private async Task InitializeMediaCaptureAsync()
{
// Do not use ConfigureAwait(false), subsequent calls must come from Dispatcher thread
var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
var device = _panel.HasValue
? devices.FirstOrDefault(d => d.EnclosureLocation?.Panel == _panel)
: devices.FirstOrDefault();
// TODO: remove this hack, it defaults the camera to any camera if it cannot find one for a specific panel
device = device ?? devices.FirstOrDefault();
if (device == null)
{
throw new InvalidOperationException("Could not find camera device.");
}
_rotationHelper = new CameraRotationHelper(device.EnclosureLocation);
_rotationHelper.OrientationChanged += OnOrientationChanged;
// Initialize for panel
var settings = new MediaCaptureInitializationSettings
{
VideoDeviceId = device.Id,
};
// Do not use ConfigureAwait(false), subsequent calls must come from Dispatcher thread
await MediaCapture.InitializeAsync(settings);
// Set flash modes
MediaCapture.SetFlashMode(FlashMode);
MediaCapture.SetTorchMode(TorchMode);
// Set to capture element
CaptureElement.Source = MediaCapture;
// Mirror for front facing camera
CaptureElement.FlowDirection = _panel == Windows.Devices.Enumeration.Panel.Front
? FlowDirection.RightToLeft
: FlowDirection.LeftToRight;
// Start preview
// Do not `ConfigureAwait(false), orientation must be set on Dispatcher thread
await MediaCapture.StartPreviewAsync();
// Set preview rotation
await UpdatePreviewOrientationAsync().ConfigureAwait(false);
// Start barcode scanning
if (BarcodeScanningEnabled)
{
_barcodeScanningSubscription.Disposable =
GetBarcodeScanningObservable().Subscribe(result =>
{
BarcodeScanned?.Invoke(result);
});
}
IsInitialized = true;
lock (_initializationGate)
{
_initializationTask = null;
}
}