20 May
2003
20 May
'03
12:35 a.m.
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:
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.
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.
t
Cheers.
Josh Green