mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
7a72695c05
* commit '36ef5369ee9b336febc2c270f8718cec4476cb85': Replace all CODEC_ID_* with AV_CODEC_ID_* lavc: add AV prefix to codec ids. Conflicts: doc/APIchanges doc/examples/decoding_encoding.c doc/examples/muxing.c ffmpeg.c ffprobe.c ffserver.c libavcodec/8svx.c libavcodec/avcodec.h libavcodec/dnxhd_parser.c libavcodec/dvdsubdec.c libavcodec/error_resilience.c libavcodec/h263dec.c libavcodec/libvorbisenc.c libavcodec/mjpeg_parser.c libavcodec/mjpegenc.c libavcodec/mpeg12.c libavcodec/mpeg4videodec.c libavcodec/mpegvideo.c libavcodec/mpegvideo_enc.c libavcodec/pcm.c libavcodec/r210dec.c libavcodec/utils.c libavcodec/v210dec.c libavcodec/version.h libavdevice/alsa-audio-dec.c libavdevice/bktr.c libavdevice/v4l2.c libavformat/asfdec.c libavformat/asfenc.c libavformat/avformat.h libavformat/avidec.c libavformat/caf.c libavformat/electronicarts.c libavformat/flacdec.c libavformat/flvdec.c libavformat/flvenc.c libavformat/framecrcenc.c libavformat/img2.c libavformat/img2dec.c libavformat/img2enc.c libavformat/ipmovie.c libavformat/isom.c libavformat/matroska.c libavformat/matroskadec.c libavformat/matroskaenc.c libavformat/mov.c libavformat/movenc.c libavformat/mp3dec.c libavformat/mpeg.c libavformat/mpegts.c libavformat/mxf.c libavformat/mxfdec.c libavformat/mxfenc.c libavformat/nsvdec.c libavformat/nut.c libavformat/oggenc.c libavformat/pmpdec.c libavformat/rawdec.c libavformat/rawenc.c libavformat/riff.c libavformat/sdp.c libavformat/utils.c libavformat/vocenc.c libavformat/wtv.c libavformat/xmv.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
|
|
* raw ADTS AAC demuxer
|
|
* Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
|
|
* Copyright (c) 2009 Robert Swain ( rob opendot cl )
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "rawdec.h"
|
|
#include "id3v1.h"
|
|
|
|
|
|
static int adts_aac_probe(AVProbeData *p)
|
|
{
|
|
int max_frames = 0, first_frames = 0;
|
|
int fsize, frames;
|
|
uint8_t *buf0 = p->buf;
|
|
uint8_t *buf2;
|
|
uint8_t *buf;
|
|
uint8_t *end = buf0 + p->buf_size - 7;
|
|
|
|
buf = buf0;
|
|
|
|
for(; buf < end; buf= buf2+1) {
|
|
buf2 = buf;
|
|
|
|
for(frames = 0; buf2 < end; frames++) {
|
|
uint32_t header = AV_RB16(buf2);
|
|
if((header&0xFFF6) != 0xFFF0)
|
|
break;
|
|
fsize = (AV_RB32(buf2 + 3) >> 13) & 0x1FFF;
|
|
if(fsize < 7)
|
|
break;
|
|
fsize = FFMIN(fsize, end - buf2);
|
|
buf2 += fsize;
|
|
}
|
|
max_frames = FFMAX(max_frames, frames);
|
|
if(buf == buf0)
|
|
first_frames= frames;
|
|
}
|
|
if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
|
|
else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
|
|
else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
|
|
else if(max_frames>=1) return 1;
|
|
else return 0;
|
|
}
|
|
|
|
static int adts_aac_read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = s->iformat->raw_codec_id;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
|
|
|
|
ff_id3v1_read(s);
|
|
|
|
//LCM of all possible ADTS sample rates
|
|
avpriv_set_pts_info(st, 64, 1, 28224000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_aac_demuxer = {
|
|
.name = "aac",
|
|
.long_name = NULL_IF_CONFIG_SMALL("raw ADTS AAC (Advanced Audio Coding)"),
|
|
.read_probe = adts_aac_probe,
|
|
.read_header = adts_aac_read_header,
|
|
.read_packet = ff_raw_read_partial_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
.extensions = "aac",
|
|
.raw_codec_id = AV_CODEC_ID_AAC,
|
|
};
|