Linux-audio-dev January 2018

linux-audio-dev@lists.linuxaudio.org

13 participants
10 discussions

by Tim Goetze

http://quitte.de/dsp/caps.html The latest release of the caps audio plugin suite contains a number of bug fixes and improvements as well as changes intended to make it more suitable for low-power systems. http://quitte.de/dsp/caps.html#CHANGES Most notably, support for a variety of little-used features has been dropped, reducing the binary size by roughly a third. There's also a new plugin implementing simplistic linear emulation of several guitar amplifier loudspeaker cabinets with reduced computational complexity: http://quitte.de/dsp/caps.html#CabinetIII The compressor plugins now report current gain reduction: http://quitte.de/dsp/caps.html#Compress http://quitte.de/dsp/caps_0.9.24.tar.bz2 Cheers, Tim

6 years, 1 month

Best way to connect ALSA MIDI ports programmatically in Python?

by Jonathan E. Brickman

I need to connect ALSA MIDI programmatically, and will prefer to use Python. I perused a number of libraries, did not find an obvious great or best. Recommends? -- Jonathan E. Brickman jeb(a)ponderworthy.com (785)233-9977 Hear us at http://ponderworthy.comcom -- CDs and MP3 now available! Music of compassion; fire, and life!!!

6 years, 10 months

[Almat] CALL - Workshop-in-Exposition: Thresholds of the Algorithmic - ALMAT @ BEK

by IOhannes m zmölnig

Call for Applications: Workshop-in-Exposition: Thresholds of the Algorithmic Bergen (NO), June 2018. (sorry for x-posting -- please distribute) Algorithms have been used in music and sound art even before the emergence of “computer music” in the 1950s, but today we witness an entire new wave of interest, reflected in festivals, genres, publications and research projects. It is the very notion of algorithms that is shifting. They are no longer an abstract formalisation, but emerge from artistic praxis and experimentation and become entangled in it. Almat and BEK are happy to announce a call for participation in a workshop-in-exposition taking place in Bergen, Norway, June 2018. This will be a part of BEK and Notam’s ongoing series of workshops for advanced users. It is a hybrid format that places the workshop inside an exhibition context, where the exposed works and artefacts form the basis of the workshop’s activity. Instead of “closed works”, what is exposed to the general public are objects, sounds or installations that are open to engagement and reconfiguration during the workshop. Algorithms that Matter (Almat) is an artistic research project funded by the Austrian Science Fund FWF, PEEK AR 403-GBL, and based at the Institute of Electronic Music and Acoustics (IEM) in Graz, Austria. BEK and Notam are centers for innovation and use of technology in music and the arts in Norway. Both Notam and BEK have a strong focus on education, and strive to establish new goals and provide new impulses for current music technologists and artists. - https://almat.iem.at - http://www.bek.no - http://www.notam02.no - Full text of the call: https://almat.iem.at/assets/downloads/almat-bek_call2018.pdf - Application form: https://almat.iem.at/assets/downloads/almat-bek_form2018.pdf ## Theme and Format Thresholds are locations of transitions, points where one modality becomes another, where a qualitative change occurs. In physics the point where an aggregate state changes—the phase transition—is a distinguished transitional location were the properties of the adjacent states become evident. Similarly, in this workshop-in-exposition we want to study the properties of the algorithmic by putting ourselves in threshold positions and actively shape them. More than merely separating two sides, one can spend time on a threshold, move along a ridge, performing a tightrope walk while trying not to fall to either side. Situated within the Almat artistic research project, this event aims at bringing together practitioners and researchers in the field of digital art, sound art and computational aesthetics. The hybrid format of workshop-in-exposition puts on display works of the participants pertaining to the theme, and at the same time avails them for interrogation, discussion and reconfiguration during the week long workshop. The full call embeds a list of three different ‘thresholds’ from which the applicants should point out a specific one, that they recognise as being addressed by their own artistic work. This will act both as a point for further exploration during the workshop and as a bridge towards audience perception. ## Application Please read carefully the call and fill out the form provided at https://almat.iem.at/call2018.html and send it to almat(a)iem.at along with the required accompanying documents. We aim at a balance of gender and background of the applicants. Conditions: - Duration of exhibition: from 08 June to 17 June 2018 - Start date (in situ): 04 June 2018 (preparation and set up from 04 June to 08 June 2018) - End date: 17 June 2018 - Applicants must be present during the workshop. - Workshop fee must be paid by confirmed participants (see form) **Application deadline: 16 February 2018** (e-mail reception, 24:00 CET) If you have further questions, please do not hesitate to contact us at almat(a)iem.at. iem.at | kug.ac.at | bek.no | notam02.no | fwf.ac.at

