<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////
// 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 extends getid3_handler
{

    public 
$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

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

        
$initialOffset $info['avdataoffset'];

        if (!
$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
            if (
$this->allow_bruteforce) {
                
$info['error'][] = 'Rescanning file in BruteForce mode';
                
$this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp$info);
            }
        }


        if (isset(
$info['mpeg']['audio']['bitrate_mode'])) {
            
$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
        }

        if (((isset(
$info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {

            
$synchoffsetwarning 'Unknown data before synch ';
            if (isset(
$info['id3v2']['headerlength'])) {
                
$synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
            } elseif (
$initialOffset 0) {
                
$synchoffsetwarning .= '(should be at '.$initialOffset.', ';
            } else {
                
$synchoffsetwarning .= '(should be at beginning of file, ';
            }
            
$synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
            if (isset(
$info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {

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

                    
$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
                    
$info['audio']['codec'] = 'LAME';
                    
$CurrentDataLAMEversionString 'LAME3.';

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

                    
$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
                    
$info['audio']['codec'] = 'LAME';
                    
$CurrentDataLAMEversionString 'LAME3.';

                }

            }
            
$info['warning'][] = $synchoffsetwarning;

        }

        if (isset(
$info['mpeg']['audio']['LAME'])) {
            
$info['audio']['codec'] = 'LAME';
            if (!empty(
$info['mpeg']['audio']['LAME']['long_version'])) {
                
$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
            } elseif (!empty(
$info['mpeg']['audio']['LAME']['short_version'])) {
                
$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
            }
        }

        
$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
        if (!empty(
$CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString06) == '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 $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
            
$this->fseek($PossibleLAMEversionStringOffset);
            
$PossiblyLongerLAMEversion_Data $this->fread($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
                    
$CurrentDataLAMEversionString substr($CurrentDataLAMEversionString0, -1);
                    break;
            }
            if ((
$PossiblyLongerLAMEversion_String strstr($PossiblyLongerLAMEversion_Data$CurrentDataLAMEversionString)) !== false) {
                if (
substr($PossiblyLongerLAMEversion_String0strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
                    
$PossiblyLongerLAMEversion_NewString substr($PossiblyLongerLAMEversion_String0strspn($PossiblyLongerLAMEversion_String'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3"  "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
                    
if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
                        
$info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
                    }
                }
            }
        }
        if (!empty(
$info['audio']['encoder'])) {
            
$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
        }

        switch (isset(
$info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
            case 
1:
            case 
2:
                
$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
                break;
        }
        if (isset(
$info['fileformat']) && ($info['fileformat'] == 'mp3')) {
            switch (
$info['audio']['dataformat']) {
                case 
'mp1':
                case 
'mp2':
                case 
'mp3':
                    
$info['fileformat'] = $info['audio']['dataformat'];
                    break;

                default:
                    
$info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"';
                    break;
            }
        }

        if (empty(
$info['fileformat'])) {
            unset(
$info['fileformat']);
            unset(
$info['audio']['bitrate_mode']);
            unset(
$info['avdataoffset']);
            unset(
$info['avdataend']);
            return 
false;
        }

        
$info['mime_type']         = 'audio/mpeg';
        
$info['audio']['lossless'] = false;

        
// Calculate playtime
        
if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
            
$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * $info['audio']['bitrate'];
        }

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

        return 
true;
    }


    public function 
GuessEncoderOptions() {
        
// shortcuts
        
$info = &$this->getid3->info;
        if (!empty(
$info['mpeg']['audio'])) {
            
$thisfile_mpeg_audio = &$info['mpeg']['audio'];
            if (!empty(
$thisfile_mpeg_audio['LAME'])) {
                
$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
            }
        }

        
$encoder_options '';
        static 
$NamedPresetBitrates = array(16244056112128160192256);

        if (isset(
$thisfile_mpeg_audio['VBR_method']) && ($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 (
$info['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 (
$info['audio']['bitrate_mode'] == 'cbr') {

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

            } else {

                
$encoder_options strtoupper($info['audio']['bitrate_mode']);

            }

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

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

        } elseif (!empty(
$info['audio']['bitrate'])) {

            if (
$info['audio']['bitrate_mode'] == 'cbr') {
                
$encoder_options strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
            } else {
                
$encoder_options strtoupper($info['audio']['bitrate_mode']);
            }

        }
        if (!empty(
$thisfile_mpeg_audio_lame['bitrate_min'])) {
            
$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
        }

        if (!empty(
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
            
$encoder_options .= ' --nogap';
        }

        if (!empty(
$thisfile_mpeg_audio_lame['lowpass_frequency'])) {
            
$ExplodedOptions explode(' '$encoder_options4);
            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_options4);
                        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(
$encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
            
//$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
            
$encoder_options strtoupper($info['audio']['bitrate_mode']);
        }

        return 
$encoder_options;
    }


    public function 
decodeMPEGaudioHeader($offset, &$info$recursivesearch=true$ScanAsCBR=false$FastMPEGheaderScan=false) {
        static 
$MPEGaudioVersionLookup;
        static 
$MPEGaudioLayerLookup;
        static 
$MPEGaudioBitrateLookup;
        static 
$MPEGaudioFrequencyLookup;
        static 
$MPEGaudioChannelModeLookup;
        static 
$MPEGaudioModeExtensionLookup;
        static 
$MPEGaudioEmphasisLookup;
        if (empty(
$MPEGaudioVersionLookup)) {
            
$MPEGaudioVersionLookup       self::MPEGaudioVersionArray();
            
$MPEGaudioLayerLookup         self::MPEGaudioLayerArray();
            
$MPEGaudioBitrateLookup       self::MPEGaudioBitrateArray();
            
$MPEGaudioFrequencyLookup     self::MPEGaudioFrequencyArray();
            
$MPEGaudioChannelModeLookup   self::MPEGaudioChannelModeArray();
            
$MPEGaudioModeExtensionLookup self::MPEGaudioModeExtensionArray();
            
$MPEGaudioEmphasisLookup      self::MPEGaudioEmphasisArray();
        }

        if (
$this->fseek($offset) != 0) {
            
$info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset;
            return 
false;
        }
        
//$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
        
$headerstring $this->fread(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

        
$head4 substr($headerstring04);
        static 
$MPEGaudioHeaderDecodeCache = array();
        if (isset(
$MPEGaudioHeaderDecodeCache[$head4])) {
            
$MPEGheaderRawArray $MPEGaudioHeaderDecodeCache[$head4];
        } else {
            
$MPEGheaderRawArray self::MPEGaudioHeaderDecode($head4);
            
$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
        }

        static 
$MPEGaudioHeaderValidCache = array();
        if (!isset(
$MPEGaudioHeaderValidCache[$head4])) { // Not in cache
            //$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true);  // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
            
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArrayfalsefalse);
        }

        
// shortcut
        
if (!isset($info['mpeg']['audio'])) {
            
$info['mpeg']['audio'] = array();
        }
        
$thisfile_mpeg_audio = &$info['mpeg']['audio'];


        if (
$MPEGaudioHeaderValidCache[$head4]) {
            
$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
        } else {
            
$info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') 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') ? 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']];

            
$info['audio']['channels']    = $thisfile_mpeg_audio['channels'];
            
