/common/libraries/plugin/getid3/module.audio.mp3.php

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<?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.mp3.php                                        //
// module for analyzing MP3 files                              //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////




// number of frames to scan to determine if MPEG-audio sequence is valid
// Lower this number to 5-20 for faster scanning
// Increase this number to 50+ for most accurate detection of valid VBR/CBR
// mpeg-audio streams
define('GETID3_MP3_VALID_CHECK_FRAMES', 35);



class getid3_mp3

{

    

    var $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files


    

    function __construct(&$fd, &$ThisFileInfo)

    {

        

        if (! $this->getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $ThisFileInfo['avdataoffset']))

        {

            if ($this->allow_bruteforce)

            {

                $ThisFileInfo['error'][] = 'Rescanning file in BruteForce mode';

                $this->getOnlyMPEGaudioInfoBruteForce($fd, $ThisFileInfo);

            }

        }

        

        if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']))

        {

            $ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']);

        }

        

        if (((isset($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) || (! isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0))))

        {

            

            $synchoffsetwarning = 'Unknown data before synch ';

            if (isset($ThisFileInfo['id3v2']['headerlength']))

            {

                $synchoffsetwarning .= '(ID3v2 header ends at ' . $ThisFileInfo['id3v2']['headerlength'] . ', then ' . ($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) . ' bytes garbage, ';

            }

            else

            {

                $synchoffsetwarning .= '(should be at beginning of file, ';

            }

            $synchoffsetwarning .= 'synch detected at ' . $ThisFileInfo['avdataoffset'] . ')';

            if (@$ThisFileInfo['audio']['bitrate_mode'] == 'cbr')

            {

                

                if (! empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength']))

                {

                    

                    $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';

                    $ThisFileInfo['audio']['codec'] = 'LAME';

                    $CurrentDataLAMEversionString = 'LAME3.';

                

                }

                elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength']))

                {

                    

                    $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';

                    $ThisFileInfo['audio']['codec'] = 'LAME';

                    $CurrentDataLAMEversionString = 'LAME3.';

                

                }

            

            }

            $ThisFileInfo['warning'][] = $synchoffsetwarning;

        

        }

        

        if (isset($ThisFileInfo['mpeg']['audio']['LAME']))

        {

            $ThisFileInfo['audio']['codec'] = 'LAME';

            if (! empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version']))

            {

                $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x00");

            }

            elseif (! empty($ThisFileInfo['mpeg']['audio']['LAME']['short_version']))

            {

                $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['short_version'], "\x00");

            }

        }

        

        $CurrentDataLAMEversionString = (! empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : @$ThisFileInfo['audio']['encoder']);

        if (! empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && ! preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, - 1)))

        {

            // a version number of LAME that does not end with a number like "LAME3.92"
            // or with a closing parenthesis like "LAME3.88 (alpha)"
            // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
            



            // not sure what the actual last frame length will be, but will be less than or equal to 1441
            $PossiblyLongerLAMEversion_FrameLength = 1441;

            

            // Not sure what version of LAME this is - look in padding of last frame for longer version string
            $PossibleLAMEversionStringOffset = $ThisFileInfo['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;

            fseek($fd, $PossibleLAMEversionStringOffset);

            $PossiblyLongerLAMEversion_Data = fread($fd, $PossiblyLongerLAMEversion_FrameLength);

            switch (substr($CurrentDataLAMEversionString, - 1))

            {

                case 'a' :

                case 'b' :

                    // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
                    // need to trim off "a" to match longer string
                    $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, - 1);

                    break;

            }

            if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false)

            {

                if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString)

                {

                    $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3"  "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
                    if (strlen($PossiblyLongerLAMEversion_NewString) > strlen(@$ThisFileInfo['audio']['encoder']))

                    {

                        $ThisFileInfo['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;

                    }

                }

            }

        }

        if (! empty($ThisFileInfo['audio']['encoder']))

        {

            $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['audio']['encoder'], "\x00 ");

        }

        

        switch (@$ThisFileInfo['mpeg']['audio']['layer'])

