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класс не описан

getid3_matroska{} WP 1.0

Хуков нет.

Возвращает

Null. Ничего.

Использование

$getid3_matroska = new getid3_matroska();
// use class methods

Методы

  1. Analyze()
  2. BlockLacingType($lacingtype)
  3. CodecIDtoCommonName($codecid)
  4. displayUnit($value)
  5. EBML2Int($EBMLstring)
  6. EBMLdate2unix($EBMLdatestamp)
  7. EBMLidName($value)
  8. EnsureBufferHasEnoughData($min_data=1024)
  9. ExtractCommentsSimpleTag($SimpleTagArray)
  10. getDefaultStreamInfo($streams)
  11. getEBMLelement(&$element, $parent_end, $get_data=false)
  12. HandleEMBLClusterBlock($element, $block_type, &$info)
  13. HandleEMBLSimpleTag($parent_end)
  14. parseEBML(&$info)
  15. readEBMLelementData($length, $check_buffer=false)
  16. readEBMLint()
  17. TargetTypeValue($target_type)
  18. unhandledElement($type, $line, $element)

Код getid3 matroska: wp-includes/ID3/module.audio-video.matroska.php WP 5.2.2

<?php
class getid3_matroska extends getid3_handler
{
	// public options
	public static $hide_clusters    = true;  // if true, do not return information about CLUSTER chunks, since there's a lot of them and they're not usually useful [default: TRUE]
	public static $parse_whole_file = false; // true to parse the whole file, not only header [default: FALSE]

	// private parser settings/placeholders
	private $EBMLbuffer        = '';
	private $EBMLbuffer_offset = 0;
	private $EBMLbuffer_length = 0;
	private $current_offset    = 0;
	private $unuseful_elements = array(EBML_ID_CRC32, EBML_ID_VOID);

	public function Analyze()
	{
		$info = &$this->getid3->info;

		// parse container
		try {
			$this->parseEBML($info);
		} catch (Exception $e) {
			$this->error('EBML parser: '.$e->getMessage());
		}

		// calculate playtime
		if (isset($info['matroska']['info']) && is_array($info['matroska']['info'])) {
			foreach ($info['matroska']['info'] as $key => $infoarray) {
				if (isset($infoarray['Duration'])) {
					// TimecodeScale is how many nanoseconds each Duration unit is
					$info['playtime_seconds'] = $infoarray['Duration'] * ((isset($infoarray['TimecodeScale']) ? $infoarray['TimecodeScale'] : 1000000) / 1000000000);
					break;
				}
			}
		}

		// extract tags
		if (isset($info['matroska']['tags']) && is_array($info['matroska']['tags'])) {
			foreach ($info['matroska']['tags'] as $key => $infoarray) {
				$this->ExtractCommentsSimpleTag($infoarray);
			}
		}

		// process tracks
		if (isset($info['matroska']['tracks']['tracks']) && is_array($info['matroska']['tracks']['tracks'])) {
			foreach ($info['matroska']['tracks']['tracks'] as $key => $trackarray) {

				$track_info = array();
				$track_info['dataformat'] = self::CodecIDtoCommonName($trackarray['CodecID']);
				$track_info['default'] = (isset($trackarray['FlagDefault']) ? $trackarray['FlagDefault'] : true);
				if (isset($trackarray['Name'])) { $track_info['name'] = $trackarray['Name']; }

				switch ($trackarray['TrackType']) {

					case 1: // Video
						$track_info['resolution_x'] = $trackarray['PixelWidth'];
						$track_info['resolution_y'] = $trackarray['PixelHeight'];
						$track_info['display_unit'] = self::displayUnit(isset($trackarray['DisplayUnit']) ? $trackarray['DisplayUnit'] : 0);
						$track_info['display_x']    = (isset($trackarray['DisplayWidth']) ? $trackarray['DisplayWidth'] : $trackarray['PixelWidth']);
						$track_info['display_y']    = (isset($trackarray['DisplayHeight']) ? $trackarray['DisplayHeight'] : $trackarray['PixelHeight']);

						if (isset($trackarray['PixelCropBottom'])) { $track_info['crop_bottom'] = $trackarray['PixelCropBottom']; }
						if (isset($trackarray['PixelCropTop']))    { $track_info['crop_top']    = $trackarray['PixelCropTop']; }
						if (isset($trackarray['PixelCropLeft']))   { $track_info['crop_left']   = $trackarray['PixelCropLeft']; }
						if (isset($trackarray['PixelCropRight']))  { $track_info['crop_right']  = $trackarray['PixelCropRight']; }
						if (isset($trackarray['DefaultDuration'])) { $track_info['frame_rate']  = round(1000000000 / $trackarray['DefaultDuration'], 3); }
						if (isset($trackarray['CodecName']))       { $track_info['codec']       = $trackarray['CodecName']; }

						switch ($trackarray['CodecID']) {
							case 'V_MS/VFW/FOURCC':
								getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);

								$parsed = getid3_riff::ParseBITMAPINFOHEADER($trackarray['CodecPrivate']);
								$track_info['codec'] = getid3_riff::fourccLookup($parsed['fourcc']);
								$info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $parsed;
								break;

							/*case 'V_MPEG4/ISO/AVC':
								$h264['profile']    = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 1, 1));
								$h264['level']      = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 3, 1));
								$rn                 = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 4, 1));
								$h264['NALUlength'] = ($rn & 3) + 1;
								$rn                 = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 5, 1));
								$nsps               = ($rn & 31);
								$offset             = 6;
								for ($i = 0; $i < $nsps; $i ++) {
									$length        = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 2));
									$h264['SPS'][] = substr($trackarray['CodecPrivate'], $offset + 2, $length);
									$offset       += 2 + $length;
								}
								$npps               = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 1));
								$offset            += 1;
								for ($i = 0; $i < $npps; $i ++) {
									$length        = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 2));
									$h264['PPS'][] = substr($trackarray['CodecPrivate'], $offset + 2, $length);
									$offset       += 2 + $length;
								}
								$info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $h264;
								break;*/
						}

						$info['video']['streams'][] = $track_info;
						break;

					case 2: // Audio
						$track_info['sample_rate'] = (isset($trackarray['SamplingFrequency']) ? $trackarray['SamplingFrequency'] : 8000.0);
						$track_info['channels']    = (isset($trackarray['Channels']) ? $trackarray['Channels'] : 1);
						$track_info['language']    = (isset($trackarray['Language']) ? $trackarray['Language'] : 'eng');
						if (isset($trackarray['BitDepth']))  { $track_info['bits_per_sample'] = $trackarray['BitDepth']; }
						if (isset($trackarray['CodecName'])) { $track_info['codec']           = $trackarray['CodecName']; }

						switch ($trackarray['CodecID']) {
							case 'A_PCM/INT/LIT':
							case 'A_PCM/INT/BIG':
								$track_info['bitrate'] = $trackarray['SamplingFrequency'] * $trackarray['Channels'] * $trackarray['BitDepth'];
								break;

							case 'A_AC3':
							case 'A_EAC3':
							case 'A_DTS':
							case 'A_MPEG/L3':
							case 'A_MPEG/L2':
							case 'A_FLAC':
								$module_dataformat = ($track_info['dataformat'] == 'mp2' ? 'mp3' : ($track_info['dataformat'] == 'eac3' ? 'ac3' : $track_info['dataformat']));
								getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.'.$module_dataformat.'.php', __FILE__, true);

								if (!isset($info['matroska']['track_data_offsets'][$trackarray['TrackNumber']])) {
									$this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because $info[matroska][track_data_offsets]['.$trackarray['TrackNumber'].'] not set');
									break;
								}

								// create temp instance
								$getid3_temp = new getID3();
								if ($track_info['dataformat'] != 'flac') {
									$getid3_temp->openfile($this->getid3->filename);
								}
								$getid3_temp->info['avdataoffset'] = $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['offset'];
								if ($track_info['dataformat'][0] == 'm' || $track_info['dataformat'] == 'flac') {
									$getid3_temp->info['avdataend'] = $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['offset'] + $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['length'];
								}

								// analyze
								$class = 'getid3_'.$module_dataformat;
								$header_data_key = $track_info['dataformat'][0] == 'm' ? 'mpeg' : $track_info['dataformat'];
								$getid3_audio = new $class($getid3_temp, __CLASS__);
								if ($track_info['dataformat'] == 'flac') {
									$getid3_audio->AnalyzeString($trackarray['CodecPrivate']);
								}
								else {
									$getid3_audio->Analyze();
								}
								if (!empty($getid3_temp->info[$header_data_key])) {
									$info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $getid3_temp->info[$header_data_key];
									if (isset($getid3_temp->info['audio']) && is_array($getid3_temp->info['audio'])) {
										foreach ($getid3_temp->info['audio'] as $key => $value) {
											$track_info[$key] = $value;
										}
									}
								}
								else {
									$this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because '.$class.'::Analyze() failed at offset '.$getid3_temp->info['avdataoffset']);
								}

