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.
82 lines
2.5 KiB
82 lines
2.5 KiB
9 years ago
|
/*
|
||
|
|
* VC-1 demuxer
|
||
|
|
* Copyright (c) 2015 Carl Eugen Hoyos
|
||
|
|
*
|
||
|
|
* 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 "libavutil/intreadwrite.h"
|
||
|
|
#include "libavcodec/vc1_common.h"
|
||
|
|
|
||
|
|
static int vc1_probe(AVProbeData *p)
|
||
|
|
{
|
||
|
|
int seq = 0, entry = 0, frame = 0, i;
|
||
|
|
|
||
|
|
for (i = 0; i < p->buf_size + 5; i++) {
|
||
|
|
uint32_t code = AV_RB32(p->buf + i);
|
||
|
|
if ((code & 0xffffffe0) == 0x100) {
|
||
|
|
int type = code & 0x11f;
|
||
|
|
i += 4;
|
||
|
|
switch (type) {
|
||
|
|
case VC1_CODE_SEQHDR: {
|
||
|
|
int profile, level, chromaformat;
|
||
|
|
profile = (p->buf[i] & 0xc0) >> 6;
|
||
|
|
if (profile != PROFILE_ADVANCED) {
|
||
|
|
seq = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
level = (p->buf[i] & 0x38) >> 3;
|
||
|
|
if (level >= 5) {
|
||
|
|
seq = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
chromaformat = (p->buf[i] & 0x6) >> 1;
|
||
|
|
if (chromaformat != 1) {
|
||
|
|
seq = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
seq++;
|
||
|
|
i += 6;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case VC1_CODE_ENTRYPOINT:
|
||
|
|
if (!seq)
|
||
|
|
continue;
|
||
|
|
entry++;
|
||
|
|
i += 2;
|
||
|
|
break;
|
||
|
|
case VC1_CODE_FRAME:
|
||
|
|
case VC1_CODE_FIELD:
|
||
|
|
case VC1_CODE_SLICE:
|
||
|
|
if (seq && entry)
|
||
|
|
frame++;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (frame > 1)
|
||
|
|
return AVPROBE_SCORE_EXTENSION / 2 + 1;
|
||
|
|
if (frame == 1)
|
||
|
|
return AVPROBE_SCORE_EXTENSION / 4;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
FF_DEF_RAWVIDEO_DEMUXER2(vc1, "raw VC-1", vc1_probe, "vc1", AV_CODEC_ID_VC1, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
|