getid3_dts::Analyze

	/**
	 * @return bool
	 */
	public function Analyze() {
		$info = &$this->getid3->info;
		$info['fileformat'] = 'dts';

		$this->fseek($info['avdataoffset']);
		$DTSheader = $this->fread(20); // we only need 2 words magic + 6 words frame header, but these words may be normal 16-bit words OR 14-bit words with 2 highest bits set to zero, so 8 words can be either 8*16/8 = 16 bytes OR 8*16*(16/14)/8 = 18.3 bytes

		// check syncword
		$sync = substr($DTSheader, 0, 4);
		if (($encoding = array_search($sync, self::$syncwords)) !== false) {

			$info['dts']['raw']['magic'] = $sync;
			$this->readBinDataOffset = 32;

		} elseif ($this->isDependencyFor('matroska')) {

			// Matroska contains DTS without syncword encoded as raw big-endian format
			$encoding = 0;
			$this->readBinDataOffset = 0;

		} else {

			unset($info['fileformat']);
			return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');

		}

		// decode header
		$fhBS = '';
		for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) {
			switch ($encoding) {
				case 0: // raw big-endian
					$fhBS .=        getid3_lib::BigEndian2Bin(       substr($DTSheader, $word_offset, 2) );
					break;
				case 1: // raw little-endian
					$fhBS .=        getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2)));
					break;
				case 2: // 14-bit big-endian
					$fhBS .= substr(getid3_lib::BigEndian2Bin(       substr($DTSheader, $word_offset, 2) ), 2, 14);
					break;
				case 3: // 14-bit little-endian
					$fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14);
					break;
			}
		}

		$info['dts']['raw']['frame_type']             =        $this->readBinData($fhBS,  1);
		$info['dts']['raw']['deficit_samples']        =        $this->readBinData($fhBS,  5);
		$info['dts']['flags']['crc_present']          = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['raw']['pcm_sample_blocks']      =        $this->readBinData($fhBS,  7);
		$info['dts']['raw']['frame_byte_size']        =        $this->readBinData($fhBS, 14);
		$info['dts']['raw']['channel_arrangement']    =        $this->readBinData($fhBS,  6);
		$info['dts']['raw']['sample_frequency']       =        $this->readBinData($fhBS,  4);
		$info['dts']['raw']['bitrate']                =        $this->readBinData($fhBS,  5);
		$info['dts']['flags']['embedded_downmix']     = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['dynamicrange']         = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['timestamp']            = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['auxdata']              = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['hdcd']                 = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['raw']['extension_audio']        =        $this->readBinData($fhBS,  3);
		$info['dts']['flags']['extended_coding']      = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['raw']['lfe_effects']            =        $this->readBinData($fhBS,  2);
		$info['dts']['flags']['predictor_history']    = (bool) $this->readBinData($fhBS,  1);
		if ($info['dts']['flags']['crc_present']) {
			$info['dts']['raw']['crc16']              =        $this->readBinData($fhBS, 16);
		}
		$info['dts']['flags']['mri_perfect_reconst']  = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['raw']['encoder_soft_version']   =        $this->readBinData($fhBS,  4);
		$info['dts']['raw']['copy_history']           =        $this->readBinData($fhBS,  2);
		$info['dts']['raw']['bits_per_sample']        =        $this->readBinData($fhBS,  2);
		$info['dts']['flags']['surround_es']          = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['front_sum_diff']       = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['flags']['surround_sum_diff']    = (bool) $this->readBinData($fhBS,  1);
		$info['dts']['raw']['dialog_normalization']   =        $this->readBinData($fhBS,  4);


		$info['dts']['bitrate']              = self::bitrateLookup($info['dts']['raw']['bitrate']);
		$info['dts']['bits_per_sample']      = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']);
		$info['dts']['sample_rate']          = self::sampleRateLookup($info['dts']['raw']['sample_frequency']);
		$info['dts']['dialog_normalization'] = self::dialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']);
		$info['dts']['flags']['lossless']    = (($info['dts']['raw']['bitrate'] == 31) ? true  : false);
		$info['dts']['bitrate_mode']         = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
		$info['dts']['channels']             = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']);
		$info['dts']['channel_arrangement']  = self::channelArrangementLookup($info['dts']['raw']['channel_arrangement']);

		$info['audio']['dataformat']          = 'dts';
		$info['audio']['lossless']            = $info['dts']['flags']['lossless'];
		$info['audio']['bitrate_mode']        = $info['dts']['bitrate_mode'];
		$info['audio']['bits_per_sample']     = $info['dts']['bits_per_sample'];
		$info['audio']['sample_rate']         = $info['dts']['sample_rate'];
		$info['audio']['channels']            = $info['dts']['channels'];
		$info['audio']['bitrate']             = $info['dts']['bitrate'];
		if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
			$info['playtime_seconds']         = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
			if (($encoding == 2) || ($encoding == 3)) {
				// 14-bit data packed into 16-bit words, so the playtime is wrong because only (14/16) of the bytes in the data portion of the file are used at the specified bitrate
				$info['playtime_seconds'] *= (14 / 16);
			}