Linux-audio-dev

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7445 discussions

by Jens M Andreasen

What is the rationale for jackd requiring buffers to have number of frames set to a power of 2? Could this be relaxed to perhaps a multiple of 16, 32 or somesuch? I have a few reasons for wanting to do so a) Neither 128 nor 64 matches a samplerate of 96K and 1ms between USB midi messages. 96 would. b) CUDA (Nvidias gpgpu language) appears to have some magic regarding 192 threads that seems to work most fluently. This also happens to be a multiple of 96 opening up for some programming efficiency advantages when threadID equals [a multiple of] frame index. c) Although certainly possible, 256 parallel "moog"-filters is a bit overdoing it, no? IMHO, once a multichannel polysynth goes beyond 96 voices (in this case with two filters - one left, one right - per voice == 192 threads) the experienced return of improved quality/complexity is diminishing steeply, getting lost in the mix. I'd much rather spend more clockcycles on, say post-processing of channels - or more room for a simultanious video stream.

15 years, 4 months

[ANN] Qsynth 0.3.4 released!

by Rui Nuno Capela

Howdy! Simple as it could be, Qsynth 0.3.4 released! Description: Qsynth is a fluidsynth GUI front-end application written in C++ around the Qt4 toolkit using Qt Designer. Eventually it may evolve into a softsynth management application allowing the user to control and manage a variety of command line softsynth but for the moment it wraps the excellent FluidSynth. FluidSynth is a command line software synthesiser based on the Soundfont specification. Website: http://qsynth.sourceforge.net Project page: http://sourceforge.net/projects/qsynth Download: http://downloads.sourceforge.net/qsynth/qsynth-0.3.4.tar.gz Weblog: http://www.rncbc.org License: Qsynth is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - Command line option parsing has been slightly refactored to allow custom override through extraordinary fluidsynth option settings (eg. -o name=value; fixes bug #2781579). - Main form layout has been given a little bit more slack space, just to accommodate some longer text label translations (eg. German). - Converted obsolete QMessageBox forms to standard buttons. - Saved channel presets are now effectively loaded on engine startup. - Russian translation added (thanks to Alexandre Prokoudine). - Grayed/disabled palette color group fix for dark color themes. - Qt Software logo update. - Fait-divers: desktop menu file touched to openSUSE conventions. - Slight optimizations to the output peak meters refresh rate. - MIDI and audio device names are now user selectable options through respective drop-down lists on each engine setup dialog. - New knob style: Skulpture. Cheers && Enjoy! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

15 years, 4 months

Tux Paint for music?

by David Olofson

(Also posted over at the SDL mailing list; <sdl(a)libsdl.org>.) Hi! My son is playing around with my little SDL based drum machine, DT-42 again. He seems to be having fun, but I suppose he'd be better off with something more straight-forward (DT-42 is more like a MOD tracker than a conventional drum machine), and something with more obvious ways of creating melodies... At least, that's what I'd like! :-D This brings up some thoughts I've been having for years now: A really simple, yet somewhat useful and educational music toy. An integrated synth/sampler/sequencer, possibly with audio recording facilities down the road... Sort of like a tracker (Amiga MOD style), but with a more visual GUI. Probably some sort of piano roll. A bunch of nice sounds (I'm thinking IFFT synthesis) with some pre-wired intuitive timre controls. Maybe a library of drum patterns... Preferably SDL based and portable to all sorts of computers and devices. In short: Tux Paint for music! :-) Is there something like this already out there? Any interest in this sort of stuff? Ideas? I'll probably use EEL for all high level code, over a C engine. EEL is probably not the most sensible choice for a Free/Open Source project, but I'm using EEL for various stuff myself (mostly work related), and it could use some more pilot projects to guide future development. URLs: Tux Paint: http://www.tuxpaint.org/ DT-42: http://olofson.net/mixed.html EEL: http://eel.olofson.net/ -- //David Olofson - Programmer, Composer, Open Source Advocate .------- http://olofson.net - Games, SDL examples -------. | http://zeespace.net - 2.5D rendering engine | | http://audiality.org - Music/audio engine | | http://eel.olofson.net - Real time scripting | '-- http://www.reologica.se - Rheology instrumentation --'

15 years, 4 months

Re: [LAD] linux audio and what have you ...

