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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->fp, 8);

       
$magic = '.snd';
        if (
substr($AUheader, 0, 4) != $magic) {
           
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" (".snd") at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($AUheader, 0, 4)).'"';
            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, 4, 4));
       
$AUheader .= fread($this->getid3->fp, $thisfile_au['header_length'] - 8);
       
$info['avdataoffset'] += $thisfile_au['header_length'];

       
$thisfile_au['data_size'] = getid3_lib::BigEndian2Int(substr($AUheader, 8, 4));
       
$thisfile_au['data_format_id'] = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4));
       
$thisfile_au['sample_rate'] = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4));
       
$thisfile_au['channels'] = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4));
       
$thisfile_au['comments']['comment'][] = trim(substr($AUheader, 24));

       
$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);
    }

}


?>