--- /dev/null
+<?php
+
+if (!function_exists('PrintHexBytes')) {
+ function PrintHexBytes($string) {
+ $returnstring = '';
+ for ($i = 0; $i < strlen($string); $i++) {
+ $returnstring .= str_pad(dechex(ord(substr($string, $i, 1))), 2, '0', STR_PAD_LEFT).' ';
+ }
+ return $returnstring;
+ }
+}
+
+if (!function_exists('PrintTextBytes')) {
+ function PrintTextBytes($string) {
+ $returnstring = '';
+ for ($i = 0; $i < strlen($string); $i++) {
+ if (ord(substr($string, $i, 1)) <= 31) {
+ $returnstring .= ' ';
+ } else {
+ $returnstring .= ' '.substr($string, $i, 1).' ';
+ }
+ }
+ return $returnstring;
+ }
+}
+
+if (!function_exists('table_var_dump')) {
+ function table_var_dump($variable) {
+ $returnstring = '';
+ switch (gettype($variable)) {
+ case 'array':
+ $returnstring .= '<table border="1" cellspacing="0" cellpadding="2">';
+ foreach ($variable as $key => $value) {
+ $returnstring .= '<tr><td valign="top"><b>'.str_replace(chr(0), ' ', $key).'</b></td>';
+ $returnstring .= '<td valign="top">'.gettype($value);
+ if (is_array($value)) {
+ $returnstring .= ' ('.count($value).')';
+ } elseif (is_string($value)) {
+ $returnstring .= ' ('.strlen($value).')';
+ }
+ if (($key == 'data') && isset($variable['image_mime']) && isset($variable['dataoffset'])) {
+ require_once(GETID3_INCLUDEPATH.'getid3.getimagesize.php');
+ $imageinfo = array();
+ if ($imagechunkcheck = GetDataImageSize($value, $imageinfo)) {
+ $DumpedImageSRC = (!empty($_REQUEST['filename']) ? $_REQUEST['filename'] : '.getid3').'.'.$variable['dataoffset'].'.'.ImageTypesLookup($imagechunkcheck[2]);
+ if ($tempimagefile = fopen($DumpedImageSRC, 'wb')) {
+ fwrite($tempimagefile, $value);
+ fclose($tempimagefile);
+ }
+ $returnstring .= '</td><td><img src="'.$DumpedImageSRC.'" width="'.$imagechunkcheck[0].'" height="'.$imagechunkcheck[1].'"></td></tr>';
+ } else {
+ $returnstring .= '</td><td><i>invalid image data</i></td></tr>';
+ }
+ } else {
+ $returnstring .= '</td><td>'.table_var_dump($value).'</td></tr>';
+ }
+ }
+ $returnstring .= '</table>';
+ break;
+
+ case 'boolean':
+ $returnstring .= ($variable ? 'TRUE' : 'FALSE');
+ break;
+
+ case 'integer':
+ case 'double':
+ case 'float':
+ $returnstring .= $variable;
+ break;
+
+ case 'object':
+ case 'null':
+ $returnstring .= string_var_dump($variable);
+ break;
+
+ case 'string':
+ $variable = str_replace(chr(0), ' ', $variable);
+ $varlen = strlen($variable);
+ for ($i = 0; $i < $varlen; $i++) {
+ if (preg_match('#['.chr(0x0A).chr(0x0D).' -;0-9A-Za-z]#', $variable{$i})) {
+ $returnstring .= $variable{$i};
+ } else {
+ $returnstring .= '&#'.str_pad(ord($variable{$i}), 3, '0', STR_PAD_LEFT).';';
+ }
+ }
+ $returnstring = nl2br($returnstring);
+ break;
+
+ default:
+ require_once(GETID3_INCLUDEPATH.'getid3.getimagesize.php');
+ $imageinfo = array();
+ if (($imagechunkcheck = GetDataImageSize(substr($variable, 0, 32768), $imageinfo)) && ($imagechunkcheck[2] >= 1) && ($imagechunkcheck[2] <= 3)) {
+ $returnstring .= '<table border="1" cellspacing="0" cellpadding="2">';
+ $returnstring .= '<tr><td><b>type</b></td><td>'.ImageTypesLookup($imagechunkcheck[2]).'</td></tr>';
+ $returnstring .= '<tr><td><b>width</b></td><td>'.number_format($imagechunkcheck[0]).' px</td></tr>';
+ $returnstring .= '<tr><td><b>height</b></td><td>'.number_format($imagechunkcheck[1]).' px</td></tr>';
+ $returnstring .= '<tr><td><b>size</b></td><td>'.number_format(strlen($variable)).' bytes</td></tr></table>';
+ } else {
+ $returnstring .= nl2br(htmlspecialchars(str_replace(chr(0), ' ', $variable)));
+ }
+ break;
+ }
+ return $returnstring;
+ }
+}
+
+if (!function_exists('string_var_dump')) {
+ function string_var_dump($variable) {
+ if (version_compare(PHP_VERSION, '4.3.0', '>=')) {
+ return print_r($variable, true);
+ }
+ ob_start();
+ var_dump($variable);
+ $dumpedvariable = ob_get_contents();
+ ob_end_clean();
+ return $dumpedvariable;
+ }
+}
+
+if (!function_exists('fileextension')) {
+ function fileextension($filename, $numextensions=1) {
+ if (strstr($filename, '.')) {
+ $reversedfilename = strrev($filename);
+ $offset = 0;
+ for ($i = 0; $i < $numextensions; $i++) {
+ $offset = strpos($reversedfilename, '.', $offset + 1);
+ if ($offset === false) {
+ return '';
+ }
+ }
+ return strrev(substr($reversedfilename, 0, $offset));
+ }
+ return '';
+ }
+}
+
+if (!function_exists('RemoveAccents')) {
+ function RemoveAccents($string) {
+ // return strtr($string, '\8a\8c\8e\9a\9c\9e\9f¥µÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ', 'SOZsozYYuAAAAAAACEEEEIIIIDNOOOOOOUUUUYsaaaaaaaceeeeiiiionoooooouuuuyy');
+ // Revised version by marksteward@hotmail.com
+ return strtr(strtr($string, '\8a\8e\9a\9e\9fÀÁÂÃÄÅÇÈÉÊËÌÍÎÏÑÒÓÔÕÖØÙÚÛÜÝàáâãäåçèéêëìíîïñòóôõöøùúûüýÿ', 'SZszYAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy'), array('Þ' => 'TH', 'þ' => 'th', 'Ð' => 'DH', 'ð' => 'dh', 'ß' => 'ss', '\8c' => 'OE', '\9c' => 'oe', 'Æ' => 'AE', 'æ' => 'ae', 'µ' => 'u'));
+ }
+}
+
+if (!function_exists('MoreNaturalSort')) {
+ function MoreNaturalSort($ar1, $ar2) {
+ if ($ar1 === $ar2) {
+ return 0;
+ }
+ $len1 = strlen($ar1);
+ $len2 = strlen($ar2);
+ $shortest = min($len1, $len2);
+ if (substr($ar1, 0, $shortest) === substr($ar2, 0, $shortest)) {
+ // the shorter argument is the beginning of the longer one, like "str" and "string"
+ if ($len1 < $len2) {
+ return -1;
+ } elseif ($len1 > $len2) {
+ return 1;
+ }
+ return 0;
+ }
+ $ar1 = RemoveAccents(strtolower(trim($ar1)));
+ $ar2 = RemoveAccents(strtolower(trim($ar2)));
+ $translatearray = array('\''=>'', '"'=>'', '_'=>' ', '('=>'', ')'=>'', '-'=>' ', ' '=>' ', '.'=>'', ','=>'');
+ foreach ($translatearray as $key => $val) {
+ $ar1 = str_replace($key, $val, $ar1);
+ $ar2 = str_replace($key, $val, $ar2);
+ }
+
+ if ($ar1 < $ar2) {
+ return -1;
+ } elseif ($ar1 > $ar2) {
+ return 1;
+ }
+ return 0;
+ }
+}
+
+if (!function_exists('trunc')) {
+ function trunc($floatnumber) {
+ // truncates a floating-point number at the decimal point
+ // returns int (if possible, otherwise float)
+ if ($floatnumber >= 1) {
+ $truncatednumber = floor($floatnumber);
+ } elseif ($floatnumber <= -1) {
+ $truncatednumber = ceil($floatnumber);
+ } else {
+ $truncatednumber = 0;
+ }
+ if ($truncatednumber <= pow(2, 30)) {
+ $truncatednumber = (int) $truncatednumber;
+ }
+ return $truncatednumber;
+ }
+}
+
+if (!function_exists('CastAsInt')) {
+ function CastAsInt($floatnum) {
+ // convert to float if not already
+ $floatnum = (float) $floatnum;
+
+ // convert a float to type int, only if possible
+ if (trunc($floatnum) == $floatnum) {
+ // it's not floating point
+ if ($floatnum <= pow(2, 30)) {
+ // it's within int range
+ $floatnum = (int) $floatnum;
+ }
+ }
+ return $floatnum;
+ }
+}
+
+if (!function_exists('getmicrotime')) {
+ function getmicrotime() {
+ list($usec, $sec) = explode(' ', microtime());
+ return ((float) $usec + (float) $sec);
+ }
+}
+
+if (!function_exists('DecimalBinary2Float')) {
+ function DecimalBinary2Float($binarynumerator) {
+ $numerator = Bin2Dec($binarynumerator);
+ $denominator = Bin2Dec(str_repeat('1', strlen($binarynumerator)));
+ return ($numerator / $denominator);
+ }
+}
+
+if (!function_exists('NormalizeBinaryPoint')) {
+ function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) {
+ // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
+ if (strpos($binarypointnumber, '.') === false) {
+ $binarypointnumber = '0.'.$binarypointnumber;
+ } elseif ($binarypointnumber{0} == '.') {
+ $binarypointnumber = '0'.$binarypointnumber;
+ }
+ $exponent = 0;
+ while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) {
+ if (substr($binarypointnumber, 1, 1) == '.') {
+ $exponent--;
+ $binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3);
+ } else {
+ $pointpos = strpos($binarypointnumber, '.');
+ $exponent += ($pointpos - 1);
+ $binarypointnumber = str_replace('.', '', $binarypointnumber);
+ $binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1);
+ }
+ }
+ $binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT);
+ return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent);
+ }
+}
+
+if (!function_exists('Float2BinaryDecimal')) {
+ function Float2BinaryDecimal($floatvalue) {
+ // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
+ $maxbits = 128; // to how many bits of precision should the calculations be taken?
+ $intpart = trunc($floatvalue);
+ $floatpart = abs($floatvalue - $intpart);
+ $pointbitstring = '';
+ while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
+ $floatpart *= 2;
+ $pointbitstring .= (string) trunc($floatpart);
+ $floatpart -= trunc($floatpart);
+ }
+ $binarypointnumber = decbin($intpart).'.'.$pointbitstring;
+ return $binarypointnumber;
+ }
+}
+
+if (!function_exists('Float2String')) {
+ function Float2String($floatvalue, $bits) {
+ // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee-expl.html
+ switch ($bits) {
+ case 32:
+ $exponentbits = 8;
+ $fractionbits = 23;
+ break;
+
+ case 64:
+ $exponentbits = 11;
+ $fractionbits = 52;
+ break;
+
+ default:
+ return false;
+ break;
+ }
+ if ($floatvalue >= 0) {
+ $signbit = '0';
+ } else {
+ $signbit = '1';
+ }
+ $normalizedbinary = NormalizeBinaryPoint(Float2BinaryDecimal($floatvalue), $fractionbits);
+ $biasedexponent = pow(2, $exponentbits - 1) - 1 + $normalizedbinary['exponent']; // (127 or 1023) +/- exponent
+ $exponentbitstring = str_pad(decbin($biasedexponent), $exponentbits, '0', STR_PAD_LEFT);
+ $fractionbitstring = str_pad(substr($normalizedbinary['normalized'], 2), $fractionbits, '0', STR_PAD_RIGHT);
+
+ return BigEndian2String(Bin2Dec($signbit.$exponentbitstring.$fractionbitstring), $bits % 8, false);
+ }
+}
+
+if (!function_exists('LittleEndian2Float')) {
+ function LittleEndian2Float($byteword) {
+ return BigEndian2Float(strrev($byteword));
+ }
+}
+
+if (!function_exists('BigEndian2Float')) {
+ function BigEndian2Float($byteword) {
+ // ANSI/IEEE Standard 754-1985, Standard for Binary Floating Point Arithmetic
+ // http://www.psc.edu/general/software/packages/ieee/ieee.html
+ // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee.html
+
+ $bitword = BigEndian2Bin($byteword);
+ $signbit = $bitword{0};
+
+ switch (strlen($byteword) * 8) {
+ case 32:
+ $exponentbits = 8;
+ $fractionbits = 23;
+ break;
+
+ case 64:
+ $exponentbits = 11;
+ $fractionbits = 52;
+ break;
+
+ case 80:
+ $exponentbits = 16;
+ $fractionbits = 64;
+ break;
+
+ default:
+ return false;
+ break;
+ }
+ $exponentstring = substr($bitword, 1, $exponentbits - 1);
+ $fractionstring = substr($bitword, $exponentbits, $fractionbits);
+ $exponent = Bin2Dec($exponentstring);
+ $fraction = Bin2Dec($fractionstring);
+
+ if (($exponentbits == 16) && ($fractionbits == 64)) {
+ // 80-bit
+ // As used in Apple AIFF for sample_rate
+ // A bit of a hack, but it works ;)
+ return pow(2, ($exponent - 16382)) * DecimalBinary2Float($fractionstring);
