ecommun / owncloud_ynh

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sources/3rdparty/getid3/module.audio.bonk.php 9.22 KB
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  <?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.la.php                                         //
  // module for analyzing BONK audio files                       //
  // dependencies: module.tag.id3v2.php (optional)               //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  
  class getid3_bonk extends getid3_handler
  {
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  	public function Analyze() {
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  		$info = &$this->getid3->info;
  
  		// shortcut
  		$info['bonk'] = array();
  		$thisfile_bonk        = &$info['bonk'];
  
  		$thisfile_bonk['dataoffset'] = $info['avdataoffset'];
  		$thisfile_bonk['dataend']    = $info['avdataend'];
  
  		if (!getid3_lib::intValueSupported($thisfile_bonk['dataend'])) {
  
  			$info['warning'][] = 'Unable to parse BONK file from end (v0.6+ preferred method) because PHP filesystem functions only support up to '.round(PHP_INT_MAX / 1073741824).'GB';
  
  		} else {
  
  			// scan-from-end method, for v0.6 and higher
  			fseek($this->getid3->fp, $thisfile_bonk['dataend'] - 8, SEEK_SET);
  			$PossibleBonkTag = fread($this->getid3->fp, 8);
  			while ($this->BonkIsValidTagName(substr($PossibleBonkTag, 4, 4), true)) {
  				$BonkTagSize = getid3_lib::LittleEndian2Int(substr($PossibleBonkTag, 0, 4));
  				fseek($this->getid3->fp, 0 - $BonkTagSize, SEEK_CUR);
  				$BonkTagOffset = ftell($this->getid3->fp);
  				$TagHeaderTest = fread($this->getid3->fp, 5);
  				if (($TagHeaderTest{0} != "\x00") || (substr($PossibleBonkTag, 4, 4) != strtolower(substr($PossibleBonkTag, 4, 4)))) {
  					$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes("\x00".strtoupper(substr($PossibleBonkTag, 4, 4))).'" at offset '.$BonkTagOffset.', found "'.getid3_lib::PrintHexBytes($TagHeaderTest).'"';
  					return false;
  				}
  				$BonkTagName = substr($TagHeaderTest, 1, 4);
  
  				$thisfile_bonk[$BonkTagName]['size']   = $BonkTagSize;
  				$thisfile_bonk[$BonkTagName]['offset'] = $BonkTagOffset;
  				$this->HandleBonkTags($BonkTagName);
  				$NextTagEndOffset = $BonkTagOffset - 8;
  				if ($NextTagEndOffset < $thisfile_bonk['dataoffset']) {
  					if (empty($info['audio']['encoder'])) {
  						$info['audio']['encoder'] = 'Extended BONK v0.9+';
  					}
  					return true;
  				}
  				fseek($this->getid3->fp, $NextTagEndOffset, SEEK_SET);
  				$PossibleBonkTag = fread($this->getid3->fp, 8);
  			}
  
  		}
  
  		// seek-from-beginning method for v0.4 and v0.5
  		if (empty($thisfile_bonk['BONK'])) {
  			fseek($this->getid3->fp, $thisfile_bonk['dataoffset'], SEEK_SET);
  			do {
  				$TagHeaderTest = fread($this->getid3->fp, 5);
  				switch ($TagHeaderTest) {
  					case "\x00".'BONK':
  						if (empty($info['audio']['encoder'])) {
  							$info['audio']['encoder'] = 'BONK v0.4';
  						}
  						break;
  
  					case "\x00".'INFO':
  						$info['audio']['encoder'] = 'Extended BONK v0.5';
  						break;
  
  					default:
  						break 2;
  				}
  				$BonkTagName = substr($TagHeaderTest, 1, 4);
  				$thisfile_bonk[$BonkTagName]['size']   = $thisfile_bonk['dataend'] - $thisfile_bonk['dataoffset'];
  				$thisfile_bonk[$BonkTagName]['offset'] = $thisfile_bonk['dataoffset'];
  				$this->HandleBonkTags($BonkTagName);
  
