Linux-audio-dev

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7513 discussions

[linux-audio-dev] jack.el -- Run and monitor JACK from within Emacs

by Mario Lang

Hi. I am sure this sounds a bit crazy to some of you, but be ensured, I am not (yet) completely out of my mind and there are actually real reasons for doing what I do :-). I am now running jackd from within Emacs, using jack.el. Find it here: http://delysid.org/emacs/jack.el Basic usage: * Install the elisp file and put (require 'jack) in your .emacs. * Customize startup options: M-x customize-group RET jack RET * I.e. jack-sample-rate and jack-period-size are two important candidates. * Start jack: M-x jack-start You will see the verbose output in a special buffer called *JACK output*. * If you want/need to get rid of your jack instance, simply do M-x jack-kill RET * If you changed sample rate or any other startup parameter, do M-x jack-restart RET to make them effective. Plans: * Do something useful with xrun output, maybe some stats (suggestions?). * Add support for dummy and oss drivers, and add remaining ALSA params. * Write a patchbay based on jack_lsp and jack_{dis,}connect. Why am I doing this? You might have noticed I am recently seriously working on Emacs extensions related to Sound and audio. osc.el is working nicely and om.el, a client to drobillas om-synth is just waiting for a polish up. midi.el is parsing binary data already and needs a bit more careful planning before it can really grow. The idea behind jack.el was that I basically got fed up by jack wasting either a virtual console, or a screen window. Both dont really offer confortable scrollback, so the idea to make jack run from within Emacs, and collect all its output into a Emacs buffer was born. Some nice sideeffects: Load statistic is collected in a variable, so if you are into elisp, you can do fancy stuff like: (with-current-buffer (jack-output-buffer) jack-load) to retrieve the current load :-) Combine all this with things like csound-x (Csound support for Emacs) and the SuperCollider Emacs frontend, and you get a truly powerful composition and experimentation environment. One day I'll learn CLM and CM, and add it to the mix as well :-) -- CYa, Mario

20 years, 2 months

[linux-audio-dev] Linuxtag 2005

by Christoph Eckert

Hi all, Linuxtag[1] 2005 is over. It took place from 20050622 to 20050625 in Karlsruhe, Germany. We had a booth there populated by the following people: Arnold Krille Christoph Eckert Frank Neumann Gerd Flaig Joachim Schiele Moritz Dressler Reinhard Katzmann We had 4 presentation places with a keyboard and a notebook each, additionally an acoustic guitar and an electric violin so we have been able to show soft synths as well as realtime audio processing. Needless to say that there have been lots of USB audio devices :) . There was a lot of interest of the visitors in what we can do with free audio software, and my observation is that most people have been simply surprised by the amount of available applications as well as the quality of the apps and the processed audio material. Furthermore I had the occasion to hold two talks about linux audio, one for musicians[2] (en) and one for desktop users[3] (de). Because it has been a successful show with really great software, I'd like to thank all who helped and especially those who do the hard background work on free audio software. Best regards ce [1] http://www.linuxtag.org/typo3site/8.0.html?L=1 [2] http://www.linuxtag.org/typo3site/ freecongress-details.html?&L=0&talkid=145 [3] http://www.linuxtag.org/typo3site/ freecongress-details.html?&L=0&talkid=300

20 years, 2 months

[linux-audio-dev] What parts of Linux audio simply suck ?

by Dave Phillips

Greetings: The subject says it all. My own "Linux audio sucks" hobbyhorse: No way to recall a complex configuration of apps and plugins with all settings intact. If I use a complicated setup with multiple synths and plugins I have no way to recall these applications to their previous settings. LASH/LADCCA was supposed to address this situation but I don't know where that project stands at this point. And your favorite is... ? Best, dp

20 years, 2 months

[linux-audio-dev] La Marmite

by nico

Hi, I started last year the project of an small framework for audio apps based on JACK and LADSPA. I published it quite a while ago on : http://lamarmite.poivron.org But I'm now really doubting of the interest of this project and this should be THE place to find answers ... --*/--*/--*/--*/ Here is a short intro La Marmite is a C++ framework cooked for the development of audio applications for GNU/Linux which is based on the will of simplifying the combined use of the standard tools JACK and LADSPA. La Marmite is free software and published under the GNU Public License. JACK and LADSPA are two major ingredients from the Linux audio world but mixing them together often bury me in long hours of C coding which rapidly oxidize my placid humour... My idea was to construct a object-oriented environment providing a higher level of abstraction and which allows me to concentrate on the logic of the application and to achieve my goal faster without having neither to bury myself in the inmost depths of the interfaces nor to recode over and over the same routines. Do you feel like ? La Marmite was designed in order to create same applications, audio toys, or autonomous audio modules which be further mixed or combined through JACK. But only few things have been realised so far. And it might not be well suited for larger scale applications.

