Linux-audio-user

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20706 discussions

[LAU] systemd woes with jackd and its permissions (raspbian)

by Peter P.

Hi list, please help with a realtime permissions issue trying to start jackd via my systemd service script on raspbian. As root or as user peter (which is part of the audio group) I can start jackd fine using either jackd -v -R -d alsa -r 44100 -P or jackd -v -d alsa -r 44100 -P No error message mention that realtime was (or wasn't) enabled. Is this normal and intended? Checking with htop, there are three jackd processes with a priority of 20 and on with -11. Does this mean that realtime is enabled? Using mplayer as user peter I can play back audio via jack. Now I try to start jackd automatically from a systemd service file created as /etc/systemd/system/jackd.service with the following contents: [Unit] Description=jackd After=sound.target [Service] User=peter ExecStart=/usr/bin/jackd -d alsa -r 44100 -P [Install] WantedBy=multi-user.target I install that service with sudo systemctl enable jackd.service and run sudo systemctl daemon-reload after having changed the above service file. When I start that service it fails with errors in the journal: "JACK is running in realtime mode, but you are not allowed to use realtime scheduling." and "Please check your /etc/security/limits.conf for the following line" and so on. Messages that are not present when starting jackd as user from the command line. Now I am puzzled because I thought that it is enough to specify user "peter" in the systemd service. Well if I comment the line User=peter out and start the service again, jackd runs. It is five processes with priority 20 and one with -11. The stupid thing now is that the normal user peter can use that jackd: Mplayer tells me that "connect(2) call to /tmp/jack-1000/default/jack_0 failed (err=No such file or directory)" So I reckon that a user can't use a jackd started by another user, or root? Now I removed above service and installed it as user service ~/.local/share/systemd/user/jackd.service and contents: [Unit] Description=jackd After=sound.target [Service] User=peter ExecStart=/usr/bin/jackd -d alsa -r 44100 -P [Install] WantedBy=default.target It gets installed with systemctl --user enable jackd.service and started with systemctl --user start jackd.service Jackd is now started and can be used with mplayer. But the systemd service is no longer started at boot not at login of user peter. I have to run: systemctl --user start jackd.service Also trying loginctl enable-linger peter does not help. The general question remains: How can I run a systemd user service without that user being logged in? Another way recommended at https://www.linux.org.ru/forum/admin/10795275 or https://ask.fedoraproject.org/en/question/131584/jack-fluidsynth-as-user-sy… is to add some lines specifying Limits. [Unit] Description=jackd After=sound.target [Service] User=peter LimitRTPRIO=infinity LimitMEMLOCK=infinity ExecStart=/usr/bin/jackd -d alsa -r 44100 -P [Install] WantedBy=multi-user.target It does not start jackd with the same error as above. "JACK is running in realtime mode, but you are not allowed to use realtime scheduling." and "Please check your /etc/security/limits.conf for the following line" Now this took me four hours so far without success and I wonder what is a functional way to use jackd via systemd on a headless computer in 2019. All comments are very welcome! Peter

6 years

[LAU] Creating a personalised HRTF?

by Jeanette C.

Hey hey, is there any (convenient) way to create a personal HRTF (head related transfer function)? I've been wondering about this for a while. I knew only one way: go to a very tech savvy place - a uni maybe - and let them do it. Now, I've just listened to a NAMM video ( http://www.youtube.com/watch?v=FWotz3oz2gs ) and wondered if there is any open source solution, be it along their lines or any other, to create a personal HRTF. I am particularly interested in using such a model in Csound, which offers very nifty modules to work in three dimensions with HRTF. Any tips are welcome. Best wishes and thanks, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * SoundCloud: https://soundcloud.com/jeanette_c * Twitter: https://twitter.com/jeanette_c_s * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c But tell me what happens when it stops? <3 (Britney Spears)

6 years

[LAU] Find all "beat offsets" from .mscx (MuseScore 3 uncompressed) or exported MusicXML?

by Kevin Cole

Hi, I'm not terribly well-versed in either music theory or the capabilities of all the various musical software tools out there in the happy land of Linux (in my case, Arch Linux). I'm looking to "shortcut" a process: I want to generate two sets of WebVTT captions / subtitles for an MP3 that was produced from a MuseScore 3 file. One set will be chord notations like "F#m/A". (The other will be lyrics. Sort of a karaoke thing with chords.) Since the chord changes fall on a beat, and there are no alterations in the time of this piece -- i.e. no "slower" or "faster" parts, but there are time signature changes, it should be a programmatically solvable problem. The simplest approach seemed to be to generate a starting and ending time for each beat, and go through a parseable file and parse out which chord falls where and attach it to the appropriate element in the list of durations. The thought occurred that, if I have the duration of the file, and either the uncompressed MuseScore or uncompressed MusicXML, there might be a clever tool or Python module to parse the file and come up with the total number of beats, and then divide the duration by that. Rather than invent the wheel from scratch, I thought I'd ask if there was already a wheel -- or if the wheel I'm building ultimately won't roll. ;-) Is this making any sense, and are there such handy tools? Thanx.

