AVCam.CameraViewController.ConfigureSession C# (CSharp) Method

		void ConfigureSession ()
		{
			if (setupResult != AVCamSetupResult.Success)
				return;

			session.BeginConfiguration ();

			// We do not create an AVCaptureMovieFileOutput when setting up the session because the
			// AVCaptureMovieFileOutput does not support movie recording with AVCaptureSessionPresetPhoto.
			session.SessionPreset = AVCaptureSession.PresetPhoto;

			// Add video input.
			// Choose the back dual camera if available, otherwise default to a wide angle camera.
			AVCaptureDevice defaultVideoDevice = AVCaptureDevice.GetDefaultDevice (AVCaptureDeviceType.BuiltInDuoCamera, AVMediaType.Video, AVCaptureDevicePosition.Back)
				?? AVCaptureDevice.GetDefaultDevice (AVCaptureDeviceType.BuiltInWideAngleCamera, AVMediaType.Video, AVCaptureDevicePosition.Back)
				?? AVCaptureDevice.GetDefaultDevice (AVCaptureDeviceType.BuiltInWideAngleCamera, AVMediaType.Video, AVCaptureDevicePosition.Front);

			NSError error;
			var input = AVCaptureDeviceInput.FromDevice (defaultVideoDevice, out error);
			if (error != null) {
				Console.WriteLine ($"Could not create video device input: {error.LocalizedDescription}");
				setupResult = AVCamSetupResult.SessionConfigurationFailed;
				session.CommitConfiguration ();
				return;
			}

			if (session.CanAddInput (input)) {
				session.AddInput (input);
				videoDeviceInput = input;

				DispatchQueue.MainQueue.DispatchAsync (() => {
					// Why are we dispatching this to the main queue?
					// Because AVCaptureVideoPreviewLayer is the backing layer for PreviewView and UIView
					// can only be manipulated on the main thread.
					// Note: As an exception to the above rule, it is not necessary to serialize video orientation changes
					// on the AVCaptureVideoPreviewLayer’s connection with other session manipulation.
					// Use the status bar orientation as the initial video orientation. Subsequent orientation changes are handled by
					// ViewWillTransitionToSize method.
					var statusBarOrientation = UIApplication.SharedApplication.StatusBarOrientation;
					var initialVideoOrientation = AVCaptureVideoOrientation.Portrait;
					AVCaptureVideoOrientation videoOrientation;
					if (statusBarOrientation != UIInterfaceOrientation.Unknown && TryConvertToVideoOrientation(statusBarOrientation, out videoOrientation))
						initialVideoOrientation = videoOrientation;

					PreviewView.VideoPreviewLayer.Connection.VideoOrientation = initialVideoOrientation;
				});
			} else {
				Console.WriteLine ("Could not add video device input to the session");
				setupResult = AVCamSetupResult.SessionConfigurationFailed;
				session.CommitConfiguration ();
				return;
			}

			// Add audio input.
			var audioDevice = AVCaptureDevice.DefaultDeviceWithMediaType (AVMediaType.Audio);
			var audioDeviceInput = AVCaptureDeviceInput.FromDevice (audioDevice, out error);
			if (error != null)
				Console.WriteLine ($"Could not create audio device input: {error.LocalizedDescription}");
			if (session.CanAddInput (audioDeviceInput))
				session.AddInput (audioDeviceInput);
			else
				Console.WriteLine ("Could not add audio device input to the session");

			// Add photo output.
			if (session.CanAddOutput (photoOutput)) {
				session.AddOutput (photoOutput);
				photoOutput.IsHighResolutionCaptureEnabled = true;
				photoOutput.IsLivePhotoCaptureEnabled = photoOutput.IsLivePhotoCaptureSupported;
				livePhotoMode = photoOutput.IsLivePhotoCaptureSupported ? LivePhotoMode.On : LivePhotoMode.Off;
			} else {
				Console.WriteLine ("Could not add photo output to the session");
				setupResult = AVCamSetupResult.SessionConfigurationFailed;
				session.CommitConfiguration ();
				return;
			}
			session.CommitConfiguration ();
		}