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"
24 #include "mpegaudiodecheader.h"
26 #define ID3v2_HEADER_SIZE 10
27 #define ID3v1_TAG_SIZE 128
29 #define ID3v1_GENRE_MAX 125
31 static const char *id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
65 [33] = "Instrumental",
78 [46] = "Instrumental Pop",
79 [47] = "Instrumental Rock",
83 [51] = "Techno-Industrial",
88 [56] = "Southern Rock",
93 [61] = "Christian Rap",
96 [64] = "Native American",
110 [78] = "Rock & Roll",
114 [82] = "National Folk",
116 [84] = "Fast Fusion",
123 [91] = "Gothic Rock",
124 [92] = "Progressive Rock",
125 [93] = "Psychedelic Rock",
126 [94] = "Symphonic Rock",
130 [98] = "Easy Listening",
136 [104] = "Chamber Music",
139 [107] = "Booty Bass",
141 [109] = "Porn Groove",
149 [117] = "Power Ballad",
150 [118] = "Rhythmic Soul",
156 [124] = "Euro-House",
157 [125] = "Dance Hall",
160 /* buf must be ID3v2_HEADER_SIZE byte long */
161 static int id3v2_match(const uint8_t *buf)
163 return (buf[0] == 'I' &&
168 (buf[6] & 0x80) == 0 &&
169 (buf[7] & 0x80) == 0 &&
170 (buf[8] & 0x80) == 0 &&
171 (buf[9] & 0x80) == 0);
174 static unsigned int id3v2_get_size(ByteIOContext *s, int len)
178 v= (v<<7) + (get_byte(s)&0x7F);
182 static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
190 taglen--; /* account for encoding type byte */
191 dstlen--; /* Leave space for zero terminator */
193 switch(get_byte(s->pb)) { /* encoding type */
195 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
199 PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
205 len = FFMIN(taglen, dstlen);
206 get_buffer(s->pb, dst, len);
215 * Handles ID3v2.2, 2.3 and 2.4.
219 static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
231 reason = "compression";
250 reason = "unsynchronization";
254 if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
255 url_fskip(s->pb, id3v2_get_size(s->pb, 4));
257 while(len >= taghdrlen) {
259 tag = get_be32(s->pb);
260 tlen = id3v2_get_size(s->pb, 4);
261 get_be16(s->pb); /* flags */
263 tag = get_be24(s->pb);
264 tlen = id3v2_get_size(s->pb, 3);
266 len -= taghdrlen + tlen;
271 next = url_ftell(s->pb) + tlen;
274 case MKBETAG('T', 'I', 'T', '2'):
275 case MKBETAG(0, 'T', 'T', '2'):
276 id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
278 case MKBETAG('T', 'P', 'E', '1'):
279 case MKBETAG(0, 'T', 'P', '1'):
280 id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
282 case MKBETAG('T', 'A', 'L', 'B'):
283 case MKBETAG(0, 'T', 'A', 'L'):
284 id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
286 case MKBETAG('T', 'C', 'O', 'N'):
287 case MKBETAG(0, 'T', 'C', 'O'):
288 id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
290 case MKBETAG('T', 'C', 'O', 'P'):
291 case MKBETAG(0, 'T', 'C', 'R'):
292 id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
294 case MKBETAG('T', 'R', 'C', 'K'):
295 case MKBETAG(0, 'T', 'R', 'K'):
296 id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
297 s->track = atoi(tmp);
300 /* padding, skip to end */
301 url_fskip(s->pb, len);
305 /* Skip to end of tag */
306 url_fseek(s->pb, next, SEEK_SET);
309 if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
310 url_fskip(s->pb, 10);
314 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
315 url_fskip(s->pb, len);
318 static void id3v1_get_string(char *str, int str_size,
319 const uint8_t *buf, int buf_size)
325 for(i = 0; i < buf_size; i++) {
329 if ((q - str) >= str_size - 1)
336 /* 'buf' must be ID3v1_TAG_SIZE byte long */
