diff -r 000000000000 -r bde4ae8d615e os/mm/devsoundextensions/effects/BassBoost/BassBoostProxy/Src/MBassBoostCallback.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/mm/devsoundextensions/effects/BassBoost/BassBoostProxy/Src/MBassBoostCallback.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,53 @@
+/*
+* Copyright (c) 2004 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:  Interface for Bass Boost call back 
+*
+*/
+
+
+
+
+#ifndef BASSBOOSTCALLBACK_H
+#define BASSBOOSTCALLBACK_H
+
+//  INCLUDES
+
+// CLASS DECLARATION
+
+
+/**
+*  Interface class to be implemented by objects that receives callbacks from BassBoost Event Observer.
+*
+*  @since 3.0
+*/
+class MBassBoostCallback
+    {
+    public:
+
+        /**
+        * Invoked by the BassBoost Event Observer when the bassboost object changes state
+        * @since 3.0
+        * @param aBuffer Buffer containing the bassboost data
+        */
+        //virtual void BassBoostEvent( TEfBassBoostDataPckg& aDataPckg ) = 0;
+        virtual void BassBoostEvent( TDesC8& aDataPckg ) = 0;
+
+
+    };
+
+
+
+#endif      // BASSBOOSTCALLBACK_H
+
+// End of File