[wdmaudiodev] Re: Issues in installing custom sAPO.
- From: Robert Bielik <robert@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 11 Oct 2012 20:06:19 +0200
Tim Roberts skrev 2012-10-11 19:07:
There is no clear and obvious path to implement general-purpose audio effects
products in Vista and beyond. That was mostly an intentional design decision.
There were so many poorly written effects in the pre-Vista world that it was
impossible to implement reliable professional audio applications.
Really ? Do you have any documentation to back up this statement ? Question is
not only for Tim but any Microsoft member of this list.
In the pre-Vista world there was only WaveCyclic and the impossibility for
reliable professional applications lay in the core of the WDM audio
implementation and more importantly, OS thread scheduling. On XP I cannot get
any reliable low latency app to work without setting process+thread to RT. Not
good, and possibly VERY unstable. With Vista++, WaveRT and reliable scheduling
with MMCSS has had that changed significantly, but that has *nothing* to do
with APOs or not.
And secondly, since the audio server functionality now is User Mode (and thus the
execution of any APO effects), as opposed to Kernel Mode in pre-Vista, there is even
lesser of a chance to mess things up! I think it is only a "convenient" route
taken by Microsoft.
/Rob
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