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

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.rkau.php  >  Download  
File: includes/getid3/module.audio.rkau.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: 1 year ago
Size: 4,294 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.shorten.php                                    //
// module for analyzing Shorten Audio files                    //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_rkau extends getid3_handler
{

    function 
Analyze() {
        
$info = &$this->getid3->info;

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$RKAUHeader fread($this->getid3->fp20);
        
$magic 'RKA';
        if (
substr($RKAUHeader03) != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($RKAUHeader03)).'"';
            return 
false;
        }

        
$info['fileformat']            = 'rkau';
        
$info['audio']['dataformat']   = 'rkau';
        
$info['audio']['bitrate_mode'] = 'vbr';

        
$info['rkau']['raw']['version']   = getid3_lib::LittleEndian2Int(substr($RKAUHeader31));
        
$info['rkau']['version']          = '1.'.str_pad($info['rkau']['raw']['version'] & 0x0F2'0'STR_PAD_LEFT);
        if ((
$info['rkau']['version'] > 1.07) || ($info['rkau']['version'] < 1.06)) {
            
$info['error'][] = 'This version of getID3() ['.$this->getid3->version().'] can only parse RKAU files v1.06 and 1.07 (this file is v'.$info['rkau']['version'].')';
            unset(
$info['rkau']);
            return 
false;
        }

        
$info['rkau']['source_bytes']     = getid3_lib::LittleEndian2Int(substr($RKAUHeader,  44));
        
$info['rkau']['sample_rate']      = getid3_lib::LittleEndian2Int(substr($RKAUHeader,  84));
        
$info['rkau']['channels']         = getid3_lib::LittleEndian2Int(substr($RKAUHeader121));
        
$info['rkau']['bits_per_sample']  = getid3_lib::LittleEndian2Int(substr($RKAUHeader131));

        
$info['rkau']['raw']['quality']   = getid3_lib::LittleEndian2Int(substr($RKAUHeader141));
        
$this->RKAUqualityLookup($info['rkau']);

        
$info['rkau']['raw']['flags']            = getid3_lib::LittleEndian2Int(substr($RKAUHeader151));
        
$info['rkau']['flags']['joint_stereo']   = (bool) (!($info['rkau']['raw']['flags'] & 0x01));
        
$info['rkau']['flags']['streaming']      =  (bool)  ($info['rkau']['raw']['flags'] & 0x02);
        
$info['rkau']['flags']['vrq_lossy_mode'] =  (bool)  ($info['rkau']['raw']['flags'] & 0x04);

        if (
$info['rkau']['flags']['streaming']) {
            
$info['avdataoffset'] += 20;
            
$info['rkau']['compressed_bytes']  = getid3_lib::LittleEndian2Int(substr($RKAUHeader164));
        } else {
            
$info['avdataoffset'] += 16;
            
$info['rkau']['compressed_bytes'] = $info['avdataend'] - $info['avdataoffset'] - 1;
        }
        
// Note: compressed_bytes does not always equal what appears to be the actual number of compressed bytes,
        // sometimes it's more, sometimes less. No idea why(?)

        
$info['audio']['lossless']        = $info['rkau']['lossless'];
        
$info['audio']['channels']        = $info['rkau']['channels'];
        
$info['audio']['bits_per_sample'] = $info['rkau']['bits_per_sample'];
        
$info['audio']['sample_rate']     = $info['rkau']['sample_rate'];

        
$info['playtime_seconds']         = $info['rkau']['source_bytes'] / ($info['rkau']['sample_rate'] * $info['rkau']['channels'] * ($info['rkau']['bits_per_sample'] / 8));
        
$info['audio']['bitrate']         = ($info['rkau']['compressed_bytes'] * 8) / $info['playtime_seconds'];

        return 
true;

    }


    function 
RKAUqualityLookup(&$RKAUdata) {
        
$level   = ($RKAUdata['raw']['quality'] & 0xF0) >> 4;
        
$quality =  $RKAUdata['raw']['quality'] & 0x0F;

        
$RKAUdata['lossless']          = (($quality == 0) ? true false);
        
$RKAUdata['compression_level'] = $level 1;
        if (!
$RKAUdata['lossless']) {
            
$RKAUdata['quality_setting'] = $quality;
        }

        return 
true;
    }

}

?>