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Dosya Düzenle: module.audio.mp3.php

<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at https://github.com/JamesHeinrich/getID3       //
//            or https://www.getid3.org                        //
//            or http://getid3.sourceforge.net                 //
//  see readme.txt for more details                            //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio.mp3.php                                        //
// module for analyzing MP3 files                              //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}

class getid3_mp3 extends getid3_handler
{
	/**
	 * 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-unusable files.
	 *
	 * @var bool
	 */
	public $allow_bruteforce = false;

/**
	 * 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
	 *
	 * @var int
	 */
	public $mp3_valid_check_frames = 50;

/**
	 * @return bool
	 */
	public function Analyze() {
		$info = &$this->getid3->info;

$initialOffset = $info['avdataoffset'];

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

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

$CurrentDataLAMEversionString = null;
		if (((isset($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.';

}

}
			$this->warning($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($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
			// a version number of LAME that does not end with a number like "LAME3.92"
			// or with a closing parenthesis like "LAME3.88 (alpha)"
			// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)

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

// Not sure what version of LAME this is - look in padding of last frame for longer version string
			$PossibleLAMEversionStringOffset = $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
					$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
					break;
			}
			if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
				if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
					$PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3"  "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
					if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
						if (!empty($info['audio']['encoder']) && !empty($info['mpeg']['audio']['LAME']['short_version']) && ($info['audio']['encoder'] == $info['mpeg']['audio']['LAME']['short_version'])) {
							if (preg_match('#^LAME[0-9\\.]+#', $PossiblyLongerLAMEversion_NewString, $matches)) {
								// "LAME3.100" -> "LAME3.100.1", but avoid including "(alpha)" and similar
								$info['mpeg']['audio']['LAME']['short_version'] = $matches[0];
							}
						}
						$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:
					$this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$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)) {
			// https://github.com/JamesHeinrich/getID3/issues/161
			// VBR header frame contains ~0.026s of silent audio data, but is not actually part of the original encoding and should be ignored
			$xingVBRheaderFrameLength = ((isset($info['mpeg']['audio']['VBR_frames']) && isset($info['mpeg']['audio']['framelength'])) ? $info['mpeg']['audio']['framelength'] : 0);

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

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

return true;
	}

/**
	 * @return string
	 */
	public function GuessEncoderOptions() {
		// shortcuts
		$info = &$this->getid3->info;
		$thisfile_mpeg_audio = array();
		$thisfile_mpeg_audio_lame = array();
		if (!empty($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(16, 24, 40, 56, 112, 128, 160, 192, 256);

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($thisfile_mpeg_audio_lame['preset_used']) && isset($thisfile_mpeg_audio_lame['preset_used_id']) && (!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 ($info['audio']['bitrate_mode'] == 'cbr') {
				if ($info['audio']['bitrate'] == 'free') {
					$encoder_options = strtoupper($info['audio']['bitrate_mode']);
				} else {
					$encoder_options = strtoupper($info['audio']['bitrate_mode']).round($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 (isset($thisfile_mpeg_audio['bitrate']) && ($thisfile_mpeg_audio['bitrate'] === 'free')) {
			$encoder_options .= ' --freeformat';
		}

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(' ', $encoder_options, 4);
			if ($ExplodedOptions[0] == '--r3mix') {
				$ExplodedOptions[1] = 'r3mix';
			}
			switch ($ExplodedOptions[0]) {
				case '--preset':
				case '--alt-preset':
				case '--r3mix':
					if ($ExplodedOptions[1] == 'fast') {
						$ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
					}
					switch ($ExplodedOptions[1]) {
						case 'portable':
						case 'medium':
						case 'standard':
						case 'extreme':
						case 'insane':
						case 'fast portable':
						case 'fast medium':
						case 'fast standard':
						case 'fast extreme':
						case 'fast insane':
						case 'r3mix':
							static $ExpectedLowpass = array(
									'insane|20500'        => 20500,
									'insane|20600'        => 20600,  // 3.90.2, 3.90.3, 3.91
									'medium|18000'        => 18000,
									'fast medium|18000'   => 18000,
									'extreme|19500'       => 19500,  // 3.90,   3.90.1, 3.92, 3.95
									'extreme|19600'       => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1
									'fast extreme|19500'  => 19500,  // 3.90,   3.90.1, 3.92, 3.95
									'fast extreme|19600'  => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1
									'standard|19000'      => 19000,
									'fast standard|19000' => 19000,
									'r3mix|19500'         => 19500,  // 3.90,   3.90.1, 3.92
									'r3mix|19600'         => 19600,  // 3.90.2, 3.90.3, 3.91
									'r3mix|18000'         => 18000,  // 3.94,   3.95
								);
							if (!isset($ExpectedLowpass[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) {
								$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
							}
							break;

