JackAudio June 2019

jackaudio@lists.linuxaudio.org

13 participants
8 discussions

[Jack-Devel] Helper threads with lower priority?

by Johannes Lorenz

Hello, we run a DAW (LMMS) with jack and would like to exploit multiple cores. Currently, we have one jack process (using `jack_set_process_callback`) and multiple other processes that share all the work. The problem is that only the jack process has RT prio. Imagine the following example: * 4 threads, of which one is the jack thread, 3 have lower priority * 4 tasks (e.g. 4 instruments play one note each) * the realtime process is finished quickly, the other threads get preempted by the kernel These are situations where using such non-realtime helper threads can threaten realtime behaviour. What is the best practice? * Is it possible/good to use multiple rtprio threads controlled by jack? (multiple clients, or multiple threads in one client) * Should we keep using our non-rt helper threads? * Should we be single-threaded, to have a (probably) longer average time, but a better worst-case time? * Should we start with helper threads and only the last few jobs will only be run by the realtime thread (to avoid problems like in the example)? Many thanks on advance! Johannes

4 years, 9 months

[Jack-Devel] AVB Backend

by Christoph Kuhr

Hi *, 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 pro a) - the AVDECC connection management could be done seamlessly in a jack way - out of the box avb functionality con a) - only one talker/listener, single audio interface - huge programming effort - no dynamic audio mapping pro b) - multiple talkers/listeners with multiple audio interface using alsa api - avoiding huge code addition to the backend, thus much easier to maintain - AVDECC handling per client for dynamic audio mapping con b) - cpu load... price for multiple talkers/listeners I'm excited to hear your opinions! Best, Ck -- Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.

4 years, 10 months

Re: [Jack-Devel] Jack-Devel Digest, Vol 155, Issue 8

by Vintsent

R Op di 25 jun. 2019 22:44 schreef <jack-devel-request(a)lists.jackaudio.org>: > Send Jack-Devel mailing list submissions to > jack-devel(a)lists.jackaudio.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org > or, via email, send a message with subject or body 'help' to > jack-devel-request(a)lists.jackaudio.org > > You can reach the person managing the list at > jack-devel-owner(a)lists.jackaudio.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Jack-Devel digest..." > > > Today's Topics: > > 1. Re: Korg nanoKONTROL2 and Native Instruments Komplete Audio 6 > MIDI issues (Brian Hechinger) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 25 Jun 2019 16:21:58 -0400 > From: Brian Hechinger <wonko(a)4amlunch.net> > To: jack-devel(a)lists.jackaudio.org > Subject: Re: [Jack-Devel] Korg nanoKONTROL2 and Native Instruments > Komplete Audio 6 MIDI issues > Message-ID: <e8b019d8-4bcb-9981-9c62-01f1111633a3(a)4amlunch.net> > Content-Type: text/plain; charset=utf-8; format=flowed > > Huh, telling the ASLA-MIDI bridge to Export HW Ports fixed everything. > > *shrug* > > -brian > > On 6/22/19 5:26 PM, Ralf Mardorf wrote: > > On Sat, 22 Jun 2019 15:39:24 -0400, Brian Hechinger wrote: > >> So if amidi can list them why don't they show up in Claudia? I'm > >> confused. > > I've got an Arch Linux and an Ubuntu install, but even for the Ubuntu > > install I'm neither using UbuntuStudioControls nor Cadence. > > > > https://help.ubuntu.com/community/UbuntuStudio/UbuntuStudioControls > > https://kx.studio/Applications:Cadence > > > > I would disable all autostarts and manually start one after the other by > > command line, jackd 2 instead of jackdbus and then a2jmidid. > > > > Keep in mind that issues are expected: > > > https://lists.ubuntu.com/archives/ubuntu-studio-users/2019-June/011434.html > > > > It was mentioned several times on the Ubuntu Studio mailing lists, that > > there are problems with Ubuntu Studio in combination with kxstudio > > repositories. > > _______________________________________________ > > Jack-Devel mailing list > > Jack-Devel(a)lists.jackaudio.org > > http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Jack-Devel mailing list > Jack-Devel(a)lists.jackaudio.org > http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org > > > ------------------------------ > > End of Jack-Devel Digest, Vol 155, Issue 8 > ****************************************** >

