[wdmaudiodev] Re: Issues in installing custom sAPO.
- From: Robert Bielik <robert@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 09 Oct 2012 20:32:32 +0200
There is no supported method to create a standalone APO that attaches to arbitrary
devices. That's contrary to the philosophy. The reasons for this are sound (so to speak).
Prior to Vista, everyone and his brother was creating filter drivers to "add
value" in the audio stream. The result was a disaster for critical audio
applications. Filters fought with each other, and latency and throughput were
unpredictable. Thus, that path is no longer allowed...
<soapbox>
Which I still think is a *VERY* poor choice! Since the APOs work on buffers,
much like a DMO or DirectX pluign, the issues of latency/throughput would ONLY
be built into the algorithm/effects which the APO would be implementing, thus
being a factor that implementors would only try to optimize. Of course there
are less competent implementors, but lets face it, its not as if the APOs would
be installed in a life support system, and besides there is nothing stopping
incompetent driver developers from developing drivers that REALLY f*ck up your
system, which again is no bigger deal than to uninstalling it (possibly in safe
boot mode) and never touching the manufacturer again, even with a ten foot pole.
The ability to add arbitrary APOs would bring SO much added value to Windows,
and with a *supported* installation option, the end user would still be in full
control of what he/she wants to put their audio through.
I'm very sorry that Microsoft have taken such a very hard to understand (and
uninformed IMHO) decision on this, making developers life's so much harder
trying to accomplish things that would've been SO easy with an APO.
Thank you.
</soapbox>
/Rob
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