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