GetId3\Module\AudioVideo\Swf Class Reference

GetId3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //. More...

Inheritance diagram for GetId3\Module\AudioVideo\Swf:

Collaboration diagram for GetId3\Module\AudioVideo\Swf:

Public Member Functions
	analyze ()
Public Member Functions inherited from GetId3\Handler\BaseHandler
	__construct (GetId3Core $getid3, $call_module=null)
	analyze ()
	Analyze from file pointer. More...
	AnalyzeString (&$string)
	Analyze from string instead. More...
	saveAttachment (&$ThisFileInfoIndex, $filename, $offset, $length)

Data Fields
	$ReturnAllTagData = false

Additional Inherited Members
Protected Member Functions inherited from GetId3\Handler\BaseHandler
	ftell ()
	fread ($bytes)
	fseek ($bytes, $whence=SEEK_SET)
	feof ()
	isDependencyFor ($module)
	error ($text)
	warning ($text)
Protected Attributes inherited from GetId3\Handler\BaseHandler
	$getid3
	$data_string_flag = false
	$data_string = ''
	$data_string_position = 0
	$data_string_length = 0

Detailed Description

GetId3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //.

module for analyzing Shockwave Flash files

Author

James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g http://www.getid3.org

Definition at line 29 of file Swf.php.

Member Function Documentation

analyze()

GetId3\Module\AudioVideo\Swf::analyze

(

)

Returns

boolean

Reimplemented from GetId3\Handler\BaseHandler.

Definition at line 41 of file Swf.php.

    {
        $info = &$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 "'.Helper::PrintHexBytes($info['swf']['header']['signature']).'"';
                unset($info['swf']);
                unset($info['fileformat']);
 
                return false;
                break;
        }
        $info['swf']['header']['version'] = Helper::LittleEndian2Int(substr($SWFfileData, 3, 1));
        $info['swf']['header']['length']  = Helper::LittleEndian2Int(substr($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));
        $info['swf']['header']['frame_width']  = Helper::Bin2Dec($X2);
        $info['swf']['header']['frame_height'] = Helper::Bin2Dec($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
        $info['swf']['header']['frame_rate']  = Helper::LittleEndian2Int(substr($SWFfileData,  9 + $FrameSizeDataLength, 1));
        $info['swf']['header']['frame_count'] = Helper::LittleEndian2Int(substr($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>';
 
            $TagIDTagLength = Helper::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
            $TagID     = ($TagIDTagLength & 0xFFFC) >> 6;
            $TagLength = ($TagIDTagLength & 0x003F);
            $CurrentOffset += 2;
            if ($TagLength == 0x3F) {
                $TagLength = Helper::LittleEndian2Int(substr($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;
                    $info['swf']['bgcolor'] = strtoupper(str_pad(dechex(Helper::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
                    break;
 
                default:
                    if ($this->ReturnAllTagData) {
                        $info['swf']['tags'][] = $TagData;
                    }
                    break;
            }
 
            $CurrentOffset += $TagLength;
        }
 
        return true;
    }

References $info, GetId3\Lib\Helper\BigEndian2Int(), GetId3\Lib\Helper\Bin2Dec(), GetId3\Handler\BaseHandler\fread(), GetId3\Handler\BaseHandler\fseek(), GetId3\Lib\Helper\LittleEndian2Int(), and GetId3\Lib\Helper\PrintHexBytes().

Here is the call graph for this function:

Field Documentation

$ReturnAllTagData

GetId3\Module\AudioVideo\Swf::$ReturnAllTagData = false

Definition at line 35 of file Swf.php.

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The documentation for this class was generated from the following file:

• libs/composer/vendor/phansys/getid3/GetId3/Module/AudioVideo/Swf.php