Date: Sat, 5 Nov 2005 03:20:08 +0800 From: Ariff Abdullah <skywizard@MyBSD.org.my> To: Warner Losh <imp@bsdimp.com> Cc: multimedia@freebsd.org Subject: Re: Sound driver weirdness Message-ID: <20051105032008.384323ac.skywizard@MyBSD.org.my> In-Reply-To: <20051104.114748.71117327.imp@bsdimp.com> References: <20051104161811.4ca68aac.skywizard@MyBSD.org.my> <20051104.085348.89043521.imp@bsdimp.com> <20051105023834.5da2a41b.skywizard@MyBSD.org.my> <20051104.114748.71117327.imp@bsdimp.com>
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On Fri, 04 Nov 2005 11:47:48 -0700 (MST)
Warner Losh <imp@bsdimp.com> wrote:
>
> current from 'a while' ago. I no longer have the old kernel to know
> what exact version it was.
>
> > What makes you think channel reset isn't succeeding? Any other
> > error or diagnostic messages from syslog/console?
>
> Nope. What makes me think this is purely code inspection for the
> operation not supported by device:
>
> if (flags & FREAD) {
> ...
> /* got a channel, already locked for us */
> if (chn_reset(rdch, fmt)) {
> pcm_chnrelease(rdch);
> i_dev->si_drv1 = NULL;
> return ENODEV;
> }
> ...
> }
> if (flags & FWRITE) {
> /* open for write */
> ...
> if (!wrch)
> error = EBUSY; /* XXX Right return code? */
> else if (chn_reset(wrch, fmt))
> error = ENODEV;
> ...
>
>
> > Perhaps /dev/dsp has been acquired by something else (since your
> > vchans disabled). fstat | grep dsp. How about enabling vchans?
>
> % fstat | grep dps
> %
>
"dsp"
> Why are my vchans disabled, what does that mean and what can I do
> about it?
>
That means at most, only single process (sound apps) can acquire the
sound device (vchans = virtual channels).
1) Try enabling vchans by increasing the value of both
hw.snd.maxautovchans and hw.snd.pcm0.vchans (4 is a good start).
After that, you probably need to reduce the value of
hw.snd.pcm0.vchanrate to 44100 (only if necessary).
2) Try to use other 'simpler' apps, such as mpg321
3) hm.. I don't think my recent commit against both dsp.c/mixer.c
cause this problem (maybe?). Note that there was also a commit by
DES, so you probably need to back off dsp.c down to rev. 1.85
--
Ariff Abdullah
MyBSD
http://www.MyBSD.org.my (IPv6/IPv4)
http://staff.MyBSD.org.my (IPv6/IPv4)
http://tomoyo.MyBSD.org.my (IPv6/IPv4)
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