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   1  <?php
   2  /////////////////////////////////////////////////////////////////
   3  /// getID3() by James Heinrich <info@getid3.org>               //
   4  //  available at http://getid3.sourceforge.net                 //
   5  //            or http://www.getid3.org                         //
   6  /////////////////////////////////////////////////////////////////
   7  // See readme.txt for more details                             //
   8  /////////////////////////////////////////////////////////////////
   9  //                                                             //
  10  // module.audio-video.swf.php                                  //
  11  // module for analyzing Shockwave Flash files                  //
  12  // dependencies: NONE                                          //
  13  //                                                            ///
  14  /////////////////////////////////////////////////////////////////
  15  
  16  
  17  class getid3_swf
  18  {
  19  
  20  	function getid3_swf(&$fd, &$ThisFileInfo, $ReturnAllTagData=false) {
  21  //$start_time = microtime(true);
  22          $ThisFileInfo['fileformat']          = 'swf';
  23          $ThisFileInfo['video']['dataformat'] = 'swf';
  24  
  25          // http://www.openswf.org/spec/SWFfileformat.html
  26  
  27          fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
  28  
  29          $SWFfileData = fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
  30  
  31          $ThisFileInfo['swf']['header']['signature']  = substr($SWFfileData, 0, 3);
  32          switch ($ThisFileInfo['swf']['header']['signature']) {
  33              case 'FWS':
  34                  $ThisFileInfo['swf']['header']['compressed'] = false;
  35                  break;
  36  
  37              case 'CWS':
  38                  $ThisFileInfo['swf']['header']['compressed'] = true;
  39                  break;
  40  
  41              default:
  42                  $ThisFileInfo['error'][] = 'Expecting "FWS" or "CWS" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['swf']['header']['signature'].'"';
  43                  unset($ThisFileInfo['swf']);
  44                  unset($ThisFileInfo['fileformat']);
  45                  return false;
  46                  break;
  47          }
  48          $ThisFileInfo['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1));
  49          $ThisFileInfo['swf']['header']['length']  = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4));
  50  
  51  //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
  52  
  53          if ($ThisFileInfo['swf']['header']['compressed']) {
  54  
  55              $SWFHead     = substr($SWFfileData, 0, 8);
  56              $SWFfileData = substr($SWFfileData, 8);
  57              if ($decompressed = @gzuncompress($SWFfileData)) {
  58  
  59                  $SWFfileData = $SWFHead.$decompressed;
  60  
  61              } else {
  62  
  63                  $ThisFileInfo['error'][] = 'Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($ThisFileInfo['swf']['header']['length'] - 8).' bytes uncompressed)';
  64                  return false;
  65  
  66              }
  67  
  68          }
  69  //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
  70  
  71          $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
  72          $FrameSizeDataLength   = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8);
  73          $FrameSizeDataString   = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT);
  74          for ($i = 1; $i < $FrameSizeDataLength; $i++) {
  75              $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
  76          }
  77          list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
  78          $ThisFileInfo['swf']['header']['frame_width']  = getid3_lib::Bin2Dec($X2);
  79          $ThisFileInfo['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($Y2);
  80  
  81          // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
  82          // Next in the header is the frame rate, which is kind of weird.
  83          // It is supposed to be stored as a 16bit integer, but the first byte
  84          // (or last depending on how you look at it) is completely ignored.
  85          // Example: 0x000C  ->  0x0C  ->  12     So the frame rate is 12 fps.
  86  
  87          // Byte at (8 + $FrameSizeDataLength) is always zero and ignored
  88          $ThisFileInfo['swf']['header']['frame_rate']  = getid3_lib::LittleEndian2Int(substr($SWFfileData,  9 + $FrameSizeDataLength, 1));
  89          $ThisFileInfo['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2));
  90  
  91          $ThisFileInfo['video']['frame_rate']         = $ThisFileInfo['swf']['header']['frame_rate'];
  92          $ThisFileInfo['video']['resolution_x']       = intval(round($ThisFileInfo['swf']['header']['frame_width']  / 20));
  93          $ThisFileInfo['video']['resolution_y']       = intval(round($ThisFileInfo['swf']['header']['frame_height'] / 20));
  94          $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
  95  
  96          if (($ThisFileInfo['swf']['header']['frame_count'] > 0) && ($ThisFileInfo['swf']['header']['frame_rate'] > 0)) {
  97              $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['swf']['header']['frame_count'] / $ThisFileInfo['swf']['header']['frame_rate'];
  98          }
  99  //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
 100  
 101  
 102          // SWF tags
 103  
 104          $CurrentOffset = 12 + $FrameSizeDataLength;
 105          $SWFdataLength = strlen($SWFfileData);
 106  
 107          while ($CurrentOffset < $SWFdataLength) {
 108  //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
 109  
 110              $TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
 111              $TagID     = ($TagIDTagLength & 0xFFFC) >> 6;
 112              $TagLength = ($TagIDTagLength & 0x003F);
 113              $CurrentOffset += 2;
 114              if ($TagLength == 0x3F) {
 115                  $TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
 116                  $CurrentOffset += 4;
 117              }
 118  
 119              unset($TagData);
 120              $TagData['offset'] = $CurrentOffset;
 121              $TagData['size']   = $TagLength;
 122              $TagData['id']     = $TagID;
 123              $TagData['data']   = substr($SWFfileData, $CurrentOffset, $TagLength);
 124              switch ($TagID) {
 125                  case 0: // end of movie
 126                      break 2;
 127  
 128                  case 9: // Set background color
 129                      //$ThisFileInfo['swf']['tags'][] = $TagData;
 130                      $ThisFileInfo['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
 131                      break;
 132  
 133                  default:
 134                      if ($ReturnAllTagData) {
 135                          $ThisFileInfo['swf']['tags'][] = $TagData;
 136                      }
 137                      break;
 138              }
 139  
 140              $CurrentOffset += $TagLength;
 141          }
 142  
 143          return true;
 144      }
 145  
 146  }
 147  
 148  
 149  ?>