Linux-audio-dev October 2011

linux-audio-dev@lists.linuxaudio.org

40 participants
29 discussions

LAC 2012 - Save the date: April 12-15 at CCRMA/Stanford University

by Bruno Ruviaro

Save the date! Linux Audio Conference, April 12-15, 2012 @ CCRMA/Stanford University The Linux Audio Conference (LAC) is an international conference that brings together musicians, sound artists, software developers and researchers, working with Linux as an open, stable, professional platform for audio and media research and music production. LAC includes paper sessions, workshops, and a diverse programme of music. The upcoming 2012 conference will be hosted at CCRMA, Stanford University, on April 12-15. Stay tuned for more details on how to submit your work online. The website will be up and running by mid-October. The Center for Computer Research in Music and Acoustics (CCRMA) at Stanford University is a multi-disciplinary facility where composers and researchers work together using computer-based technology both as an artistic medium and as a research tool. CCRMA has been using and developing Linux as an audio platform since 1997. http://ccrma.stanford.edu Stanford is located in the heart of Silicon Valley, about one hour south of San Francisco, California. This is the first time LAC will take place in the United States.

12 years, 6 months

[ANN] rtirq update

by Rui Nuno Capela

greetings, rtirq, the init script that automagically tunes up your system for audio, has been updated as much for better avoid duplicates when alsa device drivers share their irq line with something else. here you can find the upstream tarballs: http://www.rncbc.org/jack/#rtirq or, this very latest: http://www.rncbc.org/jack/rtirq-20111007.tar.gz nb. rtirq only applies to preempt_rt or threadirqs enabled kernels (>= 2.6.39) byee -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

12 years, 6 months

LV2 AMS Plugins

by Aurélien Leblond

Hi everyone, I posted the first version of some of the internal AMS plugins ported to LV2. So far, only the following have been ported: - Analog Driver - Amp - LFO - Noise2 - VCF - VCO2 Please note that the code is extremely raw, and so far I think it makes sense only to run these plugins in Ingen. Any comments or advises, feel free :) Oh, and here is the URL: http://sourceforge.net/projects/avwlv2/files/ Aurélien

12 years, 6 months

Re: [LAD] Internally representing pitch : A new approach

by Jeff McClintock

Don't base anything on 7-bit MIDI, it's too low-fi for a modern system, plus it's keyboard-centric (i.e the concept of each note 'stuck' at a single pitch is too restrictive). Plus it's being replaced by hi-def MIDI. My suggestions: * Use at least 32-bit floating point to represent pitch to give high accuracy. * Base pitches internally on octaves. E.g. 440Hz = 'octave 0.0', 880Hz = 'octave 1.0' etc. An octave is a fundamental unit of pitch which is not biased to any particular tuning system. Don't use plain frequency in Hertz, Hz are very un-musical because they do not scale the same way as our ear perceives pitch. * Separate the concept of 'key number' and 'pitch' (MIDI seems to confuse people on this point). A key-number is NOT pitch and vice versa. This is so you can... * Support two 'keys' playing the same pitch, this is critical for stringed instruments like guitars. * Support 'bending' pitch on each note independently. * Support the concept of re-triggering a voice that's already playing, this is important for any percussive instrument. E.g. hitting a cymbal twice in quick succession should not trigger the sound of two cymbals playing together. Best Regards, Jeff SynthEdit

12 years, 6 months

[ANN] Qtractor 0.5.1 - The Bravo Yankee return!

