/*

* Copyright (c) 2008 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:  Video Source subsystem.

*

*/

#ifndef C_MULTIFRAMELOOPAO_H

#define C_MULTIFRAMELOOPAO_H

// INCLUDE FILES

#include <e32base.h>

// FORWARD DECLARATIONS

class CMultiframeProvider;

// MACROS

/**

* @lib videosource.lib

* Handles data looping in multi frame sharing case.

*/

NONSHARABLE_CLASS( CMultiframeloopAO ) : public CActive

    {

    public: // Constructors and destructor

        /**

        * Constructor.

        * @param "aRequester" instance to requester

        */

        CMultiframeloopAO( CMultiframeProvider* aRequester );

        /**

        * Destructor.

        */

        ~CMultiframeloopAO();

        /**

        * Decreases number of free bitmaps

        * @param "aCount" count how many bitmaps to be removed

        */

        void RemoveFreeBitmaps( TInt aCount );

        /**

        * Increases number of free bitmaps

        * @param "aCount" count how many bitmaps to be increased

        */

        void SetFreeBitmaps( TInt aCount );

        /**

        * Cancels looping and completes request in correct thread.

        */

        void CancelDataLoop();

    public: // New functions

        /**

        * Activates looping and completes request in correct thread. 

        */

        void Signal( );

       	/**

        * Sets frame count.

        * @param "aCount" frame count

        */

        void SetFrameCount( TInt aCount );

    private:    // Functions from base classes

        /**

        * From CActive. See CActive for description.

        */

        void RunL();

        /**

        * From CActive. See CActive for description.

        */

        void DoCancel();

    private:    // Data

        // Pointer to requester.

        CMultiframeProvider* iRequester; // not owned

        // Index of frame to be handled

        TInt iIndex;

        // Total nuber of frames

        TInt iFramecount;

        // Number of free bitmaps 

        TInt iFreeBMCount;

        // Id of thread whose active scheduler this instance is added into.

        TThreadId iThreadId;

        // A flag to indecate loop ao must be stopped

        TBool iRequireStopping;

    };

#endif //C_MULTIFRAMELOOPAO_H

// End of File