default:
							break;
					}
					break;
			}
		}

if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
			if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
				$encoder_options .= ' --resample 44100';
			} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
				$encoder_options .= ' --resample 48000';
			} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
				switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
					case 0: // <= 32000
						// may or may not be same as source frequency - ignore
						break;
					case 1: // 44100
					case 2: // 48000
					case 3: // 48000+
						$ExplodedOptions = explode(' ', $encoder_options, 4);
						switch ($ExplodedOptions[0]) {
							case '--preset':
							case '--alt-preset':
								switch ($ExplodedOptions[1]) {
									case 'fast':
									case 'portable':
									case 'medium':
									case 'standard':
									case 'extreme':
									case 'insane':
										$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
										break;

default:
										static $ExpectedResampledRate = array(
												'phon+/lw/mw-eu/sw|16000' => 16000,
												'mw-us|24000'             => 24000, // 3.95
												'mw-us|32000'             => 32000, // 3.93
												'mw-us|16000'             => 16000, // 3.92
												'phone|16000'             => 16000,
												'phone|11025'             => 11025, // 3.94a15
												'radio|32000'             => 32000, // 3.94a15
												'fm/radio|32000'          => 32000, // 3.92
												'fm|32000'                => 32000, // 3.90
												'voice|32000'             => 32000);
										if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
											$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
										}
										break;
								}
								break;

case '--r3mix':
							default:
								$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
								break;
						}
						break;
				}
			}
		}
		if (empty($encoder_options) && !empty($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;
	}

/**
	 * @param int   $offset
	 * @param array $info
	 * @param bool  $recursivesearch
	 * @param bool  $ScanAsCBR
	 * @param bool  $FastMPEGheaderScan
	 *
	 * @return bool
	 */
	public function decodeMPEGaudioHeader($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) {
			$this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$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

$head4 = substr($headerstring, 0, 4);
		$head4_key = getid3_lib::PrintHexBytes($head4, true, false, false);
		static $MPEGaudioHeaderDecodeCache = array();
		if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) {
			$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key];
		} else {
			$MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
			$MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray;
		}

static $MPEGaudioHeaderValidCache = array();
		if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache
			//$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true);  // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
			$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
		}

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

if ($MPEGaudioHeaderValidCache[$head4_key]) {
			$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
		} else {
			$this->warning('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($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') ? 1 : 2);
			$thisfile_mpeg_audio['sample_rate']   = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
			$thisfile_mpeg_audio['protection']    = !$thisfile_mpeg_audio['raw']['protection'];
			$thisfile_mpeg_audio['private']       = (bool) $thisfile_mpeg_audio['raw']['private'];
			$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
			$thisfile_mpeg_audio['copyright']     = (bool) $thisfile_mpeg_audio['raw']['copyright'];
			$thisfile_mpeg_audio['original']      = (bool) $thisfile_mpeg_audio['raw']['original'];
			$thisfile_mpeg_audio['emphasis']      = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];

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

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

if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
			// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
			$this->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 {
						$this->error($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 {
						$this->error(intval(round($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 {
				$this->error('Frame at offset('.$offset.') is has an invalid frame length.');
				return false;
			}

}

$ExpectedNumberOfAudioBytes = 0;

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

if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
			// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
			// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html

$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
			$thisfile_mpeg_audio['VBR_method']   = 'Fraunhofer';
			$info['audio']['codec']              = 'Fraunhofer';

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

$FraunhoferVBROffset = 36;

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

$ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];

$previousbyteoffset = $offset;
			for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
				$Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
				$FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
				$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
				$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
				$previousbyteoffset += $Fraunhofer_OffsetN;
			}

} else {

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

$VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
			$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);

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

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

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

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

$thisfile_mpeg_audio['xing_flags']['frames']    = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
				$thisfile_mpeg_audio['xing_flags']['bytes']     = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
				$thisfile_mpeg_audio['xing_flags']['toc']       = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
				$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);

if ($thisfile_mpeg_audio['xing_flags']['frames']) {
					$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset +  8, 4));
					//$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
				}
				if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
					$thisfile_mpeg_audio['VBR_bytes']  = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
				}

