Linux-audio-dev April 2015

linux-audio-dev@lists.linuxaudio.org

60 participants
33 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

5 years, 6 months

Call for testing: new ALSA driver for Digi 002/003 family

by Takashi Sakamoto

Hi all, This is a call-for-testing of my new ALSA driver for Digidesign 002/003 family. If you have these devices, would you please test the driver with your devices and report your experience about it. Especially, I want you to test MIDI port for machine control, because developers have no 'console' models, just tested with 'rack' models. When installing and testing, please follow this instructions: https://github.com/takaswie/snd-firewire-improve Patchset was already posted to alsa-devel and confirmed to playback/capture PCM samples/MIDI messages by ALSA applications. [alsa-devel] [RFC v2][PATCH 00/11] digi00x: new driver for Digidesign 002/003 family http://mailman.alsa-project.org/pipermail/alsa-devel/2015-March/089708.html Several issues are still remained: * The port for MIDI machine control message is not tested yet, because 002/003 console model are required. * When allocates 2 or more channel numbers for the device, after 15 to 20 seconds from playbacking, any PCM samples causes noisy sound. Then, all of LED on the front panel light. The streaming still continues correctly. * The actual effects of external clock source is not clear. When set the clock source is somewhat external, even if stopping the clock source, the device continues to sound PCM samples against my expectation. * The meaning of asynchronous messages is unknown. This patchset adds a functionality to receive it in userspace. You can test it with updated libhinawa sample script. https://github.com/takaswie/libhinawa In my plan, this patchset will proposed for Linux 4.2. But these issues need to be clear till the merge-window. Regards Takashi Sakamoto

8 years, 10 months

A couple of new plugins

by Hermann Meyer

been pushed to the guitarix git repository. Those are simulations of the following pedals: Fuzz Face JH1 Fuzz Face Fuller Mods Fuzz Face Roger Mayer Foxey Lady Colorsound Tonebender Sustainer+Muff (Big Muff Pi) Screamig Bird Hornet High Frequency Brightener LPB-1 Booster Hogs Foot They are generated from schematic files, with our Ampsim Toolkit. http://sourceforge.net/p/guitarix/blog/2015/03/j-hendrix-fuzz-face/ Schematic files (gschem) been included in the tools directory. regards hermann

8 years, 10 months

JACK and vanilla 3.19.2 startup issue

by Harry van Haaren

Hi All, As root, starting JACK1 0.124.1 on an almost totally vanilla 3.19.2-1-ARCH kernel fails. Output of kernel with JACK1 issue is pasted below[1]. The same system works fine with the 3.18.9-rt5-1-rt kernel. Running "groups" tells me there is no group other than "root", so JACK seems to misinterpret that there is an audio group on the "broken" kernel. Any suggestions as to what's going on? Thanks, -Harry PS: I'm aware of the reasons to not run JACK as the root user or login as root for daily use. [1] Output while running "broken" kernel: [root@audio ~]# jackd -ddummy jackd 0.124.1 Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK is running in realtime mode, but you are not allowed to use realtime scheduling. Your system has an audio group, but you are not a member of it. Please add yourself to the audio group by executing (as root): usermod -a -G audio (null) After applying these changes, please re-login in order for them to take effect. You don't appear to have a sane system configuration. It is very likely that you encounter xruns. Please apply all the above mentioned changes and start jack again!

8 years, 10 months

mixing music and sound effects using libao

by dave＠661.org

I've been playing around with libsndfile, libvorbisfile, libmodplug, and libao to provide background music and sound effects for a game engine. I have a solid handle on making one noise at a time, but I don't understand mixing. At first I thought I would have to write my own mixer and handle the channels, sample rate, and sample size issues myself. I really don't want to have to do that. Then I noticed in the libao documentation that nothing says that I cannot spawn two threads, each of which calls ao_open_live() and ao_play() on different sound files. Indeed, the docs for ao_initialize() seem to suggest this can be done with the statement that it be called in the main thread. I tried this and it works so erratically that I'm not sure libao was written with this in mind. I get these results in order of likelihood: 1) "Segmentation fault" 2) "*** glibc detected *** ./threadtest7: malloc(): memory corruption (fast): 0x0000000001bc5390 *** Bus error" 3) "*** glibc detected *** ./threadtest7: double free or corruption (out): 0x00000000018ba2e0 ***" 4) A bit of the first file, then the second file. 5) Only the second file. 6) Both files messily mixed with a zipping noise. (very rare) Is libao in fact intentionally capable of doing this? If not, what are my options for mixing music and sound effects? I really don't want to use SDL_mixer for a variety of reasons, chiefly because my program is terminal-only. Virtual beer if you can guess what the program is. -- David Griffith dave(a)661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

