<?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.flac.php // // module for analyzing FLAC and OggFLAC audio files // // dependencies: module.audio.ogg.php // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true); /** * @tutorial http://flac.sourceforge.net/format.html */ class getid3_flac extends getid3_handler { const syncword = 'fLaC'; /** * @return bool */ public function Analyze() { $info = &$this->getid3->info; $this->fseek($info['avdataoffset']); $StreamMarker = $this->fread(4); if ($StreamMarker != self::syncword) { return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($StreamMarker).'"'); } $info['fileformat'] = 'flac'; $info['audio']['dataformat'] = 'flac'; $info['audio']['bitrate_mode'] = 'vbr'; $info['audio']['lossless'] = true; // parse flac container return $this->parseMETAdata(); } /** * @return bool */ public function parseMETAdata() { $info = &$this->getid3->info; do { $BlockOffset = $this->ftell(); $BlockHeader = $this->fread(4); $LBFBT = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1)); // LBFBT = LastBlockFlag + BlockType $LastBlockFlag = (bool) ($LBFBT & 0x80); $BlockType = ($LBFBT & 0x7F); $BlockLength = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3)); $BlockTypeText = self::metaBlockTypeLookup($BlockType); if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) { $this->warning('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file'); break; } if ($BlockLength < 1) { if ($BlockTypeText != 'reserved') { // probably supposed to be zero-length $this->warning('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockTypeText.') at offset '.$BlockOffset.' is zero bytes'); continue; } $this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid'); break; } $info['flac'][$BlockTypeText]['raw'] = array(); $BlockTypeText_raw = &$info['flac'][$BlockTypeText]['raw']; $BlockTypeText_raw['offset'] = $BlockOffset; $BlockTypeText_raw['last_meta_block'] = $LastBlockFlag; $BlockTypeText_raw['block_type'] = $BlockType; $BlockTypeText_raw['block_type_text'] = $BlockTypeText; $BlockTypeText_raw['block_length'] = $BlockLength; if ($BlockTypeText_raw['block_type'] != 0x06) { // do not read attachment data automatically $BlockTypeText_raw['block_data'] = $this->fread($BlockLength); } switch ($BlockTypeText) { case 'STREAMINFO': // 0x00 if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) { return false; } break; case 'PADDING': // 0x01 unset($info['flac']['PADDING']); // ignore break; case 'APPLICATION': // 0x02 if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) { return false; } break; case 'SEEKTABLE': // 0x03 if (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) { return false; } break; case 'VORBIS_COMMENT': // 0x04 if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) { return false; } break; case 'CUESHEET': // 0x05 if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) { return false; } break; case 'PICTURE': // 0x06 if (!$this->parsePICTURE()) { return false; } break; default: $this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockType.') at offset '.$BlockOffset); } unset($info['flac'][$BlockTypeText]['raw']); $info['avdataoffset'] = $this->ftell(); } while ($LastBlockFlag === false); // handle tags if (!empty($info['flac']['VORBIS_COMMENT']['comments'])) { $info['flac']['comments'] = $info['flac']['VORBIS_COMMENT']['comments']; } if (!empty($info['flac']['VORBIS_COMMENT']['vendor'])) { $info['audio']['encoder'] = str_replace('reference ', '', $info['flac']['VORBIS_COMMENT']['vendor']); } // copy attachments to 'comments' array if nesesary if (isset($info['flac']['PICTURE']) && ($this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE)) { foreach ($info['flac']['PICTURE'] as $entry) { if (!empty($entry['data'])) { if (!isset($info['flac']['comments']['picture'])) { $info['flac']['comments']['picture'] = array(); } $comments_picture_data = array(); foreach (array('data', 'image_mime', 'image_width', 'image_height', 'imagetype', 'picturetype', 'description', 'datalength') as $picture_key) { if (isset($entry[$picture_key])) { $comments_picture_data[$picture_key] = $entry[$picture_key]; } } $info['flac']['comments']['picture'][] = $comments_picture_data; unset($comments_picture_data); } } } if (isset($info['flac']['STREAMINFO'])) { if (!