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

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.au.php  >  Download  
File: includes/getid3/module.audio.au.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: 5,395 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.au.php                                         //
// module for analyzing AU files                               //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_au extends getid3_handler
{

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

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$AUheader  fread($this->getid3->fp8);

        
$magic '.snd';
        if (
substr($AUheader04) != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" (".snd") at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($AUheader04)).'"';
            return 
false;
        }

        
// shortcut
        
$info['au'] = array();
        
$thisfile_au        = &$info['au'];

        
$info['fileformat']            = 'au';
        
$info['audio']['dataformat']   = 'au';
        
$info['audio']['bitrate_mode'] = 'cbr';
        
$thisfile_au['encoding']               = 'ISO-8859-1';

        
$thisfile_au['header_length']   = getid3_lib::BigEndian2Int(substr($AUheader,  44));
        
$AUheader .= fread($this->getid3->fp$thisfile_au['header_length'] - 8);
        
$info['avdataoffset'] += $thisfile_au['header_length'];

        
$thisfile_au['data_size']             = getid3_lib::BigEndian2Int(substr($AUheader,  84));
        
$thisfile_au['data_format_id']        = getid3_lib::BigEndian2Int(substr($AUheader124));
        
$thisfile_au['sample_rate']           = getid3_lib::BigEndian2Int(substr($AUheader164));
        
$thisfile_au['channels']              = getid3_lib::BigEndian2Int(substr($AUheader204));
        
$thisfile_au['comments']['comment'][] =                      trim(substr($AUheader24));

        
$thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']);
        
$thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']);
        if (
$thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) {
            
$info['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample'];
        } else {
            unset(
$thisfile_au['bits_per_sample']);
        }

        
$info['audio']['sample_rate']  = $thisfile_au['sample_rate'];
        
$info['audio']['channels']     = $thisfile_au['channels'];

        if ((
$info['avdataoffset'] + $thisfile_au['data_size']) > $info['avdataend']) {
            
$info['warning'][] = 'Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' bytes"';
        }

        
$info['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8));
        
$info['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $info['playtime_seconds'];

        return 
true;
    }

    function 
AUdataFormatNameLookup($id) {
        static 
$AUdataFormatNameLookup = array(
            
0  => 'unspecified format',
            
1  => '8-bit mu-law',
            
2  => '8-bit linear',
            
3  => '16-bit linear',
            
4  => '24-bit linear',
            
5  => '32-bit linear',
            
6  => 'floating-point',
            
7  => 'double-precision float',
            
8  => 'fragmented sampled data',
            
9  => 'SUN_FORMAT_NESTED',
            
10 => 'DSP program',
            
11 => '8-bit fixed-point',
            
12 => '16-bit fixed-point',
            
13 => '24-bit fixed-point',
            
14 => '32-bit fixed-point',

            
16 => 'non-audio display data',
            
17 => 'SND_FORMAT_MULAW_SQUELCH',
            
18 => '16-bit linear with emphasis',
            
19 => '16-bit linear with compression',
            
20 => '16-bit linear with emphasis + compression',
            
21 => 'Music Kit DSP commands',
            
22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',
            
23 => 'CCITT g.721 4-bit ADPCM',
            
24 => 'CCITT g.722 ADPCM',
            
25 => 'CCITT g.723 3-bit ADPCM',
            
26 => 'CCITT g.723 5-bit ADPCM',
            
27 => 'A-Law 8-bit'
        
);
        return (isset(
$AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false);
    }

    function 
AUdataFormatBitsPerSampleLookup($id) {
        static 
$AUdataFormatBitsPerSampleLookup = array(
            
1  => 8,
            
2  => 8,
            
3  => 16,
            
4  => 24,
            
5  => 32,
            
6  => 32,
            
7  => 64,

            
11 => 8,
            
12 => 16,
            
13 => 24,
            
14 => 32,

            
18 => 16,
            
19 => 16,
            
20 => 16,

            
23 => 16,

            
25 => 16,
            
26 => 16,
            
27 => 8
        
);
        return (isset(
$AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false);
    }

    function 
AUdataFormatUsedBitsPerSampleLookup($id) {
        static 
$AUdataFormatUsedBitsPerSampleLookup = array(
            
1  => 8,
            
2  => 8,
            
3  => 16,
            
4  => 24,
            
5  => 32,
            
6  => 32,
            
7  => 64,

            
11 => 8,
            
12 => 16,
            
13 => 24,
            
14 => 32,

            
18 => 16,
            
19 => 16,
            
20 => 16,

            
23 => 4,

            
25 => 3,
            
26 => 5,
            
27 => 8,
        );
        return (isset(
$AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false);
    }

}


?>