public void Stop()
{
if (_cancelToken != null)
{
_cancelToken.Cancel();
capGrabber = null;
}
}
public void Start()
{
//creates new instance of the cancellationtoken
_cancelToken = new CancellationTokenSource();
Task.Factory.StartNew(() =>
{
// Create new grabber
capGrabber = new CapGrabber();
capGrabber.PropertyChanged += capGrabber_PropertyChanged;
capGrabber.NewFrameArrived += capGrabber_NewFrameArrived;
var graph = Activator.CreateInstance(Type.GetTypeFromCLSID(FilterGraph)) as IGraphBuilder;
var sourceObject = FilterInfo.CreateFilter(deviceMoniker);
var grabber = Activator.CreateInstance(Type.GetTypeFromCLSID(SampleGrabber)) as ISampleGrabber;
var grabberObject = grabber as IBaseFilter;
if (graph == null)
{
return;
}
graph.AddFilter(sourceObject, "source");
graph.AddFilter(grabberObject, "grabber");
using (var mediaType = new AMMediaType())
{
mediaType.MajorType = MediaTypes.Video;
mediaType.SubType = MediaSubTypes.RGB32;
if (grabber != null)
{
grabber.SetMediaType(mediaType);
if (graph.Connect(sourceObject.GetPin(PinDirection.Output, 0), grabberObject.GetPin(PinDirection.Input, 0)) >= 0)
{
if (grabber.GetConnectedMediaType(mediaType) == 0)
{
VideoInfoHeader header = (VideoInfoHeader)Marshal.PtrToStructure(mediaType.FormatPtr, typeof(VideoInfoHeader));
capGrabber.Width = header.BmiHeader.Width;
capGrabber.Height = header.BmiHeader.Height;
}
}
graph.Render(grabberObject.GetPin(PinDirection.Output, 0));
grabber.SetBufferSamples(false);
grabber.SetOneShot(false);
grabber.SetCallback(capGrabber, 1);
}
// Get the video window
var wnd = (IVideoWindow)graph;
wnd.put_AutoShow(false);
// Create the control and run
var control = (IMediaControl)graph;
control.Run();
// Wait for the stop signal
var stopSignal = new ManualResetEventSlim(false);
using (_cancelToken.Token.Register(stopSignal.Set))
stopSignal.Wait();
// Stop when ready
control.StopWhenReady();
capGrabber = null;
}
}, _cancelToken.Token);
}
