[linux-audio-dev] SBLive again

Tarragon Allen lists at n12turbo.com
Mon May 19 21:54:01 UTC 2003

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.

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