private static bool AddBranchToPartialTopology(Topology topology, MediaSource source, PresentationDescriptor descriptor, int streamIndex, IntPtr hVideoWnd)
{
StreamDescriptor?streamDescriptor = null;
Activate? activate = null;
TopologyNode? sourceNode = null, outputNode = null;
try
{
streamDescriptor = descriptor.GetStreamDescriptorByIndex(streamIndex, out var isSelected);
if (isSelected)
{
CreateMediaSinkActivate(descriptor, streamDescriptor, streamIndex, hVideoWnd, out activate);
if (activate != null)
{
var sourceNodePtr = Marshal.AllocHGlobal(Marshal.SizeOf(source));
MediaFactory.CreateTopologyNode(TopologyType.SourceStreamNode, out sourceNode);
sourceNode.Object = source;
topology.AddNode(sourceNode);
MediaFactory.CreateTopologyNode(TopologyType.OutputNode, out outputNode);
outputNode.Object = activate;
topology.AddNode(outputNode);
sourceNode.ConnectOutput(0, outputNode, 0);
return(true);
}
else
{
return(false);
}
}
else
{
return(false);
}
}
catch (SharpDXException ex)
{
Debug.Print(ex.ToString());
return(false);
}
finally
{
streamDescriptor?.Dispose();
activate?.Dispose();
sourceNode?.Dispose();
outputNode?.Dispose();
}
}
public void Load(object customSource)
{
Close();
AfterClose();
if (Hwnd == IntPtr.Zero)
{
throw new InvalidOperationException();
}
Trace.WriteLine("HwndRenderSession::Load()");
MediaSource source = null;
Topology topo = null;
PresentationDescriptor pdesc = null;
try {
// Create MediaSource(check argument)
source = ComObject.As <MediaSource>(Marshal.GetIUnknownForObject(customSource)); // GetIUnknownForObject adds reference count
// Create MediaSession
MediaFactory.CreateMediaSession(null, out _mediaSession);
_callback = new MediaSessionCallback(_mediaSession, OnMediaEvent);
// Create Topology
MediaFactory.CreateTopology(out topo);
// Get PresentationDescriptor from MediaSource
source.CreatePresentationDescriptor(out pdesc);
// Connect each stream
for (var i = 0; i < pdesc.StreamDescriptorCount; i++)
{
RawBool isSelected;
using (var sdesc = pdesc.GetStreamDescriptorByIndex(i, out isSelected)) {
if (!isSelected)
{
continue;
}
Activate renderer = null;
TopologyNode srcnode = null;
TopologyNode outnode = null;
try {
// Renderer
if (sdesc.MediaTypeHandler.MajorType == MediaTypeGuids.Video)
{
MediaFactory.CreateVideoRendererActivate(Hwnd, out renderer);
}
else if (sdesc.MediaTypeHandler.MajorType == MediaTypeGuids.Audio)
{
MediaFactory.CreateAudioRendererActivate(out renderer);
}
else
{
// not supported
continue;
}
// Source Node
MediaFactory.CreateTopologyNode(TopologyType.SourceStreamNode, out srcnode);
srcnode.Set(TopologyNodeAttributeKeys.Source, source);
srcnode.Set(TopologyNodeAttributeKeys.PresentationDescriptor, pdesc);
srcnode.Set(TopologyNodeAttributeKeys.StreamDescriptor, sdesc);
// Output Node
MediaFactory.CreateTopologyNode(TopologyType.OutputNode, out outnode);
outnode.Object = renderer;
// Connect
topo.AddNode(srcnode);
topo.AddNode(outnode);
srcnode.ConnectOutput(0, outnode, 0);
} finally {
srcnode?.Dispose();
outnode?.Dispose();
renderer?.Dispose();
}
}
}
// Set to session
_mediaSession.SetTopology(SessionSetTopologyFlags.None, topo);
} catch {
Close();
AfterClose();
throw;
} finally {
pdesc?.Dispose();
topo?.Dispose();
source?.Dispose();
}
}