[alsa-devel] snd_dummy on Centos - Redhat

[Takashi Iwai]

At Fri, 4 Sep 2009 11:33:32 +0200,
Giovanni Maruzzelli wrote:
> 
> On Fri, Sep 4, 2009 at 11:20 AM, Takashi Iwai<tiwai at suse.de> wrote:
> >
> > If it's XRUN, the stream has to be stopped once, so you must have
> > STOP log there.
> >
> >> So, this time for not having false positives I send you the result of
> >> a continuous play of music, without pauses in it (maybe a pause at the
> >> beginning):
> >
> > Hrm, is this the output from one stream?
> >
> >> Sep  4 11:04:04 localhost kernel: *** STOP
> >> Sep  4 11:04:25 localhost kernel: *** START: buffer=4096, period=2048,
> >> rate=16000
> >> Sep  4 11:04:25 localhost kernel: xxx delta=2, pos=32000(32), rest=2016000(2016)
> >> Sep  4 11:04:25 localhost kernel: xxx delta=3, pos=80000(80), rest=1968000(1968)
> >> Sep  4 11:04:25 localhost kernel: *** START: buffer=4096, period=2048,
> >> rate=16000
> >
> > Here you have the second start without stopping.
> >
> 
> For what I have seen hacking out my modifications to the dummy
> drivers, Skype open and close a lot the devices... Probably it do that
> for "ringing", making other announcements, etc.
> 
> They use the RTaudio library, probably with their own modifications....
> 
> Also, maybe the second START is the start of capture...?

Ah, of course.  I always forget you are debugging Skype :)
Maybe better to add a substream id (e.g. substream->stream,
substream->number) to avoid confusion.

If they are different substreams, my analysis doesn't make sense at
all.  If so, I don't see any particular problem in the log...


Takashi