && buf[126] != 0)
345 if (genre <= ID3v1_GENRE_MAX)
346 av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
352 static int mp3_read_probe(AVProbeData *p)
354 int max_frames, first_frames = 0;
355 int fsize, frames, sample_rate;
357 uint8_t *buf, *buf2, *end;
358 AVCodecContext avctx;
360 if(ff_id3v2_match(p->buf))
361 return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
365 end = buf + p->buf_size - sizeof(uint32_t);
367 for(; buf < end; buf= buf2+1) {
370 for(frames = 0; buf2 < end; frames++) {
371 header = AV_RB32(buf2);
372 fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
377 max_frames = FFMAX(max_frames, frames);
379 first_frames= frames;
381 if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
382 else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
383 else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
384 else if(max_frames>=1) return 1;
389 * Try to find Xing/Info/VBRI tags and compute duration from info therein
391 static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
394 int frames = -1; /* Total number of frames in file */
395 const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
400 if(ff_mpa_check_header(v) < 0)
403 if (ff_mpegaudio_decode_header(&c, v) == 0)
404 vbrtag_size = c.frame_size;
408 /* Check for Xing / Info tag */
409 url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
411 if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
414 frames = get_be32(s->pb);
417 /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
418 url_fseek(s->pb, base + 4 + 32, SEEK_SET);
420 if(v == MKBETAG('V', 'B', 'R', 'I')) {
421 /* Check tag version */
422 if(get_be16(s->pb) == 1) {
423 /* skip delay, quality and total bytes */
424 url_fseek(s->pb, 8, SEEK_CUR);
425 frames = get_be32(s->pb);
432 /* Skip the vbr tag frame */
433 url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
435 spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
436 st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
441 static int mp3_read_header(AVFormatContext *s,
442 AVFormatParameters *ap)
445 uint8_t buf[ID3v1_TAG_SIZE];
446 int len, ret, filesize;
449 st = av_new_stream(s, 0);
451 return AVERROR(ENOMEM);
453 st->codec->codec_type = CODEC_TYPE_AUDIO;
454 st->codec->codec_id = CODEC_ID_MP3;
455 st->need_parsing = AVSTREAM_PARSE_FULL;
458 /* try to get the TAG */
459 if (!url_is_streamed(s->pb)) {
460 /* XXX: change that */
461 filesize = url_fsize(s->pb);
462 if (filesize > 128) {
463 url_fseek(s->pb, filesize - 128, SEEK_SET);
464 ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
465 if (ret == ID3v1_TAG_SIZE) {
466 id3v1_parse_tag(s, buf);
468 url_fseek(s->pb, 0, SEEK_SET);
472 /* if ID3v2 header found, skip it */
473 ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
474 if (ret != ID3v2_HEADER_SIZE)
476 if (ff_id3v2_match(buf)) {
477 /* parse ID3v2 header */
478 len = ((buf[6] & 0x7f) << 21) |
479 ((buf[7] & 0x7f) << 14) |
480 ((buf[8] & 0x7f) << 7) |
482 id3v2_parse(s, len, buf[3], buf[5]);
484 url_fseek(s->pb, 0, SEEK_SET);
487 off = url_ftell(s->pb);
488 if (mp3_parse_vbr_tags(s, st, off) < 0)
489 url_fseek(s->pb, off, SEEK_SET);
491 /* the parameters will be extracted from the compressed bitstream */
495 #define MP3_PACKET_SIZE 1024
497 static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
500 // AVStream *st = s->streams[0];
502 size= MP3_PACKET_SIZE;
504 ret= av_get_packet(s->pb, pkt, size);
506 pkt->stream_index = 0;
510 /* note: we need to modify the packet size here to handle the last
516 #if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER
517 static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
521 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
525 strncpy(buf + 3, s->title, 30);
526 strncpy(buf + 33, s->author, 30);
527 strncpy(buf + 63, s->album, 30);
530 for(i = 0;i < 4; i++) {
531 buf[96 - i] = '0' + (v % 10);
535 strncpy(buf + 97, s->comment, 30);
540 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
541 if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
550 static void id3v2_put_size(AVFormatContext *s, int size)
552 put_byte(s->pb, size >> 21 & 0x7f);
553 put_byte(s->pb, size >> 14 & 0x7f);
554 put_byte(s->pb, size >> 7 & 0x7f);
555 put_byte(s->pb, size & 0x7f);
558 static void id3v2_put_ttag(AVFormatContext *s, const char *string, uint32_t tag)
560 int len = strlen(string);
561 put_be32(s->pb, tag);
562 id3v2_put_size(s, len + 1);
564 put_byte(s->pb, 3); /* UTF-8 */
565 put_buffer(s->pb, string, len);
570 * Write an ID3v2.4 header at beginning of stream
573 static int mp3_write_header(struct AVFormatContext *s)
580 snprintf(tracktxt, sizeof(tracktxt), "%d", s->track);
582 snprintf( yeartxt, sizeof(yeartxt) , "%d", s->year );
584 if(s->title[0]) totlen += 11 + strlen(s->title);
585 if(s->author[0]) totlen += 11 + strlen(s->author);
586 if(s->album[0]) totlen += 11 + strlen(s->album);
587 if(s->genre[0]) totlen += 11 + strlen(s->genre);
588 if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
589 if(s->track) totlen += 11 + strlen(tracktxt);
590 if(s->year) totlen += 11 + strlen(yeartxt);
591 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
592 totlen += strlen(LIBAVFORMAT_IDENT) + 11;
597 put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
599 put_byte(s->pb, 0); /* flags */
601 id3v2_put_size(s, totlen);
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->year) id3v2_put_ttag(s, yeartxt, MKBETAG('T', 'Y', 'E', 'R'));
610 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
611 id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C'));
615 static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
617 put_buffer(s->pb, pkt->data, pkt->size);
618 put_flush_packet(s->pb);
622 static int mp3_write_trailer(struct AVFormatContext *s)
624 uint8_t buf[ID3v1_TAG_SIZE];
626 /* write the id3v1 tag */
627 if (s->title[0] != '\0') {
628 id3v1_create_tag(s, buf);
629 put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
630 put_flush_packet(s->pb);
634 #endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */
636 #if CONFIG_MP3_DEMUXER
637 AVInputFormat mp3_demuxer = {
639 NULL_IF_CONFIG_SMALL("MPEG audio"),
644 .flags= AVFMT_GENERIC_INDEX,
645 .extensions = "mp2,mp3,m2a", /* XXX: use probe */
649 AVOutputFormat mp2_muxer = {
651 NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
653 #if CONFIG_LIBMP3LAME
667 AVOutputFormat mp3_muxer = {
669 NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),