Linux-audio-user March 2010

linux-audio-user@lists.linuxaudio.org

132 participants
139 discussions

Re: [LAU] [Jack-Devel] session management API proposal, take 3 (fwd)

by Gabriel M. Beddingfield

All: Based on some of the recent discussions on LAD and LAU, I thought it prudent to forward this message from the Jack-Devel list. If you wish to continue the discussion on the the Jack session management API, please do it on the Jack-Devel list. Scroll down to the very bottom for a URL to the list. -gabriel ---------- Forwarded message ---------- Date: Thu, 4 Mar 2010 18:16:39 -0500 From: Paul Davis <paul(a)linuxaudiosystems.com> To: jack-devel(a)lists.jackaudio.org Subject: Re: [Jack-Devel] session management API proposal, take 3 [ ... chatter chatter chatter ... ] i'm on the verge of approving the API proposed by Torben for inclusion as part of the JACK API. I believe that it accomplishes the goal of leveraging an existing IPC channel (via libjack), combined with a minimalistic set of changes to the server and easy-to-implement support in clients, to provide the basis for session management at different levels of sophistication, depending on a user's needs. Torben's example showed the generation of a shell script that will restart the session, and this is probably the "bottom line" in terms of simple session management. There are still some details (below) but more importantly, I would like to hear from people who have concrete objections, particularly of the following form: * the proposal does not address some functionality that it should address * the proposal will make later, more extensive session management harder, more complex or impossible * the proposal is nonsensical because ... As for details... I agree with the suggestion that the initial set of session events should include "quit". Nedko has also raised some objections to the use of a UUID, and has proposed a scheme based on PIDs. I personally do not understand how this can possibly work if JACK is to retain the ability to support multiple clients per process. Any scheme designed to use PIDs but still allow this seems to me to have to turn the PID into a UUID by combining it with some other information (eg. a client name). This doesn't seem to be semantically different from starting with a declaration that we use UUIDs to identify clients - how the UUIDs are constructed is an implementation detail. Finally, the semantics of the return codes from a session event need to be pinned down better, since there are circumstances where a client could *not* save its state without that being an error (e.g. ardour running with a session on read-only media). For this, I currently propose: success == client believes that it will be able to restore its state to the current state upon a reload fail = client believes that it will not (or may not) be able to restore its state to the current state upon a reload similar semantics will be needed for each other defined session event. _______________________________________________ Jack-Devel mailing list Jack-Devel(a)lists.jackaudio.org http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org

14 years, 9 months

changing for editing /etc/security/limits.conf in debian testing (ubuntu lucid)

by rosea grammostola

Hi, As I heard from the Debian jackd maintainer: In Debian testing/ squeeze and very likely in Ubuntu lucid, it's not neccesary anymore to manual edit /etc/security/limits.conf! It's been automatically done by jackd in /etc/security/limits.d/audio.conf and it will conflict with /etc/security/limits.conf. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=507248 Such things are good to know if you're member of the LAU community, and I feel communication is lacking often with these kind of things... \r

14 years, 9 months

Audio app which supports RT Jack Transport bpm changes

by rosea grammostola

Hi, Is there an audio app which supports Jack Transport bpm changes in realtime? I know some midi apps like hydrogen and non-sequencer, but not audio apps which can play and/or record audio. Regards, \r

14 years, 9 months

Re: [LAU] [LAD] Integrate LASH into Jack

by Gerald Mwangi

Ah cool, is it already in the current jack release? Too lazy to look. Gerald On Fri, 2010-03-05 at 12:06 +0100, torbenh wrote: > On Fri, Mar 05, 2010 at 11:48:11AM +0100, Gerald Mwangi wrote: > > Hi, this is a part of a previous mail,but with catchier Subject > > > > I think LASH should be integrated into Jack, to make it mandatory for > > linux audio apps. The missing LASH support is one of the main issues > > disturbing me, when working with linux audio. Now I've said it, ha. > > I'm thinking of having Jack require a Load/Save callback, prior to > > activating the client. How feasible is that? > > What do you think? > > Gerald > > i think this: > http://hochstrom.endofinternet.org/cgit/jack.git/tree/jack/session.h?h=jack… > >

14 years, 9 months

Re: [LAU] which audio synthesis environment?

by cunnilinux himself

>> But actually you guys lost me a bit, what is so important about the plugin paradigma? if you have quite a lot plugins with good presets, you actually don't have to learn anything. just try this and try that, and you've done. -- sex, bike, open source!