								// copy errors and warnings
								if (!empty($getid3_temp->info['error'])) {
									foreach ($getid3_temp->info['error'] as $newerror) {
										$this->warning($class.'() says: ['.$newerror.']');
									}
								}
								if (!empty($getid3_temp->info['warning'])) {
									foreach ($getid3_temp->info['warning'] as $newerror) {
										$this->warning($class.'() says: ['.$newerror.']');
									}
								}
								unset($getid3_temp, $getid3_audio);
								break;

							case 'A_AAC':
							case 'A_AAC/MPEG2/LC':
							case 'A_AAC/MPEG2/LC/SBR':
							case 'A_AAC/MPEG4/LC':
							case 'A_AAC/MPEG4/LC/SBR':
								$this->warning($trackarray['CodecID'].' audio data contains no header, audio/video bitrates can\'t be calculated');
								break;

							case 'A_VORBIS':
								if (!isset($trackarray['CodecPrivate'])) {
									$this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because CodecPrivate data not set');
									break;
								}
								$vorbis_offset = strpos($trackarray['CodecPrivate'], 'vorbis', 1);
								if ($vorbis_offset === false) {
									$this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because CodecPrivate data does not contain "vorbis" keyword');
									break;
								}
								$vorbis_offset -= 1;

								getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);

								// create temp instance
								$getid3_temp = new getID3();

								// analyze
								$getid3_ogg = new getid3_ogg($getid3_temp);
								$oggpageinfo['page_seqno'] = 0;
								$getid3_ogg->ParseVorbisPageHeader($trackarray['CodecPrivate'], $vorbis_offset, $oggpageinfo);
								if (!empty($getid3_temp->info['ogg'])) {
									$info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $getid3_temp->info['ogg'];
									if (isset($getid3_temp->info['audio']) && is_array($getid3_temp->info['audio'])) {
										foreach ($getid3_temp->info['audio'] as $key => $value) {
											$track_info[$key] = $value;
										}
									}
								}

								// copy errors and warnings
								if (!empty($getid3_temp->info['error'])) {
									foreach ($getid3_temp->info['error'] as $newerror) {
										$this->warning('getid3_ogg() says: ['.$newerror.']');
									}
								}
								if (!empty($getid3_temp->info['warning'])) {
									foreach ($getid3_temp->info['warning'] as $newerror) {
										$this->warning('getid3_ogg() says: ['.$newerror.']');
									}
								}

								if (!empty($getid3_temp->info['ogg']['bitrate_nominal'])) {
									$track_info['bitrate'] = $getid3_temp->info['ogg']['bitrate_nominal'];
								}
								unset($getid3_temp, $getid3_ogg, $oggpageinfo, $vorbis_offset);
								break;

							case 'A_MS/ACM':
								getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);

								$parsed = getid3_riff::parseWAVEFORMATex($trackarray['CodecPrivate']);
								foreach ($parsed as $key => $value) {
									if ($key != 'raw') {
										$track_info[$key] = $value;
									}
								}
								$info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $parsed;
								break;

							default:
								$this->warning('Unhandled audio type "'.(isset($trackarray['CodecID']) ? $trackarray['CodecID'] : '').'"');
								break;
						}

						$info['audio']['streams'][] = $track_info;
						break;
				}
			}

			if (!empty($info['video']['streams'])) {
				$info['video'] = self::getDefaultStreamInfo($info['video']['streams']);
			}
			if (!empty($info['audio']['streams'])) {
				$info['audio'] = self::getDefaultStreamInfo($info['audio']['streams']);
			}
		}

		// process attachments
		if (isset($info['matroska']['attachments']) && $this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE) {
			foreach ($info['matroska']['attachments'] as $i => $entry) {
				if (strpos($entry['FileMimeType'], 'image/') === 0 && !empty($entry['FileData'])) {
					$info['matroska']['comments']['picture'][] = array('data' => $entry['FileData'], 'image_mime' => $entry['FileMimeType'], 'filename' => $entry['FileName']);
				}
			}
		}

		// determine mime type
		if (!empty($info['video']['streams'])) {
			$info['mime_type'] = ($info['matroska']['doctype'] == 'webm' ? 'video/webm' : 'video/x-matroska');
		} elseif (!empty($info['audio']['streams'])) {
			$info['mime_type'] = ($info['matroska']['doctype'] == 'webm' ? 'audio/webm' : 'audio/x-matroska');
		} elseif (isset($info['mime_type'])) {
			unset($info['mime_type']);
		}

		return true;
	}

	private function parseEBML(&$info) {
		// http://www.matroska.org/technical/specs/index.html#EBMLBasics
		$this->current_offset = $info['avdataoffset'];

		while ($this->getEBMLelement($top_element, $info['avdataend'])) {
			switch ($top_element['id']) {

				case EBML_ID_EBML:
					$info['matroska']['header']['offset'] = $top_element['offset'];
					$info['matroska']['header']['length'] = $top_element['length'];

					while ($this->getEBMLelement($element_data, $top_element['end'], true)) {
						switch ($element_data['id']) {

							case EBML_ID_EBMLVERSION:
							case EBML_ID_EBMLREADVERSION:
							case EBML_ID_EBMLMAXIDLENGTH:
							case EBML_ID_EBMLMAXSIZELENGTH:
							case EBML_ID_DOCTYPEVERSION:
							case EBML_ID_DOCTYPEREADVERSION:
								$element_data['data'] = getid3_lib::BigEndian2Int($element_data['data']);
								break;

							case EBML_ID_DOCTYPE:
								$element_data['data'] = getid3_lib::trimNullByte($element_data['data']);
								$info['matroska']['doctype'] = $element_data['data'];
								$info['fileformat'] = $element_data['data'];
								break;

							default:
								$this->unhandledElement('header', __LINE__, $element_data);
								break;
						}

						unset($element_data['offset'], $element_data['end']);
						$info['matroska']['header']['elements'][] = $element_data;
					}
					break;

				case EBML_ID_SEGMENT:
					$info['matroska']['segment'][0]['offset'] = $top_element['offset'];
					$info['matroska']['segment'][0]['length'] = $top_element['length'];

					while ($this->getEBMLelement($element_data, $top_element['end'])) {
						if ($element_data['id'] != EBML_ID_CLUSTER || !self::$hide_clusters) { // collect clusters only if required
							$info['matroska']['segments'][] = $element_data;
						}
						switch ($element_data['id']) {

							case EBML_ID_SEEKHEAD: // Contains the position of other level 1 elements.

								while ($this->getEBMLelement($seek_entry, $element_data['end'])) {
									switch ($seek_entry['id']) {

										case EBML_ID_SEEK: // Contains a single seek entry to an EBML element
											while ($this->getEBMLelement($sub_seek_entry, $seek_entry['end'], true)) {

												switch ($sub_seek_entry['id']) {

													case EBML_ID_SEEKID:
														$seek_entry['target_id']   = self::EBML2Int($sub_seek_entry['data']);
														$seek_entry['target_name'] = self::EBMLidName($seek_entry['target_id']);
														break;

													case EBML_ID_SEEKPOSITION:
														$seek_entry['target_offset'] = $element_data['offset'] + getid3_lib::BigEndian2Int($sub_seek_entry['data']);
														break;

													default:
														$this->unhandledElement('seekhead.seek', __LINE__, $sub_seek_entry);												}
														break;
											}
											if (!isset($seek_entry['target_id'])) {
												$this->warning('seek_entry[target_id] unexpectedly not set at '.$seek_entry['offset']);
												break;
											}
											if (($seek_entry['target_id'] != EBML_ID_CLUSTER) || !self::$hide_clusters) { // collect clusters only if required
												$info['matroska']['seek'][] = $seek_entry;
											}
											break;

										default:
											$this->unhandledElement('seekhead', __LINE__, $seek_entry);
											break;
									}
								}
								break;

							case EBML_ID_TRACKS: // A top-level block of information with many tracks described.
								$info['matroska']['tracks'] = $element_data;

								while ($this->getEBMLelement($track_entry, $element_data['end'])) {
									switch ($track_entry['id']) {

										case EBML_ID_TRACKENTRY: //subelements: Describes a track with all elements.

