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/*
* RAW MPEG video demuxer
* Copyright (c) 2002-2003 Fabrice Bellard
* Copyright (c) 2006 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" |
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#define SEQ_START_CODE 0x000001b3
#define GOP_START_CODE 0x000001b8
#define PICTURE_START_CODE 0x00000100
#define SLICE_START_CODE 0x00000101
#define PACK_START_CODE 0x000001ba
#define VIDEO_ID 0x000001e0
#define AUDIO_ID 0x000001c0
static int mpegvideo_probe(AVProbeData *p)
{
uint32_t code= -1;
int pic=0, seq=0, slice=0, pspack=0, pes=0;
int i;
for(i=0; i<p->buf_size; i++){
code = (code<<8) + p->buf[i];
if ((code & 0xffffff00) == 0x100) {
switch(code){
case SEQ_START_CODE: seq++; break;
case PICTURE_START_CODE: pic++; break;
case SLICE_START_CODE: slice++; break;
case PACK_START_CODE: pspack++; break;
}
if ((code & 0x1f0) == VIDEO_ID) pes++;
else if((code & 0x1e0) == AUDIO_ID) pes++;
}
}
if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)
return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
return 0;
}
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