$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];

            if (
$thisfile_mpeg_audio['protection']) {
                
$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring42));
            }
        }

        if (
$thisfile_mpeg_audio['raw']['bitrate'] == 15) {
            
// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
            
$info['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 == $info['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')) {

            
$info['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 {
                        
$info['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 {
                        
$info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
                        return 
false;
                    }
                    break;

            }

        }


        if (
$info['audio']['sample_rate'] > 0) {
            
$thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
        }

        
$nextframetestoffset $offset 1;
        if (
$thisfile_mpeg_audio['bitrate'] != 'free') {

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

            if (isset(
$thisfile_mpeg_audio['framelength'])) {
                
$nextframetestoffset $offset $thisfile_mpeg_audio['framelength'];
            } else {
                
$info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
                return 
false;
            }

        }

        
$ExpectedNumberOfAudioBytes 0;

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

        
if (substr($headerstring324) == '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';
            
$info['audio']['codec']                = 'Fraunhofer';

            
$SideInfoData substr($headerstring232);

            
$FraunhoferVBROffset 36;

            
$thisfile_mpeg_audio['VBR_encoder_version']     = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset +  42)); // VbriVersion
            
$thisfile_mpeg_audio['VBR_encoder_delay']       = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset +  62)); // VbriDelay
            
$thisfile_mpeg_audio['VBR_quality']             = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset +  82)); // VbriQuality
            
$thisfile_mpeg_audio['VBR_bytes']               = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset 104)); // VbriStreamBytes
            
$thisfile_mpeg_audio['VBR_frames']              = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset 144)); // VbriStreamFrames
            
$thisfile_mpeg_audio['VBR_seek_offsets']        = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset 182)); // VbriTableSize
            
$thisfile_mpeg_audio['VBR_seek_scale']          = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset 202)); // VbriTableScale
            
$thisfile_mpeg_audio['VBR_entry_bytes']         = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset 222)); // VbriEntryBytes
            
$thisfile_mpeg_audio['VBR_entry_frames']        = getid3_lib::BigEndian2Int(substr($headerstring$FraunhoferVBROffset 242)); // 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

            
$VBRidOffset self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
            
$SideInfoData substr($headerstring2$VBRidOffset 4);

            if ((
substr($headerstring$VBRidOffsetstrlen('Xing')) == 'Xing') || (substr($headerstring$VBRidOffsetstrlen('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 44));

                
$thisfile_mpeg_audio['xing_flags']['frames']    = (bool) ($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 +  84));
                    
//$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 124));
                }

                
//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'])) {
                
if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
                    
$used_filesize  0;
                    if (!empty(
$thisfile_mpeg_audio['VBR_bytes'])) {
                        
$used_filesize $thisfile_mpeg_audio['VBR_bytes'];
                    } elseif (!empty(
$info['filesize'])) {
                        
$used_filesize  $info['filesize'];
                        
$used_filesize -= intval(@$info['id3v2']['headerlength']);
                        
$used_filesize -= (isset($info['id3v1']) ? 128 0);
                        
$used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
                        
$info['warning'][] = 'MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes';
                    }

                    
$framelengthfloat $used_filesize $thisfile_mpeg_audio['VBR_frames'];

                    if (
$thisfile_mpeg_audio['layer'] == '1') {
                        
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
                        //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
                        
$info['audio']['bitrate'] = ($framelengthfloat 4) * $thisfile_mpeg_audio['sample_rate'] * ($info['audio']['channels']) / 12;
                    } else {
                        
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
                        //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
                        
$info['audio']['bitrate'] = $framelengthfloat $thisfile_mpeg_audio['sample_rate'] * ($info['audio']['channels']) / 144;
                    }
                    
$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
                }

                if (
$thisfile_mpeg_audio['xing_flags']['toc']) {
                    
$LAMEtocData substr($headerstring$VBRidOffset 16100);
                    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 1164));
                }


                
// http://gabriel.mp3-tech.org/mp3infotag.html
                
if (substr($headerstring$VBRidOffset 1204) == 'LAME') {

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


                    
$thisfile_mpeg_audio_lame['long_version']  = substr($headerstring$VBRidOffset 12020);
                    
$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 09);

                    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 0x9B1));

                        
// bytes $9C-$A4  Encoder short VersionString
                        
$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring$LAMEtagOffsetContant 0x9C9);

                        
// byte $A5  Info Tag revision + VBR method
                        
$LAMEtagRevisionVBRmethod getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xA51));

                        
$thisfile_mpeg_audio_lame['tag_revision']   = ($LAMEtagRevisionVBRmethod 0xF0) >> 4;
                        
$thisfile_mpeg_audio_lame_raw['vbr_method'] =  $LAMEtagRevisionVBRmethod 0x0F;
                        
$thisfile_mpeg_audio_lame['vbr_method']     = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
                        
$thisfile_mpeg_audio['bitrate_mode']        = substr($thisfile_mpeg_audio_lame['vbr_method'], 03); // 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 0xA61)) * 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 0xA74))) / 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 0xA74));
                        }
                        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_amplitude']);
                        }

                        
$thisfile_mpeg_audio_lame_raw['RGAD_track']      =   getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xAB2));
                        
$thisfile_mpeg_audio_lame_raw['RGAD_album']      =   getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xAD2));


                        if (
$thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {

                            
$thisfile_mpeg_audio_lame_RGAD_track['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
                            
$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
                            
$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
                            
$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] =  $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
                            
$thisfile_mpeg_audio_lame_RGAD_track['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
                            
$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
                            
$thisfile_mpeg_audio_lame_RGAD_track['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);

                            if (!empty(
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
                                
$info['replay_gain']['track']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
                            }
                            
$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
                            
$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
                        } else {
                            unset(
$thisfile_mpeg_audio_lame_RGAD['track']);
                        }
                        if (
$thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {

                            
$thisfile_mpeg_audio_lame_RGAD_album['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
                            
$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
                            
$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
                            
$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
                            
$thisfile_mpeg_audio_lame_RGAD_album['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
                            
$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
                            
$thisfile_mpeg_audio_lame_RGAD_album['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);

                            if (!empty(
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
                                
$info['replay_gain']['album']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
                            }
                            
$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
                            
$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
                        } else {
                            unset(
$thisfile_mpeg_audio_lame_RGAD['album']);
                        }
                        if (empty(
$thisfile_mpeg_audio_lame_RGAD)) {
                            unset(
$thisfile_mpeg_audio_lame['RGAD']);
                        }


                        
// byte $AF  Encoding flags + ATH Type
                        
$EncodingFlagsATHtype getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xAF1));
                        
$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune']   = (bool) ($EncodingFlagsATHtype 0x10);
                        
$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype 0x20);
                        
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']  = (bool) ($EncodingFlagsATHtype 0x40);
                        
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']  = (bool) ($EncodingFlagsATHtype 0x80);
                        
$thisfile_mpeg_audio_lame['ath_type']                      =         $EncodingFlagsATHtype 0x0F;

                        
// byte $B0  if ABR {specified bitrate} else {minimal bitrate}
                        
$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xB01));
                        if (
$thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
                            
$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
                        } elseif (
$thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
                            // ignore
                        
} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
                            
$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
                        }

                        
// bytes $B1-$B3  Encoder delays
                        
$EncoderDelays getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xB13));
                        
$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays 0xFFF000) >> 12;
                        
