/*

* Copyright (c) 2005 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:  

*

*/

#ifndef MMCESTREAMOBSERVER_H

#define MMCESTREAMOBSERVER_H

// INCLUDES

#include <e32std.h>

// FORWARD DECLARATIONS

class CMceMediaStream;

class CMceMediaSink;

class CMceMediaSource;

// CLASS DECLARATION

/**

*  An interface to be implemented by users of MCE if they wish to receive

*  media state events.

*

*  This observer is set using CMceManager::SetMediaObserver function.

*

*  @lib mceclient.lib

*/

class MMceStreamObserver

	{

	public: 

	    /**

	    * The state of the stream has changed.

	    * @param aStream, the stream that has changed.

	    */

	    virtual void StreamStateChanged( 

	                   CMceMediaStream& aStream) = 0;

	    /**

	    * The state of the sink has changed.

	    * @param aStream, the stream that uses the sink.

	    * @param aSink, the sink that has changed.

	    */

	    virtual void StreamStateChanged(

	                    CMceMediaStream& aStream,

	                    CMceMediaSink& aSink) = 0;

	    /**

	    * The state of the source has changed.

	    * @param aStream, the stream that uses the source.

	    * @param aSource, the source that has changed.

	    */

	    virtual void StreamStateChanged(

	                    CMceMediaStream& aStream,

	                    CMceMediaSource& aSource) = 0;

	};

#endif