Linux-audio-dev April 2009

linux-audio-dev@lists.linuxaudio.org

63 participants
44 discussions

by Sebastian Moors

Hi, i would like to know if somebody has already thought about a (unified) way to save or export the settings of ladspa plugins (or vst,lv2..) I'm familiar with the idea of LASH, but i want to share plugin settings between different sessions. A typical use case: After recording songs with my drumset, the gate-plugin applied to basedrum and snare has most times (nearly) the same setting. At the moment this is a quite painful task: Ardour is able to save the settings, but you can't export these or exchange them between other applications. In addition, ardour's ladspa plugin dialog can just save the settings, changing an already saved settings is not possible. This results in a heap of saved settings and old revisions.. It would be great to export these settings, it could be implemented as a feature in applications like ardour2 ,jackrack or hydrogen. After exporting the setting to a plain text file (or xml), sharing the file with other people or between your computer would be no problem. What are your thoughts on this? What are the disadvantages? Thanks, Sebastian

15 years, 2 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, 7 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, 7 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, 7 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, 7 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, 7 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

15 years, 7 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))

15 years, 7 months

viewing lac videos

by Fons Adriaensen

Hello all, I'm having some problems viewing the LAC videos. Totem (launched by Firefox) produces perfect image but no sound (this may be related to my previous post about alsa card order). Downloading the file and trying mplayer (compiled today) I get video: no video and no sound either. All this on a fresh F10 install wich probably needs some more tuning/pruning. Ciao, -- FA Io lo dico sempre: l'Italia è troppo stretta e lunga.

15 years, 7 months

making 'whysynth' microtonal/tuning-table capable

by Aaron Johnson

Porl, linux-audio people A SCALA scale library interface would be a fantastic idea....I did something like this as an exercise in Python for turning SCALA .scl files into tuning dump commands for fluidsynth (even though SCALA itself has fluidsynth scale output :) ) One could use regex statements to parse the header, and have some case switches to determine if the line in the scale 'body' of the .scl file was a ratio, or value in cents, etc. The synth engine would work with the final array of frequencies that were spit out into a MIDI-key indexed array.... I think this would be the easier part. The harder part, and where I think I'd need help, is integrating such functions into an existing audio architecture, plus integrating new GUI dialogs and menus into the same...it might take a whole to figure out if other things get broken as a result...I'm thinking for instance of envelope scaling being related to absolute pitch in HZ instead of MIDI note numbers. I haven't dug deep enough into the 'whysynth' code to see, but such things might need to be redesigned, and it might take time to work out any side effects of shoving SCALA interface code into the mix....maybe if Sean Bolton is on the list here, he'd have some insight into how to best fit things in with his existing code.... Perhaps the SCALA interface library could have a modular template of GUI dialogs/controls/menus for the more popular libs like GTK, FLTK, KDE, TK, etc.? Anyway, I'd be happy as a pig in %^&* to see this in whysynth, and as a de facto standard library the same way jack is in any synth application now written. Best, AKJ http://www.akjmusic.com #my site (lots of music made with linux there!) http://www.untwelve.org #my project (microtonal/tuning-centric concert series ;) ) On Tue, Apr 28, 2009 at 5:25 AM, porl sheean <porl42(a)gmail.com> wrote: > perhaps someone could write a simple library that takes a midi-key (0-127) > as input, as well as a 'scala' mapping and outputs frequency numbers? rather > than every project reimplementing the same idea. > > having written this, you all probably think it is obvious anyway, so i'll > keep quiet :) > > porl > > 2009/4/28 Dave Phillips <dlphillips(a)woh.rr.com> > > Aaron Johnson wrote: >> > ... 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? >> >> I'd like to second Aaron's proposal/request. Support for Scala files >> should be standard in all software synthesizers. It seems a bit >> ludicrous to fix intonation at 12-tone ET when the medium is capable of >> any intonation desired. >> >> Best, >> >> dp >> >> _______________________________________________ >> Linux-audio-dev mailing list >> Linux-audio-dev(a)lists.linuxaudio.org >> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev >> > > > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev(a)lists.linuxaudio.org > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev > > -- Aaron Krister Johnson http://www.akjmusic.com http://www.untwelve.org -- Aaron Krister Johnson http://www.akjmusic.com http://www.untwelve.org

15 years, 7 months

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Linux-audio-dev April 2009