DDA grabber: Set a 500ms timeout when waiting for a new frame (#1753)

* Add a DXDI DDA grabber

* Change all names to camel case

* Handle cropping and pixel decimation

* Try more persistently to restart capture after an error occurred.

These can happen when changing resolution, or resuming from sleep.

* Set a 500ms timeout when acquiring a frame.

The API won't give us a new frame if nothing on the screen has changed,
so an INFINITE timeout means we'll wait forever in this case, and
eventually the LED connection will timeout.

---------

Co-authored-by: LordGrey <[email protected]>

libsrc/grabber/dda/DDAGrabber.cpp

@@ -174,7 +174,7 @@ int DDAGrabber::grabFrame(Image<ColorRgb> &image)
 	// Acquire the next frame.
 	CComPtr<IDXGIResource> desktopResource;
 	DXGI_OUTDUPL_FRAME_INFO frameInfo;
-	hr = d->desktopDuplication->AcquireNextFrame(INFINITE, &frameInfo, &desktopResource);
+	hr = d->desktopDuplication->AcquireNextFrame(500, &frameInfo, &desktopResource);
 	if (hr == DXGI_ERROR_ACCESS_LOST || hr == DXGI_ERROR_INVALID_CALL)
 	{
 		if (!restartCapture())
@@ -185,7 +185,7 @@ int DDAGrabber::grabFrame(Image<ColorRgb> &image)
 	}
 	if (hr == DXGI_ERROR_WAIT_TIMEOUT)
 	{
-		// This shouldn't happen since we specified an INFINITE timeout.
+		// Nothing changed on the screen in the 500ms we waited.
 		return 0;
 	}
 	RETURN_IF_ERROR(hr, "Failed to acquire next frame", 0);