+ }
+
+
+ if (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction != 0)) {
+ // Not a Number
+ $floatvalue = false;
+ } elseif (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction == 0)) {
+ if ($signbit == '1') {
+ $floatvalue = '-infinity';
+ } else {
+ $floatvalue = '+infinity';
+ }
+ } elseif (($exponent == 0) && ($fraction == 0)) {
+ if ($signbit == '1') {
+ $floatvalue = -0;
+ } else {
+ $floatvalue = 0;
+ }
+ $floatvalue = ($signbit ? 0 : -0);
+ } elseif (($exponent == 0) && ($fraction != 0)) {
+ // These are 'unnormalized' values
+ $floatvalue = pow(2, (-1 * (pow(2, $exponentbits - 1) - 2))) * DecimalBinary2Float($fractionstring);
+ if ($signbit == '1') {
+ $floatvalue *= -1;
+ }
+ } elseif ($exponent != 0) {
+ $floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + DecimalBinary2Float($fractionstring));
+ if ($signbit == '1') {
+ $floatvalue *= -1;
+ }
+ }
+ return (float) $floatvalue;
+ }
+}
+
+if (!function_exists('BigEndian2Int')) {
+ function BigEndian2Int($byteword, $synchsafe=false, $signed=false) {
+ $intvalue = 0;
+ $bytewordlen = strlen($byteword);
+ for ($i = 0; $i < $bytewordlen; $i++) {
+ if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
+ $intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7);
+ } else {
+ $intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
+ }
+ }
+ if ($signed && !$synchsafe) {
+ // synchsafe ints are not allowed to be signed
+ switch ($bytewordlen) {
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ $signmaskbit = 0x80 << (8 * ($bytewordlen - 1));
+ if ($intvalue & $signmaskbit) {
+ $intvalue = 0 - ($intvalue & ($signmaskbit - 1));
+ }
+ break;
+
+ default:
+ die('ERROR: Cannot have signed integers larger than 32-bits in BigEndian2Int()');
+ break;
+ }
+ }
+ return CastAsInt($intvalue);
+ }
+}
+
+if (!function_exists('LittleEndian2Int')) {
+ function LittleEndian2Int($byteword, $signed=false) {
+ return BigEndian2Int(strrev($byteword), false, $signed);
+ }
+}
+
+if (!function_exists('BigEndian2Bin')) {
+ function BigEndian2Bin($byteword) {
+ $binvalue = '';
+ $bytewordlen = strlen($byteword);
+ for ($i = 0; $i < $bytewordlen; $i++) {
+ $binvalue .= str_pad(decbin(ord($byteword{$i})), 8, '0', STR_PAD_LEFT);
+ }
+ return $binvalue;
+ }
+}
+
+if (!function_exists('BigEndian2String')) {
+ function BigEndian2String($number, $minbytes=1, $synchsafe=false, $signed=false) {
+ if ($number < 0) {
+ return false;
+ }
+ $maskbyte = (($synchsafe || $signed) ? 0x7F : 0xFF);
+ $intstring = '';
+ if ($signed) {
+ if ($minbytes > 4) {
+ die('ERROR: Cannot have signed integers larger than 32-bits in BigEndian2String()');
+ }
+ $number = $number & (0x80 << (8 * ($minbytes - 1)));
+ }
+ while ($number != 0) {
+ $quotient = ($number / ($maskbyte + 1));
+ $intstring = chr(ceil(($quotient - floor($quotient)) * $maskbyte)).$intstring;
+ $number = floor($quotient);
+ }
+ return str_pad($intstring, $minbytes, chr(0), STR_PAD_LEFT);
+ }
+}
+
+if (!function_exists('Dec2Bin')) {
+ function Dec2Bin($number) {
+ while ($number >= 256) {
+ $bytes[] = (($number / 256) - (floor($number / 256))) * 256;
+ $number = floor($number / 256);
+ }
+ $bytes[] = $number;
+ $binstring = '';
+ for ($i = 0; $i < count($bytes); $i++) {
+ $binstring = (($i == count($bytes) - 1) ? decbin($bytes[$i]) : str_pad(decbin($bytes[$i]), 8, '0', STR_PAD_LEFT)).$binstring;
+ }
+ return $binstring;
+ }
+}
+
+if (!function_exists('Bin2Dec')) {
+ function Bin2Dec($binstring) {
+ $decvalue = 0;
+ for ($i = 0; $i < strlen($binstring); $i++) {
+ $decvalue += ((int) substr($binstring, strlen($binstring) - $i - 1, 1)) * pow(2, $i);
+ }
+ return CastAsInt($decvalue);
+ }
+}
+
+if (!function_exists('Bin2String')) {
+ function Bin2String($binstring) {
+ // return 'hi' for input of '0110100001101001'
+ $string = '';
+ $binstringreversed = strrev($binstring);
+ for ($i = 0; $i < strlen($binstringreversed); $i += 8) {
+ $string = chr(Bin2Dec(strrev(substr($binstringreversed, $i, 8)))).$string;
+ }
+ return $string;
+ }
+}
+
+if (!function_exists('LittleEndian2String')) {
+ function LittleEndian2String($number, $minbytes=1, $synchsafe=false) {
+ $intstring = '';
+ while ($number > 0) {
+ if ($synchsafe) {
+ $intstring = $intstring.chr($number & 127);
+ $number >>= 7;
+ } else {
+ $intstring = $intstring.chr($number & 255);
+ $number >>= 8;
+ }
+ }
+ return str_pad($intstring, $minbytes, chr(0), STR_PAD_RIGHT);
+ }
+}
+
+if (!function_exists('Bool2IntString')) {
+ function Bool2IntString($intvalue) {
+ return ($intvalue ? '1' : '0');
+ }
+}
+
+if (!function_exists('IntString2Bool')) {
+ function IntString2Bool($char) {
+ if ($char == '1') {
+ return true;
+ } elseif ($char == '0') {
+ return false;
+ }
+ return null;
+ }
+}
+
+if (!function_exists('InverseBoolean')) {
+ function InverseBoolean($value) {
+ return ($value ? false : true);
+ }
+}
+
+if (!function_exists('DeUnSynchronise')) {
+ function DeUnSynchronise($data) {
+ return str_replace(chr(0xFF).chr(0x00), chr(0xFF), $data);
+ }
+}
+
+if (!function_exists('Unsynchronise')) {
+ function Unsynchronise($data) {
+ // Whenever a false synchronisation is found within the tag, one zeroed
+ // byte is inserted after the first false synchronisation byte. The
+ // format of a correct sync that should be altered by ID3 encoders is as
+ // follows:
+ // %11111111 111xxxxx
+ // And should be replaced with:
+ // %11111111 00000000 111xxxxx
+ // This has the side effect that all $FF 00 combinations have to be
+ // altered, so they won't be affected by the decoding process. Therefore
+ // all the $FF 00 combinations have to be replaced with the $FF 00 00
+ // combination during the unsynchronisation.
+
+ $data = str_replace(chr(0xFF).chr(0x00), chr(0xFF).chr(0x00).chr(0x00), $data);
+ $unsyncheddata = '';
+ for ($i = 0; $i < strlen($data); $i++) {
+ $thischar = $data{$i};
+ $unsyncheddata .= $thischar;
+ if ($thischar == chr(255)) {
+ $nextchar = ord(substr($data, $i + 1, 1));
+ if (($nextchar | 0xE0) == 0xE0) {
+ // previous byte = 11111111, this byte = 111?????
+ $unsyncheddata .= chr(0);
+ }
+ }
+ }
+ return $unsyncheddata;
+ }
+}
+
+if (!function_exists('is_hash')) {
+ function is_hash($var) {
+ // written by dev-null@christophe.vg
+ // taken from http://www.php.net/manual/en/function.array-merge-recursive.php
+ if (is_array($var)) {
+ $keys = array_keys($var);
+ $all_num = true;
+ for ($i = 0; $i < count($keys); $i++) {
+ if (is_string($keys[$i])) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+}
+
+if (!function_exists('array_join_merge')) {
+ function array_join_merge($arr1, $arr2) {
+ // written by dev-null@christophe.vg
+ // taken from http://www.php.net/manual/en/function.array-merge-recursive.php
+ if (is_array($arr1) && is_array($arr2)) {
+ // the same -> merge
+ $new_array = array();
+
+ if (is_hash($arr1) && is_hash($arr2)) {
+ // hashes -> merge based on keys
+ $keys = array_merge(array_keys($arr1), array_keys($arr2));
+ foreach ($keys as $key) {
+ $arr1[$key] = (isset($arr1[$key]) ? $arr1[$key] : '');
+ $arr2[$key] = (isset($arr2[$key]) ? $arr2[$key] : '');
+ $new_array[$key] = array_join_merge($arr1[$key], $arr2[$key]);
+ }
+ } else {
+ // two real arrays -> merge
+ $new_array = array_reverse(array_unique(array_reverse(array_merge($arr1,$arr2))));
+ }
+ return $new_array;
+ } else {
+ // not the same ... take new one if defined, else the old one stays
+ return $arr2 ? $arr2 : $arr1;
+ }
+ }
+}
+
+if (!function_exists('array_merge_clobber')) {
+ function array_merge_clobber($array1, $array2) {
+ // written by kc@hireability.com
+ // taken from http://www.php.net/manual/en/function.array-merge-recursive.php
+ if (!is_array($array1) || !is_array($array2)) {
+ return false;
+ }
+ $newarray = $array1;
+ foreach ($array2 as $key => $val) {
+ if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
+ $newarray[$key] = array_merge_clobber($newarray[$key], $val);
+ } else {
+ $newarray[$key] = $val;
+ }
+ }
+ return $newarray;
+ }
+}
+
+if (!function_exists('array_merge_noclobber')) {
+ function array_merge_noclobber($array1, $array2) {
+ if (!is_array($array1) || !is_array($array2)) {
+ return false;
+ }
+ $newarray = $array1;
+ foreach ($array2 as $key => $val) {
+ if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
+ $newarray[$key] = array_merge_noclobber($newarray[$key], $val);
+ } elseif (!isset($newarray[$key])) {
+ $newarray[$key] = $val;
+ }
+ }
+ return $newarray;
+ }
+}
+
+if (!function_exists('RoughTranslateUnicodeToASCII')) {
+ function RoughTranslateUnicodeToASCII($rawdata, $frame_textencoding) {
+ // rough translation of data for application that can't handle Unicode data
+
+ $tempstring = '';
+ switch ($frame_textencoding) {
+ case 0: // ISO-8859-1. Terminated with $00.
+ $asciidata = $rawdata;
+ break;
+
+ case 1: // UTF-16 encoded Unicode with BOM. Terminated with $00 00.
+ $asciidata = $rawdata;
+ if (substr($asciidata, 0, 2) == chr(0xFF).chr(0xFE)) {
+ // remove BOM, only if present (it should be, but...)
+ $asciidata = substr($asciidata, 2);
+ }
+ if (substr($asciidata, strlen($asciidata) - 2, 2) == chr(0).chr(0)) {
+ $asciidata = substr($asciidata, 0, strlen($asciidata) - 2); // remove terminator, only if present (it should be, but...)
+ }
+ for ($i = 0; $i < strlen($asciidata); $i += 2) {
+ if ((ord($asciidata{$i}) <= 0x7F) || (ord($asciidata{$i}) >= 0xA0)) {
+ $tempstring .= $asciidata{$i};
+ } else {
+ $tempstring .= '?';
+ }
+ }
+ $asciidata = $tempstring;
+ break;
+
+ case 2: // UTF-16BE encoded Unicode without BOM. Terminated with $00 00.
+ $asciidata = $rawdata;
+ if (substr($asciidata, strlen($asciidata) - 2, 2) == chr(0).chr(0)) {
+ $asciidata = substr($asciidata, 0, strlen($asciidata) - 2); // remove terminator, only if present (it should be, but...)
+ }
+ for ($i = 0; $i < strlen($asciidata); $i += 2) {
+ if ((ord($asciidata{$i}) <= 0x7F) || (ord($asciidata{$i}) >= 0xA0)) {
+ $tempstring .= $asciidata{$i};
+ } else {
+ $tempstring .= '?';
+ }
+ }
+ $asciidata = $tempstring;
+ break;
+
+ case 3: // UTF-8 encoded Unicode. Terminated with $00.
+ $asciidata = utf8_decode($rawdata);
+ break;
+
+ case 255: // Unicode, Big-Endian. Terminated with $00 00.
+ $asciidata = $rawdata;
+ if (substr($asciidata, strlen($asciidata) - 2, 2) == chr(0).chr(0)) {
+ $asciidata = substr($asciidata, 0, strlen($asciidata) - 2); // remove terminator, only if present (it should be, but...)
+ }
+ for ($i = 0; ($i + 1) < strlen($asciidata); $i += 2) {
+ if ((ord($asciidata{($i + 1)}) <= 0x7F) || (ord($asciidata{($i + 1)}) >= 0xA0)) {
+ $tempstring .= $asciidata{($i + 1)};
+ } else {
+ $tempstring .= '?';
+ }
+ }
+ $asciidata = $tempstring;
+ break;
+
+
+ default:
+ // shouldn't happen, but in case $frame_textencoding is not 1 <= $frame_textencoding <= 4
+ // just pass the data through unchanged.
