/// <summary>
/// Displays property page for crossbar if it's available.
/// </summary>
/// <param name="hwndOwner">The window handler for to make it parent of property page.</param>
/// <seealso cref="CrossbarAvailable"/>
public void DisplayPropertyPage_Crossbar(IntPtr hwndOwner)
{
if (DX.Crossbar == null)
return;
DisplayPropertyPageFilter((IBaseFilter)DX.Crossbar, hwndOwner);
// update VideoInput - it can be changed
_VideoInput = GetCrossbarInput(DX.Crossbar);
}
/// <summary>
/// Gets type of input connected to video output of the crossbar.
/// </summary>
/// <param name="crossbar">The crossbar of device.</param>
/// <returns>Video input of device</returns>
/// <seealso cref="CrossbarAvailable"/>
private static VideoInput GetCrossbarInput(IAMCrossbar crossbar)
{
VideoInput videoInput = VideoInput.Default;
int inPinsCount, outPinsCount;
// gen number of pins in the crossbar
if (crossbar.get_PinCounts(out outPinsCount, out inPinsCount) == 0)
{
int videoOutputPinIndex = -1;
int pinIndexRelated;
PhysicalConnectorType type;
// find index of the video output pin
for (int i = 0; i < outPinsCount; i++)
{
if (crossbar.get_CrossbarPinInfo(false, i, out pinIndexRelated, out type) != 0)
continue;
if (type == PhysicalConnectorType.Video_VideoDecoder)
{
videoOutputPinIndex = i;
break;
}
}
if (videoOutputPinIndex != -1)
{
int videoInputPinIndex;
// get index of the input pin connected to the output
if (crossbar.get_IsRoutedTo(videoOutputPinIndex, out videoInputPinIndex) == 0)
{
PhysicalConnectorType inputType;
crossbar.get_CrossbarPinInfo(true, videoInputPinIndex, out pinIndexRelated, out inputType);
videoInput = new VideoInput(videoInputPinIndex, inputType);
}
}
}
return videoInput;
}
/// <summary>
/// Sets type of input connected to video output of the crossbar.
/// </summary>
/// <param name="crossbar">The crossbar of device.</param>
/// <param name="videoInput">Video input of device.</param>
/// <seealso cref="CrossbarAvailable"/>
private static void SetCrossbarInput(IAMCrossbar crossbar, VideoInput videoInput)
{
if (videoInput.Type != VideoInput.PhysicalConnectorType_Default &&
videoInput.Index != -1)
{
int inPinsCount, outPinsCount;
// gen number of pins in the crossbar
if (crossbar.get_PinCounts(out outPinsCount, out inPinsCount) == 0)
{
int videoOutputPinIndex = -1;
int videoInputPinIndex = -1;
int pinIndexRelated;
PhysicalConnectorType type;
// find index of the video output pin
for (int i = 0; i < outPinsCount; i++)
{
if (crossbar.get_CrossbarPinInfo(false, i, out pinIndexRelated, out type) != 0)
continue;
if (type == PhysicalConnectorType.Video_VideoDecoder)
{
videoOutputPinIndex = i;
break;
}
}
// find index of the required input pin
for (int i = 0; i < inPinsCount; i++)
{
if (crossbar.get_CrossbarPinInfo(true, i, out pinIndexRelated, out type) != 0)
continue;
if ((type == videoInput.Type) && (i == videoInput.Index))
{
videoInputPinIndex = i;
break;
}
}
// try connecting pins
if ((videoInputPinIndex != -1) && (videoOutputPinIndex != -1))
{
if (crossbar.CanRoute(videoOutputPinIndex, videoInputPinIndex) == 0)
{
int hr = crossbar.Route(videoOutputPinIndex, videoInputPinIndex);
DsError.ThrowExceptionForHR(hr);
}
else
{
throw new Exception("Can't route from selected VideoInput to VideoDecoder.");
}
}
else
{
throw new Exception("Can't find routing pins.");
}
}
}
}
/// <summary>
/// Adds crossbar filter to the filter graph.
/// </summary>
private void AddFilter_Crossbar()
{
// NOTE: It's hard to add suitable crossbar manually
// It's easy to add it by using ICaptureGraphBuilder2
// This way seems to be ugly (and it totally is)
// but it's Microsoft's recommended approach
// See http://msdn.microsoft.com/en-us/library/windows/desktop/dd390973%28v=vs.85%29.aspx
// --------------------------------------------------
int hr = 0;
DX.Crossbar = null;
ICaptureGraphBuilder2 graphBuilder = null;
try
{
graphBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
// set filter graph to the capture graph builder
hr = graphBuilder.SetFiltergraph((IGraphBuilder)DX.FilterGraph);
DsError.ThrowExceptionForHR(hr);
// get crossbar object to to allows configuring pins of capture card
object crossbarObject = null;
graphBuilder.FindInterface(FindDirection.UpstreamOnly, Guid.Empty, DX.CaptureFilter, typeof(IAMCrossbar).GUID, out crossbarObject);
if (crossbarObject != null)
{
DX.Crossbar = (IAMCrossbar)crossbarObject;
}
}
finally
{
SafeReleaseComObject(graphBuilder);
graphBuilder = null;
}
// check is crossbar is needed
if (DX.Crossbar != null)
{
hr = DX.FilterGraph.AddFilter((IBaseFilter)DX.Crossbar, "Crossbar");
DsError.ThrowExceptionForHR(hr);
// Route Crossbar's inputs
SetCrossbarInput(DX.Crossbar, _VideoInput);
_VideoInput = GetCrossbarInput(DX.Crossbar);
}
}
