Use CreateFreeThreaded instead of Create in SimpleCapture

Author: robmikh

Win32CaptureSample/SimpleCapture.cpp

@@ -36,12 +36,12 @@ SimpleCapture::SimpleCapture(
     m_swapChain = util::CreateDXGISwapChain(m_d3dDevice, static_cast<uint32_t>(m_item.Size().Width), static_cast<uint32_t>(m_item.Size().Height),
         static_cast<DXGI_FORMAT>(m_pixelFormat), 2);
 
-    // Creating our frame pool with 'Create' instead of 'CreateFreeThreaded'
-    // means that the frame pool's FrameArrived event is called on the thread
-    // the frame pool was created on. This also means that the creating thread
-    // must have a DispatcherQueue. If you use this method, it's best not to do
-    // it on the UI thread. 
-    m_framePool = winrt::Direct3D11CaptureFramePool::Create(m_device, m_pixelFormat, 2, m_item.Size());
+    // We use 'CreateFreeThreaded' instead of 'Create' so that the FrameArrived
+    // event fires on a thread other than our UI thread. If you use the 'Create' 
+    // method, it's best not to do it on the UI thread. Using the 'Create' method
+    // also means you must have a DispatcherQueue on that thread and you must be
+    // pumping messages.
+    m_framePool = winrt::Direct3D11CaptureFramePool::CreateFreeThreaded(m_device, m_pixelFormat, 2, m_item.Size());
     m_session = m_framePool.CreateCaptureSession(m_item);
     m_lastSize = m_item.Size();
     m_framePool.FrameArrived({ this, &SimpleCapture::OnFrameArrived });