getID3() by James Heinrich <info@getid3.org> // More...
Public Member Functions | |
| getid3_swf (&$fd, &$ThisFileInfo, $ReturnAllTagData=false) | |
Detailed Description
getID3() by James Heinrich <info@getid3.org> //
Definition at line 17 of file module.audio-video.swf.php.
Member Function Documentation
| getid3_swf::getid3_swf | ( | &$ | fd, | |
| &$ | ThisFileInfo, | |||
| $ | ReturnAllTagData = false | |||
| ) |
Definition at line 20 of file module.audio-video.swf.php.
References getid3_lib::BigEndian2Int(), getid3_lib::Bin2Dec(), and getid3_lib::LittleEndian2Int().
{
$ThisFileInfo['fileformat'] = 'swf';
$ThisFileInfo['video']['dataformat'] = 'swf';
// http://www.openswf.org/spec/SWFfileformat.html
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
//echo 'reading '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' bytes<br>';
$SWFfileData = fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
$ThisFileInfo['swf']['header']['signature'] = substr($SWFfileData, 0, 3);
switch ($ThisFileInfo['swf']['header']['signature']) {
case 'FWS':
$ThisFileInfo['swf']['header']['compressed'] = false;
break;
case 'CWS':
$ThisFileInfo['swf']['header']['compressed'] = true;
break;
default:
$ThisFileInfo['error'][] = 'Expecting "FWS" or "CWS" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['swf']['header']['signature'].'"';
unset($ThisFileInfo['swf']);
unset($ThisFileInfo['fileformat']);
return false;
break;
}
$ThisFileInfo['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1));
$ThisFileInfo['swf']['header']['length'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4));
//echo '1<br>';
if ($ThisFileInfo['swf']['header']['compressed']) {
//echo '2<br>';
// $foo = substr($SWFfileData, 8, 4096);
// echo '['.strlen($foo).']<br>';
// $fee = gzuncompress($foo);
// echo '('.strlen($fee).')<br>';
//return false;
//echo '<br>time: '.time().'<br>';
//return false;
if ($UncompressedFileData = gzuncompress(substr($SWFfileData, 8))) {
//echo '3<br>';
$SWFfileData = substr($SWFfileData, 0, 8).$UncompressedFileData;
} else {
//echo '4<br>';
$ThisFileInfo['error'][] = 'Error decompressing compressed SWF data';
return false;
}
}
$FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3;
$FrameSizeDataLength = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8);
$FrameSizeDataString = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT);
for ($i = 1; $i < $FrameSizeDataLength; $i++) {
$FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
}
list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1));
$ThisFileInfo['swf']['header']['frame_width'] = getid3_lib::Bin2Dec($X2);
$ThisFileInfo['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($Y2);
// http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
// Next in the header is the frame rate, which is kind of weird.
// It is supposed to be stored as a 16bit integer, but the first byte
// (or last depending on how you look at it) is completely ignored.
// Example: 0x000C -> 0x0C -> 12 So the frame rate is 12 fps.
// Byte at (8 + $FrameSizeDataLength) is always zero and ignored
$ThisFileInfo['swf']['header']['frame_rate'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 9 + $FrameSizeDataLength, 1));
$ThisFileInfo['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2));
$ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['swf']['header']['frame_rate'];
$ThisFileInfo['video']['resolution_x'] = intval(round($ThisFileInfo['swf']['header']['frame_width'] / 20));
$ThisFileInfo['video']['resolution_y'] = intval(round($ThisFileInfo['swf']['header']['frame_height'] / 20));
$ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
if (($ThisFileInfo['swf']['header']['frame_count'] > 0) && ($ThisFileInfo['swf']['header']['frame_rate'] > 0)) {
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['swf']['header']['frame_count'] / $ThisFileInfo['swf']['header']['frame_rate'];
}
// SWF tags
$CurrentOffset = 12 + $FrameSizeDataLength;
$SWFdataLength = strlen($SWFfileData);
while ($CurrentOffset < $SWFdataLength) {
$TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2));
$TagID = ($TagIDTagLength & 0xFFFC) >> 6;
$TagLength = ($TagIDTagLength & 0x003F);
$CurrentOffset += 2;
if ($TagLength == 0x3F) {
$TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4));
$CurrentOffset += 4;
}
unset($TagData);
$TagData['offset'] = $CurrentOffset;
$TagData['size'] = $TagLength;
$TagData['id'] = $TagID;
$TagData['data'] = substr($SWFfileData, $CurrentOffset, $TagLength);
switch ($TagID) {
case 0: // end of movie
break 2;
case 9: // Set background color
//$ThisFileInfo['swf']['tags'][] = $TagData;
$ThisFileInfo['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT));
break;
default:
if ($ReturnAllTagData) {
$ThisFileInfo['swf']['tags'][] = $TagData;
}
break;
}
$CurrentOffset += $TagLength;
}
return true;
}
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The documentation for this class was generated from the following file:
- Services/MediaObjects/getid3/getid3/module.audio-video.swf.php
