JackAudio

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601 discussions

by Hai Nguyen

Hi, Simple question about JACK that I haven't been able to find anywhere else. Hoping someone here's kind enough to set me straight. :) Coming from PulseAudio, I noticed that JACK's documentation and discussions seem to barely mention things regarding channels....but do refer to ports quiet often. So I was wondering what kind of mapping there is between say L and R channels and JACK ports? Or does a mapping even exists? Thanks, Hai

9 years, 5 months

[Jack-Devel] [jackaudio/headers] 5a910a: add missing `void` from jack_get_time prototype

by Stéphane Letz

Branch: refs/heads/master Home: https://github.com/jackaudio/headers Commit: 5a910a030b1bb6e49db0994a2ee82eade1191bd3 https://github.com/jackaudio/headers/commit/5a910a030b1bb6e49db0994a2ee82ea… Author: Andrew Kelley <superjoe30(a)gmail.com> Date: 2015-11-09 (Mon, 09 Nov 2015) Changed paths: M jack.h Log Message: ----------- add missing `void` from jack_get_time prototype Commit: 07f1ecf1ce119d861ec631cb4a6a81a1ab1e5657 https://github.com/jackaudio/headers/commit/07f1ecf1ce119d861ec631cb4a6a81a… Author: Stéphane Letz <letz(a)grame.fr> Date: 2015-11-11 (Wed, 11 Nov 2015) Changed paths: M jack.h Log Message: ----------- Merge pull request #6 from andrewrk/master add missing `void` from jack_get_time prototype Compare: https://github.com/jackaudio/headers/compare/23c29914806e...07f1ecf1ce11

9 years, 5 months

[Jack-Devel] Mac OS X build - XCode/waf?

by Patric Schmitz

Hi, is the build for Mac OS X currently maintained? Where are the most up-to-date build instructions to be found? I see there's a waf wscript set up in the macosx folder, but there's also the XCode project. Which one is the 'official' way to build, which one would you prefer to have fixed if I dig into this (neither works out of the box)? Thanks! Patric

9 years, 5 months

[Jack-Devel] Is it possible/reasonable to change jack to an int data type?

by Caleb Crome

Hi, I'm building a test application for doing bit-perfect loopback testing on my sound card drivers. However, since jack uses floating point types, it seems that I can't get a bit-perfect data in and out from (16-bit) 0x0000 to 0xFFFF. the LSB seems to get rounded on and off, and also it seems that jack enforces a range of -32767 to +32767 instead of -32768 to +32767 (for 16-bit audio). Is it possible that it's as simple as changing jack_default_audio_sample_t? :-) Thanks, -Caleb

9 years, 6 months

[Jack-Devel] Client timeout from jackd1 when calling get_all_connections from set_port_registration_callback

by Mike Kazantsev

Hello, I have a question: Is it expected that calling "get_all_connections(port)" from a port registration callback in libjack can cause client being timed-out by jackd1? See more detailed test-case description and error output below. I was creating an app where JACK (used only jackd1) manager code would connect/disconnect JACK ports as they appear or disappear, with the assumption that it'd be the only app managing jack connections on-the-fly. Fairly obvious (expected) way to do it seem to be: * Init client. * Run "set_port_registration_callback(my_callback)". * Enumerate all current ports, create all connections between these. * On every port registration callback: * Run "get_all_connections(port)". * connect() to ports which should-be - but not yet - connected. * disconnect() from ports that should not be connected, but got returned from that call. But when I tried doing that, it seems that running "get_all_connections(port)" causes (unexpected) error when port with same name appears for the second time during app lifecycle. I.e. starting jackd1 as "jackd -d dummy", then starting the client, then running "alsa_out -d hw:CARD=SB", stopping alsa_out and running it again, causes the client to time-out. Error message in client (from libjack, I think): cannot read result for request type 10 from server (Connection reset by peer) cannot send event response to engine (Broken pipe) cannot continue execution of the processing graph (Bad file descriptor) jack_client_thread: graph error - exiting from JACK jackd output when this happens: timeout waiting for client test-client to handle a port registered event cannot send port registration notification to test-client (Resource temporarily unavailable) One complication here is that I'm using not a C client, but a python CFFI wrapper around it (see links below), which seem to translate API pretty much verbatim from what I see in doxygen docs. But I can't be sure it's not an issue with the wrapper, of course. I've attached the python code that 100% reliably reproduces this behavior on this machine, and on clean a Debian Jessie VM. Running "get_all_connections(port)" anywhere outside of that callback seem to resolve (or work around) the issue. I wasn't able to find any reference to the issue (i.e. something like "you should not do that!") in the docs or the google, and python module author can't confirm (see links below) whether it's an API bug/feature or a problem with python module itself. So the question is basically whether it's expected behavior of jack API (and maybe is or should-be documented somewhere), or totally unexpected, and likely an issue with python module? Python API wrapper module: https://github.com/spatialaudio/jackclient-python/ Related issue I've opened with the python API wrapper module: https://github.com/spatialaudio/jackclient-python/issues/30 Python (python2) code to reproduce the issue (also attached to this mail): http://hastebin.com/dehubayeyo.py Code link above also contains instructions on how to run it to reproduce the issue. This code depends on python jack client module linked above, which can be built/installed with e.g. "pip2 install --user jack-client" (to ~/.local/, "pip" script is usually packaged in distros as "python2-pip" [arch] or "python-pip" [debian]). Would appreciate any suggestions. Thanks! -- Mike Kazantsev // fraggod.net

