[linux-audio-dev] SBLive again

Josh Green jgreen at users.sourceforge.net
Mon May 19 22:36:01 UTC 2003

I'm CC'ing the ALSA devel list, perhaps someone there has some answers
concerning pops/clicks with full duplex and SB Live cards.

On Mon, 2003-05-19 at 18:42, Tarragon Allen wrote:
> On Tuesday 20 May 2003 08:49, Josh Green wrote:
> > The problem that I mentioned, in regard to full duplex, doesn't relate
> > to clipping I don't think. From what I experienced I think its a problem
> > with the record and playback buffers getting out of sync (like say if
> > you tried to do full duplex with 2 different sound cards). Things would
> > be perfectly fine, then a few little pops and clicks which would
> > gradually get worse until an overrun occurs, then back to being okay
> > again (sometimes I would do something to purposefully cause an overrun,
> > to get things synchronized again). As far as I can tell this is probably
> > an ALSA problem, although my tests using OSS were inconclusive (or to
> > rephrase, I can't remember :) I think the OSS SB Live drivers might be
> > able to do full duplex, would be interested to test it again to see if
> > it is indeed an ALSA specific problem. What version of ALSA are you
> > using Lukas?  Cheers.
> > 	Josh Green
> Just for reference, I'm seeing the same behaviour using Ardour. The pops and 
> clicks only occur when I'm recording, and yes, I'm using full duplex mode. If 
> I turn off record mode the symptoms dissappear, and reappear as soon as I go 
> to record again - until there is a very minor xrun and it all clears up for a 
> while (usually about 15-20 minutes between instances, that I've noticed).
> Alsa 0.9.2, SBLive! Value, Kernel 2.4.20.

Okay, it was like 2 years ago when I was complaining about this same
problem. Just wanted to make sure it was indeed a new version of ALSA.

> t

	Josh Green

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