$thisfile_mpeg_audio_lame['end_padding']   =  $EncoderDelays 0x000FFF;

                        
// byte $B4  Misc
                        
$MiscByte getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xB41));
                        
$thisfile_mpeg_audio_lame_raw['noise_shaping']       = ($MiscByte 0x03);
                        
$thisfile_mpeg_audio_lame_raw['stereo_mode']         = ($MiscByte 0x1C) >> 2;
                        
$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte 0x20) >> 5;
                        
$thisfile_mpeg_audio_lame_raw['source_sample_freq']  = ($MiscByte 0xC0) >> 6;
                        
$thisfile_mpeg_audio_lame['noise_shaping']       = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
                        
$thisfile_mpeg_audio_lame['stereo_mode']         = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
                        
$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
                        
$thisfile_mpeg_audio_lame['source_sample_freq']  = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);

                        
// byte $B5  MP3 Gain
                        
$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xB51), falsetrue);
                        
$thisfile_mpeg_audio_lame['mp3_gain_db']     = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
                        
$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));

                        
// bytes $B6-$B7  Preset and surround info
                        
$PresetSurroundBytes getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xB62));
                        
// Reserved                                                    = ($PresetSurroundBytes & 0xC000);
                        
$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes 0x3800);
                        
$thisfile_mpeg_audio_lame['surround_info']     = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
                        
$thisfile_mpeg_audio_lame['preset_used_id']    = ($PresetSurroundBytes 0x07FF);
                        
$thisfile_mpeg_audio_lame['preset_used']       = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
                        if (!empty(
$thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
                            
$info['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org';
                        }
                        if ((
$thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
                            
// this may change if 3.90.4 ever comes out
                            
$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
                        }

                        
// bytes $B8-$BB  MusicLength
                        
$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xB84));
                        
$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);

                        
// bytes $BC-$BD  MusicCRC
                        
$thisfile_mpeg_audio_lame['music_crc']    = getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xBC2));

                        
// bytes $BE-$BF  CRC-16 of Info Tag
                        
$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring$LAMEtagOffsetContant 0xBE2));


                        
// LAME CBR
                        
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {

                            
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
                            
$thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
                            
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
                            
//if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
                            //    $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
                            //}

                        
}

                    }
                }

            } else {

                
// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
                
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
                if (
$recursivesearch) {
                    
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
                    if (
$this->RecursiveFrameScanning($offset$nextframetestoffsettrue)) {
                        
$recursivesearch false;
                        
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
                    }
                    if (
$thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
                        
$info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
                    }
                }

            }

        }

        if ((
$ExpectedNumberOfAudioBytes 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
            if (
$ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
                if (
$this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
                    
// ignore, audio data is broken into chunks so will always be data "missing"
                
}
                elseif ((
$ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
                    
$this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
                }
                else {
                    
$this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
                }
            } else {
                if (((
$info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
                
//    $prenullbytefileoffset = $this->ftell();
                //    $this->fseek($info['avdataend']);
                //    $PossibleNullByte = $this->fread(1);
                //    $this->fseek($prenullbytefileoffset);
                //    if ($PossibleNullByte === "\x00") {
                        
$info['avdataend']--;
                
//        $info['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
                //    } else {
                //        $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
                //    }
                
} else {
                    
$info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
                }
            }
        }

        if ((
$thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
            if ((
$offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
                
$framebytelength $this->FreeFormatFrameLength($offsettrue);
                if (
$framebytelength 0) {
                    
$thisfile_mpeg_audio['framelength'] = $framebytelength;
                    if (
$thisfile_mpeg_audio['layer'] == '1') {
                        
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
                        
$info['audio']['bitrate'] = ((($framebytelength 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
                    } else {
                        
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
                        
$info['audio']['bitrate'] = (($framebytelength intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
                    }
                } else {
                    
$info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
                }
            }
        }

        if (isset(
$thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
            switch (
$thisfile_mpeg_audio['bitrate_mode']) {
                case 
'vbr':
                case 
'abr':
                    
$bytes_per_frame 1152;
                    if ((
$thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
                        
$bytes_per_frame 384;
                    } elseif (((
$thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
                        
$bytes_per_frame 576;
                    }
                    
$thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
                    if (
$thisfile_mpeg_audio['VBR_bitrate'] > 0) {
                        
$info['audio']['bitrate']       = $thisfile_mpeg_audio['VBR_bitrate'];
                        
$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
                    
}
                    break;
            }
        }

        
// End variable-bitrate headers
        ////////////////////////////////////////////////////////////////////////////////////

        
if ($recursivesearch) {

            if (!
$this->RecursiveFrameScanning($offset$nextframetestoffset$ScanAsCBR)) {
                return 
false;
            }

        }


        
//if (false) {
        //    // experimental side info parsing section - not returning anything useful yet
        //
        //    $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
        //    $SideInfoOffset = 0;
        //
        //    if ($thisfile_mpeg_audio['version'] == '1') {
        //        if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
        //            // MPEG-1 (mono)
        //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
        //            $SideInfoOffset += 9;
        //            $SideInfoOffset += 5;
        //        } else {
        //            // MPEG-1 (stereo, joint-stereo, dual-channel)
        //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
        //            $SideInfoOffset += 9;
        //            $SideInfoOffset += 3;
        //        }
        //    } else { // 2 or 2.5
        //        if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
        //            // MPEG-2, MPEG-2.5 (mono)
        //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
        //            $SideInfoOffset += 8;
        //            $SideInfoOffset += 1;
        //        } else {
        //            // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
        //            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
        //            $SideInfoOffset += 8;
        //            $SideInfoOffset += 2;
        //        }
        //    }
        //
        //    if ($thisfile_mpeg_audio['version'] == '1') {
        //        for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
        //            for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
        //                $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
        //                $SideInfoOffset += 2;
        //            }
        //        }
        //    }
        //    for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
        //        for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
        //            $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
        //            $SideInfoOffset += 12;
        //            $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
        //            $SideInfoOffset += 9;
        //            $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
        //            $SideInfoOffset += 8;
        //            if ($thisfile_mpeg_audio['version'] == '1') {
        //                $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
        //                $SideInfoOffset += 4;
        //            } else {
        //                $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
        //                $SideInfoOffset += 9;
        //            }
        //            $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
        //            $SideInfoOffset += 1;
        //
        //            if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
        //
        //                $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
        //                $SideInfoOffset += 2;
        //                $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
        //                $SideInfoOffset += 1;
        //
        //                for ($region = 0; $region < 2; $region++) {
        //                    $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
        //                    $SideInfoOffset += 5;
        //                }
        //                $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
        //
        //                for ($window = 0; $window < 3; $window++) {
        //                    $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
        //                    $SideInfoOffset += 3;
        //                }
        //
        //            } else {
        //
        //                for ($region = 0; $region < 3; $region++) {
        //                    $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
        //                    $SideInfoOffset += 5;
        //                }
        //
        //                $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
        //                $SideInfoOffset += 4;
        //                $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
        //                $SideInfoOffset += 3;
        //                $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
        //            }
        //
        //            if ($thisfile_mpeg_audio['version'] == '1') {
        //                $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
        //                $SideInfoOffset += 1;
        //            }
        //            $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
        //            $SideInfoOffset += 1;
        //            $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
        //            $SideInfoOffset += 1;
        //        }
        //    }
        //}

        
return true;
    }

    public function 
RecursiveFrameScanning(&$offset, &$nextframetestoffset$ScanAsCBR) {
        
