Linux-audio-dev

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7535 discussions

[LAD] DAFx16 - Digital Audio Effects Conference - Call for papers

by Vaclav Mach

*Call for papersdafx16_logo* We are pleased to announce that the 19th International Conference on Digital Audio Effects (DAFx16) will be held at the Brno University of Technology in Brno, Czech Republic, on September 5–9 2016. DAFx-16 <http://dafx16.vutbr.cz/cfp.html> is organized by the Brno University of Technology, Faculty of Electrical Engineering and Communication, and the Signal Processing Laboratory. The conference will be hosted at the university facilities and will feature oral and poster presentations of accepted papers, keynote addresses, tutorials/demonstrations and a social program. This annual conference is a coming together of those working across the globe in research relating to digital audio processing for music and speech, sound art, acoustics and related applications. We would like to invite submissions of papers for presentation at DAFx-16 within the following general areas: * Capture and analysis * Representation, transformation and modelling * Transmission and resynthesis * Effects and manipulation * Perception, psychoacoustics and evaluation * Spatial sound analysis, coding and synthesis * Source separation * Physical modelling, virtual acoustic and analogue models * Sound synthesis, composition and sonification * Hardware and software design At DAFx-16 we especially encourage submissions addressing: * Real-time applications of digital audio processing * 3D audio techniques * Sparse and low-rank audio representations Submissions are alsowelcomed for a special session on sound synthesis organized by Vesa Välimäki and Josh Reiss, which will focus on high impact advances on the state of the art. Prospective authors are invited to submit full-length papers, 8 pages maximum, for both oral and poster presentations, before March 17th, 2016. Submitted papers must be camera-ready and conform to format specified in the templates and the instructions available at the DAFx16 website. All submissions are subject to peer review. Acceptance may be conditional upon changes being made to the paper as directed by reviewers. Final versions of the accepted contributions will be published in the conference proceedings distributed to all registered delegates at the conference site and will be made freely accessible on the conference website after the conference closure. The proceedings will be submitted to ISI and Scopus indexing services. Important dates: Special session proposal: January 15th, 2016 *Full-Paper Submission:** **March 17th, 2016* Notification of Acceptance: May 18th, 2016 Final Paper Submission: June 2nd, 2016 Website: http://dafx16.vutbr.cz Best regards, the organizing team: Jiri Schimmel, General Chair (Brno University of Technology) Pavel Rajmic, Paper Chair (Brno University of Technology) Vaclav Mach, Technical Coordinator (Brno University of Technology) Jan Karasek, Social Events Coordinator (BioVendor Instruments)

10 years, 3 months

[LAD] GSequencer v0.7.0 providing programming libraries

by Joël Krähemann

Hi I've just released GSequencer v0.7.0 what provides you reusable libraries. http://gsequencer.org/download.html * libags * libags-thread * libags-server * libags-audio * libags-gui * libgsequencer The documentation is some kind of out-dated. Would be great if someone would show me interests in reusing libags-audio or alike to improve the docs. bests, Joël

