Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

4 participants
7502 discussions

Fwd: Re: How can a LV2 plugin know on what host's MIDI Channel it's on?

by Phil CM

-------- Forwarded Message -------- Subject: Re: [LAD] How can a LV2 plugin know on what host's MIDI Channel it's on? Date: Thu, 16 Oct 2014 13:16:38 -0400 From: Paul Davis <paul(a)linuxaudiosystems.com> To: Phil CM <philcm(a)gnu.org> On Thu, Oct 16, 2014 at 12:59 PM, Phil CM <philcm(a)gnu.org <mailto:philcm@gnu.org>> wrote: On 16/10/14 17:15, Paul Davis wrote: > > > On Thu, Oct 16, 2014 at 11:42 AM, Phil CM <philcm(a)gnu.org > <mailto:philcm@gnu.org>> wrote: > > Is there a way to retrieve this info (and others, ideally) > from the host, thus removing the need for a "midi channel" > control port? > > > I think you're confused. The host doesn't put a plugin on a MIDI > channel. It delivers MIDI events to the plugin which might be on > any channel. But in Qtractor I do have a choice of what MIDI channel (or any/omni, for that matter) I'm sending signal to on that particular track... So, no? No way for the plugin to retrieve any info from the host (I mean specific info, not just instantiated, port enum et al) I guess it makes sense since it would introduce a breaking point. Sorry, I don't really speak english, I'm just persuaded I do. That is a host-specific issue. The part of the LV2 specification and the existing extensions don't describe that functionality. As far as the plugin is concerned, it just gets MIDI events. If the host is filtering some of them, the plugin has no way to determine this programmatically.

10 years, 8 months

Alsa and multiple bluetooth devices

by Andres Cabrera

Hi, I'm wondering if Alsa and bluetooth on Linux support connecting simultaneously to multiple bluetooth devices. I don't want to send the same output to the different bluetooth devices, I rather want a wireless multichannel system (but no need for sample accurate sync). Has anyone ever tried this or had any experiences to share? Thanks! Andrés

10 years, 8 months

suil error: Unable to open UI library

by Phil CM

Hello LADs I'm trying to make a GUI for a LV2 synth based on so-404. In fact, I'm trying to learn C / C++. I got everything to build OK, but I'm stuck on a hard to read execution error ; when I load the plugin in jalv, it loads it OK, but fails to load the UI and says : suil error: Unable to open UI library /usr/local/lib/lv2/kis.lv2/kis_gui.so (/usr/local/lib/lv2/kis.lv2/kis_gui.so: undefined symbol: _Z17instantiateSO_404PK15_LV2_DescriptordPKcPKPK12_LV2_Feature) (The architecture is based on https://github.com/harryhaaren/lv2/tree/master/plugins/eg-sinsynth.lv2 in fact it is exactly the same : synth.c/h, synth_gui.cpp, widget.cpp/h, built as synth.so synth_gui.so synth.ttl and manifest.ttl using waf). I must say I'm still to fully understand the concept of descriptors... Can somebody see what I'm doing wrong? Thanks --Philippe "xaccrocheur" Coatmeur

10 years, 8 months

Re: [LAD] suil error: Unable to open UI library

by Phil CM

I'm almost there: ⚡ jalv.gtk https://bitbucket.org/xaccrocheur/kis Plugin: https://bitbucket.org/xaccrocheur/kis UI: https://bitbucket.org/xaccrocheur/kis#gui UI Type: http://lv2plug.in/ns/extensions/ui#X11UI JACK Name: Kis Block length: 512 frames MIDI buffers: 32768 bytes Comm buffers: 524288 bytes Update rate: 25.0 Hz SO-404 v.1.2 by 50m30n3 2009-2011 controlmode = 1.000000 volume = 50.000000 cutoff = 50.000000 resonance = 100.000000 envelope = 80.000000 portamento = 64.000000 release = 100.000000 channel = 1.000000 frequency = 440.000000 suil error: Failed to find descriptor for <https://bitbucket.org/xaccrocheur/kis#gui> in /usr/local/lib/lv2/kis.lv2/kis_gui.so Please, give me a pointer to a basic implementation of that descriptor thing, somebody, please end my misery. --Phil On 15/10/14 20:17, Paul Davis wrote: > > > On Wed, Oct 15, 2014 at 2:24 PM, Phil CM <philcm(a)gnu.org > <mailto:philcm@gnu.org>> wrote: > > Hello LADs > > I'm trying to make a GUI for a LV2 synth based on so-404. In fact, > I'm trying to learn C / C++. > > I got everything to build OK, but I'm stuck on a hard to read > execution error ; when I load the plugin in jalv, it loads it OK, > but fails to load the UI and says : > > suil error: Unable to open UI library > /usr/local/lib/lv2/kis.lv2/kis_gui.so > (/usr/local/lib/lv2/kis.lv2/kis_gui.so: undefined symbol: > _Z17instantiateSO_404PK15_LV2_DescriptordPKcPKPK12_LV2_Feature) > > > > % echo _Z17instantiateSO_404PK15_LV2_DescriptordPKcPKPK12_LV2_Feature > | c++filt > instantiateSO_404(_LV2_Descriptor const*, double, char const*, > _LV2_Feature const* const*) > % > > your plugin is missing a symbol (instantiateSO_404(...)), apparently. > > > > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev(a)lists.linuxaudio.org > http://lists.linuxaudio.org/listinfo/linux-audio-dev

