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Edit File : module.tag.id3v1.php \| Size : 12.41 KB
<?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at http://getid3.sourceforge.net // // or http://www.getid3.org // // also https://github.com/JamesHeinrich/getID3 // ///////////////////////////////////////////////////////////////// // See readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.tag.id3v1.php // // module for analyzing ID3v1 tags // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// class getid3_id3v1 extends getid3_handler { public function Analyze() { $info = &$this->getid3->info; if (!getid3_lib::intValueSupported($info['filesize'])) { $this->warning('Unable to check for ID3v1 because file is larger than '.round(PHP_INT_MAX / 1073741824).'GB'); return false; } $this->fseek(-256, SEEK_END); $preid3v1 = $this->fread(128); $id3v1tag = $this->fread(128); if (substr($id3v1tag, 0, 3) == 'TAG') { $info['avdataend'] = $info['filesize'] - 128; $ParsedID3v1['title'] = $this->cutfield(substr($id3v1tag, 3, 30)); $ParsedID3v1['artist'] = $this->cutfield(substr($id3v1tag, 33, 30)); $ParsedID3v1['album'] = $this->cutfield(substr($id3v1tag, 63, 30)); $ParsedID3v1['year'] = $this->cutfield(substr($id3v1tag, 93, 4)); $ParsedID3v1['comment'] = substr($id3v1tag, 97, 30); // can't remove nulls yet, track detection depends on them $ParsedID3v1['genreid'] = ord(substr($id3v1tag, 127, 1)); // If second-last byte of comment field is null and last byte of comment field is non-null // then this is ID3v1.1 and the comment field is 28 bytes long and the 30th byte is the track number if (($id3v1tag[125] === "\x00") && ($id3v1tag[126] !== "\x00")) { $ParsedID3v1['track'] = ord(substr($ParsedID3v1['comment'], 29, 1)); $ParsedID3v1['comment'] = substr($ParsedID3v1['comment'], 0, 28); } $ParsedID3v1['comment'] = $this->cutfield($ParsedID3v1['comment']); $ParsedID3v1['genre'] = $this->LookupGenreName($ParsedID3v1['genreid']); if (!empty($ParsedID3v1['genre'])) { unset($ParsedID3v1['genreid']); } if (isset($ParsedID3v1['genre']) && (empty($ParsedID3v1['genre']) \|\| ($ParsedID3v1['genre'] == 'Unknown'))) { unset($ParsedID3v1['genre']); } foreach ($ParsedID3v1 as $key => $value) { $ParsedID3v1['comments'][$key][0] = $value; } // ID3v1 encoding detection hack START // ID3v1 is defined as always using ISO-8859-1 encoding, but it is not uncommon to find files tagged with ID3v1 using Windows-1251 or other character sets // Since ID3v1 has no concept of character sets there is no certain way to know we have the correct non-ISO-8859-1 character set, but we can guess $ID3v1encoding = 'ISO-8859-1'; foreach ($ParsedID3v1['comments'] as $tag_key => $valuearray) { foreach ($valuearray as $key => $value) { if (preg_match('#^[\\x00-\\x40\\xA8\\B8\\x80-\\xFF]+$#', $value)) { foreach (array('Windows-1251', 'KOI8-R') as $id3v1_bad_encoding) { if (function_exists('mb_convert_encoding') && @mb_convert_encoding($value, $id3v1_bad_encoding, $id3v1_bad_encoding) === $value) { $ID3v1encoding = $id3v1_bad_encoding; break 3; } elseif (function_exists('iconv') && @iconv($id3v1_bad_encoding, $id3v1_bad_encoding, $value) === $value) { $ID3v1encoding = $id3v1_bad_encoding; break 3; } } } } } // ID3v1 encoding detection hack END // ID3v1 data is supposed to be padded with NULL characters, but some taggers pad with spaces $GoodFormatID3v1tag = $this->GenerateID3v1Tag( $ParsedID3v1['title'], $ParsedID3v1['artist'], $ParsedID3v1['album'], $ParsedID3v1['year'], (isset($ParsedID3v1['genre']) ? $this->LookupGenreID($ParsedID3v1['genre']) : false), $ParsedID3v1['comment'], (!empty($ParsedID3v1['track']) ? $ParsedID3v1['track'] : '')); $ParsedID3v1['padding_valid'] = true; if ($id3v1tag !