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  .value = CODEC_ID_MJPEG,
72  .priv_class = &ingenient_demuxer_class,
73 };