//if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
				//if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
				if (!empty($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'];
						$used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0);
						$used_filesize -= (isset($info['id3v1']) ? 128 : 0);
						$used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
						$this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($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'] * (2 / $info['audio']['channels']) / 12;
					} else {
						// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
						//$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
						$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
					}
					$thisfile_mpeg_audio['framelength'] = (int) floor($framelengthfloat);
				}

if ($thisfile_mpeg_audio['xing_flags']['toc']) {
					$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
					for ($i = 0; $i < 100; $i++) {
						$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]);
					}
				}
				if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
					$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
				}

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

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

$thisfile_mpeg_audio_lame['long_version']  = substr($headerstring, $VBRidOffset + 120, 20);
					$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);

//$thisfile_mpeg_audio_lame['numeric_version'] = str_replace('LAME', '', $thisfile_mpeg_audio_lame['short_version']);
					$thisfile_mpeg_audio_lame['numeric_version'] = '';
					if (preg_match('#^LAME([0-9\\.a-z]*)#', $thisfile_mpeg_audio_lame['long_version'], $matches)) {
						$thisfile_mpeg_audio_lame['short_version']   = $matches[0];
						$thisfile_mpeg_audio_lame['numeric_version'] = $matches[1];
					}
					if (strlen($thisfile_mpeg_audio_lame['numeric_version']) > 0) {
						foreach (explode('.', $thisfile_mpeg_audio_lame['numeric_version']) as $key => $number) {
							$thisfile_mpeg_audio_lame['integer_version'][$key] = intval($number);
						}
						//if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
						if ((($thisfile_mpeg_audio_lame['integer_version'][0] * 1000) + $thisfile_mpeg_audio_lame['integer_version'][1]) >= 3090) { // cannot use string version compare, may have "LAME3.90" or "LAME3.100" -- see https://github.com/JamesHeinrich/getID3/issues/207

// 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
							// https://wiki.hydrogenaud.io/index.php/LAME#VBR_header_and_LAME_tag
							// https://hydrogenaud.io/index.php?topic=9933

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

// shortcuts
							$thisfile_mpeg_audio_lame['RGAD']    = array('track'=>array(), 'album'=>array());
							$thisfile_mpeg_audio_lame_RGAD       = &$thisfile_mpeg_audio_lame['RGAD'];
							$thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
							$thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
							$thisfile_mpeg_audio_lame['raw'] = array();
							$thisfile_mpeg_audio_lame_raw    = &$thisfile_mpeg_audio_lame['raw'];

// byte $9B  VBR Quality
							// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
							// Actually overwrites original Xing bytes
							unset($thisfile_mpeg_audio['VBR_scale']);
							$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));

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

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

$thisfile_mpeg_audio_lame['tag_revision']   = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
							$thisfile_mpeg_audio_lame_raw['vbr_method'] =  $LAMEtagRevisionVBRmethod & 0x0F;
							$thisfile_mpeg_audio_lame['vbr_method']     = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
							$thisfile_mpeg_audio['bitrate_mode']        = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'

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

// bytes $A7-$AE  Replay Gain
							// https://web.archive.org/web/20021015212753/http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
							// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
							if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
								// LAME 3.94a16 and later - 9.23 fixed point
								// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
								$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
							} else {
								// LAME 3.94a15 and earlier - 32-bit floating point
								// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
								$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
							}
							if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
								unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
							} else {
								$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
							}

$thisfile_mpeg_audio_lame_raw['RGAD_track']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
							$thisfile_mpeg_audio_lame_raw['RGAD_album']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));

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 + 0xAF, 1));
							$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune']   = (bool) ($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, $LAMEtagOffsetContant + 0xB0, 1));
							if ($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 + 0xB1, 3));
							$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
							$thisfile_mpeg_audio_lame['end_padding']   =  $EncoderDelays & 0x000FFF;

// byte $B4  Misc
							$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
							$thisfile_mpeg_audio_lame_raw['noise_shaping']       = ($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 + 0xB5, 1), false, true);
							$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, $LAMEtagOffsetContant + 0xB6, 2));
							// Reserved                                                    = ($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'])) {
								$this->warning('Unknown LAME preset used ('.$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 + 0xB8, 4));
							$ExpectedNumberOfAudioBytes = (($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 + 0xBC, 2));

