mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
8381ab1437
* qatar/master: (29 commits) ARM: disable ff_vector_fmul_vfp on VFPv3 systems ARM: check for VFPv3 swscale: Remove unused variables in x86 code. doc: Drop DJGPP section, Libav now compiles out-of-the-box on FreeDOS. x86: Add appropriate ifdefs around certain AVX functions. cmdutils: use sws_freeContext() instead of av_freep(). swscale: delay allocation of formatConvBuffer(). swscale: fix build with --disable-swscale-alpha. movenc: Deprecate the global RTP hinting flag, use a private AVOption instead movenc: Add an AVClass for setting muxer specific options swscale: fix non-bitexact yuv2yuv[X2]() MMX/MMX2 functions. configure: report yasm/nasm presence properly tcp: make connect() timeout properly rawdec: factor video demuxer definitions into a macro. rtspdec: add initial_pause private option. lavf: deprecate AVFormatParameters.width/height. tty: add video_size private option. rawdec: add video_size private option. x11grab: add video_size private option. x11grab: factorize returning error codes. ... Merged-by: Michael Niedermayer <michaelni@gmx.at>
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
|
|
* RAW H.263 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 "avformat.h"
|
|
#include "rawdec.h"
|
|
|
|
static int h263_probe(AVProbeData *p)
|
|
{
|
|
uint64_t code= -1;
|
|
int i;
|
|
int valid_psc=0;
|
|
int invalid_psc=0;
|
|
int res_change=0;
|
|
int src_fmt, last_src_fmt=-1;
|
|
int last_gn=0;
|
|
|
|
for(i=0; i<p->buf_size; i++){
|
|
code = (code<<8) + p->buf[i];
|
|
if ((code & 0xfffffc0000) == 0x800000) {
|
|
src_fmt= (code>>2)&3;
|
|
if( src_fmt != last_src_fmt
|
|
&& last_src_fmt>0 && last_src_fmt<6
|
|
&& src_fmt<6)
|
|
res_change++;
|
|
|
|
if((code&0x300)==0x200 && src_fmt){
|
|
valid_psc++;
|
|
last_gn=0;
|
|
}else
|
|
invalid_psc++;
|
|
last_src_fmt= src_fmt;
|
|
} else if((code & 0xffff800000) == 0x800000) {
|
|
int gn= (code>>(23-5)) & 0x1F;
|
|
if(gn<last_gn){
|
|
invalid_psc++;
|
|
}else
|
|
last_gn= gn;
|
|
}
|
|
}
|
|
//av_log(NULL, AV_LOG_ERROR, "h263_probe: psc:%d invalid:%d res_change:%d\n", valid_psc, invalid_psc, res_change);
|
|
//h263_probe: psc:3 invalid:0 res_change:0 (1588/recent_ffmpeg_parses_mpg_incorrectly.mpg)
|
|
if(valid_psc > 2*invalid_psc + 2*res_change + 3){
|
|
return 50;
|
|
}else if(valid_psc > 2*invalid_psc)
|
|
return 25;
|
|
return 0;
|
|
}
|
|
|
|
FF_DEF_RAWVIDEO_DEMUXER(h263, "raw H.263", h263_probe, NULL, CODEC_ID_H263)
|