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

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.la.php  >  Download  
File: includes/getid3/module.audio.la.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: 9,349 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.la.php                                         //
// module for analyzing LA (LosslessAudio) audio files         //
// dependencies: module.audio.riff.php                         //
//                                                            ///
/////////////////////////////////////////////////////////////////

getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php'__FILE__true);

class 
getid3_la extends getid3_handler
{

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

        
$offset 0;
        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$rawdata fread($this->getid3->fp$this->getid3->fread_buffer_size());

        switch (
substr($rawdata$offset4)) {
            case 
'LA02':
            case 
'LA03':
            case 
'LA04':
                
$info['fileformat']          = 'la';
                
$info['audio']['dataformat'] = 'la';
                
$info['audio']['lossless']   = true;

                
$info['la']['version_major'] = (int) substr($rawdata$offset 21);
                
$info['la']['version_minor'] = (int) substr($rawdata$offset 31);
                
$info['la']['version']       = (float) $info['la']['version_major'] + ($info['la']['version_minor'] / 10);
                
$offset += 4;

                
$info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                
$offset += 4;
                if (
$info['la']['uncompressed_size'] == 0) {
                    
$info['error'][] = 'Corrupt LA file: uncompressed_size == zero';
                    return 
false;
                }

                
$WAVEchunk substr($rawdata$offset4);
                if (
$WAVEchunk !== 'WAVE') {
                    
$info['error'][] = 'Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.';
                    return 
false;
                }
                
$offset += 4;

                
$info['la']['fmt_size'] = 24;
                if (
$info['la']['version'] >= 0.3) {

                    
$info['la']['fmt_size']    = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                    
$info['la']['header_size'] = 49 $info['la']['fmt_size'] - 24;
                    
$offset += 4;

                } else {

                    
// version 0.2 didn't support additional data blocks
                    
$info['la']['header_size'] = 41;

                }

                
$fmt_chunk substr($rawdata$offset4);
                if (
$fmt_chunk !== 'fmt ') {
                    
$info['error'][] = 'Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.';
                    return 
false;
                }
                
$offset += 4;
                
$fmt_size getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                
$offset += 4;

                
$info['la']['raw']['format']  = getid3_lib::LittleEndian2Int(substr($rawdata$offset2));
                
$offset += 2;

                
$info['la']['channels']       = getid3_lib::LittleEndian2Int(substr($rawdata$offset2));
                
$offset += 2;
                if (
$info['la']['channels'] == 0) {
                    
$info['error'][] = 'Corrupt LA file: channels == zero';
                        return 
false;
                }

                
$info['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                
$offset += 4;
                if (
$info['la']['sample_rate'] == 0) {
                    
$info['error'][] = 'Corrupt LA file: sample_rate == zero';
                        return 
false;
                }

                
$info['la']['bytes_per_second']     = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                
$offset += 4;
                
$info['la']['bytes_per_sample']     = getid3_lib::LittleEndian2Int(substr($rawdata$offset2));
                
$offset += 2;
                
$info['la']['bits_per_sample']      = getid3_lib::LittleEndian2Int(substr($rawdata$offset2));
                
$offset += 2;

                
$info['la']['samples']              = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                
$offset += 4;

                
$info['la']['raw']['flags']         = getid3_lib::LittleEndian2Int(substr($rawdata$offset1));
                
$offset += 1;
                
$info['la']['flags']['seekable']             = (bool) ($info['la']['raw']['flags'] & 0x01);
                if (
$info['la']['version'] >= 0.4) {
                    
$info['la']['flags']['high_compression'] = (bool) ($info['la']['raw']['flags'] & 0x02);
                }

                
$info['la']['original_crc']         = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                
$offset += 4;

                
// mikeŘbevin*de
                // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
                // in earlier versions. A seekpoint is added every blocksize * seekevery
                // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
                // give the number of bytes used for the seekpoints. Of course, if seeking
                // is disabled, there are no seekpoints stored.
                
if ($info['la']['version'] >= 0.4) {
                    
$info['la']['blocksize'] = 61440;
                    
$info['la']['seekevery'] = 19;
                } else {
                    
$info['la']['blocksize'] = 73728;
                    
$info['la']['seekevery'] = 16;
                }

                
$info['la']['seekpoint_count'] = 0;
                if (
$info['la']['flags']['seekable']) {
                    
$info['la']['seekpoint_count'] = floor($info['la']['samples'] / ($info['la']['blocksize'] * $info['la']['seekevery']));

                    for (
$i 0$i $info['la']['seekpoint_count']; $i++) {
                        
$info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                        
$offset += 4;
                    }
                }

                if (
$info['la']['version'] >= 0.3) {

                    
// Following the main header information, the program outputs all of the
                    // seekpoints. Following these is what I called the 'footer start',
                    // i.e. the position immediately after the La audio data is finished.
                    
