FFmpeg
dnxhddec.c
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1 /*
2  * RAW DNxHD (SMPTE VC-3) demuxer
3  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@gmail.com>
4  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "rawdec.h"
26 #include "libavcodec/dnxhddata.h"
27 
28 static int dnxhd_probe(const AVProbeData *p)
29 {
30  int w, h, compression_id;
31  if (p->buf_size < 0x2c)
32  return 0;
33  if (ff_dnxhd_parse_header_prefix(p->buf) == 0)
34  return 0;
35  h = AV_RB16(p->buf + 0x18);
36  w = AV_RB16(p->buf + 0x1a);
37  if (!w || !h)
38  return 0;
39  compression_id = AV_RB32(p->buf + 0x28);
40  if ((compression_id < 1235 || compression_id > 1260) &&
41  (compression_id < 1270 || compression_id > 1274))
42  return 0;
43  return AVPROBE_SCORE_MAX;
44 }
45 
46 FF_DEF_RAWVIDEO_DEMUXER(dnxhd, "raw DNxHD (SMPTE VC-3)", dnxhd_probe, NULL, AV_CODEC_ID_DNXHD)
w
uint8_t w
Definition: llviddspenc.c:38
dnxhd_probe
static int dnxhd_probe(const AVProbeData *p)
Definition: dnxhddec.c:28
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
dnxhddata.h
intreadwrite.h
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
FF_DEF_RAWVIDEO_DEMUXER
#define FF_DEF_RAWVIDEO_DEMUXER(shortname, longname, probe, ext, id)
Definition: rawdec.h:68
NULL
#define NULL
Definition: coverity.c:32
rawdec.h
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AV_RB32
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:96
ff_dnxhd_parse_header_prefix
static av_always_inline uint64_t ff_dnxhd_parse_header_prefix(const uint8_t *buf)
Definition: dnxhddata.h:84
avformat.h
h
h
Definition: vp9dsp_template.c:2038
AV_CODEC_ID_DNXHD
@ AV_CODEC_ID_DNXHD
Definition: codec_id.h:149
AV_RB16
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_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:98