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-video.swf.php // |
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11 | // module for analyzing Shockwave Flash 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_swf |
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18 | { |
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19 | |
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20 | function getid3_swf(&$fd, &$ThisFileInfo, $ReturnAllTagData=false) { |
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21 | //$start_time = microtime(true); |
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22 | $ThisFileInfo['fileformat'] = 'swf'; |
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23 | $ThisFileInfo['video']['dataformat'] = 'swf'; |
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24 | |
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25 | // http://www.openswf.org/spec/SWFfileformat.html |
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26 | |
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27 | fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); |
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28 | |
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29 | $SWFfileData = fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data |
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30 | |
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31 | $ThisFileInfo['swf']['header']['signature'] = substr($SWFfileData, 0, 3); |
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32 | switch ($ThisFileInfo['swf']['header']['signature']) { |
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33 | case 'FWS': |
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34 | $ThisFileInfo['swf']['header']['compressed'] = false; |
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35 | break; |
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36 | |
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37 | case 'CWS': |
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38 | $ThisFileInfo['swf']['header']['compressed'] = true; |
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39 | break; |
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40 | |
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41 | default: |
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42 | $ThisFileInfo['error'][] = 'Expecting "FWS" or "CWS" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['swf']['header']['signature'].'"'; |
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43 | unset($ThisFileInfo['swf']); |
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44 | unset($ThisFileInfo['fileformat']); |
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45 | return false; |
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46 | break; |
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47 | } |
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48 | $ThisFileInfo['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1)); |
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49 | $ThisFileInfo['swf']['header']['length'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4)); |
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50 | |
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51 | //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; |
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52 | |
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53 | if ($ThisFileInfo['swf']['header']['compressed']) { |
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54 | |
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55 | $SWFHead = substr($SWFfileData, 0, 8); |
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56 | $SWFfileData = substr($SWFfileData, 8); |
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57 | if ($decompressed = @gzuncompress($SWFfileData)) { |
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58 | |
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59 | $SWFfileData = $SWFHead.$decompressed; |
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60 | |
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61 | } else { |
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62 | |
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63 | $ThisFileInfo['error'][] = 'Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($ThisFileInfo['swf']['header']['length'] - 8).' bytes uncompressed)'; |
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64 | return false; |
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65 | |
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66 | } |
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67 | |
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68 | } |
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69 | //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; |
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70 | |
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71 | $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3; |
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72 | $FrameSizeDataLength = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8); |
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73 | $FrameSizeDataString = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT); |
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74 | for ($i = 1; $i < $FrameSizeDataLength; $i++) { |
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75 | $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT); |
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76 | } |
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77 | list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1)); |
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78 | $ThisFileInfo['swf']['header']['frame_width'] = getid3_lib::Bin2Dec($X2); |
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79 | $ThisFileInfo['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($Y2); |
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80 | |
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81 | // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm |
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82 | // Next in the header is the frame rate, which is kind of weird. |
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83 | // It is supposed to be stored as a 16bit integer, but the first byte |
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84 | // (or last depending on how you look at it) is completely ignored. |
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85 | // Example: 0x000C -> 0x0C -> 12 So the frame rate is 12 fps. |
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86 | |
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87 | // Byte at (8 + $FrameSizeDataLength) is always zero and ignored |
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88 | $ThisFileInfo['swf']['header']['frame_rate'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 9 + $FrameSizeDataLength, 1)); |
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89 | $ThisFileInfo['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2)); |
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90 | |
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91 | $ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['swf']['header']['frame_rate']; |
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92 | $ThisFileInfo['video']['resolution_x'] = intval(round($ThisFileInfo['swf']['header']['frame_width'] / 20)); |
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93 | $ThisFileInfo['video']['resolution_y'] = intval(round($ThisFileInfo['swf']['header']['frame_height'] / 20)); |
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94 | $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1; |
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95 | |
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96 | if (($ThisFileInfo['swf']['header']['frame_count'] > 0) && ($ThisFileInfo['swf']['header']['frame_rate'] > 0)) { |
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97 | $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['swf']['header']['frame_count'] / $ThisFileInfo['swf']['header']['frame_rate']; |
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98 | } |
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99 | //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; |
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100 | |
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101 | |
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102 | // SWF tags |
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103 | |
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104 | $CurrentOffset = 12 + $FrameSizeDataLength; |
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105 | $SWFdataLength = strlen($SWFfileData); |
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106 | |
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107 | while ($CurrentOffset < $SWFdataLength) { |
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108 | //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; |
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109 | |
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110 | $TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2)); |
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111 | $TagID = ($TagIDTagLength & 0xFFFC) >> 6; |
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112 | $TagLength = ($TagIDTagLength & 0x003F); |
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113 | $CurrentOffset += 2; |
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114 | if ($TagLength == 0x3F) { |
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115 | $TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4)); |
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116 | $CurrentOffset += 4; |
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117 | } |
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118 | |
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119 | unset($TagData); |
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120 | $TagData['offset'] = $CurrentOffset; |
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121 | $TagData['size'] = $TagLength; |
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122 | $TagData['id'] = $TagID; |
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123 | $TagData['data'] = substr($SWFfileData, $CurrentOffset, $TagLength); |
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124 | switch ($TagID) { |
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125 | case 0: // end of movie |
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126 | break 2; |
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127 | |
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128 | case 9: // Set background color |
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129 | //$ThisFileInfo['swf']['tags'][] = $TagData; |
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130 | $ThisFileInfo['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT)); |
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131 | break; |
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132 | |
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133 | default: |
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134 | if ($ReturnAllTagData) { |
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135 | $ThisFileInfo['swf']['tags'][] = $TagData; |
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136 | } |
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137 | break; |
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138 | } |
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139 | |
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140 | $CurrentOffset += $TagLength; |
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141 | } |
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142 | |
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143 | return true; |
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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 | |
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149 | ?> |
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