LCOV - code coverage report
Current view: top level - src/libavformat - 3dostr.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 5 91 5.5 %
Date: 2017-01-28 02:43:52 Functions: 1 3 33.3 %

          Line data    Source code
       1             : /*
       2             :  * 3DO STR demuxer
       3             :  * Copyright (c) 2015 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 "avformat.h"
      23             : #include "internal.h"
      24             : 
      25        5565 : static int threedostr_probe(AVProbeData *p)
      26             : {
      27       11130 :     if (memcmp(p->buf, "CTRL", 4) &&
      28       11130 :         memcmp(p->buf, "SHDR", 4) &&
      29        5565 :         memcmp(p->buf, "SNDS", 4))
      30        5565 :         return 0;
      31             : 
      32           0 :     return AVPROBE_SCORE_MAX / 3 * 2;
      33             : }
      34             : 
      35           0 : static int threedostr_read_header(AVFormatContext *s)
      36             : {
      37           0 :     unsigned chunk, codec = 0, size, ctrl_size = -1, found_shdr = 0;
      38             :     AVStream *st;
      39             : 
      40           0 :     while (!avio_feof(s->pb) && !found_shdr) {
      41           0 :         chunk = avio_rl32(s->pb);
      42           0 :         size  = avio_rb32(s->pb);
      43             : 
      44           0 :         if (size < 8)
      45           0 :             return AVERROR_INVALIDDATA;
      46           0 :         size -= 8;
      47             : 
      48           0 :         switch (chunk) {
      49             :         case MKTAG('C','T','R','L'):
      50           0 :             ctrl_size = size;
      51           0 :             break;
      52             :         case MKTAG('S','N','D','S'):
      53           0 :             if (size < 56)
      54           0 :                 return AVERROR_INVALIDDATA;
      55           0 :             avio_skip(s->pb, 8);
      56           0 :             if (avio_rl32(s->pb) != MKTAG('S','H','D','R'))
      57           0 :                 return AVERROR_INVALIDDATA;
      58           0 :             avio_skip(s->pb, 24);
      59             : 
      60           0 :             st = avformat_new_stream(s, NULL);
      61           0 :             if (!st)
      62           0 :                 return AVERROR(ENOMEM);
      63             : 
      64           0 :             st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
      65           0 :             st->codecpar->sample_rate = avio_rb32(s->pb);
      66           0 :             st->codecpar->channels    = avio_rb32(s->pb);
      67           0 :             if (st->codecpar->channels <= 0)
      68           0 :                 return AVERROR_INVALIDDATA;
      69           0 :             codec                  = avio_rl32(s->pb);
      70           0 :             avio_skip(s->pb, 4);
      71           0 :             if (ctrl_size == 20 || ctrl_size == 3 || ctrl_size == -1)
      72           0 :                 st->duration       = (avio_rb32(s->pb) - 1) / st->codecpar->channels;
      73             :             else
      74           0 :                 st->duration       = avio_rb32(s->pb) * 16 / st->codecpar->channels;
      75           0 :             size -= 56;
      76           0 :             found_shdr = 1;
      77           0 :             break;
      78             :         case MKTAG('S','H','D','R'):
      79           0 :             if (size >  0x78) {
      80           0 :                 avio_skip(s->pb, 0x74);
      81           0 :                 size -= 0x78;
      82           0 :                 if (avio_rl32(s->pb) == MKTAG('C','T','R','L') && size > 4) {
      83           0 :                     ctrl_size = avio_rb32(s->pb);
      84           0 :                     size -= 4;
      85             :                 }
      86             :             }
      87           0 :             break;
      88             :         default:
      89           0 :             av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
      90           0 :             break;
      91             :         }
      92             : 
      93           0 :         avio_skip(s->pb, size);
      94             :     }
      95             : 
      96           0 :     switch (codec) {
      97             :     case MKTAG('S','D','X','2'):
      98           0 :         st->codecpar->codec_id    = AV_CODEC_ID_SDX2_DPCM;
      99           0 :         st->codecpar->block_align = 1 * st->codecpar->channels;
     100           0 :         break;
     101             :     default:
     102           0 :         avpriv_request_sample(s, "codec %X", codec);
     103           0 :         return AVERROR_PATCHWELCOME;
     104             :     }
     105             : 
     106           0 :     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
     107             : 
     108           0 :     return 0;
     109             : }
     110             : 
     111           0 : static int threedostr_read_packet(AVFormatContext *s, AVPacket *pkt)
     112             : {
     113           0 :     unsigned chunk, size, found_ssmp = 0;
     114           0 :     AVStream *st = s->streams[0];
     115             :     int64_t pos;
     116           0 :     int ret = 0;
     117             : 
     118           0 :     while (!found_ssmp) {
     119           0 :         if (avio_feof(s->pb))
     120           0 :             return AVERROR_EOF;
     121             : 
     122           0 :         pos   = avio_tell(s->pb);
     123           0 :         chunk = avio_rl32(s->pb);
     124           0 :         size  = avio_rb32(s->pb);
     125             : 
     126           0 :         if (!size)
     127           0 :             continue;
     128             : 
     129           0 :         if (size < 8)
     130           0 :             return AVERROR_INVALIDDATA;
     131           0 :         size -= 8;
     132             : 
     133           0 :         switch (chunk) {
     134             :         case MKTAG('S','N','D','S'):
     135           0 :             if (size <= 16)
     136           0 :                 return AVERROR_INVALIDDATA;
     137           0 :             avio_skip(s->pb, 8);
     138           0 :             if (avio_rl32(s->pb) != MKTAG('S','S','M','P'))
     139           0 :                 return AVERROR_INVALIDDATA;
     140           0 :             avio_skip(s->pb, 4);
     141           0 :             size -= 16;
     142           0 :             ret = av_get_packet(s->pb, pkt, size);
     143           0 :             pkt->pos = pos;
     144           0 :             pkt->stream_index = 0;
     145           0 :             pkt->duration = size / st->codecpar->channels;
     146           0 :             size = 0;
     147           0 :             found_ssmp = 1;
     148           0 :             break;
     149             :         default:
     150           0 :             av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
     151           0 :             break;
     152             :         }
     153             : 
     154           0 :         avio_skip(s->pb, size);
     155             :     }
     156             : 
     157           0 :     return ret;
     158             : }
     159             : 
     160             : AVInputFormat ff_threedostr_demuxer = {
     161             :     .name           = "3dostr",
     162             :     .long_name      = NULL_IF_CONFIG_SMALL("3DO STR"),
     163             :     .read_probe     = threedostr_probe,
     164             :     .read_header    = threedostr_read_header,
     165             :     .read_packet    = threedostr_read_packet,
     166             :     .extensions     = "str",
     167             :     .flags          = AVFMT_GENERIC_INDEX,
     168             : };

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