70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
|
/*
|
||
|
|
* RAW Chinese AVS video demuxer
|
||
|
|
* Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de>
|
||
|
|
*
|
||
|
|
* 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"
|
||
|
|
#include "libavcodec/internal.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(const AVProbeData *p)
|
||
|
|
{
|
||
|
|
uint32_t code= -1;
|
||
|
|
int pic=0, seq=0, slice_pos = 0;
|
||
|
|
const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size;
|
||
|
|
|
||
|
|
while (ptr < end) {
|
||
|
|
ptr = avpriv_find_start_code(ptr, end, &code);
|
||
|
|
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 (*ptr != 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_EXTENSION+1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS)
|