Linux-audio-dev September 2017

linux-audio-dev@lists.linuxaudio.org

17 participants
11 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

6 years, 2 months

Jitter analysis

by benravin

Hi, I'm facing a timing jitter which happens periodically due to some interrupt, which is causing the task to be delayed. Since this happens periodically, it is indeed a slow varying timing jitter, for example every 400ms, the timing deviation is in the order of few ms ( 4-6ms). This is not getting filtered out by DLL, and results in a slow varying oscillations which never dies. Any way to identify and limit these timing jitters and not to take any action on drift correction by DLL ? -ben -- Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-dev-f58952.html

7 years, 2 months

spectmorph-0.3.4

by Stefan Westerfeld

spectmorph-0.3.4 has been released. Overview of Changes in spectmorph-0.3.4: ---------------------------------------- * Added optional ADSR Envelope * Make LV2 and VST plugin stereo to allow supporting stereo in the future * LV2 plugin description fixes * Added about dialog to plugin/smjack UI * Remove BEAST plugin (plugin code will be moved to BEAST) * Fixed compilation for newer g++ >= 6 (std::fabs) * Get rid of some malloc() calls in linear morphing What is SpectMorph? ------------------- SpectMorph is a free software project which allows to analyze samples of musical instruments, and to combine them (morphing). It can be used to construct hybrid sounds, for instance a sound between a trumpet and a flute; or smooth transitions, for instance a sound that starts as a trumpet and then gradually changes to a flute. SpectMorph ships with many ready-to-use instruments which can be combined using morphing. SpectMorph is implemented in C++ and licensed under the GNU LGPL version 3 Integrating SpectMorph into your Work ------------------------------------- In order to make music that contains SpectMorph, you currently need to use Linux. There are four ways of integrating SpectMorph sounds into music you create: - LV2 Plugin, for any sequencer that supports it. - VST Plugin, especially for proprietary solutions that don't support LV2. - JACK Client. - BEAST Module, integrating into BEASTs modular environment. Note that at this point, we may still change the way sound synthesis works, so newer versions of SpectMorph may sound (slightly) different than the current version. Links: ------ Website: http://www.spectmorph.org Download: http://www.spectmorph.org/downloads/spectmorph-0.3.4.tar.bz2 There are many audio demos on the website, which demonstrate morphing between instruments. -- Stefan Westerfeld, Hamburg/Germany, http://space.twc.de/~stefan

7 years, 2 months

[ANN] Qtractor 0.8.4 - End of Summer'17 release!

by Rui Nuno Capela

Yes, it's been like clockwork... Every two months or so, you stumbled with a brand new dot release, code-named after some of the same adjective-plus-noun (or vice versa) code-names. You knew the thrill and yet it lands no more. First, the code-naming joke has been just a parody--or was it the other way around?--to some well known Linux-distro 'alimalistic' code-name series. Then on it got rogue into some directed puns--remember the date when BitWig Studio 1.0 was first released? Yeah, the "Byte Bald" was there for the pun, on the very same day :) Well, that's all gone by now. Northern hemisphere seasons are the new norm and that's about two main reasons: first, it's where I live; second, due to an undeniable global warming effect pervading the globe, all geographical temperate zones are simply on the edge of extinction. More or less in a couple of decades or so. For the sake of brevity, I will just leave it like paying homage to those natural concepts that are facing an inexorable fate. And yet, there're still the good news: Qtractor 0.8.4 (end of summer'17) released! Change-log: - Assigned MIDI Controllers to plug-in's Activate switch are now finally saved and (re)loaded properly across sessions. - Audio clip panning option property is now being introduced. - Out-of-process (aka. dummy) VST plug-in inventory scanning now restarts automatically and resumes processing in case of a premature exit/crash; VST plug-in inventory scan/cache persistency is now in place. - Desktop entry specification file is now finally independent from build/configure template chains. - Updated target path for freedesktop.org's AppStream metainfo file (formerly AppData). - Changing the View/Options.../Display/Custom/Style theme takes effect immediately unless it's back to "(default)". - Slightly slower but better approximation to IEEE 32bit floating point cubic root ie. cbrtf(). Description: Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: http://qtractor.org http://qtractor.sourceforge.net https://qtractor.sourceforge.io Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://download.sf.net/qtractor/qtractor-0.8.4.tar.gz - source package: http://download.sf.net/qtractor/qtractor-0.8.4-32.rncbc.suse.src.rpm - binary packages (openSUSE Tubleweed): http://download.sf.net/qtractor/qtractor-0.8.4-32.rncbc.suse.i586.rpm http://download.sf.net/qtractor/qtractor-0.8.4-32.rncbc.suse.x86_84.rpm - AppImage [7] packages: http://download.sf.net/qtractor/qtractor-0.8.4-2.i686.AppImage http://download.sf.net/qtractor/qtractor-0.8.4-2.x86_64.AppImage Git repos: http://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor.git https://gitlab.com/rncbc/qtractor.git https://bitbucket.org/rncbc/qtractor.git Wiki (help wanted!): http://sourceforge.net/p/qtractor/wiki/ - static rendering: http://qtractor.org/doc http://qtractor.sourceforge.net/doc - user manual & how-to's: http://download.sf.net/qtractor/qtractor-manual-and-howtos.epub http://download.sf.net/qtractor/qtractor-manual-and-howtos.pdf License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.sourceforge.net http://qtractor.org [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [6] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [7] AppImage, Linux apps that run anywhere http://appimage.org/ See also: http://www.rncbc.org/drupal/node/1851 Enjoy && Keep having fun. -- rncbc aka Rui Nuno Capela

