/**
* @param mixed $writer
* @param PlayReadyContentKey $contentKey
*/
private static function serializeContentKey($writer, $contentKey)
{
if ($contentKey instanceof ContentEncryptionKeyFromHeader) {
$writer->startElement('ContentKey');
$writer->writeAttributeNS('i', 'type', null, 'ContentEncryptionKeyFromHeader');
$writer->endElement();
}
if ($contentKey instanceof ContentEncryptionKeyFromKeyIdentifier) {
$writer->startElement('ContentKey');
$writer->writeAttributeNS('i', 'type', null, 'ContentEncryptionKeyFromKeyIdentifier');
$writer->writeElement('KeyIdentifier', $contentKey->getKeyIdentifier());
$writer->endElement();
}
}
