178f439a92f213ed91e8e0dcbf1f76955f6b1106
2 /////////////////////////////////////////////////////////////////
3 /// getID3() by James Heinrich <info@getid3.org> //
4 // available at http://getid3.sourceforge.net //
5 // or http://www.getid3.org //
6 // also https://github.com/JamesHeinrich/getID3 //
7 /////////////////////////////////////////////////////////////////
8 // See readme.txt for more details //
9 /////////////////////////////////////////////////////////////////
11 // module.audio-video.swf.php //
12 // module for analyzing Shockwave Flash files //
13 // dependencies: NONE //
15 /////////////////////////////////////////////////////////////////
18 class getid3_swf
extends getid3_handler
20 public $ReturnAllTagData = false;
22 public function Analyze() {
23 $info = &$this->getid3
->info
;
25 $info['fileformat'] = 'swf';
26 $info['video']['dataformat'] = 'swf';
28 // http://www.openswf.org/spec/SWFfileformat.html
30 $this->fseek($info['avdataoffset']);
32 $SWFfileData = $this->fread($info['avdataend'] - $info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
34 $info['swf']['header']['signature'] = substr($SWFfileData, 0, 3);
35 switch ($info['swf']['header']['signature']) {
37 $info['swf']['header']['compressed'] = false;
41 $info['swf']['header']['compressed'] = true;
45 $this->error('Expecting "FWS" or "CWS" at offset '.$info['avdataoffset'].', found "'.getid3_lib
::PrintHexBytes($info['swf']['header']['signature']).'"');
47 unset($info['fileformat']);
51 $info['swf']['header']['version'] = getid3_lib
::LittleEndian2Int(substr($SWFfileData, 3, 1));
52 $info['swf']['header']['length'] = getid3_lib
::LittleEndian2Int(substr($SWFfileData, 4, 4));
54 if ($info['swf']['header']['compressed']) {
55 $SWFHead = substr($SWFfileData, 0, 8);
56 $SWFfileData = substr($SWFfileData, 8);
57 if ($decompressed = @gzuncompress
($SWFfileData)) {
58 $SWFfileData = $SWFHead.$decompressed;
60 $this->error('Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($info['swf']['header']['length'] - 8).' bytes uncompressed)');
65 $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
66 $FrameSizeDataLength = ceil((5 +
(4 * $FrameSizeBitsPerValue)) / 8);
67 $FrameSizeDataString = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT
);
68 for ($i = 1; $i < $FrameSizeDataLength; $i++
) {
69 $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 +
$i, 1))), 8, '0', STR_PAD_LEFT
);
71 list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
72 $info['swf']['header']['frame_width'] = getid3_lib
::Bin2Dec($X2);
73 $info['swf']['header']['frame_height'] = getid3_lib
::Bin2Dec($Y2);
75 // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
76 // Next in the header is the frame rate, which is kind of weird.
77 // It is supposed to be stored as a 16bit integer, but the first byte
78 // (or last depending on how you look at it) is completely ignored.
79 // Example: 0x000C -> 0x0C -> 12 So the frame rate is 12 fps.
81 // Byte at (8 + $FrameSizeDataLength) is always zero and ignored
82 $info['swf']['header']['frame_rate'] = getid3_lib
::LittleEndian2Int(substr($SWFfileData, 9 +
$FrameSizeDataLength, 1));
83 $info['swf']['header']['frame_count'] = getid3_lib
::LittleEndian2Int(substr($SWFfileData, 10 +
$FrameSizeDataLength, 2));
85 $info['video']['frame_rate'] = $info['swf']['header']['frame_rate'];
86 $info['video']['resolution_x'] = intval(round($info['swf']['header']['frame_width'] / 20));
87 $info['video']['resolution_y'] = intval(round($info['swf']['header']['frame_height'] / 20));
88 $info['video']['pixel_aspect_ratio'] = (float) 1;
90 if (($info['swf']['header']['frame_count'] > 0) && ($info['swf']['header']['frame_rate'] > 0)) {
91 $info['playtime_seconds'] = $info['swf']['header']['frame_count'] / $info['swf']['header']['frame_rate'];
93 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
98 $CurrentOffset = 12 +
$FrameSizeDataLength;
99 $SWFdataLength = strlen($SWFfileData);
101 while ($CurrentOffset < $SWFdataLength) {
102 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
104 $TagIDTagLength = getid3_lib
::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
105 $TagID = ($TagIDTagLength & 0xFFFC) >> 6;
106 $TagLength = ($TagIDTagLength & 0x003F);
108 if ($TagLength == 0x3F) {
109 $TagLength = getid3_lib
::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
114 $TagData['offset'] = $CurrentOffset;
115 $TagData['size'] = $TagLength;
116 $TagData['id'] = $TagID;
117 $TagData['data'] = substr($SWFfileData, $CurrentOffset, $TagLength);
119 case 0: // end of movie
122 case 9: // Set background color
123 //$info['swf']['tags'][] = $TagData;
124 $info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib
::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT
));
128 if ($this->ReturnAllTagData
) {
129 $info['swf']['tags'][] = $TagData;
134 $CurrentOffset +
= $TagLength;