Linux-audio-dev November 2014

linux-audio-dev@lists.linuxaudio.org

14 participants
10 discussions

by Tim Goetze

http://quitte.de/dsp/caps.html The latest release of the caps audio plugin suite contains a number of bug fixes and improvements as well as changes intended to make it more suitable for low-power systems. http://quitte.de/dsp/caps.html#CHANGES Most notably, support for a variety of little-used features has been dropped, reducing the binary size by roughly a third. There's also a new plugin implementing simplistic linear emulation of several guitar amplifier loudspeaker cabinets with reduced computational complexity: http://quitte.de/dsp/caps.html#CabinetIII The compressor plugins now report current gain reduction: http://quitte.de/dsp/caps.html#Compress http://quitte.de/dsp/caps_0.9.24.tar.bz2 Cheers, Tim

4 years, 7 months

Design of similar LV2 plugins

by Aurélien Leblond

While porting AlsaModularSynth modules to LV2 plugins, I was wondering something... AMS has some similar modules where the only thing changing is the number of inputs (Mixer with 2, 4 or 8 inputs), the number of outputs (CV source with 2, 4 or 8 outputs) or the number of VCOs/Envs/etc. (DynamicWaves with 4, 8 or 16 VCOs). In AMS there is only one class for such plugins and AMS would pass the number of inputs/outputs/sections/etc. when creating the different modules. I couldn't find an easy way to reproduce this in LV2 plugins, therefor so far I have been creating different LV2 plugins for each and everyone of them and doing a lot of copy/past/editing. That let me to wonder if there wouldn't be a better way. The pros: - it's easier to maintain if I have only one class - it's a lot less boring than doing a lot of copy/past/editing - I have been doing it only for simple ones so far like Mixers or CV source, but now I'm starting to port DynamicWaves which is way more complex The Cons: - I have the feeling that gaining on code simplicity actually decrease the performance when the plugin is running - i can imagine it to be less strainuous on the CPU to have simple code instead of dealing with loops and arrays Being a rare case I can't imagine the need to have this supported directly in LV2, but I was wondering if people with more talent than me in creating audio software might have some advice? Aurélien

8 years, 5 months

Linux Kernel Lockup

by Will Godfrey

I don't know if anyone here has heard about this. I discovered the link quite by accident. http://lkml.iu.edu/hypermail/linux/kernel/1411.3/02866.html If you're using 3.17 it might be an idea to step back to 3.16, which so far seems to be OK. I've been using 3.16 for several months now and not had any problems. -- 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.

8 years, 5 months

[ANN] Qtractor 0.6.4 - The Baryon Throne beta release!

