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ingenientdec.c
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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 
25 // http://www.artificis.hu/files/texts/ingenient.txt
27 {
28  int ret, size, w, h, unk1, unk2;
29 
30  if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G'))
31  return AVERROR(EIO); // FIXME
32 
33  size = avio_rl32(s->pb);
34 
35  w = avio_rl16(s->pb);
36  h = avio_rl16(s->pb);
37 
38  avio_skip(s->pb, 8); // zero + size (padded?)
39  avio_skip(s->pb, 2);
40  unk1 = avio_rl16(s->pb);
41  unk2 = avio_rl16(s->pb);
42  avio_skip(s->pb, 22); // ASCII timestamp
43 
44  av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",
45  size, w, h, unk1, unk2);
46 
47  ret = av_get_packet(s->pb, pkt, size);
48  if (ret < 0)
49  return ret;
50  pkt->stream_index = 0;
51  return ret;
52 }
53 
55 
57  .name = "ingenient",
58  .long_name = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),
59  .priv_data_size = sizeof(FFRawVideoDemuxerContext),
63  .extensions = "cgi", // FIXME
64  .raw_codec_id = AV_CODEC_ID_MJPEG,
65  .priv_class = &ingenient_demuxer_class,
66 };
#define FF_RAWVIDEO_DEMUXER_CLASS(name)
Definition: rawdec.h:46
const char * s
Definition: avisynth_c.h:631
static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ingenientdec.c:26
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:276
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1272
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:241
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:658
#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:175
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
ret
Definition: avfilter.c:974
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
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:1314
AVInputFormat ff_ingenient_demuxer
Definition: ingenientdec.c:56
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:473
static int flags
Definition: cpu.c:47
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:642
Main libavformat public API header.
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
int stream_index
Definition: avcodec.h:1164
#define MKTAG(a, b, c, d)
Definition: common.h:315
int ff_raw_video_read_header(AVFormatContext *s)
Definition: rawdec.c:70
This structure stores compressed data.
Definition: avcodec.h:1139