10 years, 8 months

[OT] Duplicate messages originating from dspam@snarchi.io

by Fons Adriaensen

Hello all, Since some time I do get duplicate messages on this list for example the last one just a few minutes ago: > Date: Sun, 5 Oct 2014 23:35:21 +0200 > From dspam(a)snarchi.io Sun Oct 5 21:35:55 2014 > From: tom(a)trellis.ch > To: Fons Adriaensen <fons(a)linuxaudio.org> > Cc: linux-audio-dev(a)lists.linuxaudio.org This seems to happen only to messages which are a reply to one I sent. The 'dspam(a)snarchi.io' address seems to be related to 'marcochapeau', a name I've seen before on this list. I just wonder if I'm the only one getting these. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)

10 years, 8 months

build problem with ambix plugins + LV2

by Jörn Nettingsmeier

Hi Matthias, I'm trying to build your ambix plugin suite on Linux using the LV2 wrapper, which fails with the following problem during makefile generation: CMake Error at CMakeLists_subprojects.txt.inc:104 (ADD_LIBRARY): Cannot find source file: /local/build/ambix/JUCE/modules/juce_audio_plugin_client/LV2/juce_LV2_Wrapper.cpp Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx Call Stack (most recent call first): ambix_binaural/ambix_binaural/CMakeLists.txt:20 (INCLUDE) It seems that the JUCE tree in your repo does not have an LV2 directory at all, and neither has the official JUCE repo - has it been dropped? Any hints much appreciated, best greetings from Essen to Vilnius, Jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net

10 years, 8 months

Advanced Gtk+ Sequencer API online

by Joël Krähemann

Hi all Please take a look at http://ags.sf.net/api/ags and let me know what you're missing. There may follow some corrections if you find mistakes let me know, too. At the moment there probably plenty of them. kind regards Joël

10 years, 8 months

Linux audio jobs/companies?

by Bill Gribble

It's job hunting time, and while I am skeptical that there are very many paying jobs for Linux audio developers out there, I thought I'd at least ask on this list. What companies are doing work in the Linux audio universe? Or, on the other side, anybody know of interesting music-instrument/audio companies located in or around NYC (where I live) who might need Linux folks for their web presence or other online stuff? Any tips appreciated! Thanks, Bill Gribble

10 years, 8 months

media clock from wall clock

by Len Ovens

I have been playing with numbers (a little) for AoIP and AES67 (because I can actually read the spec). The media clock (AKA wordclock) is derived from the wall clock which is synced via PTP. There are 3 sample rates supported 44.1k (not sure if any physical devices really do), 48k and 96k. The first thing I find is that it is not possible to get even word clock via simple math. The wall clock moves one tick per usec which at 48K is 20.833rep. (44.1k is a mess) I would suggest this is why AVB and AES67 at lowest latency already uses 6 sample frames which is a nice even 125 usec. It is obvious to me from this, that the true media clock is derived by external circuitry. The one "must support format" is 48k at 48 samples/packet. (both 16 and 24bit on the receive end of a stream) This is 1ms packet time. (there are AoIP devices that only support AES67 with this format) So I am guessing that it must be easy to derive a media clock from a 1ms clock input. The computer (CPU board) would have a GPIO with a 1ms clock out derived from the cpu wall clock which in turn is kept in sync with the network via PTP. I am guessing there is already a chip in production that does this with almost no support circuitry. The side effect of the 1ms/packet standard is that streams are limited to 8 channels at 48K and 4 channels at 96k. So for more channels more streams are required. This maximum comes from the limit that the full packet must fit into one standard ethernet packet with the MTU at 1500 (minus headers etc.). The transport does not do packet reassembly of fragmented packets and basically drops them. 1 ms latency in the jack world is the same as 16/3. This may explain why /3 works better for other formats such as USB or FW. It may also be the bridge that works best with OPUS at 5 ms. -- Len Ovens www.ovenwerks.net

10 years, 8 months

Lars Luthman

by Will Godfrey

Is anyone in contact with Lars? I tried to send him an email but it immediately bounced, so i think I've got an address that's no longer valid. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

10 years, 8 months

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

Linux-audio-dev