Linux-audio-user

linux-audio-user@lists.linuxaudio.org

3 participants
20662 discussions

Re: [LAU] multiJACK patch management: the first glimmerings

by Stéphane Letz

> > Message: 11 > Date: Wed, 6 Apr 2016 00:26:32 +0200 > From: Alexandre DENIS <contact(a)alexandredenis.net> > To: linux-audio-user(a)lists.linuxaudio.org > Subject: Re: [LAU] multiJACK patch management: the first glimmerings > of success > Message-ID: <20160406002632.19d7ee47@cocalight> > Content-Type: text/plain; charset="iso-8859-1" > > On Tue, 5 Apr 2016 22:27:46 +0200 > J?rn Nettingsmeier <nettings(a)stackingdwarves.net> wrote: > >> I have never used a graph as complex as Jonathan's, but I don't see >> how adding virtual machine and networking overhead could improve >> throughput when JACK2 should already parallelize everything that can >> be parallelized... Wouldn't the time be better spent to analyze >> JACK2's scheduling behaviour and catch bugs if there are any? > > Hi, > > Jack2 cannot parallelize processing if the graph is a pipeline: since > every stage depends on the data from previous stage, they must be run > in sequence. > > However, a pipeline may be parallelized if you trade parallelism > against latency. You can run each stage in parallel if they process > data from different periods. Jack2 doesn't do that by itself since it > would introduce uncontrolled latency. > > When you run multiple jackd and link them with netjack, you introduce > latency in the pipeline, which explains why you can have more > parallelism. However, it looks completely overkill to me and > introduces lots of overhead. > > I think it should be doable to write a simple client that connects as > two unrelated clients to jack, and feeds its outputs with its inputs > with one period of delay. It will make jack2 run the client connected > to its inputs and to its outputs in parallel, since jackd doesn't see > it as a dependency; but the latency of one period is unavoidable, since > we cannot predict whether jackd will invoke first the callback for the > inputs or for the output (or maybe at the same time on different > cores). Such a client should be no more than a few hundred lines of > code. > > -a. jackd2 has a « loopback » driver implemented since day 1 (OK maybe day 2….) - the code is in common/JackLoopbackDriver.cpp, h - it can be activated using the -L parameter like : jackd -L 4 -d also xxxxxx to add 4 loopback ports. Stéphane

9 years, 7 months

multiJACK patch management: the first glimmerings of success

by Mark D. McCurry

Chris Caudle wrote: > On Wed, April 6, 2016 2:49 am, Filipe Coelho wrote: > > If you have jack clients or plugins that heavily rely on mutexes, > > semaphores, conditions, etc the same thing might happen. > > That would be a buggy plugin design. > Seems it could be interesting to automate checking for some of that. I > thought maybe nm could help. Very much so. There's a large spread of software in linux audio which isn't realtime safe and correcting these issues is slow work. Half of the battle IMO is the spreading the information about what realtime safety is, why it is important, and how it should be achieved. > So is it possibly feasible to automate checking for non-realtime safe > function use in plugin binaries? I'm pretty confident it would not be > difficult to do with source, especially if you took the manual path of > finding the processing function by inspecting the code. In the case of C code it usually isn't too bad, but for C++ code it is still a very non-trivial task to perform the analysis even with the source available. As part of trying to correct these long standing issues within ZynAddSubFX one of the tools that I wrote starting back in 2012 was stoat: https://github.com/fundamental/stoat This tool uses llvm/clang to consume the source code and then construct the possible call graphs (missing only function pointers which are nearly possible to statically analyse). Using a combination of blacklists and whitelists you can say what functions/methods *should* be realtime safe and which ones are not safe. Based upon this information stoat identifies when a supposedly realtime safe function could call an unsafe function. This approach eliminates identifying calls to graphics libraries and threading locks which are never involved in the jack process callback. To clarify one other point in this thread, zyn is not absolutely 100% realtime safe and stoat can certainly point out the few remaining issues (there is a single location for memory allocation/deallocation which needs to be corrected (NO LOCKS)). Compared to yoshimi however it is an absolutely night and day difference. Based upon checking yoshimi's git again it should be essentially equal to the realtime safety that zyn had back at its 2.4.4 release: (unsafe function call graph) http://fundamental-code.com/2.4.4-realtime-issues.png Compare that to what was achieved for the 2.5.0 release of zyn: http://fundamental-code.com/2.5.0-realtime-issues.png Around 80% of those issues have been resolved within zyn since then. A similar analysis could be done easily on yoshimi following the instructions in stoat's README if someone is interested. --Mark McCurry (I just subbed for this, so hopefully I haven't messed up the threading)

9 years, 7 months

[ANN] Qtractor 0.7.6 - A Hazier Photon is released!

