Linux-audio-dev December 2005

linux-audio-dev@lists.linuxaudio.org

61 participants
53 discussions

[linux-audio-dev] non graphical vu meter

by ARRON STOCHLIA

I am trying to write an application that will monitor volume level coming in through the line-in jack on my soundcard. Is this possible using alsa, and if so, does anyone know of any examples, or am I in the wrong place? _________________________________________________________________ Dont just search. Find. Check out the new MSN Search! http://search.msn.click-url.com/go/onm00200636ave/direct/01/

18 years, 9 months

[linux-audio-dev] VST + Linux tutorial final update

by Dave Phillips

Greetings: Last month I updated the VST/Linux tutorial at http://www.djcj.org/LAU/quicktoots/toots/vst-plugins/. Due to circumstances, the updated page has only recently gone on-line, but no further material needed to be added. Please note that this update is the last that will be done for that tutorial. As you can read on the updated page, I now feel that the FST and DSSI projects are the currently preferred solutions for using VST/VSTi plugins under Linux. Both systems are easy to build and use, so I'll leave further explication to the developers of those projects. I suppose at some point someone should add some material regarding the use of VST plugins with Ardour, but it should really go on the Ardour wiki (or maybe it is already there?). Thanks to Patrick Shirkey for hosting this tutorial on his djcj site. Best regards, dp

18 years, 9 months

Re: [linux-audio-dev] [ANN] DRC: Digital Room Correction 2.6.2

by Ben Loftis

If you haven't tried out Denis' DRC program, you should. I have had great success with it. I am in the process of documenting my results ... watch this space. -Ben Loftis http://www.harrisonaudio.com http://www.studiooutfitters.com

18 years, 9 months

[linux-audio-dev] defining a platform

by derek holzer

Hi all, I hope this is a simple question. I'm trying to compile Rezound on OSX, and I'm getting this: ../../../config/platform/platform.h:10:3: warning: #warning no platform determined! Which leads to some other troubles later on. So I've created a config/platform/darwin.h file (based on the bsd.h file) which starts like this: #ifndef __rez_platform_darwin_H__ #define __rez_platform_darwin_H__ #if defined(__Darwin) #define rez_OS_DARWIN #endif And added OS_DARWIN to the platform.h file: #ifndef __platform_H__ #define __platform_H__ #include "linux.h" #include "solaris.h" #include "bsd.h" #include "darwin.h" #if !defined(rez_OS_DARWIN) && !defined(rez_OS_LINUX) && !defined(rez_OS_SOLARIS) && !defined(rez_OS_BSD) #warning no platform determined! #endif #endif But I still get the error. In the darwin.h file, I have tried various different syntax for defining Darwin: (__darwin), (darwin), __Darwin__), etc etc With no result. Can anybody shed some light on the right way to define the platform in this situation? thx + happy new year, derek -- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 81: "Go to an extreme, move back to a more comfortable place"

18 years, 9 months

[linux-audio-dev] db gain controls.

by James Courtier-Dutton

Hi, I have a question for some audio professionals out there. What is the smallest sensible gain control step in dB. Is it 0.5dB ? I am asking, because if one is using a digital gain control in a 24bit fixed point DSP, once could use almost any step size, so I am looking for the smallest sensible size to use. Some people mentioned earlier on a previous thread that there was something called soft gain control, where the user moves the gain up a step, but the mixer gradually(fairly quickly) adjusts the volume to the new level, so no clicks are heard on the speakers. How does these soft gain controls prevent the clicking? Do they wait for the zero crossing point to adjust the gain? James

18 years, 9 months

[linux-audio-dev] Re: [SoX-users] Trimming silence

by David Kastrup

tom christie <christie.tom(a)gmail.com> writes: > I've written a little template program that just reads from one > audio file and writes to another, using the sox library stlib.a. > It's pretty simple to change it to do what you want. Thanks, I'll give it a whirl. I still think that the code of the sox executable should be able to trim just zeros at least at the start of the file, and that the docs are hard to understand and missing stuff, but there is nothing except list the complaints that I feel capable of doing. I strongly suspect that the code does something different from what it is supposed to do, but I find it impossible to figure out what it is supposed to do, either. So I might be wrong about that. -- David Kastrup, Kriemhildstr. 15, 44793 Bochum

18 years, 9 months

[linux-audio-dev] Reminder: LAC2006 Call For Papers/Music/Demos

by Frank Neumann

Hi list(s), just a short reminder: The Call for Papers, Call for Music etc. for the 4th International Linux Audio Conference (LAC2006) is still running until January 8th, 2006. That means for those of you who drive home for Christmas like me - use the time wisely :-). Write a paper, compose a piece, think of a software demo - and submit your entry in time. See all the details at: http://lac.zkm.de Hoping to hear from you (and then see you) soon, Goetz Dipper & Frank Neumann LAC2006 Organization

18 years, 10 months

[linux-audio-dev] High-order Ambisonic coder/decoder in JACK/LDASPA?

by Asbjørn Sæbø

Some colleauges of mine do need a tool for coding and decoding of high-order Ambisonic for their research. They are aiming for seventh order, played back over sixteen loudspeakers. They are now planning to implement this, using either JACK or LADSPA. As I have some experience with linux audio, I got involved. So I am seeking some advice and answers here. The first thing I would like to know is: Does anything like this already exist? (I think there are some LDASPA plugins for Ambisonic, but I am not aware of how high order these are.) Secondly, what would be the better choice, JACK or LADSPA? We are probably going to need som GUI on it, to configure the thing. And we would like to have the flexibility to alter the coding/decoding coefficients, turn on/off some filtering and so on. With kind regards Asbjørn

18 years, 10 months

[linux-audio-dev] Notation editors

by Aaron

Hi all, I started out wondering who uses Denemo, for notation editing, but my idea quickly evolved to this. I would like to know who on the list uses graphical notation editors, which one?, what are in your eyes the advantage of your particular editor, the disadvantages? I realize that there may be people using Sibelius/Finale, which aren't linux programs, but I was running Finale for quite a while on wine/win4lin for quite a while because of legacy issues. Also how many people use non graphical music notation. Mup, LilyPond, Guido, abc, common music notation etc. Why? What is the advantage them, disadvantage. This will help Denemo see what linux musicians/developers use and hopefully help us see what we can do to make Denemo more useful. Thanks Aaron

18 years, 10 months

Re: [linux-audio-dev] Implementing synthesizer????

by Kjetil S. Matheussen

Paul Davis: On Fri, 2005-12-16 at 12:15 +0900, chandrasheakhar singh wrote: >> Dear All, >> >> After successful implementation of player + synthesizer as a loadable >kernel module in linux 2.6.11 >> for OMAP >> 2420. My next mission is to implement synth and sequencer seperately >in linux kernel 2.6.11. >> >> I dont have much idea of VIRMIDI implementation and how i have to add >my synth as default kernel >> synth, though >> GPL issue is still not very clear as we will open our source code for >public or not. >> >> Can any one pass me some good link which describe how to implement >synth as VIRMIDI and sequncer >> separately in linux 2.6.11. > > are you out of your mind? partly kidding, partly serious. > He he. :-) I like that kind of thinking though. And what would be even cooler would be something like a graphical web-browser or an e-mail reader implemented as a kernel module. ;-) --

18 years, 10 months

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Linux-audio-dev December 2005