1 /*

     2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 /**

    22  @file

    23  @publishedPartner 

    24  @released

    25 */

    26 

    27 

    28 #ifndef MAUDIOPROCESSINGUNITOBSERVER_H__

    29 #define MAUDIOPROCESSINGUNITOBSERVER_H__

    30 

    31 #include <e32base.h>

    32 

    33 #include <a3f/a3fbase.h>

    34 

    35 class MAudioProcessingUnit;

    36 

    37 /**

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

    39  * 

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

    41  *

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

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

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

    45  * processing audio.

    46  * 

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

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

    49  * 

    50  */

    51 class MAudioProcessingUnitObserver

    52 	{

    53 public:

    54 	/**

    55 	* Handles processing unit error event.

    56 	*

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

    58 	* @param aError. Propagated error.

    59 	*/

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

    61 	};

    62 

    63 #endif // MAUDIOPROCESSINGUNITOBSERVER_H__