1 | <?php |
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2 | ///////////////////////////////////////////////////////////////// |
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3 | /// getID3() by James Heinrich <info@getid3.org> // |
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4 | // available at http://getid3.sourceforge.net // |
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5 | // or http://www.getid3.org // |
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6 | ///////////////////////////////////////////////////////////////// |
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7 | // See readme.txt for more details // |
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8 | ///////////////////////////////////////////////////////////////// |
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9 | // // |
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10 | // module.audio.nsv.php // |
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11 | // module for analyzing Nullsoft NSV files // |
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12 | // dependencies: NONE // |
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13 | // /// |
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14 | ///////////////////////////////////////////////////////////////// |
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15 | |
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16 | |
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17 | class getid3_nsv |
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18 | { |
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19 | |
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20 | function getid3_nsv(&$fd, &$ThisFileInfo) { |
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21 | |
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22 | fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); |
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23 | $NSVheader = fread($fd, 4); |
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24 | |
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25 | switch ($NSVheader) { |
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26 | case 'NSVs': |
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27 | if ($this->getNSVsHeaderFilepointer($fd, $ThisFileInfo, 0)) { |
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28 | $ThisFileInfo['fileformat'] = 'nsv'; |
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29 | $ThisFileInfo['audio']['dataformat'] = 'nsv'; |
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30 | $ThisFileInfo['video']['dataformat'] = 'nsv'; |
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31 | $ThisFileInfo['audio']['lossless'] = false; |
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32 | $ThisFileInfo['video']['lossless'] = false; |
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33 | } |
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34 | break; |
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35 | |
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36 | case 'NSVf': |
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37 | if ($this->getNSVfHeaderFilepointer($fd, $ThisFileInfo, 0)) { |
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38 | $ThisFileInfo['fileformat'] = 'nsv'; |
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39 | $ThisFileInfo['audio']['dataformat'] = 'nsv'; |
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40 | $ThisFileInfo['video']['dataformat'] = 'nsv'; |
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41 | $ThisFileInfo['audio']['lossless'] = false; |
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42 | $ThisFileInfo['video']['lossless'] = false; |
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43 | $this->getNSVsHeaderFilepointer($fd, $ThisFileInfo, $ThisFileInfo['nsv']['NSVf']['header_length']); |
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44 | } |
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45 | break; |
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46 | |
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47 | default: |
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48 | $ThisFileInfo['error'][] = 'Expecting "NSVs" or "NSVf" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$NSVheader.'"'; |
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49 | return false; |
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50 | break; |
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51 | } |
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52 | |
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53 | if (!isset($ThisFileInfo['nsv']['NSVf'])) { |
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54 | $ThisFileInfo['warning'][] = 'NSVf header not present - cannot calculate playtime or bitrate'; |
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55 | } |
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56 | |
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57 | return true; |
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58 | } |
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59 | |
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60 | function getNSVsHeaderFilepointer(&$fd, &$ThisFileInfo, $fileoffset) { |
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61 | fseek($fd, $fileoffset, SEEK_SET); |
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62 | $NSVsheader = fread($fd, 28); |
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63 | $offset = 0; |
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64 | |
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65 | $ThisFileInfo['nsv']['NSVs']['identifier'] = substr($NSVsheader, $offset, 4); |
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66 | $offset += 4; |
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67 | |
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68 | if ($ThisFileInfo['nsv']['NSVs']['identifier'] != 'NSVs') { |
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69 | $ThisFileInfo['error'][] = 'expected "NSVs" at offset ('.$fileoffset.'), found "'.$ThisFileInfo['nsv']['NSVs']['identifier'].'" instead'; |
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70 | unset($ThisFileInfo['nsv']['NSVs']); |
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71 | return false; |
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72 | } |
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73 | |
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74 | $ThisFileInfo['nsv']['NSVs']['offset'] = $fileoffset; |
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75 | |
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76 | $ThisFileInfo['nsv']['NSVs']['video_codec'] = substr($NSVsheader, $offset, 4); |
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77 | $offset += 4; |
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78 | $ThisFileInfo['nsv']['NSVs']['audio_codec'] = substr($NSVsheader, $offset, 4); |
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79 | $offset += 4; |
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80 | $ThisFileInfo['nsv']['NSVs']['resolution_x'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2)); |
