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

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.tta.php  >  Download  
File: includes/getid3/module.audio.tta.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: 5,426 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.tta.php                                        //
// module for analyzing TTA Audio files                        //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_tta extends getid3_handler
{

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

        
$info['fileformat']            = 'tta';
        
$info['audio']['dataformat']   = 'tta';
        
$info['audio']['lossless']     = true;
        
$info['audio']['bitrate_mode'] = 'vbr';

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$ttaheader fread($this->getid3->fp26);

        
$info['tta']['magic'] = substr($ttaheader03);
        
$magic 'TTA';
        if (
$info['tta']['magic'] != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['tta']['magic']).'"';
            unset(
$info['fileformat']);
            unset(
$info['audio']);
            unset(
$info['tta']);
            return 
false;
        }

        switch (
$ttaheader{3}) {
            case 
"\x01"// TTA v1.x
            
case "\x02"// TTA v1.x
            
case "\x03"// TTA v1.x
                // "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."
                
$info['tta']['major_version'] = 1;
                
$info['avdataoffset'] += 16;

                
$info['tta']['compression_level']   = ord($ttaheader{3});
                
$info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2));
                
$info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
                
$info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  4));
                
$info['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader12,  4));

                
$info['audio']['encoder_options']   = '-e'.$info['tta']['compression_level'];
                
$info['playtime_seconds']           = $info['tta']['samples_per_channel'] / $info['tta']['sample_rate'];
                break;

            case 
'2'// TTA v2.x
                // "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."
                
$info['tta']['major_version'] = 2;
                
$info['avdataoffset'] += 20;

                
$info['tta']['compression_level']   = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2));
                
$info['tta']['audio_format']        = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
                
$info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  2));
                
$info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader10,  2));
                
$info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader12,  4));
                
$info['tta']['data_length']         = getid3_lib::LittleEndian2Int(substr($ttaheader16,  4));

                
$info['audio']['encoder_options']   = '-e'.$info['tta']['compression_level'];
                
$info['playtime_seconds']           = $info['tta']['data_length'] / $info['tta']['sample_rate'];
                break;

            case 
'1'// TTA v3.x
                // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."
                
$info['tta']['major_version'] = 3;
                
$info['avdataoffset'] += 26;

                
$info['tta']['audio_format']        = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2)); // getid3_riff::RIFFwFormatTagLookup()
                
$info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
                
$info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  2));
                
$info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader10,  4));
                
$info['tta']['data_length']         = getid3_lib::LittleEndian2Int(substr($ttaheader14,  4));
                
$info['tta']['crc32_footer']        =                              substr($ttaheader18,  4);
                
$info['tta']['seek_point']          = getid3_lib::LittleEndian2Int(substr($ttaheader22,  4));

                
$info['playtime_seconds']           = $info['tta']['data_length'] / $info['tta']['sample_rate'];
                break;

            default:
                
$info['error'][] = 'This version of getID3() ['.$this->getid3->version().'] only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3};
                return 
false;
                break;
        }

        
$info['audio']['encoder']         = 'TTA v'.$info['tta']['major_version'];
        
$info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample'];
        
$info['audio']['sample_rate']     = $info['tta']['sample_rate'];
        
$info['audio']['channels']        = $info['tta']['channels'];
        
$info['audio']['bitrate']         = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];

        return 
true;
    }

}


?>