[LAU] jack2 help?

Matt Zagrabelny mzagrabe at d.umn.edu
Thu Aug 15 23:20:17 CEST 2019

Hey Chris,

On Thu, Aug 15, 2019 at 4:08 PM Chris Caudle <chris at chriscaudle.org> wrote:

> On Thu, August 15, 2019 3:36 pm, Matt Zagrabelny wrote:
> > Is there a "jack_FOO" CLI tool that can be used to query what available
> > ports there are?
> There is a group of tools known as jack example clients which may be
> useful.
> Actually jack_connect is part of that, look in /usr/bin and see what other
> jack* files exist, you probably already have them.

Yup. I looked around, but didn't run "--help" for each jack_ command.

> jack_lsp lists ports
> jack_wait waits for various jackd events and then exits; see the help file

Sounds promising.

> > The reason being is I need to put a sleep into my script to connect the
> > jack ports:
> >
> > /usr/bin/obs &
> > sleep 10
> > jack_connect system:out_1 OBS:jack_in
> Is jackd already running?

Yes. I'm running jack2 as a systemd user service - so it starts as soon as
I log in.

>   jack_wait would be for waiting on jackd to
> finish initializing in cases where obs quits out right after starting
> because it cannot detect a jack server running.

Hmmm... okay.

> > I'd like to eliminate the sleep command and poll jack to see if OBS has
> > any port available.
> I'm not sure how difficult it would be to parse the output from  jack_lsp,
> but I think it should be possible, and if there are no obs ports when you
> run the command, sleep 1 or 2 seconds and run again.


Thanks for the help!

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