// bytes $BE-$BF  CRC-16 of Info Tag
							$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));

// LAME CBR
							if (($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) && ($thisfile_mpeg_audio['bitrate'] !== 'free')) {

$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, $nextframetestoffset, true)) {
						$recursivesearch = false;
						$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
					}
					if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
						$this->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']--;
				//		$this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored');
				//	} else {
				//		$this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
				//	}
				} else {
					$this->warning('Too much data in file: expecting '.$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 = $this->FreeFormatFrameLength($offset, true);
				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 {
					$this->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, $ScanAsCBR)) {
				return false;
			}
			if (!empty($this->getid3->info['mp3_validity_check_bitrates']) && !empty($thisfile_mpeg_audio['bitrate_mode']) && ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') && !empty($thisfile_mpeg_audio['VBR_bitrate'])) {
				// https://github.com/JamesHeinrich/getID3/issues/287
				if (count(array_keys($this->getid3->info['mp3_validity_check_bitrates'])) == 1) {
					list($cbr_bitrate_in_short_scan) = array_keys($this->getid3->info['mp3_validity_check_bitrates']);
					$deviation_cbr_from_header_bitrate = abs($thisfile_mpeg_audio['VBR_bitrate'] - $cbr_bitrate_in_short_scan) / $cbr_bitrate_in_short_scan;
					if ($deviation_cbr_from_header_bitrate < 0.01) {
						// VBR header bitrate may differ slightly from true bitrate of frames, perhaps accounting for overhead of VBR header frame itself?
						// If measured CBR bitrate is within 1% of specified bitrate in VBR header then assume that file is truly CBR
						$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
						//$this->warning('VBR header ignored, assuming CBR '.round($cbr_bitrate_in_short_scan / 1000).'kbps based on scan of '.$this->mp3_valid_check_frames.' frames');
					}
				}
			}
			if (isset($this->getid3->info['mp3_validity_check_bitrates'])) {
				unset($this->getid3->info['mp3_validity_check_bitrates']);
			}

}

//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;
	}

/**
	 * @param int $offset
	 * @param int $nextframetestoffset
	 * @param bool $ScanAsCBR
	 *
	 * @return bool
	 */
	public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
		$info = &$this->getid3->info;
		$firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
		$this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);

$info['mp3_validity_check_bitrates'] = array();
		for ($i = 0; $i < $this->mp3_valid_check_frames; $i++) {
			// check next (default: 50) frames for validity, to make sure we haven't run across a false synch
			if (($nextframetestoffset + 4) >= $info['avdataend']) {
				// end of file
				return true;
			}

$nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
			if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
				getid3_lib::safe_inc($info['mp3_validity_check_bitrates'][intval($nextframetestarray['mpeg']['audio']['bitrate'])]);
				if ($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 += (int) $nextframetestarray['mpeg']['audio']['framelength'];
				} else {
					$this->error('Frame at offset ('.$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
				$this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.');

return false;
			}
		}
		return true;
	}

/**
	 * @param int  $offset
	 * @param bool $deepscan
	 *
	 * @return int|false
	 */
	public function FreeFormatFrameLength($offset, $deepscan=false) {
		$info = &$this->getid3->info;

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

$SyncPattern1 = substr($MPEGaudioData, 0, 4);
		// 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, $SyncPattern1, 4);
		$framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
		if ($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
			$framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
			$framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);

if ($framelength1 > 4) {
				$framelength = $framelength1;
			}
			if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
				$framelength = $framelength2;
			}
			if (!$framelength) {
				$this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset);
				return false;
			} else {
				$this->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';
				$SyncPattern1 = substr($SyncPattern1, 0, 3);
				$SyncPattern2 = substr($SyncPattern2, 0, 3);
			}
		}

if ($deepscan) {

$ActualFrameLengthValues = array();
			$nextoffset = $offset + $framelength;
			while ($nextoffset < ($info['avdataend'] - 6)) {
				$this->fseek($nextoffset - 1);
				$NextSyncPattern = $this->fread(6);
				if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
					// good - found where expected
					$ActualFrameLengthValues[] = $framelength;
				} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
					// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
					$ActualFrameLengthValues[] = ($framelength - 1);
					$nextoffset--;
				} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
					// ok - found one byte later than expected (last frame was padded, first frame wasn't)
					$ActualFrameLengthValues[] = ($framelength + 1);
					$nextoffset++;
				} else {
					$this->error('Did not find expected free-format sync pattern at offset '.$nextoffset);
					return false;
				}
				$nextoffset += $framelength;
			}
			if (count($ActualFrameLengthValues) > 0) {
				$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
			}
		}
		return $framelength;
	}

