Latency in Windows (was Re: PD symbols with funny characters)

Karl MacMillan karlmac at
Tue Dec 5 23:31:49 CET 2000


Well, you are most likely right.  In theory manufacturers are supposed to
implement a miniport driver (is that the right name?) and they then get
directX and all of the other drivers (including ASIO) for 'free'.  The
problem is that miniport drivers are below the kmixer level and therefore
go through all of the Microsoft crap.  I assume that what RME (and
probably quite a few other manufacturs) have done is make their ASIO
drivers talk directly to their custom kernel drivers.  Arghh . . . all of
this wouldn't be necessary if Microsoft had done things right the first
time.  Of course I have a service pack that fixes all of these Windows
problems - it is called linux!


On Tue, 5 Dec 2000, Alessandro Fogar wrote:

> I think that the way to go for professional audio in Windows is Steinberg
> DirectX is for multimedia and games, not professional audio.
> The RME for example has very good ASIO drivers but no DirectX direct drivers
> (you can see it under DirectX with 'emulated drivers').
> But I don't know how we can then distribute the sources of the application
> which uses the ASIO Api sdk.
> Bye
> Alessandro Fogar
> ----- Original Message -----
> From: "Karl MacMillan" <karlmac at>
> To: <pd-list at>
> Sent: Monday, December 04, 2000 9:22 PM
> Subject: Re: PD symbols with funny characters
> > On Mon, 4 Dec 2000, Miller Puckette wrote:
> >
> > > Yep, spaces are hard to get into symbols...  I'm thinking someday about
> > > allowing symbols within quotes like "this symbol has 4 spaces" but I
> think
> > > there are more urgent problems for me to face (like latency in Windows).
> > >
> >
> > Do you have an idea about how to handle the latency problem in Windows?
> > I know that they claim that the drivers/schedular can handle 5ms latency
> > (for DirectX) but this requires circumventing the 'kmixer', which
> > essentially means using a driver specific work around.  Do you know of a
> > more standard way to do this?

| Karl W. MacMillan                                 |
| Computer Music Department                         |
| Peabody Institute of the Johns Hopkins University |
| karlmac at                           |
|                      |

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