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.graphic.gif.php // |
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11 | // module for analyzing GIF Image 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_gif |
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18 | { |
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19 | |
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20 | function getid3_gif(&$fd, &$ThisFileInfo) { |
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21 | $ThisFileInfo['fileformat'] = 'gif'; |
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22 | $ThisFileInfo['video']['dataformat'] = 'gif'; |
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23 | $ThisFileInfo['video']['lossless'] = true; |
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24 | $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1; |
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25 | |
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26 | fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); |
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27 | $GIFheader = fread($fd, 13); |
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28 | $offset = 0; |
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29 | |
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30 | $ThisFileInfo['gif']['header']['raw']['identifier'] = substr($GIFheader, $offset, 3); |
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31 | $offset += 3; |
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32 | |
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33 | if ($ThisFileInfo['gif']['header']['raw']['identifier'] != 'GIF') { |
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34 | $ThisFileInfo['error'][] = 'Expecting "GIF" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['gif']['header']['raw']['identifier'].'"'; |
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35 | unset($ThisFileInfo['fileformat']); |
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36 | unset($ThisFileInfo['gif']); |
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37 | return false; |
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38 | } |
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39 | |
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40 | $ThisFileInfo['gif']['header']['raw']['version'] = substr($GIFheader, $offset, 3); |
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41 | $offset += 3; |
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42 | $ThisFileInfo['gif']['header']['raw']['width'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2)); |
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43 | $offset += 2; |
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44 | $ThisFileInfo['gif']['header']['raw']['height'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2)); |
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45 | $offset += 2; |
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46 | $ThisFileInfo['gif']['header']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1)); |
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47 | $offset += 1; |
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48 | $ThisFileInfo['gif']['header']['raw']['bg_color_index'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1)); |
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49 | $offset += 1; |
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50 | $ThisFileInfo['gif']['header']['raw']['aspect_ratio'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1)); |
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51 | $offset += 1; |
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52 | |
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53 | $ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['gif']['header']['raw']['width']; |
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54 | $ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['gif']['header']['raw']['height']; |
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55 | $ThisFileInfo['gif']['version'] = $ThisFileInfo['gif']['header']['raw']['version']; |
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56 | $ThisFileInfo['gif']['header']['flags']['global_color_table'] = (bool) ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x80); |
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57 | if ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x80) { |
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58 | // Number of bits per primary color available to the original image, minus 1 |
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59 | $ThisFileInfo['gif']['header']['bits_per_pixel'] = 3 * ((($ThisFileInfo['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1); |
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60 | } else { |
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61 | $ThisFileInfo['gif']['header']['bits_per_pixel'] = 0; |
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62 | } |
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63 | $ThisFileInfo['gif']['header']['flags']['global_color_sorted'] = (bool) ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x40); |
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64 | if ($ThisFileInfo['gif']['header']['flags']['global_color_table']) { |
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65 | // the number of bytes contained in the Global Color Table. To determine that |
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66 | // actual size of the color table, raise 2 to [the value of the field + 1] |
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67 | $ThisFileInfo['gif']['header']['global_color_size'] = pow(2, ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x07) + 1); |
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68 | $ThisFileInfo['video']['bits_per_sample'] = ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x07) + 1; |
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69 | } else { |
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70 | $ThisFileInfo['gif']['header']['global_color_size'] = 0; |
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71 | } |
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72 | if ($ThisFileInfo['gif']['header']['raw']['aspect_ratio'] != 0) { |
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73 | // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64 |
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74 | $ThisFileInfo['gif']['header']['aspect_ratio'] = ($ThisFileInfo['gif']['header']['raw']['aspect_ratio'] + 15) / 64; |
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75 | } |
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76 | |
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77 | // if ($ThisFileInfo['gif']['header']['flags']['global_color_table']) { |
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78 | // $GIFcolorTable = fread($fd, 3 * $ThisFileInfo['gif']['header']['global_color_size']); |
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79 | // $offset = 0; |
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80 | // for ($i = 0; $i < $ThisFileInfo['gif']['header']['global_color_size']; $i++) { |
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81 | // $red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1)); |
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82 | // $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1)); |
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83 | // $blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1)); |
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84 | // $ThisFileInfo['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue)); |
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85 | // } |
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86 | // } |
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87 | // |
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88 | // // Image Descriptor |
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89 | // while (!feof($fd)) { |
