LCOV - code coverage report
Current view: top level - libavformat - lvfdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 84 3.6 %
Date: 2017-12-14 08:27:08 Functions: 1 3 33.3 %

          Line data    Source code
       1             : /*
       2             :  * LVF 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 "avformat.h"
      24             : #include "riff.h"
      25             : 
      26        6130 : static int lvf_probe(AVProbeData *p)
      27             : {
      28        6130 :     if (AV_RL32(p->buf) != MKTAG('L', 'V', 'F', 'F'))
      29        6130 :         return 0;
      30             : 
      31           0 :     if (!AV_RL32(p->buf + 16) || AV_RL32(p->buf + 16) > 256)
      32           0 :         return AVPROBE_SCORE_MAX / 8;
      33             : 
      34           0 :     return AVPROBE_SCORE_EXTENSION;
      35             : }
      36             : 
      37           0 : static int lvf_read_header(AVFormatContext *s)
      38             : {
      39             :     AVStream *st;
      40             :     int64_t next_offset;
      41             :     unsigned size, nb_streams, id;
      42             : 
      43           0 :     avio_skip(s->pb, 16);
      44           0 :     nb_streams = avio_rl32(s->pb);
      45           0 :     if (!nb_streams)
      46           0 :         return AVERROR_INVALIDDATA;
      47           0 :     if (nb_streams > 2) {
      48           0 :         avpriv_request_sample(s, "%d streams", nb_streams);
      49           0 :         return AVERROR_PATCHWELCOME;
      50             :     }
      51             : 
      52           0 :     avio_skip(s->pb, 1012);
      53             : 
      54           0 :     while (!avio_feof(s->pb)) {
      55           0 :         id          = avio_rl32(s->pb);
      56           0 :         size        = avio_rl32(s->pb);
      57           0 :         next_offset = avio_tell(s->pb) + size;
      58             : 
      59           0 :         switch (id) {
      60           0 :         case MKTAG('0', '0', 'f', 'm'):
      61           0 :             st = avformat_new_stream(s, 0);
      62           0 :             if (!st)
      63           0 :                 return AVERROR(ENOMEM);
      64             : 
      65           0 :             st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
      66           0 :             avio_skip(s->pb, 4);
      67           0 :             st->codecpar->width      = avio_rl32(s->pb);
      68           0 :             st->codecpar->height     = avio_rl32(s->pb);
      69           0 :             avio_skip(s->pb, 4);
      70           0 :             st->codecpar->codec_tag  = avio_rl32(s->pb);
      71           0 :             st->codecpar->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
      72           0 :                                                        st->codecpar->codec_tag);
      73           0 :             avpriv_set_pts_info(st, 32, 1, 1000);
      74           0 :             break;
      75           0 :         case MKTAG('0', '1', 'f', 'm'):
      76           0 :             st = avformat_new_stream(s, 0);
      77           0 :             if (!st)
      78           0 :                 return AVERROR(ENOMEM);
      79             : 
      80           0 :             st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
      81           0 :             st->codecpar->codec_tag   = avio_rl16(s->pb);
      82           0 :             st->codecpar->channels    = avio_rl16(s->pb);
      83           0 :             st->codecpar->sample_rate = avio_rl16(s->pb);
      84           0 :             avio_skip(s->pb, 8);
      85           0 :             st->codecpar->bits_per_coded_sample = avio_r8(s->pb);
      86           0 :             st->codecpar->codec_id    = ff_codec_get_id(ff_codec_wav_tags,
      87           0 :                                                         st->codecpar->codec_tag);
      88           0 :             avpriv_set_pts_info(st, 32, 1, 1000);
      89           0 :             break;
      90           0 :         case 0:
      91           0 :             avio_seek(s->pb, 2048 + 8, SEEK_SET);
      92           0 :             return 0;
      93           0 :         default:
      94           0 :             avpriv_request_sample(s, "id %d", id);
      95           0 :             return AVERROR_PATCHWELCOME;
      96             :         }
      97             : 
      98           0 :         avio_seek(s->pb, next_offset, SEEK_SET);
      99             :     }
     100             : 
     101           0 :     return AVERROR_EOF;
     102             : }
     103             : 
     104           0 : static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
     105             : {
     106             :     unsigned size, flags, timestamp, id;
     107             :     int64_t pos;
     108           0 :     int ret, is_video = 0;
     109             : 
     110           0 :     pos = avio_tell(s->pb);
     111           0 :     while (!avio_feof(s->pb)) {
     112           0 :         id    = avio_rl32(s->pb);
     113           0 :         size  = avio_rl32(s->pb);
     114             : 
     115           0 :         if (size == 0xFFFFFFFFu)
     116           0 :             return AVERROR_EOF;
     117             : 
     118           0 :         switch (id) {
     119           0 :         case MKTAG('0', '0', 'd', 'c'):
     120           0 :             is_video = 1;
     121           0 :         case MKTAG('0', '1', 'w', 'b'):
     122           0 :             if (size < 8)
     123           0 :                 return AVERROR_INVALIDDATA;
     124           0 :             timestamp = avio_rl32(s->pb);
     125           0 :             flags = avio_rl32(s->pb);
     126           0 :             ret = av_get_packet(s->pb, pkt, size - 8);
     127           0 :             if (flags & (1 << 12))
     128           0 :                 pkt->flags |= AV_PKT_FLAG_KEY;
     129           0 :             pkt->stream_index = is_video ? 0 : 1;
     130           0 :             pkt->pts          = timestamp;
     131           0 :             pkt->pos          = pos;
     132           0 :             return ret;
     133           0 :         default:
     134           0 :             ret = avio_skip(s->pb, size);
     135             :         }
     136             : 
     137           0 :         if (ret < 0)
     138           0 :             return ret;
     139             :     }
     140             : 
     141           0 :     return AVERROR_EOF;
     142             : }
     143             : 
     144             : AVInputFormat ff_lvf_demuxer = {
     145             :     .name        = "lvf",
     146             :     .long_name   = NULL_IF_CONFIG_SMALL("LVF"),
     147             :     .read_probe  = lvf_probe,
     148             :     .read_header = lvf_read_header,
     149             :     .read_packet = lvf_read_packet,
     150             :     .extensions  = "lvf",
     151             :     .flags       = AVFMT_GENERIC_INDEX,
     152             : };

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