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81 | $offset += 2; |
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82 | $ThisFileInfo['nsv']['NSVs']['resolution_y'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2)); |
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83 | $offset += 2; |
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84 | |
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85 | $ThisFileInfo['nsv']['NSVs']['framerate_index'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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86 | $offset += 1; |
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87 | //$ThisFileInfo['nsv']['NSVs']['unknown1b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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88 | $offset += 1; |
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89 | //$ThisFileInfo['nsv']['NSVs']['unknown1c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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90 | $offset += 1; |
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91 | //$ThisFileInfo['nsv']['NSVs']['unknown1d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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92 | $offset += 1; |
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93 | //$ThisFileInfo['nsv']['NSVs']['unknown2a'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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94 | $offset += 1; |
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95 | //$ThisFileInfo['nsv']['NSVs']['unknown2b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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96 | $offset += 1; |
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97 | //$ThisFileInfo['nsv']['NSVs']['unknown2c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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98 | $offset += 1; |
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99 | //$ThisFileInfo['nsv']['NSVs']['unknown2d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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100 | $offset += 1; |
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101 | |
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102 | switch ($ThisFileInfo['nsv']['NSVs']['audio_codec']) { |
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103 | case 'PCM ': |
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104 | $ThisFileInfo['nsv']['NSVs']['bits_channel'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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105 | $offset += 1; |
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106 | $ThisFileInfo['nsv']['NSVs']['channels'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1)); |
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107 | $offset += 1; |
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108 | $ThisFileInfo['nsv']['NSVs']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2)); |
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109 | $offset += 2; |
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110 | |
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111 | $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['nsv']['NSVs']['sample_rate']; |
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112 | break; |
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113 | |
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114 | case 'MP3 ': |
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115 | case 'NONE': |
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116 | default: |
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117 | //$ThisFileInfo['nsv']['NSVs']['unknown3'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 4)); |
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118 | $offset += 4; |
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119 | break; |
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120 | } |
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121 | |
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122 | $ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['nsv']['NSVs']['resolution_x']; |
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123 | $ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['nsv']['NSVs']['resolution_y']; |
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124 | $ThisFileInfo['nsv']['NSVs']['frame_rate'] = $this->NSVframerateLookup($ThisFileInfo['nsv']['NSVs']['framerate_index']); |
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125 | $ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['nsv']['NSVs']['frame_rate']; |
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126 | $ThisFileInfo['video']['bits_per_sample'] = 24; |
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127 | $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1; |
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128 | |
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129 | return true; |
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130 | } |
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131 | |
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132 | function getNSVfHeaderFilepointer(&$fd, &$ThisFileInfo, $fileoffset, $getTOCoffsets=false) { |
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133 | fseek($fd, $fileoffset, SEEK_SET); |
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134 | $NSVfheader = fread($fd, 28); |
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135 | $offset = 0; |
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136 | |
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137 | $ThisFileInfo['nsv']['NSVf']['identifier'] = substr($NSVfheader, $offset, 4); |
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138 | $offset += 4; |
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139 | |
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140 | if ($ThisFileInfo['nsv']['NSVf']['identifier'] != 'NSVf') { |
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141 | $ThisFileInfo['error'][] = 'expected "NSVf" at offset ('.$fileoffset.'), found "'.$ThisFileInfo['nsv']['NSVf']['identifier'].'" instead'; |
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142 | unset($ThisFileInfo['nsv']['NSVf']); |
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143 | return false; |
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144 | } |
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145 | |
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146 | $ThisFileInfo['nsv']['NSVs']['offset'] = $fileoffset; |
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147 | |
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148 | $ThisFileInfo['nsv']['NSVf']['header_length'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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149 | $offset += 4; |
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150 | $ThisFileInfo['nsv']['NSVf']['file_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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151 | $offset += 4; |