+ $asciidata = $rawdata;
+ break;
+ }
+ if (substr($asciidata, strlen($asciidata) - 1, 1) == chr(0)) {
+ // remove null terminator, if present
+ $asciidata = NoNullString($asciidata);
+ }
+ return $asciidata;
+ // return str_replace(chr(0), '', $asciidata); // just in case any nulls slipped through
+ }
+}
+
+if (!function_exists('PlaytimeString')) {
+ function PlaytimeString($playtimeseconds) {
+ $contentseconds = round((($playtimeseconds / 60) - floor($playtimeseconds / 60)) * 60);
+ $contentminutes = floor($playtimeseconds / 60);
+ if ($contentseconds >= 60) {
+ $contentseconds -= 60;
+ $contentminutes++;
+ }
+ return number_format($contentminutes).':'.str_pad($contentseconds, 2, 0, STR_PAD_LEFT);
+ }
+}
+
+if (!function_exists('CloseMatch')) {
+ function CloseMatch($value1, $value2, $tolerance) {
+ return (abs($value1 - $value2) <= $tolerance);
+ }
+}
+
+if (!function_exists('ID3v1matchesID3v2')) {
+ function ID3v1matchesID3v2($id3v1, $id3v2) {
+
+ $requiredindices = array('title', 'artist', 'album', 'year', 'genre', 'comment');
+ foreach ($requiredindices as $requiredindex) {
+ if (!isset($id3v1["$requiredindex"])) {
+ $id3v1["$requiredindex"] = '';
+ }
+ if (!isset($id3v2["$requiredindex"])) {
+ $id3v2["$requiredindex"] = '';
+ }
+ }
+
+ if (trim($id3v1['title']) != trim(substr($id3v2['title'], 0, 30))) {
+ return false;
+ }
+ if (trim($id3v1['artist']) != trim(substr($id3v2['artist'], 0, 30))) {
+ return false;
+ }
+ if (trim($id3v1['album']) != trim(substr($id3v2['album'], 0, 30))) {
+ return false;
+ }
+ if (trim($id3v1['year']) != trim(substr($id3v2['year'], 0, 4))) {
+ return false;
+ }
+ if (trim($id3v1['genre']) != trim($id3v2['genre'])) {
+ return false;
+ }
+ if (isset($id3v1['track'])) {
+ if (!isset($id3v1['track']) || (trim($id3v1['track']) != trim($id3v2['track']))) {
+ return false;
+ }
+ if (trim($id3v1['comment']) != trim(substr($id3v2['comment'], 0, 28))) {
+ return false;
+ }
+ } else {
+ if (trim($id3v1['comment']) != trim(substr($id3v2['comment'], 0, 30))) {
+ return false;
+ }
+ }
+ return true;
+ }
+}
+
+if (!function_exists('FILETIMEtoUNIXtime')) {
+ function FILETIMEtoUNIXtime($FILETIME, $round=true) {
+ // FILETIME is a 64-bit unsigned integer representing
+ // the number of 100-nanosecond intervals since January 1, 1601
+ // UNIX timestamp is number of seconds since January 1, 1970
+ // 116444736000000000 = 10000000 * 60 * 60 * 24 * 365 * 369 + 89 leap days
+ if ($round) {
+ return round(($FILETIME - 116444736000000000) / 10000000);
+ }
+ return ($FILETIME - 116444736000000000) / 10000000;
+ }
+}
+
+if (!function_exists('GUIDtoBytestring')) {
+ function GUIDtoBytestring($GUIDstring) {
+ // Microsoft defines these 16-byte (128-bit) GUIDs in the strangest way:
+ // first 4 bytes are in little-endian order
+ // next 2 bytes are appended in little-endian order
+ // next 2 bytes are appended in little-endian order
+ // next 2 bytes are appended in big-endian order
+ // next 6 bytes are appended in big-endian order
+
+ // AaBbCcDd-EeFf-GgHh-IiJj-KkLlMmNnOoPp is stored as this 16-byte string:
+ // $Dd $Cc $Bb $Aa $Ff $Ee $Hh $Gg $Ii $Jj $Kk $Ll $Mm $Nn $Oo $Pp
+
+ $hexbytecharstring = chr(hexdec(substr($GUIDstring, 6, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 4, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 2, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 0, 2)));
+
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 11, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 9, 2)));
+
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 16, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 14, 2)));
+
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 19, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 21, 2)));
+
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 24, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 26, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 28, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 30, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 32, 2)));
+ $hexbytecharstring .= chr(hexdec(substr($GUIDstring, 34, 2)));
+
+ return $hexbytecharstring;
+ }
+}
+
+if (!function_exists('BytestringToGUID')) {
+ function BytestringToGUID($Bytestring) {
+ $GUIDstring = str_pad(dechex(ord($Bytestring{3})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{2})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{1})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{0})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= '-';
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{5})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{4})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= '-';
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{7})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{6})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= '-';
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{8})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{9})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= '-';
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{10})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{11})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{12})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{13})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{14})), 2, '0', STR_PAD_LEFT);
+ $GUIDstring .= str_pad(dechex(ord($Bytestring{15})), 2, '0', STR_PAD_LEFT);
+
+ return strtoupper($GUIDstring);
+ }
+}
+
+if (!function_exists('BitrateColor')) {
+ function BitrateColor($bitrate) {
+ $bitrate /= 3; // scale from 1-768kbps to 1-256kbps
+ $bitrate--; // scale from 1-256kbps to 0-255kbps
+ $bitrate = max($bitrate, 0);
+ $bitrate = min($bitrate, 255);
+ //$bitrate = max($bitrate, 32);
+ //$bitrate = min($bitrate, 143);
+ //$bitrate = ($bitrate * 2) - 32;
+
+ $Rcomponent = max(255 - ($bitrate * 2), 0);
+ $Gcomponent = max(($bitrate * 2) - 255, 0);
+ if ($bitrate > 127) {
+ $Bcomponent = max((255 - $bitrate) * 2, 0);
+ } else {
+ $Bcomponent = max($bitrate * 2, 0);
+ }
+ return str_pad(dechex($Rcomponent), 2, '0', STR_PAD_LEFT).str_pad(dechex($Gcomponent), 2, '0', STR_PAD_LEFT).str_pad(dechex($Bcomponent), 2, '0', STR_PAD_LEFT);
+ }
+}
+
+if (!function_exists('BitrateText')) {
+ function BitrateText($bitrate) {
+ return '<SPAN STYLE="color: #'.BitrateColor($bitrate).'">'.round($bitrate).' kbps</SPAN>';
+ }
+}
+
+if (!function_exists('image_type_to_mime_type')) {
+ function image_type_to_mime_type($imagetypeid) {
+ // only available in PHP v4.3.0+
+ static $image_type_to_mime_type = array();
+ if (empty($image_type_to_mime_type)) {
+ $image_type_to_mime_type[1] = 'image/gif'; // GIF
+ $image_type_to_mime_type[2] = 'image/jpeg'; // JPEG
+ $image_type_to_mime_type[3] = 'image/png'; // PNG
+ $image_type_to_mime_type[4] = 'application/x-shockwave-flash'; // Flash
+ $image_type_to_mime_type[5] = 'image/psd'; // PSD
+ $image_type_to_mime_type[6] = 'image/bmp'; // BMP
+ $image_type_to_mime_type[7] = 'image/tiff'; // TIFF: little-endian (Intel)
+ $image_type_to_mime_type[8] = 'image/tiff'; // TIFF: big-endian (Motorola)
+ //$image_type_to_mime_type[9] = 'image/jpc'; // JPC
+ //$image_type_to_mime_type[10] = 'image/jp2'; // JPC
+ //$image_type_to_mime_type[11] = 'image/jpx'; // JPC
+ //$image_type_to_mime_type[12] = 'image/jb2'; // JPC
+ $image_type_to_mime_type[13] = 'application/x-shockwave-flash'; // Shockwave
+ $image_type_to_mime_type[14] = 'image/iff'; // IFF
+ }
+ return (isset($image_type_to_mime_type[$imagetypeid]) ? $image_type_to_mime_type[$imagetypeid] : 'application/octet-stream');
+ }
+}
+
+if (!function_exists('utf8_decode')) {
+ // PHP has this function built-in if it's configured with the --with-xml option
+ // This version of the function is only provided in case XML isn't installed
+ function utf8_decode($utf8text) {
+ // http://www.php.net/manual/en/function.utf8-encode.php
+ // bytes bits representation
+ // 1 7 0bbbbbbb
+ // 2 11 110bbbbb 10bbbbbb
+ // 3 16 1110bbbb 10bbbbbb 10bbbbbb
+ // 4 21 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
+
+ $utf8length = strlen($utf8text);
+ $decodedtext = '';
+ for ($i = 0; $i < $utf8length; $i++) {
+ if ((ord($utf8text{$i}) & 0x80) == 0) {
+ $decodedtext .= $utf8text{$i};
+ } elseif ((ord($utf8text{$i}) & 0xF0) == 0xF0) {
+ $decodedtext .= '?';
+ $i += 3;
+ } elseif ((ord($utf8text{$i}) & 0xE0) == 0xE0) {
+ $decodedtext .= '?';
+ $i += 2;
+ } elseif ((ord($utf8text{$i}) & 0xC0) == 0xC0) {
+ // 2 11 110bbbbb 10bbbbbb
+ $decodedchar = Bin2Dec(substr(Dec2Bin(ord($utf8text{$i})), 3, 5).substr(Dec2Bin(ord($utf8text{($i + 1)})), 2, 6));
+ if ($decodedchar <= 255) {
+ $decodedtext .= chr($decodedchar);
+ } else {
+ $decodedtext .= '?';
+ }
+ $i += 1;
+ }
+ }
+ return $decodedtext;
+ }
+}
+
+if (!function_exists('DateMac2Unix')) {
+ function DateMac2Unix($macdate) {
+ // Macintosh timestamp: seconds since 00:00h January 1, 1904
+ // UNIX timestamp: seconds since 00:00h January 1, 1970
+ return CastAsInt($macdate - 2082844800);
+ }
+}
+
+
+if (!function_exists('FixedPoint8_8')) {
+ function FixedPoint8_8($rawdata) {
+ return BigEndian2Int(substr($rawdata, 0, 1)) + (float) (BigEndian2Int(substr($rawdata, 1, 1)) / pow(2, 8));
+ }
+}
+
+
+if (!function_exists('FixedPoint16_16')) {
+ function FixedPoint16_16($rawdata) {
+ return BigEndian2Int(substr($rawdata, 0, 2)) + (float) (BigEndian2Int(substr($rawdata, 2, 2)) / pow(2, 16));
+ }
+}
+
+
+if (!function_exists('FixedPoint2_30')) {
+ function FixedPoint2_30($rawdata) {
+ $binarystring = BigEndian2Bin($rawdata);
+ return Bin2Dec(substr($binarystring, 0, 2)) + (float) (Bin2Dec(substr($binarystring, 2, 30)) / pow(2, 30));
+ }
+}
+
+
+if (!function_exists('Pascal2String')) {
+ function Pascal2String($pascalstring) {
+ // Pascal strings have 1 byte at the beginning saying how many chars are in the string
+ return substr($pascalstring, 1);
+ }
+}
+
+if (!function_exists('NoNullString')) {
+ function NoNullString($nullterminatedstring) {
+ // remove the single null terminator on null terminated strings
+ if (substr($nullterminatedstring, strlen($nullterminatedstring) - 1, 1) === chr(0)) {
+ return substr($nullterminatedstring, 0, strlen($nullterminatedstring) - 1);
+ }
+ return $nullterminatedstring;
+ }
+}
+
+if (!function_exists('FileSizeNiceDisplay')) {
+ function FileSizeNiceDisplay($filesize, $precision=2) {
+ if ($filesize < 1000) {
+ $sizeunit = 'bytes';
+ $precision = 0;
+ } else {
+ $filesize /= 1024;
+ $sizeunit = 'kB';
+ }
+ if ($filesize >= 1000) {
+ $filesize /= 1024;
+ $sizeunit = 'MB';
+ }
+ if ($filesize >= 1000) {
+ $filesize /= 1024;
+ $sizeunit = 'GB';
+ }
+ return number_format($filesize, $precision).' '.$sizeunit;
+ }
+}
+
+if (!function_exists('DOStime2UNIXtime')) {
+ function DOStime2UNIXtime($DOSdate, $DOStime) {
+ // wFatDate
+ // Specifies the MS-DOS date. The date is a packed 16-bit value with the following format:
+ // Bits Contents
+ // 0-4 Day of the month (1-31)
+ // 5-8 Month (1 = January, 2 = February, and so on)
+ // 9-15 Year offset from 1980 (add 1980 to get actual year)
+
+ $UNIXday = ($DOSdate & 0x001F);
+ $UNIXmonth = (($DOSdate & 0x01E0) >> 5);
+ $UNIXyear = (($DOSdate & 0xFE00) >> 9) + 1980;
+
+ // wFatTime
+ // Specifies the MS-DOS time. The time is a packed 16-bit value with the following format:
+ // Bits Contents
+ // 0-4 Second divided by 2
+ // 5-10 Minute (0-59)
+ // 11-15 Hour (0-23 on a 24-hour clock)
+
+ $UNIXsecond = ($DOStime & 0x001F) * 2;
+ $UNIXminute = (($DOStime & 0x07E0) >> 5);
+ $UNIXhour = (($DOStime & 0xF800) >> 11);
+
+ return mktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
+ }
+}
+
+if (!function_exists('CreateDeepArray')) {
+ function CreateDeepArray($ArrayPath, $Separator, $Value) {
+ // assigns $Value to a nested array path:
+ // $foo = CreateDeepArray('/path/to/my', '/', 'file.txt')
+ // is the same as:
+ // $foo = array('path'=>array('to'=>'array('my'=>array('file.txt'))));
+ // or
+ // $foo['path']['to']['my'] = 'file.txt';
+ while ($ArrayPath{0} == $Separator) {
+ $ArrayPath = substr($ArrayPath, 1);
+ }
+ if (($pos = strpos($ArrayPath, $Separator)) !== false) {
+ $ReturnedArray[substr($ArrayPath, 0, $pos)] = CreateDeepArray(substr($ArrayPath, $pos + 1), $Separator, $Value);
+ } else {
+ $ReturnedArray["$ArrayPath"] = $Value;
+ }
+ return $ReturnedArray;
+ }
+}
+
+if (!function_exists('md5_file')) {
+ // Allan Hansen <ah@artemis.dk>
+ // md5_file() exists in PHP 4.2.0.
+ // The following works under UNIX only, but dies on windows
+ function md5_file($file) {
+ if (substr(php_uname(), 0, 7) == 'Windows') {
+ die('PHP 4.2.0 or newer required for md5_file()');
+ }
+
+ $file = str_replace('`', '\\`', $file);
+ if (preg_match("#^([0-9a-f]{32})[ \t\n\r]#i", `md5sum "$file"`, $r)) {
+ return $r[1];
+ }
+ return false;
+ }
+}
+
+if (!function_exists('md5_data')) {
+ // Allan Hansen <ah@artemis.dk>
+ // md5_data() - returns md5sum for a file from startuing position to absolute end position
+
+ function md5_data($file, $offset, $end, $invertsign=false) {
+ // first try and create a temporary file in the same directory as the file being scanned
+ if (($dataMD5filename = tempnam(dirname($file), preg_replace('#[^[:alnum:]]#i', '', basename($file)))) === false) {
+ // if that fails, create a temporary file in the system temp directory
+ if (($dataMD5filename = tempnam('/tmp', 'getID3')) === false) {
+ // if that fails, create a temporary file in the current directory
+ if (($dataMD5filename = tempnam('.', preg_replace('#[^[:alnum:]]#i', '', basename($file)))) === false) {
+ // can't find anywhere to create a temp file, just die
+ return false;
+ }
+ }
+ }
+ $md5 = false;
+ set_time_limit(max(filesize($file) / 1000000, 30));
+
+ // copy parts of file
+ ob_start();
+ if ($fp = fopen($file, 'rb')) {
+ ob_end_clean();
+
+ ob_start();
+ if ($MD5fp = fopen($dataMD5filename, 'wb')) {
+
+ ob_end_clean();
+ if ($invertsign) {
+ // Load conversion lookup strings for 8-bit unsigned->signed conversion below
+ $from = '';
+ $to = '';
+ for ($i = 0; $i < 128; $i++) {
+ $from .= chr($i);
+ $to .= chr($i + 128);
+ }
+ for ($i = 128; $i < 256; $i++) {
+ $from .= chr($i);
+ $to .= chr($i - 128);
+ }
+ }
+
+ fseek($fp, $offset, SEEK_SET);
+ $byteslefttowrite = $end - $offset;
+ while (($byteslefttowrite > 0) && ($buffer = fread($fp, 32768))) {
+ if ($invertsign) {
+ // Possibly FLAC-specific (?)
+ // FLAC calculates the MD5sum of the source data of 8-bit files
+ // not on the actual byte values in the source file, but of those
+ // values converted from unsigned to signed, or more specifcally,
+ // with the MSB inverted. ex: 01 -> 81; F5 -> 75; etc
+
+ // Therefore, 8-bit WAV data has to be converted before getting the
+ // md5_data value so as to match the FLAC value
+
+ // Flip the MSB for each byte in the buffer before copying
+ $buffer = strtr($buffer, $from, $to);
+ }
+ $byteswritten = fwrite($MD5fp, $buffer, $byteslefttowrite);
+ $byteslefttowrite -= $byteswritten;
+ }
+ fclose($MD5fp);
+ $md5 = md5_file($dataMD5filename);
+
+ } else {
+ $errormessage = ob_get_contents();
+ ob_end_clean();
+ }
+ fclose($fp);
+
+ } else {
+ $errormessage = ob_get_contents();
+ ob_end_clean();
+ }
+ unlink($dataMD5filename);
+ return $md5;
+ }
+}
+
+if (!function_exists('TwosCompliment2Decimal')) {
+ function TwosCompliment2Decimal($BinaryValue) {
+ // http://sandbox.mc.edu/~bennet/cs110/tc/tctod.html
+ // First check if the number is negative or positive by looking at the sign bit.
+ // If it is positive, simply convert it to decimal.
+ // If it is negative, make it positive by inverting the bits and adding one.
+ // Then, convert the result to decimal.
+ // The negative of this number is the value of the original binary.
