Login   Register  
PHP Classes
elePHPant
Icontem

File: includes/getid3/module.audio.vqf.php

Recommend this page to a friend!
Stumble It! Stumble It! Bookmark in del.icio.us Bookmark in del.icio.us
  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.vqf.php  >  Download  
File: includes/getid3/module.audio.vqf.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 2013-03-10 14:17
Size: 6,029 bytes
 

Contents

Class file image Download
<?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.vqf.php                                        //
// module for analyzing VQF audio files                        //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_vqf extends getid3_handler
{
    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'];

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$VQFheaderData fread($this->getid3->fp16);

        
$offset 0;
        
$thisfile_vqf_raw['header_tag'] = substr($VQFheaderData$offset4);
        
$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$offset8);
        
$offset += 8;
        
$thisfile_vqf_raw['size']    = getid3_lib::BigEndian2Int(substr($VQFheaderData$offset4));
        
$offset += 4;

        while (
ftell($this->getid3->fp) < $info['avdataend']) {

            
$ChunkBaseOffset ftell($this->getid3->fp);
            
$chunkoffset 0;
            
$ChunkData fread($this->getid3->fp8);
            
$ChunkName substr($ChunkData$chunkoffset4);
            if (
$ChunkName == 'DATA') {
                
$info['avdataoffset'] = $ChunkBaseOffset;
                break;
            }
            
$chunkoffset += 4;
            
$ChunkSize getid3_lib::BigEndian2Int(substr($ChunkData$chunkoffset4));
            
$chunkoffset += 4;
            if (
$ChunkSize > ($info['avdataend'] - ftell($this->getid3->fp))) {
                
$info['error'][] = 'Invalid chunk size ('.$ChunkSize.') for chunk "'.$ChunkName.'" at offset '.$ChunkBaseOffset;
                break;
            }
            if (
$ChunkSize 0) {
                
$ChunkData .= fread($this->getid3->fp$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$chunkoffset4));
                    
$chunkoffset += 4;
                    
$thisfile_vqf_COMM['bitrate']        = getid3_lib::BigEndian2Int(substr($ChunkData$chunkoffset4));
                    
$chunkoffset += 4;
                    
$thisfile_vqf_COMM['sample_rate']    = getid3_lib::BigEndian2Int(substr($ChunkData$chunkoffset4));
                    
$chunkoffset += 4;
                    
$thisfile_vqf_COMM['security_level'] = getid3_lib::BigEndian2Int(substr($ChunkData$chunkoffset4));
                    
$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($ChunkName)][] = trim(substr($ChunkData8));
                    break;

                case 
'DSIZ':
                    
$thisfile_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($ChunkData84));
                    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;
    }

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

    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);
    }

}


?>