[3318] | 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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