Re: [LAD] JACK and ALSA elucidations

(My name is Alex, I just want to chime in real quick. Been following the
convo, have a full-year's worth of Ubuntu LAD bug reports to deliver, not
even sure how to go about it, but it's all 100% - or almost - stuff I
haven't been able to find anywhere, and the reason I wanted to chime in
until now is that this is the exact crux of the matter. I will keep in
touch, no worries about that. Can't wait to deliver the Full Report on the
Problem with LAD. 17 years computer-assisted sound design here, and I'm not
alone in what has become the bane of my existence, which is why I just
switched back to Windows, believe it or not. Don't mind me, just letting
you know I'm here, listening, at the controls, headphones on.) -A.G.

On Mon, Mar 10, 2014 at 9:51 AM, Gianfranco Ceccolini <
gianfranco@email-addr-hidden> wrote:

> Hi Guys
>
> sorry for the delay. carnival time here in Brasil...
>
> Jeremy: I'm using the BB Audio Cape, v1. I'll take a look at the audio
> driver, but from our tests the BBB cpu won't do the job. We're heading to
> the Cubie's A20 cpu.
>
> Paul. I'm really sorry for my lack of comprehension, but I still don't get
> it. Is there a relation between the ALSA period with JACK's period?
>
> Kind regards
>
> Gianfranco
> The MOD Team
>
>
>
> Em 28/02/2014, à(s) 17:01, Jeremy Jongepier <jeremy@email-addr-hidden>
> escreveu:
>
> > On 02/28/2014 06:57 PM, Gianfranco Ceccolini wrote:
> >> When starting it on the Beaglebone Black I get:
> >>
> >>
> >> /usr/bin/jackd --realtime -P80 -dalsa -r48000 -p128 -n2 -Xraw
> >>
> >>
> >> creating alsa driver ... hw:0|hw:0|128|2|48000|0|0|nomon|swmeter|-|32bit
> >>
> >> configuring for 48000Hz, period = 128 frames (2.7 ms), buffer = 2
> periods
> >>
> >> ALSA: final selected sample format for capture: 32bit integer
> little-endian
> >>
> >> ALSA: use 16 periods for capture
> >>
> >> ALSA: final selected sample format for playback: 32bit integer
> little-endian
> >>
> >> ALSA: use 16 periods for playback
> >>
> >>
> >> - what are those "periods" in the ALSA lines? (2 for the PC and 16 for
> the
> >> BBB) ? I read a post by Jeremy Jongepier about the Cubieboard2 stating
> that
> >> the hardcoded values for the Cubie (Minimum number of periods was 4 and
> >> minimum buffer size was 1024) where unfit for realtime operation. Why is
> >> that so?
> >
> > Hello Gianfranco,
> >
> > What kind of audio interface are you using with the BBB? I'm no ALSA
> > expert but it seems as if the minimum period size of the driver has been
> > set to 16. If you have access to the source code of the driver you could
> > experiment with lower default values for .period_bytes_min and
> .periods_min.
> >
> > Bye,
> >
> > Jeremy
> >
> > _______________________________________________
> > Linux-audio-dev mailing list
> > Linux-audio-dev@email-addr-hidden
> > http://lists.linuxaudio.org/listinfo/linux-audio-dev
>
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Received on Mon Mar 10 20:15:02 2014