by Rui Nuno Capela

Howdy, Summer is now long gone, obviously fall has already begun. As winter looms on the horizon the year steadily marches into its due end. (oh crap!...) Today marks the day of this second public release while on the TYOQA age. It also marks yet another birthday of mine. One more year's gone, one less to go. Be happy! I hope you'd like my party as soon you get over from yesterday's bitten fruit showtime. Now's the time... Qtractor 0.5.1 (bravo yankee) is out! Yes, it's "bravo" alright, not "beta" nor anything else. Despite any previous existing codename. Now, it's all dumb-down easy to predict any next release codenames, a matter of convergence and fact that just chalks one less of a burden on me :) Believe it or not, this is the best and, allegedly, the most stable release ever. Ain't them all? ;) Release highlights: * Linked (aka. ref-counted) audio/MIDI clips (NEW) * Aux-Send pseudo-plugin (NEW) * Direct-access plugin parameter slider (NEW) * MIDI file player (NEW) * Automatic time-stretching of audio clips on tempo-map changes (FIX) * Improved native Linux VST support (FIX) * Improved JACK-Session support (FIX) * Improved generic plugin form (FIX) * MIDI-fx plugin support (NEW) * Audio bus/ports auto-connect option (NEW) * First translation call (Czech) (NEW) Cheers! Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: - source tarball: http://downloads.sourceforge.net/qtractor/qtractor-0.5.1.tar.gz - source package (openSUSE 11.4): http://downloads.sourceforge.net/qtractor/qtractor-0.5.1-4.rncbc.suse114.sr… - binary packages (openSUSE 11.4): http://downloads.sourceforge.net/qtractor/qtractor-0.5.1-4.rncbc.suse114.i5… http://downloads.sourceforge.net/qtractor/qtractor-0.5.1-4.rncbc.suse114.x8… - from the paleolithic shelves: user manual: http://downloads.sourceforge.net/qtractor/qtractor-0.3.0-user-manual.pdf Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - More LADISH support: SIGTERM signal is now trapped for graceful application close. - Improved paste-repeat snap precision when dealing with large repeat counts. - Czech (cs) translation added, by Pavel Fric. - Added a few snap-to-beat divisors (unusual Beat/5, Beat/7, Beat/9 and Beat/10) for completeness sake. - Such a simple change of mind with a visual twist: the "A" track automation button/menu has now been - moved to the right-most, as it belongs ;) - Auto-connection of dedicated audio outputs is now optional for default audio master bus, metronome, player and MIDI instrument plugin dedicated audio outputs. - Finally, after a pitiful large brain-dead period, generic plugin forms are now showing all possible controllable plugin parameters featuring a paged, tabbed dialog, whenever applicable. - Special hack/fix for JUCE based native VST plugins, which are the most actually found with a GUI editor, skipping explicit shared library unloading and thus avoiding some mysterious crashes on session close and/or application exit. - Support for MIDI-fx plugins (native VST and/or LV2) is now implemented and functional (intra-chain only). - Instrument plugin bank/program selection was found broken or dead in the water, specially on VSTi, now finally fixed again. - VST plugin parameter value display on generic form is now back in business (were dead regarding value changes). - All plugin's provided GUI editors are now honored by being popped up first, instead of the usual but good old generic plugin form. - Long overdue implementation of a dedicated MIDI file player is now accessible from the MIDI files widget; one can play the whole SMF or just a single track or channel. - Update to a newer VeSTige header, probably fixing an old 32 vs. 64 bit mismatch. - Avoid JACK session filenames/paths to be ever shown; also avoid all buses ports (re)connections when JACK sessions are (re)loaded, given the fact that session management will take care of just that; more also, untitled/default session names are now also picked up to match current LADISH project name, obviously given by LADISH_PROJECT_NAME environment variable, whenever present (as suggested by Nedko Ardaunov). - Paste-repeat floating selection has been fixed (was showing only the last repeated selection). - Coherence of tempo changes on audio and MIDI clips, whether automatic time-stretching is in effect, has been slightly improved, hopefully fixed. - Bold attempt to get linked (aka. ref-counted) audio and MIDI clips into practice (EXPERIMENTAL). - Main track view now showing all clips above the grid. - Added support for both new and older (deprecated URI) lv2_external_ui extension (by Nedko Ardaunov). - Following yet another great idea, and implementation, by Holger Dehnhardt, who already brought us the new aux-send insert plugin, thanks again, the so-called direct access control option is now featured for any plugin parameter right from plugin listings eg. mixer strips. - General resource consumption and management has been slightly improved, due to internal buses allocation optimization. - Fixed nasty crash-bug that was severely affecting all sessions that had at least one insert (pseudo-)plugin on any audio input bus. - All automation curve nodes are now relocated whenever disparate session sample-rate is detected on load. - New aux-send/insert pseudo-plugin is now introduced, allowing to route any track audio output to any other audio output bus besides the nominal one -- thanks to an original implementation from Holger Dehnhardt. - New immediate edit/loop-range settings from current clip extents, accessible on the main menu (Clip/Range Set, Loop Set) and from MIDI clip editor menu as well (File/Range Set, Loop Set). - MIDI Names XML files (*.midnam) may now be imported into MIDI instrument definitions. (EXPERIMENTAL) - Avoid cursor reset while editing MIDI events list (fixes bug #3380259, reported by Frank Neumann). - Just some typos fixing (patch #3378382 by c-korn). - Track view automation curve editing mode has been slightly fixed, now allowing for other previously existing point-and-click mouse operations. - Default automation curve mode is now preserved (following a suggestion by Alexandre Prokoudine, thanks). Enjoy! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

