DtImageTaskElement.h

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/****************************************************************************** 
** Copyright (c) 2012 VT-MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 


#pragma once

#include <vrvVideoStream/vrvVideoStream.h>
#include <vrvVideoStream/DtProcessImageTask.h>

namespace makArchives
{
   class DtImageTaskRecord;
}

namespace makVrv
{
   class DT_DLL_VRVVIDEOSTREAM DtImageTaskElement
   {
   public:
      friend class DtImageTaskElementCreator;

      virtual ~DtImageTaskElement();

      virtual void setFromRecord( const makArchives::DtImageTaskRecord& config );

      virtual bool configure();

      void preFrame();

      void processFrame( DtVideoFrameBuffer* frame );
      
      void postFrame();

      virtual void attach( DtImageTaskElement* next );

   protected:
      DtImageTaskElement(DtDe& de, DtProcessImageTask* owningTask);

      virtual void handlePreFrame();

      virtual void handlePostFrame();

      virtual void handleProcessFrame( DtVideoFrameBuffer* frame ) = 0;

   private:
      DtImageTaskElement();

      DtImageTaskElement( const DtImageTaskElement& rhs );

      DtImageTaskElement& operator=( const DtImageTaskElement& orig );

   protected:
      DtDe& myDe;
      DtProcessImageTask* myOwningTask;
      DtImageTaskElement* myNextElement;
   };  
   
   class DT_DLL_VRVVIDEOSTREAM DtImageTaskElementCreator
   {
   public:
      friend class DtVideoStreamManager;

      DtImageTaskElementCreator();

      virtual ~DtImageTaskElementCreator();

   protected:
      virtual DtImageTaskElement* create( DtDe& de, 
         DtProcessImageTask* owningTask  )= 0;
   };
}