File indexing completed on 2024-05-12 17:26:00

 <?php
 /////////////////////////////////////////////////////////////////
 /// getID3() by James Heinrich <info@getid3.org>               //
 //  available at http://getid3.sourceforge.net                 //
 //            or http://www.getid3.org                         //
 //          also https://github.com/JamesHeinrich/getID3       //
 /////////////////////////////////////////////////////////////////
 // See readme.txt for more details                             //
 /////////////////////////////////////////////////////////////////
 //                                                             //
 // module.audio.vqf.php                                        //
 // module for analyzing VQF audio files                        //
 // dependencies: NONE                                          //
 //                                                            ///
 /////////////////////////////////////////////////////////////////
 
 
 class getid3_vqf extends getid3_handler
 {
   public function Analyze() {
     $info = &$this->getid3->info;
 
     // based loosely on code from TTwinVQ by Jurgen Faul <jfaulØgmx*de>
     // 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'];
 
     $this->fseek($info['avdataoffset']);
     $VQFheaderData = $this->fread(16);
 
     $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;
 
     while ($this->ftell() < $info['avdataend']) {
 
       $ChunkBaseOffset = $this->ftell();
       $chunkoffset = 0;
       $ChunkData = $this->fread(8);
       $ChunkName = substr($ChunkData, $chunkoffset, 4);
       if ($ChunkName == 'DATA') {
         $info['avdataoffset'] = $ChunkBaseOffset;
         break;
       }
       $chunkoffset += 4;
       $ChunkSize = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
       $chunkoffset += 4;
       if ($ChunkSize > ($info['avdataend'] - $this->ftell())) {
         $info['error'][] = 'Invalid chunk size ('.$ChunkSize.') for chunk "'.$ChunkName.'" at offset '.$ChunkBaseOffset;
         break;
       }
       if ($ChunkSize > 0) {
         $ChunkData .= $this->fread($ChunkSize);
       }
 
       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;
   }
 
   public function VQFchannelFrequencyLookup($frequencyid) {
     static $VQFchannelFrequencyLookup = array(
       11 => 11025,
       22 => 22050,
       44 => 44100
     );
     return (isset($VQFchannelFrequencyLookup[$frequencyid]) ? $VQFchannelFrequencyLookup[$frequencyid] : $frequencyid * 1000);
   }
 
   public function VQFcommentNiceNameLookup($shortname) {
     static $VQFcommentNiceNameLookup = array(
       'NAME' => 'title',
       'AUTH' => 'artist',
       '(c) ' => 'copyright',
       'FILE' => 'filename',
       'COMT' => 'comment',
       'ALBM' => 'album'
     );
     return (isset($VQFcommentNiceNameLookup[$shortname]) ? $VQFcommentNiceNameLookup[$shortname] : $shortname);
   }
 
 }