mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.2 KiB
67 lines
2.2 KiB
/* |
|
* 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" |
|
#include "rawdec.h" |
|
|
|
#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; |
|
} |
|
|
|
AVInputFormat mpegvideo_demuxer = { |
|
"mpegvideo", |
|
NULL_IF_CONFIG_SMALL("raw MPEG video"), |
|
0, |
|
mpegvideo_probe, |
|
ff_raw_video_read_header, |
|
ff_raw_read_partial_packet, |
|
.flags= AVFMT_GENERIC_INDEX, |
|
.value = CODEC_ID_MPEG1VIDEO, |
|
};
|
|
|