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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,v 1.3 2006/11/02 10:48:01 ah Exp $
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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 ?> |