        {

            case 1 :

            case 2 :

                $ThisFileInfo['audio']['dataformat'] = 'mp' . $ThisFileInfo['mpeg']['audio']['layer'];

                break;

        }

        if (@$ThisFileInfo['fileformat'] == 'mp3')

        {

            switch ($ThisFileInfo['audio']['dataformat'])

            {

                case 'mp1' :

                case 'mp2' :

                case 'mp3' :

                    $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];

                    break;

                

                default :

                    $ThisFileInfo['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "' . $ThisFileInfo['audio']['dataformat'] . '"';

                    break;

            }

        }

        

        if (empty($ThisFileInfo['fileformat']))

        {

            unset($ThisFileInfo['fileformat']);

            unset($ThisFileInfo['audio']['bitrate_mode']);

            unset($ThisFileInfo['avdataoffset']);

            unset($ThisFileInfo['avdataend']);

            return false;

        }

        

        $ThisFileInfo['mime_type'] = 'audio/mpeg';

        $ThisFileInfo['audio']['lossless'] = false;

        

        // Calculate playtime
        if (! isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0))

        {

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

        }

        

        $ThisFileInfo['audio']['encoder_options'] = $this->GuessEncoderOptions($ThisFileInfo);

        

        return true;

    }



    function GuessEncoderOptions(&$ThisFileInfo)

    {

        // shortcuts
        if (! empty($ThisFileInfo['mpeg']['audio']))

        {

            $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];

            if (! empty($thisfile_mpeg_audio['LAME']))

            {

                $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];

            }

        }

        

        $encoder_options = '';

        static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);

        

        if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && ! empty($thisfile_mpeg_audio['VBR_quality']))

        {

            

            $encoder_options = 'VBR q' . $thisfile_mpeg_audio['VBR_quality'];

        

        }

        elseif (! empty($thisfile_mpeg_audio_lame['preset_used']) && (! in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates)))

        {

            

            $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];

        

        }

        elseif (! empty($thisfile_mpeg_audio_lame['vbr_quality']))

        {

            

            static $KnownEncoderValues = array();

            if (empty($KnownEncoderValues))

            {

                

                //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
                $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90,   3.90.1, 3.92
                $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
                $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94,   3.95
                $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90,   3.90.1, 3.92
                $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
                $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
                $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90,   3.90.1, 3.92
                $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
                $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
                $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
                $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
                $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
                $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90,   3.90.1, 3.92
                $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
                $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94,   3.95
                $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
                $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
                



                $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
                $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
                $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
                $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94,   3.95
                $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
                $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
                $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
                $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94,   3.95
                $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
                $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93,   3.93.1
                $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94,   3.95
                $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
                $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
                $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
                $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93,   3.93.1
                $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94,   3.95
                $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93,   3.93.1
                $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94,   3.95
                $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
                $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90,   3.90.1, 3.92
                $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
                $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93,   3.93.1
                $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94,   3.95
                $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
                $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
                $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
                $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
                $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94,   3.95
                $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
                $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
                $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
                $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
                $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94,   3.95
            }

            

            if (isset($KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']]))

            {

                

                $encoder_options = $KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];

            

            }

            elseif (isset($KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']]))

            {

                

                $encoder_options = $KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];

            

            }

            elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'vbr')

            {

                

                // http://gabriel.mp3-tech.org/mp3infotag.html
                // int    Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
                



                $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);

                $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);

                $encoder_options = '-V' . $LAME_V_value . ' -q' . $LAME_q_value;

            

            }

            elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr')

            {

                

                $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']) . ceil($ThisFileInfo['audio']['bitrate'] / 1000);

            

            }

            else

            {

                

                $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);

            

            }

        

        }

        elseif (! empty($thisfile_mpeg_audio_lame['bitrate_abr']))

        {

            

            $encoder_options = 'ABR' . $thisfile_mpeg_audio_lame['bitrate_abr'];

        

        }

        elseif (! empty($ThisFileInfo['audio']['bitrate']))

        {

            

            if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr')

