Below is Microsoft's official project to demo how to make audio driver. https://github.com/microsoft/Windows-driver-samples/tree/master/audio/sysvad
After making build, 3 APO dll files are generated. And those inf files contain the installation steps for them.
But I tested and found that those apo effects do not take effect at all.
My test method is:
I empty all the codes of APOProcess() in those 3 APO and found that audio recorded is not influenced.
Question 1： My understanding is that these APO dlls must be invoked by some programs and then we could have sound effects. While sysvad does not provide such programs. Am I right？
Question 2： I want to know how do those APO codes interact with sysvad microphone driver? By code, or by some id in the inf file?
Question 3: Furthermore, if I want to reuse the APO codes for other microphone device driver, is it possible and how to modify them? E.g. for my realtek device driver which I have no source code.
Thanks!