/**
	 * @return bool
	 */
	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                 = 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 - 4, SEEK_CUR);
						continue 2;
					}
				}
				continue;
			}
			if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
				$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
			}
			if (!isset($MPEGaudioHeaderValidCache[$head4])) {
				$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
			}
			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] - 4, SEEK_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], false, false);
						}
						if ($MPEGaudioHeaderValidCache[$next4]) {
							$this->fseek(-4, SEEK_CUR);

$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] = isset($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]) ? ++$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]] : 1;
							$Distribution['layer'][$LongMPEGlayerLookup[$head4]] = isset($Distribution['layer'][$LongMPEGlayerLookup[$head4]]) ? ++$Distribution['layer'][$LongMPEGlayerLookup[$head4]] : 1;
							$Distribution['version'][$LongMPEGversionLookup[$head4]] = isset($Distribution['version'][$LongMPEGversionLookup[$head4]]) ? ++$Distribution['version'][$LongMPEGversionLookup[$head4]] : 1;
							$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] = isset($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]) ? ++$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])] : 1;
							$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] = isset($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]) ? ++$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]] : 1;
							if (++$frames_scanned >= $max_frames_scan) {
								$pct_data_scanned = getid3_lib::SafeDiv($this->ftell() - $info['avdataoffset'], $info['avdataend'] - $info['avdataoffset']);
								$this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.');
								foreach ($Distribution as $key1 => $value1) {
									foreach ($value1 as $key2 => $value2) {
										$Distribution[$key1][$key2] = $pct_data_scanned ? round($value2 / $pct_data_scanned) : 1;
									}
								}
								break;
							}
							continue;
						}
					}
					unset($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) {
			$this->error('Corrupt file - more than one MPEG version detected');
		}
		if (count($Distribution['layer']) > 1) {
			$this->error('Corrupt file - more than one MPEG layer detected');
		}
		if (count($Distribution['frequency']) > 1) {
			$this->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) {
			$this->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;
	}

/**
	 * @param int  $avdataoffset
	 * @param bool $BitrateHistogram
	 *
	 * @return bool
	 */
	public function getOnlyMPEGaudioInfo($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) {
			$this->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;
		$SyncSeekAttempts = 0;
		$SyncSeekAttemptsMax = 1000;
		$FirstFrameThisfileInfo = null;
		while ($SynchSeekOffset < $sync_seek_buffer_size) {
			if ((($avdataoffset + $SynchSeekOffset)  < $info['avdataend']) && !$this->feof()) {

if ($SynchSeekOffset > $sync_seek_buffer_size) {
					// if a synch's not found within the first 128k bytes, then give up
					$this->error('Could not find valid MPEG audio synch within the first '.round($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;
				}
			}

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

if (($header[$SynchSeekOffset] == "\xFF") && ($header[($SynchSeekOffset + 1)] > "\xE0")) { // possible synch detected
				if (++$SyncSeekAttempts >= $SyncSeekAttemptsMax) {
					// https://github.com/JamesHeinrich/getID3/issues/286
					// corrupt files claiming to be MP3, with a large number of 0xFF bytes near the beginning, can cause this loop to take a very long time
					// should have escape condition to avoid spending too much time scanning a corrupt file
					// if a synch's not found within the first 128k bytes, then give up
					$this->error('Could not find valid MPEG audio synch after scanning '.$SyncSeekAttempts.' candidate offsets');
					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;
				}
				$FirstFrameAVDataOffset = null;
				if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
					$FirstFrameThisfileInfo = $info;
					$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
					if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
						// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
						// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
						unset($FirstFrameThisfileInfo);
					}
				}

