[wdmaudiodev] Re: MediaPlayer improves USB DPC timing
- From: "Dugan Porter" <duganp@xxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 25 Jul 2003 08:07:26 -0700
Calling timeBeginPeriod does indeed have the same effect as calling
ExSetTimerResolution. This is actually documented, albeit rather
indirectly, at this page:
http://support.microsoft.com/default.aspx?scid=kb;en-us;306828
As far as I know this is the only user-mode Windows API function that
does so.
Dugan Porter - Audio API Dev Lead - Microsoft
This posting is provided "as is" with no warranties, and confers no
rights
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of
bart@xxxxxxxxxxxxx
Sent: Friday, July 25, 2003 2:59 AM
To: Martin Puryear
Cc: WDM list; Ron Kuper
Subject: [wdmaudiodev] Re: MediaPlayer improves USB DPC timing
Hi Martin,
> MPlay32 is included in Windows; this ought to be quick'n'easy to try,
and it uses just the
> basic MCI APIs.
>
I just tried MPlay32 and it behaves the same as Cubase and Wavelab: It
only plays without
dropouts whenever the Media Player has been playing before and with the
WMP still loaded
but stopped. So it looks like the WMP sets a setting that MPlay32 does
not.... I'll start
digging into the SDK and DDK docs and look for it.
> For kernel-mode, please read the documentation on ExSetTimerResolution
in the Windows
> DDK.
>
I don't think it can be kernelmode in my driver because it is the same
driver showing
or not showing the problem depending on a user more state. Or is there a
user mode API
(in the form of an ioctl) to call ExSetTimerResolution? Sounds quite
dangerous to me
if there was....
Regards,
Bart
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