337 static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
342 if (!(buf[0] == 'T' &&
346 id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
347 id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
348 id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
349 id3v1_get_string(str, sizeof(str), buf + 93, 4);
351 id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
352 if (buf[125] == 0 && buf[126] != 0)
355 if (genre <= ID3v1_GENRE_MAX)
356 av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
360 static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
364 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
368 strncpy(buf + 3, s->title, 30);
369 strncpy(buf + 33, s->author, 30);
370 strncpy(buf + 63, s->album, 30);
373 for(i = 0;i < 4; i++) {
374 buf[96 - i] = '0' + (v % 10);
378 strncpy(buf + 97, s->comment, 30);
383 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
384 if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
393 static int mp3_read_probe(AVProbeData *p)
395 int max_frames, first_frames = 0;
396 int fsize, frames, sample_rate;
398 uint8_t *buf, *buf2, *end;
399 AVCodecContext avctx;
401 if(id3v2_match(p->buf))
402 return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
406 end = buf + FFMIN(4096, p->buf_size - sizeof(uint32_t));
408 for(; buf < end; buf++) {
411 for(frames = 0; buf2 < end; frames++) {
412 header = AV_RB32(buf2);
413 fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
418 max_frames = FFMAX(max_frames, frames);
420 first_frames= frames;
422 if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
423 else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
424 else if(max_frames>=1) return 1;
429 * Try to find Xing/Info/VBRI tags and compute duration from info therein
431 static void mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, offset_t base)
434 int frames = -1; /* Total number of frames in file */
435 const offset_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
439 if(ff_mpa_check_header(v) < 0)
442 ff_mpegaudio_decode_header(&c, v);
446 /* Check for Xing / Info tag */
447 url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
449 if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
452 frames = get_be32(s->pb);
455 /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
456 url_fseek(s->pb, base + 4 + 32, SEEK_SET);
458 if(v == MKBETAG('V', 'B', 'R', 'I')) {
459 /* Check tag version */
460 if(get_be16(s->pb) == 1) {
461 /* skip delay, quality and total bytes */
462 url_fseek(s->pb, 8, SEEK_CUR);
463 frames = get_be32(s->pb);
470 spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
471 st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
475 static int mp3_read_header(AVFormatContext *s,
476 AVFormatParameters *ap)
479 uint8_t buf[ID3v1_TAG_SIZE];
480 int len, ret, filesize;
483 st = av_new_stream(s, 0);
485 return AVERROR(ENOMEM);
487 st->codec->codec_type = CODEC_TYPE_AUDIO;
488 st->codec->codec_id = CODEC_ID_MP3;
489 st->need_parsing = AVSTREAM_PARSE_FULL;
492 /* try to get the TAG */
493 if (!url_is_streamed(s->pb)) {
494 /* XXX: change that */
495 filesize = url_fsize(s->pb);
496 if (filesize > 128) {
497 url_fseek(s->pb, filesize - 128, SEEK_SET);
498 ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
499 if (ret == ID3v1_TAG_SIZE) {
500 id3v1_parse_tag(s, buf);
502 url_fseek(s->pb, 0, SEEK_SET);
506 /* if ID3v2 header found, skip it */
507 ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
508 if (ret != ID3v2_HEADER_SIZE)
