LCOV - code coverage report
Current view: top level - libavformat - mgsts.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 48 6.2 %
Date: 2017-12-17 23:02:56 Functions: 1 3 33.3 %

          Line data    Source code
       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        6130 : static int read_probe(AVProbeData *p)
      28             : {
      29        6130 :     if (AV_RB32(p->buf     ) != 0x000E ||
      30           0 :         AV_RB32(p->buf +  4) != 0x0050 ||
      31           0 :         AV_RB32(p->buf + 12) != 0x0034)
      32        6130 :         return 0;
      33           0 :     return AVPROBE_SCORE_MAX;
      34             : }
      35             : 
      36           0 : static int read_header(AVFormatContext *s)
      37             : {
      38           0 :     AVIOContext *pb = s->pb;
      39             :     AVStream    *st;
      40             :     AVRational  fps;
      41             :     uint32_t chunk_size;
      42             : 
      43           0 :     avio_skip(pb, 4);
      44           0 :     chunk_size = avio_rb32(pb);
      45           0 :     if (chunk_size != 80)
      46           0 :         return AVERROR(EIO);
      47           0 :     avio_skip(pb, 20);
      48             : 
      49           0 :     st = avformat_new_stream(s, 0);
      50           0 :     if (!st)
      51           0 :         return AVERROR(ENOMEM);
      52             : 
      53           0 :     st->need_parsing = AVSTREAM_PARSE_HEADERS;
      54           0 :     st->start_time = 0;
      55           0 :     st->nb_frames  =
      56           0 :     st->duration   = avio_rb32(pb);
      57           0 :     fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
      58           0 :     st->codecpar->width  = avio_rb32(pb);
      59           0 :     st->codecpar->height = avio_rb32(pb);
      60           0 :     avio_skip(pb, 12);
      61           0 :     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
      62           0 :     st->codecpar->codec_tag  = avio_rb32(pb);
      63           0 :     st->codecpar->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
      64           0 :                                                st->codecpar->codec_tag);
      65           0 :     avpriv_set_pts_info(st, 64, fps.den, fps.num);
      66           0 :     avio_skip(pb, 20);
      67             : 
      68           0 :     return 0;
      69             : }
      70             : 
      71           0 : static int read_packet(AVFormatContext *s, AVPacket *pkt)
      72             : {
      73           0 :     AVIOContext *pb = s->pb;
      74             :     uint32_t chunk_size, payload_size;
      75             :     int ret;
      76             : 
      77           0 :     if (avio_feof(pb))
      78           0 :         return AVERROR_EOF;
      79             : 
      80           0 :     avio_skip(pb, 4);
      81           0 :     chunk_size = avio_rb32(pb);
      82           0 :     avio_skip(pb, 4);
      83           0 :     payload_size = avio_rb32(pb);
      84             : 
      85           0 :     if (chunk_size < payload_size + 16)
      86           0 :         return AVERROR(EIO);
      87             : 
      88           0 :     ret = av_get_packet(pb, pkt, payload_size);
      89           0 :     if (ret < 0)
      90           0 :         return ret;
      91             : 
      92           0 :     pkt->pos -= 16;
      93           0 :     pkt->duration = 1;
      94           0 :     avio_skip(pb, chunk_size - (ret + 16));
      95             : 
      96           0 :     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             : };

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