Linux-audio-dev

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7516 discussions

Re: [LAD] a small jack-session extension, proposal - was: Feature requests: add JackSession support

by Emanuel Rumpf

2011/7/11 Renato <rennabh(a)gmail.com>: > On Sun, 10 Jul 2011 19:43:53 +0200 rosea grammostola wrote: >> On 07/10/2011 06:33 PM, Emanuel Rumpf wrote: >>> >>> http://wiki.linuxaudio.org/wiki/user/emrum/jack_session_2_draft >>> >> Good job. I added some comments. Thank you. >> > > just wanted to notify that one of the "additional ideas" is asking > support for multiple sessions, while one of Emanuel's > "conclusions" (first bulleted list, third item) says that this is now > possible but should actually not be, as it could be an error-source. > I am for/pro multi-session, IF it is completely reliable, works without hassle (including user-handling) and doesn't complicate implementation too much. That might be possible. Eventually. The current behavior, to me, feels strange and unexpected, though: Opening a running session (twice) opens another set of windows. What's that ? Do I have a "doubled" session now ? It is very opaque, unclear, which window belongs to which session. Is that how it should be, is that what we'd want ? I'm adding a new section to the wiki page, "(Multi-) Session Handling". -- E.R.

14 years, 3 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

14 years, 3 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

14 years, 4 months

[LAA] [ANN] guitarix release guitarix2-0.17.0

by hermann

guitarix/gx_head is a simple guitar mono tube amplifier simulation. please refer to our project page for more information: http://guitarix.sourceforge.net/ new features in short: * fixed jack session support * add amp-model (push/pull) * add amp-model (feedback) * fix build/runtime issue on OSX * reformat source to the Google C++ Style Guide conventions * some minor fixes and maybe new bugs have fun _________________________________________________________________________ guitarix is licensed under the GPL. screen-shots and sound examples: http://guitarix.sourceforge.net/ direct download: http://sourceforge.net/projects/guitarix/files/guitarix/guitarix2-0.17.0.ta… download site: http://sourceforge.net/projects/guitarix/ please report bugs and suggestions in our forum: http://sourceforge.net/apps/phpbb/guitarix/ ________________________________________________________________________ For extra Impulse Responses, gx_head uses the zita-convolver library, and, for resampling we use zita-resampler, both written by Fons Adriaensen. http://kokkinizita.linuxaudio.org/linuxaudio/index.html We use the marvellous faust compiler to build the amp and effects and will say thanks to : Julius Smith http://ccrma.stanford.edu/realsimple/faust/ : Albert Graef http://q-lang.sourceforge.net/examples.html#Faust : Yann Orlary http://faust.grame.fr/ ________________________________________________________________________ For faust users : All used Faust dsp files are included in /gx_head/src/faust, the resulting .cc files are in /gx_head/src/faust-generated The tools we use to convert (post-processing and plot) the resulting faust cpp files to the needed include format, stay in the /gx_head/tools directory. ________________________________________________________________________ regards guitarix development team

