getid3_asf::HeaderExtensionObjectDataParse

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Syntax Syntax

getid3_asf::HeaderExtensionObjectDataParse( string $asf_header_extension_object_data, int $unhandled_sections )

Parameters Parameters

$asf_header_extension_object_data

(string) (Required)

$unhandled_sections

(int) (Required)

Return Return

(array)

Source Source

File: wp-includes/ID3/module.audio-video.asf.php

	 *
	 * @return array
	 */
	public function HeaderExtensionObjectDataParse(&$asf_header_extension_object_data, &$unhandled_sections) {
		// http://msdn.microsoft.com/en-us/library/bb643323.aspx

		$offset = 0;
		$objectOffset = 0;
		$HeaderExtensionObjectParsed = array();
		while ($objectOffset < strlen($asf_header_extension_object_data)) {
			$offset = $objectOffset;
			$thisObject = array();

			$thisObject['guid']                              =                              substr($asf_header_extension_object_data, $offset, 16);
			$offset += 16;
			$thisObject['guid_text'] = $this->BytestringToGUID($thisObject['guid']);
			$thisObject['guid_name'] = $this->GUIDname($thisObject['guid_text']);

			$thisObject['size']                              = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  8));
			$offset += 8;
			if ($thisObject['size'] <= 0) {
				break;
			}

			switch ($thisObject['guid']) {
				case GETID3_ASF_Extended_Stream_Properties_Object:
					$thisObject['start_time']                        = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  8));
					$offset += 8;
					$thisObject['start_time_unix']                   = $this->FILETIMEtoUNIXtime($thisObject['start_time']);

					$thisObject['end_time']                          = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  8));
					$offset += 8;
					$thisObject['end_time_unix']                     = $this->FILETIMEtoUNIXtime($thisObject['end_time']);

					$thisObject['data_bitrate']                      = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['buffer_size']                       = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['initial_buffer_fullness']           = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['alternate_data_bitrate']            = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['alternate_buffer_size']             = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['alternate_initial_buffer_fullness'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['maximum_object_size']               = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['flags_raw']                         = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;
					$thisObject['flags']['reliable']                = (bool) $thisObject['flags_raw'] & 0x00000001;
					$thisObject['flags']['seekable']                = (bool) $thisObject['flags_raw'] & 0x00000002;
					$thisObject['flags']['no_cleanpoints']          = (bool) $thisObject['flags_raw'] & 0x00000004;
					$thisObject['flags']['resend_live_cleanpoints'] = (bool) $thisObject['flags_raw'] & 0x00000008;

					$thisObject['stream_number']                     = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					$thisObject['stream_language_id_index']          = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					$thisObject['average_time_per_frame']            = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
					$offset += 4;

					$thisObject['stream_name_count']                 = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					$thisObject['payload_extension_system_count']    = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					for ($i = 0; $i < $thisObject['stream_name_count']; $i++) {
						$streamName = array();

						$streamName['language_id_index']             = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$streamName['stream_name_length']            = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$streamName['stream_name']                   = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  $streamName['stream_name_length']));
						$offset += $streamName['stream_name_length'];

						$thisObject['stream_names'][$i] = $streamName;
					}

					for ($i = 0; $i < $thisObject['payload_extension_system_count']; $i++) {
						$payloadExtensionSystem = array();

						$payloadExtensionSystem['extension_system_id']   =                              substr($asf_header_extension_object_data, $offset, 16);
						$offset += 16;
						$payloadExtensionSystem['extension_system_id_text'] = $this->BytestringToGUID($payloadExtensionSystem['extension_system_id']);

						$payloadExtensionSystem['extension_system_size'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;
						if ($payloadExtensionSystem['extension_system_size'] <= 0) {
							break 2;
						}

						$payloadExtensionSystem['extension_system_info_length'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
						$offset += 4;

						$payloadExtensionSystem['extension_system_info_length'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  $payloadExtensionSystem['extension_system_info_length']));
						$offset += $payloadExtensionSystem['extension_system_info_length'];

						$thisObject['payload_extension_systems'][$i] = $payloadExtensionSystem;
					}

					break;

				case GETID3_ASF_Padding_Object:
					// padding, skip it
					break;

				case GETID3_ASF_Metadata_Object:
					$thisObject['description_record_counts'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					for ($i = 0; $i < $thisObject['description_record_counts']; $i++) {
						$descriptionRecord = array();

