[wdmaudiodev] Re: Is a WDM kernel streaming driver right for our application?
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 30 Aug 2002 14:52:27 +1000
Tim,
From my experience (limited as it may be), the biggest killer is the latency
in firing off deferred procedure calls at Dispatch level - this is
frequently greater than 10ms but I don't think I've ever seen it exceed
40ms.
Jeff
----- Original Message -----
From: "Sauerwein, Tim" <tims@xxxxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Friday, August 30, 2002 3:05 AM
Subject: [wdmaudiodev] Is a WDM kernel streaming driver right for our
application?
>
> Hello Friends,
>
> My company is considering a project that uses an MS Windows PC for
> real-time signal processing of an audio stream. The input arrives over
USB,
> and the output also leaves over USB. We can tolerate some latency, but we
> must keep a steady output rate and never miss a sample.
>
> We think of using a real-time extension to Windows, and building a
> real-time system that is designed to meet its deadlines always. But we
> also wonder if a WDM kernel streaming driver might work just as well.
>
> So I am delighted to have come across the community of experts in
> WDMAUDIODEV, and I seek your advice. In particular:
>
> (1) What things can cause Windows to switch away from a kernel
> streaming driver for long enough to make it miss a sample? How likely
> are such things to occur in practice?
>
> (2) What is the practical limit to how much of the CPU the streaming
> driver can consume, and still have confidence that the driver will not
> miss samples?
>
> (3) How much will our customers have to tune their PCs to make our
> solution work right? (We think of establishing minimum requirements for
> the PC.)
>
> (4) We are competent real-time programmers, but new to streaming
> drivers. Will there be lots of subtle issues that we might not expect?
>
> Thanks in advance for any help.
>
> - Tim
>
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