== $GoodFormatID3v1tag) { $ParsedID3v1['padding_valid'] = false; $this->warning('Some ID3v1 fields do not use NULL characters for padding'); } $ParsedID3v1['tag_offset_end'] = $info['filesize']; $ParsedID3v1['tag_offset_start'] = $ParsedID3v1['tag_offset_end'] - 128; $info['id3v1'] = $ParsedID3v1; $info['id3v1']['encoding'] = $ID3v1encoding; } if (substr($preid3v1, 0, 3) == 'TAG') { // The way iTunes handles tags is, well, brain-damaged. // It completely ignores v1 if ID3v2 is present. // This goes as far as adding a new v1 tag even if there already is one // A suspected double-ID3v1 tag has been detected, but it could be that // the "TAG" identifier is a legitimate part of an APE or Lyrics3 tag if (substr($preid3v1, 96, 8) == 'APETAGEX') { // an APE tag footer was found before the last ID3v1, assume false "TAG" synch } elseif (substr($preid3v1, 119, 6) == 'LYRICS') { // a Lyrics3 tag footer was found before the last ID3v1, assume false "TAG" synch } else { // APE and Lyrics3 footers not found - assume double ID3v1 $this->warning('Duplicate ID3v1 tag detected - this has been known to happen with iTunes'); $info['avdataend'] -= 128; } } return true; } public static function cutfield($str) { return trim(substr($str, 0, strcspn($str, "\x00"))); } public static function ArrayOfGenres($allowSCMPXextended=false) { static $GenreLookup = array( 0 => 'Blues', 1 => 'Classic Rock', 2 => 'Country', 3 => 'Dance', 4 => 'Disco', 5 => 'Funk', 6 => 'Grunge', 7 => 'Hip-Hop', 8 => 'Jazz', 9 => 'Metal', 10 => 'New Age', 11 => 'Oldies', 12 => 'Other', 13 => 'Pop', 14 => 'R&B', 15 => 'Rap', 16 => 'Reggae', 17 => 'Rock', 18 => 'Techno', 19 => 'Industrial', 20 => 'Alternative', 21 => 'Ska', 22 => 'Death Metal', 23 => 'Pranks', 24 => 'Soundtrack', 25 => 'Euro-Techno', 26 => 'Ambient', 27 => 'Trip-Hop', 28 => 'Vocal', 29 => 'Jazz+Funk', 30 => 'Fusion', 31 => 'Trance', 32 => 'Classical', 33 => 'Instrumental', 34 => 'Acid', 35 => 'House', 36 => 'Game', 37 => 'Sound Clip', 38 => 'Gospel', 39 => 'Noise', 40 => 'Alt. Rock', 41 => 'Bass', 42 => 'Soul', 43 => 'Punk', 44 => 'Space', 45 => 'Meditative', 46 => 'Instrumental Pop', 47 => 'Instrumental Rock', 48 => 'Ethnic', 49 => 'Gothic', 50 => 'Darkwave', 51 => 'Techno-Industrial', 52 => 'Electronic', 53 => 'Pop-Folk', 54 => 'Eurodance', 55 => 'Dream', 56 => 'Southern Rock', 57 => 'Comedy', 58 => 'Cult', 59 => 'Gangsta Rap', 60 => 'Top 40', 61 => 'Christian Rap', 62 => 'Pop/Funk', 63 => 'Jungle', 64 => 'Native American', 65 => 'Cabaret', 66 => 'New Wave', 67 => 'Psychedelic', 68 => 'Rave', 69 => 'Showtunes', 70 => 'Trailer', 71 => 'Lo-Fi', 72 => 'Tribal', 73 => 'Acid Punk', 74 => 'Acid Jazz', 75 => 'Polka', 76 => 'Retro', 77 => 'Musical', 78 => 'Rock & Roll', 79 => 'Hard Rock', 80 => 'Folk', 81 => 'Folk/Rock', 82 => 'National Folk', 83 => 'Swing', 84 => 'Fast-Fusion', 85 => 'Bebob', 86 => 'Latin', 87 => 'Revival', 88 => 'Celtic', 89 => 'Bluegrass', 90 => 'Avantgarde', 91 => 'Gothic Rock', 92 => 'Progressive Rock', 93 => 'Psychedelic Rock', 94 => 'Symphonic Rock', 95 => 'Slow Rock', 96 => 'Big Band', 97 => 'Chorus', 98 => 'Easy Listening', 99 => 'Acoustic', 100 => 'Humour', 101 => 'Speech', 102 => 'Chanson', 103 => 'Opera', 104 => 'Chamber Music', 105 => 'Sonata', 106 => 'Symphony', 107 => 'Booty Bass', 108 => 'Primus', 109 => 'Porn Groove', 110 => 'Satire', 111 => 'Slow Jam', 112 => 'Club', 113 => 'Tango', 114 => 'Samba', 115 => 'Folklore', 116 => 'Ballad', 117 => 'Power Ballad', 118 => 'Rhythmic Soul', 119 => 'Freestyle', 120 => 'Duet', 121 => 'Punk Rock', 122 => 