            {

                $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']) . ceil($ThisFileInfo['audio']['bitrate'] / 1000);

            }

            else

            {

                $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);

            }

        

        }

        if (! empty($thisfile_mpeg_audio_lame['bitrate_min']))

        {

            $encoder_options .= ' -b' . $thisfile_mpeg_audio_lame['bitrate_min'];

        }

        

        if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])

        {

            $encoder_options .= ' --nogap';

        }

        

        if (! empty($thisfile_mpeg_audio_lame['lowpass_frequency']))

        {

            $ExplodedOptions = explode(' ', $encoder_options, 4);

            if ($ExplodedOptions[0] == '--r3mix')

            {

                $ExplodedOptions[1] = 'r3mix';

            }

            switch ($ExplodedOptions[0])

            {

                case '--preset' :

                case '--alt-preset' :

                case '--r3mix' :

                    if ($ExplodedOptions[1] == 'fast')

                    {

                        $ExplodedOptions[1] .= ' ' . $ExplodedOptions[2];

                    }

                    switch ($ExplodedOptions[1])

                    {

                        case 'portable' :

                        case 'medium' :

                        case 'standard' :

                        case 'extreme' :

                        case 'insane' :

                        case 'fast portable' :

                        case 'fast medium' :

                        case 'fast standard' :

                        case 'fast extreme' :

                        case 'fast insane' :

                        case 'r3mix' :

                            static $ExpectedLowpass = array('insane|20500' => 20500, 'insane|20600' => 20600,  // 3.90.2, 3.90.3, 3.91
                                    'medium|18000' => 18000, 

                                    'fast medium|18000' => 18000, 'extreme|19500' => 19500,  // 3.90,   3.90.1, 3.92, 3.95
                                    'extreme|19600' => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1
                                    'fast extreme|19500' => 19500,  // 3.90,   3.90.1, 3.92, 3.95
                                    'fast extreme|19600' => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1
                                    'standard|19000' => 19000, 

                                    'fast standard|19000' => 19000, 'r3mix|19500' => 19500,  // 3.90,   3.90.1, 3.92
                                    'r3mix|19600' => 19600,  // 3.90.2, 3.90.3, 3.91
                                    'r3mix|18000' => 18000)// 3.94,   3.95
;

                            if (! isset($ExpectedLowpass[$ExplodedOptions[1] . '|' . $thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000)))

                            {

                                $encoder_options .= ' --lowpass ' . $thisfile_mpeg_audio_lame['lowpass_frequency'];

                            }

                            break;

                        

                        default :

                            break;

                    }

                    break;

            }

        }

        

        if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq']))

        {

            if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1))

            {

                $encoder_options .= ' --resample 44100';

            }

            elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2))

            {

                $encoder_options .= ' --resample 48000';

            }

            elseif ($thisfile_mpeg_audio['sample_rate'] < 44100)

            {

                switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])

                {

                    case 0 : // <= 32000
                        // may or may not be same as source frequency - ignore
                        break;

                    case 1 : // 44100
                    case 2 : // 48000
                    case 3 : // 48000+
                        $ExplodedOptions = explode(' ', $encoder_options, 4);

                        switch ($ExplodedOptions[0])

                        {

                            case '--preset' :

                            case '--alt-preset' :

                                switch ($ExplodedOptions[1])

                                {

                                    case 'fast' :

                                    case 'portable' :

                                    case 'medium' :

                                    case 'standard' :

                                    case 'extreme' :

                                    case 'insane' :

                                        $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate'];

                                        break;

                                    

                                    default :

                                        static $ExpectedResampledRate = array('phon+/lw/mw-eu/sw|16000' => 16000, 

                                                'mw-us|24000' => 24000, // 3.95
'mw-us|32000' => 32000,  // 3.93
                                                'mw-us|16000' => 16000,  // 3.92
                                                'phone|16000' => 16000, 

                                                'phone|11025' => 11025, // 3.94a15
'radio|32000' => 32000,  // 3.94a15
                                                'fm/radio|32000' => 32000,  // 3.92
                                                'fm|32000' => 32000,  // 3.90
                                                'voice|32000' => 32000);