20 years, 2 months

[linux-audio-dev] jackd ubuntu oddities

by Ivica Ico Bukvic

Hi all, I am quite flabbergasted by this particular problem as it never was a problem before. Therefore, I would greatly appreciate any help I can get in this matter. I've installed Ubuntu Hoary and then installed realtime-lsm module from the Hoary deb repository. The realtime-lsm definitely works without a problem and has been thoroughly tested. If I install any audio jackd-capable app from Ubuntu Hoary deb repository, it works just fine with jackd (which was also installed from the repository) both real-time and non-realtime, except for the Supercollider. Jackd uses in /tmp folder which has been mounted as tmpfs to improve performance. I tried installing Supercollider from source and it exhibits the same behavior as the .deb. I did install Alsa 1.0.9 as 1.0.8 that ships with Ubuntu has some bugs in respect to hdsp driver (although Ubuntu may have patched these, haven't bothered to check). When trying to connect to non-rt jackd, Supercollider works, but when connecting to real-time enabled jackd it connects and immediately gets disconnected reporting error that it has been "zombified" by jackd. I tried even enabling realtime-lsm for all apps and that did not help. Starting jackd in softmode does not help. Now, I know that it worked just fine on Mandrake with realtime-lsm module so I have no idea why jackd is being so picky. Considering all the problems, I tried installing jackd from source (Hoary has 0.99.0, so I downloaded the same) and now here is where the rub starts. Once I install the same version jackd from source, no app from Hoary's .deb repository works any more with it, including qjackctl. Error reported is "could not tie an input port" or something along those lines. So, the only thing I can do is then install all the audio apps from source to make them work with the jackd. So here are my questions which I would greatly appreciate your help in answering: 1. Why is this happening when both the .deb and source versions of jackd are the same? 2. So what can I do at this point and why some apps (pd sometimes also gets zombified) get so easily kicked from jackd while others don't? 3. Is there anything I can do to retain compatibility with the jackd-enabled apps from .deb repository when compiling newer version of jack from the source? 4. What actual version of jackd is Ubuntu using? How is it altered? 5. What can I do to make jackd tolerate initial start-up delays (ironically this has not been the problem in the past with supercollider, so at this point I am not sure whether it is a problem with supercollider, jackd, or Ubuntu)? 6. Should recompiling kernel with low-lat and realtime patches (i.e. ck) help solve some of these problems? 7. Any other advice that may help solve these problems would be most appreciated! Sorry for cross-posting, I am hoping that Ubuntu devs/users may be able to answer some of these. Many thanks! Best wishes, Ivica Ico Bukvic, composer & multimedia sculptor http://meowing.ccm.uc.edu/~ico/

20 years, 2 months

Re: [linux-audio-dev] [ot] [rant] gcc, you let me down one time toomany

by Michael.Gogins＠sungard.com

I did test it, and it was just as fast either way (g++ 3.3/MSVC++ 7.0 on Windows 2000 a year or so ago). Regards, MIke

20 years, 2 months

[linux-audio-dev] Author on LADSPA/DSSI wanted

by Oliver Frommel

Hello altogether, the German language Linux-Magazin is going to produce an issue on audio. Therefore we are looking for someone who is willing and able to write on LADSPA and/or DSSI, possibly focusing on just one of both technologies. If you are interested please contact me. Thanks Oliver -- Linux New Media AG Süskindstraße 4 D-81929 München Tel: +49 (89) 99 34 11 42 Fax: +49 (89) 99 34 11 99

20 years, 2 months

[linux-audio-dev] Proposed scary kernel change for 2.6.13

by Lee Revell

Andrew Morton and others want to change the default value of HZ to ~250 for kernel 2.6.13, "to save power on laptops". I think this is absolutely insane, I should not even have to explain why. If you feel the same way, *please* complain about it on LKML. The thread is called "-mm -> 2.6.13 merge status". They at least need to merge the high-res timers patch at the same time, so that users will not see a regression in the sleep() resolution from 1ms to 3ms. Lee

20 years, 2 months

[linux-audio-dev] more on damaging signals

by Dave Griffiths

Hi all, I posted some questions a while back about signals that could potentially damage PA speakers, or equipment after amplification. I'm starting to look at using a genetic programming synthesiser I'm writing for live performance: http://www.pawfal.org/index.php?page=WigWamJam This synthesiser can create arbitary functions for rendering samples, these functions are then randomly mutated and guided by the user by aesthetic choice. As you can imagine, during this process rather nasty sounds can be generated (this may not prove to be a useable system for live use without people getting annoyed and throwing things at me, but, erm, bear with me here :) Other than user driven selection based on the audible results, some automatic removal of functions is going to have to happen. From people's feedback on LAD these would include rendered sounds that have the following features: * high dc offset * very low frequency * very high frequency I'd like to avoid filtering the sounds as a post process ideally, but I guess some enveloping would be needed to prevent sudden jumps in dc at the beginning and end of the samples. I'd also automatically remove functions that result in silent samples. Any thoughts? cheers, dave www.pawfal.org/nebogeo

20 years, 2 months

[linux-audio-dev] Pro?

by Jens M Andreasen

Hi! There has been some discussion lately involving keywords such as "amateuer" and "professional". An "amateur" works for the love of it (as in 'amore'.) A "professional" works to earn his/her daily bread (as in 'proffezione'.) Those two concepts are not mutuallally exclusive per se. It is not unsual though, for "pros" to get fed up with their chosen line and still do their thing for the love of money, or lack of alternatives. Whatever .. We also have touched the words 'consumer' as well as 'producer'. Playing an mp3 (or ogg?) is a typical consumer behaviour. Creating an mp3 (or ogg) from scratch as in you, recording your grandma singing "Happy Billday", is a production. So?! When we say 'pro', it would make much more sense if we could agree on that this means "produzione" rather than "profezionale". Mvh // Jens M Andreasen (My appologies to Benno for the mindless ad hoc Italian/Latin lingo.) --

20 years, 2 months

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Linux-audio-dev