Linux-audio-dev June 2011

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Faust MIDI?

by Carlo Capocasa

Hi, is it possible to send and receive MIDI with a FAUST program? Carlo

11 years, 6 months

RDF libraries, was Re: [ANN] IR: LV2 Convolution Reverb

by Chris Cannam

On 23 February 2011 22:11, David Robillard <d(a)drobilla.net> wrote: > SLV2 is now based on two new libraries: Serd (RDF syntax) and Sord (RDF > store). Both are roughly 2 thousand lines of C, solid and thoroughly > tested (about 95% code coverage, like SLV2 itself). Serd has zero > dependencies, Sord depends only on Glib (for the time being, possibly > not in the future). Can you point me at the API or code? I couldn't see it in a quick browse on your SVN server. I have a library (Dataquay, http://code.breakfastquay.com/projects/dataquay -- preparing a 1.0 release of it at the moment, so if anyone wants to try it, go for the repository rather than the old releases) which provides a Qt4 wrapper for librdf and an object-RDF mapper. It's intended for applications whose developers like the idea of RDF as an abstract data model and Turtle as a syntax, but are not particularly interested in being scalable datastores or engaging in the linked data world. For my purposes, Dataquay using librdf is fine -- I can configure it so that bloat is not an issue (and hey! I'm using Qt already) and some optional extras are welcome. But I can see the appeal of a more limited, lightweight, or at least less configuration-dependent back-end. I've considered doing LV2 as a simple example case for Dataquay, but the thought of engaging in more flamewars about LV2 and GUIs is really what has put me off so far. In other words, I like the cut of your jib here. Chris

12 years, 2 months

Yoshimi Midi Learn: 1st testing release

by louis cherel

Hello everyone, Every one knows Yoshimi, the fork of ZynAddSubFx. One thing was lacking to yoshimi to be perfect: to be nearly fully controlled by midi controls ( no OSC, sorry ). ZynAddSubFx had possibilities to control a few parameters with complicated NRPN, Yoshimi recently had ( in the test versions ) some features too. But now I'm proud to announce you the work of licnep ( not me, I'm just a bug reporter ) who made the "midiLearn" function for yoshimi. It's not stable for now because it's recent, and not full, but here are the present features: * Control System effects, Part Insert Effects * Master/Part Volume, Pan, System Effect Sends * Most of ADsynth parameters * Add/Remove controller * detect the channel and the number * reset the knob ( its position ) I think it's a feature that's very useful and could help many yoshimi/zyn users. To use it, that's simple: connect your controller to yoshimi, right-click on a blue knob ( yellow are ones which are not supported for now ) and click "midi Learn" move your controller, it detects automatically the controller. To see and modify controllers, go to the Yoshimi> MIDI controllers menu. To erase midi control of a knob, simply right click on it and click on "remove midi control" Here is the gitHub repository: https://github.com/licnep/yoshimi To download and install it, follow the explications link ( gitHub ): https://github.com/licnep/yoshimi/wiki/How-to A light page to understand how to control others not implemented controllers: https://github.com/licnep/yoshimi/wiki/Source-code Pages to follow the news of the project: Facebook: https://www.facebook.com/pages/Yoshimi-midi-learn/224823617534934 Twitter: http://twitter.com/#!/YoshimiMIDI So if you're interrested, all bug requests are deeply recommended. Cheers, Louis CHEREL.

12 years, 3 months

[ANN] International Conference on Spatial Audio, Nov 10-13 2011, in Detmold, Germany