10 years, 4 months

[LAD] still can't mix with frotz

by dave＠661.org

Building upon what I learned back in April about mixing, I've managed to get all my inputs into the same formats for output. I've made some developments in getting stuff to correctly play individually, but mixing is still beyond me. playaiff() Waits for semaphore audio_empty, then gets mutex. Then fills bleepbuffer with 2-channel, 16-bit, 44100Hz float audio data from an AIFF chunk. When the buffer is full, it puts up the audio_full semaphore and releases the mutex. While there are still data to process, the global bleep_playing is true. A thread is spawned for this whenever an AIFF chunk must be played. It terminates when the chunk is done playing. playmusic() Calls either playmod() or playogg() depending on what kind of chunk has been passed to it. Those two functions are the same as playaiff() except they handle MODs or OGGs. While there are still data to process, the global music_playing is true. A thread is spawned for this whenever a MOD or OGG chunk must be played. It terminates when the chunk is done playing. mixer() Waits for the audio_full semaphore, then gets mutex. If bleep_playing is true and music_playing is false, convert bleepbuffer (floats) to shortbuffer (shorts) and play shortbuffer with ao_play(). If bleep_playing is false and music_playing is true, convert musicbuffer (floats) to shortbuffer (shorts) and play shortbuffer with ao_play(). If both bleep_playing and music_playing are true, then step through bleepbuffer[i] and add musicbuffer[i]. Convert bleepbuffer to shorts and play shortbuffer. A thread is spawned for this on startup and runs until the main thread terminates. Now, the trouble. If I start music in the form of a MOD chunk, then play an AIFF, I get a distorted mix and then the music keeps going on cleanly. Subsequent AIFF plays perform the same whether or not the MOD is playing. If I start music in the form of an OGG chunk, then play an AIFF, I get a distorted mix, then a harsh screech for a few more seconds, and then maybe a segfault. What is wrong with my mixer? Here's the latest code: https://github.com/DavidGriffith/frotz/blob/ao-curses/src/curses/ux_audio.c These libraries are necessary: install libao, libvorbis, libncurses, libmodplug, and libsamplerate. Test program is at http://661.org/if/story.zblorb There are three buttons: red, green, and blue. Pressing these will cause an AIFF to play. There is a Commodore 64 that plays an OGG. The Amiga will play a MOD. Pressing the "off" button will turn off all sounds. Just turning off the music maker won't work. That's another problem for which I do not need assistance. Red button: 2-channel, 16-bit, 44100Hz Green button: 1-channel, 8-bit, 11025Hz Blue button: 1-channel, 8-bit, 11025Hz Tests are as follows: ! Pressing red, green, or blue buttons results in different noises. > PRESS RED BUTTON You press the red button. ! quit and restart > TURN ON COMMODORE 64 You turn on the Commodore 64 and it immediately begins playing the tune from the game Sanxion. ! At this point, pressing one of the colored buttons will cause a ! distorted mix and usually a segfault. ! quit and restart > TURN ON AMIGA You turn on the Commodore Amiga and it immedately begins playing an old time MOD file. > PRESS BLUE BUTTON You press the blue button. ! Here there is a distorted mix that runs a bit slower than it should. ! When the noise produced by the colored button completes, the MOD file ! music continues with no more distortion. Pressing a colored button ! again will result in the same distortion and then the MOD continues as ! before. -- David Griffith dave(a)661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

10 years, 4 months

[LAD] Offering my software skills in London - ZynAddSubFX and Paulstretch creator

by Paul Nasca

Hi. As I live in London, I would like to offer my skills and abilities as a software developer to a company nearby. What companies/start-ups would you recomand? Please email me for details. P.S. No recruitment agencies, please. Thank you. Paul Nasca, creator of ZynAddSubFX and Paulstretch http://www.paulnasca.com