											while ($this->getEBMLelement($subelement, $track_entry['end'], array(EBML_ID_VIDEO, EBML_ID_AUDIO, EBML_ID_CONTENTENCODINGS, EBML_ID_CODECPRIVATE))) {
												switch ($subelement['id']) {

													case EBML_ID_TRACKNUMBER:
													case EBML_ID_TRACKUID:
													case EBML_ID_TRACKTYPE:
													case EBML_ID_MINCACHE:
													case EBML_ID_MAXCACHE:
													case EBML_ID_MAXBLOCKADDITIONID:
													case EBML_ID_DEFAULTDURATION: // nanoseconds per frame
														$track_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
														break;

													case EBML_ID_TRACKTIMECODESCALE:
														$track_entry[$subelement['id_name']] = getid3_lib::BigEndian2Float($subelement['data']);
														break;

													case EBML_ID_CODECID:
													case EBML_ID_LANGUAGE:
													case EBML_ID_NAME:
													case EBML_ID_CODECNAME:
														$track_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
														break;

													case EBML_ID_CODECPRIVATE:
														$track_entry[$subelement['id_name']] = $this->readEBMLelementData($subelement['length'], true);
														break;

													case EBML_ID_FLAGENABLED:
													case EBML_ID_FLAGDEFAULT:
													case EBML_ID_FLAGFORCED:
													case EBML_ID_FLAGLACING:
													case EBML_ID_CODECDECODEALL:
														$track_entry[$subelement['id_name']] = (bool) getid3_lib::BigEndian2Int($subelement['data']);
														break;

													case EBML_ID_VIDEO:

														while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
															switch ($sub_subelement['id']) {

																case EBML_ID_PIXELWIDTH:
																case EBML_ID_PIXELHEIGHT:
																case EBML_ID_PIXELCROPBOTTOM:
																case EBML_ID_PIXELCROPTOP:
																case EBML_ID_PIXELCROPLEFT:
																case EBML_ID_PIXELCROPRIGHT:
																case EBML_ID_DISPLAYWIDTH:
																case EBML_ID_DISPLAYHEIGHT:
																case EBML_ID_DISPLAYUNIT:
																case EBML_ID_ASPECTRATIOTYPE:
																case EBML_ID_STEREOMODE:
																case EBML_ID_OLDSTEREOMODE:
																	$track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
																	break;

																case EBML_ID_FLAGINTERLACED:
																	$track_entry[$sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_subelement['data']);
																	break;

																case EBML_ID_GAMMAVALUE:
																	$track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Float($sub_subelement['data']);
																	break;

																case EBML_ID_COLOURSPACE:
																	$track_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
																	break;

																default:
																	$this->unhandledElement('track.video', __LINE__, $sub_subelement);
																	break;
															}
														}
														break;

													case EBML_ID_AUDIO:

														while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
															switch ($sub_subelement['id']) {

																case EBML_ID_CHANNELS:
																case EBML_ID_BITDEPTH:
																	$track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
																	break;

																case EBML_ID_SAMPLINGFREQUENCY:
																case EBML_ID_OUTPUTSAMPLINGFREQUENCY:
																	$track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Float($sub_subelement['data']);
																	break;

																case EBML_ID_CHANNELPOSITIONS:
																	$track_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
																	break;

																default:
																	$this->unhandledElement('track.audio', __LINE__, $sub_subelement);
																	break;
															}
														}
														break;

													case EBML_ID_CONTENTENCODINGS:

														while ($this->getEBMLelement($sub_subelement, $subelement['end'])) {
															switch ($sub_subelement['id']) {

																case EBML_ID_CONTENTENCODING:

																	while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], array(EBML_ID_CONTENTCOMPRESSION, EBML_ID_CONTENTENCRYPTION))) {
																		switch ($sub_sub_subelement['id']) {

																			case EBML_ID_CONTENTENCODINGORDER:
																			case EBML_ID_CONTENTENCODINGSCOPE:
																			case EBML_ID_CONTENTENCODINGTYPE:
																				$track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
																				break;

																			case EBML_ID_CONTENTCOMPRESSION:

																				while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
																					switch ($sub_sub_sub_subelement['id']) {

																						case EBML_ID_CONTENTCOMPALGO:
																							$track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
																							break;

																						case EBML_ID_CONTENTCOMPSETTINGS:
																							$track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
																							break;

																						default:
																							$this->unhandledElement('track.contentencodings.contentencoding.contentcompression', __LINE__, $sub_sub_sub_subelement);
																							break;
																					}
																				}
																				break;

																			case EBML_ID_CONTENTENCRYPTION:

																				while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
																					switch ($sub_sub_sub_subelement['id']) {

																						case EBML_ID_CONTENTENCALGO:
																						case EBML_ID_CONTENTSIGALGO:
																						case EBML_ID_CONTENTSIGHASHALGO:
																							$track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
																							break;

																						case EBML_ID_CONTENTENCKEYID:
																						case EBML_ID_CONTENTSIGNATURE:
																						case EBML_ID_CONTENTSIGKEYID:
																							$track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
																							break;

																						default:
																							$this->unhandledElement('track.contentencodings.contentencoding.contentcompression', __LINE__, $sub_sub_sub_subelement);
																							break;
																					}
																				}
																				break;

																			default:
																				$this->unhandledElement('track.contentencodings.contentencoding', __LINE__, $sub_sub_subelement);
																				break;
																		}
																	}
																	break;

																default:
																	$this->unhandledElement('track.contentencodings', __LINE__, $sub_subelement);
																	break;
															}
														}
														break;

													default:
														$this->unhandledElement('track', __LINE__, $subelement);
														break;
												}
											}

											$info['matroska']['tracks']['tracks'][] = $track_entry;
											break;

										default:
											$this->unhandledElement('tracks', __LINE__, $track_entry);
											break;
									}
								}
								break;

							case EBML_ID_INFO: // Contains miscellaneous general information and statistics on the file.
								$info_entry = array();

								while ($this->getEBMLelement($subelement, $element_data['end'], true)) {
									switch ($subelement['id']) {

										case EBML_ID_TIMECODESCALE:
											$info_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
											break;

										case EBML_ID_DURATION:
											$info_entry[$subelement['id_name']] = getid3_lib::BigEndian2Float($subelement['data']);
											break;

										case EBML_ID_DATEUTC:
											$info_entry[$subelement['id_name']]         = getid3_lib::BigEndian2Int($subelement['data']);
											$info_entry[$subelement['id_name'].'_unix'] = self::EBMLdate2unix($info_entry[$subelement['id_name']]);
											break;

										case EBML_ID_SEGMENTUID:
										case EBML_ID_PREVUID:
										case EBML_ID_NEXTUID:
											$info_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
											break;

										case EBML_ID_SEGMENTFAMILY:
											$info_entry[$subelement['id_name']][] = getid3_lib::trimNullByte($subelement['data']);
											break;

										case EBML_ID_SEGMENTFILENAME:
										case EBML_ID_PREVFILENAME:
										case EBML_ID_NEXTFILENAME:
										case EBML_ID_TITLE:
										case EBML_ID_MUXINGAPP:
										case EBML_ID_WRITINGAPP:
											$info_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
											$info['matroska']['comments'][strtolower($subelement['id_name'])][] = $info_entry[$subelement['id_name']];
											break;

										case EBML_ID_CHAPTERTRANSLATE:
											$chaptertranslate_entry = array();

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
												switch ($sub_subelement['id']) {

													case EBML_ID_CHAPTERTRANSLATEEDITIONUID:
														$chaptertranslate_entry[$sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													case EBML_ID_CHAPTERTRANSLATECODEC:
														$chaptertranslate_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													case EBML_ID_CHAPTERTRANSLATEID:
														$chaptertranslate_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
														break;

													default:
														$this->unhandledElement('info.chaptertranslate', __LINE__, $sub_subelement);
														break;
												}
											}
											$info_entry[$subelement['id_name']] = $chaptertranslate_entry;
											break;

										default:
											$this->unhandledElement('info', __LINE__, $subelement);
											break;
									}
								}
								$info['matroska']['info'][] = $info_entry;
								break;

							case EBML_ID_CUES: // A top-level element to speed seeking access. All entries are local to the segment. Should be mandatory for non "live" streams.
								if (self::$hide_clusters) { // do not parse cues if hide clusters is "ON" till they point to clusters anyway
									$this->current_offset = $element_data['end'];
									break;
								}
								$cues_entry = array();

								while ($this->getEBMLelement($subelement, $element_data['end'])) {
									switch ($subelement['id']) {

										case EBML_ID_CUEPOINT:
											$cuepoint_entry = array();

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CUETRACKPOSITIONS))) {
												switch ($sub_subelement['id']) {

													case EBML_ID_CUETRACKPOSITIONS:
														$cuetrackpositions_entry = array();

														while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], true)) {
															switch ($sub_sub_subelement['id']) {

																case EBML_ID_CUETRACK:
																case EBML_ID_CUECLUSTERPOSITION:
																case EBML_ID_CUEBLOCKNUMBER:
																case EBML_ID_CUECODECSTATE:
																	$cuetrackpositions_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
																	break;

																default:
																	$this->unhandledElement('cues.cuepoint.cuetrackpositions', __LINE__, $sub_sub_subelement);
																	break;
															}
														}
														$cuepoint_entry[$sub_subelement['id_name']][] = $cuetrackpositions_entry;
														break;

													case EBML_ID_CUETIME:
														$cuepoint_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													default:
														$this->unhandledElement('cues.cuepoint', __LINE__, $sub_subelement);
														break;
												}
											}
											$cues_entry[] = $cuepoint_entry;
											break;

										default:
											$this->unhandledElement('cues', __LINE__, $subelement);
											break;
									}
								}
								$info['matroska']['cues'] = $cues_entry;
								break;

							case EBML_ID_TAGS: // Element containing elements specific to Tracks/Chapters.
								$tags_entry = array();

								while ($this->getEBMLelement($subelement, $element_data['end'], false)) {
									switch ($subelement['id']) {

										case EBML_ID_TAG:
											$tag_entry = array();

