[wdmaudiodev] Re: FW: Re: newbie questions

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Tue, 12 Oct 2010 10:09:11 -0700

For verifying what?

> It seems I have to either implement AVStream driver and fight the
> system or implement SysFx APO module and limit the demonstrator to
> Vista and beyond.

That is the blessed approach, yes.

> I have discovered that a big US audio company recently released a
> piece of software demonstrating their audio features using what I
> think is an avstream driver. The demonstrator runs on Vista and win7.
> By simple search in the binary .sys file I have verified that it
> imports KsInitializeDriver. So although it may be a complex task to
> develop a working avstream driver it might still be feasible...

Maybe.  In a WaveRT driver, which is how most HDAudio devices are
supported in Vista and Win 7, the kernel driver does not get involved at
all in the transmission of audio data.  The audio engine process in
user-mode copies data into a circular buffer and moves the pointers on
its own.  In that case, it's not clear there's anything for you to filter.

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.


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