1 /*

     2 * Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  

    15 *

    16 */

    17 

    18 

    19 #ifndef MMCESTREAMOBSERVER_H

    20 #define MMCESTREAMOBSERVER_H

    21 

    22 // INCLUDES

    23 #include <e32std.h>

    24 

    25 // FORWARD DECLARATIONS

    26 class CMceMediaStream;

    27 class CMceMediaSink;

    28 class CMceMediaSource;

    29 

    30 // CLASS DECLARATION

    31 

    32 /**

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

    34 *  media state events.

    35 *

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

    37 *

    38 *  @lib mceclient.lib

    39 */

    40 class MMceStreamObserver

    41 	{

    42 	public: 

    43 

    44 	    /**

    45 	    * The state of the stream has changed.

    46 	    * @param aStream, the stream that has changed.

    47 	    */

    48 	    virtual void StreamStateChanged( 

    49 	                   CMceMediaStream& aStream) = 0;

    50 

    51 	    /**

    52 	    * The state of the sink has changed.

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

    54 	    * @param aSink, the sink that has changed.

    55 	    */

    56 	    virtual void StreamStateChanged(

    57 	                    CMceMediaStream& aStream,

    58 	                    CMceMediaSink& aSink) = 0;

    59 

    60 	    /**

    61 	    * The state of the source has changed.

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

    63 	    * @param aSource, the source that has changed.

    64 	    */

    65 	    virtual void StreamStateChanged(

    66 	                    CMceMediaStream& aStream,

    67 	                    CMceMediaSource& aSource) = 0;

    68 

    69 	};

    70 

    71 #endif