[LAD] zita-ajbridge and aloop

[IOhannes m zmoelnig]

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On 2013-07-15 13:46, IOhannes m zmoelnig wrote:
>> Did you use
> 
>> hw:Loopback,1
> 
> doh!
> 
> this is basically the answer i was looking for. thanks a lot!
> 
>>> what are the requirements for an application to use 
>>> zita-ajbridge?


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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