Linux-audio-dev

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7535 discussions

[LAD] Experience driven design and Linux Audio

by Harry van Haaren

Hi Linux Audio Developers, TL;DR; Discussing experience driven design for linux audio. I'd like to discuss the "age of experiences". Allow me 10 minutes of your time, to watch a video by Aral Balkan talk about development of technology, FLOSS, design, and the future. To start, please watch the following clip: I've skipped into the video to get the section I think is most interesting to discuss on this list: https://www.youtube.com/watch?feature=player_detailpage&v=ldhHkVjLe7A#t=1625 To bring this discussion to a productive start, I'd like to concider the tools we have available as the linux-audio community: they certainly have features, and empower the user to own thier tools, and the data used with those tools. Should we improve experience for users? Should we design "experience driven open" software? Should we forward the UX of Linux Audio to the "age of experiences"? What do users know, that developers might not? What is it that needs to change? Are there even issues here? If so, how do we (the community as a whole) try to solve this? I hope this is a productive and inclusive discussion, and politely request remaining on topic ;) To a fruitful discussion, -Harry -- www.openavproductions.com

11 years, 4 months

Re: [LAD] LV2 Pitch bend control port (and function)

by Harry van Haaren

Hi, When replying, please be careful to reply to the list, as well as the person: otherwise 1/2 a conversation gets lost ;) I've included linux-audio-dev(a)lists.linuxaudio.org again. On Thu, Oct 2, 2014 at 4:13 PM, Phil CM <philcm(a)gnu.org> wrote: > > On 02/10/2014 14:13, Harry van Haaren wrote: >> >> On Thu, Oct 2, 2014 at 1:14 PM, Phil CM <philcm(a)gnu.org> wrote: >>> >>> I need a synth with a pitch control. A synth that can be controlled to >>> produce all tones between one note and another, say from a2 to c3 in an >>> anti-aliased way, like what you would get in pd by altering the pitch of >>> a >>> sine wave. >> >> Hi Phil, >> >> To start, welcome to LV2 programming: audio plugins are fun and complex >> area! > > Thanks :) >> >> >> If you haven't already, I suggest you checkout the "plugins" directory >> in the lv2 repository. It provides the best example code you'll find, >> and accompanying http://lv2plug.in/book/ provides detailed >> explainations and best-practices. > > This is my bedside reading for the next days to come ; Too bad the examples > do not include a simple synth :( That's what I thought too, so I wrote a sin-generator a few years ago: it apparently hasn't been included in the lv2 source yet. I'll CC David Robillard, and see if that's an option :) https://github.com/harryhaaren/lv2/tree/master/plugins/eg-sinsynth.lv2 I remember now that it doesn't accept MIDI input yet: which means it doesn't handle notes, or pitch bend. These can be added quite trivially, and is something that I'd be willing to collaborate on? You'd learn how to "manually" use MIDI, and we'd have a better resource. Please note that the GUI code is NOT something to learn from: its not advised to use GTK for plugin UI's. That said, the code is pretty short, and does actually work: perhaps learn from it, and then use a more lightweight UI framework ( NTK being my / OpenAV's favorite: http://non.tuxfamily.org/wiki/NTK ) > OK, so I'm going to get back once I managed to make a basic synth to get to > this pitch bending special case. Sure, good plan. >> I do strongly advise to checkout the plugins: they are a brilliant >> reference to make LV2 plugins. > > Again, it's really a shame that there is no sound synthesis plugin > demonstrated... I'm going to study them all anyway. >> >> Ok, that's quite a lot of info already I think! >> >> LV2 specific development: >> #lv2 on irc.freenode.net (I'm "HarryHaaren", say Hi if/when you're on) >> Mailing list (low-traffic): >> http://lists.lv2plug.in/listinfo.cgi/devel-lv2plug.in >> >> Cheers, -Harry >> > Thanks a bunch, Harry You're welcome. I like LV2, its the way forward: if I can help out somewhat (apart from developing stuff myself) its also a pleasure, I know LV2 can be a touch daunting, and a helping hand does make it a lot easier there! Cheers, -Harry -- http://www.openavproductions.com

