/*

 * 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__