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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