ILIAS  release_5-2 Revision v5.2.25-18-g3f80b828510
Public Member Functions | Data Fields
GetId3\Module\AudioVideo\Swf Class Reference

GetId3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //. More...

+ Inheritance diagram for GetId3\Module\AudioVideo\Swf:
+ Collaboration diagram for GetId3\Module\AudioVideo\Swf:

Public Member Functions

 analyze ()
 
- Public Member Functions inherited from GetId3\Handler\BaseHandler
 __construct (GetId3Core $getid3, $call_module=null)
 
 analyze ()
 Analyze from file pointer. More...
 
 AnalyzeString (&$string)
 Analyze from string instead. More...
 
 saveAttachment (&$ThisFileInfoIndex, $filename, $offset, $length)
 

Data Fields

 $ReturnAllTagData = false
 

Additional Inherited Members

- Protected Member Functions inherited from GetId3\Handler\BaseHandler
 ftell ()
 
 fread ($bytes)
 
 fseek ($bytes, $whence=SEEK_SET)
 
 feof ()
 
 isDependencyFor ($module)
 
 error ($text)
 
 warning ($text)
 
- Protected Attributes inherited from GetId3\Handler\BaseHandler
 $getid3
 
 $data_string_flag = false
 
 $data_string = ''
 
 $data_string_position = 0
 
 $data_string_length = 0
 

Detailed Description

GetId3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //.

module for analyzing Shockwave Flash files

Author
James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g http://www.getid3.org

Definition at line 29 of file Swf.php.

Member Function Documentation

◆ analyze()

GetId3\Module\AudioVideo\Swf::analyze ( )
Returns
boolean

Definition at line 41 of file Swf.php.

References $info, GetId3\Lib\Helper\BigEndian2Int(), GetId3\Lib\Helper\Bin2Dec(), GetId3\Handler\BaseHandler\fread(), GetId3\Handler\BaseHandler\fseek(), GetId3\Lib\Helper\LittleEndian2Int(), and GetId3\Lib\Helper\PrintHexBytes().

42  {
43  $info = &$this->getid3->info;
44 
45  $info['fileformat'] = 'swf';
46  $info['video']['dataformat'] = 'swf';
47 
48  // http://www.openswf.org/spec/SWFfileformat.html
49 
50  fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
51 
52  $SWFfileData = fread($this->getid3->fp, $info['avdataend'] - $info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
53 
54  $info['swf']['header']['signature'] = substr($SWFfileData, 0, 3);
55  switch ($info['swf']['header']['signature']) {
56  case 'FWS':
57  $info['swf']['header']['compressed'] = false;
58  break;
59 
60  case 'CWS':
61  $info['swf']['header']['compressed'] = true;
62  break;
63 
64  default:
65  $info['error'][] = 'Expecting "FWS" or "CWS" at offset '.$info['avdataoffset'].', found "'.Helper::PrintHexBytes($info['swf']['header']['signature']).'"';
66  unset($info['swf']);
67  unset($info['fileformat']);
68 
69  return false;
70  break;
71  }
72  $info['swf']['header']['version'] = Helper::LittleEndian2Int(substr($SWFfileData, 3, 1));
73  $info['swf']['header']['length'] = Helper::LittleEndian2Int(substr($SWFfileData, 4, 4));
74 
75  if ($info['swf']['header']['compressed']) {
76  $SWFHead = substr($SWFfileData, 0, 8);
77  $SWFfileData = substr($SWFfileData, 8);
78  if ($decompressed = @gzuncompress($SWFfileData)) {
79  $SWFfileData = $SWFHead.$decompressed;
80  } else {
81  $info['error'][] = 'Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($info['swf']['header']['length'] - 8).' bytes uncompressed)';
82 
83  return false;
84  }
85  }
86 
87  $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
88  $FrameSizeDataLength = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8);
89  $FrameSizeDataString = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT);
90  for ($i = 1; $i < $FrameSizeDataLength; $i++) {
91  $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
92  }
93  list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
94  $info['swf']['header']['frame_width'] = Helper::Bin2Dec($X2);
95  $info['swf']['header']['frame_height'] = Helper::Bin2Dec($Y2);
96 
97  // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
98  // Next in the header is the frame rate, which is kind of weird.
99  // It is supposed to be stored as a 16bit integer, but the first byte
100  // (or last depending on how you look at it) is completely ignored.
101  // Example: 0x000C -> 0x0C -> 12 So the frame rate is 12 fps.
102 
103  // Byte at (8 + $FrameSizeDataLength) is always zero and ignored
104  $info['swf']['header']['frame_rate'] = Helper::LittleEndian2Int(substr($SWFfileData, 9 + $FrameSizeDataLength, 1));
105  $info['swf']['header']['frame_count'] = Helper::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2));
106 
107  $info['video']['frame_rate'] = $info['swf']['header']['frame_rate'];
108  $info['video']['resolution_x'] = intval(round($info['swf']['header']['frame_width'] / 20));
109  $info['video']['resolution_y'] = intval(round($info['swf']['header']['frame_height'] / 20));
110  $info['video']['pixel_aspect_ratio'] = (float) 1;
111 
112  if (($info['swf']['header']['frame_count'] > 0) && ($info['swf']['header']['frame_rate'] > 0)) {
113  $info['playtime_seconds'] = $info['swf']['header']['frame_count'] / $info['swf']['header']['frame_rate'];
114  }
115 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
116 
117  // SWF tags
118 
119  $CurrentOffset = 12 + $FrameSizeDataLength;
120  $SWFdataLength = strlen($SWFfileData);
121 
122  while ($CurrentOffset < $SWFdataLength) {
123 //echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>';
124 
125  $TagIDTagLength = Helper::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
126  $TagID = ($TagIDTagLength & 0xFFFC) >> 6;
127  $TagLength = ($TagIDTagLength & 0x003F);
128  $CurrentOffset += 2;
129  if ($TagLength == 0x3F) {
130  $TagLength = Helper::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
131  $CurrentOffset += 4;
132  }
133 
134  unset($TagData);
135  $TagData['offset'] = $CurrentOffset;
136  $TagData['size'] = $TagLength;
137  $TagData['id'] = $TagID;
138  $TagData['data'] = substr($SWFfileData, $CurrentOffset, $TagLength);
139  switch ($TagID) {
140  case 0: // end of movie
141  break 2;
142 
143  case 9: // Set background color
144  //$info['swf']['tags'][] = $TagData;
145  $info['swf']['bgcolor'] = strtoupper(str_pad(dechex(Helper::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
146  break;
147 
148  default:
149  if ($this->ReturnAllTagData) {
150  $info['swf']['tags'][] = $TagData;
151  }
152  break;
153  }
154 
155  $CurrentOffset += $TagLength;
156  }
157 
158  return true;
159  }
GetId3\Lib\Helper\PrintHexBytes
static PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8')
Definition: Helper.php:36
GetId3\Handler\BaseHandler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: BaseHandler.php:148
$info
$info
Definition: example_052.php:80
GetId3\Lib\Helper\LittleEndian2Int
static LittleEndian2Int($byteword, $signed=false)
Definition: Helper.php:413
GetId3\Lib\Helper\BigEndian2Int
static BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: Helper.php:374
GetId3\Lib\Helper\Bin2Dec
static Bin2Dec($binstring, $signed=false)
Definition: Helper.php:496
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Field Documentation

◆ $ReturnAllTagData

GetId3\Module\AudioVideo\Swf::$ReturnAllTagData = false

Definition at line 35 of file Swf.php.

The documentation for this class was generated from the following file: