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

   1 <?php
   2
   3 /////////////////////////////////////////////////////////////////
   4 /// getID3() by James Heinrich <info@getid3.org>               //
   5 //  available at https://github.com/JamesHeinrich/getID3       //
   6 //            or https://www.getid3.org                        //
   7 //            or http://getid3.sourceforge.net                 //
   8 //  see readme.txt for more details                            //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.audio-video.swf.php                                  //
  12 // module for analyzing Shockwave Flash files                  //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_swf extends getid3_handler
  19 {
  20         public $ReturnAllTagData = false;
  21
  22         /**
  23          * @return bool
  24          */
  25         public function Analyze() {
  26                 $info = &$this->getid3->info;
  27
  28                 $info['fileformat']          = 'swf';
  29                 $info['video']['dataformat'] = 'swf';
  30
  31                 // http://www.openswf.org/spec/SWFfileformat.html
  32
  33                 $this->fseek($info['avdataoffset']);
  34
  35                 $SWFfileData = $this->fread($info['avdataend'] - $info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
  36
  37                 $info['swf']['header']['signature']  = substr($SWFfileData, 0, 3);
  38                 switch ($info['swf']['header']['signature']) {
  39                         case 'FWS':
  40                                 $info['swf']['header']['compressed'] = false;
  41                                 break;
  42
  43                         case 'CWS':
  44                                 $info['swf']['header']['compressed'] = true;
  45                                 break;
  46
  47                         default:
  48                                 $this->error('Expecting "FWS" or "CWS" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['swf']['header']['signature']).'"');
  49                                 unset($info['swf']);
  50                                 unset($info['fileformat']);
  51                                 return false;
  52                                 break;
  53                 }
  54                 $info['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1));
  55                 $info['swf']['header']['length']  = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4));
  56
  57                 if ($info['swf']['header']['compressed']) {
  58                         $SWFHead     = substr($SWFfileData, 0, 8);
  59                         $SWFfileData = substr($SWFfileData, 8);
  60                         if ($decompressed = @gzuncompress($SWFfileData)) {
  61                                 $SWFfileData = $SWFHead.$decompressed;
  62                         } else {
  63                                 $this->error('Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($info['swf']['header']['length'] - 8).' bytes uncompressed)');
  64                                 return false;
  65                         }
  66                 }
  67
  68                 $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
  69                 $FrameSizeDataLength   = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8);
  70                 $FrameSizeDataString   = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT);
  71                 for ($i = 1; $i < $FrameSizeDataLength; $i++) {
  72                         $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
  73                 }
  74                 list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
  75                 $info['swf']['header']['frame_width']  = getid3_lib::Bin2Dec($X2);
  76                 $info['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($Y2);
  77
  78                 // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
  79                 // Next in the header is the frame rate, which is kind of weird.
  80                 // It is supposed to be stored as a 16bit integer, but the first byte
  81                 // (or last depending on how you look at it) is completely ignored.
  82                 // Example: 0x000C  ->  0x0C  ->  12     So the frame rate is 12 fps.
  83
  84                 // Byte at (8 + $FrameSizeDataLength) is always zero and ignored
  85                 $info['swf']['header']['frame_rate']  = getid3_lib::LittleEndian2Int(substr($SWFfileData,  9 + $FrameSizeDataLength, 1));
  86                 $info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2));
  87
  88                 $info['video']['frame_rate']         = $info['swf']['header']['frame_rate'];
  89                 $info['video']['resolution_x']       = intval(round($info['swf']['header']['frame_width']  / 20));
  90                 $info['video']['resolution_y']       = intval(round($info['swf']['header']['frame_height'] / 20));
  91                 $info['video']['pixel_aspect_ratio'] = (float) 1;
  92
  93                 if (($info['swf']['header']['frame_count'] > 0) && ($info['swf']['header']['frame_rate'] > 0)) {
  94                         $info['playtime_seconds'] = $info['swf']['header']['frame_count'] / $info['swf']['header']['frame_rate'];
  95                 }
  96 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
  97
  98
  99                 // SWF tags
 100
 101                 $CurrentOffset = 12 + $FrameSizeDataLength;
 102                 $SWFdataLength = strlen($SWFfileData);
 103
 104                 while ($CurrentOffset < $SWFdataLength) {
 105 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
 106
 107                         $TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
 108                         $TagID     = ($TagIDTagLength & 0xFFFC) >> 6;
 109                         $TagLength = ($TagIDTagLength & 0x003F);
 110                         $CurrentOffset += 2;
 111                         if ($TagLength == 0x3F) {
 112                                 $TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
 113                                 $CurrentOffset += 4;
 114                         }
 115
 116                         unset($TagData);
 117                         $TagData['offset'] = $CurrentOffset;
 118                         $TagData['size']   = $TagLength;
 119                         $TagData['id']     = $TagID;
 120                         $TagData['data']   = substr($SWFfileData, $CurrentOffset, $TagLength);
 121                         switch ($TagID) {
 122                                 case 0: // end of movie
 123                                         break 2;
 124
 125                                 case 9: // Set background color
 126                                         //$info['swf']['tags'][] = $TagData;
 127                                         $info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
 128                                         break;
 129
 130                                 default:
 131                                         if ($this->ReturnAllTagData) {
 132                                                 $info['swf']['tags'][] = $TagData;
 133                                         }
 134                                         break;
 135                         }
 136
 137                         $CurrentOffset += $TagLength;
 138                 }
 139
 140                 return true;
 141         }
 142
 143 }