'Drum Solo', 123 => 'A Cappella', 124 => 'Euro-House', 125 => 'Dance Hall', 126 => 'Goa', 127 => 'Drum & Bass', 128 => 'Club-House', 129 => 'Hardcore', 130 => 'Terror', 131 => 'Indie', 132 => 'BritPop', 133 => 'Negerpunk', 134 => 'Polsk Punk', 135 => 'Beat', 136 => 'Christian Gangsta Rap', 137 => 'Heavy Metal', 138 => 'Black Metal', 139 => 'Crossover', 140 => 'Contemporary Christian', 141 => 'Christian Rock', 142 => 'Merengue', 143 => 'Salsa', 144 => 'Thrash Metal', 145 => 'Anime', 146 => 'JPop', 147 => 'Synthpop', 255 => 'Unknown', 'CR' => 'Cover', 'RX' => 'Remix' ); static $GenreLookupSCMPX = array(); if ($allowSCMPXextended && empty($GenreLookupSCMPX)) { $GenreLookupSCMPX = $GenreLookup; // http://www.geocities.co.jp/SiliconValley-Oakland/3664/alittle.html#GenreExtended // Extended ID3v1 genres invented by SCMPX // Note that 255 "Japanese Anime" conflicts with standard "Unknown" $GenreLookupSCMPX[240] = 'Sacred'; $GenreLookupSCMPX[241] = 'Northern Europe'; $GenreLookupSCMPX[242] = 'Irish & Scottish'; $GenreLookupSCMPX[243] = 'Scotland'; $GenreLookupSCMPX[244] = 'Ethnic Europe'; $GenreLookupSCMPX[245] = 'Enka'; $GenreLookupSCMPX[246] = 'Children\'s Song'; $GenreLookupSCMPX[247] = 'Japanese Sky'; $GenreLookupSCMPX[248] = 'Japanese Heavy Rock'; $GenreLookupSCMPX[249] = 'Japanese Doom Rock'; $GenreLookupSCMPX[250] = 'Japanese J-POP'; $GenreLookupSCMPX[251] = 'Japanese Seiyu'; $GenreLookupSCMPX[252] = 'Japanese Ambient Techno'; $GenreLookupSCMPX[253] = 'Japanese Moemoe'; $GenreLookupSCMPX[254] = 'Japanese Tokusatsu'; //$GenreLookupSCMPX[255] = 'Japanese Anime'; } return ($allowSCMPXextended ? $GenreLookupSCMPX : $GenreLookup); } public static function LookupGenreName($genreid, $allowSCMPXextended=true) { switch ($genreid) { case 'RX': case 'CR': break; default: if (!is_numeric($genreid)) { return false; } $genreid = intval($genreid); // to handle 3 or '3' or '03' break; } $GenreLookup = self::ArrayOfGenres($allowSCMPXextended); return (isset($GenreLookup[$genreid]) ? $GenreLookup[$genreid] : false); } public static function LookupGenreID($genre, $allowSCMPXextended=false) { $GenreLookup = self::ArrayOfGenres($allowSCMPXextended); $LowerCaseNoSpaceSearchTerm = strtolower(str_replace(' ', '', $genre)); foreach ($GenreLookup as $key => $value) { if (strtolower(str_replace(' ', '', $value)) == $LowerCaseNoSpaceSearchTerm) { return $key; } } return false; } public static function StandardiseID3v1GenreName($OriginalGenre) { if (($GenreID = self::LookupGenreID($OriginalGenre)) !== false) { return self::LookupGenreName($GenreID); } return $OriginalGenre; } public static function GenerateID3v1Tag($title, $artist, $album, $year, $genreid, $comment, $track='') { $ID3v1Tag = 'TAG'; $ID3v1Tag .= str_pad(trim(substr($title, 0, 30)), 30, "\x00", STR_PAD_RIGHT); $ID3v1Tag .= str_pad(trim(substr($artist, 0, 30)), 30, "\x00", STR_PAD_RIGHT); $ID3v1Tag .= str_pad(trim(substr($album, 0, 30)), 30, "\x00", STR_PAD_RIGHT); $ID3v1Tag .= str_pad(trim(substr($year, 0, 4)), 4, "\x00", STR_PAD_LEFT); if (!empty($track) && ($track > 0) && ($track <= 255)) { $ID3v1Tag .= str_pad(trim(substr($comment, 0, 28)), 28, "\x00", STR_PAD_RIGHT); $ID3v1Tag .= "\x00"; if (gettype($track) == 'string') { $track = (int) $track; } $ID3v1Tag .= chr($track); } else { $ID3v1Tag .= str_pad(trim(substr($comment, 0, 30)), 30, "\x00", STR_PAD_RIGHT); } if (($genreid < 0) \|\| ($genreid > 147)) { $genreid = 255; // 'unknown' genre } switch (gettype($genreid)) { case 'string': case 'integer': $ID3v1Tag .= chr(intval($genreid)); break; default: $ID3v1Tag .= chr(255); // 'unknown' genre break; } return $ID3v1Tag; } } Back

