[wdmaudiodev] Re: Applying custom effects to audio input
- From: Tim Roberts <timr@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 12 Sep 2017 10:49:25 -0700
Antoine Cochet wrote:
I would like to build a custom sAPO, to be able to apply various
effects in real time to any microphone input.
Moreover, the effects would have to be placed in the audio stack in a
way that it is applied to all user applications.
I already dispose of the different algorithms to apply.
First of all, where in the audio stack should be applied and how? I've
been thinking about implementing it as an Endpoint Effect or Mode Effect.
Is there any corresponding sample of inf file or sample code for that
matter? I've tried the SYSVAD and sysfx samples but they didn't
correspond to my problem.
Microsoft does not support the ability to have a single APO that works
for arbitrary devices. APOs are considered an extension of the
hardware. They are installed in the INF for the hardware, and work only
with that hardware. If you are working with a hardware vendor, you can
have them ship your APO as a "value add", but you can't ship an APO by
itself.
Part of the reason for the new Audio Engine architecture in Vista is
that the old architecture made it way too easy to install filters, and
pretty soon computers were so bogged down with expert value-add hyped-up
audio filters that professional audio devices couldn't get anything
done. Thus, doing that is now a lot harder.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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