1 /*

     2 * Copyright (c) 2008 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:  Video Source subsystem.

    15 *

    16 */

    17 

    18 

    19 #ifndef C_MULTIFRAMELOOPAO_H

    20 #define C_MULTIFRAMELOOPAO_H

    21 

    22 // INCLUDE FILES

    23 #include <e32base.h>

    24 

    25 // FORWARD DECLARATIONS

    26 class CMultiframeProvider;

    27 

    28 // MACROS

    29 

    30 /**

    31 * @lib videosource.lib

    32 * Handles data looping in multi frame sharing case.

    33 */

    34 NONSHARABLE_CLASS( CMultiframeloopAO ) : public CActive

    35     {

    36     public: // Constructors and destructor

    37 

    38         /**

    39         * Constructor.

    40         * @param "aRequester" instance to requester

    41         */

    42         CMultiframeloopAO( CMultiframeProvider* aRequester );

    43 

    44         /**

    45         * Destructor.

    46         */

    47         ~CMultiframeloopAO();

    48         

    49         /**

    50         * Decreases number of free bitmaps

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

    52         */

    53         void RemoveFreeBitmaps( TInt aCount );

    54         

    55         /**

    56         * Increases number of free bitmaps

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

    58         */

    59         void SetFreeBitmaps( TInt aCount );

    60         

    61         /**

    62         * Cancels looping and completes request in correct thread.

    63         */

    64         void CancelDataLoop();

    65 

    66     public: // New functions

    67 

    68         /**

    69         * Activates looping and completes request in correct thread. 

    70         */

    71         void Signal( );

    72         

    73        	/**

    74         * Sets frame count.

    75         * @param "aCount" frame count

    76         */

    77         void SetFrameCount( TInt aCount );

    78 

    79     private:    // Functions from base classes

    80 

    81         /**

    82         * From CActive. See CActive for description.

    83         */

    84         void RunL();

    85 

    86         /**

    87         * From CActive. See CActive for description.

    88         */

    89         void DoCancel();

    90 

    91     private:    // Data

    92 

    93         // Pointer to requester.

    94         CMultiframeProvider* iRequester; // not owned

    95         

    96         // Index of frame to be handled

    97         TInt iIndex;

    98         

    99         // Total nuber of frames

   100         TInt iFramecount;

   101         

   102         // Number of free bitmaps 

   103         TInt iFreeBMCount;

   104         

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

   106         TThreadId iThreadId;

   107         

   108         // A flag to indecate loop ao must be stopped

   109         TBool iRequireStopping;

   110     };

   111 #endif //C_MULTIFRAMELOOPAO_H

   112 

   113 // End of File