 
         HappieCameraJSON.initializeProcessingCount();
 
-        _ = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo)
+        _ = AVCaptureDevice.devices(for: AVMediaType.video)
 
         let devices = AVCaptureDevice.devices()
 
         // Loop through all the capture devices on this phone
-        for device in devices! {
+        for device in devices {
             // Make sure this particular device supports video
-            if ((device as AnyObject).hasMediaType(AVMediaTypeVideo)) {
+            if ((device as AnyObject).hasMediaType(AVMediaType.video)) {
                 // Finally check the position and confirm we've got the back camera
-                if((device as AnyObject).position == AVCaptureDevicePosition.back) {
+                if((device as AnyObject).position == AVCaptureDevice.Position.back) {
                     backCameraDevice = device as? AVCaptureDevice
                 }
             }

                try device.lockForConfiguration();

                if(flashState == 0){
                    if(backCameraDevice!.isFlashModeSupported(AVCaptureFlashMode.off)){
                        device.flashMode = AVCaptureFlashMode.off;
                        let image = UIImage(named: "camera_flash_off.png") as UIImage!
                        flashUIButton.setImage(image, for: UIControlState())
                    }
                    if(backCameraDevice!.isTorchModeSupported(AVCaptureTorchMode.off)){
                        device.torchMode = AVCaptureTorchMode.off;
                    }
                    flashState = 1;
                }

                else if(flashState == 1){
                    if(backCameraDevice!.isFlashModeSupported(AVCaptureFlashMode.auto)){
                        device.flashMode = AVCaptureFlashMode.auto;
                        let image = UIImage(named: "camera_flash_auto.png") as UIImage!
                        flashUIButton.setImage(image, for: UIControlState())
                    }
                    if(backCameraDevice!.isTorchModeSupported(AVCaptureTorchMode.off)){
                        device.torchMode = AVCaptureTorchMode.off;
                    }
                    flashState = 2
                }
                else if(flashState == 2){
                    if(backCameraDevice!.isFlashModeSupported(AVCaptureFlashMode.off)){
                        device.flashMode = AVCaptureFlashMode.off;
                        let image = UIImage(named: "camera_flash_on.png") as UIImage!
                        flashUIButton.setImage(image, for: UIControlState())
                    }
                    if(backCameraDevice!.isTorchModeSupported(AVCaptureTorchMode.on)){
                        device.torchMode = AVCaptureTorchMode.on;
                    }

                    flashState = 0;


        previewLayer?.frame = CGRect(x: 0, y: 0, width: width,height: height)
        previewLayer?.bounds = CGRect(x: 0, y: 0,width: width,height: height)
        previewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill;
        
        previewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation(rawValue: orientation.rawValue)!;
        camPreview.layer.addSublayer(previewLayer!)

        captureSession.startRunning()