                                        if (! isset($ExpectedResampledRate[$ExplodedOptions[1] . '|' . $thisfile_mpeg_audio['sample_rate']]))

                                        {

                                            $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate'];

                                        }

                                        break;

                                }

                                break;

                            

                            case '--r3mix' :

                            default :

                                $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate'];

                                break;

                        }

                        break;

                }

            }

        }

        if (empty($encoder_options) && ! empty($ThisFileInfo['audio']['bitrate']) && ! empty($ThisFileInfo['audio']['bitrate_mode']))

        {

            //$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
            $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);

        }

        

        return $encoder_options;

    }



    function decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch = true, $ScanAsCBR = false, $FastMPEGheaderScan = false)

    {

        

        static $MPEGaudioVersionLookup;

        static $MPEGaudioLayerLookup;

        static $MPEGaudioBitrateLookup;

        static $MPEGaudioFrequencyLookup;

        static $MPEGaudioChannelModeLookup;

        static $MPEGaudioModeExtensionLookup;

        static $MPEGaudioEmphasisLookup;

        if (empty($MPEGaudioVersionLookup))

        {

            $MPEGaudioVersionLookup = getid3_mp3 :: MPEGaudioVersionArray();

            $MPEGaudioLayerLookup = getid3_mp3 :: MPEGaudioLayerArray();

            $MPEGaudioBitrateLookup = getid3_mp3 :: MPEGaudioBitrateArray();

            $MPEGaudioFrequencyLookup = getid3_mp3 :: MPEGaudioFrequencyArray();

            $MPEGaudioChannelModeLookup = getid3_mp3 :: MPEGaudioChannelModeArray();

            $MPEGaudioModeExtensionLookup = getid3_mp3 :: MPEGaudioModeExtensionArray();

            $MPEGaudioEmphasisLookup = getid3_mp3 :: MPEGaudioEmphasisArray();

        }

        

        if ($offset >= $ThisFileInfo['avdataend'])

        {

            $ThisFileInfo['error'][] = 'end of file encounter looking for MPEG synch';

            return false;

        }

        fseek($fd, $offset, SEEK_SET);

        //$headerstring = fread($fd, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
        $headerstring = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
        



        // MP3 audio frame structure:
        // $aa $aa $aa $aa [$bb $bb] $cc...
        // where $aa..$aa is the four-byte mpeg-audio header (below)
        // $bb $bb is the optional 2-byte CRC
        // and $cc... is the audio data
        



        $head4 = substr($headerstring, 0, 4);

        

        static $MPEGaudioHeaderDecodeCache = array();

        if (isset($MPEGaudioHeaderDecodeCache[$head4]))

        {

            $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];

        }

        else

        {

            $MPEGheaderRawArray = getid3_mp3 :: MPEGaudioHeaderDecode($head4);

            $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;

        }

        

        static $MPEGaudioHeaderValidCache = array();

        

        // Not in cache
        if (! isset($MPEGaudioHeaderValidCache[$head4]))

        {

            //$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true);  // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
            $MPEGaudioHeaderValidCache[$head4] = getid3_mp3 :: MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);

        }

        

        // shortcut
        if (! isset($ThisFileInfo['mpeg']['audio']))

        {

            $ThisFileInfo['mpeg']['audio'] = array();

        }

        $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];

        

        if ($MPEGaudioHeaderValidCache[$head4])

        {

            $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;

        }

        else

        {

            $ThisFileInfo['error'][] = 'Invalid MPEG audio header at offset ' . $offset;

            return false;

        }

        

        if (! $FastMPEGheaderScan)

        {

            

            $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];

            $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];

            

            $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];

            $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);

            $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];

            $thisfile_mpeg_audio['protection'] = ! $thisfile_mpeg_audio['raw']['protection'];

            $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];

            $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];

            $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];

            $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];

            $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];

            

            $ThisFileInfo['audio']['channels'] = $thisfile_mpeg_audio['channels'];

            $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];