+
+ if ($BinaryValue & 0x80) {
+
+ // negative number
+ return (0 - ((~$BinaryValue & 0xFF) + 1));
+
+ } else {
+
+ // positive number
+ return $BinaryValue;
+
+ }
+
+ }
+}
+
+if (!function_exists('LastArrayElement')) {
+ function LastArrayElement($MyArray) {
+ if (!is_array($MyArray)) {
+ return false;
+ }
+ if (empty($MyArray)) {
+ return null;
+ }
+ foreach ($MyArray as $key => $value) {
+ }
+ return $value;
+ }
+}
+
+if (!function_exists('safe_inc')) {
+ function safe_inc(&$variable, $increment=1) {
+ if (isset($variable)) {
+ $variable += $increment;
+ } else {
+ $variable = $increment;
+ }
+ return true;
+ }
+}
+
+if (!function_exists('CalculateCompressionRatioVideo')) {
+ function CalculateCompressionRatioVideo(&$ThisFileInfo) {
+ if (empty($ThisFileInfo['video'])) {
+ return false;
+ }
+ if (empty($ThisFileInfo['video']['resolution_x']) || empty($ThisFileInfo['video']['resolution_y'])) {
+ return false;
+ }
+ if (empty($ThisFileInfo['video']['bits_per_sample'])) {
+ return false;
+ }
+
+ switch ($ThisFileInfo['video']['dataformat']) {
+ case 'bmp':
+ case 'gif':
+ case 'jpeg':
+ case 'jpg':
+ case 'png':
+ case 'tiff':
+ $FrameRate = 1;
+ $PlaytimeSeconds = 1;
+ $BitrateCompressed = $ThisFileInfo['filesize'] * 8;
+ break;
+
+ default:
+ if (!empty($ThisFileInfo['video']['frame_rate'])) {
+ $FrameRate = $ThisFileInfo['video']['frame_rate'];
+ } else {
+ return false;
+ }
+ if (!empty($ThisFileInfo['playtime_seconds'])) {
+ $PlaytimeSeconds = $ThisFileInfo['playtime_seconds'];
+ } else {
+ return false;
+ }
+ if (!empty($ThisFileInfo['video']['bitrate'])) {
+ $BitrateCompressed = $ThisFileInfo['video']['bitrate'];
+ } else {
+ return false;
+ }
+ break;
+ }
+ $BitrateUncompressed = $ThisFileInfo['video']['resolution_x'] * $ThisFileInfo['video']['resolution_y'] * $ThisFileInfo['video']['bits_per_sample'] * $FrameRate;
+
+ $ThisFileInfo['video']['compression_ratio'] = $BitrateCompressed / $BitrateUncompressed;
+ return true;
+ }
+}
+
+if (!function_exists('CalculateCompressionRatioAudio')) {
+ function CalculateCompressionRatioAudio(&$ThisFileInfo) {
+ if (empty($ThisFileInfo['audio']['bitrate']) || empty($ThisFileInfo['audio']['channels']) || empty($ThisFileInfo['audio']['sample_rate']) || empty($ThisFileInfo['audio']['bits_per_sample'])) {
+ return false;
+ }
+ $ThisFileInfo['audio']['compression_ratio'] = $ThisFileInfo['audio']['bitrate'] / ($ThisFileInfo['audio']['channels'] * $ThisFileInfo['audio']['sample_rate'] * $ThisFileInfo['audio']['bits_per_sample']);
+ return true;
+ }
+}
+
+if (!function_exists('IsValidMIMEstring')) {
+ function IsValidMIMEstring($mimestring) {
+ if ((strlen($mimestring) >= 3) && (strpos($mimestring, '/') > 0) && (strpos($mimestring, '/') < (strlen($mimestring) - 1))) {
+ return true;
+ }
+ return false;
+ }
+}
+
+if (!function_exists('IsWithinBitRange')) {
+ function IsWithinBitRange($number, $maxbits, $signed=false) {
+ if ($signed) {
+ if (($number > (0 - pow(2, $maxbits - 1))) && ($number <= pow(2, $maxbits - 1))) {
+ return true;
+ }
+ } else {
+ if (($number >= 0) && ($number <= pow(2, $maxbits))) {
+ return true;
+ }
+ }
+ return false;
+ }
+}
+
+if (!function_exists('safe_parse_url')) {
+ function safe_parse_url($url) {
+ ob_start();
+ $parts = parse_url($url);
+ $errormessage = ob_get_contents();
+ ob_end_clean();
+ $parts['scheme'] = (isset($parts['scheme']) ? $parts['scheme'] : '');
+ $parts['host'] = (isset($parts['host']) ? $parts['host'] : '');
+ $parts['user'] = (isset($parts['user']) ? $parts['user'] : '');
+ $parts['pass'] = (isset($parts['pass']) ? $parts['pass'] : '');
+ $parts['path'] = (isset($parts['path']) ? $parts['path'] : '');
+ $parts['query'] = (isset($parts['query']) ? $parts['query'] : '');
+ return $parts;
+ }
+}
+
+if (!function_exists('IsValidURL')) {
+ function IsValidURL($url, $allowUserPass=false) {
+ if ($url == '') {
+ return false;
+ }
+ if ($allowUserPass !== true) {
+ if (strstr($url, '@')) {
+ // in the format http://user:pass@example.com or http://user@example.com
+ // but could easily be somebody incorrectly entering an email address in place of a URL
+ return false;
+ }
+ }
+ if ($parts = safe_parse_url($url)) {
+ if (($parts['scheme'] != 'http') && ($parts['scheme'] != 'https') && ($parts['scheme'] != 'ftp') && ($parts['scheme'] != 'gopher')) {
+ return false;
+ } elseif (!preg_match("#^[[:alnum:]]([-.]?[0-9a-z])*\.[a-z]{2,3}#i$", $parts['host'], $regs) && !preg_match('#^[0-9]{1,3}(\.[0-9]{1,3}){3}$#', $parts['host'])) {
+ return false;
+ } elseif (!preg_match("#^([[:alnum:]-]|[\_])*$#i", $parts['user'], $regs)) {
+ return false;
+ } elseif (!preg_match("#^([[:alnum:]-]|[\_])*$#i", $parts['pass'], $regs)) {
+ return false;
+ } elseif (!preg_match("#^[[:alnum:]/_\.@~-]*$#i", $parts['path'], $regs)) {
+ return false;
+ } elseif (!preg_match("#^[[:alnum:]?&=+:;_()%#/,\.-]*$#i", $parts['query'], $regs)) {
+ return false;
+ } else {
+ return true;
+ }
+ }
+ return false;
+ }
+}
+
+echo '<form action="'.htmlentities($_SERVER['PHP_SELF'], ENT_QUOTES).'" method="get">';
+echo 'Enter 4 hex bytes of MPEG-audio header (ie <I>FF FA 92 44</I>)<BR>';
+echo '<input type="text" name="HeaderHexBytes" value="'.htmlentities(isset($_POST['HeaderHexBytes']) ? strtoupper($_POST['HeaderHexBytes']) : '', ENT_QUOTES).'" size="11" maxlength="11">';
+echo '<input type="submit" name="Analyze" value="Analyze"></form>';
+echo '<hr>';
+
+echo '<form action="'.htmlentities($_SERVER['PHP_SELF'], ENT_QUOTES).'" METHOD="get">';
+echo 'Generate a MPEG-audio 4-byte header from these values:<BR>';
+echo '<table border="0">';
+
+$MPEGgenerateValues = array(
+ 'version'=>array('1', '2', '2.5'),
+ 'layer'=>array('I', 'II', 'III'),
+ 'protection'=>array('Y', 'N'),
+ 'bitrate'=>array('free', '8', '16', '24', '32', '40', '48', '56', '64', '80', '96', '112', '128', '144', '160', '176', '192', '224', '256', '288', '320', '352', '384', '416', '448'),
+ 'frequency'=>array('8000', '11025', '12000', '16000', '22050', '24000', '32000', '44100', '48000'),
+ 'padding'=>array('Y', 'N'),
+ 'private'=>array('Y', 'N'),
+ 'channelmode'=>array('stereo', 'joint stereo', 'dual channel', 'mono'),
+ 'modeextension'=>array('none', 'IS', 'MS', 'IS+MS', '4-31', '8-31', '12-31', '16-31'),
+ 'copyright'=>array('Y', 'N'),
+ 'original'=>array('Y', 'N'),
+ 'emphasis'=>array('none', '50/15ms', 'CCIT J.17')
+ );
+
+foreach ($MPEGgenerateValues as $name => $dataarray) {
+ echo '<tr><th>'.$name.':</th><td><select name="'.$name.'">';
+ foreach ($dataarray as $key => $value) {
+ echo '<option'.((isset($_POST["$name"]) && ($_POST["$name"] == $value)) ? ' SELECTED' : '').'>'.$value.'</option>';
+ }
+ echo '</select></td></tr>';
+}
+
+if (isset($_POST['bitrate'])) {
+ echo '<tr><th>Frame Length:</th><td>'.(int) MPEGaudioFrameLength($_POST['bitrate'], $_POST['version'], $_POST['layer'], (($_POST['padding'] == 'Y') ? '1' : '0'), $_POST['frequency']).'</td></tr>';
+}
+echo '</table>';
+echo '<input type="submit" name="Generate" value="Generate"></form>';
+echo '<hr>';
+
+
+if (isset($_POST['Analyze']) && $_POST['HeaderHexBytes']) {
+
+ $headerbytearray = explode(' ', $_POST['HeaderHexBytes']);
+ if (count($headerbytearray) != 4) {
+ die('Invalid byte pattern');
+ }
+ $headerstring = '';
+ foreach ($headerbytearray as $textbyte) {
+ $headerstring .= chr(hexdec($textbyte));
+ }
+
+ $MP3fileInfo['error'] = '';
+
+ $MPEGheaderRawArray = MPEGaudioHeaderDecode(substr($headerstring, 0, 4));
+
+ if (MPEGaudioHeaderValid($MPEGheaderRawArray, true)) {
+
+ $MP3fileInfo['raw'] = $MPEGheaderRawArray;
+
+ $MP3fileInfo['version'] = MPEGaudioVersionLookup($MP3fileInfo['raw']['version']);
+ $MP3fileInfo['layer'] = MPEGaudioLayerLookup($MP3fileInfo['raw']['layer']);
+ $MP3fileInfo['protection'] = MPEGaudioCRCLookup($MP3fileInfo['raw']['protection']);
+ $MP3fileInfo['bitrate'] = MPEGaudioBitrateLookup($MP3fileInfo['version'], $MP3fileInfo['layer'], $MP3fileInfo['raw']['bitrate']);
+ $MP3fileInfo['frequency'] = MPEGaudioFrequencyLookup($MP3fileInfo['version'], $MP3fileInfo['raw']['sample_rate']);
+ $MP3fileInfo['padding'] = (bool) $MP3fileInfo['raw']['padding'];
+ $MP3fileInfo['private'] = (bool) $MP3fileInfo['raw']['private'];
+ $MP3fileInfo['channelmode'] = MPEGaudioChannelModeLookup($MP3fileInfo['raw']['channelmode']);
+ $MP3fileInfo['channels'] = (($MP3fileInfo['channelmode'] == 'mono') ? 1 : 2);
+ $MP3fileInfo['modeextension'] = MPEGaudioModeExtensionLookup($MP3fileInfo['layer'], $MP3fileInfo['raw']['modeextension']);
+ $MP3fileInfo['copyright'] = (bool) $MP3fileInfo['raw']['copyright'];
+ $MP3fileInfo['original'] = (bool) $MP3fileInfo['raw']['original'];
+ $MP3fileInfo['emphasis'] = MPEGaudioEmphasisLookup($MP3fileInfo['raw']['emphasis']);
+
+ if ($MP3fileInfo['protection']) {
+ $MP3fileInfo['crc'] = BigEndian2Int(substr($headerstring, 4, 2));
+ }
+
+ if ($MP3fileInfo['frequency'] > 0) {
+ $MP3fileInfo['framelength'] = MPEGaudioFrameLength($MP3fileInfo['bitrate'], $MP3fileInfo['version'], $MP3fileInfo['layer'], (int) $MP3fileInfo['padding'], $MP3fileInfo['frequency']);
+ }
+ if ($MP3fileInfo['bitrate'] != 'free') {
+ $MP3fileInfo['bitrate'] *= 1000;
+ }
+
+ } else {
+
+ $MP3fileInfo['error'] .= "\n".'Invalid MPEG audio header';
+
+ }
+
+ if (!$MP3fileInfo['error']) {
+ unset($MP3fileInfo['error']);
+ }
+
+ echo table_var_dump($MP3fileInfo);
+
+} elseif (isset($_POST['Generate'])) {
+
+ // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
+
+ $headerbitstream = '11111111111'; // A - Frame sync (all bits set)
+
+ $MPEGversionLookup = array('2.5'=>'00', '2'=>'10', '1'=>'11');
+ $headerbitstream .= $MPEGversionLookup[$_POST['version']]; // B - MPEG Audio version ID
+
+ $MPEGlayerLookup = array('III'=>'01', 'II'=>'10', 'I'=>'11');
+ $headerbitstream .= $MPEGlayerLookup[$_POST['layer']]; // C - Layer description
+
+ $headerbitstream .= (($_POST['protection'] == 'Y') ? '0' : '1'); // D - Protection bit
+
+ $MPEGaudioBitrateLookup['1']['I'] = array('free'=>'0000', '32'=>'0001', '64'=>'0010', '96'=>'0011', '128'=>'0100', '160'=>'0101', '192'=>'0110', '224'=>'0111', '256'=>'1000', '288'=>'1001', '320'=>'1010', '352'=>'1011', '384'=>'1100', '416'=>'1101', '448'=>'1110');
+ $MPEGaudioBitrateLookup['1']['II'] = array('free'=>'0000', '32'=>'0001', '48'=>'0010', '56'=>'0011', '64'=>'0100', '80'=>'0101', '96'=>'0110', '112'=>'0111', '128'=>'1000', '160'=>'1001', '192'=>'1010', '224'=>'1011', '256'=>'1100', '320'=>'1101', '384'=>'1110');
+ $MPEGaudioBitrateLookup['1']['III'] = array('free'=>'0000', '32'=>'0001', '40'=>'0010', '48'=>'0011', '56'=>'0100', '64'=>'0101', '80'=>'0110', '96'=>'0111', '112'=>'1000', '128'=>'1001', '160'=>'1010', '192'=>'1011', '224'=>'1100', '256'=>'1101', '320'=>'1110');
+ $MPEGaudioBitrateLookup['2']['I'] = array('free'=>'0000', '32'=>'0001', '48'=>'0010', '56'=>'0011', '64'=>'0100', '80'=>'0101', '96'=>'0110', '112'=>'0111', '128'=>'1000', '144'=>'1001', '160'=>'1010', '176'=>'1011', '192'=>'1100', '224'=>'1101', '256'=>'1110');
+ $MPEGaudioBitrateLookup['2']['II'] = array('free'=>'0000', '8'=>'0001', '16'=>'0010', '24'=>'0011', '32'=>'0100', '40'=>'0101', '48'=>'0110', '56'=>'0111', '64'=>'1000', '80'=>'1001', '96'=>'1010', '112'=>'1011', '128'=>'1100', '144'=>'1101', '160'=>'1110');
+ $MPEGaudioBitrateLookup['2']['III'] = $MPEGaudioBitrateLookup['2']['II'];
+ $MPEGaudioBitrateLookup['2.5']['I'] = $MPEGaudioBitrateLookup['2']['I'];
+ $MPEGaudioBitrateLookup['2.5']['II'] = $MPEGaudioBitrateLookup['2']['II'];
+ $MPEGaudioBitrateLookup['2.5']['III'] = $MPEGaudioBitrateLookup['2']['II'];
+ if (isset($MPEGaudioBitrateLookup[$_POST['version']][$_POST['layer']][$_POST['bitrate']])) {
+ $headerbitstream .= $MPEGaudioBitrateLookup[$_POST['version']][$_POST['layer']][$_POST['bitrate']]; // E - Bitrate index
+ } else {
+ die('Invalid <B>Bitrate</B>');
+ }
+
+ $MPEGaudioFrequencyLookup['1'] = array('44100'=>'00', '48000'=>'01', '32000'=>'10');
+ $MPEGaudioFrequencyLookup['2'] = array('22050'=>'00', '24000'=>'01', '16000'=>'10');
+ $MPEGaudioFrequencyLookup['2.5'] = array('11025'=>'00', '12000'=>'01', '8000'=>'10');
+ if (isset($MPEGaudioFrequencyLookup[$_POST['version']][$_POST['frequency']])) {
+ $headerbitstream .= $MPEGaudioFrequencyLookup[$_POST['version']][$_POST['frequency']]; // F - Sampling rate frequency index
+ } else {
+ die('Invalid <B>Frequency</B>');
+ }
+
