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      Symbian多媒體編程系列五 --攝像頭編程(上)

      Symbian培訓-攝像頭編程源代碼下載(SDK第二版)

      攝像頭編程
      一、要點
      1.CCamera類---提供操作攝像頭的各種API.
      調用CCamera::NewL()靜態函數創建一個攝像頭對象,函數原型:
      static CCamera::NewL(MCameraObserver& aObserver,TInt aCameraIndex);
      第一各參數時偵聽類對象,第二個時攝像頭設備的編號。
      創建了攝像頭對象后,應該調用它的Reserve()保留攝像頭。

      2.MCameraObserver---偵聽接口類
      class MCameraObserver
      {
      public:
      virtual void ReseverComplete(TInt aError)=0;
      virtual void PowerOnComplete(TInt aError)=0;
      virtual void ViewFinderFrameReady(CFbsBitmao& aFrame)=0;
      virtual void ImageReady(CFbsBitmao* aBitmap,HBufC8* aData,TInt aError)=0;

      }
      二、步驟
      1.創建和初始化
      (1)聲明observer
      class CImageCapturerEngine : public CBase, public MCameraObserver
      {
      public: // Observer interface
      class MObserver
      {
      public:
      virtual void OnFrame(const CFbsBitmap& aFrame)=0;
      virtual void OnImage(CFbsBitmap* aBitmap)=0;
      virtual void OnError(TInt aError)=0;
      };

      public: // Static constants
      static const TInt KDefaultImageWidth;
      static const TInt KDefaultImageHeight;
      static const CCamera::TFormat KDefaultImageFormat;
      static const TInt KDefaultImageIndex;

      public: // Constructors and destructor
      /**
      * Two-phased constructor.
      */
      static CImageCapturerEngine* NewL(MObserver& aObserver);

      /**
      * Destructor.
      */
      ~CImageCapturerEngine();

      private:
      /**
      * EPOC default constructor.
      */
      CImageCapturerEngine(MObserver& aObserver);
      void ConstructL();

      public: // Functions from MCameraObserver
      /**
      * Indicates camera reservation is complete.
      * Called asynchronously when CCamera::Reserve() completes.
      * @param aError: An error on failure and KErrNone on success
      */
      void ReserveComplete(TInt aError);

      /**
      * Indicates camera power on is complete.
      * Called on completion of CCamera:PowerOn().
      * @param aError: An error on failure and KErrNone on success
      */
      void PowerOnComplete(TInt aError);

      /**
      * Called periodically in response to the use of
      * CCamera::StartViewFinderBitmapsL().
      * @param aFrame: A view finder frame
      */
      void ViewFinderFrameReady(CFbsBitmap& aFrame);

      /**
      * Called asynchronously when CCamera::CaptureImage() completes.
      * Transfers the current image from the camera to the client.
      * @param aBitmap: An image held in CFbsBitmap form if this was the
      * format specified in CCamera::PrepareImageCaptureL().
      * @param aData: a pointer to an HBufC8 if this was the format
      * specified in CCamera::PrepareImageCaptureL().
      * @param aError KErrNone on success or an error code on failure
      */
      void ImageReady(CFbsBitmap* aBitmap,HBufC8* aData,TInt aError);

      /**
      * Called asynchronously when a buffer has been filled with the
      * required number of video frames by CCamera::StartVideoCapture().
      * Passes a filled frame buffer to the client.
      * @param aFrameBuffer: A pointer to an MFrameBuffer if successful, or
      * NULL if not successful.
      * @param aError: KErrNone on success or an error code on failure
      */
      void FrameBufferReady(MFrameBuffer* aFrameBuffer,TInt aError);

      public: // new public methods
      /**
      * Start the view finder
      */
      void StartViewFinderL();

      /**
      * Stop the view finder
      */
      void StopViewFinder();

      /**
      * Asynchronously performs still image capture.
      * Calls MCameraObserver::ImageReady() when complete.
      */
      void CaptureImage();

      private: // new private methods
      /**
      * Performs setup and allocation of memory.
      * Called prior to calling CaptureImage() to keep the latency of that
      * function to a minimum. Needs to be called only once for multiple
      * CaptureImage() calls.
      * May leave with KErrNotSupported or KErrNoMemory
      * @param aImageFormat: The image format, must be one of the formats
      * supported (see TCameraInfo::iImageFormatsSupported)
      */
      void PrepareImageCaptureL(CCamera::TFormat aImageFormat);

      private: // member variables
      /**
      *
      */
      MObserver& iObserver;

      /**
      * The camera object
      */
      CCamera* iCamera;

      /**
      * The resolution of the captured image.
      */
      TSize iSize;
      };

      #endif


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