  			} while (true);
  		}
  
  		// parse META block for v0.6 - v0.8
  		if (empty($thisfile_bonk['INFO']) && isset($thisfile_bonk['META']['tags']['info'])) {
  			fseek($this->getid3->fp, $thisfile_bonk['META']['tags']['info'], SEEK_SET);
  			$TagHeaderTest = fread($this->getid3->fp, 5);
  			if ($TagHeaderTest == "\x00".'INFO') {
  				$info['audio']['encoder'] = 'Extended BONK v0.6 - v0.8';
  
  				$BonkTagName = substr($TagHeaderTest, 1, 4);
  				$thisfile_bonk[$BonkTagName]['size']   = $thisfile_bonk['dataend'] - $thisfile_bonk['dataoffset'];
  				$thisfile_bonk[$BonkTagName]['offset'] = $thisfile_bonk['dataoffset'];
  				$this->HandleBonkTags($BonkTagName);
  			}
  		}
  
  		if (empty($info['audio']['encoder'])) {
  			$info['audio']['encoder'] = 'Extended BONK v0.9+';
  		}
  		if (empty($thisfile_bonk['BONK'])) {
  			unset($info['bonk']);
  		}
  		return true;
  
  	}
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  	public function HandleBonkTags($BonkTagName) {
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  		$info = &$this->getid3->info;
  		switch ($BonkTagName) {
  			case 'BONK':
  				// shortcut
  				$thisfile_bonk_BONK = &$info['bonk']['BONK'];
  
  				$BonkData = "\x00".'BONK'.fread($this->getid3->fp, 17);
  				$thisfile_bonk_BONK['version']            =        getid3_lib::LittleEndian2Int(substr($BonkData,  5, 1));
  				$thisfile_bonk_BONK['number_samples']     =        getid3_lib::LittleEndian2Int(substr($BonkData,  6, 4));
  				$thisfile_bonk_BONK['sample_rate']        =        getid3_lib::LittleEndian2Int(substr($BonkData, 10, 4));
  
  				$thisfile_bonk_BONK['channels']           =        getid3_lib::LittleEndian2Int(substr($BonkData, 14, 1));
  				$thisfile_bonk_BONK['lossless']           = (bool) getid3_lib::LittleEndian2Int(substr($BonkData, 15, 1));
  				$thisfile_bonk_BONK['joint_stereo']       = (bool) getid3_lib::LittleEndian2Int(substr($BonkData, 16, 1));
  				$thisfile_bonk_BONK['number_taps']        =        getid3_lib::LittleEndian2Int(substr($BonkData, 17, 2));
  				$thisfile_bonk_BONK['downsampling_ratio'] =        getid3_lib::LittleEndian2Int(substr($BonkData, 19, 1));
  				$thisfile_bonk_BONK['samples_per_packet'] =        getid3_lib::LittleEndian2Int(substr($BonkData, 20, 2));
  
  				$info['avdataoffset'] = $thisfile_bonk_BONK['offset'] + 5 + 17;
  				$info['avdataend']    = $thisfile_bonk_BONK['offset'] + $thisfile_bonk_BONK['size'];
  
  				$info['fileformat']               = 'bonk';
  				$info['audio']['dataformat']      = 'bonk';
  				$info['audio']['bitrate_mode']    = 'vbr'; // assumed
  				$info['audio']['channels']        = $thisfile_bonk_BONK['channels'];
  				$info['audio']['sample_rate']     = $thisfile_bonk_BONK['sample_rate'];
  				$info['audio']['channelmode']     = ($thisfile_bonk_BONK['joint_stereo'] ? 'joint stereo' : 'stereo');
  				$info['audio']['lossless']        = $thisfile_bonk_BONK['lossless'];
  				$info['audio']['codec']           = 'bonk';
  