+ $headerbitstream .= (($_POST['padding'] == 'Y') ? '1' : '0'); // G - Padding bit
+
+ $headerbitstream .= (($_POST['private'] == 'Y') ? '1' : '0'); // H - Private bit
+
+ $MPEGaudioChannelModeLookup = array('stereo'=>'00', 'joint stereo'=>'01', 'dual channel'=>'10', 'mono'=>'11');
+ $headerbitstream .= $MPEGaudioChannelModeLookup[$_POST['channelmode']]; // I - Channel Mode
+
+ $MPEGaudioModeExtensionLookup['I'] = array('4-31'=>'00', '8-31'=>'01', '12-31'=>'10', '16-31'=>'11');
+ $MPEGaudioModeExtensionLookup['II'] = $MPEGaudioModeExtensionLookup['I'];
+ $MPEGaudioModeExtensionLookup['III'] = array('none'=>'00', 'IS'=>'01', 'MS'=>'10', 'IS+MS'=>'11');
+ if ($_POST['channelmode'] != 'joint stereo') {
+ $headerbitstream .= '00';
+ } elseif (isset($MPEGaudioModeExtensionLookup[$_POST['layer']][$_POST['modeextension']])) {
+ $headerbitstream .= $MPEGaudioModeExtensionLookup[$_POST['layer']][$_POST['modeextension']]; // J - Mode extension (Only if Joint stereo)
+ } else {
+ die('Invalid <B>Mode Extension</B>');
+ }
+
+ $headerbitstream .= (($_POST['copyright'] == 'Y') ? '1' : '0'); // K - Copyright
+
+ $headerbitstream .= (($_POST['original'] == 'Y') ? '1' : '0'); // L - Original
+
+ $MPEGaudioEmphasisLookup = array('none'=>'00', '50/15ms'=>'01', 'CCIT J.17'=>'11');
+ if (isset($MPEGaudioEmphasisLookup[$_POST['emphasis']])) {
+ $headerbitstream .= $MPEGaudioEmphasisLookup[$_POST['emphasis']]; // M - Emphasis
+ } else {
+ die('Invalid <B>Emphasis</B>');
+ }
+
+ echo strtoupper(str_pad(dechex(bindec(substr($headerbitstream, 0, 8))), 2, '0', STR_PAD_LEFT)).' ';
+ echo strtoupper(str_pad(dechex(bindec(substr($headerbitstream, 8, 8))), 2, '0', STR_PAD_LEFT)).' ';
+ echo strtoupper(str_pad(dechex(bindec(substr($headerbitstream, 16, 8))), 2, '0', STR_PAD_LEFT)).' ';
+ echo strtoupper(str_pad(dechex(bindec(substr($headerbitstream, 24, 8))), 2, '0', STR_PAD_LEFT)).'<BR>';
+
+}
+
+function MPEGaudioVersionLookup($rawversion) {
+ $MPEGaudioVersionLookup = array('2.5', FALSE, '2', '1');
+ return (isset($MPEGaudioVersionLookup["$rawversion"]) ? $MPEGaudioVersionLookup["$rawversion"] : FALSE);
+}
+
+function MPEGaudioLayerLookup($rawlayer) {
+ $MPEGaudioLayerLookup = array(FALSE, 'III', 'II', 'I');
+ return (isset($MPEGaudioLayerLookup["$rawlayer"]) ? $MPEGaudioLayerLookup["$rawlayer"] : FALSE);
+}
+
+function MPEGaudioBitrateLookup($version, $layer, $rawbitrate) {
+ static $MPEGaudioBitrateLookup;
+ if (empty($MPEGaudioBitrateLookup)) {
+ $MPEGaudioBitrateLookup = MPEGaudioBitrateArray();
+ }
+ return (isset($MPEGaudioBitrateLookup["$version"]["$layer"]["$rawbitrate"]) ? $MPEGaudioBitrateLookup["$version"]["$layer"]["$rawbitrate"] : FALSE);
+}
+
+function MPEGaudioFrequencyLookup($version, $rawfrequency) {
+ static $MPEGaudioFrequencyLookup;
+ if (empty($MPEGaudioFrequencyLookup)) {
+ $MPEGaudioFrequencyLookup = MPEGaudioFrequencyArray();
+ }
+ return (isset($MPEGaudioFrequencyLookup["$version"]["$rawfrequency"]) ? $MPEGaudioFrequencyLookup["$version"]["$rawfrequency"] : FALSE);
+}
+
+function MPEGaudioChannelModeLookup($rawchannelmode) {
+ $MPEGaudioChannelModeLookup = array('stereo', 'joint stereo', 'dual channel', 'mono');
+ return (isset($MPEGaudioChannelModeLookup["$rawchannelmode"]) ? $MPEGaudioChannelModeLookup["$rawchannelmode"] : FALSE);
+}
+
+function MPEGaudioModeExtensionLookup($layer, $rawmodeextension) {
+ $MPEGaudioModeExtensionLookup['I'] = array('4-31', '8-31', '12-31', '16-31');
+ $MPEGaudioModeExtensionLookup['II'] = array('4-31', '8-31', '12-31', '16-31');
+ $MPEGaudioModeExtensionLookup['III'] = array('', 'IS', 'MS', 'IS+MS');
+ return (isset($MPEGaudioModeExtensionLookup["$layer"]["$rawmodeextension"]) ? $MPEGaudioModeExtensionLookup["$layer"]["$rawmodeextension"] : FALSE);
+}
+
+function MPEGaudioEmphasisLookup($rawemphasis) {
+ $MPEGaudioEmphasisLookup = array('none', '50/15ms', FALSE, 'CCIT J.17');
+ return (isset($MPEGaudioEmphasisLookup["$rawemphasis"]) ? $MPEGaudioEmphasisLookup["$rawemphasis"] : FALSE);
+}
+
+function MPEGaudioCRCLookup($CRCbit) {
+ // inverse boolean cast :)
+ if ($CRCbit == '0') {
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net ///
+// or http://www.getid3.org ///
+/////////////////////////////////////////////////////////////////
+// //
+// getid3.mp3.php - part of getID3() //
+// See getid3.readme.txt for more details //
+// //
+/////////////////////////////////////////////////////////////////
+
+// number of frames to scan to determine if MPEG-audio sequence is valid
+// Lower this number to 5-20 for faster scanning
+// Increase this number to 50+ for most accurate detection of valid VBR/CBR
+// mpeg-audio streams
+define('MPEG_VALID_CHECK_FRAMES', 35);
+
+function getMP3headerFilepointer(&$fd, &$ThisFileInfo) {
+
+ getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $ThisFileInfo['avdataoffset']);
+
+ if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode'])) {
+ $ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']);
+ }
+
+ if (((isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) || (!isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0)))) {
+
+ $ThisFileInfo['warning'] .= "\n".'Unknown data before synch ';
+ if (isset($ThisFileInfo['id3v2']['headerlength'])) {
+ $ThisFileInfo['warning'] .= '(ID3v2 header ends at '.$ThisFileInfo['id3v2']['headerlength'].', then '.($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']).' bytes garbage, ';
+ } else {
+ $ThisFileInfo['warning'] .= '(should be at beginning of file, ';
+ }
+ $ThisFileInfo['warning'] .= 'synch detected at '.$ThisFileInfo['avdataoffset'].')';
+ if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
+ if (!empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength'])) {
+ $ThisFileInfo['warning'] .= '. This is a known problem with some versions of LAME (3.91, 3.92) DLL in CBR mode.';
+ $ThisFileInfo['audio']['codec'] = 'LAME';
+ } elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength'])) {
+ $ThisFileInfo['warning'] .= '. This is a known problem with some versions of LAME (3.91, 3.92) DLL in CBR mode.';
+ $ThisFileInfo['audio']['codec'] = 'LAME';
+ }
+ }
+
+ }
+
+ if (isset($ThisFileInfo['mpeg']['audio']['layer']) && ($ThisFileInfo['mpeg']['audio']['layer'] == 'II')) {
+ $ThisFileInfo['audio']['dataformat'] = 'mp2';
+ } elseif (isset($ThisFileInfo['mpeg']['audio']['layer']) && ($ThisFileInfo['mpeg']['audio']['layer'] == 'I')) {
+ $ThisFileInfo['audio']['dataformat'] = 'mp1';
+ }
+ if ($ThisFileInfo['fileformat'] == 'mp3') {
+ switch ($ThisFileInfo['audio']['dataformat']) {
+ case 'mp1':
+ case 'mp2':
+ case 'mp3':
+ $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
+ break;
+
+ default:
+ $ThisFileInfo['warning'] .= "\n".'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$ThisFileInfo['audio']['dataformat'].'"';
+ break;
+ }
+ }
+
+ if (empty($ThisFileInfo['fileformat'])) {
+ $ThisFileInfo['error'] .= "\n".'Synch not found';
+ unset($ThisFileInfo['fileformat']);
+ unset($ThisFileInfo['audio']['bitrate_mode']);
+ unset($ThisFileInfo['avdataoffset']);
+ unset($ThisFileInfo['avdataend']);
+ return false;
+ }
+
+ $ThisFileInfo['mime_type'] = 'audio/mpeg';
+ $ThisFileInfo['audio']['lossless'] = false;
+
+ // Calculate playtime
+ if (!isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0)) {
+ $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate'];
+ }
+
+ if (isset($ThisFileInfo['mpeg']['audio']['LAME'])) {
+ $ThisFileInfo['audio']['codec'] = 'LAME';
+ if (!empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version'])) {
+ $ThisFileInfo['audio']['encoder'] = trim($ThisFileInfo['mpeg']['audio']['LAME']['long_version']);
+ }
+ }
+
+ return true;
+}
+
+
+function decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
+
+ static $MPEGaudioVersionLookup;
+ static $MPEGaudioLayerLookup;
+ static $MPEGaudioBitrateLookup;
+ static $MPEGaudioFrequencyLookup;
+ static $MPEGaudioChannelModeLookup;
+ static $MPEGaudioModeExtensionLookup;
+ static $MPEGaudioEmphasisLookup;
+ if (empty($MPEGaudioVersionLookup)) {
+ $MPEGaudioVersionLookup = MPEGaudioVersionArray();
+ $MPEGaudioLayerLookup = MPEGaudioLayerArray();
+ $MPEGaudioBitrateLookup = MPEGaudioBitrateArray();
+ $MPEGaudioFrequencyLookup = MPEGaudioFrequencyArray();
+ $MPEGaudioChannelModeLookup = MPEGaudioChannelModeArray();
+ $MPEGaudioModeExtensionLookup = MPEGaudioModeExtensionArray();
+ $MPEGaudioEmphasisLookup = MPEGaudioEmphasisArray();
+ }
+
+ if ($offset >= $ThisFileInfo['avdataend']) {
+ $ThisFileInfo['error'] .= "\n".'end of file encounter looking for MPEG synch';
+ return false;
+ }
+ fseek($fd, $offset, SEEK_SET);
+ $headerstring = fread($fd, 1441); // worse-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
+
+ // MP3 audio frame structure:
+ // $aa $aa $aa $aa [$bb $bb] $cc...
+ // where $aa..$aa is the four-byte mpeg-audio header (below)
+ // $bb $bb is the optional 2-byte CRC
+ // and $cc... is the audio data
+
+ $head4 = substr($headerstring, 0, 4);
+
+ static $MPEGaudioHeaderDecodeCache = array();
+ if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
+ $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
+ } else {
+ $MPEGheaderRawArray = MPEGaudioHeaderDecode($head4);
+ $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
+ }
+
+ static $MPEGaudioHeaderValidCache = array();
+
+ // Not in cache
+ if (!isset($MPEGaudioHeaderValidCache[$head4])) {
+ $MPEGaudioHeaderValidCache[$head4] = MPEGaudioHeaderValid($MPEGheaderRawArray);
+ }
+
+ if ($MPEGaudioHeaderValidCache[$head4]) {
+ $ThisFileInfo['mpeg']['audio']['raw'] = $MPEGheaderRawArray;
+ } else {
+ $ThisFileInfo['error'] .= "\n".'Invalid MPEG audio header at offset '.$offset;
+ return false;
+ }
+
+ if (!$FastMPEGheaderScan) {
+
+ $ThisFileInfo['mpeg']['audio']['version'] = $MPEGaudioVersionLookup[$ThisFileInfo['mpeg']['audio']['raw']['version']];
+ $ThisFileInfo['mpeg']['audio']['layer'] = $MPEGaudioLayerLookup[$ThisFileInfo['mpeg']['audio']['raw']['layer']];
+
+ $ThisFileInfo['mpeg']['audio']['channelmode'] = $MPEGaudioChannelModeLookup[$ThisFileInfo['mpeg']['audio']['raw']['channelmode']];
+ $ThisFileInfo['mpeg']['audio']['channels'] = (($ThisFileInfo['mpeg']['audio']['channelmode'] == 'mono') ? 1 : 2);
+ $ThisFileInfo['mpeg']['audio']['sample_rate'] = $MPEGaudioFrequencyLookup[$ThisFileInfo['mpeg']['audio']['version']][$ThisFileInfo['mpeg']['audio']['raw']['sample_rate']];
+ $ThisFileInfo['mpeg']['audio']['protection'] = !$ThisFileInfo['mpeg']['audio']['raw']['protection'];
+ $ThisFileInfo['mpeg']['audio']['private'] = (bool) $ThisFileInfo['mpeg']['audio']['raw']['private'];
+ $ThisFileInfo['mpeg']['audio']['modeextension'] = $MPEGaudioModeExtensionLookup[$ThisFileInfo['mpeg']['audio']['layer']][$ThisFileInfo['mpeg']['audio']['raw']['modeextension']];
+ $ThisFileInfo['mpeg']['audio']['copyright'] = (bool) $ThisFileInfo['mpeg']['audio']['raw']['copyright'];
+ $ThisFileInfo['mpeg']['audio']['original'] = (bool) $ThisFileInfo['mpeg']['audio']['raw']['original'];
+ $ThisFileInfo['mpeg']['audio']['emphasis'] = $MPEGaudioEmphasisLookup[$ThisFileInfo['mpeg']['audio']['raw']['emphasis']];
+
+ $ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
+ $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
+
+ if ($ThisFileInfo['mpeg']['audio']['protection']) {
+ $ThisFileInfo['mpeg']['audio']['crc'] = BigEndian2Int(substr($headerstring, 4, 2));
+ }
+
+ }
+
+ if ($ThisFileInfo['mpeg']['audio']['raw']['bitrate'] == 15) {
+ // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
+ $ThisFileInfo['warning'] .= "\n".'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
+ $ThisFileInfo['mpeg']['audio']['raw']['bitrate'] = 0;
+ }
+ $ThisFileInfo['mpeg']['audio']['padding'] = (bool) $ThisFileInfo['mpeg']['audio']['raw']['padding'];
+ $ThisFileInfo['mpeg']['audio']['bitrate'] = $MPEGaudioBitrateLookup[$ThisFileInfo['mpeg']['audio']['version']][$ThisFileInfo['mpeg']['audio']['layer']][$ThisFileInfo['mpeg']['audio']['raw']['bitrate']];
+
+ if (($ThisFileInfo['mpeg']['audio']['bitrate'] == 'free') && ($offset == $ThisFileInfo['avdataoffset'])) {
+ // only skip multiple frame check if free-format bitstream found at beginning of file
+ // otherwise is quite possibly simply corrupted data
+ $recursivesearch = false;
+ }
+
+ // For Layer II there are some combinations of bitrate and mode which are not allowed.
