JackAudio

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601 discussions

[Jack-Devel] Volume much softer on Jack than on ALSA/PulseAudio?

by Alyssa Vance

I'm running an ALSA -> PulseAudio -> Jack bridge setup on an Ubuntu 18.04 x86 laptop. Sound played via ALSA directly seems to be much louder than via Jack, eg.: gst-launch-1.0 audiotestsrc freq=200 volume=1.0 ! alsasink is much louder than gst-launch-1.0 audiotestsrc freq=200 volume=1.0 ! jackaudiosink I've looked at every volume knob I can find (via alsamixer, qasmixer, pactl list, etc.), and they're all at 100%. Does the PulseAudio -> Jack bridge have a volume parameter hidden in a config file, or something like that? Thanks.

5 years, 11 months

[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

6 years

[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.

6 years

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 > ****************************************** >

6 years

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.

6 years

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.

6 years

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

6 years

[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

6 years

[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)

6 years

[Jack-Devel] List of jackd startup and named instance questions

by Ethan Funk

Hello all. I have embarked on a long journey of porting my radio automation and mixing system from OSX (making extensive use of Apple's CoreAudio API) to a Linux/JACK/gstreamer system and potentially, making it a cross platform application. The application is actually a collection of programs, ranging from a studio UI, library management UI, database back-end, and an faceless audio-engine/mix system. I am currently working on the audio-engine port, since potentially I could port that and continue to use the old UIs on Macs until I can get those ported as well. In order to make this manageable, I decided to pull some audio features out of my existing audio-engine, notably AudioUnit effects hosting, IAX phone support, and multiple audio-device support. I should be able to add VL2 effects hosting and IAX back in at some point. But for the short term, I can use jack to host effects in another program for now, and just give up IAX/asterisk integration. The multiple audio-device support, via my own clock drift measurement and re-sampling scheme, is a loss for now, but it looks like alas-in and alas-out programs could be stop-gap approaches to that, and appears to use a similar underlying approach. So far, the porting is going much faster than I had expected. Jack2 is a very clean and well though out API. It is not unlike CoreAudio, only it's MUCH easier to use. Leveraging JACKs inter-application audio routing, I have further broken my audio-engine down into a mixing system and control session host, with separate programs executed for playing and recording/streaming audio content. This a very nice, clean way to break thing up, made possible by JACK. Thanks. That is the big picture. I have come across some questions that I need a little help with, all regarding the start-up process of the jackd server: 1) At first, JACK seems to be designed for a single jackd server running on a system, with the server control API lacking, as far as I can tell, a method to control multiple servers by name. But then, with the name command line option, I can actually run multiple servers tied to different audio devices. Does the server control API simple not support names at this point? Maybe this is just how JACK evolved, originally one jackd per machine, then named server support added, but not fully implemented across all the API? 2) Again, with the named server: I can start a named jackd server. I can connect to it using QjackCtl by setting the name property in the advanced tab of QjackCtl settings. But when I try to connect to the named server from my audio-engine application, via a jack_client_open() call, passing the name char string, my application instead tries to start up a jackd server instance, using the command noted in the jackd man page (first line of $HOME/.jackdrc). Is this a bug, or am I missing some detail? 3) Regarding the jack_client_open() behavior when no server is yet running: the function call does seem to execute the first line of $HOME/.jackdrc and start the jackd server running. However, it appears to inherit all the file descriptors from my application. This is a problem because my application is designed to self-restart on a crash. With jackd holding my application's TCP control socket open, my application can't restart (bind again to the desired TCP port) until after I kill the jackd process. I assume the auto-jackd startup code is forking and execing, and the code simply isn't closing the parent's file descriptors. Is this a bug or intentional? Is there a way I can detect if a jackd server is running ahead of time, so I can start the server myself using my own fork/exec which would closing my descriptors on the child, then, once I know jackd is running, call jack_client_open() in my app? 4) because my audio-engine is a faceless application, and can be run without a desktop session, I need it to be able to connect to a jackd server run by other users, or to start a jackd server that can be used by other users. I can verify that with Ubuntu 18.10, I can not start jackd from a user account, then connect to it from my application running as a different user, even if I run my app as root, not that I intend to do that as a real world workaround. Is there some approach, group permissions possibly, to allowing other users to access a jackd server? 5) Wishful thinking: Give jackd the ability to read QjackCtl config files, so I could configure things from the GUI, then stop jackd and be able to restart it from the server-control API or command line with a command line option pointing to a config file. Better yet, make a persistent JACK-aware place to store such file in the file hierarchy. Thanks, Ethan Funk

6 years, 1 month

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