[wdmaudiodev] Re: MediaPlayer improves USB DPC timing

  • From: "bart@xxxxxxxxxxxxx" <bart@xxxxxxxxxxxxx>
  • To: RonKuper@xxxxxxxxxxxx
  • Date: Fri, 25 Jul 2003 15:24:49 +0200

Hi Ron,

> We don't have "completion routines" in SONAR, being all in user mode, but we
> do have a time critical mix thread that blocks waiting on I/O completion.  I
> suspect it piggy-backs on some of the same mechanisms.
The kernel DPC (Defered Procedure Calls) level, where the completion routines
are called in, is higher as any kernel or user thread so should have a *much*
better timing as user mode threads.

> I assume your normal test bed is WaveLab. 
and Cubase SX at the moment

> Have you verified that this change with Media Player occurs when you are 
> hosted
> in other apps, such as Sound Forge or SONAR?  In SONAR I'd be particularly 
> curious
> to see how this behaves using DirectKS instead of MME.
Not yet, I am mainly focused on ASIO at the moment (and happy that Sonar 2.2 
supports this) but will try later with DirectKS ans Sonar.

The way I see the current situation (from the users point of view) is that MME 
is ok
for playing back mp3's and that everybody who wants to do more uses ASIO. 


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