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/libavformat/diracdec.c

http://github.com/FFmpeg/FFmpeg
C | 43 lines | 18 code | 5 blank | 20 comment | 6 complexity | 46a08b458f063d686c48243c1fe68fb2 MD5 | raw file
 1/*
 2 * RAW Dirac demuxer
 3 * Copyright (c) 2007 Marco Gerards <marco@gnu.org>
 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 "libavutil/intreadwrite.h"
23#include "avformat.h"
24#include "rawdec.h"
25
26static int dirac_probe(const AVProbeData *p)
27{
28    unsigned size;
29    if (AV_RL32(p->buf) != MKTAG('B', 'B', 'C', 'D'))
30        return 0;
31
32    size = AV_RB32(p->buf+5);
33    if (size < 13)
34        return 0;
35    if (size + 13LL > p->buf_size)
36        return AVPROBE_SCORE_MAX / 4;
37    if (AV_RL32(p->buf + size) != MKTAG('B', 'B', 'C', 'D'))
38        return 0;
39
40    return AVPROBE_SCORE_MAX;
41}
42
43FF_DEF_RAWVIDEO_DEMUXER(dirac, "raw Dirac", dirac_probe, NULL, AV_CODEC_ID_DIRAC)