mirror of https://git.ffmpeg.org/ffmpeg.git
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
|
/*
|
||
|
|
* MJPEG 2000 Demuxer
|
||
|
|
* Copyright (c) 2016 Ståle Kristoffersen
|
||
|
|
*
|
||
|
|
* 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 "libavutil/intreadwrite.h"
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "rawdec.h"
|
||
|
|
|
||
|
|
#if CONFIG_MJPEG_2000_DEMUXER
|
||
|
|
static int mjpeg2000_probe(AVProbeData *p)
|
||
|
|
{
|
||
|
|
const uint8_t *b = p->buf;
|
||
|
|
int i, marker, marker_size;
|
||
|
|
int frames = 0, invalid = 0;
|
||
|
|
|
||
|
|
for (i = 0; i < p->buf_size - 5; i++) {
|
||
|
|
if (AV_RB32(b) == 0xff4fff51){
|
||
|
|
marker_size = AV_RB16(b+4);
|
||
|
|
if (marker_size + i < p->buf_size - 4) {
|
||
|
|
marker = AV_RB8(b+4+marker_size);
|
||
|
|
if (marker == 0xff)
|
||
|
|
frames++;
|
||
|
|
else
|
||
|
|
invalid++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
b += 1;
|
||
|
|
}
|
||
|
|
if (invalid*4 + 1 < frames) {
|
||
|
|
if (invalid == 0 && frames > 2)
|
||
|
|
return AVPROBE_SCORE_EXTENSION / 2;
|
||
|
|
return AVPROBE_SCORE_EXTENSION / 4;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
|
||
|
|
#endif
|