mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
|
|
* RAW Chinese AVS video demuxer
|
|
* Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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 CAVS_SEQ_START_CODE 0x000001b0
|
|
#define CAVS_PIC_I_START_CODE 0x000001b3
|
|
#define CAVS_UNDEF_START_CODE 0x000001b4
|
|
#define CAVS_PIC_PB_START_CODE 0x000001b6
|
|
#define CAVS_VIDEO_EDIT_CODE 0x000001b7
|
|
#define CAVS_PROFILE_JIZHUN 0x20
|
|
|
|
static int cavsvideo_probe(AVProbeData *p)
|
|
{
|
|
uint32_t code= -1;
|
|
int pic=0, seq=0, slice_pos = 0;
|
|
int i;
|
|
|
|
for(i=0; i<p->buf_size; i++){
|
|
code = (code<<8) + p->buf[i];
|
|
if ((code & 0xffffff00) == 0x100) {
|
|
if(code < CAVS_SEQ_START_CODE) {
|
|
/* slices have to be consecutive */
|
|
if(code < slice_pos)
|
|
return 0;
|
|
slice_pos = code;
|
|
} else {
|
|
slice_pos = 0;
|
|
}
|
|
if (code == CAVS_SEQ_START_CODE) {
|
|
seq++;
|
|
/* check for the only currently supported profile */
|
|
if(p->buf[i+1] != CAVS_PROFILE_JIZHUN)
|
|
return 0;
|
|
} else if ((code == CAVS_PIC_I_START_CODE) ||
|
|
(code == CAVS_PIC_PB_START_CODE)) {
|
|
pic++;
|
|
} else if ((code == CAVS_UNDEF_START_CODE) ||
|
|
(code > CAVS_VIDEO_EDIT_CODE)) {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
if(seq && seq*9<=pic*10)
|
|
return AVPROBE_SCORE_MAX/2;
|
|
return 0;
|
|
}
|
|
|
|
FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS video", cavsvideo_probe, NULL, CODEC_ID_CAVS)
|