2005-12-17 19:14:38 +01:00
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/*
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2011-01-21 14:53:46 +01:00
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* MP3 demuxer
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2009-01-19 16:46:40 +01:00
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* Copyright (c) 2003 Fabrice Bellard
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2003-09-09 00:34:28 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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2003-09-09 00:34:28 +02:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2003-09-09 00:34:28 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* FFmpeg is distributed in the hope that it will be useful,
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2003-09-09 00:34:28 +02:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 17:30:46 +02:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-12 23:43:26 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2003-09-09 00:34:28 +02:00
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*/
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2008-05-09 13:56:36 +02:00
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2013-07-06 05:34:36 +02:00
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#include "libavutil/opt.h"
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2008-05-09 13:56:36 +02:00
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#include "libavutil/avstring.h"
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2009-10-20 00:36:57 +02:00
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#include "libavutil/intreadwrite.h"
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2014-04-13 14:23:57 +02:00
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#include "libavutil/crc.h"
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2011-05-22 12:46:29 +02:00
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#include "libavutil/dict.h"
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2011-06-04 13:58:23 +02:00
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#include "libavutil/mathematics.h"
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2003-09-09 00:34:28 +02:00
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#include "avformat.h"
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2011-11-29 19:28:15 +01:00
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#include "internal.h"
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2014-04-13 14:23:57 +02:00
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#include "avio_internal.h"
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2009-01-15 13:23:03 +01:00
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#include "id3v2.h"
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2009-06-11 17:26:57 +02:00
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#include "id3v1.h"
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2014-02-19 21:02:12 +01:00
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#include "replaygain.h"
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2009-09-22 14:39:19 +02:00
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#include "libavcodec/mpegaudiodecheader.h"
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2012-09-02 00:30:41 +02:00
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#define XING_FLAG_FRAMES 0x01
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#define XING_FLAG_SIZE 0x02
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2012-09-02 15:36:18 +02:00
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#define XING_FLAG_TOC 0x04
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2014-10-18 16:25:16 +02:00
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#define XING_FLAC_QSCALE 0x08
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2012-09-02 15:36:18 +02:00
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#define XING_TOC_COUNT 100
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2012-09-02 00:30:41 +02:00
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2012-05-08 03:47:58 +02:00
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typedef struct {
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2013-07-06 05:34:36 +02:00
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AVClass *class;
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2012-05-08 03:47:58 +02:00
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int64_t filesize;
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2012-09-20 22:00:52 +02:00
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int xing_toc;
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2012-07-04 22:01:46 +02:00
