diff -r 000000000000 -r bde4ae8d615e os/mm/devsound/a3facf/inc/maudiocodecobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/mm/devsound/a3facf/inc/maudiocodecobserver.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,85 @@
+/*
+* Copyright (c) 2007-2009 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:
+* Save as expressly licensed to you by Symbian Software Ltd, all rights reserved.
+* 
+*
+*/
+
+
+
+/**
+ @file
+ @publishedPartner
+ @released
+*/
+
+#ifndef MAUDIOCODECOBSERVER_H
+#define MAUDIOCODECOBSERVER_H
+
+#include <e32base.h>
+#include <a3f/a3fbase.h>
+
+/**
+ *  An interface to a set of AudioGainControl callback functions.
+ *
+ *  This serves as the method of communication between the client and the
+ *  AudioGainControl.
+ *
+ *  The class is a mixin and is intended to be inherited by the client class
+ *  that is interested in observing the Gain operations. The functions
+ *  encapsulated by this class are called when specific events occur while
+ *  processing audio.
+ *
+ */
+class MAudioCodecObserver
+	{
+public:
+
+	/**
+	* Callback showing completion SetSampleRate().
+	*
+	* @param aError will be KErrNone if the action succeeded, otherwise it will be a system error
+	* specific errors to be defined.
+	*/
+	virtual void SampleRateSet(TInt aError)=0;
+
+	/**
+	* Callback showing completion SetMode().
+	*
+	* @param aError will be KErrNone if the action succeeded, otherwise it will be a system error
+	* specific errors to be defined.
+	*/
+	virtual void ModeSet(TInt aError)=0;
+
+	/**
+	* Callback showing completion GetSupportedSampleRates().
+	*
+	* @param Error will be KErrNone if the action succeeded, otherwise it will be a system error 
+	* specific errors to be defined. If aError is not KErrNone, then the state of aSupportedRates is undefined.
+	*/
+	virtual void GetSupportedSampleRatesComplete (TInt aError)=0;
+
+	/**
+	* Callback showing completion GetSupportedModes().
+	*
+	* @param aError will be KErrNone if the action succeeded, otherwise it will be a system error
+	* specific errors to be defined. If aError is not KErrNone, then the state of aSupportedModes is undefined.
+	*/
+	virtual void GetSupportedModesComplete (TInt aError)=0;
+
+	};
+
+#endif // MAUDIOCODECOBSERVER_H
+