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-video.nsv.php | |
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18 | // | module for analyzing Nullsoft NSV 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-video.nsv.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_nsv 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 | $getid3->info['fileformat'] = 'nsv'; |
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34 | $getid3->info['audio']['dataformat'] = 'nsv'; |
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35 | $getid3->info['video']['dataformat'] = 'nsv'; |
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36 | $getid3->info['audio']['lossless'] = false; |
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37 | $getid3->info['video']['lossless'] = false; |
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38 | |
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39 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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40 | $nsv_header = fread($getid3->fp, 4); |
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41 | |
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42 | switch ($nsv_header) { |
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43 | |
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44 | case 'NSVs': |
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45 | $this->getNSVsHeader(); |
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46 | break; |
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47 | |
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48 | case 'NSVf': |
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49 | if ($this->getNSVfHeader()) { |
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50 | $this->getNSVsHeader($getid3->info['nsv']['NSVf']['header_length']); |
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51 | } |
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52 | break; |
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53 | |
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54 | default: |
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55 | throw new getid3_exception('Expecting "NSVs" or "NSVf" at offset '.$getid3->info['avdataoffset'].', found "'.$nsv_header.'"'); |
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56 | break; |
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57 | } |
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58 | |
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59 | if (!isset($getid3->info['nsv']['NSVf'])) { |
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60 | $getid3->warning('NSVf header not present - cannot calculate playtime or bitrate'); |
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61 | } |
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62 | |
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63 | return true; |
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64 | } |
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65 | |
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66 | |
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67 | |
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68 | private function getNSVsHeader($file_offset = 0) { |
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69 | |
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70 | $getid3 = $this->getid3; |
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71 | |
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72 | fseek($getid3->fp, $file_offset, SEEK_SET); |
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73 | $nsvs_header = fread($getid3->fp, 28); |
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74 | |
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75 | $getid3->info['nsv']['NSVs'] = array (); |
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76 | $info_nsv_NSVs = &$getid3->info['nsv']['NSVs']; |
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77 | |
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78 | $info_nsv_NSVs['identifier'] = substr($nsvs_header, 0, 4); |
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79 | if ($info_nsv_NSVs['identifier'] != 'NSVs') { |
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80 | throw new getid3_exception('expected "NSVs" at offset ('.$file_offset.'), found "'.$info_nsv_NSVs['identifier'].'" instead'); |
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81 | } |
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82 | |
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83 | $info_nsv_NSVs['offset'] = $file_offset; |
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84 | |
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85 | getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 4, |
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86 | array ( |
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87 | 'video_codec' => -4, // string |
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88 | 'audio_codec' => -4, // string |
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89 | 'resolution_x' => 2, |
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90 | 'resolution_y' => 2, |
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91 | 'framerate_index' => 1, |
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92 | ) |
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93 | ); |
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94 | |
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95 | if ($info_nsv_NSVs['audio_codec'] == 'PCM ') { |
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96 | |
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97 | getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 24, |
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98 | array ( |
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99 | 'bits_channel' => 1, |
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100 | 'channels' => 1, |
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101 | 'sample_rate' => 2 |
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102 | ) |
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103 | ); |
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104 | $getid3->info['audio']['sample_rate'] = $info_nsv_NSVs['sample_rate']; |
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105 | |
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106 | } |
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107 | |
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108 | $getid3->info['video']['resolution_x'] = $info_nsv_NSVs['resolution_x']; |
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109 | $getid3->info['video']['resolution_y'] = $info_nsv_NSVs['resolution_y']; |
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110 | $info_nsv_NSVs['frame_rate'] = getid3_nsv::NSVframerateLookup($info_nsv_NSVs['framerate_index']); |
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111 | $getid3->info['video']['frame_rate'] = $info_nsv_NSVs['frame_rate']; |
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112 | $getid3->info['video']['bits_per_sample'] = 24; |
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113 | $getid3->info['video']['pixel_aspect_ratio'] = (float)1; |
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114 | |
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115 | return true; |
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116 | } |
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117 | |
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118 | |
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119 | |
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120 | private function getNSVfHeader($file_offset = 0, $get_toc_offsets=false) { |
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121 | |