11 years, 4 months

[LAD] [LAU] [LAA] Guitarix 0.31.0 released

by hermann meyer

The Guitarix developers proudly present Guitarix release 0.31.0 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 a bug in the preset naming schema ( vowel mutation in preset names will crash guitarix) and introduce some new LV2 plugs: * GxRoomSimulator * GxDigitalDelay * GxLiveLooper 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> The Guitarix project never accepted Donations, and still wouldn't do. But, if you ever wished to donate the project, I would kindly ask you to back the MOD Kickstarter campaign here: https://www.kickstarter.com/projects/modduo/mod-duo-the-limitless-multi-eff… to reach this Goal: > > If the campaign reaches U$100.000 the MOD Duo will offer an Audio > Interface from it's USB connection. This means that when you plug the > MOD Duo to your computer you will be presented with a 4 input audio > device (two pre-processed + two post-processed) that can be used for > recording the MOD's audio directly to your favorite software. > > Add this to the quality of our analog circuit and you'll have, as a > free bonus, a professional grade audio interface that if bought alone > would cost the price of a MOD Duo. > [*]Here is a list of all included plugs: Guitarix tube emulations ======================== 12ax7 12AU7 12AT7 6DJ8 6C16 6V6 12ax7 feedback 12AU7 feedback 12AT7 feedback 6DJ8 feedback pre 12ax7/ master 6V6 pre 12AU7/ master 6V6 pre 12AT7/ master 6V6 pre 6DJ8/ master 6V6 pre 12ax7/ push-pull 6V6 pre 12AU7/ push-pull 6V6 pre 12AT7/ push pull 6V6 pre 6DJ8/ push-pull 6V6 noamp Guitarix Tonestacks =================== default bassman twin princeton jcm800 jcm2000 mlead m2199 ac30 soldano mesa jtm45 ac15 peavey ibanez roland ampeg ampeg_rev sovtek bogner groove crunch fender_blues fender_default fender_deville gibsen engl Guitarix Cabinets =================== 4x12 2x12 1x12 4x10 2x10 HighGain Twin Bassman Marshall AC-30 Princeton A2 1x15 Mesa Boogie Briliant Vitalize Charisma Guitarix internal mono plugins =============================== Mono : Distortion : JCM 800 Preamp Mono : Distortion : MultiBand Distortion Mono : Distortion : Multi Band Distortion Mono : Distortion : Overdrive Mono : Distortion : Tube Screamer Mono : Echo / Delay : Delay Mono : Echo / Delay : Digital Delay Mono : Echo / Delay : Dubber Mono : Echo / Delay : Duck Delay Mono : Echo / Delay : Echo Mono : Echo / Delay : MultiBand Delay Mono : Echo / Delay : MultiBand Echo Mono : Echo / Delay : ReverseDelay Mono : Guitar Effects : Compressor Mono : Guitar Effects : Crybaby Mono : Guitar Effects : Expander Mono : Guitar Effects : GCB 95 Mono : Guitar Effects : Multi Band Compressor Mono : Misc : abGate Mono : Misc : Detune Mono : Misc : Oscilloscope Mono : Misc : Recorder Mono : Modulation : Chorus Mono Mono : Modulation : Flanger GX Mono : Modulation : Flanger Mono Mono : Modulation : MultiBand Chorus Mono : Modulation : Parametric pitch shifter Mono : Modulation : Phaser Mono Mono : Modulation : Ring Modulator Mono Mono : Modulation : Tremolo Mono : Modulation : Vibe Mono Mono : Reverb : Convolver Mono : Reverb : Freeverb Mono : Tone control : Amp impulse Mono : Tone control : Baxandall Mono : Tone control : BiQuad Filter Mono : Tone control : Cabinet Mono : Tone control : Feedback Mono : Tone control : Fender 6G7 Mono : Tone control : Graphic EQ Mono : Tone control : ImpulseResponse Mono : Tone control : low high pass Mono : Tone control : moonlight Mono : Tone control : Peak EQ Mono : Tone control : Scaleable EQ Mono : Tone control : Tonestack Mono : Tone control : Treble boost Mono : Tone control : Volume Guitarix internal stereo plugins ================================= Stereo : Distortion : Postamp Stereo : Echo / Delay : Digital Stereo Delay Stereo : Echo / Delay : Duck Delay St Stereo : Echo / Delay : Stereo Delay Stereo : Echo / Delay : Stereo Echo Stereo : Guitar Effects : Multi Band Compressor stereo Stereo : Misc : Bass Enhancer Stereo : Misc : Panoram enhancer Stereo : Misc : Stereo Recorder Stereo : Modulation : Chorus Stereo : Modulation : Flanger Stereo : Modulation : Phaser Stereo : Modulation : Ring Modulator Stereo : Modulation : Vibe Stereo : Reverb : Convolver Stereo : Reverb : Plate reverb Stereo : Reverb : Stereo Verb Stereo : Reverb : Zita Rev1 Stereo : Tone control : 3 Band EQ Stereo : Tone control : Moog Filter Guitarix LV 2 plugins ====================== GxAmplifier-X GxAmplifier-Stereo-X GxBarkGraphicEQ GxChorus-Stereo GxCompressor GxDelay-Stereo Gxdetune Gxdigital_delay Gxdigital_delay_st Gxduck_delay Gxduck_delay_st GxEcho-Stereo GxExpander GxFlanger GxFuzz GxGraphicEQ Gxlivelooper GxMultiBandCompressor GxMultiBandDelay GxMultiBandDistortion GxMultiBandEcho GxPhaser GxRedeye Big Chump GxRedeye Chump GxRedeye Vibro Chump GxReverb-Stereo Gxroom_simulator Gxshimmizita Gxstereoecho Gx Alembic Mono Gx Studio Preamp Stereo Gxswitched_tremolo GxTremolo Gxvocoder GxZita_rev1-Stereo GxAutoWah GxWah GxBooster GxEchoCat GxMetalAmp GxMetalHead GxTiltTone GxTubeScreamer GxTubeDelay GxTubeTremelo GxTubeVibrato GxTuner