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int start_pad;
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int end_pad;
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2013-07-06 05:34:36 +02:00
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int usetoc;
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2014-04-12 18:25:41 +02:00
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unsigned frames; /* Total number of frames in file */
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2014-04-17 22:07:45 +02:00
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unsigned header_filesize; /* Total number of bytes in the stream */
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2013-07-07 13:15:32 +02:00
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int is_cbr;
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2012-09-20 22:00:52 +02:00
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} MP3DecContext;
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2012-05-08 03:47:58 +02:00
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2003-09-09 00:34:28 +02:00
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/* mp3 read */
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2006-06-06 00:41:14 +02:00
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static int mp3_read_probe(AVProbeData *p)
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{
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2007-07-08 15:42:46 +02:00
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int max_frames, first_frames = 0;
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2014-12-14 20:08:13 +01:00
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int fsize, frames;
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2006-09-10 22:31:58 +02:00
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uint32_t header;
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2012-12-25 01:51:32 +01:00
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const uint8_t *buf, *buf0, *buf2, *end;
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2015-02-26 19:59:44 +01:00
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AVCodecContext *avctx = avcodec_alloc_context3(NULL);
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2006-06-06 00:41:14 +02:00
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2015-02-26 20:11:19 +01:00
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if (!avctx)
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return 0;
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2009-01-19 22:54:06 +01:00
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buf0 = p->buf;
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2010-02-28 17:40:17 +01:00
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end = p->buf + p->buf_size - sizeof(uint32_t);
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while(buf0 < end && !*buf0)
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buf0++;
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2006-06-06 00:41:14 +02:00
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2006-09-10 22:31:58 +02:00
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max_frames = 0;
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2009-01-19 22:54:06 +01:00
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buf = buf0;
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2006-06-06 00:41:14 +02:00
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2007-12-03 09:27:04 +01:00
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for(; buf < end; buf= buf2+1) {
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2006-09-10 22:31:58 +02:00
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buf2 = buf;
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2013-11-09 01:45:24 +01:00
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if(ff_mpa_check_header(AV_RB32(buf2)))
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continue;
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2006-06-06 00:41:14 +02:00
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2006-09-12 16:16:48 +02:00
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for(frames = 0; buf2 < end; frames++) {
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2014-12-14 20:08:13 +01:00
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int dummy;
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2007-07-06 11:32:34 +02:00
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header = AV_RB32(buf2);
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2015-02-26 19:59:44 +01:00
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fsize = avpriv_mpa_decode_header(avctx, header, &dummy, &dummy, &dummy, &dummy);
