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.vqf.php | |
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18 | // | Module for analyzing VQF 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.vqf.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_vqf 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 | // based loosely on code from TTwinVQ by Jurgen Faul <jfaulØgmx*de> |
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34 | // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html |
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35 | |
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36 | $getid3->info['fileformat'] = 'vqf'; |
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37 | $getid3->info['audio']['dataformat'] = 'vqf'; |
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38 | $getid3->info['audio']['bitrate_mode'] = 'cbr'; |
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39 | $getid3->info['audio']['lossless'] = false; |
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40 | |
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41 | // Shortcuts |
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42 | $getid3->info['vqf']['raw'] = array (); |
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43 | $info_vqf = &$getid3->info['vqf']; |
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44 | $info_vqf_raw = &$info_vqf['raw']; |
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45 | |
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46 | // Get header |
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47 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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48 | $vqf_header_data = fread($getid3->fp, 16); |
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49 | |
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50 | $info_vqf_raw['header_tag'] = 'TWIN'; // Magic bytes |
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51 | $info_vqf_raw['version'] = substr($vqf_header_data, 4, 8); |
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52 | $info_vqf_raw['size'] = getid3_lib::BigEndian2Int(substr($vqf_header_data, 12, 4)); |
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53 | |
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54 | while (ftell($getid3->fp) < $getid3->info['avdataend']) { |
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55 | |
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56 | $chunk_base_offset = ftell($getid3->fp); |
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57 | $chunk_data = fread($getid3->fp, 8); |
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58 | $chunk_name = substr($chunk_data, 0, 4); |
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59 | |
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60 | if ($chunk_name == 'DATA') { |
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61 | $getid3->info['avdataoffset'] = $chunk_base_offset; |
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62 | break; |
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63 | } |
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64 | |
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65 | $chunk_size = getid3_lib::BigEndian2Int(substr($chunk_data, 4, 4)); |
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66 | if ($chunk_size > ($getid3->info['avdataend'] - ftell($getid3->fp))) { |
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67 | throw new getid3_exception('Invalid chunk size ('.$chunk_size.') for chunk "'.$chunk_name.'" at offset 8.'); |
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68 | } |
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69 | if ($chunk_size > 0) { |
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70 | $chunk_data .= fread($getid3->fp, $chunk_size); |
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71 | } |
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72 | |
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73 | switch ($chunk_name) { |
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74 | |
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75 | case 'COMM': |
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76 | $info_vqf['COMM'] = array (); |
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77 | getid3_lib::ReadSequence('BigEndian2Int', $info_vqf['COMM'], $chunk_data, 8, |
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78 | array ( |
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79 | 'channel_mode' => 4, |
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80 | 'bitrate' => 4, |
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81 | 'sample_rate' => 4, |
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82 | 'security_level' => 4 |
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83 | ) |
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84 | ); |
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85 | |
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86 | $getid3->info['audio']['channels'] = $info_vqf['COMM']['channel_mode'] + 1; |
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87 | $getid3->info['audio']['sample_rate'] = getid3_vqf::VQFchannelFrequencyLookup($info_vqf['COMM']['sample_rate']); |
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88 | $getid3->info['audio']['bitrate'] = $info_vqf['COMM']['bitrate'] * 1000; |
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89 | $getid3->info['audio']['encoder_options'] = 'CBR' . ceil($getid3->info['audio']['bitrate']/1000); |
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90 | |
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91 | if ($getid3->info['audio']['bitrate'] == 0) { |
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92 | throw new getid3_exception('Corrupt VQF file: bitrate_audio == zero'); |
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93 | } |
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94 | break; |
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95 | |
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96 | case 'NAME': |
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97 | case 'AUTH': |
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98 | case '(c) ': |
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99 | case 'FILE': |
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100 | case 'COMT': |
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101 | case 'ALBM': |
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102 | $info_vqf['comments'][getid3_vqf::VQFcommentNiceNameLookup($chunk_name)][] = trim(substr($chunk_data, 8)); |
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103 | break; |
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104 | |
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105 | case 'DSIZ': |
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106 | $info_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($chunk_data, 8, 4)); |
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107 | break; |
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108 | |
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109 | default: |
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110 | $getid3->warning('Unhandled chunk type "'.$chunk_name.'" at offset 8'); |
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111 | break; |
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112 | } |
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113 | } |
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114 | |
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115 | $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate']; |
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116 | |
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117 | if (isset($info_vqf['DSIZ']) && (($info_vqf['DSIZ'] != ($getid3->info['avdataend'] - $getid3->info['avdataoffset'] - strlen('DATA'))))) { |
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118 | switch ($info_vqf['DSIZ']) { |
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119 | case 0: |
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120 | case 1: |
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121 | $getid3->warning('Invalid DSIZ value "'.$info_vqf['DSIZ'].'". This is known to happen with VQF files encoded by Ahead Nero, and seems to be its way of saying this is TwinVQF v'.($info_vqf['DSIZ'] + 1).'.0'); |
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122 | $getid3->info['audio']['encoder'] = 'Ahead Nero'; |
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123 | break; |
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124 | |
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125 | default: |
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126 | $getid3->warning('Probable corrupted file - should be '.$info_vqf['DSIZ'].' bytes, actually '.($getid3->info['avdataend'] - $getid3->info['avdataoffset'] - strlen('DATA'))); |
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127 | break; |
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128 | } |
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129 | } |
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130 | |
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131 | return true; |
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132 | } |
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133 | |
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134 | |
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135 | |
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136 | public static function VQFchannelFrequencyLookup($frequencyid) { |
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137 | |
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138 | static $lookup = array ( |
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139 | 11 => 11025, |
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140 | 22 => 22050, |
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141 | 44 => 44100 |
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142 | ); |
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143 | return (isset($lookup[$frequencyid]) ? $lookup[$frequencyid] : $frequencyid * 1000); |
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144 | } |
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145 | |
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146 | |
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147 | |
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148 | public static function VQFcommentNiceNameLookup($shortname) { |
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149 | |
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150 | static $lookup = array ( |
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151 | 'NAME' => 'title', |
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152 | 'AUTH' => 'artist', |
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153 | '(c) ' => 'copyright', |
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154 | 'FILE' => 'filename', |
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155 | 'COMT' => 'comment', |
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156 | 'ALBM' => 'album' |
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157 | ); |
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158 | return (isset($lookup[$shortname]) ? $lookup[$shortname] : $shortname); |
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159 | } |
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160 | |
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161 | } |
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162 | |
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163 | |
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164 | ?> |
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