/*+
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* Copyright (c) 2005 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:    +
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*+
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*/+
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+
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#ifndef MMCESTREAMOBSERVER_H+
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#define MMCESTREAMOBSERVER_H+
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+
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// INCLUDES+
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#include <e32std.h>+
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+
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// FORWARD DECLARATIONS+
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class CMceMediaStream;+
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class CMceMediaSink;+
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class CMceMediaSource;+
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+
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// CLASS DECLARATION+
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+
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/**+
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*  An interface to be implemented by users of MCE if they wish to receive+
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*  media state events.+
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*+
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*  This observer is set using CMceManager::SetMediaObserver function.+
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*+
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*  @lib mceclient.lib+
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*/+
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class MMceStreamObserver+
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	{+
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	public: +
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+
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	    /**+
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	    * The state of the stream has changed.+
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	    * @param aStream, the stream that has changed.+
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	    */+
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	    virtual void StreamStateChanged( +
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	                   CMceMediaStream& aStream) = 0;+
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+
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	    /**+
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	    * The state of the sink has changed.+
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	    * @param aStream, the stream that uses the sink.+
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	    * @param aSink, the sink that has changed.+
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	    */+
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	    virtual void StreamStateChanged(+
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	                    CMceMediaStream& aStream,+
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	                    CMceMediaSink& aSink) = 0;+
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+
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	    /**+
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	    * The state of the source has changed.+
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	    * @param aStream, the stream that uses the source.+
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	    * @param aSource, the source that has changed.+
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	    */+
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	    virtual void StreamStateChanged(+
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	                    CMceMediaStream& aStream,+
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	                    CMceMediaSource& aSource) = 0;+
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+
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	};+
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+
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#endif+
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