Linux-audio-dev August 2006

linux-audio-dev@lists.linuxaudio.org

52 participants
31 discussions

[linux-audio-dev] plug:jack device channel-count

by carmen

> Yes, but what would be even more useful is to report this to the > sweep developers. done. as it turns out, theres a divide-by-zero on alsahandle->num_channels or similar. ive noticed other ALSA apps will also fail with plug:jack (notably Twinkle) with an error very similar (eg, no available channels for opening), while others such as Ekiga or those using GStreamer, have no problems with plug:jack. are these apps working around it by trying to open channels even if the number available is reported to be 0? maybe this is a bug in jack:plug for not making up a number like at least 2, if alsa_pcm devices exist in jack..

18 years, 5 months

[linux-audio-dev] Kokkini Zita

by Fons Adriaensen

(Since this was rejected on LAA ('no reason given'), I'll answer the question here.) On Mon, Aug 14, 2006 at 09:20:36PM +0400, Andrew Gaydenko wrote: > What do "Kokini Zita" words mean? I have thought, Fons Adriaensen is the author > of the listed apps :-) It should be "Kokkini" (with 2 k's in the middle) actually. It's indeed Greek and means 'red zita', where zita is the name in modern Greek for the character traditionally known as 'zeta'. So I'll be using a red zeta as a logo. There some word play involved as well. Zita is also a girl's name, and there exists a Flemish comic series in which a character called 'rode Zita' (red Zita) appears. She's the red-haired and voluptuous girlfriend of the hero - a sort of Robin Hood like character whose gang of outcasts is constantly pestering the French soldiers that occupied Flanders 200 years ago. -- FA Lascia la spina, cogli la rosa.

18 years, 5 months

[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, 5 months

[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, 5 months

[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, 5 months

[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, 5 months

[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, 5 months

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, 5 months

[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, 5 months

[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, 5 months

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Linux-audio-dev August 2006