+ if (!$FastMPEGheaderScan && ($ThisFileInfo['mpeg']['audio']['layer'] == 'II')) {
+
+ $ThisFileInfo['audio']['dataformat'] = 'mp2';
+ switch ($ThisFileInfo['mpeg']['audio']['channelmode']) {
+
+ case 'mono':
+ if (($ThisFileInfo['mpeg']['audio']['bitrate'] == 'free') || ($ThisFileInfo['mpeg']['audio']['bitrate'] <= 192)) {
+ // these are ok
+ } else {
+ $ThisFileInfo['error'] .= "\n".$ThisFileInfo['mpeg']['audio']['bitrate'].'kbps not allowed in Layer II, '.$ThisFileInfo['mpeg']['audio']['channelmode'].'.';
+ return false;
+ }
+ break;
+
+ case 'stereo':
+ case 'joint stereo':
+ case 'dual channel':
+ if (($ThisFileInfo['mpeg']['audio']['bitrate'] == 'free') || ($ThisFileInfo['mpeg']['audio']['bitrate'] == 64) || ($ThisFileInfo['mpeg']['audio']['bitrate'] >= 96)) {
+ // these are ok
+ } else {
+ $ThisFileInfo['error'] .= "\n".$ThisFileInfo['mpeg']['audio']['bitrate'].'kbps not allowed in Layer II, '.$ThisFileInfo['mpeg']['audio']['channelmode'].'.';
+ return false;
+ }
+ break;
+
+ }
+
+ }
+
+
+ if ($ThisFileInfo['audio']['sample_rate'] > 0) {
+ $ThisFileInfo['mpeg']['audio']['framelength'] = MPEGaudioFrameLength($ThisFileInfo['mpeg']['audio']['bitrate'], $ThisFileInfo['mpeg']['audio']['version'], $ThisFileInfo['mpeg']['audio']['layer'], (int) $ThisFileInfo['mpeg']['audio']['padding'], $ThisFileInfo['audio']['sample_rate']);
+ }
+
+ if ($ThisFileInfo['mpeg']['audio']['bitrate'] != 'free') {
+
+ $ThisFileInfo['audio']['bitrate'] = 1000 * $ThisFileInfo['mpeg']['audio']['bitrate'];
+
+ if (isset($ThisFileInfo['mpeg']['audio']['framelength'])) {
+ $nextframetestoffset = $offset + $ThisFileInfo['mpeg']['audio']['framelength'];
+ } else {
+ $ThisFileInfo['error'] .= "\n".'Frame at offset('.$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
+
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
+ $ThisFileInfo['mpeg']['audio']['VBR_method'] = 'Fraunhofer';
+ $ThisFileInfo['audio']['codec'] = 'Fraunhofer';
+
+ $SideInfoData = substr($headerstring, 4 + 2, 32);
+
+ $FraunhoferVBROffset = 36;
+
+ $ThisFileInfo['mpeg']['audio']['VBR_encoder_version'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2));
+ $ThisFileInfo['mpeg']['audio']['VBR_encoder_delay'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2));
+ $ThisFileInfo['mpeg']['audio']['VBR_quality'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2));
+ $ThisFileInfo['mpeg']['audio']['VBR_bytes'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4));
+ $ThisFileInfo['mpeg']['audio']['VBR_frames'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4));
+ $ThisFileInfo['mpeg']['audio']['VBR_seek_offsets'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2));
+ //$ThisFileInfo['mpeg']['audio']['reserved'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 4)); // hardcoded $00 $01 $00 $02 - purpose unknown
+ $ThisFileInfo['mpeg']['audio']['VBR_seek_offsets_stride'] = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2));
+
+ $ExpectedNumberOfAudioBytes = $ThisFileInfo['mpeg']['audio']['VBR_bytes'];
+
+ $previousbyteoffset = $offset;
+ for ($i = 0; $i < $ThisFileInfo['mpeg']['audio']['VBR_seek_offsets']; $i++) {
+ $Fraunhofer_OffsetN = BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, 2));
+ $FraunhoferVBROffset += 2;
+ $ThisFileInfo['mpeg']['audio']['VBR_offsets_relative'][$i] = $Fraunhofer_OffsetN;
+ $ThisFileInfo['mpeg']['audio']['VBR_offsets_absolute'][$i] = $Fraunhofer_OffsetN + $previousbyteoffset;
+ $previousbyteoffset += $Fraunhofer_OffsetN;
+ }
+
+
+ } else {
+
+ // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
+ // depending on MPEG layer and number of channels
+
+ if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ if ($ThisFileInfo['mpeg']['audio']['channelmode'] == 'mono') {
+ // MPEG-1 (mono)
+ $VBRidOffset = 4 + 17; // 0x15
+ $SideInfoData = substr($headerstring, 4 + 2, 17);
+ } else {
+ // MPEG-1 (stereo, joint-stereo, dual-channel)
+ $VBRidOffset = 4 + 32; // 0x24
+ $SideInfoData = substr($headerstring, 4 + 2, 32);
+ }
+ } else { // 2 or 2.5
+ if ($ThisFileInfo['mpeg']['audio']['channelmode'] == 'mono') {
+ // MPEG-2, MPEG-2.5 (mono)
+ $VBRidOffset = 4 + 9; // 0x0D
+ $SideInfoData = substr($headerstring, 4 + 2, 9);
+ } else {
+ // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
+ $VBRidOffset = 4 + 17; // 0x15
+ $SideInfoData = substr($headerstring, 4 + 2, 17);
+ }
+ }
+
+ 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.)
+
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
+ $ThisFileInfo['mpeg']['audio']['VBR_method'] = 'Xing';
+
+ $ThisFileInfo['mpeg']['audio']['xing_flags_raw'] = BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
+
+ $ThisFileInfo['mpeg']['audio']['xing_flags']['frames'] = (bool) ($ThisFileInfo['mpeg']['audio']['xing_flags_raw'] & 0x00000001);
+ $ThisFileInfo['mpeg']['audio']['xing_flags']['bytes'] = (bool) ($ThisFileInfo['mpeg']['audio']['xing_flags_raw'] & 0x00000002);
+ $ThisFileInfo['mpeg']['audio']['xing_flags']['toc'] = (bool) ($ThisFileInfo['mpeg']['audio']['xing_flags_raw'] & 0x00000004);
+ $ThisFileInfo['mpeg']['audio']['xing_flags']['vbr_scale'] = (bool) ($ThisFileInfo['mpeg']['audio']['xing_flags_raw'] & 0x00000008);
+
+ if ($ThisFileInfo['mpeg']['audio']['xing_flags']['frames']) {
+ $ThisFileInfo['mpeg']['audio']['VBR_frames'] = BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));
+ }
+ if ($ThisFileInfo['mpeg']['audio']['xing_flags']['bytes']) {
+ $ThisFileInfo['mpeg']['audio']['VBR_bytes'] = BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
+ }
+
+ if (($ThisFileInfo['mpeg']['audio']['bitrate'] == 'free') && !empty($ThisFileInfo['mpeg']['audio']['VBR_frames']) && !empty($ThisFileInfo['mpeg']['audio']['VBR_bytes'])) {
+ $framelengthfloat = $ThisFileInfo['mpeg']['audio']['VBR_bytes'] / $ThisFileInfo['mpeg']['audio']['VBR_frames'];
+ if ($ThisFileInfo['mpeg']['audio']['layer'] == 'I') {
+ // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
+ $ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($ThisFileInfo['mpeg']['audio']['padding'])) * $ThisFileInfo['mpeg']['audio']['sample_rate']) / 12;
+ } else {
+ // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
+ $ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($ThisFileInfo['mpeg']['audio']['padding'])) * $ThisFileInfo['mpeg']['audio']['sample_rate']) / 144;
+ }
+ $ThisFileInfo['mpeg']['audio']['framelength'] = floor($framelengthfloat);
+ }
+
+ if ($ThisFileInfo['mpeg']['audio']['xing_flags']['toc']) {
+ $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
+ for ($i = 0; $i < 100; $i++) {
+ $ThisFileInfo['mpeg']['audio']['toc'][$i] = ord($LAMEtocData{$i});
+ }
+ }
+ if ($ThisFileInfo['mpeg']['audio']['xing_flags']['vbr_scale']) {
+ $ThisFileInfo['mpeg']['audio']['VBR_scale'] = BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
+ }
+
+ // http://gabriel.mp3-tech.org/mp3infotag.html
+ if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
+ $ThisFileInfo['mpeg']['audio']['LAME']['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
+ $ThisFileInfo['mpeg']['audio']['LAME']['short_version'] = substr($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], 0, 9);
+ $ThisFileInfo['mpeg']['audio']['LAME']['long_version'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x55\xAA");
+
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['short_version'] >= 'LAME3.90.') {
+
+ // It the LAME tag was only introduced in LAME v3.90
+ // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
+
+ // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
+ // are assuming a 'Xing' identifier offset of 0x24, which is the case for
+ // MPEG-1 non-mono, but not for other combinations
+ $LAMEtagOffsetContant = $VBRidOffset - 0x24;
+
+ // byte $9B VBR Quality
+ // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
+ // Actually overwrites original Xing bytes
+ unset($ThisFileInfo['mpeg']['audio']['VBR_scale']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['vbr_quality'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
+
+ // bytes $9C-$A4 Encoder short VersionString
+ $ThisFileInfo['mpeg']['audio']['LAME']['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
+ $ThisFileInfo['mpeg']['audio']['LAME']['long_version'] = $ThisFileInfo['mpeg']['audio']['LAME']['short_version'];
+
+ // byte $A5 Info Tag revision + VBR method
+ $LAMEtagRevisionVBRmethod = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
+
+ $ThisFileInfo['mpeg']['audio']['LAME']['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
+ $ThisFileInfo['mpeg']['audio']['LAME']['vbr_method'] = LAMEvbrMethodLookup($ThisFileInfo['mpeg']['audio']['LAME']['raw']['vbr_method']);
+
+ // byte $A6 Lowpass filter value
+ $ThisFileInfo['mpeg']['audio']['LAME']['lowpass_frequency'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
+
+ // bytes $A7-$AE Replay Gain
+ // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
+ // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'] = BigEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_radio'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_audiophile'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
+
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'] == 0) {
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'] = false;
+ }
+
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_radio'] != 0) {
+ require_once(GETID3_INCLUDEPATH.'getid3.rgad.php');
+
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['name'] = ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_radio'] & 0xE000) >> 13;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['originator'] = ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_radio'] & 0x1C00) >> 10;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['sign_bit'] = ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_radio'] & 0x0200) >> 9;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['gain_adjust'] = $ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_radio'] & 0x01FF;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['name'] = RGADnameLookup($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['name']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['originator'] = RGADoriginatorLookup($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['originator']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['gain_db'] = RGADadjustmentLookup($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['gain_adjust'], $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['raw']['sign_bit']);
+
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'] !== false) {
+ $ThisFileInfo['replay_gain']['radio']['peak'] = $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'];
+ }
+ $ThisFileInfo['replay_gain']['radio']['originator'] = $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['originator'];
+ $ThisFileInfo['replay_gain']['radio']['adjustment'] = $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['radio']['gain_db'];
+ }
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_audiophile'] != 0) {
+ require_once(GETID3_INCLUDEPATH.'getid3.rgad.php');
+
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['name'] = ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_audiophile'] & 0xE000) >> 13;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['originator'] = ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_audiophile'] & 0x1C00) >> 10;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['sign_bit'] = ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_audiophile'] & 0x0200) >> 9;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['gain_adjust'] = $ThisFileInfo['mpeg']['audio']['LAME']['raw']['RGAD_audiophile'] & 0x01FF;
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['name'] = RGADnameLookup($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['name']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['originator'] = RGADoriginatorLookup($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['originator']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['gain_db'] = RGADadjustmentLookup($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['gain_adjust'], $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['raw']['sign_bit']);
+
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'] !== false) {
+ $ThisFileInfo['replay_gain']['audiophile']['peak'] = $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['peak_amplitude'];
+ }
+ $ThisFileInfo['replay_gain']['audiophile']['originator'] = $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['originator'];
+ $ThisFileInfo['replay_gain']['audiophile']['adjustment'] = $ThisFileInfo['mpeg']['audio']['LAME']['RGAD']['audiophile']['gain_db'];
+ }
+
+
+ // byte $AF Encoding flags + ATH Type
+ $EncodingFlagsATHtype = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
+ $ThisFileInfo['mpeg']['audio']['LAME']['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
+ $ThisFileInfo['mpeg']['audio']['LAME']['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
+ $ThisFileInfo['mpeg']['audio']['LAME']['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
+ $ThisFileInfo['mpeg']['audio']['LAME']['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
+ $ThisFileInfo['mpeg']['audio']['LAME']['ath_type'] = $EncodingFlagsATHtype & 0x0F;
+
+ // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
+ $ABRbitrateMinBitrate = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['vbr_method'] == 2) { // Average BitRate (ABR)
+ $ThisFileInfo['mpeg']['audio']['LAME']['bitrate_abr'] = $ABRbitrateMinBitrate;
+ } elseif ($ABRbitrateMinBitrate > 0) { // Variable BitRate (VBR) - minimum bitrate
+ $ThisFileInfo['mpeg']['audio']['LAME']['bitrate_min'] = $ABRbitrateMinBitrate;
+ }
+
+ // bytes $B1-$B3 Encoder delays
+ $EncoderDelays = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
+ $ThisFileInfo['mpeg']['audio']['LAME']['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
+ $ThisFileInfo['mpeg']['audio']['LAME']['end_padding'] = $EncoderDelays & 0x000FFF;
+
+ // byte $B4 Misc
+ $MiscByte = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['noise_shaping'] = ($MiscByte & 0x03);
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
+ $ThisFileInfo['mpeg']['audio']['LAME']['noise_shaping'] = $ThisFileInfo['mpeg']['audio']['LAME']['raw']['noise_shaping'];
+ $ThisFileInfo['mpeg']['audio']['LAME']['stereo_mode'] = LAMEmiscStereoModeLookup($ThisFileInfo['mpeg']['audio']['LAME']['raw']['stereo_mode']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['not_optimal_quality'] = (bool) $ThisFileInfo['mpeg']['audio']['LAME']['raw']['not_optimal_quality'];
+ $ThisFileInfo['mpeg']['audio']['LAME']['source_sample_freq'] = LAMEmiscSourceSampleFrequencyLookup($ThisFileInfo['mpeg']['audio']['LAME']['raw']['source_sample_freq']);
+
+ // byte $B5 MP3 Gain
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['mp3_gain'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
+ $ThisFileInfo['mpeg']['audio']['LAME']['mp3_gain_db'] = 1.5 * $ThisFileInfo['mpeg']['audio']['LAME']['raw']['mp3_gain'];
