.Net code to capture HDMI input from external device

I have a pet project I want to write that would require a .Net application to be able to capt开发者_运维知识库ure a video stream from an HDMI input into the PC. I see capture h/w devices out there that will allow for HDMI input, but these normally come with their own software for the client. Is there a h/w appliance that will allow me stream via HDMI into my PC and then capture that stream directly using .Net? Or, is there a different approach that I should be looking for?

The important part is that I want to get the video stream from an external video source that outputs via HDMI into a .Net application on my PC.

Thanks Neil