Edit File : module.tag.id3v1.php | Size : 12.41 KB

<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.tag.id3v1.php                                        //
// module for analyzing ID3v1 tags                             //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

class getid3_id3v1 extends getid3_handler
{

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

if (!getid3_lib::intValueSupported($info['filesize'])) {
			$this->warning('Unable to check for ID3v1 because file is larger than '.round(PHP_INT_MAX / 1073741824).'GB');
			return false;
		}

$this->fseek(-256, SEEK_END);
		$preid3v1 = $this->fread(128);
		$id3v1tag = $this->fread(128);

if (substr($id3v1tag, 0, 3) == 'TAG') {

$info['avdataend'] = $info['filesize'] - 128;

$ParsedID3v1['title']   = $this->cutfield(substr($id3v1tag,   3, 30));
			$ParsedID3v1['artist']  = $this->cutfield(substr($id3v1tag,  33, 30));
			$ParsedID3v1['album']   = $this->cutfield(substr($id3v1tag,  63, 30));
			$ParsedID3v1['year']    = $this->cutfield(substr($id3v1tag,  93,  4));
			$ParsedID3v1['comment'] =                 substr($id3v1tag,  97, 30);  // can't remove nulls yet, track detection depends on them
			$ParsedID3v1['genreid'] =             ord(substr($id3v1tag, 127,  1));

// If second-last byte of comment field is null and last byte of comment field is non-null
			// then this is ID3v1.1 and the comment field is 28 bytes long and the 30th byte is the track number
			if (($id3v1tag[125] === "\x00") && ($id3v1tag[126] !== "\x00")) {
				$ParsedID3v1['track']   = ord(substr($ParsedID3v1['comment'], 29,  1));
				$ParsedID3v1['comment'] =     substr($ParsedID3v1['comment'],  0, 28);
			}
			$ParsedID3v1['comment'] = $this->cutfield($ParsedID3v1['comment']);

$ParsedID3v1['genre'] = $this->LookupGenreName($ParsedID3v1['genreid']);
			if (!empty($ParsedID3v1['genre'])) {
				unset($ParsedID3v1['genreid']);
			}
			if (isset($ParsedID3v1['genre']) && (empty($ParsedID3v1['genre']) || ($ParsedID3v1['genre'] == 'Unknown'))) {
				unset($ParsedID3v1['genre']);
			}

