sl@0: /*
sl@0: * Copyright (c) 2004 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:  Definition of the Audio Visualization Observer class.
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifndef MVISUALIZATIONOBSERVER_H
sl@0: #define MVISUALIZATIONOBSERVER_H
sl@0: 
sl@0: class CVisualization;
sl@0: // CLASS DECLARATION
sl@0: 
sl@0: 
sl@0: class TVisualizationData
sl@0:     {
sl@0:     public:
sl@0: 
sl@0:         /**
sl@0:         * Constructor.
sl@0:         */
sl@0:         TVisualizationData() { iFrequencyData = NULL, iWaveFormData = NULL; }
sl@0: 
sl@0: 		TUint64 iTimeStamp;
sl@0: 		const TArray<TUint32>* iFrequencyData;
sl@0: 		const TArray<TInt16>* iWaveFormData;
sl@0: 
sl@0:     };
sl@0: 
sl@0: 
sl@0: /**
sl@0: *  Interface class to be implemented by objects that are interested in receiving notifications
sl@0: *  from Audio Visualization object.
sl@0: *
sl@0: *  @since 3.0
sl@0: */
sl@0: class MVisualizationObserver
sl@0:     {
sl@0:     public:
sl@0: 
sl@0:         /**
sl@0:         * Invoked when the state of the visualization object has changed.
sl@0:         * @since 3.0
sl@0:         * @param aVisualization The visualization object that changed
sl@0:         * @param aData The visualization data.
sl@0:         */
sl@0:         virtual void DataChanged( const CVisualization* aVisualization, TVisualizationData aData ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization data rate changed.
sl@0:         * @since 3.0
sl@0:         * @param aVisualization The visualization object that changed
sl@0:         * @param aData The visualization data.
sl@0:         */
sl@0:         virtual void DataRateChanged( const CVisualization* aVisualization ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization frequency band count changed.
sl@0:         * @since 3.0
sl@0:         * @param aVisualization The visualization object that changed
sl@0:         * @param aData The visualization data.
sl@0:         */
sl@0:         virtual void FrequencyBandCountChanged( const CVisualization* aVisualization ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization is preempted.
sl@0:         * @since 3.0
sl@0:         */
sl@0:         virtual void VisualizationPreempted( ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization is resumed.
sl@0:         * @since 3.0
sl@0:         */
sl@0:         virtual void VisualizationResumed( ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization is started.
sl@0:         * @since 3.0
sl@0:         */
sl@0:         virtual void VisualizationStarted( ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization is stopped.
sl@0:         * @since 3.0
sl@0:         */
sl@0:         virtual void VisualizationStopped( ) = 0;
sl@0: 
sl@0:      	/**
sl@0:         * Invoked when the visualization the waveform data length changed.
sl@0:         * @since 3.0
sl@0:         * @param aVisualization The visualization object that changed
sl@0:         * @param aData The visualization data.
sl@0:         */
sl@0:         virtual void WaveformDataLengthChanged( const CVisualization* aVisualization ) = 0;
sl@0: 
sl@0:     };
sl@0: 
sl@0: #endif      // MVISUALIZATIONOBSERVER_H
sl@0: 
sl@0: // End of File