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);
}
// Gets the configuration of the specified camera
private async Task <CameraConfig> GetCameraConfiguration(
CameraType cameraType, CameraSensorLocation sensorLocation)
{
CameraConfig cameraConfig = null;
PhotoCaptureDevice photoCaptureDevice = null;
FlashState flash = FlashState.Off;
List <CameraResolution> resolutions = new List <CameraResolution>();
try
{
// Read supported resolutions
System.Collections.Generic.IReadOnlyList <Windows.Foundation.Size> SupportedResolutions =
PhotoCaptureDevice.GetAvailableCaptureResolutions(sensorLocation);
resolutions = (from resolution in SupportedResolutions
select new CameraResolution
{
Width = resolution.Width,
Height = resolution.Height
}).ToList();
// Read flash support.
// Opening camera is required to read flash, request to open with min resolution
var minResolution = SupportedResolutions.OrderBy(size => size.Width).First();
photoCaptureDevice = await PhotoCaptureDevice.OpenAsync(sensorLocation, minResolution);
Enum.TryParse <FlashState>(
photoCaptureDevice.GetProperty(KnownCameraPhotoProperties.FlashMode).ToString(),
true,
out flash);
// Create the camera config
cameraConfig = new CameraConfig
{
Type = (int)cameraType,
Sizes = resolutions,
Flash = flash != FlashState.Off ? true : false
};
}
catch (Exception e)
{
Logger.Error("Error in Camera get configuration. Reason - " + e.Message);
}
finally
{
if (photoCaptureDevice != null)
{
try { photoCaptureDevice.Dispose(); }
catch { }
}
}
return(cameraConfig);
}
private async void AutoFocusTimer_Tick(object sender, EventArgs e)
{
ThrowIfDisposed();
if (!_inited)
{
return;
}
if (_focusTimer.Interval == TimeSpan.FromSeconds(AutoFocusIntervalInSecondsFrist))
{
_focusTimer.Interval = TimeSpan.FromSeconds(AutoFocusIntervalInSeconds);
}
if (!_capturing && !_focusing)
{
// disable flash when auto focus
object oldFlashMode = null;
try
{
if (IsFocusIlluminationModeSupported)
{
oldFlashMode = _device.GetProperty(KnownCameraPhotoProperties.FocusIlluminationMode);
_device.SetProperty(KnownCameraPhotoProperties.FocusIlluminationMode, FocusIlluminationMode.Off);
}
await FocusAsyncInternal();
ThrowIfDisposed();
}
catch
{
if (this.IsDisposed)
{
throw new CardCaptureDeviceDisposedException();
}
else
{
Debug.Assert(false);
}
}
finally
{
if (!IsDisposed && oldFlashMode != null)
{
_device.SetProperty(KnownCameraPhotoProperties.FocusIlluminationMode, oldFlashMode);
}
}
}
}