6 years

[LAU] Yoshimi V 1.7.0

by Will Godfrey

Out Now :) V1.7.0 Just one visible change, but a major one. Instead of a few controls giving an immediate response, there are only a few that don't :) More details are in /doc/Yoshimi_1.7.0_features.txt Yoshimi source code is available from either: https://sourceforge.net/projects/yoshimi Or: https://github.com/Yoshimi/yoshimi Full build instructions are in 'INSTALL'. Our list archive is at: https://www.freelists.org/archive/yoshimi To post, email to: yoshimi(a)freelists.org -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

6 years, 1 month

[LAU] Guitarix2 release version 0.39.0

by Hermann Meyer

I'm pleased to announce the release of guitarix2-0.39.0 A virtual guitar amplifier for Linux running with jack (Jack Audio Connection Kit). This is a maintenance release which mainly is meant to get rid of the python2 build dependency. Changes are so far: - updated waf version to 2.0.19 by Andreas Degert - cleanup all GTK(mm) calls to be able to build with -DGSEAL_ENABLE flag (prepare to update to GTK3) by Hubert Figuière - update Russian Translation by Valeriy Shtobbe and Olesya Gerasimenko (Basealt Translation Team) - bind lv2:enabled to guitarix on_off switch and remove from UI by Hermann Meyer - update all build scripts to use faust version 2.15.11 by Hermann Meyer - add new option -E --hideonquit, to make the UI experience smooth when used as LV2 plugin (via Carla export) by Hermann Meyer - add exit handler and warning when sample-rate is above 96kHz by Hermann Meyer You could get it here: https://sourceforge.net/projects/guitarix/ regards hermann

6 years, 1 month

Re: [LAU] Berlin Linux Audio meeting @ c-base 2020-01-14

by David Runge

On 2020-01-13 10:35:11 (+0100), Daniel Swärd wrote: > Hi. > > Tomorrow is again the second Tuesday of the month, so it's time for the > regular meeting at c-base. Hope to see you there. I don't think I have time this week. If I can make it, maybe later (after 21:00). Best, David -- https://sleepmap.de

6 years, 1 month

[LAU] Using udev to launch JACK as specific user?

by Mario Lang

Hi. After 2 hours of "edit, reboot, fail" I am giving up and ask here. I feel like what I want should be relatively simple, but it isn't. I'd like to launch JACK via Systemd whenever a certain card is present. I have a udev rule in /etc/udev/rules.d/10-8A.rules that looks like this: ACTION=="add", SUBSYSTEMS=="sound", ATTRS{id}=="D8A", TAG+="systemd", SYMLINK+="MOTU-8A" This works, I get a /dev/MOTU-8A symlink. The idea was to declare [Install] WantedBy=dev-MOTU-8A.device in my systemd user service for JACK. However, contrary to what the web seems to document, the symlinked device does not show up in systemctl. So apparently, I can't depend on it either. I am guessing anyone here must have a similar setup. In its purest form, I am looking for a way to launch a systemd user service once a certain ALSA hw device is available. I see references to ENV{SYSTEMD_USER_WANTS}="jack.service", however, I totally fail how this should work. Udev has no idea which user should launch this service. Any hints to untangle this sort of messy situation? -- CYa, ⡍⠁⠗⠊⠕

6 years, 1 month

[LAU] Embedded and FPGA programming for Audio signal processing job offer

by Stéphane Letz

See: https://jobs.inria.fr/public/classic/en/offres/2019-02255 Stéphane

6 years, 1 month

[LAU] A new year, a fresh start

by Jeremy Jongepier

Dear all, First of all a happy 2020 (even though it's way past Epiphany)! So what's the fresh start about? Well, registration of the linuxaudio.org domain has been handed over to yours truly so if you need any DNS changes regarding any linuxaudio.org subdomains then I can take care of that now directly. Thanks Daniel James of 64 Studio for taking care of the domain for so long! Other part of the fresh start is that I migrated the web server to a new cloud region which is faster and more performant. I just changed all the DNS records so if you spot anything weird that just worked before then please let me know! The mail server will follow this weekend so if mail seems a bit flaky the coming weekend then you know what might cause it. Best regards, Jeremy

6 years, 1 month

[LAU] LAC Paper Upload not accessible

by Christoph Kuhr

Hi *, I wanted to upload a paper for the LAC 2020. But the lac.sciencesconf.org seems broken. I immediately get logged out after logging in. Is this gonna be fixed? I tried to contact lac(a)linuxaudio.org but did not get any reaction so far. Does someone else have the same problem? Why didn't you use OpenConf, like the last times? Worked very well. BR, Ck

6 years, 1 month

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