by Jörn Nettingsmeier

hi *! sorry for the slightly off-topic post, but since spatial audio has been a frequent topic lately, i think some people here might be interested. linux or FLOSS won't be exactly in the limelight, but yours truly will make sure there are at least 2-3 boxes with your favourite OS and audio tools humming along in various places. oh, and you might come early and watch a few high-end mixing consoles boot - the startup screen will bring tears to your eyes (as will the price tag, unfortunately :) unfortunately, there will have to be an admission fee, which we haven't decided on yet. but we're trying to keep it reasonable. don't shout at me when it turns out to be a bit more costly than LAC, though... jörn *.* ICSA 2011 - International Conference on Spatial Audio November 10 - 13, Hochschule für Musik, Detmold Organizers: Verband Deutscher Tonmeister (VDT), in cooperation with Deutsche Gesellschaft für Akustik e.V. (DEGA), and European Acoustics Association (EAA). Contact/Chair: Prof. Dr.-Ing. Malte Kob Erich-Thienhaus-Institut Neustadt 22, 52756 Detmold Mail: icsa2011attonmeister.de Phone: +49-(0)5231-975-644 Fax: +49-(0)5231-975-689 Summary: The International Conference on Spatial Audio 2011 takes place from November 10 to 13 at Detmold University of Music. This expert‘s summit will examine current systems for multichannel audio reproduction and complementing recording techniques, and discuss their respective strengths and weaknesses. Wavefield synthesis systems, a higher-order Ambisonics array, as well as 5.1/7.1 installations in diverse acoustic environments will be available for comparative listening tests during the conference. Structured plenary talks, paper and poster sessions will revisit fundamentals and present latest research. A series of workshops will be dedicated to practical implementations of spatial sound capture and playback methods, and their esthetic and psychoacoustical implications for music perception. Concerts that include music specially arranged for the conference will let you experience various spatial sound systems in "live" conditions. Call for papers and music: Your contributions are welcome, either as presentations, posters, or workshops. Submissions will undergo a review process, and accepted contributions will be published in the conference proceedings. The conference language is English. We are planning structured sessions on the following topics: * Multichannel stereo * Wave field synthesis * Higher-order Ambisonics / spherical acoustics * 3D systems * Binaural techniques An additional session will be dedicated to related miscellaneous contributions, such as hybrid systems and perception/evaluation of spatial music reproduction.

12 years, 4 months

Feature requests: add JackSession support

by rosea grammostola

Linux Audio Developer, May I make a feature request here for your Linuxaudio application(s)? Could you please add JackSession support? It makes working with JACK standalone applications a lot more user friendly. There are some apps who support it already and they work fine, like Yoshimi, Qtractor, Pianoteq, Ghostess, Guitarix, Jack-Rack, Ardour3, Bristol, Seq24, Jalv, Ingen, Connie, Specimen and probably more. It is possible to use applications without JackSession-support in a session (via so called infra clients), it starts the applications, make the connections, but doesn't save the state. So obviously it would be far more useful if those applications would get JackSession-support also. Qjackctl is able to work as Session Manager, so is Pyjacksm (and likely Patchage in the future). According to comments on IRC by Paul Davis, it's very easy to add JackSession support to your application. "Its really easy, just handle 1 more callback from the server. Torben's walkthrough shows what is necessary." Torben's walktrough: http://trac.jackaudio.org/wiki/WalkThrough/Dev/JackSession Thanks in advance, \r

12 years, 4 months

Jack Session Manager: feature request

by rosea grammostola

Hi, It is very promising that devs like Torben, Paul Davis, Rui and David Robillard (to name a few), are 'backing up' Jack Session and that the Jack Session API is in the Jack API. This will give the community a very good chance that many apps will get JackSession support soon (or later). However, it's still reasonable to expect that not all LAD applications are going to be patched with JackSession support. In other words, there are and will be apps which might be useful (for one or more of us) to use in a session but which won't have JackSession (JS) support. From a users perspective, it would be very useful to be able to use that application (without JS support) in a session in some way nevertheless. At the moment one Session Manager (SM), Pyjacksm (Qjackctl will follow soon, and also Patchage I expect) makes this possible by manually adding 'infra clients' to a configuration file, .pyjacksmrc. See example below. Infra clients are designed for applications without a state, like a2j. But it is also possible to use apps without JS support as infra client. Amsynth is an application without JS support and in this way I am able to load amsynth, with project A. The SM makes sure that Amsynth is started and that the Jack connections are restored (that's the only thing the SM can do for you for apps without JS support). But I don't want to use Amsynth with Project A always (Session 1). I might be working on a totally different project and want to make a session for that also (Session 2). This time I want to load amsynth as: amsynth -b /home/user/projectB.amSynth.presets (I don't use Session 1 and 2 together in this example). To be able to load Session 2, I have to edit my .pyjacksmrc file or make symlinks. *Feature request*: It would be nice if the SM could provide me a way to load a different configuration file. For example: JackSessionManagerX --load configurationfileSession2 Thanks in advance, \r .pyjacksmrc: [DEFAULT] sessiondir = ~/linuxaudio/JackSession [infra] a2j = a2jmidid -e amsynth = amsynth -b /home/user/projectA.amSynth.presets configurationfileSession2: [DEFAULT] sessiondir = ~/linuxaudio/JackSession [infra] a2j = a2jmidid -e amsynth = amsynth -b /home/user/projectA.amSynth.presets

