title: enumerate MediaFoundation sink
body: <p>I am trying to build a full topology in MediaFoundation, using BlackMagic Decklink cards as sources and sinks.  In MediaFoundation, there exists an easy way to enumerate sources:</p>
  
  <pre><code>hr = MFEnumDeviceSources(pConfig, &amp;ppDevices, &amp;count);
  </code></pre>
  
  <p>But for the life of me I cannot find an easy way to enumerate the sinks on a machine, and I'm coming up empty from the official documentation.  Has anyone had any luck with this?</p>