7 years, 3 months

Fedora 25 x86_64; Pulseaudio removed; ALSA recording and playing from multiple sources - JACK?

by Philip Rhoades

People, For playing from multiple sources, ALSA plus the version of .asoundrc below has been rock-solid for a couple of years now: I now want to use things like "recordmydesktop" which work fine with the mic but they do not record sound from audio or video clips that are playing eg from YouTube or local mpv etc. So, yet again, I started to try and make sense of JACK because I was pretty sure that it could solve this problem - but I have found sound on linux has always been a major pain and messing around with configs and rebooting etc on my big workstation is tedious so I think I will try to get something working on my laptop to begin with. Hopefully some jack gurus will have some suggestions about how to do what I want to do? I presume it is possible? Thanks, Phil. pcm.!default { type plug slave.pcm "asymed" } # This is the audio output: pcm.dmixer { type dmix ipc_key 1024 slave { pcm "hw:1,0" period_time 0 period_size 1024 buffer_size 4096 rate 44100 } bindings { 0 0 1 1 } } ctl.dmixer { type hw card 0 } # This is the microphone pcm.dsnooped { ipc_key 1027 type dsnoop slave.pcm "hw:1,0" } # This makes both channels work together. pcm.asymed { type asym playback.pcm "dmixer" capture.pcm "dsnooped" } -- Philip Rhoades PO Box 896 Cowra NSW 2794 Australia E-mail: phil(a)pricom.com.au

7 years, 3 months

Could not open ALSA sequencer as a client. ALSA MIDI patchbay will be not available.

by benravin

Hi, I'm using JACK version jackdmp 1.9.11-RC1, whenever I start the JACK server i get the subject line error message. I execute the following command. $sudo modprobe snd-seq-midi Is there a way to set this permanently and no need to execute every time i start JACK ? -ben -- Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-dev-f58952.html

7 years, 3 months

Jack buffer requirements

by benravin

I want to know the optimal buffering which i can use for designing my application. My use case is as follows, I receive digital radio signals through a tuner and does the channel and audio decoding in separate threads. Finally the audio is send to jack callback and played out. How much of buffering is enough for real time streaming between threads. I want keep the optimal buffering between these threads. Please suggest guidelines for using with Jack. -ben -- Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-dev-f58952.html

7 years, 3 months

Drift compensation document

by Benny Alexandar

Hi All, This is my first post to Linux Audio. I had a look at alsa_in/out programs, and the man page says it performs drift compensation for drift between the two clocks. I would like to know more about the implementation details such as the drift compensation using PI controller. Any paper/presentation documents available other than the C code. Please share me the details. -ben

7 years, 3 months

sourceforge?

by Will Godfrey

Anyone else having problems pushing commits there? It was fine yesterday, but today I get an instant refusal. No problems with github. -- 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.

7 years, 3 months

DSP transients

by Will Godfrey

Does anyone know of software that can log these without significantly adding to the load itself? -- 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.

7 years, 3 months

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Linux-audio-dev September 2017