6 years, 10 months

Synchronizig arg update in callback and process in main function

by Benny Alexandar

Hi, I have registered process callback and also a pointer to data struct as arg parameter. Whenever callback happens this arg is typecasted to data struct, and update the data struct. For eg every 20ms process callback happens and updated the data struct arg, and every 100ms main function reads the data struct. While reading and processing the data process callback can happen and update it. How to make sure when main function is reading data struct the process callback is not updated, or any other ways to synchronize these two ? Any example app for this. -ben

6 years, 10 months

Jackd & Real Time Kernel

by Benny Alexandar

Hi, I'm using ubuntu PC runs on Intel Core i7, 16 GB RAM. I downloaded the latest JACK audio server tarball and built successfully, and started using it. My requirement is to analyze input audio from line-in and do some processing and send to output. I just compiled simple_client.c and things starts to work. My doubt is do I need to install linux real-time kerel update for JACK. How do I know if jack is running real time, is it by checking for xruns ? -ben

6 years, 10 months

LAC 2018 : Call for Papers / Posters / Workshops/ Music Performances / Multimedia Installations

by David Runge

[Apologies for cross-postings] [Please distribute] Conference date: 7th - 10th June 2018 The Linux Audio Conference 2018 will be hosted at c-base, Berlin - in partnership with the Electronic Music Studio (TU Berlin) and Spektrum. https://lac.linuxaudio.org/2018 Deadline for all submissions: February 28th, 2018 (23:59 UTC) - - - 1: Call for Papers / Posters / Workshops LAC 2018 invites submissions of papers, posters and workshops addressing all areas of audio processing based on Linux and open source software. All submissions and presentations are in English. All submissions are peer reviewed by a committee of experts from different disciplines. Submissions can focus on technical, artistic or scientific issues and can target developers or users. For more details see the website: https://lac.linuxaudio.org/2018/pages/cfp/ Papers Papers must be written and presented in English. The length of papers is 4 to 8 pages, with up to 5 keywords, and an abstract of up to 200 words. Posters The poster presentations are based on paper submissions of 2-4 pages, with up to 5 keywords and an abstract of up to 150 words. Workshops The workshop presentation (max duration of 2h) should be 1-4 pages, with up to 5 keywords, and an abstract of up to 150 words to be published on the conference website. Submit a brief description of the workshop including URL (if available). How to submit? * Use the OpenConf online submission tool at https://lac.linuxaudio.org/2018/openconf * Select the relevant submission type ('_ PAPER _' / '_ POSTER _' / '_ WORKSHOP _') * The required file format is PDF, formatted for A4 paper. Authors are required to use the templates for paper formatting available as download on the conference website. * Please notify us if you need a special technical setup for your presentation. - - - 2: Call for Music Performances / Multimedia Installations LAC 2018 also invites submissions of Electroacoustic Works and Multimedia Installations. A jury will select the compositions and installations to be included in the conference program according to artistic merit and technical feasibility. Please be prepared to perform your work yourself and make sure that you have all resources needed to perform your piece at your disposal (e.g. instruments, other performers, etc.). Unfortunately, LAC 2018 cannot pay a fee neither for you nor for any additional performers, and LAC 2018 cannot organize or pay for travel or accommodation neither for you nor for any additional performers. All submissions are peer reviewed by a committee of experts in music and arts. Electroacoustic Works and Multimedia Installation can address all areas of digital audio and audiovisual art. Available Technical Setups For concerts, the LAC will provide the following equipment: * 8-channel - speaker setup * Stereo setup + video projection * Digital mixing desk Additional requests can not be guaranteed. How to submit? * Use the OpenConf online submission tool at https://lac.linuxaudio.org/2018/openconf * Select the submission type '_ PERFORMANCE _' * The required file format is PDF, formatted for A4 paper. It includes: * Description of the project program notes * Link to video or audio demonstration of the project * Technical rider of the work Important Dates * Deadline for all submissions: February 28th, 2018 (23:59 UTC) * Acceptance notification: March 31st, 2018 * Final deadline for 'camera ready' paper: April 15th, 2018 * Author registration deadline: April 15th, 2018 * Final program: May 1st, 2018 Up-to-date information regarding the conference can be found on its website: https://lac.linuxaudio.org/2018 Looking forward to seeing you in Berlin! The Linux Audio Conference 2018 team

