Edit File by line

* @param int $fscod

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* @return int|string|false

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public static function sampleRateCodeLookup($fscod) {

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static $sampleRateCodeLookup = array(

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0 => 48000,

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1 => 44100,

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2 => 32000,

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3 => 'reserved' // If the reserved code is indicated, the decoder should not attempt to decode audio and should mute.

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);

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return (isset($sampleRateCodeLookup[$fscod]) ? $sampleRateCodeLookup[$fscod] : false);

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}

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/**

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* @param int $fscod2

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* @return int|string|false

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public static function sampleRateCodeLookup2($fscod2) {

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static $sampleRateCodeLookup2 = array(

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0 => 24000,

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1 => 22050,

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2 => 16000,

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3 => 'reserved' // If the reserved code is indicated, the decoder should not attempt to decode audio and should mute.

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);

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return (isset($sampleRateCodeLookup2[$fscod2]) ? $sampleRateCodeLookup2[$fscod2] : false);

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}

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/**

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* @param int $bsmod

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* @param int $acmod

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* @return string|false

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public static function serviceTypeLookup($bsmod, $acmod) {

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static $serviceTypeLookup = array();

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if (empty($serviceTypeLookup)) {

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for ($i = 0; $i <= 7; $i++) {

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$serviceTypeLookup[0][$i] = 'main audio service: complete main (CM)';

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$serviceTypeLookup[1][$i] = 'main audio service: music and effects (ME)';

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$serviceTypeLookup[2][$i] = 'associated service: visually impaired (VI)';

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$serviceTypeLookup[3][$i] = 'associated service: hearing impaired (HI)';

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$serviceTypeLookup[4][$i] = 'associated service: dialogue (D)';

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$serviceTypeLookup[5][$i] = 'associated service: commentary (C)';

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$serviceTypeLookup[6][$i] = 'associated service: emergency (E)';

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}

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$serviceTypeLookup[7][1] = 'associated service: voice over (VO)';

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for ($i = 2; $i <= 7; $i++) {

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$serviceTypeLookup[7][$i] = 'main audio service: karaoke';

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}

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}

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return (isset($serviceTypeLookup[$bsmod][$acmod]) ? $serviceTypeLookup[$bsmod][$acmod] : false);

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}

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/**

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* @param int $acmod

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* @return array|false

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public static function audioCodingModeLookup($acmod) {

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// array(channel configuration, # channels (not incl LFE), channel order)

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static $audioCodingModeLookup = array (

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0 => array('channel_config'=>'1+1', 'num_channels'=>2, 'channel_order'=>'Ch1,Ch2'),

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1 => array('channel_config'=>'1/0', 'num_channels'=>1, 'channel_order'=>'C'),

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2 => array('channel_config'=>'2/0', 'num_channels'=>2, 'channel_order'=>'L,R'),

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3 => array('channel_config'=>'3/0', 'num_channels'=>3, 'channel_order'=>'L,C,R'),

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4 => array('channel_config'=>'2/1', 'num_channels'=>3, 'channel_order'=>'L,R,S'),

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5 => array('channel_config'=>'3/1', 'num_channels'=>4, 'channel_order'=>'L,C,R,S'),

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6 => array('channel_config'=>'2/2', 'num_channels'=>4, 'channel_order'=>'L,R,SL,SR'),

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7 => array('channel_config'=>'3/2', 'num_channels'=>5, 'channel_order'=>'L,C,R,SL,SR'),

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);

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return (isset($audioCodingModeLookup[$acmod]) ? $audioCodingModeLookup[$acmod] : false);

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}

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/**

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* @param int $cmixlev

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* @return int|float|string|false

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public static function centerMixLevelLookup($cmixlev) {

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static $centerMixLevelLookup;

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if (empty($centerMixLevelLookup)) {

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$centerMixLevelLookup = array(

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0 => pow(2, -3.0 / 6), // 0.707 (-3.0 dB)

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1 => pow(2, -4.5 / 6), // 0.595 (-4.5 dB)

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2 => pow(2, -6.0 / 6), // 0.500 (-6.0 dB)

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3 => 'reserved'

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);

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}

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return (isset($centerMixLevelLookup[$cmixlev]) ? $centerMixLevelLookup[$cmixlev] : false);

