FFmpeg
diracdec.c
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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 
26 static 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 
#define NULL
Definition: coverity.c:32
#define FF_DEF_RAWVIDEO_DEMUXER(shortname, longname, probe, ext, id)
Definition: rawdec.h:86
static int dirac_probe(const AVProbeData *p)
Definition: diracdec.c:26
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
ptrdiff_t size
Definition: opengl_enc.c:100
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
#define MKTAG(a, b, c, d)
Definition: common.h:366
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87