[wdmaudiodev] Re: newbie questions about filter drivers
- From: dprado@xxxxxxxxxxxxxx
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Mon, 18 Oct 2004 16:26:12 -0200
Ok, I guess it is time to do more reading on the subject :) . Thank you all for
the informmation on the subject. Slowly I will fill in the gaps and have a
better understanding of wdm audio drivers.
Dimitri
> I think you misunderstand the way driver stacks work. No one talks
> directly to an audio function driver. There are a vast number of
> drivers in between XYZ and user-mode: sysaudio.sys, wdmaud.sys,
> stream.sys, etc. API requests always go into the top of the driver
> stack, not into the middle.
>
> The combination of XYZ+ABC (plus the upper layers) is only going to be a
> single audio device, no matter how you filter it, and even if both of
> them are function drivers. How had you planned to switch the filtering
> on and off? You could have a magic registry entry somewhere that your
> filter driver reads on a regular basis, but that will just alter the
> behavior of your one audio device. You won't create a second device
> that way.
>
> You could possibly create a second PDO, making your filter into a bus
> driver, but then you'd be talking about mixing.
>
> --
> - Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.
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