6 years, 10 months

[ANN] QmidiCtl 0.5.1 - An Early Winter'18 Release

by Rui Nuno Capela

Hi there! Happy new year to y'all! I know I'm a little bit late on that, but can you _feel_ the news? No? There's _no fake news_ whatsoever! I'd let you solve the riddle by yourself as it's way more fun that way ;) QmidiCt 0.5.1 (early winter'18) released! QmidiCt [1] is a MIDI remote controller application that sends MIDI data over the network, using UDP/IP multicast. Inspired by multimidicast [6] and designed to be compatible with ipMIDI for Windows [7]. QmidiCt [1] has been primarily designed for the Maemo [8] enabled handheld devices, namely the Nokia N900 [9] and also being promoted to the Maemo Package [10] repositories. Nevertheless, QmidiCtl [1] may still be found effective as a regular desktop application as well. See also: QmidiNet [2] - A MIDI network gateway via UDP/IP multicast. Website: http://qmidictl.sourceforge.net https://qmidictl.sourceforge.io Project page: http://sourceforge.net/projects/qmidictl Downloads: http://sourceforge.net/projects/qmidictl/files - source tarball: http://download.sf.net/qmidictl/qmidictl-0.5.1.tar.gz - source package: http://download.sf.net/qmidictl/qmidictl-0.5.1-13.rncbc.suse.src.rpm - binary package: http://download.sf.net/qmidictl/qmidictl-0.5.1-13.rncbc.suse.x86_64.rpm - AppImage [11] package: http://download.sf.net/qmidictl/qmidictl-0.5.1-3.x86_64.AppImage - Android package: (*NEW*;) http://download.sf.net/qmidictl/qmidictl-0.5.1-3.apk https://play.google.com/store/apps/details?id=org.rncbc.qmidictl https://qmidictl.en.aptoide.com/ Git repos: http://git.code.sf.net/p/qmidictl/code https://github.com/rncbc/qmidictl.git https://gitlab.com/rncbc/qmidictl.git https://bitbucket.com/rncbc/qmidictl.git Change-log (since last QStuff* End-of-Autumn'17 release [12]): - A little hardening on the configure (autoconf) macro side. - A rather naive attempt to port to the Android-Qt platform; also introducing an (Android) Action Bar menu look-a-like. License: QmidiCt [1] is free, open-source Linux Audio [4] software, distributed under the terms of the GNU General Public License (GPL) version 2 or later [5]. References: [1] QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast http://qmidictl.sourceforge.net [2] QmidiNet - A MIDI Network Gateway via UDP/IP Multicast http://qmidinet.sourceforge.net [3] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [4] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [5] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [6] multimidicast - sends and receives MIDI from ALSA sequencers over network http://llg.cubic.org/tools/multimidicast [7] ipMIDI - MIDI over Ethernet ports - send MIDI over your LAN http://nerds.de [8] Maemo.org - Home of the Maemo community http://www.maemo.org [9] Maemo.org Wiki - Nokia N900 http://wiki.maemo.org/Nokia_N900 [10] Maemo.org - Downloads: QmidiCtl http://maemo.org/downloads/product/Maemo5/qmidictl [11] AppImage, Linux apps that run anywhere http://appimage.org/ [12] The QStuff* End of Autumn'17 Release http://www.rncbc.org/drupal/node/1876#qmidictl See also: http://www.rncbc.org/drupal/node/1881 Enjoy && keep the fun. -- rncbc aka. Rui Nuno Capela

6 years, 10 months

Increased single-box JACK performance using multiple servers, summary and status

by Jonathan E. Brickman

It is finally working, and in very repeatable fashion, three "soft" servers feeding to one connecting to real audio hardware. Test mode only so far. Next step is automated startup. Details: https://github.com/jebofponderworthy/MultiJACK/blob/master/README.md -- Jonathan E. Brickman jeb(a)ponderworthy.com (785)233-9977 Hear us at http://ponderworthy.comcom -- CDs and MP3 now available! Music of compassion; fire, and life!!!

6 years, 10 months

jack2-1.9.12

by Benny Alexandar

Happy New Year to all! I'm using the latest JACK version1.9.12. I compiled on Linux Ubuntu PC and used to capture audio and analyze. When I started with simple_client.c application, what I notices is the first buffer from Jack call back function is all zeros. Why is the first buffer not having valid audio samples ? Is this the expected behavior. I also like to know any features being planned for 2018 release of Jack ? -ben

6 years, 10 months

Meeting at c-base the 3rd of January

by Daniel Swärd

Hi. Tomorrow it's the monthly meeting at c-base again. I'll be in the c-base mainhall from 20:00. Things to discuss: Linux Audio Conference @ c-base Cheers. /Daniel

6 years, 11 months

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Linux-audio-dev January 2018