private async Task StopOperationAsync()
{
Stopwatch.Stop();
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
CaptureElement.Source = null;
});
FrameReader.FrameArrived -= FrameReader_FrameArrived;
try
{
await MediaCapture.StopPreviewAsync();
}
catch (Exception e) when(e.HResult == unchecked ((int)0xc00dabe4) &&
MediaCapture.PreviewMediaCapture.CameraStreamState != CameraStreamState.Streaming)
{
// StopPreview is not idempotent, silence exception when camera is not streaming
}
await FrameReader.StopAsync();
FrameCollection.Dispose();
CollectedColorFrames.AsParallel().ForAll(frame => frame.Dispose());
CollectedNonIlluminatedInfraredFrames.AsParallel().ForAll(frame => frame.Dispose());
CollectedIlluminatedInfraredFrames.AsParallel().ForAll(frame => frame.Dispose());
CollectedColorFrames.Clear();
CollectedNonIlluminatedInfraredFrames.Clear();
CollectedIlluminatedInfraredFrames.Clear();
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, DispatcherTimer.Stop);
}
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();
}