+ $ThisFileInfo['mpeg']['audio']['LAME']['mp3_gain_factor'] = pow(2, ($ThisFileInfo['mpeg']['audio']['LAME']['mp3_gain_db'] / 6));
+
+ // bytes $B6-$B7 Preset and surround info
+ $PresetSurroundBytes = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
+ // Reserved = ($PresetSurroundBytes & 0xC000);
+ $ThisFileInfo['mpeg']['audio']['LAME']['raw']['surround_info'] = ($PresetSurroundBytes & 0x3800);
+ $ThisFileInfo['mpeg']['audio']['LAME']['surround_info'] = LAMEsurroundInfoLookup($ThisFileInfo['mpeg']['audio']['LAME']['raw']['surround_info']);
+ $ThisFileInfo['mpeg']['audio']['LAME']['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
+
+ // bytes $B8-$BB MusicLength
+ $ThisFileInfo['mpeg']['audio']['LAME']['audio_bytes'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
+ $ExpectedNumberOfAudioBytes = (($ThisFileInfo['mpeg']['audio']['LAME']['audio_bytes'] > 0) ? $ThisFileInfo['mpeg']['audio']['LAME']['audio_bytes'] : $ThisFileInfo['mpeg']['audio']['VBR_bytes']);
+
+ // bytes $BC-$BD MusicCRC
+ $ThisFileInfo['mpeg']['audio']['LAME']['music_crc'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
+
+ // bytes $BE-$BF CRC-16 of Info Tag
+ $ThisFileInfo['mpeg']['audio']['LAME']['lame_tag_crc'] = BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
+
+
+ // LAME CBR
+ if ($ThisFileInfo['mpeg']['audio']['LAME']['raw']['vbr_method'] == 1) {
+
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
+ if (empty($ThisFileInfo['mpeg']['audio']['bitrate']) || ($ThisFileInfo['mpeg']['audio']['LAME']['bitrate_min'] != 255)) {
+ $ThisFileInfo['mpeg']['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['LAME']['bitrate_min'];
+ }
+
+ }
+
+ }
+ }
+
+ } else {
+
+ // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
+ if ($recursivesearch) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
+ if (RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) {
+ $recursivesearch = false;
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
+ }
+ if ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') {
+ $ThisFileInfo['warning'] .= "\n".'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
+ }
+ }
+
+ }
+
+ }
+
+ if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']))) {
+ if (($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) == 1) {
+ $ThisFileInfo['warning'] .= "\n".'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
+ } elseif ($ExpectedNumberOfAudioBytes > ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) {
+ $ThisFileInfo['warning'] .= "\n".'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])).' bytes)';
+ } else {
+ $ThisFileInfo['warning'] .= "\n".'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
+ }
+ }
+
+ if (($ThisFileInfo['mpeg']['audio']['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) {
+ if (($offset == $ThisFileInfo['avdataoffset']) && empty($ThisFileInfo['mpeg']['audio']['VBR_frames'])) {
+ $framebytelength = FreeFormatFrameLength($fd, $offset, $ThisFileInfo, true);
+ if ($framebytelength > 0) {
+ $ThisFileInfo['mpeg']['audio']['framelength'] = $framebytelength;
+ if ($ThisFileInfo['mpeg']['audio']['layer'] == 'I') {
+ // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
+ $ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($ThisFileInfo['mpeg']['audio']['padding'])) * $ThisFileInfo['mpeg']['audio']['sample_rate']) / 12;
+ } else {
+ // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
+ $ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($ThisFileInfo['mpeg']['audio']['padding'])) * $ThisFileInfo['mpeg']['audio']['sample_rate']) / 144;
+ }
+ } else {
+ $ThisFileInfo['error'] .= "\n".'Error calculating frame length of free-format MP3 without Xing/LAME header';
+ }
+ }
+ }
+
+ if (($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && isset($ThisFileInfo['mpeg']['audio']['VBR_frames']) && ($ThisFileInfo['mpeg']['audio']['VBR_frames'] > 1)) {
+ $ThisFileInfo['mpeg']['audio']['VBR_frames']--; // don't count the Xing / VBRI frame
+ if (($ThisFileInfo['mpeg']['audio']['version'] == '1') && ($ThisFileInfo['mpeg']['audio']['layer'] == 'I')) {
+ $ThisFileInfo['mpeg']['audio']['VBR_bitrate'] = ((($ThisFileInfo['mpeg']['audio']['VBR_bytes'] / $ThisFileInfo['mpeg']['audio']['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384)) / 1000;
+ } elseif ((($ThisFileInfo['mpeg']['audio']['version'] == '2') || ($ThisFileInfo['mpeg']['audio']['version'] == '2.5')) && ($ThisFileInfo['mpeg']['audio']['layer'] == 'III')) {
+ $ThisFileInfo['mpeg']['audio']['VBR_bitrate'] = ((($ThisFileInfo['mpeg']['audio']['VBR_bytes'] / $ThisFileInfo['mpeg']['audio']['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576)) / 1000;
+ } else {
+ $ThisFileInfo['mpeg']['audio']['VBR_bitrate'] = ((($ThisFileInfo['mpeg']['audio']['VBR_bytes'] / $ThisFileInfo['mpeg']['audio']['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152)) / 1000;
+ }
+ if ($ThisFileInfo['mpeg']['audio']['VBR_bitrate'] > 0) {
+ $ThisFileInfo['audio']['bitrate'] = 1000 * $ThisFileInfo['mpeg']['audio']['VBR_bitrate'];
+ $ThisFileInfo['mpeg']['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['VBR_bitrate']; // to avoid confusion
+ }
+ }
+
+ // End variable-bitrate headers
+ ////////////////////////////////////////////////////////////////////////////////////
+
+ if ($recursivesearch) {
+
+ if (!RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, $ScanAsCBR)) {
+ return false;
+ }
+
+ }
+
+
+ //if (false) {
+ // // experimental side info parsing section - not returning anything useful yet
+ //
+ // $SideInfoBitstream = BigEndian2Bin($SideInfoData);
+ // $SideInfoOffset = 0;
+ //
+ // if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ // if ($ThisFileInfo['mpeg']['audio']['channelmode'] == 'mono') {
+ // // MPEG-1 (mono)
+ // $ThisFileInfo['mpeg']['audio']['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
+ // $SideInfoOffset += 9;
+ // $SideInfoOffset += 5;
+ // } else {
+ // // MPEG-1 (stereo, joint-stereo, dual-channel)
+ // $ThisFileInfo['mpeg']['audio']['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
+ // $SideInfoOffset += 9;
+ // $SideInfoOffset += 3;
+ // }
+ // } else { // 2 or 2.5
+ // if ($ThisFileInfo['mpeg']['audio']['channelmode'] == 'mono') {
+ // // MPEG-2, MPEG-2.5 (mono)
+ // $ThisFileInfo['mpeg']['audio']['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
+ // $SideInfoOffset += 8;
+ // $SideInfoOffset += 1;
+ // } else {
+ // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
+ // $ThisFileInfo['mpeg']['audio']['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
+ // $SideInfoOffset += 8;
+ // $SideInfoOffset += 2;
+ // }
+ // }
+ //
+ // if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) {
+ // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
+ // $ThisFileInfo['mpeg']['audio']['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 2;
+ // }
+ // }
+ // }
+ // for ($granule = 0; $granule < (($ThisFileInfo['mpeg']['audio']['version'] == '1') ? 2 : 1); $granule++) {
+ // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) {
+ // $ThisFileInfo['mpeg']['audio']['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
+ // $SideInfoOffset += 12;
+ // $ThisFileInfo['mpeg']['audio']['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
+ // $SideInfoOffset += 9;
+ // $ThisFileInfo['mpeg']['audio']['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
+ // $SideInfoOffset += 8;
+ // if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ // $ThisFileInfo['mpeg']['audio']['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
+ // $SideInfoOffset += 4;
+ // } else {
+ // $ThisFileInfo['mpeg']['audio']['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
+ // $SideInfoOffset += 9;
+ // }
+ // $ThisFileInfo['mpeg']['audio']['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ //
+ // if ($ThisFileInfo['mpeg']['audio']['window_switching_flag'][$granule][$channel] == '1') {
+ //
+ // $ThisFileInfo['mpeg']['audio']['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
+ // $SideInfoOffset += 2;
+ // $ThisFileInfo['mpeg']['audio']['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ //
+ // for ($region = 0; $region < 2; $region++) {
+ // $ThisFileInfo['mpeg']['audio']['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
+ // $SideInfoOffset += 5;
+ // }
+ // $ThisFileInfo['mpeg']['audio']['table_select'][$granule][$channel][2] = 0;
+ //
+ // for ($window = 0; $window < 3; $window++) {
+ // $ThisFileInfo['mpeg']['audio']['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
+ // $SideInfoOffset += 3;
+ // }
+ //
+ // } else {
+ //
+ // for ($region = 0; $region < 3; $region++) {
+ // $ThisFileInfo['mpeg']['audio']['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
+ // $SideInfoOffset += 5;
+ // }
+ //
+ // $ThisFileInfo['mpeg']['audio']['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
+ // $SideInfoOffset += 4;
+ // $ThisFileInfo['mpeg']['audio']['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
+ // $SideInfoOffset += 3;
+ // $ThisFileInfo['mpeg']['audio']['block_type'][$granule][$channel] = 0;
+ // }
+ //
+ // if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ // $ThisFileInfo['mpeg']['audio']['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ // }
+ // $ThisFileInfo['mpeg']['audio']['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ // $ThisFileInfo['mpeg']['audio']['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ // }
+ // }
+ //}
+
+ return true;
+}
+
+function RecursiveFrameScanning(&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR) {
+ for ($i = 0; $i < MPEG_VALID_CHECK_FRAMES; $i++) {
+ // check next MPEG_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
+ if (($nextframetestoffset + 4) >= $ThisFileInfo['avdataend']) {
+ // end of file
+ return true;
+ }
+
+ $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
+ if (decodeMPEGaudioHeader($fd, $nextframetestoffset, $nextframetestarray, false)) {
+ if ($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($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($ThisFileInfo['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) {
+ return false;
+ }
+ }
+
+
+ // next frame is OK, get ready to check the one after that
+ if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
+ $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
+ } else {
+ $ThisFileInfo['error'] .= "\n".'Frame at offset ('.$offset.') is has an invalid frame length.';
+ return false;
+ }
+
+ } else {
+
+ // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
+ $ThisFileInfo['error'] .= "\n".'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
+
+ return false;
+ }
+ }
+ return true;
+}
+
+function FreeFormatFrameLength($fd, $offset, &$ThisFileInfo, $deepscan=false) {
+ fseek($fd, $offset, SEEK_SET);
+ $MPEGaudioData = fread($fd, 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) {
+ $ThisFileInfo['error'] .= "\n".'Cannot find next free-format synch pattern ('.PrintHexBytes($SyncPattern1).' or '.PrintHexBytes($SyncPattern2).') after offset '.$offset;
+ return false;
+ } else {
+ $ThisFileInfo['warning'] .= "\n".'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
+ $ThisFileInfo['audio']['codec'] = 'LAME';
+ $ThisFileInfo['audio']['encoder'] = 'LAME3.88';
+ $SyncPattern1 = substr($SyncPattern1, 0, 3);
+ $SyncPattern2 = substr($SyncPattern2, 0, 3);
+ }
+ }
+
+ if ($deepscan) {
+
+ $ActualFrameLengthValues = array();
+ $nextoffset = $offset + $framelength;
+ while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) {
+ fseek($fd, $nextoffset - 1, SEEK_SET);
+ $NextSyncPattern = fread($fd, 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 {
+ $ThisFileInfo['error'] .= "\n".'Did not find expected free-format sync pattern at offset '.$nextoffset;
+ return false;
+ }
+ $nextoffset += $framelength;
+ }
+ if (count($ActualFrameLengthValues) > 0) {
+ $framelength = round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues));
+ }
+ }
+ return $framelength;
+}
+
+
+function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false) {
+ // looks for synch, decodes MPEG audio header
+
+ fseek($fd, $avdataoffset, SEEK_SET);
+ $header = '';
+ $SynchSeekOffset = 0;
+
+ if (!defined('CONST_FF')) {
+ define('CONST_FF', chr(0xFF));
+ define('CONST_E0', chr(0xE0));
+ }
+
+ static $MPEGaudioVersionLookup;
+ static $MPEGaudioLayerLookup;
+ static $MPEGaudioBitrateLookup;
+ if (empty($MPEGaudioVersionLookup)) {
+ $MPEGaudioVersionLookup = MPEGaudioVersionArray();
+ $MPEGaudioLayerLookup = MPEGaudioLayerArray();
+ $MPEGaudioBitrateLookup = MPEGaudioBitrateArray();
+
+ }
+
+ $header_len = strlen($header) - round(32768 / 2);
+ while (true) {
+
+ if (($SynchSeekOffset > $header_len) && (($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) {
+
+ if ($SynchSeekOffset > 131072) {
+ // if a synch's not found within the first 128k bytes, then give up
+ $ThisFileInfo['error'] .= "\n".'could not find valid MPEG synch within the first 131072 bytes';
+ if (isset($ThisFileInfo['audio']['bitrate'])) {
+ unset($ThisFileInfo['audio']['bitrate']);
+ }
+ if (isset($ThisFileInfo['mpeg']['audio'])) {
+ unset($ThisFileInfo['mpeg']['audio']);
+ }
+ if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) {
+ unset($ThisFileInfo['mpeg']);
+ }
+ return false;
+
+ } elseif ($header .= fread($fd, 32768)) {
+
+ // great
+ $header_len = strlen($header) - round(32768 / 2);
+
+ } else {
+
+ $ThisFileInfo['error'] .= "\n".'could not find valid MPEG synch before end of file';
+ if (isset($ThisFileInfo['audio']['bitrate'])) {
+ unset($ThisFileInfo['audio']['bitrate']);
+ }
+ if (isset($ThisFileInfo['mpeg']['audio'])) {
+ unset($ThisFileInfo['mpeg']['audio']);
+ }
+ if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) {
+ unset($ThisFileInfo['mpeg']);
+ }
+ return false;
+
+ }
+ }
+
+ if (($SynchSeekOffset + 1) >= strlen($header)) {
+ $ThisFileInfo['error'] .= "\n".'could not find valid MPEG synch before end of file';
+ return false;
+ }
+
+ if (($header{$SynchSeekOffset} == CONST_FF) && ($header{($SynchSeekOffset + 1)} > CONST_E0)) { // synch detected
+
+ if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
+ $FirstFrameThisfileInfo = $ThisFileInfo;
+ $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
+ if (!decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
+ // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
+ // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
+ unset($FirstFrameThisfileInfo);
+ }
+ }
+ $dummy = $ThisFileInfo; // only overwrite real data if valid header found
+
+ if (decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
+
+ $ThisFileInfo = $dummy;
+ $ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
+ switch ($ThisFileInfo['fileformat']) {
+ case '':
+ case 'id3':
+ case 'ape':
+ case 'mp3':
+ $ThisFileInfo['fileformat'] = 'mp3';
+ $ThisFileInfo['audio']['dataformat'] = 'mp3';
+ }
+ if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
+ if (!CloseMatch($ThisFileInfo['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.