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], false)) {
												switch ($sub_subelement['id']) {

													case EBML_ID_TARGETS:
														$targets_entry = array();

														while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], true)) {
															switch ($sub_sub_subelement['id']) {

																case EBML_ID_TARGETTYPEVALUE:
																	$targets_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
																	$targets_entry[strtolower($sub_sub_subelement['id_name']).'_long'] = self::TargetTypeValue($targets_entry[$sub_sub_subelement['id_name']]);
																	break;

																case EBML_ID_TARGETTYPE:
																	$targets_entry[$sub_sub_subelement['id_name']] = $sub_sub_subelement['data'];
																	break;

																case EBML_ID_TAGTRACKUID:
																case EBML_ID_TAGEDITIONUID:
																case EBML_ID_TAGCHAPTERUID:
																case EBML_ID_TAGATTACHMENTUID:
																	$targets_entry[$sub_sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
																	break;

																default:
																	$this->unhandledElement('tags.tag.targets', __LINE__, $sub_sub_subelement);
																	break;
															}
														}
														$tag_entry[$sub_subelement['id_name']] = $targets_entry;
														break;

													case EBML_ID_SIMPLETAG:
														$tag_entry[$sub_subelement['id_name']][] = $this->HandleEMBLSimpleTag($sub_subelement['end']);
														break;

													default:
														$this->unhandledElement('tags.tag', __LINE__, $sub_subelement);
														break;
												}
											}
											$tags_entry[] = $tag_entry;
											break;

										default:
											$this->unhandledElement('tags', __LINE__, $subelement);
											break;
									}
								}
								$info['matroska']['tags'] = $tags_entry;
								break;

							case EBML_ID_ATTACHMENTS: // Contain attached files.

								while ($this->getEBMLelement($subelement, $element_data['end'])) {
									switch ($subelement['id']) {

										case EBML_ID_ATTACHEDFILE:
											$attachedfile_entry = array();

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_FILEDATA))) {
												switch ($sub_subelement['id']) {

													case EBML_ID_FILEDESCRIPTION:
													case EBML_ID_FILENAME:
													case EBML_ID_FILEMIMETYPE:
														$attachedfile_entry[$sub_subelement['id_name']] = $sub_subelement['data'];
														break;

													case EBML_ID_FILEDATA:
														$attachedfile_entry['data_offset'] = $this->current_offset;
														$attachedfile_entry['data_length'] = $sub_subelement['length'];

														$attachedfile_entry[$sub_subelement['id_name']] = $this->saveAttachment(
															$attachedfile_entry['FileName'],
															$attachedfile_entry['data_offset'],
															$attachedfile_entry['data_length']);

														$this->current_offset = $sub_subelement['end'];
														break;

													case EBML_ID_FILEUID:
														$attachedfile_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													default:
														$this->unhandledElement('attachments.attachedfile', __LINE__, $sub_subelement);
														break;
												}
											}
											$info['matroska']['attachments'][] = $attachedfile_entry;
											break;

										default:
											$this->unhandledElement('attachments', __LINE__, $subelement);
											break;
									}
								}
								break;

							case EBML_ID_CHAPTERS:

								while ($this->getEBMLelement($subelement, $element_data['end'])) {
									switch ($subelement['id']) {

										case EBML_ID_EDITIONENTRY:
											$editionentry_entry = array();

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CHAPTERATOM))) {
												switch ($sub_subelement['id']) {

													case EBML_ID_EDITIONUID:
														$editionentry_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													case EBML_ID_EDITIONFLAGHIDDEN:
													case EBML_ID_EDITIONFLAGDEFAULT:
													case EBML_ID_EDITIONFLAGORDERED:
														$editionentry_entry[$sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													case EBML_ID_CHAPTERATOM:
														$chapteratom_entry = array();

														while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], array(EBML_ID_CHAPTERTRACK, EBML_ID_CHAPTERDISPLAY))) {
															switch ($sub_sub_subelement['id']) {

																case EBML_ID_CHAPTERSEGMENTUID:
																case EBML_ID_CHAPTERSEGMENTEDITIONUID:
																	$chapteratom_entry[$sub_sub_subelement['id_name']] = $sub_sub_subelement['data'];
																	break;

																case EBML_ID_CHAPTERFLAGENABLED:
																case EBML_ID_CHAPTERFLAGHIDDEN:
																	$chapteratom_entry[$sub_sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
																	break;

																case EBML_ID_CHAPTERUID:
																case EBML_ID_CHAPTERTIMESTART:
																case EBML_ID_CHAPTERTIMEEND:
																	$chapteratom_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
																	break;

																case EBML_ID_CHAPTERTRACK:
																	$chaptertrack_entry = array();

																	while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
																		switch ($sub_sub_sub_subelement['id']) {

																			case EBML_ID_CHAPTERTRACKNUMBER:
																				$chaptertrack_entry[$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
																				break;

																			default:
																				$this->unhandledElement('chapters.editionentry.chapteratom.chaptertrack', __LINE__, $sub_sub_sub_subelement);
																				break;
																		}
																	}
																	$chapteratom_entry[$sub_sub_subelement['id_name']][] = $chaptertrack_entry;
																	break;

																case EBML_ID_CHAPTERDISPLAY:
																	$chapterdisplay_entry = array();

																	while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
																		switch ($sub_sub_sub_subelement['id']) {

																			case EBML_ID_CHAPSTRING:
																			case EBML_ID_CHAPLANGUAGE:
																			case EBML_ID_CHAPCOUNTRY:
																				$chapterdisplay_entry[$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
																				break;

																			default:
																				$this->unhandledElement('chapters.editionentry.chapteratom.chapterdisplay', __LINE__, $sub_sub_sub_subelement);
																				break;
																		}
																	}
																	$chapteratom_entry[$sub_sub_subelement['id_name']][] = $chapterdisplay_entry;
																	break;

																default:
																	$this->unhandledElement('chapters.editionentry.chapteratom', __LINE__, $sub_sub_subelement);
																	break;
															}
														}
														$editionentry_entry[$sub_subelement['id_name']][] = $chapteratom_entry;
														break;

													default:
														$this->unhandledElement('chapters.editionentry', __LINE__, $sub_subelement);
														break;
												}
											}
											$info['matroska']['chapters'][] = $editionentry_entry;
											break;

										default:
											$this->unhandledElement('chapters', __LINE__, $subelement);
											break;
									}
								}
								break;

							case EBML_ID_CLUSTER: // The lower level element containing the (monolithic) Block structure.
								$cluster_entry = array();

								while ($this->getEBMLelement($subelement, $element_data['end'], array(EBML_ID_CLUSTERSILENTTRACKS, EBML_ID_CLUSTERBLOCKGROUP, EBML_ID_CLUSTERSIMPLEBLOCK))) {
									switch ($subelement['id']) {

										case EBML_ID_CLUSTERTIMECODE:
										case EBML_ID_CLUSTERPOSITION:
										case EBML_ID_CLUSTERPREVSIZE:
											$cluster_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
											break;

										case EBML_ID_CLUSTERSILENTTRACKS:
											$cluster_silent_tracks = array();

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
												switch ($sub_subelement['id']) {

													case EBML_ID_CLUSTERSILENTTRACKNUMBER:
														$cluster_silent_tracks[] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													default:
														$this->unhandledElement('cluster.silenttracks', __LINE__, $sub_subelement);
														break;
												}
											}
											$cluster_entry[$subelement['id_name']][] = $cluster_silent_tracks;
											break;

										case EBML_ID_CLUSTERBLOCKGROUP:
											$cluster_block_group = array('offset' => $this->current_offset);

											while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CLUSTERBLOCK))) {
												switch ($sub_subelement['id']) {

													case EBML_ID_CLUSTERBLOCK:
														$cluster_block_group[$sub_subelement['id_name']] = $this->HandleEMBLClusterBlock($sub_subelement, EBML_ID_CLUSTERBLOCK, $info);
														break;

													case EBML_ID_CLUSTERREFERENCEPRIORITY: // unsigned-int
													case EBML_ID_CLUSTERBLOCKDURATION:     // unsigned-int
														$cluster_block_group[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
														break;

													case EBML_ID_CLUSTERREFERENCEBLOCK:    // signed-int
														$cluster_block_group[$sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_subelement['data'], false, true);
														break;

													case EBML_ID_CLUSTERCODECSTATE:
														$cluster_block_group[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
														break;

													default:
														$this->unhandledElement('clusters.blockgroup', __LINE__, $sub_subelement);
														break;
												}
											}
											$cluster_entry[$subelement['id_name']][] = $cluster_block_group;
											break;

										case EBML_ID_CLUSTERSIMPLEBLOCK:
											$cluster_entry[$subelement['id_name']][] = $this->HandleEMBLClusterBlock($subelement, EBML_ID_CLUSTERSIMPLEBLOCK, $info);
											break;

										default:
											$this->unhandledElement('cluster', __LINE__, $subelement);
											break;
									}
									$this->current_offset = $subelement['end'];
								}
								if (!self::$hide_clusters) {
									$info['matroska']['cluster'][] = $cluster_entry;
								}