10 years, 4 months

[LAD] [ANN] Qtractor 0.7.1 - The Meson Dope beta release

by Rui Nuno Capela

Hey, Here's to all southerners for whom the so called Summer'15 didn't made much sense... Beg your pardon yet and again, but it's that time of year when grapefruit is about ripening, pretty fast and maybe late, at least on the northern hemisphere. No worries: harvesting has already been carried away. So it's your call now, wether it makes for ugly bad wine or, pretty good vinegar... "Quickly, bring me a beaker of wine so that I may wet my mind and say something clever." --Aristophanes never mind, Qtractor 0.7.1 (meson dope beta) is released! Now, for the clueless: 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. And for the ones who can aptly tell a TL;DR apart from a hangover: Besides the incidental bug-fixes and proverbial business-as-usual stance for this dot release, the most probable and hopefully significant news about it, is that this will the last to build against Qt4 by default. The time has come to move on up to Qt5. Remember that a Qt5 build is and has been possible already for ages now but somewhat relegated on a subpar status due to the once lack of support for all non-Qt5 LV2 plug-ins GUIs out there. Not anymore! Starting from this very release onwards there's this so called <em>native</em> LV2 GTK2 and X11 UI support on Qt5. Also thriving, drobilla's libsuil is being updated to par just that as well. So things are all aligning up nigh. A special note to the voluntary packager: if you choose, for any reason you may find commendable, to build, package and distribute a Qt5 build (via ./configure --enable-qt5 ...) please be sure that every LV2 plug-ins around that take Qt as its UI framework are also build, packaged and distributed on the same premises, otherwise they might just fail and crash Qtractor [1] on show. Among those are of course the one comprised by the 'Vee One Suite', namely synthv1 [9], samplv1 [10] and drumkv1 [11], of course. Also as a(nother) side note: It has been for quite some time there's an alternate github.com [7] repository which is kept in sync with the sf.net one [8]. However, this doesn't mean that the Qtractor [1] project is about to migrate to brand new hosting whatsoever: the original upstream source code repository is, will be, as ever was, always kept somewhere else still in this world and universe. It's a Git [12] world out nowadays and as the mottos says, --everything-is-local, --distributed-is-the-new-centralized ;) Enjoy. Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://www.rncbc.org/archive/qtractor-0.7.1.tar.gz - source package (openSUSE 13.2): http://www.rncbc.org/archive/qtractor-0.7.1-19.rncbc.suse132.src.rpm - binary packages (openSUSE 13.2): http://www.rncbc.org/archive/qtractor-0.7.1-19.rncbc.suse132.i586.rpm http://www.rncbc.org/archive/qtractor-0.7.1-19.rncbc.suse132.x86_84.rpm - wiki (help wanted!): http://sourceforge.net/p/qtractor/wiki/ Weblog (upstream support): http://www.rncbc.org 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. Change-log: - Fixed an ages old MIDI track/channel instrument mapping (bank, program) issue that prevented normal all-shut-up messages from being sent to MIDI output buses/ports on playback stop. - Messages standard output capture has been improved again, now in both ways a non-blocking pipe may get. - Fixed port on MIDI 14-bit controllers input caching. - Fixed false value readings on the MIDI clip editor (aka. piano-roll) tool-tips, when dragging a note velocity or controller value outside the acceptable nominal range (eg. 0-127). - Added LV2_BUF_SIZE__nominalBlockLength option support (patch by falktx aka. Filipe Coelho, thanks). - Fixed wrong initial tempo/time-signature display when session is loaded from command line. - LV2 plug-in UI GTK2 and X11 in Qt5 host native support added. - Transport/Auto Backward feature now honoring (auto return) to same current location precedence as Transport/Backward. - Single/unique application instance control adapted to Qt5/X11 (cf. configure --enable-xunique). - MIDI Tools/Transpose, Resize duration display format (frames, time or BBT) have been fixed. - Build fix for Qt5.5 (patch by KaOS, thanks). - MIDI Tools/Quantize et al. are tentatively being corrected to take event times as relative to THE beginning of session, instead of MIDI clip start location. 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] Qtractor Git repository on github.com http://github.com/rncbc/qtractor [8] Qtractor Git repository on sourceforge.net http://git.code.sf.net/p/qtractor/code [9] synthv1 - an old-school polyphonic synthesizer http://synthv1.sourceforge.net/ [10] samplv1 - an old-school polyphonic sampler http://samplv1.sourceforge.net/ [11] drumkv1 - an old-school drum-kit sampler http://drumkv1.sourceforge.net/ [12] Git distributed version control system http://git-scm.com See also: http://www.rncbc.org/drupal/node/960 Enjoy && have fun. -- rncbc aka. Rui Nuno Capela

10 years, 4 months

[LAD] QMidiArp-0.6.2 released

by Frank Kober

Hello all, This qmidiarp release dares to come about a year after the last one...and yet again: not much new stuff, but some more bugs squeeeezed, thanks to some courageous reporters. And, after all, it's a lifesign isn't it? In other words, updating is of course highly recommended. Have fun with QMidiArp 0.6.2, below are the list of changes and links Frank ----- qmidiarp-0.6.2 (2015-10-06) Fixed Bugs o Arp: Regression: Latch mode caused the first note playing on forever and other annoyances (Bug #12 reported by Alois Cochard) o Seq: Small position error of the helper tick line relative to the notes placed o Seq: Note length values saved to file were not correct and had no correct default (Bug #14 reported by Steve Grace) o LV2 Seq and Lfo: Display was not correct when diminishing resolution or length in plugin UI Minor improvement o LV2 Seq: Vertical zoom values are part of the controls and therefore saved in presets as well ----- QMidiArp is a MIDI arpeggiator, phrase generator and controller LFO for JACK and ALSA. It can run multiple synchronized arpeggiators, LFOs and step sequencers. The modules are also available as LV2 plugins with Qt user interface. All in all it is a handy live tool. Website http://qmidiarp.sourceforge.net/ Download http://sourceforge.net/projects/qmidiarp/files/qmidiarp/0.6.2/qmidiarp-0.6.… There is now also a github repo that will be kept in sync with the sf repo for the time being https://github.com/emuse/qmidiarp

