[wdmaudiodev] Re: Problem using multimedia timers
- From: timr@xxxxxxxxx
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sun, 31 May 2009 21:58:13 -0700
On Sun, May 31, 2009 at 05:40:35PM -0400, Lokesh Patakolusu wrote:
>
> I am trying to use multimedia timers for audio synchronization.I am trying
> to get
> event every 20 ms so that i can fill up the audio buffer for the driver
> to play.I wrote a test app to see how the multimedia timers work.I am
> trying to
> print the time intervals . when i start other applications on vista
> the timing interval gets affected.It shows 26, 45 ms etc even though it is
> set to 20ms.
> Pls let me know why its happening so if anybody have idea.
Sure -- it's because Windows is not a real-time operating system. There
are no latency guarantees.
> Can we depend on multimedia timers for the events for the audio
> applications.
Did you use timeBeginPeriod to set the timer resolution down? The
downside of that approach is that it uses more CPU.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boeklheide, Inc.
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