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 void FrameCollection_CollectionProgressed(ExampleMediaFrameCollection sender, ExampleMediaFrameCollectionProgressedEventArgs args)
{
if (IsCollectionCompleted)
{
// Discard extraneous frames
args.Frame.Dispose();
return;
}
if (args.Frame.SourceKind == MediaFrameSourceKind.Color)
{
CollectedColorFrames.Add(args.Frame);
}
else if (args.Frame.SourceKind == MediaFrameSourceKind.Infrared)
{
if (args.Frame.IsIlluminated == true)
{
CollectedIlluminatedInfraredFrames.Add(args.Frame);
}
else
{
CollectedNonIlluminatedInfraredFrames.Add(args.Frame);
}
}
else
{
// Don't know how to handle, discard
args.Frame.Dispose();
}
if (IsCollectionCompleted)
{
FrameCollection.CollectionProgressed -= FrameCollection_CollectionProgressed;
await WriteToDiskAsync();
await StopOperationAsync();
}
}