Mercurial > judyates
view e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.vqf.php @ 20:1038db2374ec judyates
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| author | Robert McIntyre <rlm@mit.edu> |
|---|---|
| date | Sun, 08 Sep 2013 00:47:09 -0400 |
| parents | 3f6b44aa6b35 |
| children |
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1 <?php2 // +----------------------------------------------------------------------+3 // | PHP version 5 |4 // +----------------------------------------------------------------------+5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |6 // +----------------------------------------------------------------------+7 // | This source file is subject to version 2 of the GPL license, |8 // | that is bundled with this package in the file license.txt and is |9 // | available through the world-wide-web at the following url: |10 // | http://www.gnu.org/copyleft/gpl.html |11 // +----------------------------------------------------------------------+12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |13 // +----------------------------------------------------------------------+14 // | Authors: James Heinrich <infoØgetid3*org> |15 // | Allan Hansen <ahØartemis*dk> |16 // +----------------------------------------------------------------------+17 // | module.audio.vqf.php |18 // | Module for analyzing VQF Audio files |19 // | dependencies: NONE |20 // +----------------------------------------------------------------------+21 //22 // $Id: module.audio.vqf.php,v 1.3 2006/11/16 23:16:31 ah Exp $26 class getid3_vqf extends getid3_handler27 {29 public function Analyze() {31 $getid3 = $this->getid3;33 // based loosely on code from TTwinVQ by Jurgen Faul <jfaulØgmx*de>34 // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html36 $getid3->info['fileformat'] = 'vqf';37 $getid3->info['audio']['dataformat'] = 'vqf';38 $getid3->info['audio']['bitrate_mode'] = 'cbr';39 $getid3->info['audio']['lossless'] = false;41 // Shortcuts42 $getid3->info['vqf']['raw'] = array ();43 $info_vqf = &$getid3->info['vqf'];44 $info_vqf_raw = &$info_vqf['raw'];46 // Get header47 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);48 $vqf_header_data = fread($getid3->fp, 16);50 $info_vqf_raw['header_tag'] = 'TWIN'; // Magic bytes51 $info_vqf_raw['version'] = substr($vqf_header_data, 4, 8);52 $info_vqf_raw['size'] = getid3_lib::BigEndian2Int(substr($vqf_header_data, 12, 4));54 while (ftell($getid3->fp) < $getid3->info['avdataend']) {56 $chunk_base_offset = ftell($getid3->fp);57 $chunk_data = fread($getid3->fp, 8);58 $chunk_name = substr($chunk_data, 0, 4);60 if ($chunk_name == 'DATA') {61 $getid3->info['avdataoffset'] = $chunk_base_offset;62 break;63 }65 $chunk_size = getid3_lib::BigEndian2Int(substr($chunk_data, 4, 4));66 if ($chunk_size > ($getid3->info['avdataend'] - ftell($getid3->fp))) {67 throw new getid3_exception('Invalid chunk size ('.$chunk_size.') for chunk "'.$chunk_name.'" at offset 8.');68 }69 if ($chunk_size > 0) {70 $chunk_data .= fread($getid3->fp, $chunk_size);71 }73 switch ($chunk_name) {75 case 'COMM':76 $info_vqf['COMM'] = array ();77 getid3_lib::ReadSequence('BigEndian2Int', $info_vqf['COMM'], $chunk_data, 8,78 array (79 'channel_mode' => 4,80 'bitrate' => 4,81 'sample_rate' => 4,82 'security_level' => 483 )84 );86 $getid3->info['audio']['channels'] = $info_vqf['COMM']['channel_mode'] + 1;87 $getid3->info['audio']['sample_rate'] = getid3_vqf::VQFchannelFrequencyLookup($info_vqf['COMM']['sample_rate']);88 $getid3->info['audio']['bitrate'] = $info_vqf['COMM']['bitrate'] * 1000;89 $getid3->info['audio']['encoder_options'] = 'CBR' . ceil($getid3->info['audio']['bitrate']/1000);91 if ($getid3->info['audio']['bitrate'] == 0) {92 throw new getid3_exception('Corrupt VQF file: bitrate_audio == zero');93 }94 break;96 case 'NAME':97 case 'AUTH':98 case '(c) ':99 case 'FILE':100 case 'COMT':101 case 'ALBM':102 $info_vqf['comments'][getid3_vqf::VQFcommentNiceNameLookup($chunk_name)][] = trim(substr($chunk_data, 8));103 break;105 case 'DSIZ':106 $info_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($chunk_data, 8, 4));107 break;109 default:110 $getid3->warning('Unhandled chunk type "'.$chunk_name.'" at offset 8');111 break;112 }113 }115 $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate'];117 if (isset($info_vqf['DSIZ']) && (($info_vqf['DSIZ'] != ($getid3->info['avdataend'] - $getid3->info['avdataoffset'] - strlen('DATA'))))) {118 switch ($info_vqf['DSIZ']) {119 case 0:120 case 1:121 $getid3->warning('Invalid DSIZ value "'.$info_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'.($info_vqf['DSIZ'] + 1).'.0');122 $getid3->info['audio']['encoder'] = 'Ahead Nero';123 break;125 default:126 $getid3->warning('Probable corrupted file - should be '.$info_vqf['DSIZ'].' bytes, actually '.($getid3->info['avdataend'] - $getid3->info['avdataoffset'] - strlen('DATA')));127 break;128 }129 }131 return true;132 }136 public static function VQFchannelFrequencyLookup($frequencyid) {138 static $lookup = array (139 11 => 11025,140 22 => 22050,141 44 => 44100142 );143 return (isset($lookup[$frequencyid]) ? $lookup[$frequencyid] : $frequencyid * 1000);144 }148 public static function VQFcommentNiceNameLookup($shortname) {150 static $lookup = array (151 'NAME' => 'title',152 'AUTH' => 'artist',153 '(c) ' => 'copyright',154 'FILE' => 'filename',155 'COMT' => 'comment',156 'ALBM' => 'album'157 );158 return (isset($lookup[$shortname]) ? $lookup[$shortname] : $shortname);159 }161 }164 ?>