Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7520 discussions

alsa sequencer latency ( snd_seq_ev_schedule_real ) - need help!

by nescivi

Hiho, I am experiencing strange things with some code that uses the ALSA sequencer, with the function snd_seq_ev_schedule_real(evt, mQueue, 1, &time); The timing of this is unreliable. At times it goes as expected for a while, but then after some time large delays (minutes, instead of the expected latency of 0.1 second) are introduced. Does anyone have any idea what the problem could be? I have a code snippet below. In case anyone wants to try (the app is SuperCollider, you need the latest svn). I'm on a Debian kernel (2.6.24-1-amd64 #1 SMP Thu Mar 27 16:52:38 UTC 2008 x86_64 GNU/Linux), in case that is relevant. sincerely, Marije int SC_AlsaMidiClient::sendEvent(int outputIndex, int uid, snd_seq_event_t* evt, float late) { snd_seq_real_time time; if ((outputIndex < 0) || (outputIndex >= mNumOutPorts)) return errIndexOutOfRange; snd_seq_ev_set_source(evt, mOutPorts[outputIndex]); if (uid == 0) { // send to all subscribed ports snd_seq_ev_set_subs(evt); } else { // send to specific port int cid, pid; SC_AlsaParseUID(uid, cid, pid); snd_seq_ev_set_dest(evt, cid, pid); } long latelong; if (late > 0.f) { latelong = (long) (late * 1000000000); // new time calculation. The old one was not correct time.tv_sec = (long)(latelong / 1000000000); // seconds time.tv_nsec = (long)(latelong % 1000000000); // nanoseconds } else { time.tv_sec = time.tv_nsec = 0; } // evt->flags = evt->flags | SND_SEQ_TIME_STAMP_REAL; post("MIDI (ALSA): sending event, time %i, %i, late %f, latelong %i\n", time.tv_sec, time.tv_nsec, late, latelong); snd_seq_ev_schedule_real(evt, mQueue, 1, &time); snd_seq_event_output_direct(mHandle, evt); // snd_seq_event_output(mHandle, evt); return errNone; }

16 years, 11 months

LAC site down?

by victor

I was trying to access the conference site, but I can't seem to be able to. Is it down? Victor

16 years, 11 months

[ANN] zynjacku-3

by Nedko Arnaudov

In this release: * Plugin presets (save/restore) * Improved support for Calf plugins (various extensions needed by development version) * MIDI CC/Pitchwheel automation. Not yet available for custom UIs. Works for float parameters only. * Replace PHAT fansliders with bundled knobs. PyPhat is no longer required. * lv2dynparam host library is now optional. To enable support for dynparam plugins (lv2zynadd) lv2dynparam1 version 2 is needed. zynjacku is JACK based, GTK (2.x) host for LV2 synths. It has one JACK MIDI input port (routed to all hosted synths) and one (two for stereo synths) JACK audio output port per plugin. Such design provides multi-timbral sound by running several synth plugins. zynjacku is a nunchaku weapon for JACK audio synthesis. You have solid parts for synthesis itself and you have flexible part that allows synthesis to suit your needs. lv2rack is a host for LV2 effect plugins. You need slv2 library to compile zynjacku tarball. Project homepage with screenshots: http://home.gna.org/zynjacku/ Get tarball from here: https://gna.org/files/?group=zynjacku -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

16 years, 11 months

[ANN] lv2dynparam1-2

by Nedko Arnaudov

lv2dynparam is LV2 extension for dynamic parameters. The extension consists of a header describing the extension interface and libraries, one for plugins and one for hosts, to expose functionality in more usable, from programmer point of view, interface. Changes since version 1: * host library: API is refactored, the new API is NOT compatible with the version 1 API * host library: support for dynparam automation * host library: support for dynparam parameter save/restore Project homepage: http://home.gna.org/lv2dynparam/ Get tarball from here: https://gna.org/files/?group=lv2dynparam -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

16 years, 11 months

QJackMMC: New Qt based JACK application released!

