Date: Thu, 21 Feb 2002 19:46:26 -0000 From: "cameron grant" <gandalf@vilnya.demon.co.uk> To: "Martin Faxr" <gmh003532@brfmasthugget.se>, <Danovitsch@Danovitsch.dnsq.org> Cc: <multimedia@FreeBSD.org> Subject: Re: No FM synthesizer in PCI soundblasters? Message-ID: <028101c1bb10$72ebee60$4004020a@haveblue> References: <02022118511701.03193@FreeBSD.Danovitsch.LAN> <20020221190157.7be685b2.gmh003532@brfmasthugget.se>
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> I'm not quite sure... It should definitely be in 4.5-RELEASE, and I think
> 4.4-RELEASE too. You could try searching the CVS logs or asking Cameron
Grant.
use 4.5.
> > But I would still prefere to use a FM synthesizer for this job, since I
only
> > want some beep's.
> > Having the kernel mix two streams into one looks to me as a waste of
> > CPU-cycles on the Pentium-133 I set up for this job, if it is also
possible
> > to just turn on/off a simple tone and let the soundblaster take care of
the
> > mixing...
>
> Actually, I think that FM synthesizer support in -STABLE isn't really
mature,
> if it even exists at all (although I'm not 100% sure, perhaps you'd be
better
> off asking Cameron Grant here too).
there is no fm synth support in -stable. not that that matters, since none
of the pci soundblasters contain an fm synth. they do have a secondary
playback channel which is intended to be used for cpu-generated fm which
could be used as a general second playback channel but we don't use it for
some reason. if anyone wants to extend the driver, i can provide hardware
docs.
> I don't think the vchan mixing will waste too many CPU cycles, if the
upgrade
> isn't a problem.
i haven't tested on a p133- my slowest testbox is a dual p2/300- but i'd be
very surprised if the overhead was more than 2% cpu time for 4 channels. if
you were to extend the driver as above, there would be no overhead.
-cg
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