foreach ($ParsedID3v1 as $key => $value) {
				$ParsedID3v1['comments'][$key][0] = $value;
			}
			// ID3v1 encoding detection hack START
			// ID3v1 is defined as always using ISO-8859-1 encoding, but it is not uncommon to find files tagged with ID3v1 using Windows-1251 or other character sets
			// Since ID3v1 has no concept of character sets there is no certain way to know we have the correct non-ISO-8859-1 character set, but we can guess
			$ID3v1encoding = 'ISO-8859-1';
			foreach ($ParsedID3v1['comments'] as $tag_key => $valuearray) {
				foreach ($valuearray as $key => $value) {
					if (preg_match('#^[\\x00-\\x40\\xA8\\B8\\x80-\\xFF]+$#', $value)) {
						foreach (array('Windows-1251', 'KOI8-R') as $id3v1_bad_encoding) {
							if (function_exists('mb_convert_encoding') && @mb_convert_encoding($value, $id3v1_bad_encoding, $id3v1_bad_encoding) === $value) {
								$ID3v1encoding = $id3v1_bad_encoding;
								break 3;
							} elseif (function_exists('iconv') && @iconv($id3v1_bad_encoding, $id3v1_bad_encoding, $value) === $value) {
								$ID3v1encoding = $id3v1_bad_encoding;
								break 3;
							}
						}
					}
				}
			}
			// ID3v1 encoding detection hack END

// ID3v1 data is supposed to be padded with NULL characters, but some taggers pad with spaces
			$GoodFormatID3v1tag = $this->GenerateID3v1Tag(
											$ParsedID3v1['title'],
											$ParsedID3v1['artist'],
											$ParsedID3v1['album'],
											$ParsedID3v1['year'],
											(isset($ParsedID3v1['genre']) ? $this->LookupGenreID($ParsedID3v1['genre']) : false),
											$ParsedID3v1['comment'],
											(!empty($ParsedID3v1['track']) ? $ParsedID3v1['track'] : ''));
			$ParsedID3v1['padding_valid'] = true;
			if ($id3v1tag !== $GoodFormatID3v1tag) {
				$ParsedID3v1['padding_valid'] = false;
				$this->warning('Some ID3v1 fields do not use NULL characters for padding');
			}

$ParsedID3v1['tag_offset_end']   = $info['filesize'];
			$ParsedID3v1['tag_offset_start'] = $ParsedID3v1['tag_offset_end'] - 128;

$info['id3v1'] = $ParsedID3v1;
			$info['id3v1']['encoding'] = $ID3v1encoding;
		}

if (substr($preid3v1, 0, 3) == 'TAG') {
			// The way iTunes handles tags is, well, brain-damaged.
			// It completely ignores v1 if ID3v2 is present.
			// This goes as far as adding a new v1 tag *even if there already is one*

// A suspected double-ID3v1 tag has been detected, but it could be that
			// the "TAG" identifier is a legitimate part of an APE or Lyrics3 tag
			if (substr($preid3v1, 96, 8) == 'APETAGEX') {
				// an APE tag footer was found before the last ID3v1, assume false "TAG" synch
			} elseif (substr($preid3v1, 119, 6) == 'LYRICS') {
				// a Lyrics3 tag footer was found before the last ID3v1, assume false "TAG" synch
			} else {
				// APE and Lyrics3 footers not found - assume double ID3v1
				$this->warning('Duplicate ID3v1 tag detected - this has been known to happen with iTunes');
				$info['avdataend'] -= 128;
			}
		}

return true;
	}

public static function cutfield($str) {
		return trim(substr($str, 0, strcspn($str, "\x00")));
	}