$info = &$this->getid3->info;
        
$firstframetestarray = array('error'=>'''warning'=>'''avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
        
$this->decodeMPEGaudioHeader($offset$firstframetestarrayfalse);

        for (
$i 0$i GETID3_MP3_VALID_CHECK_FRAMES$i++) {
            
// check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
            
if (($nextframetestoffset 4) >= $info['avdataend']) {
                
// end of file
                
return true;
            }

            
$nextframetestarray = array('error'=>'''warning'=>'''avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
            if (
$this->decodeMPEGaudioHeader($nextframetestoffset$nextframetestarrayfalse)) {
                if (
$ScanAsCBR) {
                    
// force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
                    
if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
                        return 
false;
                    }
                }


                
// next frame is OK, get ready to check the one after that
                
if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
                    
$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
                } else {
                    
$info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
                    return 
false;
                }

            } elseif (!empty(
$firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {

                
// it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK
                
return true;

            } else {

                
// next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
                
$info['warning'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';

                return 
false;
            }
        }
        return 
true;
    }

    public function 
FreeFormatFrameLength($offset$deepscan=false) {
        
$info = &$this->getid3->info;

        
$this->fseek($offset);
        
$MPEGaudioData $this->fread(32768);

        
$SyncPattern1 substr($MPEGaudioData04);
        
// may be different pattern due to padding
        
$SyncPattern2 $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3};
        if (
$SyncPattern2 === $SyncPattern1) {
            
$SyncPattern2 $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
        }

        
$framelength false;
        
$framelength1 strpos($MPEGaudioData$SyncPattern14);
        
$framelength2 strpos($MPEGaudioData$SyncPattern24);
        if (
$framelength1 4) {
            
$framelength $framelength1;
        }
        if ((
$framelength2 4) && ($framelength2 $framelength1)) {
            
$framelength $framelength2;
        }
        if (!
$framelength) {

            
// LAME 3.88 has a different value for modeextension on the first frame vs the rest
            
$framelength1 strpos($MPEGaudioDatasubstr($SyncPattern103), 4);
            
$framelength2 strpos($MPEGaudioDatasubstr($SyncPattern203), 4);

            if (
$framelength1 4) {
                
$framelength $framelength1;
            }
            if ((
$framelength2 4) && ($framelength2 $framelength1)) {
                
$framelength $framelength2;
            }
            if (!
$framelength) {
                
$info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
                return 
false;
            } else {
                
$info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
                
$info['audio']['codec']   = 'LAME';
                
$info['audio']['encoder'] = 'LAME3.88';
                
$SyncPattern1 substr($SyncPattern103);
                
$SyncPattern2 substr($SyncPattern203);
            }
        }

        if (
$deepscan) {

            
$ActualFrameLengthValues = array();
            
$nextoffset $offset $framelength;
            while (
$nextoffset < ($info['avdataend'] - 6)) {
                
$this->fseek($nextoffset 1);
                
$NextSyncPattern $this->fread(6);
                if ((
substr($NextSyncPattern1strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern1strlen($SyncPattern2)) == $SyncPattern2)) {
                    
// good - found where expected
                    
$ActualFrameLengthValues[] = $framelength;
                } elseif ((
substr($NextSyncPattern0strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern0strlen($SyncPattern2)) == $SyncPattern2)) {
                    
// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
                    
$ActualFrameLengthValues[] = ($framelength 1);
                    
$nextoffset--;
                } elseif ((
substr($NextSyncPattern2strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern2strlen($SyncPattern2)) == $SyncPattern2)) {
                    
// ok - found one byte later than expected (last frame was padded, first frame wasn't)
                    
$ActualFrameLengthValues[] = ($framelength 1);
                    
$nextoffset++;
                } else {
                    
$info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
                    return 
false;
                }
                
$nextoffset += $framelength;
            }
            if (
count($ActualFrameLengthValues) > 0) {
                
$framelength intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
            }
        }
        return 
$framelength;
    }

    public function 
getOnlyMPEGaudioInfoBruteForce() {
        
$MPEGaudioHeaderDecodeCache   = array();
        
$MPEGaudioHeaderValidCache    = array();
        
$MPEGaudioHeaderLengthCache   = array();
        
$MPEGaudioVersionLookup       self::MPEGaudioVersionArray();
        
$MPEGaudioLayerLookup         self::MPEGaudioLayerArray();
        
$MPEGaudioBitrateLookup       self::MPEGaudioBitrateArray();
        
$MPEGaudioFrequencyLookup     self::MPEGaudioFrequencyArray();
        
$MPEGaudioChannelModeLookup   self::MPEGaudioChannelModeArray();
        
$MPEGaudioModeExtensionLookup self::MPEGaudioModeExtensionArray();
        
$MPEGaudioEmphasisLookup      self::MPEGaudioEmphasisArray();
        
$LongMPEGversionLookup        = array();
        
$LongMPEGlayerLookup          = array();
        
$LongMPEGbitrateLookup        = array();
        
$LongMPEGpaddingLookup        = array();
        
$LongMPEGfrequencyLookup      = array();
        
$Distribution['bitrate']      = array();
        
$Distribution['frequency']    = array();
        
$Distribution['layer']        = array();
        
$Distribution['version']      = array();
        
$Distribution['padding']      = array();

        
$info = &$this->getid3->info;
        
$this->fseek($info['avdataoffset']);

        
$max_frames_scan 5000;
        
$frames_scanned  0;

        
$previousvalidframe $info['avdataoffset'];
        while (
$this->ftell() < $info['avdataend']) {
            
set_time_limit(30);
            
$head4 $this->fread(4);
            if (
strlen($head4) < 4) {
                break;
            }
            if (
$head4{0} != "\xFF") {
                for (
$i 1$i 4$i++) {
                    if (
$head4{$i} == "\xFF") {
                        
$this->fseek($i 4SEEK_CUR);
                        continue 
2;
                    }
                }
                continue;
            }
            if (!isset(
$MPEGaudioHeaderDecodeCache[$head4])) {
                
$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
            }
            if (!isset(
$MPEGaudioHeaderValidCache[$head4])) {
                
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], falsefalse);
            }
            if (
$MPEGaudioHeaderValidCache[$head4]) {

                if (!isset(
$MPEGaudioHeaderLengthCache[$head4])) {
                    
$LongMPEGversionLookup[$head4]   = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
                    
$LongMPEGlayerLookup[$head4]     = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
                    
$LongMPEGbitrateLookup[$head4]   = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
                    
$LongMPEGpaddingLookup[$head4]   = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
                    
$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
                    
$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
                        
$LongMPEGbitrateLookup[$head4],
                        
$LongMPEGversionLookup[$head4],
                        
$LongMPEGlayerLookup[$head4],
                        
$LongMPEGpaddingLookup[$head4],
                        
$LongMPEGfrequencyLookup[$head4]);
                }
                if (
$MPEGaudioHeaderLengthCache[$head4] > 4) {
                    
$WhereWeWere $this->ftell();
                    
$this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4SEEK_CUR);
                    
$next4 $this->fread(4);
                    if (
$next4{0} == "\xFF") {
                        if (!isset(
$MPEGaudioHeaderDecodeCache[$next4])) {
                            