by Ivica Ico Bukvic

> Hey there, Ico! > > Were you in Parma last month for the Linux Audio conference? > As you may recall, I am the News and Announcements editor for CMJ. > If you have any good CMJ-type photos or a paragraph of news to report, I > would be happy to include them in the next issue. If you send photos, > please send them in the highest resolution possible with captions and > photo credits. All, If anyone has some cool photos/news from Parma (Dave?), this might be a good opportunity to get it published. Please contact Lonce Wyse with your materials at lonce.wyse(a)nus.edu.sg. Best wishes, Ico

15 years, 4 months

high speed USB audio device

by Tor Håkon Gjerde

Hello! I am trying to build a high speed usb audio hardware device that will work using existing audio class drivers. I can get it to play in synchronous mode but i really want to use adaptive synchronization which gives the following kernel error cannot submit syncpipe for urb 0, error -90: internal error I cant seem to figure out what i am doing wrong. Some hints would be of much value to me. -- thg

15 years, 5 months

alsa card order

by Fons Adriaensen

Hello all, I'm Running F10 and I have these lines in /etc/modprobe.conf: options snd cards_limit=4 alias snd-card-0 snd_intel8x0 alias snd-card-1 snd_mpu401 alias snd-card-2 snd_ice1712 options snd-card-0 index=0 options snd-card-1 index=1 options snd-card-2 index=2 but the order of the devices is always the inverse: ice1712, mpu401, intel8x0 What am I missing ? Ciao, -- FA Io lo dico sempre: l'Italia è troppo stretta e lunga.

15 years, 5 months

making 'whysynth' microtonal/tuning-table capable

by Aaron Johnson

Hi all, As a big fan of alternative tuning systems and microtonality, the desire naturally occurs to me to seek out synthesis tools which make this possible. I also happen to think 'whysynth' is a nice application whose general felxibilty and sound make it worthy of having some of the more microtonal-aware capabilities of for example, "ZynAddSubFX", but it seems that zyn is no longer in active development, and is sometimes oddly bug-ridden and unstable. So, after having located the code snippet in whysynth that creates a standard 12-equal tuning array, called 'y_pitch', as factors relative to 440HZ (A440), and indexed by MIDI note numbers. I wonder, how easy would it be to make this table dynamic and subject to for example, loading a SCALA .scl file, or at least, a user defined array which can be loaded from a dialog box? here's the code snippet from 'whysynth_voice_render.c' /* MIDI note to pitch */ for (i = 0; i <= 128; ++i) { pexp = (float)(i - 69) / 12.0f; y_pitch[i] = powf(2.0f, pexp); } My GTK experience is nil; my programming chops are strong in Python and TkInter, but not as strong in C/C++....perhaps someone who might be interested in such a venture could point me in the right direction, or be of some assistance? Best, -- Aaron Krister Johnson http://www.akjmusic.com http://www.untwelve.org

15 years, 5 months

LAC2009: Conference material (papers, photos and more) now online

by Frank Neumann

Hi, I finally got my ass up to prepare some pages about the Linux Audio Conference 2009 (LAC2009) in Parma with photos, conference material (PDFs) and "bonus material". Now available at the same link that was published here before - http://lad.linuxaudio.org/events/2009_cdm/ Enjoy, Frank PS: If you have made photos and written a report for the event and would like to have a link added to the URL above, let me know.

15 years, 5 months

[OT] gdm setup in F10

by Fons Adriaensen

Just installed Fedora 10. It comes with Gnome as the default desktop of course. Previous versions of gdm at least allowed me to select just WindowMaker, but the option has been removed, as well (AFAICS) gdmsetup. So will F10 allow me to use WindowMaker without having to hack some deep internals ? If not I'll just revert to F8. And if this trend continues I could as well forget about Linux and use Windows. Is there any Linux distro left that does not depend on all the *Kit crap ? Ciao, -- FA Io lo dico sempre: l'Italia è troppo stretta e lunga.

15 years, 5 months

LAC09: thanks

by IOhannes m zmoelnig

thanks to fons, frank, jörn and the rest of the team that made LAC09 possible. even though i could not attend the entire conf, i very much enjoyed the rest of it. c u in u fgamsdr IOhannes

15 years, 5 months

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Linux-audio-dev