$dummy = $info; // only overwrite real data if valid header found
				if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
					$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) && 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, $dummy, true, true)) {
								$info = $dummy;
								$info['avdataoffset'] = $GarbageOffsetEnd;
								$this->warning('apparently-valid VBR header not used because could not find '.$this->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 {
								$this->warning('using data from VBR header even though could not find '.$this->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) {
								$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
							} elseif ($info['mpeg']['audio']['layer'] == 2) {
								$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
							} elseif ($info['mpeg']['audio']['layer'] == 1) {
								$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
							}
						} elseif ($info['mpeg']['audio']['layer'] == 1) {
							$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
						} else {
							$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>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;
							$scan_start_offset = array();
							if ($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, $dummy, false, false, $FastMode)) {
											$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
											if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
												$scan_start_offset[$current_segment] += $j;
												break;
											}
										}
									}
								}
							}
							$synchstartoffset = $scan_start_offset[$current_segment];
							while (($synchstartoffset < $info['avdataend']) && $this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $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)) {
									$this_pct_scanned = getid3_lib::SafeDiv($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) {
							$this->warning('too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% 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) {
							$this->warning('Found '.$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) {
							$this->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'])) {

$this->error('could not find valid MPEG synch before end of file');
					if (isset($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']        = $info['mpeg']['audio']['channels'];
		if ($info['audio']['channels'] < 1) {
			$this->error('Corrupt MP3 file: no channels');
			return false;
		}
		$info['audio']['channelmode']     = $info['mpeg']['audio']['channelmode'];
		$info['audio']['sample_rate']     = $info['mpeg']['audio']['sample_rate'];
		return true;
	}

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

/**
	 * @return array
	 */
	public static function MPEGaudioLayerArray() {
		static $MPEGaudioLayer = array(false, 3, 2, 1);
		return $MPEGaudioLayer;
	}

/**
	 * @return array
	 */
	public static function MPEGaudioBitrateArray() {
		static $MPEGaudioBitrate;
		if (empty($MPEGaudioBitrate)) {
			$MPEGaudioBitrate = array (
				'1' => array(
					1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
					2 => array('free', 32000, 48000, 56000,  64000,  80000,  96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
					3 => array('free', 32000, 40000, 48000,  56000,  64000,  80000,  96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
				),
				'2' => array(
					1 => array('free', 32000, 48000, 56000,  64000,  80000,  96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
					2 => array('free',  8000, 16000, 24000,  32000,  40000,  48000,  56000,  64000,  80000,  96000, 112000, 128000, 144000, 160000),
				),
			);
			$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
			$MPEGaudioBitrate['2.5']  = $MPEGaudioBitrate['2'];
		}
		return $MPEGaudioBitrate;
	}

/**
	 * @return array
	 */
	public static function MPEGaudioFrequencyArray() {
		static $MPEGaudioFrequency;
		if (empty($MPEGaudioFrequency)) {
			$MPEGaudioFrequency = array (
				'1'   => array(44100, 48000, 32000),
				'2'   => array(22050, 24000, 16000),
				'2.5' => array(11025, 12000,  8000)
			);
		}
		return $MPEGaudioFrequency;
	}

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

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

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

/**
	 * @param string $head4
	 * @param bool   $allowBitrate15
	 *
	 * @return bool
	 */
	public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
		return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
	}

/**
	 * @param array $rawarray
	 * @param bool  $echoerrors
	 * @param bool  $allowBitrate15
	 *
	 * @return bool
	 */
	public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
		if (!isset($rawarray['synch']) || ($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;
	}

/**
	 * @param string $Header4Bytes
	 *
	 * @return array|false
	 */
	public static function MPEGaudioHeaderDecode($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 = array();
		$MPEGrawHeader['synch']         = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 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;
	}

/**
	 * @param int|string $bitrate
	 * @param string     $version
	 * @param string     $layer
	 * @param bool       $padding
	 * @param int        $samplerate
	 *
	 * @return int|false
	 */
	public static function MPEGaudioFrameLength(&$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];
	}

/**
	 * @param float|int $bit_rate
	 *
	 * @return int|float|string
	 */
	public static function ClosestStandardMP3Bitrate($bit_rate) {
		static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
		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($bit_rate, 2 - strlen($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];
	}

/**
	 * @param string $version
	 * @param string $channelmode
	 *
	 * @return int
	 */
	public static function XingVBRidOffset($version, $channelmode) {
		static $XingVBRidOffsetCache = array();
		if (empty($XingVBRidOffsetCache)) {
			$XingVBRidOffsetCache = 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 $XingVBRidOffsetCache[$version][$channelmode];
	}