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152 | |
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153 | if ($ThisFileInfo['nsv']['NSVf']['file_size'] > $ThisFileInfo['avdataend']) { |
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154 | $ThisFileInfo['warning'][] = 'truncated file - NSVf header indicates '.$ThisFileInfo['nsv']['NSVf']['file_size'].' bytes, file actually '.$ThisFileInfo['avdataend'].' bytes'; |
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155 | } |
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156 | |
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157 | $ThisFileInfo['nsv']['NSVf']['playtime_ms'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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158 | $offset += 4; |
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159 | $ThisFileInfo['nsv']['NSVf']['meta_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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160 | $offset += 4; |
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161 | $ThisFileInfo['nsv']['NSVf']['TOC_entries_1'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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162 | $offset += 4; |
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163 | $ThisFileInfo['nsv']['NSVf']['TOC_entries_2'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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164 | $offset += 4; |
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165 | |
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166 | if ($ThisFileInfo['nsv']['NSVf']['playtime_ms'] == 0) { |
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167 | $ThisFileInfo['error'][] = 'Corrupt NSV file: NSVf.playtime_ms == zero'; |
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168 | return false; |
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169 | } |
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170 | |
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171 | $NSVfheader .= fread($fd, $ThisFileInfo['nsv']['NSVf']['meta_size'] + (4 * $ThisFileInfo['nsv']['NSVf']['TOC_entries_1']) + (4 * $ThisFileInfo['nsv']['NSVf']['TOC_entries_2'])); |
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172 | $NSVfheaderlength = strlen($NSVfheader); |
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173 | $ThisFileInfo['nsv']['NSVf']['metadata'] = substr($NSVfheader, $offset, $ThisFileInfo['nsv']['NSVf']['meta_size']); |
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174 | $offset += $ThisFileInfo['nsv']['NSVf']['meta_size']; |
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175 | |
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176 | if ($getTOCoffsets) { |
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177 | $TOCcounter = 0; |
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178 | while ($TOCcounter < $ThisFileInfo['nsv']['NSVf']['TOC_entries_1']) { |
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179 | if ($TOCcounter < $ThisFileInfo['nsv']['NSVf']['TOC_entries_1']) { |
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180 | $ThisFileInfo['nsv']['NSVf']['TOC_1'][$TOCcounter] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4)); |
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181 | $offset += 4; |
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182 | $TOCcounter++; |
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183 | } |
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184 | } |
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185 | } |
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186 | |
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187 | if (trim($ThisFileInfo['nsv']['NSVf']['metadata']) != '') { |
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188 | $ThisFileInfo['nsv']['NSVf']['metadata'] = str_replace('`', "\x01", $ThisFileInfo['nsv']['NSVf']['metadata']); |
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189 | $CommentPairArray = explode("\x01".' ', $ThisFileInfo['nsv']['NSVf']['metadata']); |
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190 | foreach ($CommentPairArray as $CommentPair) { |
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191 | if (strstr($CommentPair, '='."\x01")) { |
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192 | list($key, $value) = explode('='."\x01", $CommentPair, 2); |
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193 | $ThisFileInfo['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value)); |
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194 | } |
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195 | } |
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196 | } |
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197 | |
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198 | $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['nsv']['NSVf']['playtime_ms'] / 1000; |
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199 | $ThisFileInfo['bitrate'] = ($ThisFileInfo['nsv']['NSVf']['file_size'] * 8) / $ThisFileInfo['playtime_seconds']; |
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200 | |
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201 | return true; |
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202 | } |
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203 | |
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204 | |
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205 | function NSVframerateLookup($framerateindex) { |
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206 | if ($framerateindex <= 127) { |
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207 | return (float) $framerateindex; |
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208 | } |
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209 | |
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210 | static $NSVframerateLookup = array(); |
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211 | if (empty($NSVframerateLookup)) { |
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212 | $NSVframerateLookup[129] = (float) 29.970; |
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213 | $NSVframerateLookup[131] = (float) 23.976; |
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214 | $NSVframerateLookup[133] = (float) 14.985; |
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215 | $NSVframerateLookup[197] = (float) 59.940; |
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216 | $NSVframerateLookup[199] = (float) 47.952; |
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217 | } |
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218 | return (isset($NSVframerateLookup[$framerateindex]) ? $NSVframerateLookup[$framerateindex] : false); |
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219 | } |
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220 | |
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221 | } |
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222 | |
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223 | |
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224 | ?> |
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