public static function ArrayOfGenres($allowSCMPXextended=false) {
		static $GenreLookup = array(
			0    => 'Blues',
			1    => 'Classic Rock',
			2    => 'Country',
			3    => 'Dance',
			4    => 'Disco',
			5    => 'Funk',
			6    => 'Grunge',
			7    => 'Hip-Hop',
			8    => 'Jazz',
			9    => 'Metal',
			10   => 'New Age',
			11   => 'Oldies',
			12   => 'Other',
			13   => 'Pop',
			14   => 'R&B',
			15   => 'Rap',
			16   => 'Reggae',
			17   => 'Rock',
			18   => 'Techno',
			19   => 'Industrial',
			20   => 'Alternative',
			21   => 'Ska',
			22   => 'Death Metal',
			23   => 'Pranks',
			24   => 'Soundtrack',
			25   => 'Euro-Techno',
			26   => 'Ambient',
			27   => 'Trip-Hop',
			28   => 'Vocal',
			29   => 'Jazz+Funk',
			30   => 'Fusion',
			31   => 'Trance',
			32   => 'Classical',
			33   => 'Instrumental',
			34   => 'Acid',
			35   => 'House',
			36   => 'Game',
			37   => 'Sound Clip',
			38   => 'Gospel',
			39   => 'Noise',
			40   => 'Alt. Rock',
			41   => 'Bass',
			42   => 'Soul',
			43   => 'Punk',
			44   => 'Space',
			45   => 'Meditative',
			46   => 'Instrumental Pop',
			47   => 'Instrumental Rock',
			48   => 'Ethnic',
			49   => 'Gothic',
			50   => 'Darkwave',
			51   => 'Techno-Industrial',
			52   => 'Electronic',
			53   => 'Pop-Folk',
			54   => 'Eurodance',
			55   => 'Dream',
			56   => 'Southern Rock',
			57   => 'Comedy',
			58   => 'Cult',
			59   => 'Gangsta Rap',
			60   => 'Top 40',
			61   => 'Christian Rap',
			62   => 'Pop/Funk',
			63   => 'Jungle',
			64   => 'Native American',
			65   => 'Cabaret',
			66   => 'New Wave',
			67   => 'Psychedelic',
			68   => 'Rave',
			69   => 'Showtunes',
			70   => 'Trailer',
			71   => 'Lo-Fi',
			72   => 'Tribal',
			73   => 'Acid Punk',
			74   => 'Acid Jazz',
			75   => 'Polka',
			76   => 'Retro',
			77   => 'Musical',
			78   => 'Rock & Roll',
			79   => 'Hard Rock',
			80   => 'Folk',
			81   => 'Folk/Rock',
			82   => 'National Folk',
			83   => 'Swing',
			84   => 'Fast-Fusion',
			85   => 'Bebob',
			86   => 'Latin',
			87   => 'Revival',
			88   => 'Celtic',
			89   => 'Bluegrass',
			90   => 'Avantgarde',
			91   => 'Gothic Rock',
			92   => 'Progressive Rock',
			93   => 'Psychedelic Rock',
			94   => 'Symphonic Rock',
			95   => 'Slow Rock',
			96   => 'Big Band',
			97   => 'Chorus',
			98   => 'Easy Listening',
			99   => 'Acoustic',
			100  => 'Humour',
			101  => 'Speech',
			102  => 'Chanson',
			103  => 'Opera',
			104  => 'Chamber Music',
			105  => 'Sonata',
			106  => 'Symphony',
			107  => 'Booty Bass',
			108  => 'Primus',
			109  => 'Porn Groove',
			110  => 'Satire',
			111  => 'Slow Jam',
			112  => 'Club',
			113  => 'Tango',
			114  => 'Samba',
			115  => 'Folklore',
			116  => 'Ballad',
			117  => 'Power Ballad',
			118  => 'Rhythmic Soul',
			119  => 'Freestyle',
			120  => 'Duet',
			121  => 'Punk Rock',
			122  => 'Drum Solo',
			123  => 'A Cappella',
			124  => 'Euro-House',
			125  => 'Dance Hall',
			126  => 'Goa',
			127  => 'Drum & Bass',
			128  => 'Club-House',
			129  => 'Hardcore',
			130  => 'Terror',
			131  => 'Indie',
			132  => 'BritPop',
			133  => 'Negerpunk',
			134  => 'Polsk Punk',
			135  => 'Beat',
			136  => 'Christian Gangsta Rap',
			137  => 'Heavy Metal',
			138  => 'Black Metal',
			139  => 'Crossover',
			140  => 'Contemporary Christian',
			141  => 'Christian Rock',
			142  => 'Merengue',
			143  => 'Salsa',
			144  => 'Thrash Metal',
			145  => 'Anime',
			146  => 'JPop',
			147  => 'Synthpop',