$info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata$offset4));
                    
$offset += 4;

                    if (
$info['la']['footerstart'] > $info['filesize']) {
                        
$info['warning'][] = 'FooterStart value points to offset '.$info['la']['footerstart'].' which is beyond end-of-file ('.$info['filesize'].')';
                        
$info['la']['footerstart'] = $info['filesize'];
                    }

                } else {

                    
// La v0.2 didn't have FooterStart value
                    
$info['la']['footerstart'] = $info['avdataend'];

                }

                if (
$info['la']['footerstart'] < $info['avdataend']) {
                    if (
$RIFFtempfilename tempnam(GETID3_TEMP_DIR'id3')) {
                        if (
$RIFF_fp fopen($RIFFtempfilename'w+b')) {
                            
$RIFFdata 'WAVE';
                            if (
$info['la']['version'] == 0.2) {
                                
$RIFFdata .= substr($rawdata1224);
                            } else {
                                
$RIFFdata .= substr($rawdata1624);
                            }
                            if (
$info['la']['footerstart'] < $info['avdataend']) {
                                
fseek($this->getid3->fp$info['la']['footerstart'], SEEK_SET);
                                
$RIFFdata .= fread($this->getid3->fp$info['avdataend'] - $info['la']['footerstart']);
                            }
                            
$RIFFdata 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4false).$RIFFdata;
                            
fwrite($RIFF_fp$RIFFdatastrlen($RIFFdata));
                            
fclose($RIFF_fp);

                            
$getid3_temp = new getID3();
                            
$getid3_temp->openfile($RIFFtempfilename);
                            
$getid3_riff = new getid3_riff($getid3_temp);
                            
$getid3_riff->Analyze();

                            if (empty(
$getid3_temp->info['error'])) {
                                
$info['riff'] = $getid3_temp->info['riff'];
                            } else {
                                
$info['warning'][] = 'Error parsing RIFF portion of La file: '.implode($getid3_temp->info['error']);
                            }
                            unset(
$getid3_temp$getid3_riff);
                        }
                        
unlink($RIFFtempfilename);
                    }
                }

                
// $info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway
                
$info['avdataend']    = $info['avdataoffset'] + $info['la']['footerstart'];
                
$info['avdataoffset'] = $info['avdataoffset'] + $offset;

                
//$info['la']['codec']                = RIFFwFormatTagLookup($info['la']['raw']['format']);
                
$info['la']['compression_ratio']    = (float) (($info['avdataend'] - $info['avdataoffset']) / $info['la']['uncompressed_size']);
                
$info['playtime_seconds']           = (float) ($info['la']['samples'] / $info['la']['sample_rate']) / $info['la']['channels'];
                if (
$info['playtime_seconds'] == 0) {
                    
$info['error'][] = 'Corrupt LA file: playtime_seconds == zero';
                    return 
false;
                }

                
$info['audio']['bitrate']            = ($info['avdataend'] - $info['avdataoffset']) * $info['playtime_seconds'];
                
//$info['audio']['codec']              = $info['la']['codec'];
                
$info['audio']['bits_per_sample']    = $info['la']['bits_per_sample'];
                break;

            default:
                if (
substr($rawdata$offset2) == 'LA') {
                    
$info['error'][] = 'This version of getID3() ['.$this->getid3->version().'] does not support LA version '.substr($rawdata$offset 21).'.'.substr($rawdata$offset 31).' which this appears to be - check http://getid3.sourceforge.net for updates.';
                } else {
                    
$info['error'][] = 'Not a LA (Lossless-Audio) file';
                }
                return 
false;
                break;
        }

        
$info['audio']['channels']    = $info['la']['channels'];
        
$info['audio']['sample_rate'] = (int) $info['la']['sample_rate'];
        
$info['audio']['encoder']     = 'LA v'.$info['la']['version'];

        return 
true;
    }

}


?>