$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
                        }
                        if (!isset(
$MPEGaudioHeaderValidCache[$next4])) {
                            
$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], falsefalse);
                        }
                        if (
$MPEGaudioHeaderValidCache[$next4]) {
                            
$this->fseek(-4SEEK_CUR);

                            
getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
                            
getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
                            
getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
                            
getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
                            
getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
                            if (
$max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
                                
$pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
                                
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned 1001).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
                                foreach (
$Distribution as $key1 => $value1) {
                                    foreach (
$value1 as $key2 => $value2) {
                                        
$Distribution[$key1][$key2] = round($value2 $pct_data_scanned);
                                    }
                                }
                                break;
                            }
                            continue;
                        }
                    }
                    unset(
$next4);
                    
$this->fseek($WhereWeWere 3);
                }

            }
        }
        foreach (
$Distribution as $key => $value) {
            
ksort($Distribution[$key], SORT_NUMERIC);
        }
        
ksort($Distribution['version'], SORT_STRING);
        
$info['mpeg']['audio']['bitrate_distribution']   = $Distribution['bitrate'];
        
$info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
        
$info['mpeg']['audio']['layer_distribution']     = $Distribution['layer'];
        
$info['mpeg']['audio']['version_distribution']   = $Distribution['version'];
        
$info['mpeg']['audio']['padding_distribution']   = $Distribution['padding'];
        if (
count($Distribution['version']) > 1) {
            
$info['error'][] = 'Corrupt file - more than one MPEG version detected';
        }
        if (
count($Distribution['layer']) > 1) {
            
$info['error'][] = 'Corrupt file - more than one MPEG layer detected';
        }
        if (
count($Distribution['frequency']) > 1) {
            
$info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
        }


        
$bittotal 0;
        foreach (
$Distribution['bitrate'] as $bitratevalue => $bitratecount) {
            if (
$bitratevalue != 'free') {
                
$bittotal += ($bitratevalue $bitratecount);
            }
        }
        
$info['mpeg']['audio']['frame_count']  = array_sum($Distribution['bitrate']);
        if (
$info['mpeg']['audio']['frame_count'] == 0) {
            
$info['error'][] = 'no MPEG audio frames found';
            return 
false;
        }
        
$info['mpeg']['audio']['bitrate']      = ($bittotal $info['mpeg']['audio']['frame_count']);
        
$info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' 'cbr');
        
$info['mpeg']['audio']['sample_rate']  = getid3_lib::array_max($Distribution['frequency'], true);

        
$info['audio']['bitrate']      = $info['mpeg']['audio']['bitrate'];
        
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
        
$info['audio']['sample_rate']  = $info['mpeg']['audio']['sample_rate'];
        
$info['audio']['dataformat']   = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
        
$info['fileformat']            = $info['audio']['dataformat'];

        return 
true;
    }


    public function 
getOnlyMPEGaudioInfo($avdataoffset$BitrateHistogram=false) {
        
// looks for synch, decodes MPEG audio header

        
$info = &$this->getid3->info;

        static 
$MPEGaudioVersionLookup;
        static 
$MPEGaudioLayerLookup;
        static 
$MPEGaudioBitrateLookup;
        if (empty(
$MPEGaudioVersionLookup)) {
           
$MPEGaudioVersionLookup self::MPEGaudioVersionArray();
           
$MPEGaudioLayerLookup   self::MPEGaudioLayerArray();
           
$MPEGaudioBitrateLookup self::MPEGaudioBitrateArray();

        }

        
$this->fseek($avdataoffset);
        
$sync_seek_buffer_size min(128 1024$info['avdataend'] - $avdataoffset);
        if (
$sync_seek_buffer_size <= 0) {
            
$info['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset;
            return 
false;
        }
        
$header $this->fread($sync_seek_buffer_size);
        
$sync_seek_buffer_size strlen($header);
        
$SynchSeekOffset 0;
        while (
$SynchSeekOffset $sync_seek_buffer_size) {
            if (((
$avdataoffset $SynchSeekOffset)  < $info['avdataend']) && !feof($this->getid3->fp)) {

                if (
$SynchSeekOffset $sync_seek_buffer_size) {
                    
// if a synch's not found within the first 128k bytes, then give up
                    
$info['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size 1024).'kB';
                    if (isset(
$info['audio']['bitrate'])) {
                        unset(
$info['audio']['bitrate']);
                    }
                    if (isset(
$info['mpeg']['audio'])) {
                        unset(
$info['mpeg']['audio']);
                    }
                    if (empty(
$info['mpeg'])) {
                        unset(
$info['mpeg']);
                    }
                    return 
false;

                } elseif (
feof($this->getid3->fp)) {

                    
$info['error'][] = 'Could not find valid MPEG audio synch before end of file';
                    if (isset(
$info['audio']['bitrate'])) {
                        unset(
$info['audio']['bitrate']);
                    }
                    if (isset(
$info['mpeg']['audio'])) {
                        unset(
$info['mpeg']['audio']);
                    }
                    if (isset(
$info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
                        unset(
$info['mpeg']);
                    }
                    return 
false;
                }
            }

            if ((
$SynchSeekOffset 1) >= strlen($header)) {
                
$info['error'][] = 'Could not find valid MPEG synch before end of file';
                return 
false;
            }

            if ((
$header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset 1)} > "\xE0")) { // synch detected
                
if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
                    
$FirstFrameThisfileInfo $info;
                    
$FirstFrameAVDataOffset $avdataoffset $SynchSeekOffset;
                    if (!
$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset$FirstFrameThisfileInfofalse)) {
                        
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
                        // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
                        
unset($FirstFrameThisfileInfo);
                    }
                }

                
$dummy $info// only overwrite real data if valid header found
                
if ($this->decodeMPEGaudioHeader($avdataoffset $SynchSeekOffset$dummytrue)) {
                    
$info $dummy;
                    
$info['avdataoffset'] = $avdataoffset $SynchSeekOffset;
                    switch (isset(
$info['fileformat']) ? $info['fileformat'] : '') {
                        case 
'':
                        case 
'id3':
                        case 
'ape':
                        case 
'mp3':
                            
$info['fileformat']          = 'mp3';
                            
$info['audio']['dataformat'] = 'mp3';
                            break;
                    }
                    if (isset(
$FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
                        if (!(
abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
                            
// If there is garbage data between a valid VBR header frame and a sequence
                            // of valid MPEG-audio frames the VBR data is no longer discarded.
                            