12 years, 5 months

Re: [LAD] [LAU] cancelling I/O with libsndfile

by Erik de Castro Lopo

Dan Muresan wrote: > Hi Erik -- please CC me so I can reply (I don't receive messages from > LAU directly). I'm quoting manually here: > > > > I'm trying to cancel an ongoing sf_* I/O operation (from another > > Maybe its a bad idea. :-) > > I don't think so... Issuing large requests, then cancelling as needed > gives a process the lowest possible latency for unpredictable seeks > (caused e.g. by user commands), while keeping CPU usage low (by > avoiding syscall and context switching overhead) Let me put it this way: a) When I designed libsndfile over 10 years ago, I never dreamed anybody would try this. b) In the 10 years libsndfile has been around and the probably hundreds of applications it has been used in, noone has suggested that it would be a good idea if libsndfile could do this. To me that suggests that either you have a completely unique problem to solve or that they are other solutions to your problem that other people use to get around the same problem. My guess is that your problem is not completely unique. > > Reading one frame at a time sounds like a bad idea too. > > 1 frame at a time was an extreme example. The point was that > libsndfile doesn't employ a user-space cache, but direct system calls. > Reading 10, 100 or 480 frames at a time will still incur syscall > overhead (== CPU usage), and progressively larger cancel latencies. > > > > libsndfile. It would be nice if libsndfile could allow short reads and > > > writes via some sf_command parameter. > > It does. You can read any number of frames from 1 through to as many > > frames as the file contains. > > I meant "short reads" in kernel-speak sense: read(2) can return a > number of bytes less than the number requested when interrupted by a > signal (if SA_RESTART is disabled). My proposal was to add a > sf_command() parameter that disables the looping behavior of sf_read() > on EINTR, and makes it return exactly as many frames as the first > read() call manages to get. I accept good quality, clean patches with tests for the functionality you are adding. Wherever possible, they should be cross platform. > On second thought, though, this proposal could not possibly work > without a userspace (libsndfile) cache, because read() might return > incomplete frames, which would need to be processed in a later call. Modifying libsndfile to do fread/fwrite style buffering would be relatively easy. Again, patches accepted. > > I just checked, and the address you used to post this email to the LAU > > list are not subscribed to the libsndfile-users list. Thats why the list > > is rejecting your email. > > That's exactly the problem: I subscribed about two weeks ago, received > a confirmation, Was that a confirmation or a request for confirmation? Joining a mailing list usually involves: a) Send a request to join. b) Receiving a "confirm that you want to join" message. c) Sending "confirm that you want to join". d) Receiving a "yes, you are mow a member" message. > and sent a message at that time (which received no > bounces, but no replies either). Now, the mailserver somehow forgot > about me and is rejecting my messages. Or something... All other complaints of this sort that I have received have been from people who couldn't figure out the subscribe procedure or joined from one email address and sent mail to the list from another. Cheers, Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/

12 years, 5 months

audio format abadie.jo

by pierre jocelyn andre

Bonjour, j'ai créé un nouveau format audio destiné à linux. Je suis à la recherche d'aide pour finir le langage C, pour tester, et pour créer une nouvelle générationde carte audio. J'arrive à créer des fichier audio avec des voix humaines de plusieurs Ko avec seulement 10 octets. La page d'avancement de mon projet audio se trouve ici : Http://www.letime.net/legere/index.html

12 years, 5 months

Android audio plugins

by Olivier Guilyardi

Hi guys! I just started a thread on andraudio about "Android audio plugins and advanced app interaction", including LV2 and others: http://music.columbia.edu/pipermail/andraudio/2011-June/000238.html Feel free to join in. -- Olivier

12 years, 5 months

Re: [LAD] Android audio plugins

by Jeff McClintock

> From: Nick Copeland > Don't you think it is more likely that people who are interested will run > Linux as a replacement for Android on the ARM tablets rather than have > the apps ported over? "Smartphone growth is on a meteoric rise, with Android leading the way... Android follows with 14.5%, and iOS with 13.8%. This is the first time Android has eclipsed iOS share in the InMobi network" Android penetration (14.5%) is an order of magnitude bigger than Linux desktop (at about 2%?). My prediction - Android rapidly surpasses Linux application base and mindshare. Jump on board *early* LV2 ;) Best Regards, Jeff

12 years, 5 months

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Linux-audio-dev June 2011