  				$info['playtime_seconds'] = $thisfile_bonk_BONK['number_samples'] / ($thisfile_bonk_BONK['sample_rate'] * $thisfile_bonk_BONK['channels']);
  				if ($info['playtime_seconds'] > 0) {
  					$info['audio']['bitrate'] = (($info['bonk']['dataend'] - $info['bonk']['dataoffset']) * 8) / $info['playtime_seconds'];
  				}
  				break;
  
  			case 'INFO':
  				// shortcut
  				$thisfile_bonk_INFO = &$info['bonk']['INFO'];
  
  				$thisfile_bonk_INFO['version'] = getid3_lib::LittleEndian2Int(fread($this->getid3->fp, 1));
  				$thisfile_bonk_INFO['entries_count'] = 0;
  				$NextInfoDataPair = fread($this->getid3->fp, 5);
  				if (!$this->BonkIsValidTagName(substr($NextInfoDataPair, 1, 4))) {
  					while (!feof($this->getid3->fp)) {
  						//$CurrentSeekInfo['offset']  = getid3_lib::LittleEndian2Int(substr($NextInfoDataPair, 0, 4));
  						//$CurrentSeekInfo['nextbit'] = getid3_lib::LittleEndian2Int(substr($NextInfoDataPair, 4, 1));
  						//$thisfile_bonk_INFO[] = $CurrentSeekInfo;
  
  						$NextInfoDataPair = fread($this->getid3->fp, 5);
  						if ($this->BonkIsValidTagName(substr($NextInfoDataPair, 1, 4))) {
  							fseek($this->getid3->fp, -5, SEEK_CUR);
  							break;
  						}
  						$thisfile_bonk_INFO['entries_count']++;
  					}
  				}
  				break;
  
  			case 'META':
  				$BonkData = "\x00".'META'.fread($this->getid3->fp, $info['bonk']['META']['size'] - 5);
  				$info['bonk']['META']['version'] = getid3_lib::LittleEndian2Int(substr($BonkData,  5, 1));
  
  				$MetaTagEntries = floor(((strlen($BonkData) - 8) - 6) / 8); // BonkData - xxxxmeta - ØMETA
  				$offset = 6;
  				for ($i = 0; $i < $MetaTagEntries; $i++) {
  					$MetaEntryTagName   =                              substr($BonkData, $offset, 4);
  					$offset += 4;
  					$MetaEntryTagOffset = getid3_lib::LittleEndian2Int(substr($BonkData, $offset, 4));
  					$offset += 4;
  					$info['bonk']['META']['tags'][$MetaEntryTagName] = $MetaEntryTagOffset;
  				}
  				break;
  
  			case ' ID3':
  				$info['audio']['encoder'] = 'Extended BONK v0.9+';
  
  				// ID3v2 checking is optional
  				if (class_exists('getid3_id3v2')) {
  					$getid3_temp = new getID3();
  					$getid3_temp->openfile($this->getid3->filename);
  					$getid3_id3v2 = new getid3_id3v2($getid3_temp);
  					$getid3_id3v2->StartingOffset = $info['bonk'][' ID3']['offset'] + 2;
  					$info['bonk'][' ID3']['valid'] = $getid3_id3v2->Analyze();
  					if ($info['bonk'][' ID3']['valid']) {
  						$info['id3v2'] = $getid3_temp->info['id3v2'];
  					}
  					unset($getid3_temp, $getid3_id3v2);
  				}
  				break;
  
  			default:
  				$info['warning'][] = 'Unexpected Bonk tag "'.$BonkTagName.'" at offset '.$info['bonk'][$BonkTagName]['offset'];
  				break;
  
  		}
  	}
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  	public static function BonkIsValidTagName($PossibleBonkTag, $ignorecase=false) {
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  		static $BonkIsValidTagName = array('BONK', 'INFO', ' ID3', 'META');
  		foreach ($BonkIsValidTagName as $validtagname) {
  			if ($validtagname == $PossibleBonkTag) {
  				return true;
  			} elseif ($ignorecase && (strtolower($validtagname) == strtolower($PossibleBonkTag))) {
  				return true;
  			}
  		}
  		return false;
  	}
  
  }