$info $FirstFrameThisfileInfo;
                            
$info['avdataoffset']        = $FirstFrameAVDataOffset;
                            
$info['fileformat']          = 'mp3';
                            
$info['audio']['dataformat'] = 'mp3';
                            
$dummy                       $info;
                            unset(
$dummy['mpeg']['audio']);
                            
$GarbageOffsetStart $FirstFrameAVDataOffset $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
                            
$GarbageOffsetEnd   $avdataoffset $SynchSeekOffset;
                            if (
$this->decodeMPEGaudioHeader($GarbageOffsetEnd$dummytruetrue)) {
                                
$info $dummy;
                                
$info['avdataoffset'] = $GarbageOffsetEnd;
                                
$info['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
                            } else {
                                
$info['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
                            }
                        }
                    }
                    if (isset(
$info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
                        
// VBR file with no VBR header
                        
$BitrateHistogram true;
                    }

                    if (
$BitrateHistogram) {

                        
$info['mpeg']['audio']['stereo_distribution']  = array('stereo'=>0'joint stereo'=>0'dual channel'=>0'mono'=>0);
                        
$info['mpeg']['audio']['version_distribution'] = array('1'=>0'2'=>0'2.5'=>0);

                        if (
$info['mpeg']['audio']['version'] == '1') {
                            if (
$info['mpeg']['audio']['layer'] == 3) {
                                
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>032000=>040000=>048000=>056000=>064000=>080000=>096000=>0112000=>0128000=>0160000=>0192000=>0224000=>0256000=>0320000=>0);
                            } elseif (
$info['mpeg']['audio']['layer'] == 2) {
                                
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>032000=>048000=>056000=>064000=>080000=>096000=>0112000=>0128000=>0160000=>0192000=>0224000=>0256000=>0320000=>0384000=>0);
                            } elseif (
$info['mpeg']['audio']['layer'] == 1) {
                                
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>032000=>064000=>096000=>0128000=>0160000=>0192000=>0224000=>0256000=>0288000=>0320000=>0352000=>0384000=>0416000=>0448000=>0);
                            }
                        } elseif (
$info['mpeg']['audio']['layer'] == 1) {
                            
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>032000=>048000=>056000=>064000=>080000=>096000=>0112000=>0128000=>0144000=>0160000=>0176000=>0192000=>0224000=>0256000=>0);
                        } else {
                            
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>08000=>016000=>024000=>032000=>040000=>048000=>056000=>064000=>080000=>096000=>0112000=>0128000=>0144000=>0160000=>0);
                        }

                        
$dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
                        
$synchstartoffset $info['avdataoffset'];
                        
$this->fseek($info['avdataoffset']);

                        
// you can play with these numbers:
                        
$max_frames_scan  50000;
                        
$max_scan_segments 10;

                        
// don't play with these numbers:
                        
$FastMode false;
                        
$SynchErrorsFound 0;
                        
$frames_scanned   0;
                        
$this_scan_segment 0;
                        
$frames_scan_per_segment ceil($max_frames_scan $max_scan_segments);
                        
$pct_data_scanned 0;
                        for (
$current_segment 0$current_segment $max_scan_segments$current_segment++) {
                            
$frames_scanned_this_segment 0;
                            if (
$this->ftell() >= $info['avdataend']) {
                                break;
                            }
                            
$scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
                            if (
$current_segment 0) {
                                
$this->fseek($scan_start_offset[$current_segment]);
                                
$buffer_4k $this->fread(4096);
                                for (
$j 0$j < (strlen($buffer_4k) - 4); $j++) {
                                    if ((
$buffer_4k{$j} == "\xFF") && ($buffer_4k{($j 1)} > "\xE0")) { // synch detected
                                        
if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j$dummyfalsefalse$FastMode)) {
                                            
$calculated_next_offset $scan_start_offset[$current_segment] + $j $dummy['mpeg']['audio']['framelength'];
                                            if (
$this->decodeMPEGaudioHeader($calculated_next_offset$dummyfalsefalse$FastMode)) {
                                                
$scan_start_offset[$current_segment] += $j;
                                                break;
                                            }
                                        }
                                    }
                                }
                            }
                            
$synchstartoffset $scan_start_offset[$current_segment];
                            while (
$this->decodeMPEGaudioHeader($synchstartoffset$dummyfalsefalse$FastMode)) {
                                
$FastMode true;
                                
$thisframebitrate $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];

                                if (empty(
$dummy['mpeg']['audio']['framelength'])) {
                                    
$SynchErrorsFound++;
                                    
$synchstartoffset++;
                                } else {
                                    
getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
                                    
getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
                                    
getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
                                    
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
                                }
                                
$frames_scanned++;
                                if (
$frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
                                    
$this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
                                    if ((
$current_segment == 0) && (($this_pct_scanned $max_scan_segments) >= 1)) {
                                        
// file likely contains < $max_frames_scan, just scan as one segment
                                        
$max_scan_segments 1;
                                        
$frames_scan_per_segment $max_frames_scan;
                                    } else {
                                        
$pct_data_scanned += $this_pct_scanned;
                                        break;
                                    }
                                }
                            }
                        }
                        if (
$pct_data_scanned 0) {
                            
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned 1001).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
                            foreach (
$info['mpeg']['audio'] as $key1 => $value1) {
                                if (!
preg_match('#_distribution$#i'$key1)) {
                                    continue;
                                }
                                foreach (
$value1 as $key2 => $value2) {
                                    
$info['mpeg']['audio'][$key1][$key2] = round($value2 $pct_data_scanned);
                                }
                            }
                        }

                        if (
$SynchErrorsFound 0) {
                            
$info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
                            
//return false;
                        
}

                        
$bittotal     0;
                        
$framecounter 0;
                        foreach (
$info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
                            
$framecounter += $bitratecount;
                            if (
$bitratevalue != 'free') {
                                
$bittotal += ($bitratevalue $bitratecount);
                            }
                        }
                        if (
$framecounter == 0) {
                            
$info['error'][] = 'Corrupt MP3 file: framecounter == zero';
                            return 
false;
                        }
                        
$info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
                        
$info['mpeg']['audio']['bitrate']     = ($bittotal $framecounter);

                        
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];


                        
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
                        
$distinct_bitrates 0;
                        foreach (
$info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
                            if (
$bitrate_count 0) {
                                
$distinct_bitrates++;
                            }
                        }
                        if (
$distinct_bitrates 1) {
                            
$info['mpeg']['audio']['bitrate_mode'] = 'vbr';
                        } else {
                            
$info['mpeg']['audio']['bitrate_mode'] = 'cbr';
                        }
                        
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];

                    }

                    break; 
// exit while()
                
}
            }

            
$SynchSeekOffset++;
            if ((
$avdataoffset $SynchSeekOffset) >= $info['avdataend']) {
                
// end of file/data

                
if (empty($info['mpeg']['audio'])) {

                    
$info['error'][] = 'could not find valid MPEG synch before end of file';
                    if (isset(
$info['audio']['bitrate'])) {
                        unset(
$info['audio']['bitrate']);
                    }
                    if (isset(
$info['mpeg']['audio'])) {
                        unset(
$info['mpeg']['audio']);
                    }
                    if (isset(
$info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
                        unset(
$info['mpeg']);
                    }
                    return 
false;

                }
                break;
            }

        }
        
$info['audio']['channels']        = $info['mpeg']['audio']['channels'];
        
$info['audio']['channelmode']     = $info['mpeg']['audio']['channelmode'];
        
$info['audio']['sample_rate']     = $info['mpeg']['audio']['sample_rate'];
        return 
true;
    }


    public static function 
MPEGaudioVersionArray() {
        static 
$MPEGaudioVersion = array('2.5'false'2''1');
        return 
$MPEGaudioVersion;
    }

    public static function 
MPEGaudioLayerArray() {
        static 
$MPEGaudioLayer = array(false321);
        return 
$MPEGaudioLayer;
    }

    public static function 
MPEGaudioBitrateArray() {
        static 
$MPEGaudioBitrate;
        if (empty(
$MPEGaudioBitrate)) {
            
$MPEGaudioBitrate = array (
                
'1'  =>  array (=> array('free'320006400096000128000160000192000224000256000288000320000352000384000416000448000),
                                
