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

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.shorten.php  >  Download  
File: includes/getid3/module.audio.shorten.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: 7,703 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.shorten.php //
// module for analyzing Shorten Audio files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////


class getid3_shorten extends getid3_handler
{

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

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

       
$ShortenHeader = fread($this->getid3->fp, 8);
       
$magic = 'ajkg';
        if (
substr($ShortenHeader, 0, 4) != $magic) {
           
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($ShortenHeader, 0, 4)).'"';
            return
false;
        }
       
$info['fileformat'] = 'shn';
       
$info['audio']['dataformat'] = 'shn';
       
$info['audio']['lossless'] = true;
       
$info['audio']['bitrate_mode'] = 'vbr';

       
$info['shn']['version'] = getid3_lib::LittleEndian2Int(substr($ShortenHeader, 4, 1));

       
fseek($this->getid3->fp, $info['avdataend'] - 12, SEEK_SET);
       
$SeekTableSignatureTest = fread($this->getid3->fp, 12);
       
$info['shn']['seektable']['present'] = (bool) (substr($SeekTableSignatureTest, 4, 8) == 'SHNAMPSK');
        if (
$info['shn']['seektable']['present']) {
           
$info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($SeekTableSignatureTest, 0, 4));
           
$info['shn']['seektable']['offset'] = $info['avdataend'] - $info['shn']['seektable']['length'];
           
fseek($this->getid3->fp, $info['shn']['seektable']['offset'], SEEK_SET);
           
$SeekTableMagic = fread($this->getid3->fp, 4);
           
$magic = 'SEEK';
            if (
$SeekTableMagic != $magic) {

               
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['shn']['seektable']['offset'].', found "'.getid3_lib::PrintHexBytes($SeekTableMagic).'"';
                return
false;

            } else {

               
// typedef struct tag_TSeekEntry
                // {
                // unsigned long SampleNumber;
                // unsigned long SHNFileByteOffset;
                // unsigned long SHNLastBufferReadPosition;
                // unsigned short SHNByteGet;
                // unsigned short SHNBufferOffset;
                // unsigned short SHNFileBitOffset;
                // unsigned long SHNGBuffer;
                // unsigned short SHNBitShift;
                // long CBuf0[3];
                // long CBuf1[3];
                // long Offset0[4];
                // long Offset1[4];
                // }TSeekEntry;

               
$SeekTableData = fread($this->getid3->fp, $info['shn']['seektable']['length'] - 16);
               
$info['shn']['seektable']['entry_count'] = floor(strlen($SeekTableData) / 80);
               
//$info['shn']['seektable']['entries'] = array();
                //$SeekTableOffset = 0;
                //for ($i = 0; $i < $info['shn']['seektable']['entry_count']; $i++) {
                // $SeekTableEntry['sample_number'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // $SeekTableEntry['shn_file_byte_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // $SeekTableEntry['shn_last_buffer_read_position'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // $SeekTableEntry['shn_byte_get'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
                // $SeekTableOffset += 2;
                // $SeekTableEntry['shn_buffer_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
                // $SeekTableOffset += 2;
                // $SeekTableEntry['shn_file_bit_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
                // $SeekTableOffset += 2;
                // $SeekTableEntry['shn_gbuffer'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // $SeekTableEntry['shn_bit_shift'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
                // $SeekTableOffset += 2;
                // for ($j = 0; $j < 3; $j++) {
                // $SeekTableEntry['cbuf0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // }
                // for ($j = 0; $j < 3; $j++) {
                // $SeekTableEntry['cbuf1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // }
                // for ($j = 0; $j < 4; $j++) {
                // $SeekTableEntry['offset0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // }
                // for ($j = 0; $j < 4; $j++) {
                // $SeekTableEntry['offset1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
                // $SeekTableOffset += 4;
                // }
                //
                // $info['shn']['seektable']['entries'][] = $SeekTableEntry;
                //}

           
}

        }

        if (
preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
           
$info['error'][] = 'PHP running in Safe Mode - backtick operator not available, cannot run shntool to analyze Shorten files';
            return
false;
        }

        if (
GETID3_OS_ISWINDOWS) {

           
$RequiredFiles = array('shorten.exe', 'cygwin1.dll', 'head.exe');
            foreach (
$RequiredFiles as $required_file) {
                if (!
is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
                   
$info['error'][] = GETID3_HELPERAPPSDIR.$required_file.' does not exist';
                    return
false;
                }
            }
           
$commandline = GETID3_HELPERAPPSDIR.'shorten.exe -x "'.$info['filenamepath'].'" - | '.GETID3_HELPERAPPSDIR.'head.exe -c 64';
           
$commandline = str_replace('/', '\\', $commandline);

        } else {

            static
$shorten_present;
            if (!isset(
$shorten_present)) {
               
$shorten_present = file_exists('/usr/local/bin/shorten') || `which shorten`;
            }
            if (!
$shorten_present) {
               
$info['error'][] = 'shorten binary was not found in path or /usr/local/bin';
                return
false;
            }
           
$commandline = (file_exists('/usr/local/bin/shorten') ? '/usr/local/bin/' : '' ) . 'shorten -x '.escapeshellarg($info['filenamepath']).' - | head -c 64';

        }

       
$output = `$commandline`;

        if (!empty(
$output) && (substr($output, 12, 4) == 'fmt ')) {

           
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);

           
$fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));
           
$DecodedWAVFORMATEX = getid3_riff::RIFFparseWAVEFORMATex(substr($output, 20, $fmt_size));
           
$info['audio']['channels'] = $DecodedWAVFORMATEX['channels'];
           
$info['audio']['bits_per_sample'] = $DecodedWAVFORMATEX['bits_per_sample'];
           
$info['audio']['sample_rate'] = $DecodedWAVFORMATEX['sample_rate'];

            if (
substr($output, 20 + $fmt_size, 4) == 'data') {

               
$info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $DecodedWAVFORMATEX['raw']['nAvgBytesPerSec'];

            } else {

               
$info['error'][] = 'shorten failed to decode DATA chunk to expected location, cannot determine playtime';
                return
false;

            }

           
$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) / $info['playtime_seconds']) * 8;

        } else {

           
$info['error'][] = 'shorten failed to decode file to WAV for parsing';
            return
false;

        }

        return
true;
    }

}

?>