510 if (id3v2_match(buf)) {
511 /* parse ID3v2 header */
512 len = ((buf[6] & 0x7f) << 21) |
513 ((buf[7] & 0x7f) << 14) |
514 ((buf[8] & 0x7f) << 7) |
516 id3v2_parse(s, len, buf[3], buf[5]);
518 url_fseek(s->pb, 0, SEEK_SET);
521 off = url_ftell(s->pb);
522 mp3_parse_vbr_tags(s, st, off);
523 url_fseek(s->pb, off, SEEK_SET);
525 /* the parameters will be extracted from the compressed bitstream */
529 #define MP3_PACKET_SIZE 1024
531 static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
534 // AVStream *st = s->streams[0];
536 size= MP3_PACKET_SIZE;
538 ret= av_get_packet(s->pb, pkt, size);
540 pkt->stream_index = 0;
544 /* note: we need to modify the packet size here to handle the last
550 static int mp3_read_close(AVFormatContext *s)
558 static void id3v2_put_size(AVFormatContext *s, int size)
560 put_byte(s->pb, size >> 21 & 0x7f);
561 put_byte(s->pb, size >> 14 & 0x7f);
562 put_byte(s->pb, size >> 7 & 0x7f);
563 put_byte(s->pb, size & 0x7f);
566 static void id3v2_put_ttag(AVFormatContext *s, char *string, uint32_t tag)
568 int len = strlen(string);
569 put_be32(s->pb, tag);
570 id3v2_put_size(s, len + 1);
572 put_byte(s->pb, 3); /* UTF-8 */
573 put_buffer(s->pb, string, len);
578 * Write an ID3v2.4 header at beginning of stream
581 static int mp3_write_header(struct AVFormatContext *s)
588 snprintf(tracktxt, sizeof(tracktxt), "%d", s->track);
590 snprintf( yeartxt, sizeof(yeartxt) , "%d", s->year );
592 if(s->title[0]) totlen += 11 + strlen(s->title);
593 if(s->author[0]) totlen += 11 + strlen(s->author);
594 if(s->album[0]) totlen += 11 + strlen(s->album);
595 if(s->genre[0]) totlen += 11 + strlen(s->genre);
596 if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
597 if(s->track) totlen += 11 + strlen(tracktxt);
598 if(s->year) totlen += 11 + strlen(yeartxt);
599 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
600 totlen += strlen(LIBAVFORMAT_IDENT) + 11;
605 put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
607 put_byte(s->pb, 0); /* flags */
609 id3v2_put_size(s, totlen);
611 if(s->title[0]) id3v2_put_ttag(s, s->title, MKBETAG('T', 'I', 'T', '2'));
612 if(s->author[0]) id3v2_put_ttag(s, s->author, MKBETAG('T', 'P', 'E', '1'));
613 if(s->album[0]) id3v2_put_ttag(s, s->album, MKBETAG('T', 'A', 'L', 'B'));
614 if(s->genre[0]) id3v2_put_ttag(s, s->genre, MKBETAG('T', 'C', 'O', 'N'));
615 if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
616 if(s->track) id3v2_put_ttag(s, tracktxt, MKBETAG('T', 'R', 'C', 'K'));
617 if(s->year) id3v2_put_ttag(s, yeartxt, MKBETAG('T', 'Y', 'E', 'R'));
618 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
619 id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C'));
623 static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
625 put_buffer(s->pb, pkt->data, pkt->size);
626 put_flush_packet(s->pb);
630 static int mp3_write_trailer(struct AVFormatContext *s)
632 uint8_t buf[ID3v1_TAG_SIZE];
634 /* write the id3v1 tag */
635 if (s->title[0] != '\0') {
636 id3v1_create_tag(s, buf);
637 put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
638 put_flush_packet(s->pb);
642 #endif //CONFIG_MUXERS
644 #ifdef CONFIG_MP3_DEMUXER
645 AVInputFormat mp3_demuxer = {
653 .flags= AVFMT_GENERIC_INDEX,
654 .extensions = "mp2,mp3,m2a", /* XXX: use probe */
657 #ifdef CONFIG_MP2_MUXER
658 AVOutputFormat mp2_muxer = {
660 "MPEG audio layer 2",
662 #ifdef CONFIG_LIBMP3LAME
675 #ifdef CONFIG_MP3_MUXER
676 AVOutputFormat mp3_muxer = {
678 "MPEG audio layer 3",