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2006-09-10 22:31:58 +02:00
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if(fsize < 0)
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break;
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buf2 += fsize;
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}
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max_frames = FFMAX(max_frames, frames);
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2009-01-19 22:54:06 +01:00
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if(buf == buf0)
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2006-09-20 23:23:32 +02:00
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first_frames= frames;
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2006-09-10 22:31:58 +02:00
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}
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2015-02-26 19:59:44 +01:00
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avcodec_free_context(&avctx);
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2009-09-29 12:23:47 +02:00
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// keep this in sync with ac3 probe, both need to avoid
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// issues with MPEG-files!
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2013-05-05 12:29:56 +02:00
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if (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;
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else if(max_frames>200)return AVPROBE_SCORE_EXTENSION;
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2014-05-12 21:02:06 +02:00
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else if(max_frames>=4 && max_frames >= p->buf_size/10000) return AVPROBE_SCORE_EXTENSION / 2;
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2012-03-19 20:41:34 +01:00
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else if(ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC) && 2*ff_id3v2_tag_len(buf0) >= p->buf_size)
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2013-08-26 00:57:35 +02:00
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return p->buf_size < PROBE_BUF_MAX ? AVPROBE_SCORE_EXTENSION / 4 : AVPROBE_SCORE_EXTENSION - 2;
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2014-05-12 21:02:06 +02:00
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else if(max_frames>=1 && max_frames >= p->buf_size/10000) return 1;
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2006-09-10 22:31:58 +02:00
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else return 0;
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2009-04-22 04:58:20 +02:00
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//mpegps_mp3_unrecognized_format.mpg has max_frames=3
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2006-06-06 00:41:14 +02:00
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}
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2012-09-02 15:36:18 +02:00
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static void read_xing_toc(AVFormatContext *s, int64_t filesize, int64_t duration)
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{
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int i;
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2012-09-20 22:00:52 +02:00
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MP3DecContext *mp3 = s->priv_data;
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2013-07-07 12:50:41 +02:00
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int fill_index = mp3->usetoc && duration > 0;
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2012-09-02 15:36:18 +02:00
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if (!filesize &&
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!(filesize = avio_size(s->pb))) {
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av_log(s, AV_LOG_WARNING, "Cannot determine file size, skipping TOC table.\n");
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2013-07-07 12:50:41 +02:00
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fill_index = 0;
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2012-09-02 15:36:18 +02:00
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}
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for (i = 0; i < XING_TOC_COUNT; i++) {
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uint8_t b = avio_r8(s->pb);
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2013-07-07 12:50:41 +02:00
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if (fill_index)
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2013-07-07 12:37:07 +02:00
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av_add_index_entry(s->streams[0],
