getid3_asf::Analyze(): bool

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 ($thisfile_asf_headerobject['objectid'] != GETID3_ASF_Header_Object) {101			unset($info['fileformat'], $info['asf']);102			return $this->error('ASF header GUID {'.$this->BytestringToGUID($thisfile_asf_headerobject['objectid']).'} does not match expected "GETID3_ASF_Header_Object" GUID {'.$this->BytestringToGUID(GETID3_ASF_Header_Object).'}');103		}104		$thisfile_asf_headerobject['objectsize']    = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 16, 8));105		$thisfile_asf_headerobject['headerobjects'] = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 24, 4));106		$thisfile_asf_headerobject['reserved1']     = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 28, 1));107		$thisfile_asf_headerobject['reserved2']     = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 29, 1));108 109		$NextObjectOffset = $this->ftell();110		$ASFHeaderData = $this->fread($thisfile_asf_headerobject['objectsize'] - 30);111		$offset = 0;112		$thisfile_asf_streambitratepropertiesobject = array();113		$thisfile_asf_codeclistobject = array();114		$StreamPropertiesObjectData = array();115 116		for ($HeaderObjectsCounter = 0; $HeaderObjectsCounter < $thisfile_asf_headerobject['headerobjects']; $HeaderObjectsCounter++) {117			$NextObjectGUID = substr($ASFHeaderData, $offset, 16);118			$offset += 16;119			$NextObjectGUIDtext = $this->BytestringToGUID($NextObjectGUID);120			$NextObjectSize = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 8));121			$offset += 8;122			switch ($NextObjectGUID) {123 124				case GETID3_ASF_File_Properties_Object:125					// File Properties Object: (mandatory, one only)126					// Field Name                   Field Type   Size (bits)127					// Object ID                    GUID         128             // GUID for file properties object - GETID3_ASF_File_Properties_Object128					// Object Size                  QWORD        64              // size of file properties object, including 104 bytes of File Properties Object header129					// File ID                      GUID         128             // unique ID - identical to File ID in Data Object130					// File Size                    QWORD        64              // entire file in bytes. Invalid if Broadcast Flag == 1131					// Creation Date                QWORD        64              // date & time of file creation. Maybe invalid if Broadcast Flag == 1132					// Data Packets Count           QWORD        64              // number of data packets in Data Object. Invalid if Broadcast Flag == 1133					// Play Duration                QWORD        64              // playtime, in 100-nanosecond units. Invalid if Broadcast Flag == 1134					// Send Duration                QWORD        64              // time needed to send file, in 100-nanosecond units. Players can ignore this value. Invalid if Broadcast Flag == 1135					// Preroll                      QWORD        64              // time to buffer data before starting to play file, in 1-millisecond units. If <> 0, PlayDuration and PresentationTime have been offset by this amount136					// Flags                        DWORD        32              //137					// * Broadcast Flag             bits         1  (0x01)       // file is currently being written, some header values are invalid138					// * Seekable Flag              bits         1  (0x02)       // is file seekable