mirror of
https://github.com/FFmpeg/FFmpeg.git
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107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/*
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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(const 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->codecpar->width = avio_rb32(pb);
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st->codecpar->height = avio_rb32(pb);
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avio_skip(pb, 12);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_tag = avio_rb32(pb);
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st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
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st->codecpar->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 (avio_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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};
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