Linux-audio-dev

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7513 discussions

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 --'

16 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

16 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

16 years, 4 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.

16 years, 4 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

16 years, 4 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.

16 years, 4 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.

16 years, 4 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

16 years, 4 months

LAC09 downloadable proceedings...

by IOhannes m zmoelnig

hi all, fons. thanks for putting the conference videos online. while i did purchase the proceedings in printed form, are they also available in some electronic form (e.g. pdfs)? this way, i would not have to carry around a kilo of paper...:-) fgmasdr IOhannes

16 years, 4 months

How is the TSC calibration accuracy on dual core 2 computers? (And what about HPET?)

by Kjetil S. Matheussen

I'm doing some benchmarking where I need about 0.1ms accuracy. I'm using an intel dual core 2 computer. This is for a paper, so I just need the numbers, and the code is not going to run on any other computer. I've looked at the HPET code in jack, but am unsure how accurate it is, and whether there are any overhead using it? And I have also tried using tsc[1]. tsc seems to work perfectly, but I don't know how accurate it is on intel dual core machines? Testing the accuracy of tsc by bounding my thread to one processor using sched_setaffinity and using usleep(), and comparing with code which is forced to switch to read the tsc value from the other CPU, shows that the accuracy of tsc when reading and writing using two different CPUs is below 1ms since that's the accuracy of usleep(). So it looks promising, but I need at least 0.1ms accuracy... Anyone know how much jitter there might be for tsc? I've not found anything on google yet. [1] __asm__ __volatile__("rdtsc" : "=A" (ret))

16 years, 4 months

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Linux-audio-dev