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Getting a bitmap from DirectShow

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I have a program that plays a video with the direct show VMR9 windowless control. I'm trying to get each frame as it plays so that I can sample the pixels for movement. The windowless control has a method for getting the current image:
HRESULT GetCurrentImage(
  BYTE**  lpDib
I want to use this method, but I'm not sure exactly how to use the data that the method provides. MSDN gives a start for how to do this:
BYTE *lpDib = NULL;
hr = pWindowlessControl->GetCurrentImage(&lpDib);
if (SUCCEEDED(hr))
    /* .... */
and thats nice but... it doesn't explain how to get the actual pixel data from the bitmap. I've tried looking at other documentation but there don't seem to be any good examples for this. How can I get the pixel data from this bitmap?

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