            

            if ($thisfile_mpeg_audio['protection'])

            {

                $thisfile_mpeg_audio['crc'] = getid3_lib :: BigEndian2Int(substr($headerstring, 4, 2));

            }

        

        }

        

        if ($thisfile_mpeg_audio['raw']['bitrate'] == 15)

        {

            // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
            $ThisFileInfo['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';

            $thisfile_mpeg_audio['raw']['bitrate'] = 0;

        }

        $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];

        $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];

        

        if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $ThisFileInfo['avdataoffset']))

        {

            // only skip multiple frame check if free-format bitstream found at beginning of file
            // otherwise is quite possibly simply corrupted data
            $recursivesearch = false;

        }

        

        // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
        if (! $FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2'))

        {

            

            $ThisFileInfo['audio']['dataformat'] = 'mp2';

            switch ($thisfile_mpeg_audio['channelmode'])

            {

                

                case 'mono' :

                    if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000))

                    {

                        // these are ok
                    }

                    else

                    {

                        $ThisFileInfo['error'][] = $thisfile_mpeg_audio['bitrate'] . 'kbps not allowed in Layer 2, ' . $thisfile_mpeg_audio['channelmode'] . '.';

                        return false;

                    }

                    break;

                

                case 'stereo' :

                case 'joint stereo' :

                case 'dual channel' :

                    if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000))

                    {

                        // these are ok
                    }

                    else

                    {

                        $ThisFileInfo['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)) . 'kbps not allowed in Layer 2, ' . $thisfile_mpeg_audio['channelmode'] . '.';

                        return false;

                    }

                    break;

            

            }

        

        }

        

        if ($ThisFileInfo['audio']['sample_rate'] > 0)

        {

            $thisfile_mpeg_audio['framelength'] = getid3_mp3 :: MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $ThisFileInfo['audio']['sample_rate']);

        }

        

        $nextframetestoffset = $offset + 1;

        if ($thisfile_mpeg_audio['bitrate'] != 'free')

        {

            

            $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];

            

            if (isset($thisfile_mpeg_audio['framelength']))

            {

                $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];

            }

            else

            {

                $ThisFileInfo['error'][] = 'Frame at offset(' . $offset . ') is has an invalid frame length.';

                return false;

            }

        

        }

        

        $ExpectedNumberOfAudioBytes = 0;

        

        ////////////////////////////////////////////////////////////////////////////////////
        // Variable-bitrate headers
        



        if (substr($headerstring, 4 + 32, 4) == 'VBRI')

        {

            // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
            // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
            



            $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';

            $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';

            $ThisFileInfo['audio']['codec'] = 'Fraunhofer';

            

            $SideInfoData = substr($headerstring, 4 + 2, 32);

            

            $FraunhoferVBROffset = 36;

            

            $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion
            $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay
            $thisfile_mpeg_audio['VBR_quality'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality
            $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
            $thisfile_mpeg_audio['VBR_frames'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
            $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
            $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
            $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
            $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
            



            $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];

            

            $previousbyteoffset = $offset;

            for($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i ++)

            {

                $Fraunhofer_OffsetN = getid3_lib :: BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));

                $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];

                $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);

                $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;

                $previousbyteoffset += $Fraunhofer_OffsetN;

            }

        

        }

        else

        {

            

            // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
            // depending on MPEG layer and number of channels
            



            $VBRidOffset = getid3_mp3 :: XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);

            $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);

            

            if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info'))

            {

                // 'Xing' is traditional Xing VBR frame
                // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
                // 'Info' *can* legally be used to specify a VBR file as well, however.
                



