Location: PHPKode > projects > The cool MP3 database of the future > include/getid3/getid3.matroska.php
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <hide@address.com>               //
//  available at http://getid3.sourceforge.net                ///
//            or http://www.getid3.org                        ///
/////////////////////////////////////////////////////////////////
//                                                             //
// getid3.matroska.php - part of getID3()                      //
// See getid3.readme.txt for more details                      //
//                                                             //
/////////////////////////////////////////////////////////////////

function getMatroskaHeaderFilepointer(&$fd, &$ThisFileInfo) {

	$ThisFileInfo['fileformat'] = 'matroska';

	fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);

	//$ThisFileInfo['matroska']['raw']['a'] = EBML2Int(fread($fd, 4));

	$ThisFileInfo['error'] .= "\n".'Mastroka parsing not enabled in this version of getID3()';
	return false;

}

function EBML2Int($EBMLstring) {
	// http://matroska.org/specs/

	// Element ID coded with an UTF-8 like system:
	// 1xxx xxxx                                  - Class A IDs (2^7 -2 possible values) (base 0x8X)
	// 01xx xxxx  xxxx xxxx                       - Class B IDs (2^14-2 possible values) (base 0x4X 0xXX)
	// 001x xxxx  xxxx xxxx  xxxx xxxx            - Class C IDs (2^21-2 possible values) (base 0x2X 0xXX 0xXX)
	// 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - Class D IDs (2^28-2 possible values) (base 0x1X 0xXX 0xXX 0xXX)
	// Values with all x at 0 and 1 are reserved (hence the -2).

	// Data size, in octets, is also coded with an UTF-8 like system :
	// 1xxx xxxx                                                                              - value 0 to  2^7-2
	// 01xx xxxx  xxxx xxxx                                                                   - value 0 to 2^14-2
	// 001x xxxx  xxxx xxxx  xxxx xxxx                                                        - value 0 to 2^21-2
	// 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                             - value 0 to 2^28-2
	// 0000 1xxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                  - value 0 to 2^35-2
	// 0000 01xx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                       - value 0 to 2^42-2
	// 0000 001x  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx            - value 0 to 2^49-2
	// 0000 0001  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - value 0 to 2^56-2

	if (0x80 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x7F);
	} elseif (0x40 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x3F);
	} elseif (0x20 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x1F);
	} elseif (0x10 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x0F);
	} elseif (0x08 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x07);
	} elseif (0x04 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x03);
	} elseif (0x02 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x01);
	} elseif (0x01 & ord($EBMLstring{0})) {
		$EBMLstring{0} = chr(ord($EBMLstring{0}) & 0x00);
	} else {
		return false;
	}
	return BigEndian2Int($EBMLstring);
}

?>
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