Linux-audio-dev

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4 participants
7441 discussions

[linux-audio-dev] Linux kernel HZ, audio latency and how to measure?

by Mulyadi Santosa

Hello everyone.... I am kinda interested to study the effect of changing kernel HZ (internal timer frequency) and the audio processing. Since I am a newbie in Linux Audio, I will be glad to receive any comments, especially the constructive ones. Is there any relationship between kernel HZ and audio timing? I imagine that something like audio recording from a Hi Fi will get a benefit from a finer granularity timer frequency, since it can achieve 1ms (or even smaller) resolution. But, if there is relationship between those two, then how to measure it? Do I need to check every delay function and record the requested delay vs the actual delay? Or is there other method? I already searched the archieve looking for the similar question, but I found none. Thank you in advance your help and attention. regards, Mulyadi

18 years, 1 month

[linux-audio-dev] [ANN] Csound 5.1.00.0 beta1 ("alternative" version) release

by Istvan Varga

Source and binary packages, and documentation can be downloaded from here: http://sourceforge.net/project/showfiles.php?group_id=167991 Change log and release notes are attached. You can subscribe to the new mailing lists created for this project at these pages: http://lists.sourceforge.net/mailman/listinfo/csound5-devel http://lists.sourceforge.net/mailman/listinfo/csound5-user

18 years, 1 month

[linux-audio-dev] JACK MIDI <-> ALSA Sequencer link?

by David Olofson

Is there such a thing? (Could be implemented as a JACK + ALSA sequencer client, I suppose.) Or is there some other way of wiring JACK MIDI ports to ALSA sequencer ports and/or vice versa? //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 --'

18 years, 1 month

[linux-audio-dev] all your face are belong to audicle (source released!)

by Ge Wang

Hi! The Audicle source code is finally released (GPL). Now audicle can be built to run and crash on Linux systems in addition to Windows and OS X. http://audicle.cs.princeton.edu/ Additionally, there is now formal documentation for the Audicle: http://audicle.cs.princeton.edu/doc/ http://audicle.cs.princeton.edu/doc/faces/ Also, there is now a miniAudicle for linux: http://audicle.cs.princeton.edu/mini/ The command line ChucK and friends (most stable and full-featured option for linux currently): http://chuck.cs.princeton.edu/ http://chuck.cs.princeton.edu/doc/ http://chuck.cs.princeton.edu/community/ Since this is the first source release and effectively the first release for Linux, there is probably plenty of bad voodoo lurking in the build and beyond. Please let us know if you run into anything fishy or outright wrong. Feedback is most appreciated, and feel free to call us idiots. Finally, major thanks to Graham Coleman, Shawn Shaknitz, Scot Gresham- Lancaster, Gary Scavone, and the wonderful people of PLOrk (http:// plork.cs.princeton.edu/people.html). Thanks! Happy ChucKing. Best, audicle team (Perry, Phil, Ananya, Spencer, Scott, Ge, etc...)

18 years, 1 month

[linux-audio-dev] Which sequencer framework for a simple MIDI drum looper ?

by _ langagemachine

Hello. I write hoping that some nice LADs might enlighten me ? I've been feeling a recent itch to write a simple step-sequencer, which outputs MIDI messages to the ALSA seq ; it is intended to drive a drum machine. My ideal app is provided with a graphical UI which includes HUGE buttons (to give you an idea, the GUI in FL Studio comes to mind). It may seem silly at this point, but I could not find an existing app which exactly suits me. But anyway, I think it will be a piece of fun trying to write something myself... I shamefully admit being no good at C/C++ programming, but I could write some GUI code in Python/Java, which would communicate with the sequencer engine, over OSC for example. Regarding said sequencing engine, I have found 3 possibilities so far : - Chuck http://chuck.cs.princeton.edu/ - Midishare (can be driven in Java, Lisp, ...) *provided that I can get it to compile on my Gentoo box ... http://midishare.sourceforge.net/ - Milk (Python MIDI engine for ALSA) http://www.quitte.de/milk.html: The former two seem slightly more complete ; in particular, I very much liked Breakage, which uses Chuck : http://www.blackholeprojector.com/ (Actually, this app would have been a very good fit, but it is Windows/Mac only :-o) I'll finally make my point : which framework would - in your experience - be the most practical to use ? Or the most interesting to learn ? Many thanks for your attention. NB : I am aware that Hydrogen is one fine app ;-), and probably a step sequencer can be written as a Pd patch in seconds, but that is not what I am after at the moment ; I insist on the user interacting with big, Playschool-like BLOCKS :-)