12 years, 6 months

[OT] Program now online - International Conference on Spatial Audio, Nov 10-13 2011, in Detmold, Germany

by Jörn Nettingsmeier

Hi *! The timetable for the International Conference on Spatial Audio 2011 in Detmold/Germany is now online: http://www.icsa2011.org/vdt/webdownloads/icsa2011/ICSA_Program_Schedule_201… The conference emphasizes the scientific and technical aspects of spatial audio, but a number of workshops and presentations will be devoted to the artistic and esthetic possibilities and challenges as well. In addition to five structured sessions on various spatial audio topics, the conference will feature installations of WFS + Height, Auro-3D, Binaural and Higher-order Ambisonic systems. During a three-day recording session last week totalling more than 140 microphone signals, we have recorded several chamber music ensembles simultaneously for all those methods and will offer conference participants a first-hand opportunity for comparison. Complementing the two fixed WFS installations available in Detmold, an additional temporary 40-speaker setup will be rigged for WFS and Higher-order Ambisonics reproduction, and one seminar room will be equipped for 9+2 channel Auro-3D playback. Registration is now open. Best regards, Jörn

12 years, 6 months

Internally representing pitch : A new approach

by harryhaaren＠gmail.com

Hey Everybody, I've been thinking about the "best" way to represent tonality & pitch in software. AFAIK most software implements thier "internal workings" as MIDI messages. This seems a clean easy solution, pass around 3 values and the whole Engine is sorted. But what if one wants to expand on the possibilities of MIDI, and not confine oneself to the 127 notes that are available, but rather allow the use of *any* tuning, pitch or scale. Scala seems pretty much designed to handle this kind of situation, and while I can read the example .scl files, I can't find any example "host" or simple example program to guide me along in how to use it... So that's the question here really, how does one go about it? -Harry

12 years, 6 months

jack session compatible applications?

by m.wolkstein＠gmx.de

hi, i am interested which jack supporting audio applications currently also support jack-session. http://trac.jackaudio.org/wiki/WalkThrough/User/jack_session holds a list, but i think it is a bit out dated. imo, it would be nice, if involved linix audio devs would add her jack-session application to this email. a really easy way to collect a list of this apps. i am involved in hydrogen so this is why i add only this application to this list. greetings and thx in davanced, wolke list of jack-session supporting applications: * hydrogen0.9.6 (svn head)

12 years, 6 months

calling zita-convolver users

by Fons Adriaensen

Hello all, A new release of zita-convolver is being prepared. It's currently in the 'torture department' for testing, and it will remain there for a week or so. There are quite a lot of changes. The new release will not only be binary incompatible with 2.0.0, there will be some small but unavoidable API changes as well. This also means there will be an update of jconvolver at the same time. If you are one of the brave using zita-convolver in your own project even if there was no documentation at all, please get in contact. I will then provide the new library along with instructions that should allow you to provide a compatible source version of your app at the same time as the library update. Ciao, -- FA

12 years, 6 months

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Linux-audio-dev October 2011