async private Task <PhotoCaptureDevice> InitCamera(CameraPreviewSettings settings, CameraSensorLocation loc)
{
PhotoCaptureDevice camera = await OpenCamera(settings.Width, settings.Height, loc);
UInt32 iso = Helper.GetISO((UInt32)settings.ISO, loc);
Nullable <UInt32> wb = Helper.GetWhiteBalance(settings.WhiteBalance, loc);
CameraCapturePropertyRange focusRange = PhotoCaptureDevice.GetSupportedPropertyRange(loc, KnownCameraGeneralProperties.ManualFocusPosition);
UInt32 focusDistance = settings.FocusDistance.Equals("min", StringComparison.OrdinalIgnoreCase) ? (UInt32)focusRange.Min : (UInt32)focusRange.Max;
camera.SetProperty(KnownCameraPhotoProperties.ExposureCompensation, 0);
camera.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashState.Off);
camera.SetProperty(KnownCameraPhotoProperties.FocusIlluminationMode, 0);
if (wb.HasValue)
{
camera.SetProperty(KnownCameraPhotoProperties.WhiteBalancePreset, wb.Value);
_waitForWb = true;
Debug.WriteLine("Using WB value: {0}", wb.Value);
}
camera.SetProperty(KnownCameraPhotoProperties.Iso, iso);
camera.SetProperty(KnownCameraGeneralProperties.ManualFocusPosition, focusDistance);
Debug.WriteLine("Using ISO: {0}, Using Focus Distance: {1}", camera.GetProperty(KnownCameraPhotoProperties.Iso), camera.GetProperty(KnownCameraGeneralProperties.ManualFocusPosition));
return(camera);
}
async public void TakePictures(CameraPreviewSettings settings)
{
ResetVariables();
_settings = settings;
_photoDevice = await InitCamera(_settings, SENSOR_LOCATION);
// Init buffer
_frameBuffer = new byte[(int)_photoDevice.PreviewResolution.Width * (int)_photoDevice.PreviewResolution.Height * 2];
Debug.WriteLine("Capturing {0} frames...", _settings.Frames);
await _photoDevice.FocusAsync();
_photoDevice.PreviewFrameAvailable += OnPreviewFrame;
}
