Linux-audio-dev

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7445 discussions

by Gerald Mwangi

Hi, well I'm also not the auto spellcheck guy. I just need something that saves the state of the session. No auto bla bla. It should save, when I click 'save session', pressumebly just causing all the apps to do their internal save operation. > +1 for Calf Monosynth and WhySynth. They, in addition to AMS and PHASEX, are the synths I've used most. > > Zyn is kind of old and doesn't do RT; the new thing is Yoshimi, and I dunno if it supports LASH or ladish, but I'd guess both. > > For the record, I *HATE* session management and I don't run LASH at all when I can avoid it (IIRC, there's some synth that I use or used which requires LASH, so I occasionally have to start it up). > > I generally can't stand technologies that try to be "smart" and do things I don't explicitly instruct them to do. Frustrates the hell out of me. > > FWIW, I am also the kind of guy who turns off autocomplete and spelling checkers whenever I can. > > -ken

14 years, 7 months

Re: [LAD] [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, 7 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, 7 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, 7 months

Smallest, simplest, silliest SDR?

by Gordon JC Pearce

I wanted a very simple SDR with jack inputs and outputs for a demonstration I was doing. I had a look at the DSP guts of dttsp and quisk, and sat down to code. Now, since I wanted to demonstrate how you could use LADSPA filters to clean up received audio, it occurred to me that I should implement my SDR core as a LADSPA plugin. So, I did. It "works for me". If you try it out, let me know how you get on. At 256 frames/period it sits at about 3% usage on my P4-2.8 without any other LADSPAs running - not bad, but it probably could be better. If you want to build it, get the code with: git clone git://lovesthepython.org/ladspa-sdr.git then build it with scons. You'll need to manually copy the resulting sdr.so to wherever your LADSPA plugins live. Load it up in jack-rack and add in an amplifier plugin (there's no AGC) and some sort of filter (I recommend the Glame Bandpass Filter). Performance and quality isn't exactly amazing, but for less than 300 lines of code - much of that used to set up the plugin - it's not too bad. Gordon MM0YEQ

14 years, 7 months

wanted: good online reading material for RT audio/midi software design?

by Harry Van Haaren

We seem to be fairly intrested in the same things James! I don't know if you have access to University Lecturers... if you do, go have a chat with the software engineer lecturer. I've only had positive experiences when approaching them about "totally-unrelated-to-course" projects. On the other hand, I bought a book (forget the exact name.. can find out) which showed some of the basic ObjectOrientated stuff, but at the same time, I found it to be relatively useless when trying to apply it to "music-software". (Ie: Ardour, Seq24, Dino, etc kind of programs) Spending time doing out program diagrams.. (you know the "standard" boxes approach to explaing how classes interact.) That's been my approach, I didnt really find any great resources online. If you do find any, please post back here! :-) Good luck, -Harry

14 years, 7 months

ambisonics UHJ encoder

by alex stone

Jorn, Fons, i'm looking for a ladspa UHJ encoder, and can't seem to find one. Any idea if such a beast exists? Or if there's a standalone instance or ambdec preset i can use, and route in and out of? Jorn ,i've had several browses over your web examples of using AMB plugins with Ardour, and have reflected the setup where possible in Non-Mixer. I'm using samples (ala LSampler) for noise, but i'll ask here, what's the function of using the tetraproc mike plugin over something else? I'm lost in your explanation. I'm still getting my feet wet in ambisonics, and making plenty of errors along the way, but progress seems imminent. (as it always does i guess, for the optimistic among us.) Some general questions. When i use Jconvolver standalone (my preference) and test with a *amb.conf, i get 1 input and 4 outputs WXYZ. Is this correct for 4 signals coming into 1, into the *amb.conf, or do i need to change this to reflect individual WXYZ routing, from something like a MASTER strip, or from an ambdec plugin in a channel strip? (i'm trying to get the signal chain sorted out correctly.) i.e. 4 in, 4 out. I'm using all mono ins for sound sources, and want to reflect positioning in the busses, as i have multitrack 1st violins, 2ndviolins, etc... So my 1st violins (4 monotracks) are going into a 1stviolin buss (4 ins) and in the buss signal chain, i'm adding a ladspa amb mono panner, which naturally gives me 4 outs, then the chain continues to the MASTER and jconvolver, back into a jconv buss in the mixer with the intent of finally routing that to the UHJ buss... Should i then stay "faithful" to that signal chain, and up to a UHJ encode to stereo (which i hope is in ladspa existence) maintain the 4 port stream to stay compliant with WXYZ? The intent with this is provide ambisonic positioning, and convolver tail, right up until downsizing to stereo as the last part of the signal chain. I'm finding the challenge of this interesting, and may have more questions as more of this slowly seeps into my head. Feel free to point out obvious errors, or alternative (meaning smarter) suggestions. Alex. -- www.openoctave.org midi-subscribe(a)openoctave.org development-subscribe(a)openoctave.org

14 years, 7 months

wanted: good online reading material for RT audio/midi software design?

by James Morris

Anyone know of any good reading material freely available online focused on real time audio/midi software design? As examples, of what I've found so far: (and what's wrong with them) Parts of this are helpful, but far too generalized: http://www.cs.st-andrews.ac.uk/~ifs/Books/SE7/Presentations/PDF/ch15.pdf Whereas this is far too technical, and also massively generalized: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.109.6980&rep=rep1&… Cheers, James.

14 years, 7 months

Jack port alias names

by Tim E. Real

Good day... Just coming to grips working with and learning the alias system... Under what conditions might a Jack port not have any alias names? When might I expect to encounter that situation? Because our app supports both ALSA midi and Jack midi, the app's very own ALSA ports are showing up in its list of Jack midi ports. We don't want our own ALSA ports listed in there. So to filter them out of our Jack midi ports list, I look at the port's (first) alias name and see if the app's name is in there, and filter out the port if it's a match. So far so good, but I'm worried what happens if there's no alias to work with. I can't figure out a way to determine if a non-aliased name like "system:midi_playback_4" actually belongs to our app's own ALSA ports. I don't know how or if 'alias renaming' will affect my plans. Still learning + investigating much about this system. Thanks. Tim.

14 years, 7 months

2.6.31.x vs. rme vs. alsa 1.0.22?

by Fernando Lopez-Lezcano

Hey, has anyone been seeing strange behavior from this combination? kernel 2.6.31.x rt20 + alsa 1.0.22 userland RME card (pcmcia card + multiface) hdspmixer is not doing the right thing (does not initialize the card in a way in which playback works), it does not see the hwdep interface (or something like that) and disables metering, alsamixer even segfaults when I reach the end of the controls listed. Plain weird. Smells like something changed deep in the kernel that makes alsa-lib very unhappy. Alsa-tools rebuilt from source does not make a difference. Weirdness goes away when I boot into 2.6.29.6 rt23... Is there anything in alsa-* that depends on which _kernel_ is available at compile time? -- Fernando

14 years, 7 months

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Linux-audio-dev