sl@0: /*
sl@0: * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description:
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: /**
sl@0:  @file
sl@0:  @publishedPartner 
sl@0:  @released
sl@0: */
sl@0: 
sl@0: 
sl@0: #ifndef MAUDIOPROCESSINGUNITOBSERVER_H__
sl@0: #define MAUDIOPROCESSINGUNITOBSERVER_H__
sl@0: 
sl@0: #include <e32base.h>
sl@0: 
sl@0: #include <a3f/a3fbase.h>
sl@0: 
sl@0: class MAudioProcessingUnit;
sl@0: 
sl@0: /**
sl@0:  * An interface to a set of audio processing unit callback functions.
sl@0:  * 
sl@0:  * this serves as the method of communication between the client and the audio processing unit.
sl@0:  *
sl@0:  * The class is a mixin and is intended to be inherited by the client class that is
sl@0:  * interested in observing the audio processing unit operation. The functions
sl@0:  * encapsulated by this class are called when specific events occur while
sl@0:  * processing audio.
sl@0:  * 
sl@0:  * this interface is mainly usable for advanced audio clients, that are interested in detailed
sl@0:  * operation of the processing chain. Most audio clients should be fine with only observing the audio stream.
sl@0:  * 
sl@0:  */
sl@0: class MAudioProcessingUnitObserver
sl@0: 	{
sl@0: public:
sl@0: 	/**
sl@0: 	* Handles processing unit error event.
sl@0: 	*
sl@0: 	* @param aInstance A pointer to the processing unit instance.
sl@0: 	* @param aError. Propagated error.
sl@0: 	*/
sl@0: 	virtual void ProcessingUnitError(MAudioProcessingUnit* aInstance, TInt aError)=0;
sl@0: 	};
sl@0: 
sl@0: #endif // MAUDIOPROCESSINGUNITOBSERVER_H__