						$descriptionRecord['reserved_1']         = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2)); // must be zero
						$offset += 2;

						$descriptionRecord['stream_number']      = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$descriptionRecord['name_length']        = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$descriptionRecord['data_type']          = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;
						$descriptionRecord['data_type_text'] = self::metadataLibraryObjectDataTypeLookup($descriptionRecord['data_type']);

						$descriptionRecord['data_length']        = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
						$offset += 4;

						$descriptionRecord['name']               =                              substr($asf_header_extension_object_data, $offset,  $descriptionRecord['name_length']);
						$offset += $descriptionRecord['name_length'];

						$descriptionRecord['data']               =                              substr($asf_header_extension_object_data, $offset,  $descriptionRecord['data_length']);
						$offset += $descriptionRecord['data_length'];
						switch ($descriptionRecord['data_type']) {
							case 0x0000: // Unicode string
								break;

							case 0x0001: // BYTE array
								// do nothing
								break;

							case 0x0002: // BOOL
								$descriptionRecord['data'] = (bool) getid3_lib::LittleEndian2Int($descriptionRecord['data']);
								break;

							case 0x0003: // DWORD
							case 0x0004: // QWORD
							case 0x0005: // WORD
								$descriptionRecord['data'] = getid3_lib::LittleEndian2Int($descriptionRecord['data']);
								break;

							case 0x0006: // GUID
								$descriptionRecord['data_text'] = $this->BytestringToGUID($descriptionRecord['data']);
								break;
						}

						$thisObject['description_record'][$i] = $descriptionRecord;
					}
					break;

				case GETID3_ASF_Language_List_Object:
					$thisObject['language_id_record_counts'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					for ($i = 0; $i < $thisObject['language_id_record_counts']; $i++) {
						$languageIDrecord = array();

						$languageIDrecord['language_id_length']         = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  1));
						$offset += 1;

						$languageIDrecord['language_id']                =                              substr($asf_header_extension_object_data, $offset,  $languageIDrecord['language_id_length']);
						$offset += $languageIDrecord['language_id_length'];

						$thisObject['language_id_record'][$i] = $languageIDrecord;
					}
					break;

				case GETID3_ASF_Metadata_Library_Object:
					$thisObject['description_records_count'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
					$offset += 2;

					for ($i = 0; $i < $thisObject['description_records_count']; $i++) {
						$descriptionRecord = array();

						$descriptionRecord['language_list_index'] = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$descriptionRecord['stream_number']       = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$descriptionRecord['name_length']         = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;

						$descriptionRecord['data_type']           = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  2));
						$offset += 2;
						$descriptionRecord['data_type_text'] = self::metadataLibraryObjectDataTypeLookup($descriptionRecord['data_type']);

						$descriptionRecord['data_length']         = getid3_lib::LittleEndian2Int(substr($asf_header_extension_object_data, $offset,  4));
						$offset += 4;

						$descriptionRecord['name']                =                              substr($asf_header_extension_object_data, $offset,  $descriptionRecord['name_length']);
						$offset += $descriptionRecord['name_length'];

						$descriptionRecord['data']                =                              substr($asf_header_extension_object_data, $offset,  $descriptionRecord['data_length']);
						$offset += $descriptionRecord['data_length'];

						if (preg_match('#^WM/Picture$#', str_replace("\x00", '', trim($descriptionRecord['name'])))) {
							$WMpicture = $this->ASF_WMpicture($descriptionRecord['data']);
							foreach ($WMpicture as $key => $value) {
								$descriptionRecord['data'] = $WMpicture;
							}
							unset($WMpicture);
						}

						$thisObject['description_record'][$i] = $descriptionRecord;
					}
					break;

				default:
					$unhandled_sections++;
					if ($this->GUIDname($thisObject['guid_text'])) {
						$this->warning('unhandled Header Extension Object GUID "'.$this->GUIDname($thisObject['guid_text']).'" {'.$thisObject['guid_text'].'} at offset '.($offset - 16 - 8));
					} else {
						$this->warning('unknown Header Extension Object GUID {'.$thisObject['guid_text'].'} in at offset '.($offset - 16 - 8));
					}
					break;
			}
			$HeaderExtensionObjectParsed[] = $thisObject;

			$objectOffset += $thisObject['size'];

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