private void DoCrossbarOperation(string deviceName, CrossbarCallback callback)
{
IGraphBuilder graphBuilder = null;
ICaptureGraphBuilder2 captureGraphBuilder = null;
IBaseFilter theDevice = null;
try
{
graphBuilder = (IGraphBuilder) new FilterGraph();
captureGraphBuilder = (ICaptureGraphBuilder2) new CaptureGraphBuilder2();
theDevice = CreateFilter(FilterCategory.VideoInputDevice, deviceName);
// Attach the filter graph to the capture graph
int hr = captureGraphBuilder.SetFiltergraph(graphBuilder);
DsError.ThrowExceptionForHR(hr);
// Add the Video input device to the graph
hr = graphBuilder.AddFilter(theDevice, "source filter");
DsError.ThrowExceptionForHR(hr);
// Render any preview pin of the device
hr = captureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, theDevice, null, null);
DsError.ThrowExceptionForHR(hr);
IAMCrossbar crossbar = null;
object o;
hr = captureGraphBuilder.FindInterface(null, null, theDevice, typeof(IAMCrossbar).GUID, out o);
if (hr >= 0)
{
crossbar = (IAMCrossbar)o;
o = null;
if (crossbar != null)
{
callback(crossbar);
return;
}
}
callback(null);
}
finally
{
Marshal.ReleaseComObject(theDevice);
Marshal.ReleaseComObject(graphBuilder);
Marshal.ReleaseComObject(captureGraphBuilder);
}
}
private static void DoCrossbarOperation(string deviceName, CrossbarCallback callback)
{
IGraphBuilder graphBuilder = null;
ICaptureGraphBuilder2 captureGraphBuilder = null;
IBaseFilter theDevice = null;
try
{
graphBuilder = (IGraphBuilder)new FilterGraph();
captureGraphBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
theDevice = CreateFilter(FilterCategory.VideoInputDevice, deviceName);
// Attach the filter graph to the capture graph
int hr = captureGraphBuilder.SetFiltergraph(graphBuilder);
DsError.ThrowExceptionForHR(hr);
// Add the Video input device to the graph
hr = graphBuilder.AddFilter(theDevice, "source filter");
DsError.ThrowExceptionForHR(hr);
// Render any preview pin of the device
hr = captureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, theDevice, null, null);
DsError.ThrowExceptionForHR(hr);
IAMCrossbar crossbar = null;
object o;
hr = captureGraphBuilder.FindInterface(null, null, theDevice, typeof(IAMCrossbar).GUID, out o);
if (hr >= 0)
{
crossbar = (IAMCrossbar)o;
o = null;
if (crossbar != null)
{
callback(crossbar);
return;
}
}
callback(null);
}
finally
{
Marshal.ReleaseComObject(theDevice);
Marshal.ReleaseComObject(graphBuilder);
Marshal.ReleaseComObject(captureGraphBuilder);
}
}
