[LAU] Can netjack1/2 over a direct ethernet connection substitute for local ALSA audio?

crocket crockabiscuit at gmail.com
Fri Mar 29 00:16:46 CET 2019

It seems I should just save headaches and use only ALSA for local audio
This means I am going to use a pair of good speakers for my desktop
computer and a pair of cheap speakers for Raspberry Pi.
Raspberry Pi will be responsible for turning on and off speakers via relays.

On Fri, Mar 29, 2019 at 12:46 AM Len Ovens <len at ovenwerks.net> wrote:

> On Thu, 28 Mar 2019, crocket wrote:
> > On Thu, Mar 28, 2019 at 4:06 PM Len <len at ovenwerks.net> wrote:
> >       Jack can not use two devices. speakers (via some kind of on board
> >       audio
> >       device I assume) and the usb mic will not be in sync and so clicks
> >       and
> >       pops would be assured. Some kind of sample rate conversion would be
> >       needed. zita-ajbridge or alsa-in would work for that.
> >
> >
> > Can I not just run two jack servers on Raspberry Pi?
> How would that help you? As soon as you want to use the mic and your
> speakers with the same application you will have under and over runs
> between one and the other. The only way around that is to use SRC which
> can be provided by either zita-ajbridge or alsa-in/out (the second comes
> with jack, but the first is better and may now be a part of jackd1). Do
> note that using netjack with the device on the Pi means that the internal
> audio on your desktop can't be used at the same time for the same reason.
> The backend for the jack server on your desktop is the jack server on the
> Pi so any audio device on your desktop would also have to be added via an
> SRC client such as zita-ajbridge or alsa_in/out. This means you desktop
> relies on your Pi for a solid sync... if you are usng your desktop audio
> for anything important that requires solid sync, I would use the local
> device as backend and use zita-njbridge to join the two jack servers on
> the two machines.
> > My Gentoo Linux desktop doesn't have pulseaudio. It only has ALSA at
> this moment.
> > I do not want pulseaudio.
> No problem (no skype either, but you may not need it) Lots of people use a
> jack to alsa bridge
> > I want the voices to not lag too much behind the lips.
> >
> > I just want Raspberry Pi and my desktop to share my speakers. Raspberry
> Pi will
> > serve as a morning alarm, and I need to watch videos on my desktop
> computer.
> > I use a USB microphone for foreign language practice and audio calls.
> That is what pulse (and the up and coming... maybe, Pipewire) is made for,
> but lots of people do not want to use it, Jack with alsa will get you
> there too. Latency shouldn't be a problem for that use, even with jack
> running 1024/2, though 128/2 should still be stable abd much better.
> > I can technically buy a USB hub that supports per-port power switching
> to have my
> > USB microphone turned off most of the time.
> > But, since Raspberry Pi 3 B+ supports per-port power switching, I wanted
> to know
> > whether I could use Raspberry Pi as a network USB hub or a network USB
> > microphone.
> Not sure I know what you mean by that... if any of my guesses are right,
> the answer is I don't know.
> --
> Len Ovens
> www.ovenwerks.net
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> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
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