diff --git a/headers/private/media/MediaMisc.h b/headers/private/media/MediaMisc.h
new file mode 100644
index 0000000000..239177013b
--- /dev/null
+++ b/headers/private/media/MediaMisc.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2003 Marcus Overhagen.
+ * All Rights Reserved.
+ *
+ * This file may be used under the terms of the MIT License.
+ */
+
+#ifndef _MEDIA_MISC_H_
+#define _MEDIA_MISC_H_
+
+#define IS_INVALID_NODE(_node) 			((_node).node <= 0 || (_node).port <= 0)
+#define IS_INVALID_NODEID(_id) 			((_id) <= 0)
+#define IS_INVALID_SOURCE(_src)			((_src).port <= 0)
+#define IS_INVALID_DESTINATION(_dest) 	((_dest).port <= 0)
+
+#endif