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2012-09-02 15:36:18 +02:00
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av_rescale(b, filesize, 256),
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av_rescale(i, duration, XING_TOC_COUNT),
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0, 0, AVINDEX_KEYFRAME);
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}
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2013-07-07 12:50:41 +02:00
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if (fill_index)
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mp3->xing_toc = 1;
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2012-09-02 15:36:18 +02:00
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}
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2014-04-12 18:25:41 +02:00
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static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st,
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MPADecodeHeader *c, uint32_t spf)
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2007-10-23 15:35:20 +02:00
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{
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2014-04-13 14:23:57 +02:00
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#define LAST_BITS(k, n) ((k) & ((1 << (n)) - 1))
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#define MIDDLE_BITS(k, m, n) LAST_BITS((k) >> (m), ((n) - (m)))
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uint16_t crc;
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2014-04-12 18:25:41 +02:00
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uint32_t v;
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2014-04-13 14:23:57 +02:00
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char version[10];
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uint32_t peak = 0;
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int32_t r_gain = INT32_MIN, a_gain = INT32_MIN;
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2013-04-19 21:30:39 +02:00
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MP3DecContext *mp3 = s->priv_data;
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2013-08-05 02:52:41 +02:00
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static const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
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2014-07-24 15:34:36 +02:00
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uint64_t fsize = avio_size(s->pb);
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2012-09-02 15:36:18 +02:00
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2007-10-23 19:10:41 +02:00
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/* Check for Xing / Info tag */
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2014-04-12 18:25:41 +02:00
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avio_skip(s->pb, xing_offtbl[c->lsf == 1][c->nb_channels == 1]);
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2011-02-21 16:43:01 +01:00
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v = avio_rb32(s->pb);
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2014-04-12 18:25:41 +02:00
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mp3->is_cbr = v == MKBETAG('I', 'n', 'f', 'o');
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2014-04-13 14:23:57 +02:00
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if (v != MKBETAG('X', 'i', 'n', 'g') && !mp3->is_cbr)
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return;
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v = avio_rb32(s->pb);
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if (v & XING_FLAG_FRAMES)
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mp3->frames = avio_rb32(s->pb);
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if (v & XING_FLAG_SIZE)
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2014-04-17 23:51:45 +02:00
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mp3->header_filesize = avio_rb32(s->pb);
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2014-07-24 15:34:36 +02:00
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if (fsize && mp3->header_filesize) {
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uint64_t min, delta;
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min = FFMIN(fsize, mp3->header_filesize);
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delta = FFMAX(fsize, mp3->header_filesize) - min;
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if (fsize > mp3->header_filesize && delta > min >> 4) {
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mp3->frames = 0;
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} else if (delta > min >> 4) {
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av_log(s, AV_LOG_WARNING,
