On 2/14/06, Istvan Varga <istvan_v@fibermail.hu> wrote:
> On Tuesday 14 February 2006 20:59, Ben McAllister wrote:
>
> > 1) "The default is 1024" - is this default (and other cmdline
> > defaults) taken from SOLELY from .csoundrc, or is there another spot
> > in addition to .csoundrc where these are defined i.e somewhere in the
> > source?
>
> The defaults are in the source code, and depend on platform. For example,
> -B really defaults to 1024 on Linux, but the default is 4096 on MacOS X,
> and 16384 on Windows (so that MME on Win9x will not have dropouts).
> Of course, the settings in .csoundrc (if any) override these, and you can
> set there whatever "default" you like.


Hmm - ok thanks for the clarification.  Could you point me to the file
in the source where these are defined?

>
> > If so, could we externalize it all to .csoundrc?
>
> So, what would happend then if .csoundrc is removed ? Some defaults
> do need to be present in the source code.

Good point re: the removal of .csoundrc.  I was thinking it could be
auto-gen'd if not present.

>
> > 2) I alluded to this question before, but now I'll ask it outright:
> > what is the expected behavior, on Windows, for the interaction between
> > the control panel/driver for a given device, and this -B option.  I
> > would expect the DMA buffer size for my device to be controlled by
> > this setting, and it SOUNDS like it is, though the Control Panel UI
> > for two different sound cards fails to update.
>
> In the case of PortAudio, the -B parameter (more precisely, -B / sr) is
> passed as the "suggested latency" value. Other than that, Csound has no
> control over how PortAudio interprets the parameter.

Thanks - I think this is worth putting into the manual, personally.
b