[wdmaudiodev] Re: WavePCI issue with multiple processors
- From: "Jerry Evans" <jerry@xxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 27 Mar 2007 12:32:52 +0100
Hi Jeff
Sorry to hj your thread - I've a question about Vista Core Audio and
Exclusive mode. Does your test app create its notification event set up in
manual or auto-reset mode? And does this impact your driver at all?
The docs are unclear and no one else seems to know!
Thx
Jerry.
----- Original Message -----
From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Tuesday, March 27, 2007 2:58 AM
Subject: [wdmaudiodev] Re: WavePCI issue with multiple processors
Hi Eugene,
A probability of that a new mapping becomes available exactly within
this window, is almost zero.
You're right, of course. I was thinking I had to reacquire my spin lock
after the unsuccessful call to GetMapping, but looking at it now, that's
not necessary, and I can just call InterlockedDecrement on my
InAcquisitionLoop variable and exit.
And a well-optimized driver itself cannot guarantee that all Windows
audio subsystems will function quickly and reliably. Even DirectSound
with hardware buffers introduces a significant overhead and software
buffers and/or MME introduce much more overhead. So you can achieve a
reproducible high performance only if your well-optimized application
uses your well-optimized audio driver directly via its wave/topology
interfaces.
For this particular application, I'm using the Vista Core Audio API in
exclusive mode, and this was when some of the wrinkles in my WavePCI
drivers started showing up. I'm now using your suggestion with the
interlocked InAcquisitionLoop variable and so far it's all hanging in
there!
Thanks for your help.
Jeff
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