--- /dev/null
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+/////////////////////////////////////////////////////////////////
+// See readme.txt for more details //
+/////////////////////////////////////////////////////////////////
+// //
+// module.audio.dts.php //
+// module for analyzing DTS Audio files //
+// dependencies: NONE //
+// //
+/////////////////////////////////////////////////////////////////
+
+
+/**
+* @tutorial http://wiki.multimedia.cx/index.php?title=DTS
+*/
+class getid3_dts extends getid3_handler
+{
+ /**
+ * Default DTS syncword used in native .cpt or .dts formats
+ */
+ const syncword = "\x7F\xFE\x80\x01";
+
+ private $readBinDataOffset = 0;
+
+ /**
+ * Possible syncwords indicating bitstream encoding
+ */
+ public static $syncwords = array(
+ 0 => "\x7F\xFE\x80\x01", // raw big-endian
+ 1 => "\xFE\x7F\x01\x80", // raw little-endian
+ 2 => "\x1F\xFF\xE8\x00", // 14-bit big-endian
+ 3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian
+
+ 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
+ $info['playtime_seconds'] *= (14 / 16);
+ }
+ }
+ return true;
+ }
+
+ private function readBinData($bin, $length) {
+ $data = substr($bin, $this->readBinDataOffset, $length);
+ $this->readBinDataOffset += $length;
+
+ return bindec($data);
+ }
+
+ public static function bitrateLookup($index) {
+ static $lookup = array(
+ 0 => 32000,
+ 1 => 56000,
+ 2 => 64000,
+ 3 => 96000,
+ 4 => 112000,
+ 5 => 128000,
+ 6 => 192000,
+ 7 => 224000,
+ 8 => 256000,
+ 9 => 320000,
+ 10 => 384000,
+ 11 => 448000,
+ 12 => 512000,
+ 13 => 576000,
+ 14 => 640000,
+ 15 => 768000,
+ 16 => 960000,
+ 17 => 1024000,
+ 18 => 1152000,
+ 19 => 1280000,
+ 20 => 1344000,
+ 21 => 1408000,
+ 22 => 1411200,
+ 23 => 1472000,
+ 24 => 1536000,
+ 25 => 1920000,
+ 26 => 2048000,
+ 27 => 3072000,
+ 28 => 3840000,
+ 29 => 'open',
+ 30 => 'variable',
+ 31 => 'lossless',
+ );
+ return (isset($lookup[$index]) ? $lookup[$index] : false);
+ }
+
+ public static function sampleRateLookup($index) {
+ static $lookup = array(
+ 0 => 'invalid',
+ 1 => 8000,
+ 2 => 16000,
+ 3 => 32000,
+ 4 => 'invalid',
+ 5 => 'invalid',
+ 6 => 11025,
+ 7 => 22050,
+ 8 => 44100,
+ 9 => 'invalid',
+ 10 => 'invalid',
+ 11 => 12000,
+ 12 => 24000,
+ 13 => 48000,
+ 14 => 'invalid',
+ 15 => 'invalid',
+ );
+ return (isset($lookup[$index]) ? $lookup[$index] : false);
+ }
+
+ public static function bitPerSampleLookup($index) {
+ static $lookup = array(
+ 0 => 16,
+ 1 => 20,
+ 2 => 24,
+ 3 => 24,
+ );
+ return (isset($lookup[$index]) ? $lookup[$index] : false);
+ }
+
+ public static function numChannelsLookup($index) {
+ switch ($index) {
+ case 0:
+ return 1;
+ break;
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ return 2;
+ break;
+ case 5:
+ case 6:
+ return 3;
+ break;
+ case 7:
+ case 8:
+ return 4;
+ break;
+ case 9:
+ return 5;
+ break;
+ case 10:
+ case 11:
+ case 12:
+ return 6;
+ break;
+ case 13:
+ return 7;
+ break;
+ case 14:
+ case 15:
+ return 8;
+ break;
+ }
+ return false;
+ }
+
+ public static function channelArrangementLookup($index) {
+ static $lookup = array(
+ 0 => 'A',
+ 1 => 'A + B (dual mono)',
+ 2 => 'L + R (stereo)',
+ 3 => '(L+R) + (L-R) (sum-difference)',
+ 4 => 'LT + RT (left and right total)',
+ 5 => 'C + L + R',
+ 6 => 'L + R + S',
+ 7 => 'C + L + R + S',
+ 8 => 'L + R + SL + SR',
+ 9 => 'C + L + R + SL + SR',
+ 10 => 'CL + CR + L + R + SL + SR',
+ 11 => 'C + L + R+ LR + RR + OV',
+ 12 => 'CF + CR + LF + RF + LR + RR',
+ 13 => 'CL + C + CR + L + R + SL + SR',
+ 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
+ 15 => 'CL + C+ CR + L + R + SL + S + SR',
+ );
+ return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined');
+ }
+
+ public static function dialogNormalization($index, $version) {
+ switch ($version) {
+ case 7:
+ return 0 - $index;
+ break;
+ case 6:
+ return 0 - 16 - $index;
+ break;
+ }
+ return false;
+ }
+
+}
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