by Rui Nuno Capela

Hey, Spring'16 release frenzy [7] isn't over as of just yet ;) Keeping up with the tradition, Qtractor 0.7.6 (a hazier photon) is released! Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: http://qtractor.sourceforge.net Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://download.sf.net/qtractor/qtractor-0.7.6.tar.gz - source package: http://download.sf.net/qtractor/qtractor-0.7.6-24.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qtractor/qtractor-0.7.6-24.rncbc.suse.i586.rpm http://download.sf.net/qtractor/qtractor-0.7.6-24.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor Change-log: - Plug-ins search path and out-of-process (aka. dummy) VST plug-in inventory scanning has been heavily refactored. - Fixed and optimized all dummy processing for plugins with more audio inputs and/or outputs than channels on a track or bus where it's inserted. - Fixed relative/absolute path mapping when saving/loading custom LV2 Plug-in State Presets. License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [6] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [7] The Qstuff* Spring'16 Release Frenzy http://www.rncbc.org/drupal/node/1026 See also: http://www.rncbc.org/drupal/node/1028 Enjoy && Keep the fun, always. -- rncbc aka. Rui Nuno Capela

9 years, 7 months

[ANN] The Qstuff* Spring'16 Release Frenzy

by Rui Nuno Capela

Hi, On the wake of the miniLAC2016(a)c-base.org Berlin [14], and keeping up with tradition, the most venerable of the Qstuff* are under the so called Spring'16 release frenzy... Enjoy the party! - QjackCtl 0.4.2 - Qsynth 0.4.1 - Qsampler 0.4.0 - QXGEdit 0.4.0 - QmidiCtl 0.4.0 - QmidiNet 0.4.0 Details are as follows... **QjackCtl - JACK Audio Connection Kit Qt GUI Interface [1]** QjackCtl 0.4.2 (spring'16) released! QjackCtl [1] is a(n ageing but still) simple Qt [7] application to control the JACK [8] sound server, for the Linux Audio [12] infrastructure. Website: http://qjackctl.sourceforge.net Downloads: http://sourceforge.net/projects/qjackctl/files - source tarball: http://download.sf.net/qjackctl/qjackctl-0.4.2.tar.gz - source package: http://download.sf.net/qjackctl/qjackctl-0.4.2-25.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qjackctl/qjackctl-0.4.2-25.rncbc.suse.i586.rpm http://download.sf.net/qjackctl/qjackctl-0.4.2-25.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qjackctl/code https://github.com/rncbc/qjackctl Change-log: - Added a brand new "Enable JACK D-BUS interface" option, split from the old common "Enable D-BUS interface" setup option which now refers to its own self D-BUS interface exclusively. - Dropped old "Start minimized to system tray" option from setup. - Add double-click action (toggle start/stop) to systray (a pull request by Joel Moberg, thanks). - Added application keywords to freedesktop.org's AppData. - System-tray icon context menu has been fixed/hacked to show up again on Plasma 5 (aka. KDE5) notification status area. - Switched column entries in the unified interface device combo-box to make it work for macosx/coreaudio again. - Blind fix to a FTBFS on macosx/coreaudio platforms, a leftover from the unified interface device selection combo-box inception, almost two years ago. - Prevent x11extras module from use on non-X11/Unix plaforms. - Late French (fr) translation update (by Olivier Humbert, thanks). License: QjackCtl [1] is free, open-source Linux Audio [12] software, distributed under the terms of the GNU General Public License (GPL [13]) version 2 or later. **Qsynth - A fluidsynth Qt GUI Interface [2]** Qsynth 0.4.1 (spring'16) released! Qsynth [2] is a FluidSynth GUI front-end application written in C++ around the Qt framework [7] using Qt Designer. Website: http://qsynth.sourceforge.net Downloads: http://sourceforge.net/projects/qsynth/files - source tarball: http://download.sf.net/qsynth/qsynth-0.4.1.tar.gz - source package: http://download.sf.net/qsynth/qsynth-0.4.1-7.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qsynth/qsynth-0.4.1-7.rncbc.suse.i586.rpm http://download.sf.net/qsynth/qsynth-0.4.1-7.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qsynth/code https://github.com/rncbc/qsynth Change-log: - Dropped old "Start minimized to system tray" option from setup. - CMake script lists update (patch by Orcan Ogetbil, thanks). - Added application keywords to freedesktop.org's AppData. - System-tray icon context menu has been fixed/hacked to show up again on Plasma 5 (aka. KDE5) notifications status area. - Prevent x11extras module from use on non-X11/Unix plaforms. - Messages standard output capture has been improved in both ways a non-blocking pipe may get. - Regression fix for invalid system-tray icon dimensions reported by some desktop environment frameworks. License: Qsynth [2] is free, open-source Linux Audio [12] software, distributed under the terms of the GNU General Public License (GPL [13]) version 2 or later. **Qsampler - A LinuxSampler Qt GUI Interface [3]** Qsampler 0.4.0 (spring'16) released! Qsampler [3] is a LinuxSampler [11] GUI front-end application written in C++ around the Qt framework [7] using Qt Designer. Website: http://qsampler.sourceforge.net Downloads: http://sourceforge.net/projects/qsampler/files - source tarball: http://download.sf.net/qsampler/qsampler-0.4.0.tar.gz - source package: http://download.sf.net/qsampler/qsampler-0.4.0-17.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qsampler/qsampler-0.4.0-17.rncbc.suse.i586.rpm http://download.sf.net/qsampler/qsampler-0.4.0-17.