File indexing completed on 2024-12-22 05:33:12

 <?php
 /////////////////////////////////////////////////////////////////
 /// getID3() by James Heinrich <info@getid3.org>               //
 //  available at http://getid3.sourceforge.net                 //
 //            or http://www.getid3.org                         //
 //          also https://github.com/JamesHeinrich/getID3       //
 /////////////////////////////////////////////////////////////////
 // See readme.txt for more details                             //
 /////////////////////////////////////////////////////////////////
 //                                                             //
 // module.audio-video.swf.php                                  //
 // module for analyzing Shockwave Flash files                  //
 // dependencies: NONE                                          //
 //                                                            ///
 /////////////////////////////////////////////////////////////////
 
 
 class getid3_swf extends getid3_handler
 {
   public $ReturnAllTagData = false;
 
   public function Analyze() {
     $info = &$this->getid3->info;
 
     $info['fileformat']          = 'swf';
     $info['video']['dataformat'] = 'swf';
 
     // http://www.openswf.org/spec/SWFfileformat.html
 
     $this->fseek($info['avdataoffset']);
 
     $SWFfileData = $this->fread($info['avdataend'] - $info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
 
     $info['swf']['header']['signature']  = substr($SWFfileData, 0, 3);
     switch ($info['swf']['header']['signature']) {
       case 'FWS':
         $info['swf']['header']['compressed'] = false;
         break;
 
       case 'CWS':
         $info['swf']['header']['compressed'] = true;
         break;
 
       default:
         $info['error'][] = 'Expecting "FWS" or "CWS" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['swf']['header']['signature']).'"';
         unset($info['swf']);
         unset($info['fileformat']);
         return false;
         break;
     }
     $info['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1));
     $info['swf']['header']['length']  = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4));
 
     if ($info['swf']['header']['compressed']) {
       $SWFHead     = substr($SWFfileData, 0, 8);
       $SWFfileData = substr($SWFfileData, 8);
       if ($decompressed = @gzuncompress($SWFfileData)) {
         $SWFfileData = $SWFHead.$decompressed;
       } else {
         $info['error'][] = 'Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($info['swf']['header']['length'] - 8).' bytes uncompressed)';
         return false;
       }
     }
 
     $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
     $FrameSizeDataLength   = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8);
     $FrameSizeDataString   = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT);
     for ($i = 1; $i < $FrameSizeDataLength; $i++) {
       $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
     }
     list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
     $info['swf']['header']['frame_width']  = getid3_lib::Bin2Dec($X2);
     $info['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($Y2);
 
     // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
     // Next in the header is the frame rate, which is kind of weird.
     // It is supposed to be stored as a 16bit integer, but the first byte
     // (or last depending on how you look at it) is completely ignored.
     // Example: 0x000C  ->  0x0C  ->  12     So the frame rate is 12 fps.
 
     // Byte at (8 + $FrameSizeDataLength) is always zero and ignored
     $info['swf']['header']['frame_rate']  = getid3_lib::LittleEndian2Int(substr($SWFfileData,  9 + $FrameSizeDataLength, 1));
     $info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2));
 
     $info['video']['frame_rate']         = $info['swf']['header']['frame_rate'];
     $info['video']['resolution_x']       = intval(round($info['swf']['header']['frame_width']  / 20));
     $info['video']['resolution_y']       = intval(round($info['swf']['header']['frame_height'] / 20));
     $info['video']['pixel_aspect_ratio'] = (float) 1;
 
     if (($info['swf']['header']['frame_count'] > 0) && ($info['swf']['header']['frame_rate'] > 0)) {
       $info['playtime_seconds'] = $info['swf']['header']['frame_count'] / $info['swf']['header']['frame_rate'];
     }
 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
 
 
     // SWF tags
 
     $CurrentOffset = 12 + $FrameSizeDataLength;
     $SWFdataLength = strlen($SWFfileData);
 
     while ($CurrentOffset < $SWFdataLength) {
 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
 
       $TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
       $TagID     = ($TagIDTagLength & 0xFFFC) >> 6;
       $TagLength = ($TagIDTagLength & 0x003F);
       $CurrentOffset += 2;
       if ($TagLength == 0x3F) {
         $TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
         $CurrentOffset += 4;
       }
 
       unset($TagData);
       $TagData['offset'] = $CurrentOffset;
       $TagData['size']   = $TagLength;
       $TagData['id']     = $TagID;
       $TagData['data']   = substr($SWFfileData, $CurrentOffset, $TagLength);
       switch ($TagID) {
         case 0: // end of movie
           break 2;
 
         case 9: // Set background color
           //$info['swf']['tags'][] = $TagData;
           $info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
           break;
 
         default:
           if ($this->ReturnAllTagData) {
             $info['swf']['tags'][] = $TagData;
           }
           break;
       }
 
       $CurrentOffset += $TagLength;
     }
 
     return true;
   }
 
 }