								// check to see if all the data we need exists already, if so, break out of the loop
								if (!self::$parse_whole_file) {
									if (isset($info['matroska']['info']) && is_array($info['matroska']['info'])) {
										if (isset($info['matroska']['tracks']['tracks']) && is_array($info['matroska']['tracks']['tracks'])) {
											if (count($info['matroska']['track_data_offsets']) == count($info['matroska']['tracks']['tracks'])) {
												return;
											}
										}
									}
								}
								break;

							default:
								$this->unhandledElement('segment', __LINE__, $element_data);
								break;
						}
					}
					break;

				default:
					$this->unhandledElement('root', __LINE__, $top_element);
					break;
			}
		}
	}

	private function EnsureBufferHasEnoughData($min_data=1024) {
		if (($this->current_offset - $this->EBMLbuffer_offset) >= ($this->EBMLbuffer_length - $min_data)) {
			$read_bytes = max($min_data, $this->getid3->fread_buffer_size());

			try {
				$this->fseek($this->current_offset);
				$this->EBMLbuffer_offset = $this->current_offset;
				$this->EBMLbuffer        = $this->fread($read_bytes);
				$this->EBMLbuffer_length = strlen($this->EBMLbuffer);
			} catch (getid3_exception $e) {
				$this->warning('EBML parser: '.$e->getMessage());
				return false;
			}

			if ($this->EBMLbuffer_length == 0 && $this->feof()) {
				return $this->error('EBML parser: ran out of file at offset '.$this->current_offset);
			}
		}
		return true;
	}

	private function readEBMLint() {
		$actual_offset = $this->current_offset - $this->EBMLbuffer_offset;

		// get length of integer
		$first_byte_int = ord($this->EBMLbuffer[$actual_offset]);
		if       (0x80 & $first_byte_int) {
			$length = 1;
		} elseif (0x40 & $first_byte_int) {
			$length = 2;
		} elseif (0x20 & $first_byte_int) {
			$length = 3;
		} elseif (0x10 & $first_byte_int) {
			$length = 4;
		} elseif (0x08 & $first_byte_int) {
			$length = 5;
		} elseif (0x04 & $first_byte_int) {
			$length = 6;
		} elseif (0x02 & $first_byte_int) {
			$length = 7;
		} elseif (0x01 & $first_byte_int) {
			$length = 8;
		} else {
			throw new Exception('invalid EBML integer (leading 0x00) at '.$this->current_offset);
		}

		// read
		$int_value = self::EBML2Int(substr($this->EBMLbuffer, $actual_offset, $length));
		$this->current_offset += $length;

		return $int_value;
	}

	private function readEBMLelementData($length, $check_buffer=false) {
		if ($check_buffer && !$this->EnsureBufferHasEnoughData($length)) {
			return false;
		}
		$data = substr($this->EBMLbuffer, $this->current_offset - $this->EBMLbuffer_offset, $length);
		$this->current_offset += $length;
		return $data;
	}

	private function getEBMLelement(&$element, $parent_end, $get_data=false) {
		if ($this->current_offset >= $parent_end) {
			return false;
		}

		if (!$this->EnsureBufferHasEnoughData()) {
			$this->current_offset = PHP_INT_MAX; // do not exit parser right now, allow to finish current loop to gather maximum information
			return false;
		}

		$element = array();

		// set offset
		$element['offset'] = $this->current_offset;

		// get ID
		$element['id'] = $this->readEBMLint();

		// get name
		$element['id_name'] = self::EBMLidName($element['id']);

		// get length
		$element['length'] = $this->readEBMLint();

		// get end offset
		$element['end'] = $this->current_offset + $element['length'];

		// get raw data
		$dont_parse = (in_array($element['id'], $this->unuseful_elements) || $element['id_name'] == dechex($element['id']));
		if (($get_data === true || (is_array($get_data) && !in_array($element['id'], $get_data))) && !$dont_parse) {
			$element['data'] = $this->readEBMLelementData($element['length'], $element);
		}

		return true;
	}

	private function unhandledElement($type, $line, $element) {
		// warn only about unknown and missed elements, not about unuseful
		if (!in_array($element['id'], $this->unuseful_elements)) {
			$this->warning('Unhandled '.$type.' element ['.basename(__FILE__).':'.$line.'] ('.$element['id'].'::'.$element['id_name'].' ['.$element['length'].' bytes]) at '.$element['offset']);
		}

		// increase offset for unparsed elements
		if (!isset($element['data'])) {
			$this->current_offset = $element['end'];
		}
	}

	private function ExtractCommentsSimpleTag($SimpleTagArray) {
		if (!empty($SimpleTagArray['SimpleTag'])) {
			foreach ($SimpleTagArray['SimpleTag'] as $SimpleTagKey => $SimpleTagData) {
				if (!empty($SimpleTagData['TagName']) && !empty($SimpleTagData['TagString'])) {
					$this->getid3->info['matroska']['comments'][strtolower($SimpleTagData['TagName'])][] = $SimpleTagData['TagString'];
				}
				if (!empty($SimpleTagData['SimpleTag'])) {
					$this->ExtractCommentsSimpleTag($SimpleTagData);
				}
			}
		}

		return true;
	}

	private function HandleEMBLSimpleTag($parent_end) {
		$simpletag_entry = array();

		while ($this->getEBMLelement($element, $parent_end, array(EBML_ID_SIMPLETAG))) {
			switch ($element['id']) {

				case EBML_ID_TAGNAME:
				case EBML_ID_TAGLANGUAGE:
				case EBML_ID_TAGSTRING:
				case EBML_ID_TAGBINARY:
					$simpletag_entry[$element['id_name']] = $element['data'];
					break;

				case EBML_ID_SIMPLETAG:
					$simpletag_entry[$element['id_name']][] = $this->HandleEMBLSimpleTag($element['end']);
					break;

				case EBML_ID_TAGDEFAULT:
					$simpletag_entry[$element['id_name']] = (bool)getid3_lib::BigEndian2Int($element['data']);
					break;

				default:
					$this->unhandledElement('tag.simpletag', __LINE__, $element);
					break;
			}
		}

		return $simpletag_entry;
	}

	private function HandleEMBLClusterBlock($element, $block_type, &$info) {
		// http://www.matroska.org/technical/specs/index.html#block_structure
		// http://www.matroska.org/technical/specs/index.html#simpleblock_structure

		$block_data = array();
		$block_data['tracknumber'] = $this->readEBMLint();
		$block_data['timecode']    = getid3_lib::BigEndian2Int($this->readEBMLelementData(2), false, true);
		$block_data['flags_raw']   = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));

		if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {
			$block_data['flags']['keyframe']  = (($block_data['flags_raw'] & 0x80) >> 7);
			//$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0x70) >> 4);
		}
		else {
			//$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0xF0) >> 4);
		}
		$block_data['flags']['invisible'] = (bool)(($block_data['flags_raw'] & 0x08) >> 3);
		$block_data['flags']['lacing']    =       (($block_data['flags_raw'] & 0x06) >> 1);  // 00=no lacing; 01=Xiph lacing; 11=EBML lacing; 10=fixed-size lacing
		if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {
			$block_data['flags']['discardable'] = (($block_data['flags_raw'] & 0x01));
		}
		else {
			//$block_data['flags']['reserved2'] = (($block_data['flags_raw'] & 0x01) >> 0);
		}
		$block_data['flags']['lacing_type'] = self::BlockLacingType($block_data['flags']['lacing']);

