[3318] | 1 | <?php |
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| 2 | // +----------------------------------------------------------------------+ |
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| 3 | // | PHP version 5 | |
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| 4 | // +----------------------------------------------------------------------+ |
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| 5 | // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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| 6 | // +----------------------------------------------------------------------+ |
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| 7 | // | This source file is subject to version 2 of the GPL license, | |
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| 8 | // | that is bundled with this package in the file license.txt and is | |
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| 9 | // | available through the world-wide-web at the following url: | |
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| 10 | // | http://www.gnu.org/copyleft/gpl.html | |
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| 11 | // +----------------------------------------------------------------------+ |
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| 12 | // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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| 13 | // +----------------------------------------------------------------------+ |
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| 14 | // | Authors: James Heinrich <infoØgetid3*org> | |
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| 15 | // | Allan Hansen <ahØartemis*dk> | |
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| 16 | // +----------------------------------------------------------------------+ |
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| 17 | // | module.audio.mpc.php | |
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| 18 | // | Module for analyzing Musepack/MPEG+ Audio files | |
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| 19 | // | dependencies: NONE | |
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| 20 | // +----------------------------------------------------------------------+ |
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| 21 | // |
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| 22 | // $Id: module.audio.mpc.php 3318 2009-05-20 21:54:10Z vdigital $ |
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| 23 | |
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| 24 | |
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| 25 | |
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| 26 | class getid3_mpc extends getid3_handler |
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| 27 | { |
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| 28 | |
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| 29 | public function Analyze() { |
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| 30 | |
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| 31 | $getid3 = $this->getid3; |
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| 32 | |
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| 33 | // http://www.uni-jena.de/~pfk/mpp/sv8/header.html |
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| 34 | |
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| 35 | $getid3->info['fileformat'] = 'mpc'; |
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| 36 | $getid3->info['audio']['dataformat'] = 'mpc'; |
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| 37 | $getid3->info['audio']['bitrate_mode'] = 'vbr'; |
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| 38 | $getid3->info['audio']['channels'] = 2; // the format appears to be hardcoded for stereo only |
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| 39 | $getid3->info['audio']['lossless'] = false; |
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| 40 | |
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| 41 | $getid3->info['mpc']['header'] = array (); |
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| 42 | $info_mpc_header = &$getid3->info['mpc']['header']; |
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| 43 | $info_mpc_header['size'] = 28; |
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| 44 | $info_mpc_header['raw']['preamble'] = 'MP+'; // Magic bytes |
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| 45 | |
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| 46 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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| 47 | $mpc_header_data = fread($getid3->fp, 28); |
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| 48 | |
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| 49 | $stream_version_byte = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 3, 1)); |
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| 50 | $info_mpc_header['stream_major_version'] = ($stream_version_byte & 0x0F); |
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| 51 | $info_mpc_header['stream_minor_version'] = ($stream_version_byte & 0xF0) >> 4; |
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| 52 | if ($info_mpc_header['stream_major_version'] != 7) { |
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| 53 | throw new getid3_exception('Only Musepack SV7 supported'); |
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| 54 | } |
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| 55 | |
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| 56 | $info_mpc_header['frame_count'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 4, 4)); |
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| 57 | |
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| 58 | $info_mpc_header['raw']['title_peak'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 12, 2)); |
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| 59 | $info_mpc_header['raw']['title_gain'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 14, 2), true); |
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| 60 | $info_mpc_header['raw']['album_peak'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 16, 2)); |
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| 61 | $info_mpc_header['raw']['album_gain'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 18, 2), true); |
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| 62 | |
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| 63 | $info_mpc_header['raw']['not_sure_what'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 24, 3)); |
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| 64 | $info_mpc_header['raw']['encoder_version'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 27, 1)); |
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| 65 | |
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| 66 | $flags_dword1 = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 8, 4)); |