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qsampler/code https://github.com/rncbc/qsampler Change-log: - Added application keywords to freedesktop.org's AppData. - Prevent x11extras module from use on non-X11/Unix plaforms. - Messages standard output capture has been improved again, now in both ways a non-blocking pipe may get. - Single/unique application instance control adapted to Qt5/X11. License: Qsampler is free, open-source Linux Audio [12] software, distributed under the terms of the GNU General Public License (GPL [13]) version 2 or later. **QXGEdit - A Qt XG Editor [4]** QXGEdit 0.4.0 (spring'16) released! QXGEdit [4] is a live XG instrument editor, specialized on editing MIDI System Exclusive files (.syx) for the Yamaha DB50XG and thus probably a baseline for many other XG devices. Website: http://qxgedit.sourceforge.net Downloads: http://sourceforge.net/projects/qxgedit/files - source tarball: http://download.sf.net/qxgedit/qxgedit-0.4.0.tar.gz - source package: http://download.sf.net/qxgedit/qxgedit-0.4.0-7.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qxgedit/qxgedit-0.4.0-7.rncbc.suse.i586.rpm http://download.sf.net/qxgedit/qxgedit-0.4.0-7.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qxgedit/code https://github.com/rncbc/qxgedit Change-log: - Prevent x11extras module from use on non-X11/Unix plaforms. - French (fr) translations update (by Olivier Humbert, thanks). - Fixed port on MIDI 14-bit controllers input caching. License: QXGEdit [4] is free, open-source Linux Audio [12] software, distributed under the terms of the GNU General Public License (GPL [13]) version 2 or later. **QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast [5]** QmidiCtl 0.4.0 (spring'16) released! QmidiCtl [5] is a MIDI remote controller application that sends MIDI data over the network, using UDP/IP multicast. Inspired by multimidicast (http://llg.cubic.org/tools) and designed to be compatible with ipMIDI for Windows (http://nerds.de). QmidiCtl has been primarily designed for the Maemo enabled handheld devices, namely the Nokia N900 and also being promoted to the Maemo Package repositories. Nevertheless, QmidiCtl may still be found effective as a regular desktop application as well. Website: http://qmidictl.sourceforge.net Downloads: http://sourceforge.net/projects/qmidictl/files - source tarball: http://download.sf.net/qmidictl/qmidictl-0.4.0.tar.gz - source package: http://download.sf.net/qmidictl/qmidictl-0.4.0-8.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qmidictl/qmidictl-0.4.0-8.rncbc.suse.i586.rpm http://download.sf.net/qmidictl/qmidictl-0.4.0-8.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qmidictl/code https://github.com/rncbc/qmidictl Change-log: - Added application keywords to freedesktop.org's AppData. License: QmidiCtl [5] is free, open-source Linux Audio [12] software, distributed under the terms of the GNU General Public License (GPL [13]) version 2 or later. **QmidiNet - A MIDI Network Gateway via UDP/IP Multicast [6]** QmidiNet 0.4.0 (spring'16) released! QmidiNet [6] is a MIDI network gateway application that sends and receives MIDI data (ALSA-MIDI [9] and JACK-MIDI [8]) over the network, using UDP/IP multicast. Inspired by multimidicast and designed to be compatible with ipMIDI for Windows. Website: http://qmidinet.sourceforge.net Downloads: http://sourceforge.net/projects/qmidinet/files - source tarball: http://download.sf.net/qmidinet/qmidinet-0.4.0.tar.gz - source package: http://download.sf.net/qmidinet/qmidinet-0.4.0-9.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qmidinet/qmidinet-0.4.0-9.rncbc.suse.i586.rpm http://download.sf.net/qmidinet/qmidinet-0.4.0-9.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qmidinet/code https://github.com/rncbc/qmidinet Change-log: - Allegedly fixed for the socketopt(IP_MULTICAST_LOOP) reverse semantics on Windows platforms (as suggested by Paul Davis, from Ardour ipMIDI implementation, thanks). - Added application keywords to freedesktop.org's AppData. License: QmidiNet [6] is free, open-source Linux Audio [12] software, distributed under the terms of the GNU General Public License (GPL [13]) version 2 or later. References: [1] QjackCtl - A JACK Audio Connection Kit Qt GUI Interface http://qjackctl.sourceforge.net [2] Qsynth - A fluidsynth Qt GUI Interface http://qsynth.sourceforge.net [3] Qsampler - A LinuxSampler Qt GUI Interface http://qsampler.sourceforge.net [4] QXGEdit - A Qt XG Editor http://qxgedit.sourceforge.net [5] QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast http://qmidictl.sourceforge.net [6] QmidiNet - A MIDI Network Gateway via UDP/IP Multicast http://qmidinet.sourceforge.net [7] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [8] JACK Audio Connection Kit http://jackaudio.org [9] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [10] FluidSynth - A SoundFont Synthesizer A real-time software synthesizer based on SoundFont 2 specifications http://www.fluidsynth.org [11] LinuxSampler - The Linux Sampler Project A modular, streaming capable, realtime audio sampler http://www.linuxsampler.org [12] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [13] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [14] miniLAC2016(a)c-base.org Berlin miniLAC is a compact, community-driven version of the Linux Audio Conference http://minilac.linuxaudio.org/ http://lac.linuxaudio.org/ See also: http://www.rncbc.org/drupal/node/1026 Enjoy && keep the fun, always! -- rncbc aka. Rui Nuno Capela