by Rui Nuno Capela

Aw, snap! Wait, there's no big deal (nor chromium's) cosmic (mis)alignment being announced here now. Rest calm. Sorry to delude some of you :) But, there's one (notable) leap on this tiny side and part of the universe... (or is it a multiverse? move along...) What I really want to tell is all about this happening and none else's freaking business: Qtractor 0.6.4 (baryon throne beta) is released! Release highlights: * Punch-in/out over loop-recording/take modes (NEW) * Latch/momentary MIDI Controllers toggle mode (NEW) * JACK client/port pretty-name (metadata) support (NEW) * Custom style and color themes (NEW) * Mixer strip multi-row layout (NEW) * Muted audio tracks monitoring on playback (FIX) * Clip fade-in/out resize on time-stretch (FIX) As for the clueless (as if there's any): Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt4 framework. Target platform is Linux, where the Jack Audio Connection Kit (JACK) for audio and the Advanced Linux Sound Architecture (ALSA) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Well, although this being yet another milestone--if one may call it that way--it also makes it official (yes, deeply engraved in stone) and definitive as a migration to Git can be, as for source-code control and management (it's a dirty job I know, but someone has to do it, right?). Nevermind. It's done. Meanwhile, please, don't ever hesitate to ask whether any of the above does affect you some way or another. Or maybe anything else, yay? Indeed, the puzzled you feel, the better :) Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://download.sourceforge.net/qtractor/qtractor-0.6.4.tar.gz - source package (openSUSE 13.2): http://download.sourceforge.net/qtractor/qtractor-0.6.4-14.rncbc.suse132.sr… - binary packages (openSUSE 13.2): http://download.sourceforge.net/qtractor/qtractor-0.6.4-14.rncbc.suse132.i5… http://download.sourceforge.net/qtractor/qtractor-0.6.4-14.rncbc.suse132.x8… - quick start guide & user manual (see also: the wiki): http://download.sourceforge.net/qtractor/qtractor-0.5.x-user-manual.pdf - wiki (help wanted!): http://sourceforge.net/p/qtractor/wiki/ Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - Fixed some old loop-recording clip drawing glitches. - Current assigned track/channel instrument definition names for MIDI controllers, note keys, RPN and NRPN, are now in effect on the MIDI clip editor drop-down lists, whether available. - Clip/Take/Range... input dialog values are now properly sanitized as long to prevent invalid take/folding ranges. - Audio capture/export file type default now set to "wav". - Extending punch-in/out over loop-recording/takes modes. - Make audio tracks monitoring always flow while playback is rolling, independently of their mute/solo state. - Fixed undo/redo conversion of audio clip offsets under (automatic) time-stretching eg. due on tempo changes. (ticket by Holger Marzen, thanks). - Latch/momentary MIDI Controllers toggle mode introduced (a request by AutoStatic aka. Jeremy Jongepier, thanks). - JACK client/port pretty-name (metadata) support is being seamlessly introduced. (EXPERIMENTAL) - Audio frame/MIDI time drift correction is now an option on View/Options.../MIDI/Playback/Enable MIDI queue time drift correction. - Transport auto-backward feature now honoring last position playback was started. - Introducing brand new application user preferences on View/Options.../Display/Options/Custom style and color themes (eg. "KXStudio", by Filipe Coelho aka. falkTX). - Mixer widget gets automatic multi-row strip layout. - Clip fade-in/out now follows time-stretch resizing, via shift/ctrl+click and drag one of its edges. - Fixed a typo causing FTBFS when VST plug-in support is explicitly disabled (./configure --disable-vst). See also: http://www.rncbc.org/drupal/node/834 Enjoy && have plenty of fun. -- rncbc aka. Rui Nuno Capela

8 years, 6 months

[LAU] [LAA] Guitarix 0.32.0 released

by hermann meyer

The Guitarix developers proudly present Guitarix release 0.32.0 For the uninitiated, Guitarix is a tube amplifier simulation for jack (Linux), with an additional mono and a stereo effect rack. Guitarix includes a large list of plugins[*] and support LADSPA / LV2 plugs as well. The guitarix engine is designed for LIVE usage, and feature ultra fast, glitch and click free, preset switching, full Midi and/or remote controllable (Web UI not included in the distributed tar ball). Here is the " Ultimate Guide to Getting Started With Guitarix <http://libremusicproduction.com/articles/ultimate-guide-getting-started-gui…>" This release fix the bug #16 "empty effect menu with clear-skin option", add new tuning scales (19- and 31-TET) to guitarix and Gxtuner.lv2, add Midi Clock and Jack Transport support to guitarix and move a couple of controllers from unit:ms|hz to unit:bpm, so that they could easy synced with the Midi Beat Clock. and introduce a new LV2 plug: * GxMultiBandReverb Please refer to our project page for more information: http://guitarix.sourceforge.net/ Download Site: http://sourceforge.net/projects/guitarix/ Forum: http://guitarix.sourceforge.net/forum/ Please consider visiting our forum or leaving a message on guitarix-developer(a)lists.sourceforge.net <mailto:guitarix-developer@lists.sourceforge.net> regards hermann

8 years, 6 months

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

by Phil CM

Is there a way to retrieve this info (and others, ideally) from the host, thus removing the need for a "midi channel" control port? Also, is there a way to tie the "volume" controller of the host (in Qtractor's case, the volume fader of the mixer strip) to one "volume" control port of the plugin, thus removing the need for the "control mode" control port ? Yes because you see, here in my Qtractor (latest SVN - but it has always been that way) I can either edit the plugin (about 50% of my plugins behave that way) controls but then the mixer's volume is inoperant, or control the volume w/ said mixer but NOT the plugins controls. How can I have my cake and eat it? Ta-ta --Phil

8 years, 6 months

DTS-HD bits out HDMI port

by Kip Warner

Hey list, I'd like to be able to stream DTS-HD Master Audio bits out the HDMI port in their compressed form - not decompressed to LPCM. I'll let the receiver handle the decoding. From what I can gather, this may be possible with the ALSA API, provided the HDMI port is >= 1.3 and the audio card supports high bit-rate (HBR). Is my thinking way off? Is there a more suitable API or approach for this? If it requires specific hardware, I am less concerned about that as I am the feasibility of the end goal. Regards, -- Kip Warner -- Senior Software Engineer OpenPGP encrypted/signed mail preferred http://www.thevertigo.com