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| 67 | $flags_dword2 = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 20, 4)); |
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| 68 | |
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| 69 | $info_mpc_header['intensity_stereo'] = (bool)(($flags_dword1 & 0x80000000) >> 31); |
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| 70 | $info_mpc_header['mid_side_stereo'] = (bool)(($flags_dword1 & 0x40000000) >> 30); |
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| 71 | $info_mpc_header['max_subband'] = ($flags_dword1 & 0x3F000000) >> 24; |
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| 72 | $info_mpc_header['raw']['profile'] = ($flags_dword1 & 0x00F00000) >> 20; |
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| 73 | $info_mpc_header['begin_loud'] = (bool)(($flags_dword1 & 0x00080000) >> 19); |
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| 74 | $info_mpc_header['end_loud'] = (bool)(($flags_dword1 & 0x00040000) >> 18); |
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| 75 | $info_mpc_header['raw']['sample_rate'] = ($flags_dword1 & 0x00030000) >> 16; |
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| 76 | $info_mpc_header['max_level'] = ($flags_dword1 & 0x0000FFFF); |
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| 77 | |
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| 78 | $info_mpc_header['true_gapless'] = (bool)(($flags_dword2 & 0x80000000) >> 31); |
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| 79 | $info_mpc_header['last_frame_length'] = ($flags_dword2 & 0x7FF00000) >> 20; |
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| 80 | |
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| 81 | $info_mpc_header['profile'] = getid3_mpc::MPCprofileNameLookup($info_mpc_header['raw']['profile']); |
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| 82 | $info_mpc_header['sample_rate'] = getid3_mpc::MPCfrequencyLookup($info_mpc_header['raw']['sample_rate']); |
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| 83 | $getid3->info['audio']['sample_rate'] = $info_mpc_header['sample_rate']; |
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| 84 | $info_mpc_header['samples'] = ((($info_mpc_header['frame_count'] - 1) * 1152) + $info_mpc_header['last_frame_length']) * $getid3->info['audio']['channels']; |
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| 85 | |
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| 86 | $getid3->info['playtime_seconds'] = ($info_mpc_header['samples'] / $getid3->info['audio']['channels']) / $getid3->info['audio']['sample_rate']; |
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| 87 | |
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| 88 | $getid3->info['avdataoffset'] += $info_mpc_header['size']; |
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| 89 | |
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| 90 | $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds']; |
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| 91 | |
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| 92 | $info_mpc_header['title_peak'] = $info_mpc_header['raw']['title_peak']; |
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| 93 | $info_mpc_header['title_peak_db'] = getid3_mpc::MPCpeakDBLookup($info_mpc_header['title_peak']); |
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| 94 | if ($info_mpc_header['raw']['title_gain'] < 0) { |
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| 95 | $info_mpc_header['title_gain_db'] = (float)(32768 + $info_mpc_header['raw']['title_gain']) / -100; |
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| 96 | } |
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| 97 | else { |
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| 98 | $info_mpc_header['title_gain_db'] = (float)$info_mpc_header['raw']['title_gain'] / 100; |
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| 99 | } |
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| 100 | |
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| 101 | $info_mpc_header['album_peak'] = $info_mpc_header['raw']['album_peak']; |
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| 102 | $info_mpc_header['album_peak_db'] = getid3_mpc::MPCpeakDBLookup($info_mpc_header['album_peak']); |
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| 103 | if ($info_mpc_header['raw']['album_gain'] < 0) { |
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| 104 | $info_mpc_header['album_gain_db'] = (float)(32768 + $info_mpc_header['raw']['album_gain']) / -100; |
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| 105 | } |
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| 106 | else { |
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| 107 | $info_mpc_header['album_gain_db'] = (float)$info_mpc_header['raw']['album_gain'] / 100;; |
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| 108 | } |
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| 109 | $info_mpc_header['encoder_version'] = getid3_mpc::MPCencoderVersionLookup($info_mpc_header['raw']['encoder_version']); |
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| 110 | |
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| 111 | $getid3->info['replay_gain']['track']['adjustment'] = $info_mpc_header['title_gain_db']; |
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| 112 | $getid3->info['replay_gain']['album']['adjustment'] = $info_mpc_header['album_gain_db']; |
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| 113 | |
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| 114 | if ($info_mpc_header['title_peak'] > 0) { |
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| 115 | $getid3->info['replay_gain']['track']['peak'] = $info_mpc_header['title_peak']; |
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| 116 | } |
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| 117 | elseif (round($info_mpc_header['max_level'] * 1.18) > 0) { |
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| 118 | $getid3->info['replay_gain']['track']['peak'] = (int)(round($info_mpc_header['max_level'] * 1.18)); // why? I don't know - see mppdec.c |
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| 119 | } |
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| 120 | if ($info_mpc_header['album_peak'] > 0) { |
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| 121 | $getid3->info['replay_gain']['album']['peak'] = $info_mpc_header['album_peak']; |
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| 122 | } |
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| 123 | |
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| 124 | $getid3->info['audio']['encoder'] = $info_mpc_header['encoder_version']; |
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| 125 | $getid3->info['audio']['encoder_options'] = $info_mpc_header['profile']; |
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| 126 | |
