/*

* Copyright (c) 2007 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:  observer for CUpnpImageRenderingEngine

*

*/

#ifndef UPNP_IMAGERENDERINGENGINEOBSERVER_H

#define UPNP_IMAGERENDERINGENGINEOBSERVER_H

// INCLUDES

#include <e32base.h>

#include "upnpavrenderingsessionobserver.h" // base class

#include "upnpitemresolverobserver.h" // base class

// FORWARD DECLARATIONS

class CUpnpAVDevice;

class MUPnPAVController;

class MUPnPAVRenderingSession;

class MUPnPAVSessionBase;

class MUPnPItemResolver;

class CUPnPCommonUI;

/**

* Observer interface for image rendering engine.

*

* @since S60 3.2

*/

class MUpnpImageRenderingEngineObserver

    {

    public:

        /**

         * Requests for media to be rendered.

         * this method is called soon after calling PlayL().

         * the client is expected to provide an item resolver prepared with

         * the media to be played back (but not resolved yet)

         * ownership is transferred in this transaction.

         * if client returns NULL playback will fail to KErrCancelled

         * 

         * @return the resolver representing media to be played

         */

        virtual MUPnPItemResolver* GetMedia() = 0;

        /**

         * Acknowledge for render request

         * @param aError any errors that occurred

         * @param aItem the actual item that is playing, trying to play, or

         *        NULL if such is not available for some error condition

		 * @return response error code

		 *         KErrNone if the engine should carry on working

		 *         KErrDisconnected if engine should disconnect

         */

        virtual TInt RenderAck(

            TInt aError,

            const CUpnpItem* aItem ) = 0; 

        /**

         * Notifies that rendering engine will shut down due to

         * communication failure.

         * @param aError the error code (some kind of reason)

         */

        virtual void EngineShutdown(

            TInt aError ) = 0;

    };

#endif // UPNP_IMAGERENDERINGENGINEOBSERVER_H

// End of File