CopyTo means "copy playback data to your hardware buffer." CopyFrom means "copy record data from your hardware buffer. If you're implementing a capture driver, you need CopyFrom.
By the way, are you familiar with Virtual Audio Cable? That may already do what you want.
http://software.muzychenko.net/eng/vac.html I believe that the developer is a frequent poster here. Matt Yong Liu wrote:
I am some confused in using IDmaChannel::copyto and copyfrom. I am writing avirtual wdm audio catpute driver, since it is a virtual driver, the audio data is not from a real device, it is from an application. Which function copyto or coypfrom I should use to send the data to the driver? Thank you very much. Yong
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