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/*
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* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: Definition of the Audio Visualization Observer class.
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*
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*/
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#ifndef MVISUALIZATIONOBSERVER_H
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#define MVISUALIZATIONOBSERVER_H
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class CVisualization;
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// CLASS DECLARATION
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class TVisualizationData
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{
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public:
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/**
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* Constructor.
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*/
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TVisualizationData() { iFrequencyData = NULL, iWaveFormData = NULL; }
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TUint64 iTimeStamp;
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const TArray<TUint32>* iFrequencyData;
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const TArray<TInt16>* iWaveFormData;
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};
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/**
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* Interface class to be implemented by objects that are interested in receiving notifications
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* from Audio Visualization object.
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*
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* @since 3.0
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*/
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class MVisualizationObserver
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{
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public:
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/**
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* Invoked when the state of the visualization object has changed.
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* @since 3.0
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* @param aVisualization The visualization object that changed
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* @param aData The visualization data.
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*/
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virtual void DataChanged( const CVisualization* aVisualization, TVisualizationData aData ) = 0;
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/**
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* Invoked when the visualization data rate changed.
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* @since 3.0
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* @param aVisualization The visualization object that changed
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* @param aData The visualization data.
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*/
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virtual void DataRateChanged( const CVisualization* aVisualization ) = 0;
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/**
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* Invoked when the visualization frequency band count changed.
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* @since 3.0
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* @param aVisualization The visualization object that changed
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* @param aData The visualization data.
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*/
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virtual void FrequencyBandCountChanged( const CVisualization* aVisualization ) = 0;
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/**
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* Invoked when the visualization is preempted.
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* @since 3.0
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*/
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virtual void VisualizationPreempted( ) = 0;
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/**
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* Invoked when the visualization is resumed.
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* @since 3.0
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*/
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virtual void VisualizationResumed( ) = 0;
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/**
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* Invoked when the visualization is started.
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* @since 3.0
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*/
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virtual void VisualizationStarted( ) = 0;
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/**
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* Invoked when the visualization is stopped.
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* @since 3.0
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*/
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virtual void VisualizationStopped( ) = 0;
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/**
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* Invoked when the visualization the waveform data length changed.
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* @since 3.0
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* @param aVisualization The visualization object that changed
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* @param aData The visualization data.
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*/
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virtual void WaveformDataLengthChanged( const CVisualization* aVisualization ) = 0;
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};
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#endif // MVISUALIZATIONOBSERVER_H
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// End of File
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