14 years, 9 months

Integrate LASH into Jack

by Gerald Mwangi

Hi, this is a part of a previous mail,but with catchier Subject I think LASH should be integrated into Jack, to make it mandatory for linux audio apps. The missing LASH support is one of the main issues disturbing me, when working with linux audio. Now I've said it, ha. I'm thinking of having Jack require a Load/Save callback, prior to activating the client. How feasible is that? What do you think? Gerald

14 years, 9 months

bare minimum session handling

by Renato

Hello, from users' perspective, what are currently the options for minimum session handling? I'd just like for a starter to have multiple sets of connections and be able to save and load them. Is there any documentation on at least one way of doing this? Couldn't find any Is patchage capable of doing this? What exactly does the "save positions" menu entry do? In second order, what may we expect from the near future in terms of more advanced session handling (lash, ladi)? Are they (lash/ladi) currently usable and used? (Certainly they lack documentation) Renato

14 years, 9 months

Convolution in LinuxSampler

by Julien Claassen

Hello! sorry for crossposting, but I didn't know, where to best reach the LS-wizards. I wondered about convolution in LinuxSampler. The GS3 format certainly supports in-sampler convolving (having their own files for that). I seem to rememb3er, that working out the format was not the real issue, but the implementation itself. But there I think Fons offered his convolution classes - as used in jconv - to easily implement it. As I now have more and more nice sounds, including even more handsome IRs (either rooms or body IRs) I was wondering, if the convolution issue is still persued. I certainly would very much appreciate it! So could someone please give me an update of the way LS is going? Warm regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

14 years, 9 months

Re: [LAU] crazy idea

by frank pirrone

Wouldn't a simple LED/photodetector pair attached to a simple bracket that would straddle the crank gear teeth generate a very useful, and high-resolution, train of pulses? I constructed a wooden ramp with sides containing two such pair to conduct basic acceleration experiments in a high-school physics lab. It was easy to write programs to perform the detection and timing counts. In fact, those pulses alone would drive a speaker/headphones in an interesting sounding manner much like that aforementioned trading card in the spokes arrangement. You could power the LED by battery or the bike's generator, and options for a circuit to process the pulse stream could be both simple and richly functional. Frank

14 years, 9 months

Two (free) albums (free) tracks available on archive.org

by Aurelien

Hello, (pre-prost-scriptum: improtant informations are quite below!!!) I think I didn't any announcement here before, but the label I created some years ago, and work in by now, released two albums fully realized with free softwares (on a Debian GNU/Linux distribution) in 2008: Sebkha-Chott - Nigla[h] / Tapisseries Fines en XXX Strips et LXX/X Trompettes Sebkha-Chott - De la Persistance de la Mythologie Chottienne en ??? Vélos Both those albums are distributed internationally by the label Muséa Records, and you may find them, freely downloadable and/or to purchase here: www.ammd.net/productions/productions.php and at a lot of other places on the web. You also might find numerous review of those albums, in Google, and so on. OK, that's it for the presentation. Actually, it took us a lot of time, but we finally sent the whole tracks of the 14 multitracks session (in ardour) and the session them selves on archive.org, so that you can use them freely. it's quite big big big sessions, as Sebkha-Chott used to be 8 people at that time and invited something like 25-30 guests to play with. So you might find something like 100-150 (even 180 on one of them, if I remember well) tracks by song. For Nigla[h], there are two options: we did tarball of each ardour sessions directory and we also bounced every tracks in one file, so that you can manage to use them in another multitrack editor. We then thought about it, and had the conclusion that it was a really hard work for us to do all these bounces and exports, and finally it essentially was destined to people using proprietary softwares. So, for De la Persistance, you will only find the tarballs, as we think we have to "encourage" people using ardour, or, if they prefer ecasound or whatever, they probably will be skilled enough to convert the xml file into something suitable for another soft, or a bit worse, they always might do all that export stuff and so on. The archive.org links are listed on www.ammd.net/productions/productions.php Hope you will enjoy it. All our further productions will follow the very same line (there will be one recording session in November for a pop-prog-rock band), and we also aim to release some very huge instruments sample base, as we have the luck to possess a very good studio, and also very good instrument, including, for example, a true Harpsichord, as one of us do build Harpsichords! See you. Aurélien - AMMD www.ammd.net PS: For off-list further informations, please write to orlATammmmmmmd.net, which is my pro mail, which I don't want to subscribe on this list (and ammd does spell with two 'm' only! ;) -- Aurélien

14 years, 9 months

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Linux-audio-user March 2010