Re: [LAU] How to get started writing a JACK app? (also what distro for BeagleBone) - Linux-audio-user

10 Jan 2018

In-process JACK clients are a very special case and almost nobody
implements or uses them. They are like plugins for the JACK server, and
that's not really the point of JACK (which was designed to connect distinct
processes).

Look at the out-of-process ("normal") example(s) instead.

On Tue, Jan 9, 2018 at 9:39 PM, Andrew Voelkel &lt;jandyman.voelkel(a)gmail.com&gt;
wrote:

...
  Hi and thanks.

 So looking at the in-process example, I’m guessing it compiles to a
 dynamic library which the server loads? If so, how does the server know the
 capabilities of the in-process client.

 I’m coming from writing VST plug-ins on Windows or Audio Units on Apple
 platforms, in case I sound confused.

 I’m also having trouble getting used to the idea of the client being the
 plug in, normally I would think the client would be what is called the
 “host” on Windows or Apple, and the plug-in would closer to a “server”. But
 here the terminology is reversed. Am I understanding correctly? The
 “client” in JACK is the plug-in (for in-process use), correct?

 Finally, I’d like to get started seeing whether the eco-system works for
 low latency with existing apps and components for diving in. Is AVLinux the
 way to go, and is there any reason it will not work on BeagleBone?

 I’m not a Linux expert in case you can’t already tell! It’s not that I
 have zero experience, but sometimes it’s close, depending on context.

 But I do know audio, and operating system design, and threading, and SIMD,
 and etc.

    - Andy

 *From: *Linux-audio-user &lt;linux-audio-user-bounces(a)lists.linuxaudio.org&gt;
 on behalf of Paul Davis &lt;paul(a)linuxaudiosystems.com&gt;
 *Date: *Tuesday, January 9, 2018 at 4:41 PM
 *To: *Benoît Rouits &lt;brouits(a)free.fr&gt;
 *Cc: *linux-audio-user &lt;linux-audio-user(a)lists.linuxaudio.org&gt;
 *Subject: *Re: [LAU] How to get started writing a JACK app?

 please. not sourceforge.

 JACK code lives on github ...  https://github.com/jackaudio/
 example-clients

 On Tue, Jan 9, 2018 at 6:21 PM, Benoît Rouits &lt;brouits(a)free.fr&gt; wrote:

 Hello  Andy

 as a starting point, you could look at:

 http://jackit.sourceforge.net/cgi-bin/lxr/http/source/example-clients/

 This is C client code samples for jack.

 HTH,
  Benoît

 Le 09/01/2018 à 16:19, Andrew Voelkel a écrit :

     Hi,____

     __ __

     I’m new to this list. I’m thinking of giving low latency real time
     audio in Linux another try after my last unsuccessful attempt a few
     years ago. My goal is to put some of my own DSP code into a hardware
     appliance and use it to process audio signals during music
     rehearsals and performances.____

     __ __

     I think this boils down to getting an appropriate distro, getting
     JACK working in a low latency configuration with a multichannel USB
     interface. And then …____

     __ __

     Writing a JACK app to process the audio. ____

     __ __

     I’ve done some googling and found a lot about _/using/_ JACK, but
     not much about writing a JACK app. ____

     __ __

     Are there any examples or tutorials out there?____

     __ __

     I’m already up to speed on doing C++ cross development with  Eclipse.____

     __ __

     I’ve got a BeagleBone black sitting around here I could use to
     experiment.____

     __ __

       * Andy____ 

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