by Alex Montgomery

Hello all, We're pleased to announce the release of a new version of jackctlmmc and a new Qt based graphical version called QJackMMC. The main page including download links and documentation is here: http://jackctlmmc.sourceforge.net/ In brief, QJackMMC is a Qt based program that can connect to a device or program that emits Midi Machine Code (MMC) and allow it to drive JACK transport, which in turn can control other programs. JackCtlMMC is a slightly simpler command-line version of QJackMMC. You might need such a tool if you have hard-disk recorders (HDRs) or other external MIDI compliant devices that are capable of sending out MMC to keep other devices in sync. You might have a multi-track recorder and you want to be able to start, stop, or fast-forward JACK-based programs such as Rosegarden, Hydrogen, and Ardour. Enjoy, -- Alex

16 years, 11 months

wfs streaming project report

by Jörn Nettingsmeier

hi guys! today i felt a little bored and needed to do something to avoid finishing my lac paper, so i brushed up the documentation about the wave field synthesis live streaming project that i did for tu berlin last year. if you need to kill some time and enjoy reading war stories with linux audio, really loud music and infrared lasers in them, have a go at http://stackingdwarves.net/public_stuff/event_documentation/wfs_live_transm… best regards, jörn

16 years, 11 months

LAC2009

by Fons Adriaensen

Hello all, Many thanks to all who have responded to yesterday's message ! There is still room for more, so start writing the paper you always wanted to write, or preparing the workshop you always wanted to do... The paper deadline will be extended to the 29th of this month. Some practical info: There are no formal calls for workshops or for participating in the Linux Sound Night on the conference website. For both just drop me line. Regarding the LSN, I had a meeting with the management of the Teatro Lenz this afternoon. Lenz is very much one of the 'alternative' cultural organisations in Parma, and would be the natural place for something like the LSN. Normally they would be organising a festival in April and May, and the LSN would fit in very well into it, allowing it to be organised at minimal cost. But thanks to the new cultural politics of the government guided by Il Cavaliere (Berlusconi) Lenz won't have any funding until September, and has to cancel the festival. It's probably still possible to use the location, and anyway we'll do whatever is needed to get the LSN organised. We will add some travel and visitor info to the website early next week. Earlier some of you expressed the desire for developer meetings, brainstorms or working sessions. I'd ask any specific groups who want to meet in Parma to get organised and keep me informed. Finally, it's *freezing* cold here right now, but I promise more enjoyable meteorological conditions in April ! Ciao, -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia O tu, che porte, correndo si ? E guerra e morte !

16 years, 11 months

[OT] Joomla dev needed

by Patrick Shirkey

Hi, I have a smallish paid in cash contract available for someone with solid Joomla dev experience to work on over the next couple of months. Please contact me off list for more details if you are available. Cheers. -- Patrick Shirkey Boost Hardware Ltd.

16 years, 11 months

LAC2009: Paper deadline extended!

by Frank Neumann

This mail is to inform you that the paper submit deadline for the LAC2009 (Linux Audio Conference)(1) has been extended to January 29th, 2009. So, if you have been shocked by the fact that the initial planned deadline would be tomorrow, HERE is your chance to get your half-cooked paper/idea into a good shape and submit(2) it now! :-). (1) The LAC (Linux Audio Conference) is an annual event where developers, users and composers from all around the world come together for 4 days to present current developments, new compositions and other news to the public, listen to concerts, and generally have a good time together. The LAC2009 is taking place at the Casa della Musica in Parma, Italy, from April 16th to 19th, 2009. The conference homepage is at http://lac.linuxaudio.org/2009/. (2) Paper submission information: http://lac.linuxaudio.org/2009/call-for-papers/ Paper submission upload form: http://lac.linuxaudio.org/2009/openconf/openconf.php Keep 'em coming, Frank, on behalf of the LAC2009 organization team

16 years, 11 months

Re: [LAD] [LAU] Invitation to Southern California Linux Expo 7x

by Gareth J. Greenaway

Hi, As a matter of fact I do. I just forgot to include it in the original email. If you use the promo code AUDIO, you'll receive a 50% discount off a full price pass. Thanks! Gareth Tobiah wrote: > >> The Southern California Linux Expo is fast approaching > > $60 is a little steep for me. Have any priority codes > for LAU'rs? :) > -- Gareth J. Greenaway | g(a)socallinuxexpo.org Voice - 877-831-2569 x130 Southern California Linux Expo http://www.socallinuxexpo.org

16 years, 11 months

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Linux-audio-dev