$this->isDependencyFor('matroska')) { $info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset']; } $info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8); if ($info['flac']['uncompressed_audio_bytes'] == 0) { return $this->error('Corrupt FLAC file: uncompressed_audio_bytes == zero'); } if (!empty($info['flac']['compressed_audio_bytes'])) { $info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes']; } } // set md5_data_source - built into flac 0.5+ if (isset($info['flac']['STREAMINFO']['audio_signature'])) { if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) { $this->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)'); } else { $info['md5_data_source'] = ''; $md5 = $info['flac']['STREAMINFO']['audio_signature']; for ($i = 0; $i < strlen($md5); $i++) { $info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT); } if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) { unset($info['md5_data_source']); } } } if (isset($info['flac']['STREAMINFO']['bits_per_sample'])) { $info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample']; if ($info['audio']['bits_per_sample'] == 8) { // special case // must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value // MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed $this->warning('FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file'); } } return true; } /** * @param string $BlockData * * @return array */ public static function parseSTREAMINFOdata($BlockData) { $streaminfo = array(); $streaminfo['min_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 0, 2)); $streaminfo['max_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 2, 2)); $streaminfo['min_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 4, 3)); $streaminfo['max_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 7, 3)); $SRCSBSS = getid3_lib::BigEndian2Bin(substr($BlockData, 10, 8)); $streaminfo['sample_rate'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 0, 20)); $streaminfo['channels'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 20, 3)) + 1; $streaminfo['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 23, 5)) + 1; $streaminfo['samples_stream'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 28, 36)); $streaminfo['audio_signature'] = substr($BlockData, 18, 16); return $streaminfo; } /** * @param string $BlockData * * @return bool */ private function parseSTREAMINFO($BlockData) { $info = &$this->getid3->info; $info['flac']['STREAMINFO'] = self::parseSTREAMINFOdata($BlockData); if (!empty($info['flac']['STREAMINFO']['sample_rate'])) { $info['audio']['bitrate_mode'] = 'vbr'; $info['audio']['sample_rate'] = $info['flac']['STREAMINFO']['sample_rate']; $info['audio']['channels'] = $info['flac']['STREAMINFO']['channels']; $info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample']; $info['playtime_seconds'] = $info['flac']['STREAMINFO']['samples_stream'] / $info['flac']['STREAMINFO']['sample_rate']; if ($info['playtime_seconds'] > 0) { if (!$this->isDependencyFor('matroska')) { $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds']; } else { $this->warning('Cannot determine audio bitrate because total stream size is unknown'); } } } else { return $this->error('Corrupt METAdata block: STREAMINFO'); } return true; } /** * @param string $BlockData * * @return bool */ private function parseAPPLICATION($BlockData) { $info = &$this->getid3->info; $ApplicationID = getid3_lib::BigEndian2Int(substr($BlockData, 0, 4)); $info['flac']['APPLICATION'][$ApplicationID]['name'] = self::applicationIDLookup($ApplicationID); $info['flac']['APPLICATION'][$ApplicationID]['data'] = substr($BlockData, 4); return true; } /** * @param string $BlockData * * @return bool */ private function parseSEEKTABLE($BlockData) { $info = &$this->getid3->info; $offset = 0; $BlockLength = strlen($BlockData); $placeholderpattern = str_repeat("\xFF", 8); while ($offset < $BlockLength) { $SampleNumberString = substr($BlockData, $offset, 8); $offset += 8; if ($SampleNumberString == $placeholderpattern) { // placeholder point getid3_lib::safe_inc($info['flac']['SEEKTABLE']['placeholders'], 1); $offset += 10; } else { $SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString); $info['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); $offset += 8; $info['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 2)); $offset += 2; } } return true; } /** * @param string $BlockData * * @return bool */ private function parseVORBIS_COMMENT($BlockData) { $info = &$this->getid3->info; $getid3_ogg = new getid3_ogg($this->getid3); if ($this->isDependencyFor('matroska')) { $getid3_ogg->setStringMode($this->data_string); } $getid3_ogg->ParseVorbisComments(); if (isset($info['ogg'])) { unset($info['ogg']['comments_raw']); $info['flac']['VORBIS_COMMENT'] = $info['ogg']; unset($info['ogg']); } unset($getid3_ogg); return true; } /** * @param string $BlockData * * @return bool */ private function parseCUESHEET($BlockData) { $info = &$this->getid3->info; $offset = 0; $info['flac']['CUESHEET']['media_catalog_number'] = trim(substr($BlockData, $offset, 128), "\0"); $offset += 128; $info['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); $offset += 8; $info['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)) & 0x80); $offset += 1; $offset += 258; // reserved $info['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); $offset += 1; for ($track = 0; $track < $info['flac']['CUESHEET']['number_tracks']; $track++) { $TrackSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); $offset += 8; $TrackNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); $offset += 1; $info['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset; $info['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($BlockData, $offset, 12); $offset += 12; $TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); $offset += 1; $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80); $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40); $offset += 13; // reserved $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); $offset += 1; for ($index = 0; $index < $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) { $IndexSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); $offset += 8; $IndexNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); $offset += 1; $offset += 3; // reserved $info['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset; } } return true; } /** * Parse METADATA_BLOCK_PICTURE flac structure and extract attachment * External usage: audio.ogg * * @return bool */ public function parsePICTURE() { $info = &$this->getid3->info; $picture = array(); $picture['typeid'] = getid3_lib::BigEndian2Int($this->fread(4)); $picture['picturetype'] = self::pictureTypeLookup($picture['typeid']); $picture['image_mime'] = $this->fread(getid3_lib::BigEndian2Int($this->fread(4))); $descr_length = getid3_lib::BigEndian2Int($this->fread(4)); if ($descr_length) { $picture['description'] = $this->fread($descr_length); } $picture['image_width'] = getid3_lib::BigEndian2Int($this->fread(4)); $picture['image_height'] = getid3_lib::BigEndian2Int($this->fread(4)); $picture['color_depth'] = getid3_lib::BigEndian2Int($this->fread(4)); $picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4)); $picture['datalength'] = getid3_lib::BigEndian2Int($this->fread(4)); if ($picture['image_mime'] == '-->') { $picture['data'] = $this->fread($picture['datalength']); } else { $picture['data'] = $this->saveAttachment( str_replace('/', '_', $picture['picturetype']).'_'.$this->ftell(), $this->ftell(), $picture['datalength'], $picture['image_mime']); } $info['flac']['PICTURE'][] = $picture; return true; } /** * @param int $blocktype * * @return string */ public static function metaBlockTypeLookup($blocktype) { static $lookup = array( 0 => 'STREAMINFO', 1 => 'PADDING', 2 => 'APPLICATION', 3 => 'SEEKTABLE', 4 => 'VORBIS_COMMENT', 5 => 'CUESHEET', 6 => 'PICTURE', ); return (isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved'); } /** * @param int $applicationid * * @return string */ public static function applicationIDLookup($applicationid) { // http://flac.sourceforge.net/id.html static $lookup = array( 0x41544348 => 'FlacFile', // "ATCH" 0x42534F4C => 'beSolo', // "BSOL" 0x42554753 => 'Bugs Player', // "BUGS" 0x43756573 => 'GoldWave cue points (specification)', // "Cues" 0x46696361 => 'CUE Splitter', // "Fica" 0x46746F6C => 'flac-tools', // "Ftol" 0x4D4F5442 => 'MOTB MetaCzar', // "MOTB" 0x4D505345 => 'MP3 Stream Editor', // "MPSE" 0x4D754D4C => 'MusicML: Music Metadata Language', // "MuML" 0x52494646 => 'Sound Devices RIFF chunk storage', // "RIFF" 0x5346464C => 'Sound Font FLAC', // "SFFL" 0x534F4E59 => 'Sony Creative Software', // "SONY" 0x5351455A => 'flacsqueeze', // "SQEZ" 0x54745776 => 'TwistedWave', // "TtWv" 0x55495453 => 'UITS Embedding tools', // "UITS" 0x61696666 => 'FLAC AIFF chunk storage', // "aiff" 0x696D6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks', // "imag" 0x7065656D => 'Parseable Embedded Extensible Metadata (specification)', // "peem" 0x71667374 => 'QFLAC Studio', // "qfst" 0x72696666 => 'FLAC RIFF chunk storage', // "riff" 0x74756E65 => 'TagTuner', // "tune" 0x78626174 => 'XBAT', // "xbat" 0x786D6364 => 'xmcd', // "xmcd" ); return (isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved'); } /** * @param int $type_id * * @return string */ public static function pictureTypeLookup($type_id) { static $lookup = array ( 0 => 'Other', 1 => '32x32 pixels \'file icon\' (PNG only)', 2 => 'Other file icon', 3 => 'Cover (front)', 4 => 'Cover (back)', 5 => 'Leaflet page', 6 => 'Media (e.g. label side of CD)', 7 => 'Lead artist/lead performer/soloist', 8 => 'Artist/performer', 9 => 'Conductor', 10 => 'Band/Orchestra', 11 => 'Composer', 12 => 'Lyricist/text writer', 13 => 'Recording Location', 14 => 'During recording', 15 => 'During performance', 16 => 'Movie/video screen capture', 17 => 'A bright coloured fish', 18 => 'Illustration', 19 => 'Band/artist logotype', 20 => 'Publisher/Studio logotype', ); return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved'); } }

ميديا

“ألعاب الواقع الافتراضي: رحلة إلى عوالم تفاعلية غامرة”

يونيو 12, 2025

2٬173 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.