getid3_asf

21class getid3_asf extends getid3_handler22{23	protected static $ASFIndexParametersObjectIndexSpecifiersIndexTypes = array(24		1 => 'Nearest Past Data Packet',25		2 => 'Nearest Past Media Object',26		3 => 'Nearest Past Cleanpoint'27	);28 29	protected static $ASFMediaObjectIndexParametersObjectIndexSpecifiersIndexTypes = array(30		1 => 'Nearest Past Data Packet',31		2 => 'Nearest Past Media Object',32		3 => 'Nearest Past Cleanpoint',33		0xFF => 'Frame Number Offset'34	);35 36	protected static $ASFTimecodeIndexParametersObjectIndexSpecifiersIndexTypes = array(37		2 => 'Nearest Past Media Object',38		3 => 'Nearest Past Cleanpoint'39	);40 41	/**42	 * @param getID3 $getid343	 */44	public function __construct(getID3 $getid3) {45		parent::__construct($getid3);  // extends getid3_handler::__construct()46 47		// initialize all GUID constants48		$GUIDarray = $this->KnownGUIDs();49		foreach ($GUIDarray as $GUIDname => $hexstringvalue) {50			if (!defined($GUIDname)) {51				define($GUIDname, $this->GUIDtoBytestring($hexstringvalue));52			}53		}54	}55 56	/**57	 * @return bool58	 */59	public function Analyze() {60		$info = &$this->getid3->info;61 62		// Shortcuts63		$thisfile_audio = &$info['audio'];64		$thisfile_video = &$info['video'];65		$info['asf']  = array();66		$thisfile_asf = &$info['asf'];67		$thisfile_asf['comments'] = array();68		$thisfile_asf_comments    = &$thisfile_asf['comments'];69		$thisfile_asf['header_object'] = array();70		$thisfile_asf_headerobject     = &$thisfile_asf['header_object'];71 72 73		// ASF structure:74		// * Header Object [required]75		//   * File Properties Object [required]   (global file attributes)76		//   * Stream Properties Object [required] (defines media stream & characteristics)77		//   * Header Extension Object [required]  (additional functionality)78		//   * Content Description Object          (bibliographic information)79		//   * Script Command Object               (commands for during playback)80		//   * Marker Object                       (named jumped points within the file)81		// * Data Object [required]82		//   * Data Packets83		// * Index Object84 85		// Header Object: (mandatory, one only)86		// Field Name                   Field Type   Size (bits)87		// Object ID                    GUID         128             // GUID for header object - GETID3_ASF_Header_Object88		// Object Size                  QWORD        64              // size of header object, including 30 bytes of Header Object header89		// Number of Header Objects     DWORD        32              // number of objects in header object90		// Reserved1                    BYTE         8               // hardcoded: 0x0191		// Reserved2                    BYTE         8               // hardcoded: 0x0292 93		$info['fileformat'] = 'asf';94 95		$this->fseek($info['avdataoffset']);96		$HeaderObjectData = $this->fread(30);97 98		$thisfile_asf_headerobject['objectid']      = substr($HeaderObjectData, 0, 16);99		$thisfile_asf_headerobject['objectid_guid'] = $this->BytestringToGUID($thisfile_asf_headerobject['objectid']);100		if ($thisfile_asf_headerobject['objectid'] != GETID3_ASF_Header_Object) {