7a72695c05
* commit '36ef5369ee':
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>
65 lines
2 KiB
C
65 lines
2 KiB
C
/*
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* RAW H.261 video demuxer
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* Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
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*
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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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* 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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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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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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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/get_bits.h"
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#include "avformat.h"
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#include "rawdec.h"
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static int h261_probe(AVProbeData *p)
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{
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uint32_t code= -1;
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int i;
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int valid_psc=0;
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int invalid_psc=0;
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int next_gn=0;
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int src_fmt=0;
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GetBitContext gb;
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init_get_bits(&gb, p->buf, p->buf_size*8);
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for(i=0; i<p->buf_size*8; i++){
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if ((code & 0x01ff0000) || !(code & 0xff00)) {
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code = (code<<8) + get_bits(&gb, 8);
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i += 7;
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} else
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code = (code<<1) + get_bits1(&gb);
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if ((code & 0xffff0000) == 0x10000) {
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int gn= (code>>12)&0xf;
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if(!gn)
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src_fmt= code&8;
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if(gn != next_gn) invalid_psc++;
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else valid_psc++;
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if(src_fmt){ // CIF
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next_gn= (gn+1 )%13;
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}else{ //QCIF
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next_gn= (gn+1+!!gn)% 7;
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}
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}
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}
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if(valid_psc > 2*invalid_psc + 6){
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return 50;
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}else if(valid_psc > 2*invalid_psc + 2)
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return 25;
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return 0;
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}
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FF_DEF_RAWVIDEO_DEMUXER(h261, "raw H.261", h261_probe, "h261", AV_CODEC_ID_H261)
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