5 views 
Syntax Syntax
Parameters Parameters
- $asf_header_extension_object_data
-
(Required)
- $unhandled_sections
-
(Required)
Return Return
(array)
Source Source
File: wp-includes/ID3/module.audio-video.asf.php
*
* @return array
*/
public function HeaderExtensionObjectDataParse(&$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'];