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122 | $getid3 = $this->getid3; |
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123 | |
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124 | fseek($getid3->fp, $file_offset, SEEK_SET); |
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125 | $nsvf_header = fread($getid3->fp, 28); |
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126 | |
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127 | $getid3->info['nsv']['NSVf'] = array (); |
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128 | $info_nsv_NSVf = &$getid3->info['nsv']['NSVf']; |
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129 | |
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130 | $info_nsv_NSVf['identifier'] = substr($nsvf_header, 0, 4); |
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131 | if ($info_nsv_NSVf['identifier'] != 'NSVf') { |
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132 | throw new getid3_exception('expected "NSVf" at offset ('.$file_offset.'), found "'.$info_nsv_NSVf['identifier'].'" instead'); |
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133 | } |
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134 | |
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135 | $getid3->info['nsv']['NSVs']['offset'] = $file_offset; |
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136 | |
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137 | getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVf, $nsvf_header, 4, |
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138 | array ( |
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139 | 'header_length' => 4, |
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140 | 'file_size' => 4, |
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141 | 'playtime_ms' => 4, |
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142 | 'meta_size' => 4, |
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143 | 'TOC_entries_1' => 4, |
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144 | 'TOC_entries_2' => 4 |
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145 | ) |
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146 | ); |
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147 | |
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148 | if ($info_nsv_NSVf['playtime_ms'] == 0) { |
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149 | throw new getid3_exception('Corrupt NSV file: NSVf.playtime_ms == zero'); |
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150 | } |
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151 | |
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152 | if ($info_nsv_NSVf['file_size'] > $getid3->info['avdataend']) { |
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153 | $getid3->warning('truncated file - NSVf header indicates '.$info_nsv_NSVf['file_size'].' bytes, file actually '.$getid3->info['avdataend'].' bytes'); |
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154 | } |
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155 | |
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156 | $nsvf_header .= fread($getid3->fp, $info_nsv_NSVf['meta_size'] + (4 * $info_nsv_NSVf['TOC_entries_1']) + (4 * $info_nsv_NSVf['TOC_entries_2'])); |
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157 | $nsvf_headerlength = strlen($nsvf_header); |
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158 | $info_nsv_NSVf['metadata'] = substr($nsvf_header, 28, $info_nsv_NSVf['meta_size']); |
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159 | |
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160 | $offset = 28 + $info_nsv_NSVf['meta_size']; |
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161 | if ($get_toc_offsets) { |
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162 | $toc_counter = 0; |
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163 | while ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) { |
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164 | if ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) { |
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165 | $info_nsv_NSVf['TOC_1'][$toc_counter] = getid3_lib::LittleEndian2Int(substr($nsvf_header, $offset, 4)); |
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166 | $offset += 4; |
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167 | $toc_counter++; |
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168 | } |
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169 | } |
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170 | } |
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171 | |
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172 | if (trim($info_nsv_NSVf['metadata']) != '') { |
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173 | $info_nsv_NSVf['metadata'] = str_replace('`', "\x01", $info_nsv_NSVf['metadata']); |
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174 | $comment_pair_array = explode("\x01".' ', $info_nsv_NSVf['metadata']); |
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175 | foreach ($comment_pair_array as $comment_pair) { |
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176 | if (strstr($comment_pair, '='."\x01")) { |
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177 | list($key, $value) = explode('='."\x01", $comment_pair, 2); |
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178 | $getid3->info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value)); |
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179 | } |
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180 | } |
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181 | } |
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182 | |
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183 | $getid3->info['playtime_seconds'] = $info_nsv_NSVf['playtime_ms'] / 1000; |
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184 | $getid3->info['bitrate'] = ($info_nsv_NSVf['file_size'] * 8) / $getid3->info['playtime_seconds']; |
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185 | |
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186 | return true; |
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187 | } |
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188 | |
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189 | |
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190 | |
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191 | public static function NSVframerateLookup($frame_rate_index) { |
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192 | |
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193 | if ($frame_rate_index <= 127) { |
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194 | return (float)$frame_rate_index; |
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195 | } |
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196 | |
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197 | static $lookup = array ( |
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198 | 129 => 29.970, |
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199 | 131 => 23.976, |
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200 | 133 => 14.985, |
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201 | 197 => 59.940, |
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202 | 199 => 47.952 |
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203 | ); |
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204 | return (isset($lookup[$frame_rate_index]) ? $lookup[$frame_rate_index] : false); |
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205 | } |
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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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