www/plugins-dist/medias/lib/getid3/module.audio-video.ivf.php

   1 <?php
   2 /////////////////////////////////////////////////////////////////
   3 /// getID3() by James Heinrich <info@getid3.org>               //
   4 //  available at https://github.com/JamesHeinrich/getID3       //
   5 //            or https://www.getid3.org                        //
   6 //            or http://getid3.sourceforge.net                 //
   7 //  see readme.txt for more details                            //
   8 /////////////////////////////////////////////////////////////////
   9 //                                                             //
  10 // module.audio.ivf.php                                        //
  11 // module for analyzing IVF audio-video files                  //
  12 // dependencies: NONE                                          //
  13 //                                                            ///
  14 /////////////////////////////////////////////////////////////////
  15
  16 if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
  17         exit;
  18 }
  19
  20 class getid3_ivf extends getid3_handler
  21 {
  22         /**
  23          * @return bool
  24          */
  25         public function Analyze() {
  26                 $info = &$this->getid3->info;
  27
  28                 $info['fileformat']          = 'ivf';
  29                 $info['video']['dataformat'] = 'ivf';
  30
  31                 $this->fseek($info['avdataoffset']);
  32                 $IVFheader = $this->fread(32);
  33
  34                 if (substr($IVFheader, 0, 4) == 'DKIF') {
  35
  36                         // https://wiki.multimedia.cx/index.php/IVF
  37                         $info['ivf']['header']['signature']            =                              substr($IVFheader,  0, 4);
  38                         $info['ivf']['header']['version']              = getid3_lib::LittleEndian2Int(substr($IVFheader,  4, 2)); // should be 0
  39                         $info['ivf']['header']['headersize']           = getid3_lib::LittleEndian2Int(substr($IVFheader,  6, 2));
  40                         $info['ivf']['header']['fourcc']               =                              substr($IVFheader,  8, 4);
  41                         $info['ivf']['header']['resolution_x']         = getid3_lib::LittleEndian2Int(substr($IVFheader, 12, 2));
  42                         $info['ivf']['header']['resolution_y']         = getid3_lib::LittleEndian2Int(substr($IVFheader, 14, 2));
  43                         $info['ivf']['header']['timebase_numerator']   = getid3_lib::LittleEndian2Int(substr($IVFheader, 16, 4));
  44                         $info['ivf']['header']['timebase_denominator'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 20, 4));
  45                         $info['ivf']['header']['frame_count']          = getid3_lib::LittleEndian2Int(substr($IVFheader, 24, 4));
  46                         //$info['ivf']['header']['reserved']             =                              substr($IVFheader, 28, 4);
  47
  48                         $info['ivf']['header']['frame_rate'] = (float) $info['ivf']['header']['timebase_numerator'] / $info['ivf']['header']['timebase_denominator'];
  49
  50                         if ($info['ivf']['header']['version'] > 0) {
  51                                 $this->warning('Expecting IVF header version 0, found version '.$info['ivf']['header']['version'].', results may not be accurate');
  52                         }
  53
  54                         $info['video']['resolution_x']    =         $info['ivf']['header']['resolution_x'];
  55                         $info['video']['resolution_y']    =         $info['ivf']['header']['resolution_y'];
  56                         $info['video']['codec']           =         $info['ivf']['header']['fourcc'];
  57
  58                         $info['ivf']['frame_count'] = 0;
  59                         while (!$this->feof()) {
  60                                 if ($frameheader = $this->fread(12)) {
  61                                         $framesize = getid3_lib::LittleEndian2Int(substr($frameheader, 0, 4)); // size of frame in bytes (not including the 12-byte header)
  62                                         $timestamp = getid3_lib::LittleEndian2Int(substr($frameheader, 4, 8)); // 64-bit presentation timestamp
  63                                         $this->fseek($framesize, SEEK_CUR);
  64                                         $info['ivf']['frame_count']++;
  65                                 }
  66                         }
  67                         if ($info['ivf']['frame_count']) {
  68                                 $info['playtime_seconds']    = $timestamp / 100000;
  69                                 $info['video']['frame_rate'] = (float) $info['ivf']['frame_count'] / $info['playtime_seconds'];
  70                         }
  71
  72                 } else {
  73                         $this->error('Expecting "DKIF" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($IVFheader, 0, 4)).'"');
  74                         return false;
  75                 }
  76
  77                 return true;
  78         }
  79
  80 }