How to implete a pcie video and audio capture card base on avstream

Question

I need to develop a video and audio capture driver base on avstream.my card has an hdmi input,it has video and audio data at the same time.
I refer to avstream's sample code avshws, and implement video capture, I can use obs to show the capture video data,but how to add an audio at the same time?I think the audio must bind to the video,I read all the microsoft onlink doc and sample code, but i can't find any reference and usable document.
I have read many microsoft document, but no usable information, the document is too brief.Any body known how to implement this, please give me an answer, thanks a lot!