--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/omxil/mmilapi/ilif/inc/milifobserver.h	Tue Feb 02 01:56:55 2010 +0200
@@ -0,0 +1,68 @@
+// Copyright (c) 2008-2009 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:
+//
+
+/**
+ @file
+ @internalTechnology
+ @prototype
+*/
+
+#ifndef MILIFOBSERVER_H
+#define MILIFOBSERVER_H
+
+#include <e32base.h>
+#include "ilifbase.h"
+
+class CMMFBuffer;
+class MILComponentIf;
+
+/**
+IL Component observer class
+*/
+class MILIfObserver
+	{
+public:
+	/**
+	Callback function to send an event/message to the component observer, i.e. the IL client.
+	
+	@param  aComponent
+	        The IL Component which sent the callback.
+	@param  aEvent
+			A reference to the structure that contains the event data.
+			Any implementation of this function should be able to handle expected and unexpected events.
+	@return An error code indicating if the function call was successful. KErrNone on success, otherwise
+	        another of the system-wide error codes.
+	@see TILEvent
+	*/
+	virtual TInt MsgFromILComponent(const MILComponentIf* aComponent, const TILEvent& aEvent) = 0; 
+
+	/**
+	Callback function to return to the component port observer the buffer that has been delivered.
+	The observer is usually the IL client or another port.
+
+	Note that for some implementations this is essentially equivalent to EmptyBufferDone() from input 
+	ports and FillBufferDone() from output ports.
+
+	@param  aPort
+		  	The interface from the port which sent the callback.
+	@param  aBuffer
+			The buffer returned by the IL component.
+	@return An error code indicating if the function call was successful. KErrNone on success, otherwise
+	        another of the system-wide error codes.
+	*/
+	virtual TInt BufferDelivered(const MILComponentPortIf* aPort, const CMMFBuffer* aBuffer) = 0;
+	};
+	
+#endif // MILIFOBSERVER_H