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"filesize and duration do not match (growing file?)\n");
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}
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}
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2014-04-17 23:51:45 +02:00
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if (v & XING_FLAG_TOC)
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read_xing_toc(s, mp3->header_filesize, av_rescale_q(mp3->frames,
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2014-04-12 18:25:41 +02:00
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(AVRational){spf, c->sample_rate},
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st->time_base));
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2014-04-13 14:23:57 +02:00
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/* VBR quality */
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2014-10-18 16:25:16 +02:00
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if (v & XING_FLAC_QSCALE)
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avio_rb32(s->pb);
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2012-07-04 22:01:46 +02:00
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2014-04-13 14:23:57 +02:00
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/* Encoder short version string */
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memset(version, 0, sizeof(version));
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avio_read(s->pb, version, 9);
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/* Info Tag revision + VBR method */
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avio_r8(s->pb);
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/* Lowpass filter value */
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avio_r8(s->pb);
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/* ReplayGain peak */
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v = avio_rb32(s->pb);
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peak = av_rescale(v, 100000, 1 << 23);
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/* Radio ReplayGain */
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v = avio_rb16(s->pb);
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if (MIDDLE_BITS(v, 13, 15) == 1) {
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r_gain = MIDDLE_BITS(v, 0, 8) * 10000;
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if (v & (1 << 9))
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r_gain *= -1;
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}
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/* Audiophile ReplayGain */
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v = avio_rb16(s->pb);
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if (MIDDLE_BITS(v, 13, 15) == 2) {
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a_gain = MIDDLE_BITS(v, 0, 8) * 10000;
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if (v & (1 << 9))
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a_gain *= -1;
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}
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/* Encoding flags + ATH Type */
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avio_r8(s->pb);
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/* if ABR {specified bitrate} else {minimal bitrate} */
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avio_r8(s->pb);
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/* Encoder delays */
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2014-04-17 23:51:45 +02:00
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v= avio_rb24(s->pb);
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if(AV_RB32(version) == MKBETAG('L', 'A', 'M', 'E')
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2014-10-24 18:06:26 +02:00
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|| AV_RB32(version) == MKBETAG('L', 'a', 'v', 'f')
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|| AV_RB32(version) == MKBETAG('L', 'a', 'v', 'c')
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) {
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2014-04-17 23:51:45 +02:00
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mp3->start_pad = v>>12;
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mp3-> end_pad = v&4095;
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st->skip_samples = mp3->start_pad + 528 + 1;
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2014-09-21 12:51:41 +02:00
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if (mp3->frames) {
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st->first_discard_sample = -mp3->end_pad + 528 + 1 + mp3->frames * (int64_t)spf;
