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sources/3rdparty/james-heinrich/getid3/getid3/module.audio.vqf.php 5.88 KB
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  <?php
  /////////////////////////////////////////////////////////////////
  /// getID3() by James Heinrich <info@getid3.org>               //
  //  available at http://getid3.sourceforge.net                 //
  //            or http://www.getid3.org                         //
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  //          also https://github.com/JamesHeinrich/getID3       //
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  /////////////////////////////////////////////////////////////////
  // See readme.txt for more details                             //
  /////////////////////////////////////////////////////////////////
  //                                                             //
  // module.audio.vqf.php                                        //
  // module for analyzing VQF audio files                        //
  // dependencies: NONE                                          //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  
  class getid3_vqf extends getid3_handler
  {
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  	public function Analyze() {
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  		$info = &$this->getid3->info;
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  		// based loosely on code from TTwinVQ by Jurgen Faul <jfaulØgmx*de>
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  		// http://jfaul.de/atl  or  http://j-faul.virtualave.net/atl/atl.html
  
  		$info['fileformat']            = 'vqf';
  		$info['audio']['dataformat']   = 'vqf';
  		$info['audio']['bitrate_mode'] = 'cbr';
  		$info['audio']['lossless']     = false;
  
  		// shortcut
  		$info['vqf']['raw'] = array();
  		$thisfile_vqf               = &$info['vqf'];
  		$thisfile_vqf_raw           = &$thisfile_vqf['raw'];
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  		$this->fseek($info['avdataoffset']);
  		$VQFheaderData = $this->fread(16);
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  		$offset = 0;
  		$thisfile_vqf_raw['header_tag'] = substr($VQFheaderData, $offset, 4);
  		$magic = 'TWIN';
  		if ($thisfile_vqf_raw['header_tag'] != $magic) {
  			$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_vqf_raw['header_tag']).'"';
  			unset($info['vqf']);
  			unset($info['fileformat']);
  			return false;
  		}
  		$offset += 4;
  		$thisfile_vqf_raw['version'] =                           substr($VQFheaderData, $offset, 8);
  		$offset += 8;
  		$thisfile_vqf_raw['size']    = getid3_lib::BigEndian2Int(substr($VQFheaderData, $offset, 4));
  		$offset += 4;
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  		while ($this->ftell() < $info['avdataend']) {
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  			$ChunkBaseOffset = $this->ftell();









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  			$chunkoffset = 0;









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  			$ChunkData = $this->fread(8);









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  			$ChunkName = substr($ChunkData, $chunkoffset, 4);
  			if ($ChunkName == 'DATA') {
  				$info['avdataoffset'] = $ChunkBaseOffset;
  				break;
  			}
  			$chunkoffset += 4;
  			$ChunkSize = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
  			$chunkoffset += 4;









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  			if ($ChunkSize > ($info['avdataend'] - $this->ftell())) {









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  				$info['error'][] = 'Invalid chunk size ('.$ChunkSize.') for chunk "'.$ChunkName.'" at offset '.$ChunkBaseOffset;
  				break;
  			}
  			if ($ChunkSize > 0) {









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  				$ChunkData .= $this->fread($ChunkSize);









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  			}
  
  			switch ($ChunkName) {
  				case 'COMM':
  					// shortcut
  					$thisfile_vqf['COMM'] = array();
  					$thisfile_vqf_COMM    = &$thisfile_vqf['COMM'];
  
  					$thisfile_vqf_COMM['channel_mode']   = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
  					$chunkoffset += 4;
  					$thisfile_vqf_COMM['bitrate']        = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
  					$chunkoffset += 4;
  					$thisfile_vqf_COMM['sample_rate']    = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
  					$chunkoffset += 4;
  					$thisfile_vqf_COMM['security_level'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
  					$chunkoffset += 4;
  
  					$info['audio']['channels']        = $thisfile_vqf_COMM['channel_mode'] + 1;
  					$info['audio']['sample_rate']     = $this->VQFchannelFrequencyLookup($thisfile_vqf_COMM['sample_rate']);
  					$info['audio']['bitrate']         = $thisfile_vqf_COMM['bitrate'] * 1000;
  					$info['audio']['encoder_options'] = 'CBR' . ceil($info['audio']['bitrate']/1000);
  
  					if ($info['audio']['bitrate'] == 0) {
  						$info['error'][] = 'Corrupt VQF file: bitrate_audio == zero';
  						return false;
  					}
  					break;
  
  				case 'NAME':
  				case 'AUTH':
  				case '(c) ':
  				case 'FILE':
  				case 'COMT':
  				case 'ALBM':
  					$thisfile_vqf['comments'][$this->VQFcommentNiceNameLookup($ChunkName)][] = trim(substr($ChunkData, 8));
  					break;
  
  				case 'DSIZ':
  					$thisfile_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($ChunkData, 8, 4));
  					break;
  
  				default:
  					$info['warning'][] = 'Unhandled chunk type "'.$ChunkName.'" at offset '.$ChunkBaseOffset;
  					break;
  			}
  		}
  
  		$info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['audio']['bitrate'];
  
  		if (isset($thisfile_vqf['DSIZ']) && (($thisfile_vqf['DSIZ'] != ($info['avdataend'] - $info['avdataoffset'] - strlen('DATA'))))) {
  			switch ($thisfile_vqf['DSIZ']) {
  				case 0:
  				case 1:
  					$info['warning'][] = 'Invalid DSIZ value "'.$thisfile_vqf['DSIZ'].'". This is known to happen with VQF files encoded by Ahead Nero, and seems to be its way of saying this is TwinVQF v'.($thisfile_vqf['DSIZ'] + 1).'.0';
  					$info['audio']['encoder'] = 'Ahead Nero';
  					break;
  
  				default:
  					$info['warning'][] = 'Probable corrupted file - should be '.$thisfile_vqf['DSIZ'].' bytes, actually '.($info['avdataend'] - $info['avdataoffset'] - strlen('DATA'));
  					break;
  			}
  		}
  
  		return true;
  	}









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  	public function VQFchannelFrequencyLookup($frequencyid) {









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  		static $VQFchannelFrequencyLookup = array(
  			11 => 11025,
  			22 => 22050,
  			44 => 44100
  		);
  		return (isset($VQFchannelFrequencyLookup[$frequencyid]) ? $VQFchannelFrequencyLookup[$frequencyid] : $frequencyid * 1000);
  	}









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  	public function VQFcommentNiceNameLookup($shortname) {









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  		static $VQFcommentNiceNameLookup = array(
  			'NAME' => 'title',
  			'AUTH' => 'artist',
  			'(c) ' => 'copyright',
  			'FILE' => 'filename',
  			'COMT' => 'comment',
  			'ALBM' => 'album'
  		);
  		return (isset($VQFcommentNiceNameLookup[$shortname]) ? $VQFcommentNiceNameLookup[$shortname] : $shortname);
  	}
  
  }