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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

       
$info['swf']['header']['signature'] = substr($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;
    }

}


?>