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}

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/**

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* @param int $surmixlev

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* @return int|float|string|false

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public static function surroundMixLevelLookup($surmixlev) {

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static $surroundMixLevelLookup;

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if (empty($surroundMixLevelLookup)) {

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$surroundMixLevelLookup = array(

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0 => pow(2, -3.0 / 6),

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1 => pow(2, -6.0 / 6),

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2 => 0,

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3 => 'reserved'

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);

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}

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return (isset($surroundMixLevelLookup[$surmixlev]) ? $surroundMixLevelLookup[$surmixlev] : false);

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}

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/**

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* @param int $dsurmod

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* @return string|false

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public static function dolbySurroundModeLookup($dsurmod) {

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static $dolbySurroundModeLookup = array(

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0 => 'not indicated',

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1 => 'Not Dolby Surround encoded',

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2 => 'Dolby Surround encoded',

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3 => 'reserved'

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);

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return (isset($dolbySurroundModeLookup[$dsurmod]) ? $dolbySurroundModeLookup[$dsurmod] : false);

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}

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/**

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* @param int $acmod

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* @param bool $lfeon

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* @return array

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public static function channelsEnabledLookup($acmod, $lfeon) {

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$lookup = array(

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'ch1'=>($acmod == 0),

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'ch2'=>($acmod == 0),

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'left'=>($acmod > 1),

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'right'=>($acmod > 1),

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'center'=>(bool) ($acmod & 0x01),

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'surround_mono'=>false,

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'surround_left'=>false,

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'surround_right'=>false,

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'lfe'=>$lfeon);

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switch ($acmod) {

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case 4:

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case 5:

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$lookup['surround_mono'] = true;

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break;

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case 6:

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case 7:

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$lookup['surround_left'] = true;

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$lookup['surround_right'] = true;

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break;

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}

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return $lookup;

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}

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/**

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* @param int $compre

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* @return float|int

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public static function heavyCompression($compre) {

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// The first four bits indicate gain changes in 6.02dB increments which can be

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// implemented with an arithmetic shift operation. The following four bits

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// indicate linear gain changes, and require a 5-bit multiply.

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// We will represent the two 4-bit fields of compr as follows:

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// X0 X1 X2 X3 . Y4 Y5 Y6 Y7

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// The meaning of the X values is most simply described by considering X to represent a 4-bit

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// signed integer with values from -8 to +7. The gain indicated by X is then (X + 1) * 6.02 dB. The

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// following table shows this in detail.

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// Meaning of 4 msb of compr

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// 7 +48.16 dB

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// 6 +42.14 dB

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// 5 +36.12 dB

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// 4 +30.10 dB

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// 3 +24.08 dB

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// 2 +18.06 dB

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// 1 +12.04 dB

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// 0 +6.02 dB

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// -1 0 dB

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// -2 -6.02 dB

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// -3 -12.04 dB

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// -4 -18.06 dB

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// -5 -24.08 dB

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// -6 -30.10 dB

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// -7 -36.12 dB

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// -8 -42.14 dB

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$fourbit = str_pad(decbin(($compre & 0xF0) >> 4), 4, '0', STR_PAD_LEFT);

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if ($fourbit[0] == '1') {

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$log_gain = -8 + bindec(substr($fourbit, 1));

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} else {

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$log_gain = bindec(substr($fourbit, 1));

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}

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$log_gain = ($log_gain + 1) * getid3_lib::RGADamplitude2dB(2);

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// The value of Y is a linear representation of a gain change of up to -6 dB. Y is considered to

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// be an unsigned fractional integer, with a leading value of 1, or: 0.1 Y4 Y5 Y6 Y7 (base 2). Y can

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// represent values between 0.111112 (or 31/32) and 0.100002 (or 1/2). Thus, Y can represent gain

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// changes from -0.28 dB to -6.02 dB.

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$lin_gain = (16 + ($compre & 0x0F)) / 32;

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// The combination of X and Y values allows compr to indicate gain changes from

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// 48.16 - 0.28 = +47.89 dB, to

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// -42.14 - 6.02 = -48.16 dB.

