FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ingenientdec.c
Go to the documentation of this file.
1 /*
2  * RAW Ingenient MJPEG demuxer
3  * Copyright (c) 2005 Alex Beregszaszi
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 "avformat.h"
23 #include "rawdec.h"
24 #include "libavutil/intreadwrite.h"
25 
26 // http://multimedia.cx/ingenient.txt
28 {
29  if ( AV_RN32(p->buf) != AV_RN32("MJPG")
30  || p->buf_size < 50
31  || AV_RB16(p->buf + 48) != 0xffd8)
32  return 0;
33  return AVPROBE_SCORE_MAX * 3 / 4;
34 }
35 
37 {
38  int ret, size, w, h, unk1, unk2;
39 
40  if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G'))
41  return AVERROR(EIO); // FIXME
42 
43  size = avio_rl32(s->pb);
44 
45  w = avio_rl16(s->pb);
46  h = avio_rl16(s->pb);
47 
48  avio_skip(s->pb, 8); // zero + size (padded?)
49  avio_skip(s->pb, 2);
50  unk1 = avio_rl16(s->pb);
51  unk2 = avio_rl16(s->pb);
52  avio_skip(s->pb, 22); // ASCII timestamp
53 
54  av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",
55  size, w, h, unk1, unk2);
56 
57  ret = av_get_packet(s->pb, pkt, size);
58  if (ret < 0)
59  return ret;
60  pkt->stream_index = 0;
61  return ret;
62 }
63 
65 
67  .name = "ingenient",
68  .long_name = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),
69  .priv_data_size = sizeof(FFRawVideoDemuxerContext),
74  .extensions = "cgi", // FIXME
75  .raw_codec_id = AV_CODEC_ID_MJPEG,
76  .priv_class = &ingenient_demuxer_class,
77 };
#define FF_RAWVIDEO_DEMUXER_CLASS(name)
Definition: rawdec.h:46
const char * s
Definition: avisynth_c.h:768
static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ingenientdec.c:36
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
static AVPacket pkt
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:87
Format I/O context.
Definition: avformat.h:1338
static int flags
Definition: log.c:57
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:289
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:726
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:464
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:514
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1380
AVInputFormat ff_ingenient_demuxer
Definition: ingenientdec.c:66
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:487
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
#define AV_RN32(p)
Definition: intreadwrite.h:364
static int ingenient_probe(AVProbeData *p)
Definition: ingenientdec.c:27
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:710
Main libavformat public API header.
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
int stream_index
Definition: avcodec.h:1609
#define MKTAG(a, b, c, d)
Definition: common.h:342
int ff_raw_video_read_header(AVFormatContext *s)
Definition: rawdec.c:70
This structure stores compressed data.
Definition: avcodec.h:1584