9 years, 7 months

ams-lv2

by Aurélien Leblond

Hello all, I was wondering if there was others around using the set of plugins ams-lv2 and maybe even comparing it with Alsa Modular Synth itself? They have been around for a while now, I'm happily using them regularly but feedback would be great! Aurélien

9 years, 7 months

open source projects on Musikmesse

by Gabriel

Hello, anybody knows about any open source projects which will be presenting at this year's Musikmesse in Frankfurt? Gabriel

9 years, 7 months

some music for piano

by Dave Phillips

Greetings, I've been writing music for piano recently. 3 Character Pieces (5 minutes) https://soundcloud.com/davephillips69/3-character-pieces Tune 12 (3 minutes) https://soundcloud.com/davephillips69/tune-12 Sonata for Sequenced Piano (11'30") https://soundcloud.com/davephillips69/sonata-for-sequenced-piano The character pieces are tonal/atonal, not too severe. Tune 12 is tonal, but its harmonies are built on a series of three discrete 4-note chords. The sonata is definitely tonal/atonal, with some severe contrasts (it's a sonata). Btw, only Tune 12 is humanly playable. Think of the others as my way of sending props to the spirit of Conlon Nancarrow. :) The piano sounds are by the awesome Pianoteq. All pieces are download-enabled. Best regards, dp

9 years, 7 months

Re: [LAU] some music for piano

by Dave Phillips

On 04/04/2016 11:35 PM, Ken Dawson wrote: > Dave, > > I must be missing something. The download button seems to require a > login. Is there another way to download? > > Hi Ken, I checked it myself this morning, but I'm auto-logged into SC so I couldn't verify how it behaves if you don't have an account. Anyway, I've uploaded the pieces (flac-encoded) to my ftp site at linux-sound.org : http://linux-sound.org/audio/3characters.flac http://linux-sound.org/audio/sonata.flac http://linux-sound.org/audio/tune12.flac Let me know if you have any problems retrieving those files. Best, dp

9 years, 7 months

Musikmesse

by Gianfranco Ceccolini

Hi everyone As some of you might know, part of the MOD Team is going to be at the Musikmesse from April 7th to 10th. Unfortunately it clashes with the miniLAC so, differently from last year’s LAC, we won’t be present at the Conference with the entire team as we did last year. For those who won’t be able to attend the miniLAC but can get a day trip, we have available some courtesy visitor one-day-passes to the Musikmesse. They are valid in any of the days form 7th to 10th. If anyone is interested just let us know and we’ll manage a way to hand them over. Best Gianfranco Ceccolini MOD Devices +49 160 646 9313 gianfranco(a)moddevices.com

9 years, 7 months

io GNU/Linux 2016.02 out

by Manu Kebab

Hi :) A new release of io GNU/Linux is available for downloads (32 and 64-bits) Features: * Fully configured system for live and/or install * Kernels 4.4.6 and 4.4.6-rt * Enlightenment e20 as window manager * All sounds through Jack2 * Hundred of audio, graphics, video, internet, utilities and system programs. Get it at http://io.gnu.linux.free.fr/ if the homepage goes slow for you, please check: https://sourceforge.net/projects/io-gnu-linux Feedbacks welcome, enjoy :) MK

9 years, 7 months

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

Linux-audio-user