private async void MediaCapture_FaceDetected(ExampleMediaCapture sender, FaceDetectedEventArgs args)
{
// This event is raised even when no faces are present, the argument must be inspected
if (args.ResultFrame.DetectedFaces.Any() && FrameReader != null)
{
if (PreviewOpacity == 0.0)
{
await FrameReader.StartAsync();
PreviewOpacity = 1.0;
}
// Reset the countdown to turning off camera
FrameReaderStopTrigger.Stop();
FrameReaderStopTrigger.Start();
}
UpdateSystemRelativeTime(args.ResultFrame.SystemRelativeTime);
}
private async Task StopOperationAsync()
{
MediaCapture.FaceDetected -= MediaCapture_FaceDetected;
FrameReader.FrameArrived -= FrameReader_FrameArrived;
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
CaptureElement.Source = null;
});
await MediaCapture.StopPreviewAsync();
await FrameReader.StopAsync();
FrameCollection.Dispose();
ColorFrameEpochs.Clear();
IlluminatedInfraredFrameEpochs.Clear();
NonIlluminatedInfraredFrameEpochs.Clear();
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, DispatcherTimer.Stop);
FrameReaderStopTrigger.Stop();
}