[wdmaudiodev] Re: Issues in installing custom sAPO.
- From: Robert Bielik <robert@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 12 Oct 2012 06:46:33 +0200
Hello Frank,
Frank Yerrace skrev 2012-10-11 22:02:
...Windows has no model for a third player to be involved...
What about the Microsoft Global FX which anyways need to be wrapped by any APO
? One of those could have had the option to control third party installed DMOs
for instance, and thus it would still be under full control of both
applications (through some WASAPI interface) and the user via sound control
panel. I can see no problem with such an approach.
Even just having these two controlling entities has caused problems in some
(important) user scenarios.
Any important scenario regarding professional audio applications pre-Vista
involves ASIO, and thus has nothing to do with APOs. With Vista++, things may
have changed a bit though, but I have a hard time getting my head around what
the problem is, so a short use-case to back that statement up would be
appreciated.
Thanks
/Rob
Frank Yerrace
Microsoft Corporation
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Bielik
Sent: Thursday, October 11, 2012 11:06 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Issues in installing custom sAPO.
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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