+ $ThisFileInfo = $FirstFrameThisfileInfo;
+ $ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
+ $ThisFileInfo['fileformat'] = 'mp3';
+ $ThisFileInfo['audio']['dataformat'] = 'mp3';
+ $dummy = $ThisFileInfo;
+ unset($dummy['mpeg']['audio']);
+ $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
+ $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
+ if (decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
+
+ $ThisFileInfo = $dummy;
+ $ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
+ $ThisFileInfo['warning'] .= "\n".'apparently-valid VBR header not used because could not find '.MPEG_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
+
+ } else {
+
+ $ThisFileInfo['warning'] .= "\n".'using data from VBR header even though could not find '.MPEG_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
+
+ }
+ }
+ }
+
+ if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
+ // VBR file with no VBR header
+ $BitrateHistogram = true;
+ }
+
+ if ($BitrateHistogram) {
+
+ $ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
+ $ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
+
+ if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ if ($ThisFileInfo['mpeg']['audio']['layer'] == 'III') {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32=>0, 40=>0, 48=>0, 56=>0, 64=>0, 80=>0, 96=>0, 112=>0, 128=>0, 160=>0, 192=>0, 224=>0, 256=>0, 320=>0);
+ } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 'II') {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32=>0, 48=>0, 56=>0, 64=>0, 80=>0, 96=>0, 112=>0, 128=>0, 160=>0, 192=>0, 224=>0, 256=>0, 320=>0, 384=>0);
+ } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 'I') {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32=>0, 64=>0, 96=>0, 128=>0, 160=>0, 192=>0, 224=>0, 256=>0, 288=>0, 320=>0, 352=>0, 384=>0, 416=>0, 448=>0);
+ }
+ } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 'I') {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32=>0, 48=>0, 56=>0, 64=>0, 80=>0, 96=>0, 112=>0, 128=>0, 144=>0, 160=>0, 176=>0, 192=>0, 224=>0, 256=>0);
+ } else {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8=>0, 16=>0, 24=>0, 32=>0, 40=>0, 48=>0, 56=>0, 64=>0, 80=>0, 96=>0, 112=>0, 128=>0, 144=>0, 160=>0);
+ }
+
+ $dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
+ $synchstartoffset = $ThisFileInfo['avdataoffset'];
+
+ $FastMode = false;
+ while (decodeMPEGaudioHeader($fd, $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']];
+
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
+ $ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
+ $ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
+ if (empty($dummy['mpeg']['audio']['framelength'])) {
+ $ThisFileInfo['warning'] .= "\n".'Invalid/missing framelength in histogram analysis - aborting';
+$synchstartoffset += 4;
+// return false;
+ }
+ $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
+ }
+
+ $bittotal = 0;
+ $framecounter = 0;
+ foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
+ $framecounter += $bitratecount;
+ if ($bitratevalue != 'free') {
+ $bittotal += ($bitratevalue * $bitratecount);
+ }
+ }
+ if ($framecounter == 0) {
+ $ThisFileInfo['error'] .= "\n".'Corrupt MP3 file: framecounter == zero';
+ return false;
+ }
+ $ThisFileInfo['mpeg']['audio']['frame_count'] = $framecounter;
+ $ThisFileInfo['mpeg']['audio']['bitrate'] = 1000 * ($bittotal / $framecounter);
+
+ $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
+
+
+ // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
+ $distinct_bitrates = 0;
+ foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
+ if ($bitrate_count > 0) {
+ $distinct_bitrates++;
+ }
+ }
+ if ($distinct_bitrates > 1) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
+ } else {
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
+ }
+ $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
+
+ }
+
+ break; // exit while()
+ }
+ }
+
+ $SynchSeekOffset++;
+ if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) {
+ // end of file/data
+
+ if (empty($ThisFileInfo['mpeg']['audio'])) {
+
+ $ThisFileInfo['error'] .= "\n".'could not find valid MPEG synch before end of file';
+ if (isset($ThisFileInfo['audio']['bitrate'])) {
+ unset($ThisFileInfo['audio']['bitrate']);
+ }
+ if (isset($ThisFileInfo['mpeg']['audio'])) {
+ unset($ThisFileInfo['mpeg']['audio']);
+ }
+ if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) {
+ unset($ThisFileInfo['mpeg']);
+ }
+ return false;
+
+ }
+ break;
+ }
+
+ }
+ $ThisFileInfo['audio']['bits_per_sample'] = 16;
+ $ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
+ $ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
+ $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
+ return true;
+}
+
+
+function MPEGaudioVersionArray() {
+ static $MPEGaudioVersion = array('2.5', false, '2', '1');
+ return $MPEGaudioVersion;
+}
+
+function MPEGaudioLayerArray() {
+ static $MPEGaudioLayer = array(false, 'III', 'II', 'I');
+ return $MPEGaudioLayer;
+}
+
+function MPEGaudioBitrateArray() {
+ static $MPEGaudioBitrate;
+ if (empty($MPEGaudioBitrate)) {
+ $MPEGaudioBitrate['1']['I'] = array('free', 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448);
+ $MPEGaudioBitrate['1']['II'] = array('free', 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384);
+ $MPEGaudioBitrate['1']['III'] = array('free', 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320);
+ $MPEGaudioBitrate['2']['I'] = array('free', 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256);
+ $MPEGaudioBitrate['2']['II'] = array('free', 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160);
+ $MPEGaudioBitrate['2']['III'] = $MPEGaudioBitrate['2']['II'];
+ $MPEGaudioBitrate['2.5']['I'] = $MPEGaudioBitrate['2']['I'];
+ $MPEGaudioBitrate['2.5']['II'] = $MPEGaudioBitrate['2']['II'];
+ $MPEGaudioBitrate['2.5']['III'] = $MPEGaudioBitrate['2']['III'];
+ }
+ return $MPEGaudioBitrate;
+}
+
+function MPEGaudioFrequencyArray() {
+ static $MPEGaudioFrequency;
+ if (empty($MPEGaudioFrequency)) {
+ $MPEGaudioFrequency['1'] = array(44100, 48000, 32000);
+ $MPEGaudioFrequency['2'] = array(22050, 24000, 16000);
+ $MPEGaudioFrequency['2.5'] = array(11025, 12000, 8000);
+ }
+ return $MPEGaudioFrequency;
+}
+
+function MPEGaudioChannelModeArray() {
+ static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
+ return $MPEGaudioChannelMode;
+}
+
+function MPEGaudioModeExtensionArray() {
+ static $MPEGaudioModeExtension;
+ if (empty($MPEGaudioModeExtension)) {
+ $MPEGaudioModeExtension['I'] = array('4-31', '8-31', '12-31', '16-31');
+ $MPEGaudioModeExtension['II'] = array('4-31', '8-31', '12-31', '16-31');
+ $MPEGaudioModeExtension['III'] = array('', 'IS', 'MS', 'IS+MS');
+ }
+ return $MPEGaudioModeExtension;
+}
+
+function MPEGaudioEmphasisArray() {
+ static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
+ return $MPEGaudioEmphasis;
+}
+
+
+function MPEGaudioHeaderBytesValid($head4) {
+ return MPEGaudioHeaderValid(MPEGaudioHeaderDecode($head4));
+}
+
+function MPEGaudioHeaderValid($rawarray, $echoerrors=false) {
+
+ if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
+ return false;
+ }
+
+ static $MPEGaudioVersionLookup;
+ static $MPEGaudioLayerLookup;
+ static $MPEGaudioBitrateLookup;
+ static $MPEGaudioFrequencyLookup;
+ static $MPEGaudioChannelModeLookup;
+ static $MPEGaudioModeExtensionLookup;
+ static $MPEGaudioEmphasisLookup;
+ if (empty($MPEGaudioVersionLookup)) {
+ $MPEGaudioVersionLookup = MPEGaudioVersionArray();
+ $MPEGaudioLayerLookup = MPEGaudioLayerArray();
+ $MPEGaudioBitrateLookup = MPEGaudioBitrateArray();
+ $MPEGaudioFrequencyLookup = MPEGaudioFrequencyArray();
+ $MPEGaudioChannelModeLookup = MPEGaudioChannelModeArray();
+ $MPEGaudioModeExtensionLookup = MPEGaudioModeExtensionArray();
+ $MPEGaudioEmphasisLookup = MPEGaudioEmphasisArray();
+ }
+
+ if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
+ $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
+ } else {
+ if ($echoerrors) {
+ echo "\n".'invalid Version ('.$rawarray['version'].')';
+ }
+ return false;
+ }
+ if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
+ $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
+ } else {
+ if ($echoerrors) {
+ echo "\n".'invalid Layer ('.$rawarray['layer'].')';
+ }
+ return false;
+ }
+ if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
+ if ($echoerrors) {
+ echo "\n".'invalid Bitrate ('.$rawarray['bitrate'].')';
+ }
+ if ($rawarray['bitrate'] == 15) {
+ // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
+ // let it go through here otherwise file will not be identified
+ } else {
+ return false;
+ }
+ }
+ if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
+ if ($echoerrors) {
+ echo "\n".'invalid Frequency ('.$rawarray['sample_rate'].')';
+ }
+ return false;
+ }
+ if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
+ if ($echoerrors) {
+ echo "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')';
+ }
+ return false;
+ }
+ if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
+ if ($echoerrors) {
+ echo "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')';
+ }
+ return false;
+ }
+ if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
+ if ($echoerrors) {
+ echo "\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'];
+ // $rawarray['original'];
+
+ return true;
+}
+
+function MPEGaudioHeaderDecode($Header4Bytes) {
+ // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
+ // A - Frame sync (all bits set)
+ // B - MPEG Audio version ID
+ // C - Layer description
+ // D - Protection bit
+ // E - Bitrate index
+ // F - Sampling rate frequency index
+ // G - Padding bit
+ // H - Private bit
+ // I - Channel Mode
+ // J - Mode extension (Only if Joint stereo)
+ // K - Copyright
+ // L - Original
+ // M - Emphasis
+
+ if (strlen($Header4Bytes) != 4) {
+ return false;
+ }
+
+ $MPEGrawHeader['synch'] = (BigEndian2Int(substr($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 $MPEGrawHeader;
+}
+
+function MPEGaudioFrameLength(&$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 == 'I') {
+
+ // For Layer I slot is 32 bits long
+ $FrameLengthCoefficient = 48;
+ $SlotLength = 4;
+
+ } else { // Layer II / III
+
+ // for Layer II and Layer III slot is 8 bits long.
+ $FrameLengthCoefficient = 144;
+ $SlotLength = 1;
+
+ }
+
+ } else { // MPEG-2 / MPEG-2.5
+
+ if ($layer == 'I') {
+
+ // For Layer I slot is 32 bits long
+ $FrameLengthCoefficient = 24;
+ $SlotLength = 4;
+
+ } elseif ($layer == 'II') {
+
+ // for Layer II and Layer III slot is 8 bits long.
+ $FrameLengthCoefficient = 144;
+ $SlotLength = 1;
+
+ } else { // III
+
+ // for Layer II and Layer III slot is 8 bits long.
+ $FrameLengthCoefficient = 72;
+ $SlotLength = 1;
+
+ }
+
+ }
+
+ // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
+ // http://66.96.216.160/cgi-bin/YaBB.pl?board=c&action=display&num=1018474068
+ // -> [Finding the next frame synch] on www.r3mix.net forums if the above link goes dead
+ if ($samplerate > 0) {
+ $NewFramelength = ($FrameLengthCoefficient * $bitrate * 1000) / $samplerate;
+ $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer II/III, 4 bytes for Layer I)
+ if ($padding) {
+ $NewFramelength += $SlotLength;
+ }
+ $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
+ }
+ }
+ }
+ return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
+}
+
+function LAMEvbrMethodLookup($VBRmethodID) {
+ static $LAMEvbrMethodLookup = array();
+ if (empty($LAMEvbrMethodLookup)) {
+ $LAMEvbrMethodLookup[0x00] = 'unknown';
+ $LAMEvbrMethodLookup[0x01] = 'cbr';
+ $LAMEvbrMethodLookup[0x02] = 'abr';
+ $LAMEvbrMethodLookup[0x03] = 'vbr-old / vbr-rh';
+ $LAMEvbrMethodLookup[0x04] = 'vbr-mtrh';
+ $LAMEvbrMethodLookup[0x05] = 'vbr-new / vbr-mt';
+ }
+ return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
+}
+
+function LAMEmiscStereoModeLookup($StereoModeID) {
+ static $LAMEmiscStereoModeLookup = array();
+ if (empty($LAMEmiscStereoModeLookup)) {
+ $LAMEmiscStereoModeLookup[0] = 'mono';
+ $LAMEmiscStereoModeLookup[1] = 'stereo';
+ $LAMEmiscStereoModeLookup[2] = 'dual';
+ $LAMEmiscStereoModeLookup[3] = 'joint';
+ $LAMEmiscStereoModeLookup[4] = 'forced';
+ $LAMEmiscStereoModeLookup[5] = 'auto';
+ $LAMEmiscStereoModeLookup[6] = 'intensity';
+ $LAMEmiscStereoModeLookup[7] = 'other';
+ }
+ return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
+}
+
+function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
+ static $LAMEmiscSourceSampleFrequencyLookup = array();
+ if (empty($LAMEmiscSourceSampleFrequencyLookup)) {
+ $LAMEmiscSourceSampleFrequencyLookup[0] = '<= 32 kHz';
+ $LAMEmiscSourceSampleFrequencyLookup[1] = '44.1 kHz';
+ $LAMEmiscSourceSampleFrequencyLookup[2] = '48 kHz';
+ $LAMEmiscSourceSampleFrequencyLookup[3] = '> 48kHz';
+ }
+ return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
+}
+
+function LAMEsurroundInfoLookup($SurroundInfoID) {
+ static $LAMEsurroundInfoLookup = array();
+ if (empty($LAMEsurroundInfoLookup)) {
+ $LAMEsurroundInfoLookup[0] = 'no surround info';
+ $LAMEsurroundInfoLookup[1] = 'DPL encoding';
+ $LAMEsurroundInfoLookup[2] = 'DPL2 encoding';
+ $LAMEsurroundInfoLookup[3] = 'Ambisonic encoding';
+ }
+ return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
+}
+
+for ($i = 0x00; $i <= 0xFF; $i++) {
+ $head4 = "\xFF\xFE".chr($i)."\x00";
+ $isvalid = MPEGaudioHeaderBytesValid($head4);
+ echo '<div style="color: '.($isvalid ? 'green' : 'red').';">'.str_pad(strtoupper(dechex($i)), 2, '0', STR_PAD_LEFT).' = '.htmlentities(chr($i)).' = '.($isvalid ? 'valid' : 'INVALID').'</div>';
+}
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