                // http://www.multiweb.cz/twoinches/MP3inside.htm
                //00..03 = "Xing" or "Info"
                //04..07 = Flags:
                //  0x01  Frames Flag     set if value for number of frames in file is stored
                //  0x02  Bytes Flag      set if value for filesize in bytes is stored
                //  0x04  TOC Flag        set if values for TOC are stored
                //  0x08  VBR Scale Flag  set if values for VBR scale is stored
                //08..11  Frames: Number of frames in file (including the first Xing/Info one)
                //12..15  Bytes:  File length in Bytes
                //16..115  TOC (Table of Contents):
                //  Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
                //  Each Byte has a value according this formula:
                //  (TOC[i] / 256) * fileLenInBytes
                //  So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
                //  TOC[(60/240)*100] = TOC[25]
                //  and corresponding Byte in file is then approximately at:
                //  (TOC[25]/256) * 5000000
                //116..119  VBR Scale
                



                // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
                //				if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
                $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';

                $thisfile_mpeg_audio['VBR_method'] = 'Xing';

                //				} else {
                //					$ScanAsCBR = true;
                //					$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
                //				}
                



                $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib :: BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));

                

                $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);

                $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);

                $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);

                $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);

                

                if ($thisfile_mpeg_audio['xing_flags']['frames'])

                {

                    $thisfile_mpeg_audio['VBR_frames'] = getid3_lib :: BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));

                

     //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
                }

                if ($thisfile_mpeg_audio['xing_flags']['bytes'])

                {

                    $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib :: BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));

                }

                

                //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
                if (! empty($thisfile_mpeg_audio['VBR_frames']) && ! empty($thisfile_mpeg_audio['VBR_bytes']))

                {

                    

                    $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];

                    

                    if ($thisfile_mpeg_audio['layer'] == '1')

                    {

                        // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
                        //$ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
                        $ThisFileInfo['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 12;

                    }

                    else

                    {

                        // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
                        //$ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
                        $ThisFileInfo['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 144;

                    }

                    $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);

                }

                

                if ($thisfile_mpeg_audio['xing_flags']['toc'])

                {

                    $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);

                    for($i = 0; $i < 100; $i ++)

                    {

                        $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});

                    }

                }

                if ($thisfile_mpeg_audio['xing_flags']['vbr_scale'])

                {

                    $thisfile_mpeg_audio['VBR_scale'] = getid3_lib :: BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));

                }

                

                // http://gabriel.mp3-tech.org/mp3infotag.html
                if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME')

                {

                    

                    // shortcut
                    $thisfile_mpeg_audio['LAME'] = array();

                    $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];

                    

                    $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);

                    $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);

                    

                    if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90')

                    {

                        

                        // extra 11 chars are not part of version string when LAMEtag present
                        unset($thisfile_mpeg_audio_lame['long_version']);

                        

                        // It the LAME tag was only introduced in LAME v3.90
                        // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
                        



                        // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
                        // are assuming a 'Xing' identifier offset of 0x24, which is the case for
                        // MPEG-1 non-mono, but not for other combinations
                        $LAMEtagOffsetContant = $VBRidOffset - 0x24;

                        

                        // shortcuts
                        $thisfile_mpeg_audio_lame['RGAD'] = array('track' => array(), 

                                'album' => array());

                        $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];

                        $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];

                        $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];

                        $thisfile_mpeg_audio_lame['raw'] = array();

                        $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];

                        

                        // byte $9B  VBR Quality
                        // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
                        // Actually overwrites original Xing bytes
                        unset($thisfile_mpeg_audio['VBR_scale']);

                        $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib :: BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));

                        

                        // bytes $9C-$A4  Encoder short VersionString
                        $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);

                        

                        // byte $A5  Info Tag revision + VBR method
                        $LAMEtagRevisionVBRmethod = getid3_lib :: BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));

                        

                        $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;

                        $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;

                        $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3 :: LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);

                        $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
                        



                        // byte $A6  Lowpass filter value
                        $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib :: BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;

                        

                        // bytes $A7-$AE  Replay Gain
                        // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
                        // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
                        if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b')

                        {

                            // LAME 3.94a16 and later - 9.23 fixed point
                            // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
                            $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib :: BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);

                        }

                        else

                        {

                            // LAME 3.94a15 and earlier - 32-bit floating point
                            // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
                            $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib :: LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));

                        }

                        if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0)

                        {

                            unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);

                        }

                        else

                        {

                            $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib :: RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_a…

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