4 years, 10 months

Re: [Jack-Devel] Korg nanoKONTROL2 and Native Instruments Komplete Audio 6 MIDI issues

by Ralf Mardorf

On Sat, 22 Jun 2019 15:39:24 -0400, Brian Hechinger wrote: >So if amidi can list them why don't they show up in Claudia? I'm >confused. I've got an Arch Linux and an Ubuntu install, but even for the Ubuntu install I'm neither using UbuntuStudioControls nor Cadence. https://help.ubuntu.com/community/UbuntuStudio/UbuntuStudioControls https://kx.studio/Applications:Cadence I would disable all autostarts and manually start one after the other by command line, jackd 2 instead of jackdbus and then a2jmidid. Keep in mind that issues are expected: https://lists.ubuntu.com/archives/ubuntu-studio-users/2019-June/011434.html It was mentioned several times on the Ubuntu Studio mailing lists, that there are problems with Ubuntu Studio in combination with kxstudio repositories.

4 years, 10 months

Re: [Jack-Devel] Korg nanoKONTROL2 and Native Instruments Komplete Audio 6 MIDI issues

by Ralf Mardorf

On Sat, 22 Jun 2019 13:39:00 -0400, Brian Hechinger wrote: >wonko@deepthought:~$ amidi -l >Dir Device Name >IO hw:0,0,0 nanoKONTROL2 MIDI 1 >IO hw:1,0,0 Komplete Audio 6 MK2 MIDI 1 >wonko@deepthought:~$ > >I'll try to reboot but I'll also try the USB power thing you mentione In my experiences, if USB bus power is the culprit, amidi doesn't list the devices.

4 years, 10 months

Re: [Jack-Devel] Korg nanoKONTROL2 and Native Instruments Komplete Audio 6 MIDI issues

by Ralf Mardorf

On Sat, 2019-06-22 at 13:39 -0400, Brian Hechinger wrote: > Yes, Ubuntu Studio 18.04.02 with the kxstudio repos and Cadence setup. https://lists.ubuntu.com/archives/ubuntu-studio-users/2019-June/011434.html ;) Regards,Ralf

4 years, 10 months

[Jack-Devel] Korg nanoKONTROL2 and Native Instruments Komplete Audio 6 MIDI issues

by Brian Hechinger

So my previous setup was a Creative Labs SB1095 and the nanoKONTROL2. The nanoKONTROL was showing up via the ALSA-MIDI bridge and I was using it to control Ardour. I replaced the SB1095 with a Native Instruments Komplete Audio 6 and now the nanoKONTROL no longer shows up as a MIDI device. The ALSA-MIDI bridge is running because I get the passthrough device in Claudia. The Audio6 doesn't show up as a MIDI device either. The weird thing is when I first got the Audio6 I unplugged the SB and plugged in the Audio6 and it did show up as a MIDI device. JACK *really* dislikes having its audio device removed out from under it I noticed so audio never worked again after that. :) I kept the Audio6 plugged in and rebooted. I got audio working but MIDI never came up on either the nanoKONTROL or the Audio6. I'm completely stuck now and don't know what to do, please help!! Thanks! -brian

4 years, 10 months

[Jack-Devel] Mention abio library and Tools (example aubiotrack) in the jack utilities section on jackaudio.org/applications/

by Tobias Boesch

Hello everyone, I want to suggest to add the aubio tools (https://aubio.org/) to the utilities section on the jack applications page (http://www.jackaudio.org/applications/). The tools can be used for audio labbeling. I personally use aubiotrack from the aubio-tools package (standard package in ubuntu) to sync music to lights in realtime together with QLC+ using aubiotracks midi output. Aubio comes with jack support. Best regards Tobias (topas-rec)

4 years, 10 months

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JackAudio June 2019