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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,v 1.2 2006/11/02 10:48:00 ah Exp $
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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 ?> |