14 years, 4 months

Re: [LAD] audio format abadie.jo

by Ralf Mardorf

Pierre, I suspect it was intended to send it to the list? -------- Forwarded Message -------- From: pierre jocelyn andre To: Ralf Mardorf Subject: Re: [LAD] audio format abadie.jo Date: Thu, 7 Jul 2011 08:06:36 +0200 Oui c'est exactement ça " He's looking for help with the C language, testing, and creating a new generation of audio card", sauf que je ne demande pas d'aide, je donne des bases pour pouvoir développer. Chacun est libre de modifier, de garder ou de donner ses sources. La seule limite est dans la licence que j'ai fixé. L' allemand, ou en néerlandais sont des langues compatibles, mais cela fait trop longtemps que je ne les ai plus parlé. Effectivement avec 10 octets " 10 bytes english", je reproduis une voix humaine "human voice" J'espère que ce concept audio sera celui de linux pour les prochaines générations, car beaucoup plus performant, moins gourmand en ressources, moins gourmand en énergie, et qui possède sa propre technologie. Amicalement 2011/7/7 Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> On Wed, 2011-07-06 at 19:11 -0400, Tim E. Real wrote: > On July 6, 2011 05:33:44 am Florian Paul Schmidt wrote: > > > Http://www.letime.net/legere/index.html Scrolling down, at the bottom of the webpage there's Google translate. The English translation seems to be better than the German translation. > > Hi, > > > > I think you'll get more responses if you state your text in english. > > Good luck, > > Flo > > Hi Florian. We meet again, on LAD! > > I think he says he has created a new audio format for Linux. > He's looking for help with the C language, testing, and creating a new > generation of audio card. > The next part I'm not sure. I think it says he has created an audio file > with human voices using only ten octaves? Don't know what 'Ko' is. > > I'm English Canadian with some French knowledge. > We were all taught French in school, long ago. > Tim.

14 years, 4 months

Hello World in LV2

by Olivier Guilyardi

Hi, Looking around the LV2 Trac at http://lv2plug.in/trac/, I don't see any simple introduction on how to create a minimal plugin. Is there any plan for this? I think that a gain plugin tutorial could be a way to show how to say Hello World in LV2. Something very short, which include proper links to reference documentation. Not a long story as "LV2 programming for the complete idiot" which IIUC also happens to be obsolete. In addition to helping the newbie find his way, one advantage of a short and simple tutorial is that it should be easy to maintain when LV2 evolves. And as an alternative or companion to the tutorial, the source code for a minimal (official) example would be great. I mean, the kind of example that you find in JACK source code. Does a such thing already exist? -- Olivier

14 years, 4 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/

14 years, 4 months

rakarrack & jack session & jack1 & jack2

by Josep Andreu

Hi I have recently added jack session support to rakarrack ... I was check with jack1 ...and session is restored perfectly even if I use a lot of rakarrack instances with others apps .... but ... I have problems with jack2 ... if I use more than one instance of rakarrack ... sometimes works ... but most times some instances of rakarrack are unable to open jack client ... believe me I changed everything to try to fix but I really don't know why that happens .... you know me I'm not a programmer .. :-( If someone can tell me something about how to fix that I will really appreciate :-) I use debian with the lastest svn jackmp installed in /usr/local .. also I have the jack1 debian package installed in /usr .. I dont know if that can be a problem ... anyway the jack2 server runs perfect ... in fact normally I use jack2 because runs better on my computer ... and of course I can open manually all the rakarrack instances I want .... Sorry I'm lost .. :-) Josep -- Josep Andreu <holborn(a)telefonica.net>

14 years, 4 months

[ANN] jack-file 1.0

by Dan Muresan

Hi, jack-file 1.0 is available on github: http://danmbox.github.com/jack-file/ It contains file2jack, a Jack transport-centric audio player that maps files onto the (optionally periodic) transport timeline. It can map one or several files to arbitrary positions on the transport timeline, and if requested it can make the timeline "appear" to loop (without actually moving the transport -- so no playback gaps! file2jack simply sends out a periodic waveform). There is also jacktransportloop, a simple utility to force the transport to shuttle back and forth between two endpoints (this one will, of course, create gaps, but is useful to control other applications). Thanks to all those who have been helped via LAD regarding libsndfile and jack. -- Dan

14 years, 4 months

Re: [LAD] audio format abadie.jo

by Dan Muresan

> Amicalement et peut être à bientot sur un autre projet qui impose moins de > contrainte. Regardless of where you choose to announce and grow your project, you will eventually have to publish in some English-speaking signals & systems-related journal, if you have an original scheme. For the sake of your own time, and ESPECIALLY that of your would-be contributors, you should attempt to do this sooner rather than later. You may well end up finding that your scheme doesn't bring any measurable benefit to the table, or worse (in the way that most home-grown crypto schemes fare). -- Dan

14 years, 4 months

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Linux-audio-dev