		// Lace (when lacing bit is set)
		if ($block_data['flags']['lacing'] > 0) {
			$block_data['lace_frames'] = getid3_lib::BigEndian2Int($this->readEBMLelementData(1)) + 1; // Number of frames in the lace-1 (uint8)
			if ($block_data['flags']['lacing'] != 0x02) {
				for ($i = 1; $i < $block_data['lace_frames']; $i ++) { // Lace-coded size of each frame of the lace, except for the last one (multiple uint8). *This is not used with Fixed-size lacing as it is calculated automatically from (total size of lace) / (number of frames in lace).
					if ($block_data['flags']['lacing'] == 0x03) { // EBML lacing
						$block_data['lace_frames_size'][$i] = $this->readEBMLint(); // TODO: read size correctly, calc size for the last frame. For now offsets are deteminded OK with readEBMLint() and that's the most important thing.
					}
					else { // Xiph lacing
						$block_data['lace_frames_size'][$i] = 0;
						do {
							$size = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));
							$block_data['lace_frames_size'][$i] += $size;
						}
						while ($size == 255);
					}
				}
				if ($block_data['flags']['lacing'] == 0x01) { // calc size of the last frame only for Xiph lacing, till EBML sizes are now anyway determined incorrectly
					$block_data['lace_frames_size'][] = $element['end'] - $this->current_offset - array_sum($block_data['lace_frames_size']);
				}
			}
		}

		if (!isset($info['matroska']['track_data_offsets'][$block_data['tracknumber']])) {
			$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['offset'] = $this->current_offset;
			$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'] = $element['end'] - $this->current_offset;
			//$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] = 0;
		}
		//$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] += $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'];
		//$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['duration']      = $block_data['timecode'] * ((isset($info['matroska']['info'][0]['TimecodeScale']) ? $info['matroska']['info'][0]['TimecodeScale'] : 1000000) / 1000000000);

		// set offset manually
		$this->current_offset = $element['end'];

		return $block_data;
	}

	private static 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

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

		return getid3_lib::BigEndian2Int($EBMLstring);
	}

	private static function EBMLdate2unix($EBMLdatestamp) {
		// Date - signed 8 octets integer in nanoseconds with 0 indicating the precise beginning of the millennium (at 2001-01-01T00:00:00,000000000 UTC)
		// 978307200 == mktime(0, 0, 0, 1, 1, 2001) == January 1, 2001 12:00:00am UTC
		return round(($EBMLdatestamp / 1000000000) + 978307200);
	}

	public static function TargetTypeValue($target_type) {
		// http://www.matroska.org/technical/specs/tagging/index.html
		static $TargetTypeValue = array();
		if (empty($TargetTypeValue)) {
			$TargetTypeValue[10] = 'A: ~ V:shot';                                           // the lowest hierarchy found in music or movies
			$TargetTypeValue[20] = 'A:subtrack/part/movement ~ V:scene';                    // corresponds to parts of a track for audio (like a movement)
			$TargetTypeValue[30] = 'A:track/song ~ V:chapter';                              // the common parts of an album or a movie
			$TargetTypeValue[40] = 'A:part/session ~ V:part/session';                       // when an album or episode has different logical parts
			$TargetTypeValue[50] = 'A:album/opera/concert ~ V:movie/episode/concert';       // the most common grouping level of music and video (equals to an episode for TV series)
			$TargetTypeValue[60] = 'A:edition/issue/volume/opus ~ V:season/sequel/volume';  // a list of lower levels grouped together
			$TargetTypeValue[70] = 'A:collection ~ V:collection';                           // the high hierarchy consisting of many different lower items
		}
		return (isset($TargetTypeValue[$target_type]) ? $TargetTypeValue[$target_type] : $target_type);
	}

	public static function BlockLacingType($lacingtype) {
		// http://matroska.org/technical/specs/index.html#block_structure
		static $BlockLacingType = array();
		if (empty($BlockLacingType)) {
			$BlockLacingType[0x00] = 'no lacing';
			$BlockLacingType[0x01] = 'Xiph lacing';
			$BlockLacingType[0x02] = 'fixed-size lacing';
			$BlockLacingType[0x03] = 'EBML lacing';
		}
		return (isset($BlockLacingType[$lacingtype]) ? $BlockLacingType[$lacingtype] : $lacingtype);
	}

	public static function CodecIDtoCommonName($codecid) {
		// http://www.matroska.org/technical/specs/codecid/index.html
		static $CodecIDlist = array();
		if (empty($CodecIDlist)) {
			$CodecIDlist['A_AAC']            = 'aac';
			$CodecIDlist['A_AAC/MPEG2/LC']   = 'aac';
			$CodecIDlist['A_AC3']            = 'ac3';
			$CodecIDlist['A_EAC3']           = 'eac3';
			$CodecIDlist['A_DTS']            = 'dts';
			$CodecIDlist['A_FLAC']           = 'flac';
			$CodecIDlist['A_MPEG/L1']        = 'mp1';
			$CodecIDlist['A_MPEG/L2']        = 'mp2';
			$CodecIDlist['A_MPEG/L3']        = 'mp3';
			$CodecIDlist['A_PCM/INT/LIT']    = 'pcm';       // PCM Integer Little Endian
			$CodecIDlist['A_PCM/INT/BIG']    = 'pcm';       // PCM Integer Big Endian
			$CodecIDlist['A_QUICKTIME/QDMC'] = 'quicktime'; // Quicktime: QDesign Music
			$CodecIDlist['A_QUICKTIME/QDM2'] = 'quicktime'; // Quicktime: QDesign Music v2
			$CodecIDlist['A_VORBIS']         = 'vorbis';
			$CodecIDlist['V_MPEG1']          = 'mpeg';
			$CodecIDlist['V_THEORA']         = 'theora';
			$CodecIDlist['V_REAL/RV40']      = 'real';
			$CodecIDlist['V_REAL/RV10']      = 'real';
			$CodecIDlist['V_REAL/RV20']      = 'real';
			$CodecIDlist['V_REAL/RV30']      = 'real';
			$CodecIDlist['V_QUICKTIME']      = 'quicktime'; // Quicktime
			$CodecIDlist['V_MPEG4/ISO/AP']   = 'mpeg4';
			$CodecIDlist['V_MPEG4/ISO/ASP']  = 'mpeg4';
			$CodecIDlist['V_MPEG4/ISO/AVC']  = 'h264';
			$CodecIDlist['V_MPEG4/ISO/SP']   = 'mpeg4';
			$CodecIDlist['V_VP8']            = 'vp8';
			$CodecIDlist['V_MS/VFW/FOURCC']  = 'vcm'; // Microsoft (TM) Video Codec Manager (VCM)
			$CodecIDlist['A_MS/ACM']         = 'acm'; // Microsoft (TM) Audio Codec Manager (ACM)
		}
		return (isset($CodecIDlist[$codecid]) ? $CodecIDlist[$codecid] : $codecid);
	}

