[Jack-Devel] AVB Backend

Ethan Funk ethan at redmountainradio.com
Wed Jun 19 22:12:58 CEST 2019

I vote for B as well.  I am working on porting a Mac OS X radio
automation system I wrote to Linux/FreeBSD using Jack2.  AVB is
certainly on my radar for use!  However, I was under the impression,
without having dug to deep into the protocol, that the AVB's
precision network time management allows all devices to share a sample
clock.  That sure would make it easy from a JACK perspective. No
asynchronous re-sampling would be required (if I am correct about
network time). Since I have no AVB equipment, I am not clear how one
goes about setting up which device on the network is the clock master,
but it must be configurable somehow.


On Wed, 2019-06-19 at 15:03 -0500, Chris Caudle wrote:
> On Thu, April 11, 2019 3:44 pm, Christoph Kuhr wrote:
> > I wanted to start a discussion of what kind of AVB connectivity makes the
> > most sense for jack.
> > But please keep in mind what AVB is and isn't.
> > 
> > a) Fully functional Backend
> > b) Media Clock Backend with AVB jack clients
> ...
> > con a), 
> > - only one talker/listener, single audio interface
> ...
> > pro b)
> > - multiple talkers/listeners with multiple audio interface using alsa api
> I did not see many replies to this, but if I understand the limitations
> correctly I believe b would be the more useful.
> Is the limit described for a implying that if you had for example two or
> three of the MOTU AVB interfaces, you could only connect to one at a time?
> If so then definitely b would be the preference, since one of the
> advantages of network audio protocols is that you can have a distributed
> recording and playback system, and if your input needs grow you do not
> have to trade out a small interface for a larger interface, you can just
> add an additional small interface, with the added benefit that the
> interfaces can be in two different rooms.
> If you are limited to one interface at a time then the only benefit over
> USB is a longer cable.
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