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st->last_discard_sample = mp3->frames * (int64_t)spf;
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}
|
2014-04-17 23:51:45 +02:00
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if (!st->start_time)
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st->start_time = av_rescale_q(st->skip_samples,
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(AVRational){1, c->sample_rate},
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st->time_base);
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av_log(s, AV_LOG_DEBUG, "pad %d %d\n", mp3->start_pad, mp3-> end_pad);
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}
|
2014-04-13 14:23:57 +02:00
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/* Misc */
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avio_r8(s->pb);
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/* MP3 gain */
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avio_r8(s->pb);
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/* Preset and surround info */
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avio_rb16(s->pb);
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/* Music length */
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avio_rb32(s->pb);
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/* Music CRC */
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avio_rb16(s->pb);
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/* Info Tag CRC */
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crc = ffio_get_checksum(s->pb);
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v = avio_rb16(s->pb);
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if (v == crc) {
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ff_replaygain_export_raw(st, r_gain, peak, a_gain, 0);
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av_dict_set(&st->metadata, "encoder", version, 0);
|
2007-10-23 15:35:20 +02:00
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|
}
|
2014-04-12 18:25:41 +02:00
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}
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|
static void mp3_parse_vbri_tag(AVFormatContext *s, AVStream *st, int64_t base)
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|
{
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|
uint32_t v;
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|
|
|
MP3DecContext *mp3 = s->priv_data;
|
2007-10-23 19:10:41 +02:00
|
|
|
|
2007-10-24 06:56:22 +02:00
|
|
|
/* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
|
2011-02-28 14:57:54 +01:00
|
|
|
avio_seek(s->pb, base + 4 + 32, SEEK_SET);
|
2011-02-21 16:43:01 +01:00
|
|
|
v = avio_rb32(s->pb);
|
2014-04-12 18:25:41 +02:00
|
|
|
if (v == MKBETAG('V', 'B', 'R', 'I')) {
|
2007-10-24 06:56:22 +02:00
|
|
|
/* Check tag version */
|
2014-04-12 18:25:41 +02:00
|
|
|
if (avio_rb16(s->pb) == 1) {
|
2010-07-27 12:08:34 +02:00
|
|
|
/* skip delay and quality */
|
2011-03-15 09:14:38 +01:00
|
|
|
avio_skip(s->pb, 4);
|
2014-04-17 22:07:45 +02:00
|
|
|
mp3->header_filesize = avio_rb32(s->pb);
|
2014-04-12 18:25:41 +02:00
|
|
|
mp3->frames = avio_rb32(s->pb);
|
2007-10-24 06:56:22 +02:00
|
|
|
}
|
|
|
|
}
|
2014-04-12 18:25:41 +02:00
|
|
|
}
|
2007-10-24 06:56:22 +02:00
|
|
|
|
2007-10-23 15:35:20 +02:00
|
|
|
/**
|
2007-10-24 06:56:22 +02:00
|
|
|
* Try to find Xing/Info/VBRI tags and compute duration from info therein
|
2007-10-23 15:35:20 +02:00
|
|
|
*/
|
2009-01-04 17:23:18 +01:00
|
|
|
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
|
2007-10-23 15:35:20 +02:00
|
|
|
{
|
2007-10-23 19:10:41 +02:00
|
|
|
uint32_t v, spf;
|
2009-01-23 13:09:32 +01:00
|
|
|
MPADecodeHeader c;
|
2009-01-04 17:23:18 +01:00
|
|
|
int vbrtag_size = 0;
|
2014-04-12 18:25:41 +02:00
|
|
|
MP3DecContext *mp3 = s->priv_data;
|
2007-10-23 15:35:20 +02:00
|
|
|
|
2014-04-13 14:23:57 +02:00
|
|
|
ffio_init_checksum(s->pb, ff_crcA001_update, 0);
|
|
|
|
|
2011-02-21 16:43:01 +01:00
|
|
|
v = avio_rb32(s->pb);
|
2007-11-04 20:52:08 +01:00
|
|
|
if(ff_mpa_check_header(v) < 0)
|
2009-01-04 17:23:18 +01:00
|
|
|
return -1;
|
2007-11-04 20:52:08 +01:00
|
|
|
|
2011-10-17 09:28:53 +02:00
|
|
|
if (avpriv_mpegaudio_decode_header(&c, v) == 0)
|
2009-01-04 17:23:18 +01:00
|
|
|
vbrtag_size = c.frame_size;
|
2007-10-23 19:10:41 +02:00
|
|
|
if(c.layer != 3)
|
2009-01-04 17:23:18 +01:00
|
|
|
return -1;
|
2007-10-23 15:35:20 +02:00
|
|
|
|
2012-09-02 15:36:18 +02:00
|
|
|
spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
|
|
|
|
|
2014-04-12 18:25:41 +02:00
|
|
|
mp3->frames = 0;
|
2014-04-17 22:07:45 +02:00
|
|
|
mp3->header_filesize = 0;
|
2007-10-23 19:10:41 +02:00
|
|
|
|
2014-04-12 18:25:41 +02:00
|
|
|
mp3_parse_info_tag(s, st, &c, spf);
|
|
|
|
mp3_parse_vbri_tag(s, st, base);
