mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-25 20:50:09 +00:00
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>
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/*
|
|
* RAW H.261 video demuxer
|
|
* Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* 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 "libavcodec/get_bits.h"
|
|
#include "avformat.h"
|
|
#include "rawdec.h"
|
|
|
|
static int h261_probe(AVProbeData *p)
|
|
{
|
|
uint32_t code= -1;
|
|
int i;
|
|
int valid_psc=0;
|
|
int invalid_psc=0;
|
|
int next_gn=0;
|
|
int src_fmt=0;
|
|
GetBitContext gb;
|
|
|
|
init_get_bits(&gb, p->buf, p->buf_size*8);
|
|
|
|
for(i=0; i<p->buf_size*8; i++){
|
|
if ((code & 0x01ff0000) || !(code & 0xff00)) {
|
|
code = (code<<8) + get_bits(&gb, 8);
|
|
i += 7;
|
|
} else
|
|
code = (code<<1) + get_bits1(&gb);
|
|
if ((code & 0xffff0000) == 0x10000) {
|
|
int gn= (code>>12)&0xf;
|
|
if(!gn)
|
|
src_fmt= code&8;
|
|
if(gn != next_gn) invalid_psc++;
|
|
else valid_psc++;
|
|
|
|
if(src_fmt){ // CIF
|
|
next_gn= (gn+1 )%13;
|
|
}else{ //QCIF
|
|
next_gn= (gn+1+!!gn)% 7;
|
|
}
|
|
}
|
|
}
|
|
if(valid_psc > 2*invalid_psc + 6){
|
|
return 50;
|
|
}else if(valid_psc > 2*invalid_psc + 2)
|
|
return 25;
|
|
return 0;
|
|
}
|
|
|
|
FF_DEF_RAWVIDEO_DEMUXER(h261, "raw H.261", h261_probe, "h261", AV_CODEC_ID_H261)
|