	private static function EBMLidName($value) {
		static $EBMLidList = array();
		if (empty($EBMLidList)) {
			$EBMLidList[EBML_ID_ASPECTRATIOTYPE]            = 'AspectRatioType';
			$EBMLidList[EBML_ID_ATTACHEDFILE]               = 'AttachedFile';
			$EBMLidList[EBML_ID_ATTACHMENTLINK]             = 'AttachmentLink';
			$EBMLidList[EBML_ID_ATTACHMENTS]                = 'Attachments';
			$EBMLidList[EBML_ID_AUDIO]                      = 'Audio';
			$EBMLidList[EBML_ID_BITDEPTH]                   = 'BitDepth';
			$EBMLidList[EBML_ID_CHANNELPOSITIONS]           = 'ChannelPositions';
			$EBMLidList[EBML_ID_CHANNELS]                   = 'Channels';
			$EBMLidList[EBML_ID_CHAPCOUNTRY]                = 'ChapCountry';
			$EBMLidList[EBML_ID_CHAPLANGUAGE]               = 'ChapLanguage';
			$EBMLidList[EBML_ID_CHAPPROCESS]                = 'ChapProcess';
			$EBMLidList[EBML_ID_CHAPPROCESSCODECID]         = 'ChapProcessCodecID';
			$EBMLidList[EBML_ID_CHAPPROCESSCOMMAND]         = 'ChapProcessCommand';
			$EBMLidList[EBML_ID_CHAPPROCESSDATA]            = 'ChapProcessData';
			$EBMLidList[EBML_ID_CHAPPROCESSPRIVATE]         = 'ChapProcessPrivate';
			$EBMLidList[EBML_ID_CHAPPROCESSTIME]            = 'ChapProcessTime';
			$EBMLidList[EBML_ID_CHAPSTRING]                 = 'ChapString';
			$EBMLidList[EBML_ID_CHAPTERATOM]                = 'ChapterAtom';
			$EBMLidList[EBML_ID_CHAPTERDISPLAY]             = 'ChapterDisplay';
			$EBMLidList[EBML_ID_CHAPTERFLAGENABLED]         = 'ChapterFlagEnabled';
			$EBMLidList[EBML_ID_CHAPTERFLAGHIDDEN]          = 'ChapterFlagHidden';
			$EBMLidList[EBML_ID_CHAPTERPHYSICALEQUIV]       = 'ChapterPhysicalEquiv';
			$EBMLidList[EBML_ID_CHAPTERS]                   = 'Chapters';
			$EBMLidList[EBML_ID_CHAPTERSEGMENTEDITIONUID]   = 'ChapterSegmentEditionUID';
			$EBMLidList[EBML_ID_CHAPTERSEGMENTUID]          = 'ChapterSegmentUID';
			$EBMLidList[EBML_ID_CHAPTERTIMEEND]             = 'ChapterTimeEnd';
			$EBMLidList[EBML_ID_CHAPTERTIMESTART]           = 'ChapterTimeStart';
			$EBMLidList[EBML_ID_CHAPTERTRACK]               = 'ChapterTrack';
			$EBMLidList[EBML_ID_CHAPTERTRACKNUMBER]         = 'ChapterTrackNumber';
			$EBMLidList[EBML_ID_CHAPTERTRANSLATE]           = 'ChapterTranslate';
			$EBMLidList[EBML_ID_CHAPTERTRANSLATECODEC]      = 'ChapterTranslateCodec';
			$EBMLidList[EBML_ID_CHAPTERTRANSLATEEDITIONUID] = 'ChapterTranslateEditionUID';
			$EBMLidList[EBML_ID_CHAPTERTRANSLATEID]         = 'ChapterTranslateID';
			$EBMLidList[EBML_ID_CHAPTERUID]                 = 'ChapterUID';
			$EBMLidList[EBML_ID_CLUSTER]                    = 'Cluster';
			$EBMLidList[EBML_ID_CLUSTERBLOCK]               = 'ClusterBlock';
			$EBMLidList[EBML_ID_CLUSTERBLOCKADDID]          = 'ClusterBlockAddID';
			$EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONAL]     = 'ClusterBlockAdditional';
			$EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONID]     = 'ClusterBlockAdditionID';
			$EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONS]      = 'ClusterBlockAdditions';
			$EBMLidList[EBML_ID_CLUSTERBLOCKDURATION]       = 'ClusterBlockDuration';
			$EBMLidList[EBML_ID_CLUSTERBLOCKGROUP]          = 'ClusterBlockGroup';
			$EBMLidList[EBML_ID_CLUSTERBLOCKMORE]           = 'ClusterBlockMore';
			$EBMLidList[EBML_ID_CLUSTERBLOCKVIRTUAL]        = 'ClusterBlockVirtual';
			$EBMLidList[EBML_ID_CLUSTERCODECSTATE]          = 'ClusterCodecState';
			$EBMLidList[EBML_ID_CLUSTERDELAY]               = 'ClusterDelay';
			$EBMLidList[EBML_ID_CLUSTERDURATION]            = 'ClusterDuration';
			$EBMLidList[EBML_ID_CLUSTERENCRYPTEDBLOCK]      = 'ClusterEncryptedBlock';
			$EBMLidList[EBML_ID_CLUSTERFRAMENUMBER]         = 'ClusterFrameNumber';
			$EBMLidList[EBML_ID_CLUSTERLACENUMBER]          = 'ClusterLaceNumber';
			$EBMLidList[EBML_ID_CLUSTERPOSITION]            = 'ClusterPosition';
			$EBMLidList[EBML_ID_CLUSTERPREVSIZE]            = 'ClusterPrevSize';
			$EBMLidList[EBML_ID_CLUSTERREFERENCEBLOCK]      = 'ClusterReferenceBlock';
			$EBMLidList[EBML_ID_CLUSTERREFERENCEPRIORITY]   = 'ClusterReferencePriority';
			$EBMLidList[EBML_ID_CLUSTERREFERENCEVIRTUAL]    = 'ClusterReferenceVirtual';
			$EBMLidList[EBML_ID_CLUSTERSILENTTRACKNUMBER]   = 'ClusterSilentTrackNumber';
			$EBMLidList[EBML_ID_CLUSTERSILENTTRACKS]        = 'ClusterSilentTracks';
			$EBMLidList[EBML_ID_CLUSTERSIMPLEBLOCK]         = 'ClusterSimpleBlock';
			$EBMLidList[EBML_ID_CLUSTERTIMECODE]            = 'ClusterTimecode';
			$EBMLidList[EBML_ID_CLUSTERTIMESLICE]           = 'ClusterTimeSlice';
			$EBMLidList[EBML_ID_CODECDECODEALL]             = 'CodecDecodeAll';
			$EBMLidList[EBML_ID_CODECDOWNLOADURL]           = 'CodecDownloadURL';
			$EBMLidList[EBML_ID_CODECID]                    = 'CodecID';
			$EBMLidList[EBML_ID_CODECINFOURL]               = 'CodecInfoURL';
			$EBMLidList[EBML_ID_CODECNAME]                  = 'CodecName';
			$EBMLidList[EBML_ID_CODECPRIVATE]               = 'CodecPrivate';
			$EBMLidList[EBML_ID_CODECSETTINGS]              = 'CodecSettings';
			$EBMLidList[EBML_ID_COLOURSPACE]                = 'ColourSpace';
			$EBMLidList[EBML_ID_CONTENTCOMPALGO]            = 'ContentCompAlgo';
			$EBMLidList[EBML_ID_CONTENTCOMPRESSION]         = 'ContentCompression';
			$EBMLidList[EBML_ID_CONTENTCOMPSETTINGS]        = 'ContentCompSettings';
			$EBMLidList[EBML_ID_CONTENTENCALGO]             = 'ContentEncAlgo';
			$EBMLidList[EBML_ID_CONTENTENCKEYID]            = 'ContentEncKeyID';
			$EBMLidList[EBML_ID_CONTENTENCODING]            = 'ContentEncoding';
			$EBMLidList[EBML_ID_CONTENTENCODINGORDER]       = 'ContentEncodingOrder';
			$EBMLidList[EBML_ID_CONTENTENCODINGS]           = 'ContentEncodings';
			$EBMLidList[EBML_ID_CONTENTENCODINGSCOPE]       = 'ContentEncodingScope';
			$EBMLidList[EBML_ID_CONTENTENCODINGTYPE]        = 'ContentEncodingType';
			$EBMLidList[EBML_ID_CONTENTENCRYPTION]          = 'ContentEncryption';
			$EBMLidList[EBML_ID_CONTENTSIGALGO]             = 'ContentSigAlgo';
			$EBMLidList[EBML_ID_CONTENTSIGHASHALGO]         = 'ContentSigHashAlgo';
			$EBMLidList[EBML_ID_CONTENTSIGKEYID]            = 'ContentSigKeyID';
			$EBMLidList[EBML_ID_CONTENTSIGNATURE]           = 'ContentSignature';
			$EBMLidList[EBML_ID_CRC32]                      = 'CRC32';
			$EBMLidList[EBML_ID_CUEBLOCKNUMBER]             = 'CueBlockNumber';
			$EBMLidList[EBML_ID_CUECLUSTERPOSITION]         = 'CueClusterPosition';
			$EBMLidList[EBML_ID_CUECODECSTATE]              = 'CueCodecState';
			$EBMLidList[EBML_ID_CUEPOINT]                   = 'CuePoint';
			$EBMLidList[EBML_ID_CUEREFCLUSTER]              = 'CueRefCluster';
			$EBMLidList[EBML_ID_CUEREFCODECSTATE]           = 'CueRefCodecState';
			$EBMLidList[EBML_ID_CUEREFERENCE]               = 'CueReference';
			$EBMLidList[EBML_ID_CUEREFNUMBER]               = 'CueRefNumber';
			$EBMLidList[EBML_ID_CUEREFTIME]                 = 'CueRefTime';
			$EBMLidList[EBML_ID_CUES]                       = 'Cues';
			$EBMLidList[EBML_ID_CUETIME]                    = 'CueTime';
			$EBMLidList[EBML_ID_CUETRACK]                   = 'CueTrack';
			$EBMLidList[EBML_ID_CUETRACKPOSITIONS]          = 'CueTrackPositions';
