[LAU] using Jack an interface to ecasound

[john gibby]

Hi Chris et al,
Thanks so much... I thought I might be using jack incorrectly...  So now
I'm trying to use jack as explained by Chris above.  Here's some output:

gibbyj at LinuxBVR:~/Downloads$ jackd -R -d alsa -d hw:2 -p 128 -n 2
jackd 0.124.2
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

JACK compiled with System V SHM support.
`default' server already active
no message buffer overruns

I am not sure what it means when it says 'default' server already active.
I thought I had stopped the server with qjackctl.  When I start it as
above, and then start qjackctl, qjackctl still thinks the server is
stopped.  (Kinda wish I had jack2, seems like it has better admin
functions.)

Here's some more output; there's a jackdbus process; why is that here, I
thought that was jack2?

 4611 gibbyj    20   0  813480  76580  56480 S   0.3  1.0   2:08.47
qjackctl
 4413 gibbyj    20   0  223540  17504  16136 S   0.3  0.2   1:31.74
jackdbus
 4611 gibbyj    20   0  813480  76580  56480 S   0.3  1.0   2:08.48
qjackctl

gibbyj at LinuxBVR:~/Downloads$ killall jackd
jackd: no process found
gibbyj at LinuxBVR:~/Downloads$ ps -ef |grep jackd
gibbyj    4413     1  0 Jan17 ?        00:01:31 /usr/bin/jackdbus auto
gibbyj   12590  3958  0 02:12 pts/1    00:00:00 grep jackd
gibbyj at LinuxBVR:~/Downloads$

No sound coming out yet with this new approach, I guess b/c I see 32
choices for hw:2 playback and I need to figure out which ones are the right
ones to send the output to.  But I think I'm making progress...
Thanks,
John



On Tue, Jan 17, 2017 at 4:31 PM, Chris Caudle <chris at chriscaudle.org> wrote:

> On Tue, January 17, 2017 2:58 am, john gibby wrote:
> >> I'm having trouble setting up Jack to interface between my digital piano
> >> application (pianoteq) and the ecasound audio processing app.  I'm using
> >> ecasound with Ladspa plugins to create a crossover network.  Ecasound
> >> splits the 2 pianoteq channels into six (woofer, mid & tweeter), and
> >> sends them to my analog outputs through alsa.
>
> That is a very odd way to use jackd.  The usual way is that jackd controls
> the audio interface.
> How do you even configure ecasound to present a jack interface and also
> connect to the ALSA hardware directly?  Most software supports using
> either ALSA directly or jack, but not both simultaneously.
>
> If you want to continue to use ecasound the more typical way would be
> configure jackd to control the output hardware, configure ecasound to use
> jack, and then use whatever connection configuration tool you want (e.g.
> qjackctl or jack_connect) to connect the output of your audio applications
> to the inputs of ecasound, and the outputs of ecasound to the sound card.
>
> As others pointed out something like zita_lrx might fit into a jack setup
> more easily, but if you already have ecasound configured and ecasound can
> use jack then the setup I describe above might be the easiest way to
> modify what you currently have.
>
> --
> Chris Caudle
>
>
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> Linux-audio-user at lists.linuxaudio.org
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>
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