/**
* Create a box from file stream
*
* @author Tommy Lacroix <*****@*****.**>
* @param file $f
* @param MP4Info_Box|false $parent
* @return MP4Info_Box
* @access public
* @static
*/
public static function fromStream($f, $parent = false)
{
// Get box header
$buf = fread($f, 8);
if (strlen($buf) < 8) {
return false;
}
$ar = unpack('NtotalSize/NboxType', $buf);
if ($ar['totalSize'] == 1) {
// Size is bigger than 4GB :-O die
// Skip ExtendedSize(UI64) and try to decode anyway
$buf = fread($f, 8);
$ar2 = unpack('N2extSize', $buf);
if ($ar2['extSize1'] > 0) {
throw new Exception('Extended size not supported');
} else {
$ar['totalSize'] = $ar2['extSize2'];
}
}
// Check if we need to skip
if (self::skipBoxType($ar['boxType'])) {
//print '+++ Skipping box '.pack('N',$ar['boxType']).'<br>';
fseek($f, $ar['totalSize'] - 8, SEEK_CUR);
return self::fromStream($f, $parent);
}
// Check if box is a container, and skip it if so
if (self::ignoreBoxType($ar['boxType'])) {
//print '+++ Ignoring box '.pack('N',$ar['boxType']).' of size '.$ar['totalSize'].'<br>';
return self::fromStream($f, $parent);
}
// Get box content
if ($ar['totalSize'] > 0) {
if ($ar['totalSize'] < 256 * 1024) {
$data = fread($f, $ar['totalSize'] - 8);
} else {
$data = $f;
}
} else {
$data = '';
}
// Create box object
$box = MP4Info_Box::factory($ar['totalSize'], $ar['boxType'], $data, $parent);
//print 'Got box from stream of type 0x'.dechex($ar['boxType']).'('.pack('N',$ar['boxType']).') and size '.$ar['totalSize'].' bytes: '.$box->toString().'<br>';
return $box;
}
