/*

* Copyright (c) 2004 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:  Definition of the Audio Visualization Observer class.

*

*/

#ifndef MVISUALIZATIONOBSERVER_H

#define MVISUALIZATIONOBSERVER_H

class CVisualization;

// CLASS DECLARATION

class TVisualizationData

    {

    public:

        /**

        * Constructor.

        */

        TVisualizationData() { iFrequencyData = NULL, iWaveFormData = NULL; }

		TUint64 iTimeStamp;

		const TArray<TUint32>* iFrequencyData;

		const TArray<TInt16>* iWaveFormData;

    };

/**

*  Interface class to be implemented by objects that are interested in receiving notifications

*  from Audio Visualization object.

*

*  @since 3.0

*/

class MVisualizationObserver

    {

    public:

        /**

        * Invoked when the state of the visualization object has changed.

        * @since 3.0

        * @param aVisualization The visualization object that changed

        * @param aData The visualization data.

        */

        virtual void DataChanged( const CVisualization* aVisualization, TVisualizationData aData ) = 0;

     	/**

        * Invoked when the visualization data rate changed.

        * @since 3.0

        * @param aVisualization The visualization object that changed

        * @param aData The visualization data.

        */

        virtual void DataRateChanged( const CVisualization* aVisualization ) = 0;

     	/**

        * Invoked when the visualization frequency band count changed.

        * @since 3.0

        * @param aVisualization The visualization object that changed

        * @param aData The visualization data.

        */

        virtual void FrequencyBandCountChanged( const CVisualization* aVisualization ) = 0;

     	/**

        * Invoked when the visualization is preempted.

        * @since 3.0

        */

        virtual void VisualizationPreempted( ) = 0;

     	/**

        * Invoked when the visualization is resumed.

        * @since 3.0

        */

        virtual void VisualizationResumed( ) = 0;

     	/**

        * Invoked when the visualization is started.

        * @since 3.0

        */

        virtual void VisualizationStarted( ) = 0;

     	/**

        * Invoked when the visualization is stopped.

        * @since 3.0

        */

        virtual void VisualizationStopped( ) = 0;

     	/**

        * Invoked when the visualization the waveform data length changed.

        * @since 3.0

        * @param aVisualization The visualization object that changed

        * @param aData The visualization data.

        */

        virtual void WaveformDataLengthChanged( const CVisualization* aVisualization ) = 0;

    };

#endif      // MVISUALIZATIONOBSERVER_H

// End of File