			$EBMLidList[EBML_ID_DATEUTC]                    = 'DateUTC';
			$EBMLidList[EBML_ID_DEFAULTDURATION]            = 'DefaultDuration';
			$EBMLidList[EBML_ID_DISPLAYHEIGHT]              = 'DisplayHeight';
			$EBMLidList[EBML_ID_DISPLAYUNIT]                = 'DisplayUnit';
			$EBMLidList[EBML_ID_DISPLAYWIDTH]               = 'DisplayWidth';
			$EBMLidList[EBML_ID_DOCTYPE]                    = 'DocType';
			$EBMLidList[EBML_ID_DOCTYPEREADVERSION]         = 'DocTypeReadVersion';
			$EBMLidList[EBML_ID_DOCTYPEVERSION]             = 'DocTypeVersion';
			$EBMLidList[EBML_ID_DURATION]                   = 'Duration';
			$EBMLidList[EBML_ID_EBML]                       = 'EBML';
			$EBMLidList[EBML_ID_EBMLMAXIDLENGTH]            = 'EBMLMaxIDLength';
			$EBMLidList[EBML_ID_EBMLMAXSIZELENGTH]          = 'EBMLMaxSizeLength';
			$EBMLidList[EBML_ID_EBMLREADVERSION]            = 'EBMLReadVersion';
			$EBMLidList[EBML_ID_EBMLVERSION]                = 'EBMLVersion';
			$EBMLidList[EBML_ID_EDITIONENTRY]               = 'EditionEntry';
			$EBMLidList[EBML_ID_EDITIONFLAGDEFAULT]         = 'EditionFlagDefault';
			$EBMLidList[EBML_ID_EDITIONFLAGHIDDEN]          = 'EditionFlagHidden';
			$EBMLidList[EBML_ID_EDITIONFLAGORDERED]         = 'EditionFlagOrdered';
			$EBMLidList[EBML_ID_EDITIONUID]                 = 'EditionUID';
			$EBMLidList[EBML_ID_FILEDATA]                   = 'FileData';
			$EBMLidList[EBML_ID_FILEDESCRIPTION]            = 'FileDescription';
			$EBMLidList[EBML_ID_FILEMIMETYPE]               = 'FileMimeType';
			$EBMLidList[EBML_ID_FILENAME]                   = 'FileName';
			$EBMLidList[EBML_ID_FILEREFERRAL]               = 'FileReferral';
			$EBMLidList[EBML_ID_FILEUID]                    = 'FileUID';
			$EBMLidList[EBML_ID_FLAGDEFAULT]                = 'FlagDefault';
			$EBMLidList[EBML_ID_FLAGENABLED]                = 'FlagEnabled';
			$EBMLidList[EBML_ID_FLAGFORCED]                 = 'FlagForced';
			$EBMLidList[EBML_ID_FLAGINTERLACED]             = 'FlagInterlaced';
			$EBMLidList[EBML_ID_FLAGLACING]                 = 'FlagLacing';
			$EBMLidList[EBML_ID_GAMMAVALUE]                 = 'GammaValue';
			$EBMLidList[EBML_ID_INFO]                       = 'Info';
			$EBMLidList[EBML_ID_LANGUAGE]                   = 'Language';
			$EBMLidList[EBML_ID_MAXBLOCKADDITIONID]         = 'MaxBlockAdditionID';
			$EBMLidList[EBML_ID_MAXCACHE]                   = 'MaxCache';
			$EBMLidList[EBML_ID_MINCACHE]                   = 'MinCache';
			$EBMLidList[EBML_ID_MUXINGAPP]                  = 'MuxingApp';
			$EBMLidList[EBML_ID_NAME]                       = 'Name';
			$EBMLidList[EBML_ID_NEXTFILENAME]               = 'NextFilename';
			$EBMLidList[EBML_ID_NEXTUID]                    = 'NextUID';
			$EBMLidList[EBML_ID_OUTPUTSAMPLINGFREQUENCY]    = 'OutputSamplingFrequency';
			$EBMLidList[EBML_ID_PIXELCROPBOTTOM]            = 'PixelCropBottom';
			$EBMLidList[EBML_ID_PIXELCROPLEFT]              = 'PixelCropLeft';
			$EBMLidList[EBML_ID_PIXELCROPRIGHT]             = 'PixelCropRight';
			$EBMLidList[EBML_ID_PIXELCROPTOP]               = 'PixelCropTop';
			$EBMLidList[EBML_ID_PIXELHEIGHT]                = 'PixelHeight';
			$EBMLidList[EBML_ID_PIXELWIDTH]                 = 'PixelWidth';
			$EBMLidList[EBML_ID_PREVFILENAME]               = 'PrevFilename';
			$EBMLidList[EBML_ID_PREVUID]                    = 'PrevUID';
			$EBMLidList[EBML_ID_SAMPLINGFREQUENCY]          = 'SamplingFrequency';
			$EBMLidList[EBML_ID_SEEK]                       = 'Seek';
			$EBMLidList[EBML_ID_SEEKHEAD]                   = 'SeekHead';
			$EBMLidList[EBML_ID_SEEKID]                     = 'SeekID';
			$EBMLidList[EBML_ID_SEEKPOSITION]               = 'SeekPosition';
			$EBMLidList[EBML_ID_SEGMENT]                    = 'Segment';
			$EBMLidList[EBML_ID_SEGMENTFAMILY]              = 'SegmentFamily';
			$EBMLidList[EBML_ID_SEGMENTFILENAME]            = 'SegmentFilename';
			$EBMLidList[EBML_ID_SEGMENTUID]                 = 'SegmentUID';
			$EBMLidList[EBML_ID_SIMPLETAG]                  = 'SimpleTag';
			$EBMLidList[EBML_ID_CLUSTERSLICES]              = 'ClusterSlices';
			$EBMLidList[EBML_ID_STEREOMODE]                 = 'StereoMode';
			$EBMLidList[EBML_ID_OLDSTEREOMODE]              = 'OldStereoMode';
			$EBMLidList[EBML_ID_TAG]                        = 'Tag';
			$EBMLidList[EBML_ID_TAGATTACHMENTUID]           = 'TagAttachmentUID';
			$EBMLidList[EBML_ID_TAGBINARY]                  = 'TagBinary';
			$EBMLidList[EBML_ID_TAGCHAPTERUID]              = 'TagChapterUID';
			$EBMLidList[EBML_ID_TAGDEFAULT]                 = 'TagDefault';
			$EBMLidList[EBML_ID_TAGEDITIONUID]              = 'TagEditionUID';
			$EBMLidList[EBML_ID_TAGLANGUAGE]                = 'TagLanguage';
			$EBMLidList[EBML_ID_TAGNAME]                    = 'TagName';
			$EBMLidList[EBML_ID_TAGTRACKUID]                = 'TagTrackUID';
			$EBMLidList[EBML_ID_TAGS]                       = 'Tags';
			$EBMLidList[EBML_ID_TAGSTRING]                  = 'TagString';
			$EBMLidList[EBML_ID_TARGETS]                    = 'Targets';
			$EBMLidList[EBML_ID_TARGETTYPE]                 = 'TargetType';
			$EBMLidList[EBML_ID_TARGETTYPEVALUE]            = 'TargetTypeValue';
			$EBMLidList[EBML_ID_TIMECODESCALE]              = 'TimecodeScale';
			$EBMLidList[EBML_ID_TITLE]                      = 'Title';
			$EBMLidList[EBML_ID_TRACKENTRY]                 = 'TrackEntry';
			$EBMLidList[EBML_ID_TRACKNUMBER]                = 'TrackNumber';
			$EBMLidList[EBML_ID_TRACKOFFSET]                = 'TrackOffset';
			$EBMLidList[EBML_ID_TRACKOVERLAY]               = 'TrackOverlay';
			$EBMLidList[EBML_ID_TRACKS]                     = 'Tracks';
			$EBMLidList[EBML_ID_TRACKTIMECODESCALE]         = 'TrackTimecodeScale';
			$EBMLidList[EBML_ID_TRACKTRANSLATE]             = 'TrackTranslate';
			$EBMLidList[EBML_ID_TRACKTRANSLATECODEC]        = 'TrackTranslateCodec';
			$EBMLidList[EBML_ID_TRACKTRANSLATEEDITIONUID]   = 'TrackTranslateEditionUID';
			$EBMLidList[EBML_ID_TRACKTRANSLATETRACKID]      = 'TrackTranslateTrackID';
			$EBMLidList[EBML_ID_TRACKTYPE]                  = 'TrackType';
			$EBMLidList[EBML_ID_TRACKUID]                   = 'TrackUID';
			$EBMLidList[EBML_ID_VIDEO]                      = 'Video';
			$EBMLidList[EBML_ID_VOID]                       = 'Void';
			$EBMLidList[EBML_ID_WRITINGAPP]                 = 'WritingApp';
		}

		return (isset($EBMLidList[$value]) ? $EBMLidList[$value] : dechex($value));
	}

	public static function displayUnit($value) {
		// http://www.matroska.org/technical/specs/index.html#DisplayUnit
		static $units = array(
			0 => 'pixels',
			1 => 'centimeters',
			2 => 'inches',
			3 => 'Display Aspect Ratio');

		return (isset($units[$value]) ? $units[$value] : 'unknown');
	}

	private static function getDefaultStreamInfo($streams)
	{
		foreach (array_reverse($streams) as $stream) {
			if ($stream['default']) {
				break;
			}
		}

		$unset = array('default', 'name');
		foreach ($unset as $u) {
			if (isset($stream[$u])) {
				unset($stream[$u]);
			}
		}

		$info = $stream;
		$info['streams'] = $streams;

		return $info;
	}

}