Camera2 TakePhoto error CaptureRequest contains unconfigured Input/Output Surface

Question

I use Camera2forms

when I take pictures with a camera ( front or rear) in work, but when I switch camera and I want to take photo there is an error
'CaptureRequest contains unconfigured Input/Output Surface!'

code for switch camera :

            _camera.ReOpenCamera((_currentElement.Camera == CustomViews.CameraOptions.Front) ? true : false);  

code for open camera :

public void ReOpenCamera(bool IsFrontCameraOn)  
        {  
            if (!IsFrontCameraOn)  
            {  
                CloseCamera();  
                OpenCamera(_cameraTexture.Width, _cameraTexture.Height);  
            }  
            else  
            {  
                CloseCamera();  
                OpenFrontCamera(_cameraTexture.Width, _cameraTexture.Height);  
            }  
  
            StartPreview();  
        }  
  
        public void OpenCamera(int width, int height)  
        {  
            if (_context == null || OpeningCamera)  
            {  
                return;  
            }  
  
            OpeningCamera = true;  
  
            SetUpCameraOutputs(width, height);  
  
            _manager.OpenCamera("0", _cameraStateListener, null);  
  
        }  
  
        public void OpenFrontCamera(int width, int height)  
        {  
            if (_context == null || OpeningCamera)  
            {  
                return;  
            }  
  
            OpeningCamera = true;  
  
            SetUpCameraOutputs(width, height);  
  
            _manager.OpenCamera("1", _cameraStateListener, null);  
  
        }  
  
        // Closes the current {@link CameraDevice}.  
        private void CloseCamera()  
        {  
            try  
            {  
  
                if (null != _previewSession)  
                {  
                    _previewSession.Close();  
                    _previewSession = null;  
                }  
                if (null != CameraDevice)  
                {  
                    CameraDevice.Close();  
                    CameraDevice = null;  
                }  
                if (null != _imageReader)  
                {  
                    _imageReader.Close();  
                    _imageReader = null;  
                }  
            }  
            catch (InterruptedException e)  
            {  
                throw new RuntimeException("Interrupted while trying to lock camera closing.", e);  
            }  
            finally  
            {  
            }  
        }  

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Based on your error, The reason for this error is that we are capturing a capture (that is, when taking a picture), cameraCaptureSession.capture(createCaptureImageRequest(), cameraCaptureSessionCaptureCallback, null); the captureRequest parameter requires addTarget a surface, and the surface must be cameraDevice.createCaptureSession(previewSurfaceList , CameraCaptureSessionStateCallback, null); a subset of this previewSurfaceList, otherwise an exception will be reported

I find a similar thread based on your error when using Camera2.

https://stackoverflow.com/questions/55206571/how-do-i-get-the-camera2-api-to-work-a-second-time

After change the front camera, I use following code in CameraViewServiceRenderer.cs,

   public void TakePicture()  
           {  
               if (_camera._cameraId == "0")  
               {  
                   _camera.LockFocus();  
               }  
               else  
               {  
                   _camera.CaptureStillPicture();  
               }  
                 
           }  

Then open the CameraDroid.cs, I achieve this function.

   public void CaptureStillPicture()  
           {  
               try  
               {  
                    
                   if ( null == CameraDevice)  
                   {  
                       return;  
                   }  
     
                   // THIS WAS NOT RELEASING THE RESOURCES AND SHOULD BE REMOVED FROM THE SAMPLE!  
                   //// This is the CaptureRequest.Builder that we use to take a picture.  
                   ////if (stillCaptureBuilder == null)  
                   ////   stillCaptureBuilder = mCameraDevice.CreateCaptureRequest(CameraTemplate.StillCapture);  
     
                   // This is the proper code              
                   var stillCaptureBuilder = CameraDevice.CreateCaptureRequest(CameraTemplate.StillCapture);  
     
                   stillCaptureBuilder.AddTarget(_imageReader.Surface);  
     
                   // Use the same AE and AF modes as the preview.  
                   stillCaptureBuilder.Set(CaptureRequest.ControlAfMode, (int)ControlAFMode.ContinuousPicture);  
                   SetAutoFlash(stillCaptureBuilder);  
     
                   // Orientation  
                   IWindowManager windowManager = Context.GetSystemService(Context.WindowService).JavaCast<IWindowManager>();  
                   var rotation = windowManager.DefaultDisplay.Rotation;  
                   // int rotation = (int)_context.WindowManager.DefaultDisplay.Rotation;  
                   stillCaptureBuilder.Set(CaptureRequest.JpegOrientation, (int)rotation);  
     
                   _previewSession.StopRepeating();  
                   _previewSession.AbortCaptures();  
     
                   try  
                   {  
                       _previewSession.Capture(stillCaptureBuilder.Build(), new CameraCaptureStillPictureSessionCallback(), null);  
                   }  
                   catch (System.Exception e)  
                   {  
                       throw;  
                   }  
     
               }  
               catch (CameraAccessException e)  
               {  
                   e.PrintStackTrace();  
               }  
           }  

Best Regards,

Leon Lu

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