diff -r 000000000000 -r 40261b775718 devsound/devsoundapi/inc/mmfdevsoundcustominterfaceobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/devsound/devsoundapi/inc/mmfdevsoundcustominterfaceobserver.h	Tue Feb 02 01:56:55 2010 +0200
@@ -0,0 +1,45 @@
+
+// MmfDevSoundCustomInterfaceObserver.h
+
+// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+/**
+ @internalComponent
+ @released
+ @file
+*/
+
+#ifndef MMFDEVSOUNDCUSTOMINTERFACEOBSERVER_H
+#define MMFDEVSOUNDCUSTOMINTERFACEOBSERVER_H
+
+/**
+@internalComponent
+
+The class is a mixin and is intended to support for closing the Mux and Demux pair in a
+DevSound Custom Interface. The function encapsulated by this class is called whenever the 
+MMMFDevSoundCustomInterfaceDeMuxPlugin::RefreshL method leaves.
+*/
+class MMMFDevSoundCustomInterfaceObserver
+	{	
+public:
+	
+	/**
+	Closes the Mux and Demux pair of a DevSound Custom Interface.
+	*/
+	virtual void CloseCustomInterface(TInt aIndex) = 0;
+	};	
+
+#endif // MMFDEVSOUNDCUSTOMINTERFACEOBSERVER_H