Re: [LAD] zita-ajbridge and aloop

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To: <linux-audio-dev@...>
Date: Wednesday, July 17, 2013 - 3:21 pm

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On 2013-07-15 13:46, IOhannes m zmoelnig wrote:

so now that it is basically running, i'm having troubles to make it
run on the target hardware.

when running zita-a2j resp. -j2a in verbose mode, i understand that
the 1st number (the "loop error") should be as close to zero as possible.
in practice they are varying wildly betweeen +16 and -10.
how bad is this?

more troubling however, is that whenever i start an alsa application
(e.g. alsa_delay), one or both zita-*2* applications complain with:

Detected excessive timing errors, waiting 15 seconds.
This may happen with current Jack1 after freewheeling.

(btw, i'm using robin's jackd2-1.9.10+nobus+20130114gite4730c6c-NMU1)
after 15 or so seconds the waiting application recovers, only to
hick-up again after some seconds (see end of email).
even while the

i'm running the programs as follows:
jackd -dalsa -dhw:0,0 -r44100 -p1024 -n2
zita-j2a -v -d hw:Loopback,0,1 -c2 -r44100 -Q16 -p2048 -n2
zita-a2j -v -d hw:Loopback,0,0 -c2 -r44100 -Q16 -p2048 -n2
alsa_delay hw:Loopback,1,0 hw:Loopback,1,1 44100 2048 2

uname -a shows:
Linux WandBoard3 3.0.35-wand6.2 #1 SMP PREEMPT Wed Jul 17 10:21:20
CEST 2013 armv7l GNU/Linux

top doesn't show anything unusual:
20 0 4636 2344 2108 S 19.2 0.7 0:51.59 alsa_delay
20 0 86272 80m 79m S 9.1 24.9 0:12.38 zita-j2a
20 0 86272 80m 79m S 6.8 24.9 0:09.94 zita-a2j
20 0 92864 87m 80m S 2.9 27.0 0:05.00 jackd

finally: i'm wondering a bit on how to choose proper values for
period-size and fragement size.
that is: should zita-*a* period/nfrags match those of jack and/or
those of alsa_delay?

fgmasdr
IOhannes

typical output of zita-a2j;

-9.554 1.000058
-0.009 1.000039
-10.560 1.000043
9.244 1.000030
0.138 0.999943
3.434 0.999968
21.940 0.999898
16.323 0.999789
Detected excessive timing errors, waiting 15 seconds.
This may happen with current Jack1 after freewheeling.
Starting synchronisation.
-8.978 1.002152
-12.058 1.004386
-8.960 1.006809
14.445 1.000016
-5.345 1.003726
6.023 1.002011
4.334 0.999910
-7.868 1.003941
13.211 0.998161
-0.939 0.999894
-10.023 1.003701
11.972 0.998262
-4.587 1.000754
-0.417 1.001475
7.652 0.997528
-11.767 1.002691
19.205 1.002144
Detected excessive timing errors, waiting 15 seconds.
This may happen with current Jack1 after freewheeling.

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Messages in current thread:
[LAD] zita-ajbridge and aloop, IOhannes m zmoelnig, (Thu Jul 11, 1:59 pm)
Re: [LAD] zita-ajbridge and aloop, Dominique Michel, (Thu Jul 11, 6:49 pm)
Re: [LAD] zita-ajbridge and aloop, Joel Roth, (Fri Jul 12, 12:52 am)
Re: [LAD] zita-ajbridge and aloop, Dominique Michel, (Fri Jul 12, 9:17 pm)
Re: [LAD] zita-ajbridge and aloop, Fons Adriaensen, (Thu Jul 11, 3:58 pm)
Re: [LAD] zita-ajbridge and aloop, IOhannes m zmoelnig, (Mon Jul 15, 11:46 am)
Re: [LAD] zita-ajbridge and aloop, IOhannes m zmoelnig, (Wed Jul 17, 3:21 pm)
Re: [LAD] zita-ajbridge and aloop, Fons Adriaensen, (Wed Jul 17, 8:09 pm)
Re: [LAD] zita-ajbridge and aloop, IOhannes m zmoelnig, (Wed Jul 17, 3:29 pm)