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106 lines
2.9 KiB
106 lines
2.9 KiB
/* |
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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->internal->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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const 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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