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return $log_gain - $lin_gain;

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}

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/**

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* @param int $roomtyp

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* @return string|false

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public static function roomTypeLookup($roomtyp) {

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static $roomTypeLookup = array(

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0 => 'not indicated',

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1 => 'large room, X curve monitor',

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2 => 'small room, flat monitor',

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3 => 'reserved'

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);

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return (isset($roomTypeLookup[$roomtyp]) ? $roomTypeLookup[$roomtyp] : false);

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}

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/**

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* @param int $frmsizecod

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* @param int $fscod

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* @return int|false

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public static function frameSizeLookup($frmsizecod, $fscod) {

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// LSB is whether padding is used or not

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$padding = (bool) ($frmsizecod & 0x01);

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$framesizeid = ($frmsizecod & 0x3E) >> 1;

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static $frameSizeLookup = array();

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if (empty($frameSizeLookup)) {

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$frameSizeLookup = array (

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0 => array( 128, 138, 192), // 32 kbps

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1 => array( 160, 174, 240), // 40 kbps

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2 => array( 192, 208, 288), // 48 kbps

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3 => array( 224, 242, 336), // 56 kbps

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4 => array( 256, 278, 384), // 64 kbps

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5 => array( 320, 348, 480), // 80 kbps

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6 => array( 384, 416, 576), // 96 kbps

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7 => array( 448, 486, 672), // 112 kbps

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8 => array( 512, 556, 768), // 128 kbps

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9 => array( 640, 696, 960), // 160 kbps

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10 => array( 768, 834, 1152), // 192 kbps

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11 => array( 896, 974, 1344), // 224 kbps

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12 => array(1024, 1114, 1536), // 256 kbps

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13 => array(1280, 1392, 1920), // 320 kbps

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14 => array(1536, 1670, 2304), // 384 kbps

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15 => array(1792, 1950, 2688), // 448 kbps

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16 => array(2048, 2228, 3072), // 512 kbps

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17 => array(2304, 2506, 3456), // 576 kbps

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18 => array(2560, 2786, 3840) // 640 kbps

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);

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}

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$paddingBytes = 0;

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if (($fscod == 1) && $padding) {

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// frame lengths are padded by 1 word (16 bits) at 44100

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// (fscode==1) means 44100Hz (see sampleRateCodeLookup)

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$paddingBytes = 2;

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}

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return (isset($frameSizeLookup[$framesizeid][$fscod]) ? $frameSizeLookup[$framesizeid][$fscod] + $paddingBytes : false);

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}

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[771] Fix | Delete

/**

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* @param int $frmsizecod

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* @return int|false

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public static function bitrateLookup($frmsizecod) {

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// LSB is whether padding is used or not

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$padding = (bool) ($frmsizecod & 0x01);

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$framesizeid = ($frmsizecod & 0x3E) >> 1;

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[781] Fix | Delete

static $bitrateLookup = array(

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0 => 32000,

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1 => 40000,

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2 => 48000,

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3 => 56000,

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4 => 64000,

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5 => 80000,

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6 => 96000,

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7 => 112000,

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8 => 128000,

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9 => 160000,

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10 => 192000,

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11 => 224000,

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12 => 256000,

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13 => 320000,

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14 => 384000,

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15 => 448000,

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16 => 512000,

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17 => 576000,

[800] Fix | Delete

18 => 640000,

[801] Fix | Delete

);

[802] Fix | Delete

return (isset($bitrateLookup[$framesizeid]) ? $bitrateLookup[$framesizeid] : false);

[803] Fix | Delete

}

[804] Fix | Delete

[805] Fix | Delete

/**

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* @param int $numblkscod

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[808] Fix | Delete

* @return int|false

[809] Fix | Delete

[810] Fix | Delete

public static function blocksPerSyncFrame($numblkscod) {

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static $blocksPerSyncFrameLookup = array(

[812] Fix | Delete

0 => 1,

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1 => 2,

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2 => 3,

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3 => 6,

[816] Fix | Delete

);

[817] Fix | Delete

return (isset($blocksPerSyncFrameLookup[$numblkscod]) ? $blocksPerSyncFrameLookup[$numblkscod] : false);

[818] Fix | Delete

}

[819] Fix | Delete

[820] Fix | Delete

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}

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