Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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  if (av_new_packet(pkt, size) < 0)
48  return AVERROR(ENOMEM);
49 
50  pkt->pos = avio_tell(s->pb);
51  pkt->stream_index = 0;
52  ret = avio_read(s->pb, pkt->data, size);
53  if (ret < 0) {
54  av_free_packet(pkt);
55  return ret;
56  }
57  pkt->size = ret;
58  return ret;
59 }
60 
62 
64  .name = "ingenient",
65  .long_name = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),
66  .priv_data_size = sizeof(FFRawVideoDemuxerContext),
70  .extensions = "cgi", // FIXME
71  .raw_codec_id = AV_CODEC_ID_MJPEG,
72  .priv_class = &ingenient_demuxer_class,
73 };
#define FF_RAWVIDEO_DEMUXER_CLASS(name)
Definition: rawdec.h:44
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:243
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:998
int size
Definition: avcodec.h:974
static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ingenientdec.c:26
Format I/O context.
Definition: avformat.h:922
uint8_t * data
Definition: avcodec.h:973
static int flags
Definition: log.c:44
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:452
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:81
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:564
#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:150
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:544
AVIOContext * pb
I/O context.
Definition: avformat.h:964
AVInputFormat ff_ingenient_demuxer
Definition: ingenientdec.c:63
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:417
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:548
Main libavformat public API header.
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
int stream_index
Definition: avcodec.h:975
#define MKTAG(a, b, c, d)
Definition: common.h:238
int ff_raw_video_read_header(AVFormatContext *s)
Definition: rawdec.c:73
This structure stores compressed data.
Definition: avcodec.h:950