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.swf.php | |
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18 | // | module for analyzing Macromedia Shockwave Flash files. | |
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19 | // | dependencies: zlib support in PHP | |
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20 | // +----------------------------------------------------------------------+ |
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21 | // |
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22 | // $Id: module.audio-video.swf.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_swf 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'] = 'swf'; |
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34 | $getid3->info['video']['dataformat'] = 'swf'; |
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35 | |
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36 | // http://www.openswf.org/spec/SWFfileformat.html |
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37 | |
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38 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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39 | |
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40 | $swf_file_data = fread($getid3->fp, $getid3->info['avdataend'] - $getid3->info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data |
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41 | |
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42 | $getid3->info['swf']['header']['signature'] = substr($swf_file_data, 0, 3); |
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43 | switch ($getid3->info['swf']['header']['signature']) { |
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44 | |
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45 | case 'FWS': |
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46 | $getid3->info['swf']['header']['compressed'] = false; |
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47 | break; |
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48 | |
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49 | case 'CWS': |
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50 | $getid3->info['swf']['header']['compressed'] = true; |
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51 | break; |
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52 | |
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53 | default: |
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54 | throw new getid3_exception('Expecting "FWS" or "CWS" at offset '.$getid3->info['avdataoffset'].', found "'.$getid3->info['swf']['header']['signature'].'"'); |
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55 | } |
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56 | $getid3->info['swf']['header']['version'] = getid3_lib::LittleEndian2Int($swf_file_data{3}); |
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57 | $getid3->info['swf']['header']['length'] = getid3_lib::LittleEndian2Int(substr($swf_file_data, 4, 4)); |
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58 | |
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59 | if (!function_exists('gzuncompress')) { |
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60 | throw new getid3_exception('getid3_swf requires --zlib support in PHP.'); |
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61 | } |
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62 | |
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63 | if ($getid3->info['swf']['header']['compressed']) { |
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64 | |
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65 | if ($uncompressed_file_data = @gzuncompress(substr($swf_file_data, 8))) { |
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66 | $swf_file_data = substr($swf_file_data, 0, 8).$uncompressed_file_data; |
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67 | |
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68 | } else { |
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69 | throw new getid3_exception('Error decompressing compressed SWF data'); |
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70 | } |
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71 | |
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72 | } |
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73 | |
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74 | $frame_size_bits_per_value = (ord(substr($swf_file_data, 8, 1)) & 0xF8) >> 3; |
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75 | $frame_size_data_length = ceil((5 + (4 * $frame_size_bits_per_value)) / 8); |
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76 | $frame_size_data_string = str_pad(decbin(ord($swf_file_data[8]) & 0x07), 3, '0', STR_PAD_LEFT); |
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77 | |
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78 | for ($i = 1; $i < $frame_size_data_length; $i++) { |
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79 | $frame_size_data_string .= str_pad(decbin(ord(substr($swf_file_data, 8 + $i, 1))), 8, '0', STR_PAD_LEFT); |
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80 | } |
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81 | |
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82 | list($x1, $x2, $y1, $y2) = explode("\n", wordwrap($frame_size_data_string, $frame_size_bits_per_value, "\n", 1)); |
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83 | $getid3->info['swf']['header']['frame_width'] = bindec($x2); |
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84 | $getid3->info['swf']['header']['frame_height'] = bindec($y2); |
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85 | |
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86 | // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm |
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87 | // Next in the header is the frame rate, which is kind of weird. |
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88 | // It is supposed to be stored as a 16bit integer, but the first byte |
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89 | // (or last depending on how you look at it) is completely ignored. |
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90 | // Example: 0x000C -> 0x0C -> 12 So the frame rate is 12 fps. |
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91 | |
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92 | // Byte at (8 + $frame_size_data_length) is always zero and ignored |
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93 | $getid3->info['swf']['header']['frame_rate'] = getid3_lib::LittleEndian2Int($swf_file_data[9 + $frame_size_data_length]); |
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94 | $getid3->info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($swf_file_data, 10 + $frame_size_data_length, 2)); |
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95 | |
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96 | $getid3->info['video']['frame_rate'] = $getid3->info['swf']['header']['frame_rate']; |
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97 | $getid3->info['video']['resolution_x'] = intval(round($getid3->info['swf']['header']['frame_width'] / 20)); |
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98 | $getid3->info['video']['resolution_y'] = intval(round($getid3->info['swf']['header']['frame_height'] / 20)); |
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99 | $getid3->info['video']['pixel_aspect_ratio'] = (float)1; |
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100 | |
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101 | if (($getid3->info['swf']['header']['frame_count'] > 0) && ($getid3->info['swf']['header']['frame_rate'] > 0)) { |
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102 | $getid3->info['playtime_seconds'] = $getid3->info['swf']['header']['frame_count'] / $getid3->info['swf']['header']['frame_rate']; |
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103 | } |
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104 | |
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105 | |
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106 | // SWF tags |
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107 | |
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108 | $current_offset = 12 + $frame_size_data_length; |
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109 | $swf_data_length = strlen($swf_file_data); |
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110 | |
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111 | while ($current_offset < $swf_data_length) { |
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112 | |
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113 | $tag_ID_tag_length = getid3_lib::LittleEndian2Int(substr($swf_file_data, $current_offset, 2)); |
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114 | $tag_ID = ($tag_ID_tag_length & 0xFFFC) >> 6; |
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115 | $tag_length = ($tag_ID_tag_length & 0x003F); |
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116 | $current_offset += 2; |
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117 | if ($tag_length == 0x3F) { |
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118 | $tag_length = getid3_lib::LittleEndian2Int(substr($swf_file_data, $current_offset, 4)); |
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119 | $current_offset += 4; |
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120 | } |
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121 | |
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122 | unset($tag_data); |
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123 | $tag_data['offset'] = $current_offset; |
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124 | $tag_data['size'] = $tag_length; |
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125 | $tag_data['id'] = $tag_ID; |
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126 | $tag_data['data'] = substr($swf_file_data, $current_offset, $tag_length); |
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127 | switch ($tag_ID) { |
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128 | |
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129 | case 0: // end of movie |
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130 | break 2; |
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131 | |
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132 | case 9: // Set background color |
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133 | $getid3->info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($tag_data['data'])), 6, '0', STR_PAD_LEFT)); |
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134 | break; |
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135 | |
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136 | default: |
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137 | /* |
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138 | if ($ReturnAllTagData) { |
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139 | $getid3->info['swf']['tags'][] = $tag_data; |
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140 | } |
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141 | */ |
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142 | break; |
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143 | } |
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144 | |
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145 | $current_offset += $tag_length; |
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146 | } |
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147 | |
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148 | return true; |
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149 | } |
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150 | |
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151 | } |
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152 | |
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153 | |
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154 | ?> |
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