=> array('free'320004800056000,  64000,  80000,  96000112000128000160000192000224000256000320000384000),
                                
=> array('free'320004000048000,  56000,  64000,  80000,  96000112000128000160000192000224000256000320000)
                               ),

                
'2'  =>  array (=> array('free'320004800056000,  64000,  80000,  96000112000128000144000160000176000192000224000256000),
                                
=> array('free',  80001600024000,  32000,  40000,  48000,  56000,  64000,  80000,  96000112000128000144000160000),
                               )
            );
            
$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
            
$MPEGaudioBitrate['2.5']  = $MPEGaudioBitrate['2'];
        }
        return 
$MPEGaudioBitrate;
    }

    public static function 
MPEGaudioFrequencyArray() {
        static 
$MPEGaudioFrequency;
        if (empty(
$MPEGaudioFrequency)) {
            
$MPEGaudioFrequency = array (
                
'1'   => array(441004800032000),
                
'2'   => array(220502400016000),
                
'2.5' => array(1102512000,  8000)
            );
        }
        return 
$MPEGaudioFrequency;
    }

    public static function 
MPEGaudioChannelModeArray() {
        static 
$MPEGaudioChannelMode = array('stereo''joint stereo''dual channel''mono');
        return 
$MPEGaudioChannelMode;
    }

    public static function 
MPEGaudioModeExtensionArray() {
        static 
$MPEGaudioModeExtension;
        if (empty(
$MPEGaudioModeExtension)) {
            
$MPEGaudioModeExtension = array (
                
=> array('4-31''8-31''12-31''16-31'),
                
=> array('4-31''8-31''12-31''16-31'),
                
=> array('''IS''MS''IS+MS')
            );
        }
        return 
$MPEGaudioModeExtension;
    }

    public static function 
MPEGaudioEmphasisArray() {
        static 
$MPEGaudioEmphasis = array('none''50/15ms'false'CCIT J.17');
        return 
$MPEGaudioEmphasis;
    }

    public static function 
MPEGaudioHeaderBytesValid($head4$allowBitrate15=false) {
        return 
self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false$allowBitrate15);
    }

    public static function 
MPEGaudioHeaderValid($rawarray$echoerrors=false$allowBitrate15=false) {
        if ((
$rawarray['synch'] & 0x0FFE) != 0x0FFE) {
            return 
false;
        }

        static 
$MPEGaudioVersionLookup;
        static 
$MPEGaudioLayerLookup;
        static 
$MPEGaudioBitrateLookup;
        static 
$MPEGaudioFrequencyLookup;
        static 
$MPEGaudioChannelModeLookup;
        static 
$MPEGaudioModeExtensionLookup;
        static 
$MPEGaudioEmphasisLookup;
        if (empty(
$MPEGaudioVersionLookup)) {
            
$MPEGaudioVersionLookup       self::MPEGaudioVersionArray();
            
$MPEGaudioLayerLookup         self::MPEGaudioLayerArray();
            
$MPEGaudioBitrateLookup       self::MPEGaudioBitrateArray();
            
$MPEGaudioFrequencyLookup     self::MPEGaudioFrequencyArray();
            
$MPEGaudioChannelModeLookup   self::MPEGaudioChannelModeArray();
            
$MPEGaudioModeExtensionLookup self::MPEGaudioModeExtensionArray();
            
$MPEGaudioEmphasisLookup      self::MPEGaudioEmphasisArray();
        }

        if (isset(
$MPEGaudioVersionLookup[$rawarray['version']])) {
            
$decodedVersion $MPEGaudioVersionLookup[$rawarray['version']];
        } else {
            echo (
$echoerrors "\n".'invalid Version ('.$rawarray['version'].')' '');
            return 
false;
        }
        if (isset(
$MPEGaudioLayerLookup[$rawarray['layer']])) {
            
$decodedLayer $MPEGaudioLayerLookup[$rawarray['layer']];
        } else {
            echo (
$echoerrors "\n".'invalid Layer ('.$rawarray['layer'].')' '');
            return 
false;
        }
        if (!isset(
$MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
            echo (
$echoerrors "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' '');
            if (
$rawarray['bitrate'] == 15) {
                
// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
                // let it go through here otherwise file will not be identified
                
if (!$allowBitrate15) {
                    return 
false;
                }
            } else {
                return 
false;
            }
        }
        if (!isset(
$MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
            echo (
$echoerrors "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' '');
            return 
false;
        }
        if (!isset(
$MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
            echo (
$echoerrors "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' '');
            return 
false;
        }
        if (!isset(
$MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
            echo (
$echoerrors "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' '');
            return 
false;
        }
        if (!isset(
$MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
            echo (
$echoerrors "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' '');
            return 
false;
        }
        
// These are just either set or not set, you can't mess that up :)
        // $rawarray['protection'];
        // $rawarray['padding'];
        // $rawarray['private'];
        // $rawarray['copyright'];
        // $rawarray['original'];

        
return true;
    }

    public static function 
MPEGaudioHeaderDecode($Header4Bytes) {
        
// AAAA AAAA  AAAB BCCD  EEEE FFGH  IIJJ KLMM
        // A - Frame sync (all bits set)
        // B - MPEG Audio version ID
        // C - Layer description
        // D - Protection bit
        // E - Bitrate index
        // F - Sampling rate frequency index
        // G - Padding bit
        // H - Private bit
        // I - Channel Mode
        // J - Mode extension (Only if Joint stereo)
        // K - Copyright
        // L - Original
        // M - Emphasis

        
if (strlen($Header4Bytes) != 4) {
            return 
false;
        }

        
$MPEGrawHeader['synch']         = (getid3_lib::BigEndian2Int(substr($Header4Bytes02)) & 0xFFE0) >> 4;
        
$MPEGrawHeader['version']       = (ord($Header4Bytes{1}) & 0x18) >> 3//    BB
        
$MPEGrawHeader['layer']         = (ord($Header4Bytes{1}) & 0x06) >> 1//      CC
        
$MPEGrawHeader['protection']    = (ord($Header4Bytes{1}) & 0x01);      //        D
        
$MPEGrawHeader['bitrate']       = (ord($Header4Bytes{2}) & 0xF0) >> 4// EEEE
        
$MPEGrawHeader['sample_rate']   = (ord($Header4Bytes{2}) & 0x0C) >> 2//     FF
        
$MPEGrawHeader['padding']       = (ord($Header4Bytes{2}) & 0x02) >> 1//       G
        
$MPEGrawHeader['private']       = (ord($Header4Bytes{2}) & 0x01);      //        H
        
$MPEGrawHeader['channelmode']   = (ord($Header4Bytes{3}) & 0xC0) >> 6// II
        
$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4//   JJ
        
$MPEGrawHeader['copyright']     = (ord($Header4Bytes{3}) & 0x08) >> 3//     K
        
$MPEGrawHeader['original']      = (ord($Header4Bytes{3}) & 0x04) >> 2//      L
        
$MPEGrawHeader['emphasis']      = (ord($Header4Bytes{3}) & 0x03);      //       MM

        
return $MPEGrawHeader;
    }

    public static function 
MPEGaudioFrameLength(&$bitrate, &$version, &$layer$padding, &$samplerate) {
        static 
$AudioFrameLengthCache = array();

        if (!isset(
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
            
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
            if (
$bitrate != 'free') {

                if (
$version == '1') {

                    if (
$layer == '1') {

                        
// For Layer I slot is 32 bits long
                        
$FrameLengthCoefficient 48;
                        
$SlotLength 4;

                    } else { 
// Layer 2 / 3

                        // for Layer 2 and Layer 3 slot is 8 bits long.
                        
