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

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  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: 2 years ago
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->fp, 16);

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

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

           
$ChunkBaseOffset = ftell($this->getid3->fp);
           
$chunkoffset = 0;
           
$ChunkData = fread($this->getid3->fp, 8);
           
$ChunkName = substr($ChunkData, $chunkoffset, 4);
            if (
$ChunkName == 'DATA') {
               
$info['avdataoffset'] = $ChunkBaseOffset;
                break;
            }
           
$chunkoffset += 4;
           
$ChunkSize = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
           
$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, $chunkoffset, 4));
                   
$chunkoffset += 4;
                   
$thisfile_vqf_COMM['bitrate'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
                   
$chunkoffset += 4;
                   
$thisfile_vqf_COMM['sample_rate'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
                   
$chunkoffset += 4;
                   
$thisfile_vqf_COMM['security_level'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
                   
$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($ChunkName)][] = trim(substr($ChunkData, 8));
                    break;

                case
'DSIZ':
                   
$thisfile_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($ChunkData, 8, 4));
                    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);
    }

}


?>