Date: Mon, 11 May 1998 08:28:47 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: dwhite@resnet.uoregon.edu Cc: multimedia@FreeBSD.ORG Subject: Re: GusPNP + 2.2.6 = static Message-ID: <199805110628.IAA17323@labinfo.iet.unipi.it> In-Reply-To: <Pine.BSF.3.96.980510225832.320A-100000@gdi.uoregon.edu> from "Doug White" at May 10, 98 11:05:25 pm
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> Hello .. tsia. Upgraded to 2.2.6 today, built a new kernel with pcm0 and
> controller pnp0, finds GUS PnP okay, but cat somefile.au > /dev/audio1
> gives static. Is there something I missed?
The way i configure the CODEC on the GUS (mode 1) seems to generate
incorrect behaviour with mu-law. I cannot tell if it is a bug in the
codec (it emulates a CS423x, and the latter work fine with my
configuration) or my fault -- in mode 3, i have reports
that mu-law works fine.
I thought I fixed the problem by setting the card in 8-but unsigned and
doing the conversion in software -- not a real fix since you have only
8-bit dynamic range instead of 13, but better than nothing...
I will check and fix it in the next days.
The OPTI931 has a similar problem (sort of, since there it only
appears in full duplex operation -- probably the ulaw<->linear
section is shared between the capture and playback section).
If you want to try it, look at what is done in ad1848.c -- mss_format():
probably the line
if (d->bd_id == MD_OPTI931) {
should be changed to
if (d->bd_id == MD_OPTI931 || d->bd_id == MD_GUSPNP) {
and that should suffice.
cheers
luigi
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