File zp-extensions/class-video/getid3/module.audio-video.swf.php

  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: //          also https://github.com/JamesHeinrich/getID3       //
  7: /////////////////////////////////////////////////////////////////
  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:     public function Analyze() {
 23:         $info = &$this->getid3->info;
 24: 
 25:         $info['fileformat']          = 'swf';
 26:         $info['video']['dataformat'] = 'swf';
 27: 
 28:         // http://www.openswf.org/spec/SWFfileformat.html
 29: 
 30:         $this->fseek($info['avdataoffset']);
 31: 
 32:         $SWFfileData = $this->fread($info['avdataend'] - $info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
 33: 
 34:         $info['swf']['header']['signature']  = substr($SWFfileData, 0, 3);
 35:         switch ($info['swf']['header']['signature']) {
 36:             case 'FWS':
 37:                 $info['swf']['header']['compressed'] = false;
 38:                 break;
 39: 
 40:             case 'CWS':
 41:                 $info['swf']['header']['compressed'] = true;
 42:                 break;
 43: 
 44:             default:
 45:                 $info['error'][] = 'Expecting "FWS" or "CWS" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['swf']['header']['signature']).'"';
 46:                 unset($info['swf']);
 47:                 unset($info['fileformat']);
 48:                 return false;
 49:                 break;
 50:         }
 51:         $info['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1));
 52:         $info['swf']['header']['length']  = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4));
 53: 
 54:         if ($info['swf']['header']['compressed']) {
 55:             $SWFHead     = substr($SWFfileData, 0, 8);
 56:             $SWFfileData = substr($SWFfileData, 8);
 57:             if ($decompressed = @gzuncompress($SWFfileData)) {
 58:                 $SWFfileData = $SWFHead.$decompressed;
 59:             } else {
 60:                 $info['error'][] = 'Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($info['swf']['header']['length'] - 8).' bytes uncompressed)';
 61:                 return false;
 62:             }
 63:         }
 64: 
 65:         $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
 66:         $FrameSizeDataLength   = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8);
 67:         $FrameSizeDataString   = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT);
 68:         for ($i = 1; $i < $FrameSizeDataLength; $i++) {
 69:             $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
 70:         }
 71:         list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
 72:         $info['swf']['header']['frame_width']  = getid3_lib::Bin2Dec($X2);
 73:         $info['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($Y2);
 74: 
 75:         // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
 76:         // Next in the header is the frame rate, which is kind of weird.
 77:         // It is supposed to be stored as a 16bit integer, but the first byte
 78:         // (or last depending on how you look at it) is completely ignored.
 79:         // Example: 0x000C  ->  0x0C  ->  12     So the frame rate is 12 fps.
 80: 
 81:         // Byte at (8 + $FrameSizeDataLength) is always zero and ignored
 82:         $info['swf']['header']['frame_rate']  = getid3_lib::LittleEndian2Int(substr($SWFfileData,  9 + $FrameSizeDataLength, 1));
 83:         $info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2));
 84: 
 85:         $info['video']['frame_rate']         = $info['swf']['header']['frame_rate'];
 86:         $info['video']['resolution_x']       = intval(round($info['swf']['header']['frame_width']  / 20));
 87:         $info['video']['resolution_y']       = intval(round($info['swf']['header']['frame_height'] / 20));
 88:         $info['video']['pixel_aspect_ratio'] = (float) 1;
 89: 
 90:         if (($info['swf']['header']['frame_count'] > 0) && ($info['swf']['header']['frame_rate'] > 0)) {
 91:             $info['playtime_seconds'] = $info['swf']['header']['frame_count'] / $info['swf']['header']['frame_rate'];
 92:         }
 93: //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
 94: 
 95: 
 96:         // SWF tags
 97: 
 98:         $CurrentOffset = 12 + $FrameSizeDataLength;
 99:         $SWFdataLength = strlen($SWFfileData);
100: 
101:         while ($CurrentOffset < $SWFdataLength) {
102: //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
103: 
104:             $TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
105:             $TagID     = ($TagIDTagLength & 0xFFFC) >> 6;
106:             $TagLength = ($TagIDTagLength & 0x003F);
107:             $CurrentOffset += 2;
108:             if ($TagLength == 0x3F) {
109:                 $TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
110:                 $CurrentOffset += 4;
111:             }
112: 
113:             unset($TagData);
114:             $TagData['offset'] = $CurrentOffset;
115:             $TagData['size']   = $TagLength;
116:             $TagData['id']     = $TagID;
117:             $TagData['data']   = substr($SWFfileData, $CurrentOffset, $TagLength);
118:             switch ($TagID) {
119:                 case 0: // end of movie
120:                     break 2;
121: 
122:                 case 9: // Set background color
123:                     //$info['swf']['tags'][] = $TagData;
124:                     $info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
125:                     break;
126: 
127:                 default:
128:                     if ($this->ReturnAllTagData) {
129:                         $info['swf']['tags'][] = $TagData;
130:                     }
131:                     break;
132:             }
133: 
134:             $CurrentOffset += $TagLength;
135:         }
136: 
137:         return true;
138:     }
139: 
140: }
141:
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