/**
	 * @param int $VBRmethodID
	 *
	 * @return string
	 */
	public static function LAMEvbrMethodLookup($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] : '');
	}

/**
	 * @param int $StereoModeID
	 *
	 * @return string
	 */
	public static function LAMEmiscStereoModeLookup($StereoModeID) {
		static $LAMEmiscStereoModeLookup = array(
			0 => 'mono',
			1 => 'stereo',
			2 => 'dual mono',
			3 => 'joint stereo',
			4 => 'forced stereo',
			5 => 'auto',
			6 => 'intensity stereo',
			7 => 'other'
		);
		return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
	}

/**
	 * @param int $SourceSampleFrequencyID
	 *
	 * @return string
	 */
	public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
		static $LAMEmiscSourceSampleFrequencyLookup = array(
			0 => '<= 32 kHz',
			1 => '44.1 kHz',
			2 => '48 kHz',
			3 => '> 48kHz'
		);
		return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
	}

/**
	 * @param int $SurroundInfoID
	 *
	 * @return string
	 */
	public static function LAMEsurroundInfoLookup($SurroundInfoID) {
		static $LAMEsurroundInfoLookup = array(
			0 => 'no surround info',
			1 => 'DPL encoding',
			2 => 'DPL2 encoding',
			3 => 'Ambisonic encoding'
		);
		return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
	}

/**
	 * @param array $LAMEtag
	 *
	 * @return string
	 */
	public static function LAMEpresetUsedLookup($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');
	}

}

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February 9, 2026

Forgotten Infant Burial Grounds in Ireland Revealed Through Folklore and Archaeology

A new archaeological study is bringing long-overlooked burial sites in Ireland back into public awareness. Research led by Marion Dowd, an archaeologist at Atlantic Technological University, has identified dozens of ...

Mukesh Gusaiana

February 9, 2026

Ireland’s Forgotten Infant Burial Grounds Are Being Found Again — With Help From Old Stories

For centuries, a silent, sacred geography lay hidden in plain sight. Scattered across the Irish landscape, in lonely fields and near forgotten wells, are the lost graves of the smallest ...

Mukesh Gusaiana

February 7, 2026

Dwarka – The Submerged City of Krishna, Untold mysteries about the ancient city which exists underwater

What if a city of myth, described in sacred texts for millennia, suddenly emerged from the fog of legend? Not as a metaphor, but as stones and foundations on the ...

Mukesh Gusaiana

February 6, 2026

Did Scientists Really Find Radiation at Mohenjo-Daro? What the Evidence Shows

For decades, a tantalizing and unsettling theory has circulated about the fate of the ancient Indus Valley city of Mohenjo-daro. The story goes that this advanced metropolis, one of the ...

Mukesh Gusaiana

February 5, 2026

Father of Architecture: Ancient Roman Basilica Linked to Vitruvius Discovered in Italy’s Fano

Archaeologists in Italy have uncovered what may be the first physical architectural evidence directly connected to Vitruvius, the legendary Roman engineer widely regarded as the “Father of Architecture.” The monumental ...

Mukesh Gusaiana

February 4, 2026

2,000-Year-Old Roman Basilica Linked to Vitruvius Discovered in Italy

Roman Basilica Linked to Vitruvius Discovered: Archaeologists in Italy have made a landmark discovery that could reshape the understanding of ancient Roman architecture. A 2,000-year-old basilica believed to be directly ...

Mukesh Gusaiana

February 4, 2026

Viking or Saxon Mass Burial Pit Discovered Near Cambridge, Reveals Brutal 9th-Century History

A chilling archaeological discovery near Cambridge has uncovered a burial pit containing the remains of at least ten individuals, believed to date back to the ninth century AD. The find, ...

Mukesh Gusaiana

February 4, 2026

An ancient temple has been discovered buried under sand in Nellore, India, and will now be restored

Ancient temple in Nellore, India: For over 150 years, the Penna River held a sacred secret. After catastrophic floods in the 1850s shifted its course, it quietly buried a temple ...

Mukesh Gusaiana

February 3, 2026

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The Lost ERA is a dedicated archaeology & history news site offering well-researched insights, discoveries, and educational articles on ancient civilizations, cultural heritage, and archaeological science. We strive to bring accurate historical reporting and engaging content to global readers.

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