--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmfenh/enhancedmediaclient/Plugins/DataBufferSource/src/DataCopyEngineAO.h	Tue Feb 02 01:08:46 2010 +0200
@@ -0,0 +1,108 @@
+/*
+* Copyright (c) 2006 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:  Definition of the stream source reader active object class
+*
+*/
+
+
+#ifndef DATACOPYENGINEAO_H
+#define DATACOPYENGINEAO_H
+
+// INCLUDES
+#include <e32base.h>
+
+class CSourceQueueItem;
+class CSinkQueueItem;
+class MDataCopyEngineObserver;
+
+
+class CDataCopyEngineAO : public CActive
+    {
+    public: // Constructors and destructor
+        
+		/**
+		* Two-phased constructor.
+		*/
+        static CDataCopyEngineAO* NewL( TSglQue<CSourceQueueItem>* aSourceQueue,
+            TSglQue<CSinkQueueItem>* aSinkQueue,
+            MDataCopyEngineObserver& aObserver );
+        
+		/**
+		* Destructor.
+		*/
+        virtual ~CDataCopyEngineAO();
+        
+        // Called by DataBufferSource when a request is added to source queue
+        void SourceQueueChanged();
+        // Called by DataBufferSource when a request is added to sink queue
+        void SinkQueueChanged();
+        // Called by DataBufferSource to start the engine
+        void Start();
+        // Called by DataBufferSource to stop the engine
+        void Stop();
+        // Called by DataBufferSource to pause the engine
+        void Pause();
+        
+        // Called by Active Object framework
+        virtual void RunL();
+        virtual void DoCancel();
+        virtual TInt RunError(TInt aError);
+    private:
+        
+    /**
+    * C++ default constructor.
+        */
+        CDataCopyEngineAO( TSglQue<CSourceQueueItem>* aSourceQueue,
+            TSglQue<CSinkQueueItem>* aSinkQueue,
+            MDataCopyEngineObserver& aObserver );
+        
+            /**
+            * By default Symbian 2nd phase constructor is private.
+        */
+        void ConstructL();
+        
+        // Used by this to keep the AO going
+        void KickSignal();
+        
+    private:
+        enum TDataCopyEngineState
+            {
+            EStopped,       // Stopped state
+                EPaused,        // Paused state
+                EExecuting,     // Copying data
+                EWaitingForSourceQueueSignal,   // Waiting for item to be available in the source queue
+                EWaitingForSinkQueueSignal
+            };
+        
+        // Reference to Source queue passed in thru constructor
+        TSglQue<CSourceQueueItem>*  iSourceQueue;
+        // Reference to Sink queue passed in thru constructor
+        TSglQue<CSinkQueueItem>*    iSinkQueue;
+        // Reference to observer
+        MDataCopyEngineObserver*    iObserver;
+        // State of the engine
+        TDataCopyEngineState        iState;
+        // Holds true if source queue item is processed
+        TBool                       iSourceQueueItemProcessed;
+        // Holds true if sink queue item is processed
+        TBool                       iSinkQueueItemProcessed;        
+        // Temporary buffer containing data from source queue
+        HBufC8*                     iSrcDataDes;
+        // Data Position within the temporary buffer
+        TInt                        iSrcDataPos;
+    };
+
+#endif      // DATACOPYENGINEAO_H
+
+//  End of File