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| 127 | return true; |
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| 128 | } |
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| 129 | |
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| 130 | |
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| 131 | |
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| 132 | public static function MPCprofileNameLookup($profileid) { |
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| 133 | |
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| 134 | static $lookup = array ( |
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| 135 | 0 => 'no profile', |
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| 136 | 1 => 'Experimental', |
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| 137 | 2 => 'unused', |
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| 138 | 3 => 'unused', |
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| 139 | 4 => 'unused', |
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| 140 | 5 => 'below Telephone (q = 0.0)', |
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| 141 | 6 => 'below Telephone (q = 1.0)', |
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| 142 | 7 => 'Telephone (q = 2.0)', |
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| 143 | 8 => 'Thumb (q = 3.0)', |
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| 144 | 9 => 'Radio (q = 4.0)', |
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| 145 | 10 => 'Standard (q = 5.0)', |
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| 146 | 11 => 'Extreme (q = 6.0)', |
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| 147 | 12 => 'Insane (q = 7.0)', |
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| 148 | 13 => 'BrainDead (q = 8.0)', |
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| 149 | 14 => 'above BrainDead (q = 9.0)', |
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| 150 | 15 => 'above BrainDead (q = 10.0)' |
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| 151 | ); |
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| 152 | return (isset($lookup[$profileid]) ? $lookup[$profileid] : 'invalid'); |
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| 153 | } |
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| 154 | |
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| 155 | |
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| 156 | |
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| 157 | public static function MPCfrequencyLookup($frequencyid) { |
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| 158 | |
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| 159 | static $lookup = array ( |
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| 160 | 0 => 44100, |
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| 161 | 1 => 48000, |
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| 162 | 2 => 37800, |
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| 163 | 3 => 32000 |
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| 164 | ); |
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| 165 | return (isset($lookup[$frequencyid]) ? $lookup[$frequencyid] : 'invalid'); |
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| 166 | } |
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| 167 | |
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| 168 | |
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| 169 | |
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| 170 | public static function MPCpeakDBLookup($int_value) { |
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| 171 | |
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| 172 | if ($int_value > 0) { |
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| 173 | return ((log10($int_value) / log10(2)) - 15) * 6; |
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| 174 | } |
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| 175 | return false; |
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| 176 | } |
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| 177 | |
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| 178 | |
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| 179 | |
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| 180 | public static function MPCencoderVersionLookup($encoder_version) { |
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| 181 | |
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| 182 | //Encoder version * 100 (106 = 1.06) |
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| 183 | //EncoderVersion % 10 == 0 Release (1.0) |
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| 184 | //EncoderVersion % 2 == 0 Beta (1.06) |
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| 185 | //EncoderVersion % 2 == 1 Alpha (1.05a...z) |
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| 186 | |
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| 187 | if ($encoder_version == 0) { |
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| 188 | // very old version, not known exactly which |
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| 189 | return 'Buschmann v1.7.0-v1.7.9 or Klemm v0.90-v1.05'; |
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| 190 | } |
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| 191 | |
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| 192 | if (($encoder_version % 10) == 0) { |
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| 193 | |
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| 194 | // release version |
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| 195 | return number_format($encoder_version / 100, 2); |
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| 196 | |
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| 197 | } elseif (($encoder_version % 2) == 0) { |
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| 198 | |
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| 199 | // beta version |
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| 200 | return number_format($encoder_version / 100, 2).' beta'; |
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| 201 | |
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| 202 | } |
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| 203 | |
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| 204 | // alpha version |
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| 205 | return number_format($encoder_version / 100, 2).' alpha'; |
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| 206 | } |
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| 207 | |
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| 208 | } |
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| 209 | |
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| 210 | |
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| 211 | ?> |
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