9 years, 6 months

[Jack-Devel] [jackaudio/jack1] f9bcea: change max size of a JACK MIDI event to 64 bytes

by Paul Davis

Branch: refs/heads/master Home: https://github.com/jackaudio/jack1 Commit: f9bcea80e152239f7c086ea40193682fbb574db0 https://github.com/jackaudio/jack1/commit/f9bcea80e152239f7c086ea40193682fb… Author: Paul Davis <paul(a)linuxaudiosystems.com> Date: 2015-10-08 (Thu, 08 Oct 2015) Changed paths: M drivers/alsa_midi/a2j.h Log Message: ----------- change max size of a JACK MIDI event to 64 bytes Commit: 7d8204825bcfe4a8505fef8b9ce54f1e28c2d6c5 https://github.com/jackaudio/jack1/commit/7d8204825bcfe4a8505fef8b9ce54f1e2… Author: Paul Davis <paul(a)linuxaudiosystems.com> Date: 2015-10-08 (Thu, 08 Oct 2015) Changed paths: M drivers/alsa_midi/alsa_midi.c Log Message: ----------- add more debugging to alsa midi out Compare: https://github.com/jackaudio/jack1/compare/5af5815c4763...7d8204825bcf

9 years, 6 months

[Jack-Devel] Website doesn't redirect

by Xavier Mendez

Hi, I just wanted to report that the website is available under both http://www.jackaudio.org and http://jackaudio.org. This is not good practice, it can be identified as duplicate content, it should be considered having the www. version redirect to the naked one, or vice versa. Xavi

9 years, 6 months

[Jack-Devel] Three academic job openings at soundjack.eu

by Adrian Knoth

[repost from LAD, forgot jack-devel in the list of recipients] Hi! Alexander Carot contacted me to spread the news: Starting in April 2016, three research assistant positions (PhD candidates welcome) will be available within the Soundjack project. If interested, please contact Prof. Carôt (a.carot(a)inf.hs-anhalt.de). (copy-pasted from <http://www.soundjack.eu/jobs.html>) I've been told one is TV-L13, the other is 75% and the third is 50% (money equivalent can be found here [0]) The project will be about making music in a distributed environment, contract will last three years (no idea if extendible). Working from home is negotiable and even considered part of the project. Candidates are expected to speak English, German is explicitly NOT required. Feel free to forward to interested parties. Cheers [0] https://de.wikipedia.org/wiki/Tarifvertrag_f%C3%BCr_den_%C3%B6ffentlichen_D…

9 years, 6 months

Re: [Jack-Devel] [LAD] updates

by Paul Davis

On Tue, Aug 25, 2015 at 3:38 PM, Fons Adriaensen <fons(a)linuxaudio.org> wrote: > On Tue, Aug 25, 2015 at 12:31:13PM -0400, Paul Davis wrote: > >> Indeed. I'm out for 2 weeks on vacation with only intermittent network >> access. Back next week. A pull request or a straightforward patch >> would make the next step much easier, but i'll deal with it one way or >> another. > > OK, enjoy the off-line time :-) I'll be doing the same from next friday > until 17 september (Greece, diving). > > I'll send you the output of git diff and the modified files, along with > some notes on how things are supposed to work. There are some open > questions that only someone very familiar with the code can resolve. Please send that diff.

9 years, 7 months

[Jack-Devel] jack2: issues w. 32bit clients in 64bit jackd since Fedora 22

by anders.vinjar＠bek.no

Hi all. After upgrading to fc22 during summer, I'm having issues with 32bit jack clients running in my 64bit jackd. I'd be thankful for any clues to what's going on, and ways to debug this. And if others would care to check, and confirm/disprove the same behavior, please tell me what you get. Here's what happens: The 32bit clients connect well, but the callbacks never seem to return, making jackd send out a steady stream of xruns and errors: JackEngine::XRun: client = simple_client was not finished, state = Triggered I'm checking with jack2 installed (jack-1.9.10), with .i686 and .x86_64 versions installed using the standard fedora packages. The same 32bit clients work well in fc21, fc20, and ubuntu 14.04 (in a vm on the same hardware). Afaik, nothing has changed vs. the -mixed flag in jackd, and would expect 32bit clients to run well inside a 64bit jackd. Checking with example-clients/simple-client.c from the jack sources: $ gcc -m32 -g -O -lm -ljack simple_client.c -o simple_client $ ./simple_client - results in the noted behavior. Without -m32 everything's fine. Thanks, -anders

9 years, 7 months

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