/**
* Constructor
*
* @author Tommy Lacroix <*****@*****.**>
* @param int $totalSize
* @param int $boxType
* @param file|string $data
* @param MP4Info_Box $parent
* @return MP4Info_Box_mdhd
* @access public
* @throws MP4Info_Exception
*/
public function __construct($totalSize, $boxType, $data, $parent)
{
if (!self::isCompatible($boxType, $parent)) {
throw new Exception('This box isn\'t "mdhd"');
}
// Get timezone
if (self::$timezone === false) {
self::$timezone = date('Z');
}
// Call ancestor
parent::__construct($totalSize, $boxType, '', $parent);
// Unpack
$ar = unpack('Cversion/C3flags', $data);
if ($ar['version'] == 0) {
// 32 bit
$ar2 = unpack('Nctime/Nmtime/NtimeScale/Nduration/nlanguage/ndummy', substr($data, 4));
} else {
if ($ar['version'] == 1) {
// 64 bit
$ar2 = unpack('N2ctime/N2mtime/NtimeScale/N2duration/nlanguage/ndummy', substr($data, 4));
} else {
throw new Exception('Unhandled version: ' . $ar['version']);
}
}
// Save
$this->version = $ar['version'];
$this->flags = $ar['flags1'] * 65536 + $ar['flags1'] * 256 + $ar['flags1'] * 1;
$this->ctime = date('r', (isset($ar2['ctime']) ? $ar2['ctime'] : $ar2['ctime1']) - 2082826800 - self::$timezone);
$this->mtime = date('r', (isset($ar2['mtime']) ? $ar2['mtime'] : $ar2['mtime1']) - 2082826800 - self::$timezone);
$this->timeScale = $ar2['timeScale'];
$this->duration = isset($ar2['duration']) ? $ar2['duration'] : $ar2['duration1'];
$this->language = MP4Info_Helper::fromPackedLetters($ar2['language'], 1);
}