8 years, 12 months

[ANN] Vee One Suite 0.6.2 - A fifth beta release

by Rui Nuno Capela

Howdy, The 'Vee One Suite' of 'old-school' software instruments, aka. the 'gang of three' have bumped over another tiny notch: synthv1 [1], as one polyphonic synthesizer, samplv1 [2], a polyphonic sampler and drumkv1 [3], as one drum-kit sampler, are now being released to the masses. Again ;) There's no big audible changes, if any at all, yet this fifth beta release is rather a probale bug fix drumkv1 LV2 on Ardour. Anyway, it's all gone as follows: - Sample file path mapping has been fixed for LV2 plugin state restoration, which were preventing Ardour to reload any of the saved session or preset sample files in particular (re. drumkv1 only). - Custom knob/dial behavior mode options are now introduced: linear and angular (aka. radial) as far to avoid abrupt changes on first mouse click (still the default behavior). - Fixed for some strict tests for Qt4 vs. Qt5 configure builds. We're still available in dual form, as business as usual: - a pure stand-alone JACK [4] client with JACK-session, NSM [5] (Non Session management) and both JACK MIDI and ALSA [6] MIDI input support; - a LV2 [7] instrument plug-in. Enough to tell, the Vee One Suite are free and open-source Linux Audio software, distributed under the terms of the GNU General Public License (GPL) [8] version 2 or later. As always, have (lots of) fun :) **synthv1 - an old-school polyphonic synthesizer [1]** synthv1 0.6.2 (fifth official beta) is now released! synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: http://synthv1.sourceforge.net downloads: http://sourceforge.net/projects/synthv1/files - source tarball: http://download.sourceforge.net/synthv1/synthv1-0.6.2.tar.gz - source package: http://download.sourceforge.net/synthv1/synthv1-0.6.2-21.rncbc.suse132.src.… - binary packages: http://download.sourceforge.net/synthv1/synthv1-0.6.2-21.rncbc.suse132.i586… http://download.sourceforge.net/synthv1/synthv1-0.6.2-21.rncbc.suse132.x86_… **samplv1 - an old-school polyphonic sampler [2]** samplv1 0.6.2 (fifth official beta) is now released! samplv1 is an old-school polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: http://samplv1.sourceforge.net downloads: http://sourceforge.net/projects/samplv1/files - source tarball: http://download.sourceforge.net/samplv1/samplv1-0.6.2.tar.gz - source package: http://download.sourceforge.net/samplv1/samplv1-0.6.2-21.rncbc.suse132.src.… - binary packages: http://download.sourceforge.net/samplv1/samplv1-0.6.2-21.rncbc.suse132.i586… http://download.sourceforge.net/samplv1/samplv1-0.6.2-21.rncbc.suse132.x86_… **drumkv1 - an old-school drum-kit sampler [3]** drumkv1 0.6.2 (fifth official beta) is now released! drumkv1 is an old-school drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net/lv2 website: http://drumkv1.sourceforge.net downloads: http://sourceforge.net/projects/drumkv1/files - source tarball: http://download.sourceforge.net/drumkv1/drumkv1-0.6.2.tar.gz - source package: http://download.sourceforge.net/drumkv1/drumkv1-0.6.2-17.rncbc.suse132.src.… - binary packages: http://download.sourceforge.net/drumkv1/drumkv1-0.6.2-17.rncbc.suse132.i586… http://download.sourceforge.net/drumkv1/drumkv1-0.6.2-17.rncbc.suse132.x86_… References: [1] synthv1 - an old-school polyphonic synthesizer http://synthv1.sourceforge.net/ [2] samplv1 - an old-school polyphonic sampler http://samplv1.sourceforge.net/ [3] drumkv1 - an old-school drum-kit sampler http://drumkv1.sourceforge.net/ [4] JACK Audio Connection Kit http://jackaudio.org/ [5] NSM, Non Session Management http://non.tuxfamily.org/nsm/ [6] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [7] LV2, Audio Plugin Standard, the extensible successor of LADSPA http://lv2plug.in/ [8] GNU General Public License http://www.gnu.org/copyleft/gpl.html See also: http://www.rncbc.org/drupal/node/886 Enjoy && keep the fun ;) -- rncbc aka. Rui Nuno Capela

8 years, 12 months

GuitarSynth now as lv2/vst ..

by Gerald

Hi The lv2 version of GuitarSynth is working, thanks to falktx's DPF. Get it from https://github.com/geraldmwangi/GuitarSynth-DPF.git if you like. I'll release (post to LAU) it with bugfixes on the weekend. Lg Gerald

8 years, 12 months

GuitarSynth

by Gerald

Hi guys, I've started/hacked a small project called GuitarSynth. It is meant as a playfield for exploring pitchdetection and synthesis for Guitar, since I'm a guitarist. You can get on Github (git clone https://github.com/geraldmwangi/GuitarSynth.git). Its really basic but its fun to play with. It take an audio signal (your guitar) extracts the fundamental pitch and drives some wavetable synths. Feel free to manipulate it, I'll be happy to grant people write access to the repo. Btw on IRC my Nick is JimsonDrift, the name of my band (see www.jimson-drift.de). Cheers Gerald

8 years, 12 months

User eXperience in Linux Audio

by Harry van Haaren

Hi All, As promised just at the closing ceremony of LAC, an email opening the discussion of User Experience on Linux Audio. To all Developers, please use this as a checklist and consider supporting each item. It will improve the user experience. 1: Splash Screen If an app takes more than one quarter of a second to open, use a splash screen to give feedback. Feel free to contact me directly to collaborate on a splash screen graphic if necessary. Ensure the splash is shown immediately, before lengthy operations such as scanning for files or loading content. 2: Presets Synths and Effect plugins often provide presets - show a preset selection "in" the main UI, or 1 click away. A fast way to browse presets greatly enhances UX when searching for a sound. Ideally support "scroll-wheel" interaction for changing presets. 3: Hotkeys - Ctrl Q, Quit - Ctrl W, Close Project - Ctrl S, Save - Ctrl Shift S, Save As - Escape, Context sensitive "close" I'm aware most of the recommendations above are obvious, and that many programs support these already. Cheers, -Harry -- http://www.openavproductions.com

9 years

Re: [LAD] User eXperience in Linux Audio

by Kjetil Matheussen

"Tim E. Real": > > 6: Now turn the mouse pointer back on. Done. > > Ehm, missed on of the best parts: > 6: Now return the mouse pointer to where it was when originally clicked. > 7: Now turn the mouse pointer back on. Done. > > Sounds like the perfect way to do it, and Radium works exactly the same way: http://folk.uio.no/ksvalast/radiummouse.webm (that's a 60fps video. Firefox doesn't seem to display 60fps videos correctly. Chrome does though) :-)

9 years

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Linux-audio-dev April 2015