2 * Metar Gear Solid: The Twin Snakes demuxer
3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/intfloat.h"
27 static int read_probe(AVProbeData
*p
)
29 if (AV_RB32(p
->buf
) != 0x000E ||
30 AV_RB32(p
->buf
+ 4) != 0x0050 ||
31 AV_RB32(p
->buf
+ 12) != 0x0034)
33 return AVPROBE_SCORE_MAX
;
36 static int read_header(AVFormatContext
*s
)
38 AVIOContext
*pb
= s
->pb
;
44 chunk_size
= avio_rb32(pb
);
49 st
= avformat_new_stream(s
, 0);
51 return AVERROR(ENOMEM
);
53 st
->need_parsing
= AVSTREAM_PARSE_HEADERS
;
56 st
->duration
= avio_rb32(pb
);
57 fps
= av_d2q(av_int2float(avio_rb32(pb
)), INT_MAX
);
58 st
->codec
->width
= avio_rb32(pb
);
59 st
->codec
->height
= avio_rb32(pb
);
61 st
->codec
->codec_type
= AVMEDIA_TYPE_VIDEO
;
62 st
->codec
->codec_tag
= avio_rb32(pb
);
63 st
->codec
->codec_id
= ff_codec_get_id(ff_codec_bmp_tags
,
64 st
->codec
->codec_tag
);
65 avpriv_set_pts_info(st
, 64, fps
.den
, fps
.num
);
71 static int read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
73 AVIOContext
*pb
= s
->pb
;
74 uint32_t chunk_size
, payload_size
;
81 chunk_size
= avio_rb32(pb
);
83 payload_size
= avio_rb32(pb
);
85 if (chunk_size
< payload_size
+ 16)
88 ret
= av_get_packet(pb
, pkt
, payload_size
);
94 avio_skip(pb
, chunk_size
- (ret
+ 16));
99 AVInputFormat ff_mgsts_demuxer
= {
101 .long_name
= NULL_IF_CONFIG_SMALL("Metal Gear Solid: The Twin Snakes"),
102 .read_probe
= read_probe
,
103 .read_header
= read_header
,
104 .read_packet
= read_packet
,
105 .flags
= AVFMT_GENERIC_INDEX
,