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90 | // $NextBlockTest = fread($fd, 1); |
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91 | // switch ($NextBlockTest) { |
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92 | // |
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93 | // case ',': // ',' - Image separator character |
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94 | // |
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95 | // $ImageDescriptorData = $NextBlockTest.fread($fd, 9); |
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96 | // $ImageDescriptor = array(); |
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97 | // $ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2)); |
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98 | // $ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2)); |
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99 | // $ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2)); |
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100 | // $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2)); |
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101 | // $ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1)); |
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102 | // $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80); |
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103 | // $ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40); |
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104 | // $ThisFileInfo['gif']['image_descriptor'][] = $ImageDescriptor; |
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105 | // |
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106 | // if ($ImageDescriptor['flags']['use_local_color_map']) { |
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107 | // |
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108 | // $ThisFileInfo['warning'][] = 'This version of getID3() cannot parse local color maps for GIFs'; |
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109 | // return true; |
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110 | // |
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111 | // } |
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112 | //echo 'Start of raster data: '.ftell($fd).'<BR>'; |
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113 | // $RasterData = array(); |
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114 | // $RasterData['code_size'] = getid3_lib::LittleEndian2Int(fread($fd, 1)); |
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115 | // $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int(fread($fd, 1)); |
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116 | // $ThisFileInfo['gif']['raster_data'][count($ThisFileInfo['gif']['image_descriptor']) - 1] = $RasterData; |
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117 | // |
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118 | // $CurrentCodeSize = $RasterData['code_size'] + 1; |
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119 | // for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) { |
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120 | // $DefaultDataLookupTable[$i] = chr($i); |
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121 | // } |
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122 | // $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code |
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123 | // $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code |
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124 | // |
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125 | // |
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126 | // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize); |
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127 | // echo 'Clear Code: '.$NextValue.'<BR>'; |
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128 | // |
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129 | // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize); |
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130 | // echo 'First Color: '.$NextValue.'<BR>'; |
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131 | // |
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132 | // $Prefix = $NextValue; |
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133 | //$i = 0; |
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134 | // while ($i++ < 20) { |
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135 | // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize); |
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136 | // echo $NextValue.'<BR>'; |
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137 | // } |
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138 | //return true; |
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139 | // break; |
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140 | // |
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141 | // case '!': |
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142 | // // GIF Extension Block |
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143 | // $ExtensionBlockData = $NextBlockTest.fread($fd, 2); |
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144 | // $ExtensionBlock = array(); |
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145 | // $ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1)); |
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146 | // $ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1)); |
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147 | // $ExtensionBlock['data'] = fread($fd, $ExtensionBlock['byte_length']); |
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148 | // $ThisFileInfo['gif']['extension_blocks'][] = $ExtensionBlock; |
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149 | // break; |
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150 | // |
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151 | // case ';': |
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152 | // $ThisFileInfo['gif']['terminator_offset'] = ftell($fd) - 1; |
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153 | // // GIF Terminator |
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154 | // break; |
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155 | // |
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156 | // default: |
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157 | // break; |
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158 | // |
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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 | return true; |
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164 | } |
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165 | |
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166 | |
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167 | function GetLSBits($fd, $bits) { |
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168 | static $bitbuffer = ''; |
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169 | while (strlen($bitbuffer) < $bits) { |
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170 | //echo 'Read another byte: '.ftell($fd).'<BR>'; |
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171 | $bitbuffer = str_pad(decbin(ord(fread($fd, 1))), 8, '0', STR_PAD_LEFT).$bitbuffer; |
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172 | } |
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173 | |
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174 | $value = bindec(substr($bitbuffer, 0 - $bits)); |
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175 | $bitbuffer = substr($bitbuffer, 0, 0 - $bits); |
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176 | |
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177 | return $value; |
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178 | } |
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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 | ?> |
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