Date: Mon, 05 Jul 1999 13:25:34 +0800 From: Stephen Hocking-Senior Programmer PGS Tensor Perth <shocking@prth.pgs.com> To: luigi@labinfo.iet.unipi.it Cc: multimedia@freebsd.org Subject: Mods to snd drivers Message-ID: <199907050525.NAA25530@ariadne.tensor.pgs.com>
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I've finnaly moved from my old PAS16 (which I used under the Voxware drivers)
to a PnP CS4236 clone. This works fine (once I told the BIOS that I *didn't*
have a PnP OS). However, some niceties that I was used to under the Voxware
drivers are not there - to wit
a) Setting the queue size on DST_SETFRAGSIZE
b) DSP_{SET,GET}TRIGGER
c) Doing the mmap thing with an ioctl.
It's obvious which application the last two are for 8^). However, a) is useful
for dropping the latency for things like network telephones, which the
full-duplex nature of the card & drivers is otherwise suited to. I see that
you have the dma cycling around a 64k buffer. If we can't make the buffer
small that DMA cycles around, would it be possible to approach this by
changing the insertion point for writes?
Stephen
--
The views expressed above are not those of PGS Tensor.
"We've heard that a million monkeys at a million keyboards could produce
the Complete Works of Shakespeare; now, thanks to the Internet, we know
this is not true." Robert Wilensky, University of California
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