|
2007-10-24 06:56:22 +02:00
|
|
|
|
2014-04-17 22:07:45 +02:00
|
|
|
if (!mp3->frames && !mp3->header_filesize)
|
2009-01-04 17:23:18 +01:00
|
|
|
return -1;
|
|
|
|
|
|
|
|
/* Skip the vbr tag frame */
|
2011-02-28 14:57:54 +01:00
|
|
|
avio_seek(s->pb, base + vbrtag_size, SEEK_SET);
|
2007-10-23 19:10:41 +02:00
|
|
|
|
2014-04-12 18:25:41 +02:00
|
|
|
if (mp3->frames)
|
|
|
|
st->duration = av_rescale_q(mp3->frames, (AVRational){spf, c.sample_rate},
|
2010-07-27 12:08:34 +02:00
|
|
|
st->time_base);
|
2014-04-17 22:07:45 +02:00
|
|
|
if (mp3->header_filesize && mp3->frames && !mp3->is_cbr)
|
|
|
|
st->codec->bit_rate = av_rescale(mp3->header_filesize, 8 * c.sample_rate, mp3->frames * (int64_t)spf);
|
2013-07-07 13:15:32 +02:00
|
|
|
|
2009-01-04 17:23:18 +01:00
|
|
|
return 0;
|
2007-10-23 15:35:20 +02:00
|
|
|
}
|
|
|
|
|
2012-01-12 13:20:36 +01:00
|
|
|
static int mp3_read_header(AVFormatContext *s)
|
2003-09-09 00:34:28 +02:00
|
|
|
{
|
2013-04-19 21:30:39 +02:00
|
|
|
MP3DecContext *mp3 = s->priv_data;
|
2003-09-09 00:34:28 +02:00
|
|
|
AVStream *st;
|
2008-10-03 12:16:29 +02:00
|
|
|
int64_t off;
|
2014-02-19 21:02:12 +01:00
|
|
|
int ret;
|
2003-09-09 00:34:28 +02:00
|
|
|
|
2011-06-18 11:43:24 +02:00
|
|
|
st = avformat_new_stream(s, NULL);
|
2003-09-09 00:34:28 +02:00
|
|
|
if (!st)
|
2007-07-19 17:21:30 +02:00
|
|
|
return AVERROR(ENOMEM);
|
2003-09-09 00:34:28 +02:00
|
|
|
|
2010-03-31 01:30:55 +02:00
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
2012-08-05 11:11:04 +02:00
|
|
|
st->codec->codec_id = AV_CODEC_ID_MP3;
|
2012-07-24 17:40:25 +02:00
|
|
|
st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
|
2007-10-18 17:02:34 +02:00
|
|
|
st->start_time = 0;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2009-11-22 22:04:18 +01:00
|
|
|
// lcm of all mp3 sample rates
|
2011-11-29 19:28:15 +01:00
|
|
|
avpriv_set_pts_info(st, 64, 1, 14112000);
|
2009-11-22 22:04:18 +01:00
|
|
|
|
2012-01-21 22:53:57 +01:00
|
|
|
s->pb->maxsize = -1;
|
2011-03-03 20:11:45 +01:00
|
|
|
off = avio_tell(s->pb);
|
2010-02-10 13:44:16 +01:00
|
|
|
|
2011-05-22 12:46:29 +02:00
|
|
|
if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
|
2009-10-05 23:36:56 +02:00
|
|
|
ff_id3v1_read(s);
|
2003-09-09 00:34:28 +02:00
|
|
|
|
2012-05-08 03:47:58 +02:00
|
|
|
if(s->pb->seekable)
|
|
|
|
mp3->filesize = avio_size(s->pb);
|
|
|
|
|
2009-01-04 17:23:18 +01:00
|
|
|
if (mp3_parse_vbr_tags(s, st, off) < 0)
|
2011-02-28 14:57:54 +01:00
|
|
|
avio_seek(s->pb, off, SEEK_SET);
|
2007-10-23 15:35:20 +02:00
|
|
|
|
2014-02-19 21:02:12 +01:00
|
|
|
ret = ff_replaygain_export(st, s->metadata);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
2003-09-09 00:34:28 +02:00
|
|
|
/* the parameters will be extracted from the compressed bitstream */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define MP3_PACKET_SIZE 1024
|
|
|
|
|
|
|
|
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
|
|
{
|
2013-04-19 21:30:39 +02:00
|
|
|
MP3DecContext *mp3 = s->priv_data;
|
2003-09-09 00:34:28 +02:00
|
|
|
int ret, size;
|
2012-05-08 03:47:58 +02:00
|
|
|
int64_t pos;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2003-09-09 00:34:28 +02:00
|
|
|
size= MP3_PACKET_SIZE;
|
2012-05-08 03:47:58 +02:00
|
|
|
pos = avio_tell(s->pb);
|
|
|
|
if(mp3->filesize > ID3v1_TAG_SIZE && pos < mp3->filesize)
|
|
|
|
size= FFMIN(size, mp3->filesize - pos);
|
2003-09-09 00:34:28 +02:00
|
|
|
|
2007-11-21 08:41:00 +01:00
|
|
|
ret= av_get_packet(s->pb, pkt, size);
|
2003-09-09 00:34:28 +02:00
|
|
|
if (ret <= 0) {
|
2011-09-21 00:51:53 +02:00
|
|
|
if(ret<0)
|
|
|
|
return ret;
|
|
|
|
return AVERROR_EOF;
|
2003-09-09 00:34:28 +02:00
|
|
|
}
|
2011-01-21 23:55:31 +01:00
|
|
|
|
2012-07-29 01:56:31 +02:00
|
|
|
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
|
2003-09-09 00:34:28 +02:00
|
|
|
pkt->stream_index = 0;
|
2011-01-21 23:55:31 +01:00
|
|
|
|
2012-05-08 03:45:17 +02:00
|
|
|
if (ret >= ID3v1_TAG_SIZE &&
|
2011-01-21 23:55:31 +01:00
|
|
|
memcmp(&pkt->data[ret - ID3v1_TAG_SIZE], "TAG", 3) == 0)
|
|
|
|
ret -= ID3v1_TAG_SIZE;
|
|
|
|
|
2003-09-09 00:34:28 +02:00
|
|
|
/* note: we need to modify the packet size here to handle the last
|
|
|
|
packet */
|
|
|
|
pkt->size = ret;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-10-21 02:42:16 +02:00
|
|
|
static int check(AVFormatContext *s, int64_t pos)
|
|
|
|
{
|
|
|
|
int64_t ret = avio_seek(s->pb, pos, SEEK_SET);
|
|
|
|
unsigned header;
|
|
|
|
MPADecodeHeader sd;
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
header = avio_rb32(s->pb);
|
|
|
|
if (ff_mpa_check_header(header) < 0)
|
|
|
|
return -1;
|
|
|
|
if (avpriv_mpegaudio_decode_header(&sd, header) == 1)
|
|
|
|
return -1;
|
|
|
|
return sd.frame_size;
|
|
|
|
}
|
|
|
|
|
2012-09-02 15:36:18 +02:00