10 years, 4 months

[LAD] click on connection graph change

by Andrew Yates

Hi all, When I change the track routing in ardour I get a small click in the main audio. Examples would be when routing drum tracks through a sub-group, or changing the side chain input to a compressor. Is this expected behaviour or is this due to a configuration problem with jack? Thanks Andy

10 years, 4 months

[LAD] [OT] Coursera: Audio Signal Processing for Music Applications

by Dave Phillips

Saw this announced on the Linux Musicians site, thought it may be of interest to some folks here. (Sorry if it's a repost). https://www.coursera.org/course/audio Instructors are professors Xavier Serra and Julius O. Smith III, two very well-known DSP worthies. Course syllabus : Week 1: Introduction; basic mathematics Week 2: Discrete Fourier transform Week 3: Fourier transform properties Week 4: Short-time Fourier transform Week 5: Sinusoidal model Week 6: Harmonic model Week 7: Sinusoidal plus residual modeling Week 8: Sound transformations Week 9: Sound/music description Week 10: Concluding topics; beyond audio signal processing Best, dp

10 years, 4 months

[LAD] Three academic job openings at soundjack.eu

by Adrian Knoth

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…

10 years, 4 months

[LAD] Segfault with liblrdf if raptor is compiled with curl support

by Tito Latini

Hello, I want to propose the follow flag for raptor in liblrdf library: #if RAPTOR_VERSION >= 20000 raptor_world_set_flag(world, RAPTOR_WORLD_FLAG_WWW_SKIP_INIT_FINISH, 1); #endif before raptor_world_open() is called (explicitly or implicitly), for example after raptor_new_world() in lrdf_init(). That flag avoids to call curl_global_init() (not thread-safe) in raptor_www_init() and curl_global_cleanup() in raptor_www_finish(). Rare but possible (I'm lucky), if raptor is compiled with curl support, I have experienced the follow crash during Rosegarden startup: #0 0x00007ffff0a84f39 in lh_insert () from /lib64/libcrypto.so.1 #1 0x00007ffff0a087ba in OBJ_NAME_add () from /lib64/libcrypto.so.1 #2 0x00007ffff0a94cf8 in OpenSSL_add_all_ciphers () from /lib64/libcrypto.so.1 #3 0x00007ffff0a94cae in OPENSSL_add_all_algorithms_noconf () from /lib64/libcrypto.so.1 #4 0x00007ffff1acf20c in ?? () from /usr/lib64/libcurl.so.4 #5 0x00007ffff1ad605a in curl_global_init () from /usr/lib64/libcurl.so.4 #6 0x00007ffff22cc0fa in raptor_www_init () from /usr/lib64/libraptor2.so.0 #7 0x00007ffff22c9ef0 in raptor_world_open () from /usr/lib64/libraptor2.so.0 #8 0x00007ffff22c63f1 in raptor_new_uri () from /usr/lib64/libraptor2.so.0 #9 0x00007ffff5d26701 in lrdf_read_file_intl () from /usr/lib64/liblrdf.so.2 #10 0x00007ffff5d27626 in lrdf_read_file () from /usr/lib64/liblrdf.so.2 #11 0x00000000004d8d79 in Rosegarden::LADSPAPluginFactory::discoverPlugins() () The code is a simple lrdf_init, for-loop of lrdf_read_file, lrdf_cleanup, and curl seems useless to read/manipulate rdf files for LADSPA plugins. I have recompiled raptor without curl support --with-www=xml to use libxml, so the only work in raptor_www_init() is to set world->www_initialized = 1; without the call for curl_global_init().

10 years, 4 months

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Linux-audio-dev