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libavformat
mgsts.c
Go to the documentation of this file.
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/*
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* Metar Gear Solid: The Twin Snakes demuxer
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
libavutil/intreadwrite.h
"
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#include "
libavutil/intfloat.h
"
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#include "
avformat.h
"
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#include "
riff.h
"
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static
int
read_probe
(
AVProbeData
*p)
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{
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if
(
AV_RB32
(p->
buf
) != 0x000E ||
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AV_RB32
(p->
buf
+ 4) != 0x0050 ||
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AV_RB32
(p->
buf
+ 12) != 0x0034)
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return
0;
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return
AVPROBE_SCORE_MAX
;
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}
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static
int
read_header
(
AVFormatContext
*
s
)
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{
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AVIOContext
*pb = s->
pb
;
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AVStream
*st;
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AVRational
fps;
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uint32_t chunk_size;
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avio_skip
(pb, 4);
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chunk_size =
avio_rb32
(pb);
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if
(chunk_size != 80)
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return
AVERROR
(EIO);
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avio_skip
(pb, 20);
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st =
avformat_new_stream
(s, 0);
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if
(!st)
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return
AVERROR
(ENOMEM);
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st->
need_parsing
=
AVSTREAM_PARSE_HEADERS
;
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st->
start_time
= 0;
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st->
nb_frames
=
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st->
duration
=
avio_rb32
(pb);
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fps =
av_d2q
(
av_int2float
(
avio_rb32
(pb)), INT_MAX);
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st->
codec
->
width
=
avio_rb32
(pb);
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st->
codec
->
height
=
avio_rb32
(pb);
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avio_skip
(pb, 12);
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_VIDEO
;
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st->
codec
->
codec_tag
=
avio_rb32
(pb);
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st->
codec
->
codec_id
=
ff_codec_get_id
(
ff_codec_bmp_tags
,
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st->
codec
->
codec_tag
);
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avpriv_set_pts_info
(st, 64, fps.
den
, fps.
num
);
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avio_skip
(pb, 20);
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return
0;
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}
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static
int
read_packet
(
AVFormatContext
*
s
,
AVPacket
*
pkt
)
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{
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AVIOContext
*pb = s->
pb
;
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uint32_t chunk_size, payload_size;
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int
ret
;
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if
(
url_feof
(pb))
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return
AVERROR_EOF
;
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avio_skip
(pb, 4);
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chunk_size =
avio_rb32
(pb);
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avio_skip
(pb, 4);
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payload_size =
avio_rb32
(pb);
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if
(chunk_size < payload_size + 16)
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return
AVERROR
(EIO);
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ret =
av_get_packet
(pb, pkt, payload_size);
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if
(ret < 0)
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return
ret
;
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pkt->
pos
-= 16;
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pkt->
duration
= 1;
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avio_skip
(pb, chunk_size - (ret + 16));
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return
ret
;
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}
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AVInputFormat
ff_mgsts_demuxer
= {
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.
name
=
"mgsts"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Metal Gear Solid: The Twin Snakes"
),
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.read_probe =
read_probe
,
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.read_header =
read_header
,
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.read_packet =
read_packet
,
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.flags =
AVFMT_GENERIC_INDEX
,
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};
Generated on Sun Mar 23 2014 23:50:11 for FFmpeg by
1.8.2