18 years, 1 month

Re: [linux-audio-dev] Which sequencer framework for a simple MIDI drum looper ?

by _ langagemachine

Yes, a lot of research has obviously been put into this library ; the fact that it has plenty of language bindings (java, lisp, python) is attractive also. Plus, the JMusic project provides classes for manipulating musical data, and an interface to Midishare... I will make some tries at it on a CCRMA box, I think. Thanks for your feedback :-) On a more general keynote, is it not paradoxical that when a piece of software becomes mature enough, it tends to fade out of the general attention ? 2006/8/15, Jay Vaughan <jayv(a)synth.net>: > I work with MidiShare quite a bit, and I have to say that if you get > it going on your system, it really is one of the nicest, > best-performing MIDI API's around .. of course the fact that it comes > with a Sequencer lib that supports up to 256 tracks is a bonus too .. > ;) > > That said, it may not be quite "ALSA mainstream" enough of an API to > warrant usage, but if you have control over your system and get > MidiShare.o built and in use, you've got a damn fine MIDI API, > oft-overlooked .. > > -- > > ; > > Jay Vaughan > >

18 years, 1 month

[linux-audio-dev] scaling jackinput to dbSPL

by conrad berhörster

Hello all, Does anybody know, how i can scale the incoming jack signals to dbSPL, which is in the range of 0 to 120. An is it possible to calculate from dbFS (which is used in normal soundapp in range -inf to 12db) into dbSPL. thanks c~

18 years, 1 month

[linux-audio-dev] 2.6.15.7-rt

by Joshua Boyd

I just upgraded my LFS 6.1 system from 2.6.12 (with preempt, but not the -rt patch) to 2.6.15-rt (enabling high resolution timers and PREEMPT_RT along the way), and now my audio driver is dropping interrupts every few seconds, something it wasn't doing before. I haven't configured rtlimits since the program runs as root anyway, and I'd like it to be free to hog quite a lot if need be. In my application (which runs in SCHED_FIFO), the audio thread runs at -10, while the video thread runs at -19. I don't know if that is best, I just wanted them to be higher than the other threads. Also, outside forces, like a ssh connection, or a USB dongle connection cause the program to drop audio madly. Is there some code I need to be adding to force such system tasks down rather than just elevating my own application? -- Joshua D. Boyd jdboyd(a)jdboyd.net http://www.jdboyd.net/ http://www.joshuaboyd.org/

18 years, 1 month

Re: Re: [linux-audio-dev] LV2 and Linuxaudio.org

by t_w_＠freenet.de

Gesendet: Mo 14 Aug 2006 15:38:29 CEST Von: "Steve Harris"<S.W.Harris(a)ecs.soton.ac.uk> > FWIW, I think it would be a good idea. However, it's not clear that there > exists an LV2 "thing" to be a member of anything. I'm only responsible for the website and logo but also think it's a good idea. At least I don't see how it could hurt ;) > Perhaps the LV2 specifcation site (http://lv2plug.in/) could be a member? > If there was a consensus that it was a good idea, I'd be happy to state > that. Or something. > > Also, there could actually be a LV2 project, mailing list etc. created, > theres a DAV repository at lv2plug.in, and people hack on the contents, so > it does kinda make sense. Sounds good. I would like to nominate Steve Harris as representative :) -- Thorsten Wilms

18 years, 1 month

[linux-audio-dev] LV2 and Linuxaudio.org

by Ivica Ico Bukvic

To all involved in the LV2 project, I would greatly appreciate your feedback regarding LV2 project becoming a member of Linuxaudio.org. Provided that you decide this is a step they wish to take, it would be a good idea to nominate someone as the representative of the project within the consortium. Please advise. Best wishes, Ivica Ico Bukvic, D.M.A. Linuxaudio.org Director Virginia Tech Department of Music - 0240 Blacksburg, VA 24061 (540) 231-7047 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/people/faculty/bukvic

18 years, 1 month

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Linux-audio-dev