255  => 'Unknown',

'CR' => 'Cover',
			'RX' => 'Remix'
		);

static $GenreLookupSCMPX = array();
		if ($allowSCMPXextended && empty($GenreLookupSCMPX)) {
			$GenreLookupSCMPX = $GenreLookup;
			// http://www.geocities.co.jp/SiliconValley-Oakland/3664/alittle.html#GenreExtended
			// Extended ID3v1 genres invented by SCMPX
			// Note that 255 "Japanese Anime" conflicts with standard "Unknown"
			$GenreLookupSCMPX[240] = 'Sacred';
			$GenreLookupSCMPX[241] = 'Northern Europe';
			$GenreLookupSCMPX[242] = 'Irish & Scottish';
			$GenreLookupSCMPX[243] = 'Scotland';
			$GenreLookupSCMPX[244] = 'Ethnic Europe';
			$GenreLookupSCMPX[245] = 'Enka';
			$GenreLookupSCMPX[246] = 'Children\'s Song';
			$GenreLookupSCMPX[247] = 'Japanese Sky';
			$GenreLookupSCMPX[248] = 'Japanese Heavy Rock';
			$GenreLookupSCMPX[249] = 'Japanese Doom Rock';
			$GenreLookupSCMPX[250] = 'Japanese J-POP';
			$GenreLookupSCMPX[251] = 'Japanese Seiyu';
			$GenreLookupSCMPX[252] = 'Japanese Ambient Techno';
			$GenreLookupSCMPX[253] = 'Japanese Moemoe';
			$GenreLookupSCMPX[254] = 'Japanese Tokusatsu';
			//$GenreLookupSCMPX[255] = 'Japanese Anime';
		}

return ($allowSCMPXextended ? $GenreLookupSCMPX : $GenreLookup);
	}

public static function LookupGenreName($genreid, $allowSCMPXextended=true) {
		switch ($genreid) {
			case 'RX':
			case 'CR':
				break;
			default:
				if (!is_numeric($genreid)) {
					return false;
				}
				$genreid = intval($genreid); // to handle 3 or '3' or '03'
				break;
		}
		$GenreLookup = self::ArrayOfGenres($allowSCMPXextended);
		return (isset($GenreLookup[$genreid]) ? $GenreLookup[$genreid] : false);
	}

public static function LookupGenreID($genre, $allowSCMPXextended=false) {
		$GenreLookup = self::ArrayOfGenres($allowSCMPXextended);
		$LowerCaseNoSpaceSearchTerm = strtolower(str_replace(' ', '', $genre));
		foreach ($GenreLookup as $key => $value) {
			if (strtolower(str_replace(' ', '', $value)) == $LowerCaseNoSpaceSearchTerm) {
				return $key;
			}
		}
		return false;
	}

public static function StandardiseID3v1GenreName($OriginalGenre) {
		if (($GenreID = self::LookupGenreID($OriginalGenre)) !== false) {
			return self::LookupGenreName($GenreID);
		}
		return $OriginalGenre;
	}

public static function GenerateID3v1Tag($title, $artist, $album, $year, $genreid, $comment, $track='') {
		$ID3v1Tag  = 'TAG';
		$ID3v1Tag .= str_pad(trim(substr($title,  0, 30)), 30, "\x00", STR_PAD_RIGHT);
		$ID3v1Tag .= str_pad(trim(substr($artist, 0, 30)), 30, "\x00", STR_PAD_RIGHT);
		$ID3v1Tag .= str_pad(trim(substr($album,  0, 30)), 30, "\x00", STR_PAD_RIGHT);
		$ID3v1Tag .= str_pad(trim(substr($year,   0,  4)),  4, "\x00", STR_PAD_LEFT);
		if (!empty($track) && ($track > 0) && ($track <= 255)) {
			$ID3v1Tag .= str_pad(trim(substr($comment, 0, 28)), 28, "\x00", STR_PAD_RIGHT);
			$ID3v1Tag .= "\x00";
			if (gettype($track) == 'string') {
				$track = (int) $track;
			}
			$ID3v1Tag .= chr($track);
		} else {
			$ID3v1Tag .= str_pad(trim(substr($comment, 0, 30)), 30, "\x00", STR_PAD_RIGHT);
		}
		if (($genreid < 0) || ($genreid > 147)) {
			$genreid = 255; // 'unknown' genre
		}
		switch (gettype($genreid)) {
			case 'string':
			case 'integer':
				$ID3v1Tag .= chr(intval($genreid));
				break;
			default:
				$ID3v1Tag .= chr(255); // 'unknown' genre
				break;
		}

return $ID3v1Tag;
	}

}

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