How to read/access hdmi Input frame buffer using Directx?

I am trying to capture hdmi Input frame buffer using DirectX in windows. I have been able to find the examples to capture the video frame or stream from a camera using DIRECT X. However I have not been able to find any resource that can help me to read the HDMI IN frame buffer using DIRECT X. Moreover, I know that HDMI content is HDCP protected. It cannot be decoded without a capture card. I have one with me from startech.com but I don't know how to use the video capture card in DIRECT X and capture the frames and process them. Any suggestions to achieve this will be really appreciated.