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File: includes/getid3/module.audio-video.swf.php

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio-video.swf.php  >  Download  
File: includes/getid3/module.audio-video.swf.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 1 year ago
Size: 5,747 bytes
 

Contents

Class file image Download
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// 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
{
    var 
$ReturnAllTagData false;

    function 
Analyze() {
        
$info = &$this->getid3->info;

        
$info['fileformat']          = 'swf';
        
$info['video']['dataformat'] = 'swf';

        
// http://www.openswf.org/spec/SWFfileformat.html

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);

        
$SWFfileData fread($this->getid3->fp$info['avdataend'] - $info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data

        
$info['swf']['header']['signature']  = substr($SWFfileData03);
        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;
        }
        
$info['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData31));
        
$info['swf']['header']['length']  = getid3_lib::LittleEndian2Int(substr($SWFfileData44));

        if (
$info['swf']['header']['compressed']) {
            
$SWFHead     substr($SWFfileData08);
            
$SWFfileData substr($SWFfileData8);
            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;
            }
        }

        
$FrameSizeBitsPerValue = (ord(substr($SWFfileData81)) & 0xF8) >> 3;
        
$FrameSizeDataLength   ceil((+ ($FrameSizeBitsPerValue)) / 8);
        
$FrameSizeDataString   str_pad(decbin(ord(substr($SWFfileData81)) & 0x07), 3'0'STR_PAD_LEFT);
        for (
$i 1$i $FrameSizeDataLength$i++) {
            
$FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData$i1))), 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,  $FrameSizeDataLength1));
        
$info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData10 $FrameSizeDataLength2));

        
$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$CurrentOffset2));
            
$TagID     = ($TagIDTagLength 0xFFFC) >> 6;
            
$TagLength = ($TagIDTagLength 0x003F);
            
$CurrentOffset += 2;
            if (
$TagLength == 0x3F) {
                
$TagLength getid3_lib::LittleEndian2Int(substr($SWFfileData$CurrentOffset4));
                
$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;
    }

}


?>