|
|
|
static int mp3_seek(AVFormatContext *s, int stream_index, int64_t timestamp,
|
|
|
|
int flags)
|
2012-07-04 22:01:46 +02:00
|
|
|
{
|
2012-09-20 22:00:52 +02:00
|
|
|
MP3DecContext *mp3 = s->priv_data;
|
2013-07-07 13:15:32 +02:00
|
|
|
AVIndexEntry *ie, ie1;
|
2012-09-02 15:36:18 +02:00
|
|
|
AVStream *st = s->streams[0];
|
|
|
|
int64_t ret = av_index_search_timestamp(st, timestamp, flags);
|
2012-10-21 02:42:16 +02:00
|
|
|
int i, j;
|
2013-10-25 19:35:55 +02:00
|
|
|
int dir = (flags&AVSEEK_FLAG_BACKWARD) ? -1 : 1;
|
2014-09-07 21:44:19 +02:00
|
|
|
int64_t best_pos;
|
|
|
|
int best_score;
|
2012-09-02 15:36:18 +02:00
|
|
|
|
2014-07-24 15:34:36 +02:00
|
|
|
if ( mp3->is_cbr
|
|
|
|
&& st->duration > 0
|
2015-02-11 02:13:46 +01:00
|
|
|
&& mp3->header_filesize > s->internal->data_offset
|
2014-07-24 15:34:36 +02:00
|
|
|
&& mp3->frames) {
|
2013-07-07 13:15:32 +02:00
|
|
|
int64_t filesize = avio_size(s->pb);
|
|
|
|
int64_t duration;
|
2015-02-11 02:13:46 +01:00
|
|
|
if (filesize <= s->internal->data_offset)
|
2013-07-07 13:15:32 +02:00
|
|
|
filesize = mp3->header_filesize;
|
2015-02-11 02:13:46 +01:00
|
|
|
filesize -= s->internal->data_offset;
|
|
|
|
duration = av_rescale(st->duration, filesize, mp3->header_filesize - s->internal->data_offset);
|
2013-07-07 13:15:32 +02:00
|
|
|
ie = &ie1;
|
|
|
|
timestamp = av_clip64(timestamp, 0, duration);
|
|
|
|
ie->timestamp = timestamp;
|
2015-02-11 02:13:46 +01:00
|
|
|
ie->pos = av_rescale(timestamp, filesize, duration) + s->internal->data_offset;
|
2013-07-07 13:15:32 +02:00
|
|
|
} else if (mp3->xing_toc) {
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ie = &st->index_entries[ret];
|
|
|
|
} else {
|
2012-09-20 22:00:52 +02:00
|
|
|
st->skip_samples = timestamp <= 0 ? mp3->start_pad + 528 + 1 : 0;
|
|
|
|
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2014-09-07 21:44:19 +02:00
|
|
|
avio_seek(s->pb, FFMAX(ie->pos - 4096, 0), SEEK_SET);
|
2012-09-02 15:36:18 +02:00
|
|
|
ret = avio_seek(s->pb, ie->pos, SEEK_SET);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
2012-07-04 22:01:46 +02:00
|
|
|
|
2012-10-21 02:42:16 +02:00
|
|
|
#define MIN_VALID 3
|
2014-09-07 21:44:19 +02:00
|
|
|
best_pos = ie->pos;
|
|
|
|
best_score = 999;
|
2012-10-21 02:42:16 +02:00
|
|
|
for(i=0; i<4096; i++) {
|
2014-09-07 21:44:19 +02:00
|
|
|
int64_t pos = ie->pos + (dir > 0 ? i - 1024 : -i);
|
|
|
|
int64_t candidate = -1;
|
|
|
|
int score = 999;
|
2014-11-18 04:04:37 +01:00
|
|
|
|
|
|
|
if (pos < 0)
|
|
|
|
continue;
|
|
|
|
|
2012-10-21 02:42:16 +02:00
|
|
|
for(j=0; j<MIN_VALID; j++) {
|
|
|
|
ret = check(s, pos);
|
|
|
|
if(ret < 0)
|
|
|
|
break;
|
2014-09-07 21:44:19 +02:00
|
|
|
if ((ie->pos - pos)*dir <= 0 && abs(MIN_VALID/2-j) < score) {
|
|
|
|
candidate = pos;
|
|
|
|
score = abs(MIN_VALID/2-j);
|
|
|
|
}
|
2012-10-21 02:42:16 +02:00
|
|
|
pos += ret;
|
2012-09-02 15:36:18 +02:00
|
|
|
}
|
2014-09-07 21:44:19 +02:00
|
|
|
if (best_score > score && j == MIN_VALID) {
|
|
|
|
best_pos = candidate;
|
|
|
|
best_score = score;
|
|
|
|
if(score == 0)
|
|
|
|
break;
|
|
|
|
}
|
2012-09-02 15:36:18 +02:00
|
|
|
}
|
2012-07-04 22:01:46 +02:00
|
|
|
|
2014-09-07 21:44:19 +02:00
|
|
|
ret = avio_seek(s->pb, best_pos, SEEK_SET);
|
2012-10-21 02:42:16 +02:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
ff_update_cur_dts(s, st, ie->timestamp);
|
|
|
|
st->skip_samples = ie->timestamp <= 0 ? mp3->start_pad + 528 + 1 : 0;
|
|
|
|
return 0;
|
2012-07-04 22:01:46 +02:00
|
|
|
}
|
|
|
|
|
2013-07-06 05:34:36 +02:00
|
|
|
static const AVOption options[] = {
|
|
|
|
{ "usetoc", "use table of contents", offsetof(MP3DecContext, usetoc), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
|
|
|
|
{ NULL },
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVClass demuxer_class = {
|
|
|
|
.class_name = "mp3",
|
|
|
|
.item_name = av_default_item_name,
|
|
|
|
.option = options,
|
|
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
|
|
.category = AV_CLASS_CATEGORY_DEMUXER,
|
|
|
|
};
|
|
|
|
|
2011-01-25 23:03:28 +01:00
|
|
|
AVInputFormat ff_mp3_demuxer = {
|
2011-07-16 22:18:12 +02:00
|
|
|
.name = "mp3",
|
2012-07-24 03:23:48 +02:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("MP2/3 (MPEG audio layer 2/3)"),
|
2011-07-16 22:18:12 +02:00
|
|
|
.read_probe = mp3_read_probe,
|
|
|
|
.read_header = mp3_read_header,
|
|
|
|
.read_packet = mp3_read_packet,
|
2012-09-02 15:36:18 +02:00
|
|
|
.read_seek = mp3_seek,
|
2012-09-20 22:00:52 +02:00
|
|
|
.priv_data_size = sizeof(MP3DecContext),
|
2012-04-06 16:50:48 +02:00
|
|
|
.flags = AVFMT_GENERIC_INDEX,
|
2013-09-09 16:30:35 +02:00
|
|
|
.extensions = "mp2,mp3,m2a,mpa", /* XXX: use probe */
|
2013-07-06 05:34:36 +02:00
|
|
|
.priv_class = &demuxer_class,
|
2009-09-22 14:39:19 +02:00
|
|
|
};
|