<?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') {

$encoder_options = strtoupper($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;

}

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

}

}