[host] added initial framework for DXGI capture

host/CaptureFactory.h

@@ -21,14 +21,37 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #define W32_LEAN_AND_MEAN
 #include <Windows.h>
 
+#include "common\debug.h"
 #include "ICapture.h"
 #include "Capture\NvFBC.h"
+#include "Capture\DXGI.h"
 
 class CaptureFactory
 {
 public:
   static ICapture * GetCaptureDevice()
   {
-    return new Capture::NvFBC();
+    ICapture *dev;
+
+    dev = new Capture::NvFBC();
+    if (dev->Initialize())
+    {
+      DEBUG_INFO("Using NvFBC");
+      return dev;
+    }
+    dev->DeInitialize();
+    delete dev;
+    
+    dev = new Capture::DXGI();
+    if (dev->Initialize())
+    {
+      DEBUG_INFO("Using DXGI");
+      return dev;
+    }
+    dev->DeInitialize();
+    delete dev;
+
+    DEBUG_ERROR("Failed to initialize a compatible capture device");
+    return NULL;
   }
 };