Date: Sat, 25 Sep 1999 11:58:33 +0200 From: "Dave J. Boers" <djb@Wit389306.student.utwente.nl> To: morganw@engr.sc.edu Cc: freebsd-current@freebsd.org Subject: Re: pcm oddity Message-ID: <19990925115833.A54296@relativity.student.utwente.nl> In-Reply-To: <Pine.BSF.4.10.9909242348030.397-100000@volatile.by-tor.tacorp.net> References: <Pine.BSF.4.10.9909242348030.397-100000@volatile.by-tor.tacorp.net>
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On Fri, Sep 24, 1999 at 11:52:26PM -0400, Wes Morgan wrote:
> I noticed a little quirk in the pcm driver -- it is reversing the channels
> in my sb16! The first couple times I play a certain mp3 that starts out
> (normally) in the left channel, it plays correctly in the left channel.
> Then suddenly it will switch, and start out in the right channel.
> My kernel is -current as of late sept 22. Can anyone else duplicate this?
Hi,
I can reproduce your findings. I run regular buildworld every few days. I
have been having this problem for at least two weeks (and possibly before, I
have been away for a few months and was stuck with Irix). An easy way to
reproduce the problem is to start x11amp and hit play several times.
I also found several other "quirks" in the pcm driver while I was
programming:
1. If I read() from /dev/dsp in 16 bits single channel mode, I get rubbish
even if the mic and igain mixers are set to zero. If I read some 8 bits
single channel data just before you read the 16 bits data, the problem
disappears. Seems to be an initialization problem.
2. Reading large blocks from /dev/dsp (like 8192 bytes), generates a kernel
panic (uiomove failed). Cutting down the blocksize to 256 bytes appears to
solve the problem. Maybe something overflowing or a timing problem.
3. If I change the mixer setttings using ioctl() calls for /dev/dsp, then the
settings for /dev/mixer do not change accordingly.
I have an original Sb16 PnP. I am running smp for dual celeron on an Abit
mainboard.
Maybe someone wants to look into this, as I don't have any device driver
programming experience (and little time to learn also).
Best wishes,
Dave.
--
Dave J. Boers
djb@relativity.student.utwente.nl I will *NOT* read email sent to
Graduate student of Theoretical Physics d.j.boers@student.utwente.nl
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