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<?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.audio.dts.php // // module for analyzing DTS Audio files // // dependencies: NONE // // // ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } /** * @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"; /* * @var int / 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 /* * @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 816/8 = 16 bytes OR 816(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; } /* * @param string $bin * @param int $length * * @return int / private function readBinData($bin, $length) { $data = substr($bin, $this->readBinDataOffset, $length); $this->readBinDataOffset += $length; return bindec($data); } /* * @param int $index * * @return int\|string\|false / public static function bitrateLookup($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); } /* * @param int $index * * @return int\|string\|false / public static function sampleRateLookup($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); } /* * @param int $index * * @return int\|false / public static function bitPerSampleLookup($index) { static $lookup = array( 0 => 16, 1 => 20, 2 => 24, 3 => 24, ); return (isset($lookup[$index]) ? $lookup[$index] : false); } /* * @param int $index * * @return int\|false / public static function numChannelsLookup($index) { switch ($index) { case 0: return 1; case 1: case 2: case 3: case 4: return 2; case 5: case 6: return 3; case 7: case 8: return 4; case 9: return 5; case 10: case 11: case 12: return 6; case 13: return 7; case 14: case 15: return 8; } return false; } /* * @param int $index * * @return string / public static function channelArrangementLookup($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'); } /* * @param int $index * @param int $version * * @return int\|false */ public static function dialogNormalization($index, $version) { switch ($version) { case 7: return 0 - $index; case 6: return 0 - 16 - $index; } return false; } }

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