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  1. /*
  2.  * Metar Gear Solid: The Twin Snakes demuxer
  3.  * Copyright (c) 2012 Paul B Mahol
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/intreadwrite.h"
  23. #include "libavutil/intfloat.h"
  24. #include "avformat.h"
  25. #include "riff.h"
  26.  
  27. static int read_probe(AVProbeData *p)
  28. {
  29.     if (AV_RB32(p->buf     ) != 0x000E ||
  30.         AV_RB32(p->buf +  4) != 0x0050 ||
  31.         AV_RB32(p->buf + 12) != 0x0034)
  32.         return 0;
  33.     return AVPROBE_SCORE_MAX;
  34. }
  35.  
  36. static int read_header(AVFormatContext *s)
  37. {
  38.     AVIOContext *pb = s->pb;
  39.     AVStream    *st;
  40.     AVRational  fps;
  41.     uint32_t chunk_size;
  42.  
  43.     avio_skip(pb, 4);
  44.     chunk_size = avio_rb32(pb);
  45.     if (chunk_size != 80)
  46.         return AVERROR(EIO);
  47.     avio_skip(pb, 20);
  48.  
  49.     st = avformat_new_stream(s, 0);
  50.     if (!st)
  51.         return AVERROR(ENOMEM);
  52.  
  53.     st->need_parsing = AVSTREAM_PARSE_HEADERS;
  54.     st->start_time = 0;
  55.     st->nb_frames  =
  56.     st->duration   = avio_rb32(pb);
  57.     fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
  58.     st->codec->width  = avio_rb32(pb);
  59.     st->codec->height = avio_rb32(pb);
  60.     avio_skip(pb, 12);
  61.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  62.     st->codec->codec_tag  = avio_rb32(pb);
  63.     st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
  64.                                             st->codec->codec_tag);
  65.     avpriv_set_pts_info(st, 64, fps.den, fps.num);
  66.     avio_skip(pb, 20);
  67.  
  68.     return 0;
  69. }
  70.  
  71. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  72. {
  73.     AVIOContext *pb = s->pb;
  74.     uint32_t chunk_size, payload_size;
  75.     int ret;
  76.  
  77.     if (url_feof(pb))
  78.         return AVERROR_EOF;
  79.  
  80.     avio_skip(pb, 4);
  81.     chunk_size = avio_rb32(pb);
  82.     avio_skip(pb, 4);
  83.     payload_size = avio_rb32(pb);
  84.  
  85.     if (chunk_size < payload_size + 16)
  86.         return AVERROR(EIO);
  87.  
  88.     ret = av_get_packet(pb, pkt, payload_size);
  89.     if (ret < 0)
  90.         return ret;
  91.  
  92.     pkt->pos -= 16;
  93.     pkt->duration = 1;
  94.     avio_skip(pb, chunk_size - (ret + 16));
  95.  
  96.     return ret;
  97. }
  98.  
  99. AVInputFormat ff_mgsts_demuxer = {
  100.     .name        = "mgsts",
  101.     .long_name   = NULL_IF_CONFIG_SMALL("Metal Gear Solid: The Twin Snakes"),
  102.     .read_probe  = read_probe,
  103.     .read_header = read_header,
  104.     .read_packet = read_packet,
  105.     .flags       = AVFMT_GENERIC_INDEX,
  106. };
  107.