1 /*
2 * MJPEG 2000 Demuxer
3 * Copyright (c) 2016 Ståle Kristoffersen
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "config_components.h"
23
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26 #include "rawdec.h"
27
28 #if CONFIG_MJPEG_2000_DEMUXER
mjpeg2000_probe(const AVProbeData * p)29 static int mjpeg2000_probe(const AVProbeData *p)
30 {
31 const uint8_t *b = p->buf;
32 int i, marker, marker_size;
33 int frames = 0, invalid = 0;
34
35 for (i = 0; i < p->buf_size - 5; i++) {
36 if (AV_RB32(b) == 0xff4fff51){
37 marker_size = AV_RB16(b+4);
38 if (marker_size + i < p->buf_size - 4) {
39 marker = AV_RB8(b+4+marker_size);
40 if (marker == 0xff)
41 frames++;
42 else
43 invalid++;
44 }
45 }
46 b += 1;
47 }
48 if (invalid*4 + 1 < frames) {
49 if (invalid == 0 && frames > 2)
50 return AVPROBE_SCORE_EXTENSION / 2;
51 return AVPROBE_SCORE_EXTENSION / 4;
52 }
53 return 0;
54 }
55 FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
56 #endif
57