diff options
Diffstat (limited to 'libavformat/mgsts.c')
-rw-r--r-- | libavformat/mgsts.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/libavformat/mgsts.c b/libavformat/mgsts.c new file mode 100644 index 0000000000..dec6bfc8f6 --- /dev/null +++ b/libavformat/mgsts.c @@ -0,0 +1,106 @@ +/* + * 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(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->codec->width = avio_rb32(pb); + st->codec->height = avio_rb32(pb); + avio_skip(pb, 12); + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_tag = avio_rb32(pb); + st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, + st->codec->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 (url_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, +}; |