[alsa-devel] snd_dummy on Centos - Redhat

[Takashi Iwai]

At Fri, 4 Sep 2009 11:14:22 +0200,
Giovanni Maruzzelli wrote:
> 
> On Fri, Sep 4, 2009 at 9:57 AM, Giovanni
> Maruzzelli<gmaruzz.lists at gmail.com> wrote:
> >
> > I'll do it and report
> 
> Follow is the run results with your patch.
> 
> It is possible that the "go to zero" you have seen before, is because
> the application pause sending audio between small snippets (words or
> phrases). This is not a problem with the other drivers, but it DO
> generates XRUNs (at least with other kind of ALSA channel drivers
> [yes, I have made another one, that works flawlessly, that uses cm108
> to interface GSM phones]).
> 
> I tried to activate the XRUN debug, as for your instructions, but does
> not give me output. Maybe it uses the DEBUG printk, that I saw does
> not generates output on this centos box (I probably would have to
> setup syslogd to print DEBUG messages). I had to modify your printks
> and delete the KERN_DEBUG from it to have messages to appear in
> /var/log/messages.

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.


Takashi