<?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 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; } /** * @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; } }

ميديا

“ألعاب الواقع الافتراضي: رحلة إلى عوالم تفاعلية غامرة”

يونيو 12, 2025

1٬691 أقل من دقيقة

في هذا التقرير المصور، نأخذك في جولة بصرية داخل عالم ألعاب الواقع الافتراضي (VR)، حيث تندمج التكنولوجيا مع الترفيه لخلق تجارب لا مثيل لها. من خلال نظارات الواقع الافتراضي المتطورة، يمكن للاعبين التفاعل مع بيئات ثلاثية الأبعاد، مما يتيح لهم الانغماس الكامل في الألعاب. سنستعرض أبرز الألعاب المتاحة، مثل “Beat Saber” و”Half-Life: Alyx”، التي تقدم تجارب تفاعلية مبتكرة. كما نسلط الضوء على التحديات التي تواجه هذه التقنية، مثل التكلفة المرتفعة ومشاكل الراحة أثناء الاستخدام الطويل. انضم إلينا لاكتشاف كيف يُعيد الواقع الافتراضي تعريف مفهوم اللعب ويشكل مستقبل صناعة الألعاب.