$FrameLengthCoefficient 144;
                        
$SlotLength 1;

                    }

                } else { 
// MPEG-2 / MPEG-2.5

                    
if ($layer == '1') {

                        
// For Layer I slot is 32 bits long
                        
$FrameLengthCoefficient 24;
                        
$SlotLength 4;

                    } elseif (
$layer == '2') {

                        
// for Layer 2 and Layer 3 slot is 8 bits long.
                        
$FrameLengthCoefficient 144;
                        
$SlotLength 1;

                    } else { 
// layer 3

                        // for Layer 2 and Layer 3 slot is 8 bits long.
                        
$FrameLengthCoefficient 72;
                        
$SlotLength 1;

                    }

                }

                
// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
                
if ($samplerate 0) {
                    
$NewFramelength  = ($FrameLengthCoefficient $bitrate) / $samplerate;
                    
$NewFramelength  floor($NewFramelength $SlotLength) * $SlotLength// round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
                    
if ($padding) {
                        
$NewFramelength += $SlotLength;
                    }
                    
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
                }
            }
        }
        return 
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
    }

    public static function 
ClosestStandardMP3Bitrate($bit_rate) {
        static 
$standard_bit_rates = array (3200002560002240001920001600001280001120009600080000640005600048000400003200024000160008000);
        static 
$bit_rate_table = array (0=>'-');
        
$round_bit_rate intval(round($bit_rate, -3));
        if (!isset(
$bit_rate_table[$round_bit_rate])) {
            if (
$round_bit_rate max($standard_bit_rates)) {
                
$bit_rate_table[$round_bit_rate] = round($bit_ratestrlen($bit_rate));
            } else {
                
$bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
                foreach (
$standard_bit_rates as $standard_bit_rate) {
                    if (
$round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
                        break;
                    }
                    
$bit_rate_table[$round_bit_rate] = $standard_bit_rate;
                }
            }
        }
        return 
$bit_rate_table[$round_bit_rate];
    }

    public static function 
XingVBRidOffset($version$channelmode) {
        static 
$XingVBRidOffsetCache = array();
        if (empty(
$XingVBRidOffset)) {
            
$XingVBRidOffset = array (
                
'1'   => array ('mono'          => 0x15// 4 + 17 = 21
                                
'stereo'        => 0x24// 4 + 32 = 36
                                
'joint stereo'  => 0x24,
                                
'dual channel'  => 0x24
                               
),

                
'2'   => array ('mono'          => 0x0D// 4 +  9 = 13
                                
'stereo'        => 0x15// 4 + 17 = 21
                                
'joint stereo'  => 0x15,
                                
'dual channel'  => 0x15
                               
),

                
'2.5' => array ('mono'          => 0x15,
                                
'stereo'        => 0x15,
                                
'joint stereo'  => 0x15,
                                
'dual channel'  => 0x15
                               
)
            );
        }
        return 
$XingVBRidOffset[$version][$channelmode];
    }

    public static function 
LAMEvbrMethodLookup($VBRmethodID) {
        static 
$LAMEvbrMethodLookup = array(
            
0x00 => 'unknown',
            
0x01 => 'cbr',
            
0x02 => 'abr',
            
0x03 => 'vbr-old / vbr-rh',
            
0x04 => 'vbr-new / vbr-mtrh',
            
0x05 => 'vbr-mt',
            
0x06 => 'vbr (full vbr method 4)',
            
0x08 => 'cbr (constant bitrate 2 pass)',
            
0x09 => 'abr (2 pass)',
            
0x0F => 'reserved'
        
);
        return (isset(
$LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
    }

    public static function 
LAMEmiscStereoModeLookup($StereoModeID) {
        static 
$LAMEmiscStereoModeLookup = array(
            
=> 'mono',
            
=> 'stereo',
            
=> 'dual mono',
            
=> 'joint stereo',
            
=> 'forced stereo',
            
=> 'auto',
            
=> 'intensity stereo',
            
=> 'other'
        
);
        return (isset(
$LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
    }

    public static function 
LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
        static 
$LAMEmiscSourceSampleFrequencyLookup = array(
            
=> '<= 32 kHz',
            
=> '44.1 kHz',
            
=> '48 kHz',
            
=> '> 48kHz'
        
);
        return (isset(
$LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
    }

    public static function 
LAMEsurroundInfoLookup($SurroundInfoID) {
        static 
$LAMEsurroundInfoLookup = array(
            
=> 'no surround info',
            
=> 'DPL encoding',
            
=> 'DPL2 encoding',
            
=> 'Ambisonic encoding'
        
);
        return (isset(
$LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
    }

    public static function 
LAMEpresetUsedLookup($LAMEtag) {

        if (
$LAMEtag['preset_used_id'] == 0) {
            
// no preset used (LAME >=3.93)
            // no preset recorded (LAME <3.93)
            
return '';
        }
        
$LAMEpresetUsedLookup = array();

        
/////  THIS PART CANNOT BE STATIC .
        
for ($i 8$i <= 320$i++) {
            switch (
$LAMEtag['vbr_method']) {
                case 
'cbr':
                    
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
                    break;
                case 
'abr':
                default: 
// other VBR modes shouldn't be here(?)
                    
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
                    break;
            }
        }

        
// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()

        // named alt-presets
        
$LAMEpresetUsedLookup[1000] = '--r3mix';
        
$LAMEpresetUsedLookup[1001] = '--alt-preset standard';
        
$LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
        
$LAMEpresetUsedLookup[1003] = '--alt-preset insane';
        
$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
        
$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
        
$LAMEpresetUsedLookup[1006] = '--alt-preset medium';
        
$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';

        
// LAME 3.94 additions/changes
        
$LAMEpresetUsedLookup[1010] = '--preset portable';                                                           // 3.94a15 Oct 21 2003
        
$LAMEpresetUsedLookup[1015] = '--preset radio';                                                              // 3.94a15 Oct 21 2003

        
$LAMEpresetUsedLookup[320]  = '--preset insane';                                                             // 3.94a15 Nov 12 2003
        
$LAMEpresetUsedLookup[410]  = '-V9';
        
$LAMEpresetUsedLookup[420]  = '-V8';
        
$LAMEpresetUsedLookup[440]  = '-V6';
        
$LAMEpresetUsedLookup[430]  = '--preset radio';                                                              // 3.94a15 Nov 12 2003
        
$LAMEpresetUsedLookup[450]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' '').'portable';  // 3.94a15 Nov 12 2003
        
$LAMEpresetUsedLookup[460]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' '').'medium';    // 3.94a15 Nov 12 2003
        
$LAMEpresetUsedLookup[470]  = '--r3mix';                                                                     // 3.94b1  Dec 18 2003
        
$LAMEpresetUsedLookup[480]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' '').'standard';  // 3.94a15 Nov 12 2003
        
$LAMEpresetUsedLookup[490]  = '-V1';
        
$LAMEpresetUsedLookup[500]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' '').'extreme';   // 3.94a15 Nov 12 2003

        
return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
    }

}