/*

* Copyright (c) 2006-2009 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

 @publishedPartner 

 @released

*/

#ifndef MAUDIOPROCESSINGUNITOBSERVER_H__

#define MAUDIOPROCESSINGUNITOBSERVER_H__

#include <e32base.h>

#include <a3f/a3fbase.h>

class MAudioProcessingUnit;

/**

 * An interface to a set of audio processing unit callback functions.

 * 

 * this serves as the method of communication between the client and the audio processing unit.

 *

 * The class is a mixin and is intended to be inherited by the client class that is

 * interested in observing the audio processing unit operation. The functions

 * encapsulated by this class are called when specific events occur while

 * processing audio.

 * 

 * this interface is mainly usable for advanced audio clients, that are interested in detailed

 * operation of the processing chain. Most audio clients should be fine with only observing the audio stream.

 * 

 */

class MAudioProcessingUnitObserver

	{

public:

	/**

	* Handles processing unit error event.

	*

	* @param aInstance A pointer to the processing unit instance.

	* @param aError. Propagated error.

	*/

	virtual void ProcessingUnitError(MAudioProcessingUnit* aInstance, TInt aError)=0;

	};

#endif // MAUDIOPROCESSINGUNITOBSERVER_H__