8 years, 6 months

Midi Beat Clock to BPM

by hermann meyer

Hi I try to fetch the bpm from the Midi Clock, and stumble over "jitter". So I start to collect data for a larger amount of time, but it wouldn't help. Here is what I do: else if ((in_event.buffer[0] ) == 0xf8) { // midi beat clock clock_gettime(CLOCK_MONOTONIC, &ts1); time0 = (ts1.tv_sec*1000000000.0)+(ts1.tv_nsec); static int collect = 0; static int bpm = 0; bpm += ((1000000000 / (time0-time1) / 24) * 60); // nanosec to bpm collect+=1; if (collect >=30) { set_bpm_val(bpm/collect); collect = 0; bpm = 0; } timed = time0-time1; // printf("Midi clock event %X time0 %f time1 %f timed %f ts1.tv_nsec %lu\n",in_event.buffer[0], time0, time1, timed, ts1.tv_nsec); time1 = time0; } else if ((in_event.buffer[0] ) == 0xfa) { // midi clock start printf("Midi clock start\n"); //set_ctr_val(MIDICLOCK, 1); } else if ((in_event.buffer[0] ) == 0xfb) { // midi beat clock continue //set_ctr_val(MIDICLOCK, 1); printf("Midi clock continue\n"); }else if ((in_event.buffer[0] ) == 0xfc) { // midi beat clock stop //set_ctr_val(MIDICLOCK, 0); printf("Midi clock stop\n"); } else { printf("CC number %x\n", in_event.buffer[0] ); } tim0 and time1 are set as double. I experience jitter around 1 or 2 beats around the "original bpm set in the master. When master is set to 360 I receive 374. How do you usually fetch the bpm from Midi Clock, any pointer will be welcome. regards hermann

8 years, 6 months

Invitation - Control Chain interface and communication protocol

by Gianfranco Ceccolini

Hi LADs This is an invitation for all those who are interested in the Control Chain system, the MOD approach to external hardware controllers. The Control Chain interface was conceived with the LV2 control ports properties in mind. It tries to dis-abstract the LV2 Control structure in tangible (and material) form. The first purpose of the Control Chain was to connect the MOD and its external peripherals. The MIDI system is very generalistic and we didn’t want to design a “MIDI Clone”. As the LV2 standard enables the developers to add important metadata to describe the Control Ports, the MOD platform makes use of all this info to offer a good user experience to the musicians. A good example is the footswitch. The Control Chain footswitch has built in its firmware different behaviours depending on port properties. It alternates the state of toggles controls, it can trigger an event, it can run the items of an enumeration list and it can also measure time and offer TapTempo for time based units. All this is accomplished with the same physical actuation - the pressing of the button - but according to the control that has been addressed to it. The GUI decides which actuator it offers the user for each of the Controls. The physical interface of the Control Chain devices is an RS-485 full-duplex serial line running at 1Mbit/sec. Currently up to eight devices can be daisy chained and by use of the RJ-45 cable we also power the devices ( 1 pair for input,1 for output and 1 for power supply). After some development we came to the conclusion that such a protocol could be extended for virtual devices in the GUI as well and this would make the development of plugins interfaces much easier. The reason for sharing this with the Linux Audio community is to involve as much people as possible in electing the needed features for the plugins. At this current state, the Control Chain supports only Input ControlPorts. People have been asking about the Tuner and other plugins that have Control Outputs. So we’re opening up the discussion to set the requirements and possibilities that shall be implemented. The discussion is to happen on our mailing list: http://portalmod.com/cgi-bin/mailman/listinfo/developers <http://portalmod.com/cgi-bin/mailman/listinfo/developers> and at the #portalmod IRC channel @ freenode. Hope to see you all there Kind regards Gianfranco The MOD Team

8 years, 6 months

LADSPA::run_adding() anyone?

by Tim Goetze

Good morning lads, among the people still using LADSPA, either directly or wrapped into more fashionable plugin APIs, is anyone actually dependent on run_adding()? (Asking, of course, because I intend to drop support for it.) Thank you, Tim

8 years, 6 months

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Linux-audio-dev November 2014