11 years, 4 months

[LAD] LV2 Pitch bend control port (and function)

by Phil CM

Dear list, I need a synth with a pitch control. A synth that can be controlled to produce all tones between one note and another, say from a2 to c3 in an anti-aliased way, like what you would get in pd by altering the pitch of a sine wave. Touwiiiii. I followed the great "complete idiot" tutorial <http://www.nongnu.org/ll-plugins/lv2pftci/#A_synth> and was really astonished by the concise and powerful code it presented. The results are here <https://bitbucket.org/xaccrocheur/ksi/src/0ffef787ca04?at=master>, I just removed the delay. This is my first steps in C++, or in audio programming altogether (but I've been coding in PHP, Lisp and sh for years, and wrote two music players in JS and HTML, oh and a wrote an ultrabasic sample-based drum machine java applet ages ago) so I'm reading a lot about it currently. Please bear with me if I say something really dumb. In order to understand how I can achieve what I want, I'd like to implement a pitch bend function. You know, the classic, two tone down and up of the physical MIDI keyboards, that all LV2 synth plugins I tried have. For that I guess I need 1-a control port (but no widget, since I would only be controlling it physically) and 2-a function that acts upon the pitch (most probably in the Beep class). I'd also like to change the waveform type from square to sine (and ideally experiment with other waveforms). Can somebody please point me towards the info that would allow me to understand how to do this? I downloaded and built the complete LV2 specifications, and am currently reading the docbook, and the API doc <http://lv2plug.in/ns/lv2core/>, but I fail to see how I can use this object <http://lv2plug.in/ns/lv2core/#PitchPlugin> to alter the pitch, or for example, change the waveform type (that may well be outside the scope of the LV2 framework, of for that matter the LV2::Synth template) or even create other lv2:ControlPort than sliders. Thank you for your patience. -- Phil CM

11 years, 4 months

[LAD] Creative Music Coding lab tonight - 30 sept 2014 - STEIM, Amsterdam

by nescivi

Hiho, tonight is the next edition of the Creative Music Coding lab: We welcome again all creative music coders at STEIM for an evening of exchanging current work, problems and solutions - and music together. More information: http://steim.org/event/creative-music-coding-lab-14/ Entrance is free. And let us know if you plan to join (just to get an idea of how many seats, and how much coffee and tea we should prepare)! sincerely, Marije

11 years, 4 months

[LAD] Audio over net - an observation

by Len Ovens

Focusrite's RedNet series of interfaces uses Dante as the transport protocol. Going to the Dante home page I find that an audio driver (mac/win) is available for $30 or so (there is apparently a linux version available from another party). Yet Focusrite sells a RedNet PCIe card for around $800... one hopes it has more on it than an ethernet port :) That looks like a sound card to the computer. This card does not look like it has a special plug on it (like the locking ones some of the snake/mixing boxes have). I am wondering what other processing might be happening on this card to make it worth Focusrite's effort to produce. Routing to be sure, but the Interface boxes all have that anyway. DSP? Effects? maybe, but not useful on a Linux box I am sure. I realize a big part of the cost is scale (lack of scale in this case), but can't help but think that the money would be better spent on a better mother board. For example moving from an i5/7 to a Xeon based board. Reading more about the RedNet PCIe card. It is 4 lane, but the recomend installing in an 8 lane slot. They also recomend using a GB switch to which both the PCIe audio card as well as the MB native Ethernet port is connected. They are suggesting that all the audio will go through PCIe AI card and that control will go through the native enet port. This all may be to do with 128 channels at 192khz at 3ms. The native enet port has the dante driver on it too. I am not suggesting that the Linux world embrace Dante as a protocol so much as learning from its implementation. I am not sure that building for 192k is the way to go though. Some numbers... if they are talking 192k with a 32sample buffer (like jack with 16/2?) it would seem there is a lot of extra latency built in as at 48k and 16/2 the raw latency from card to jack is only .6ms and at 192k it would be less than .2ms... .3ish for return trip. So the network and ADC together take a lot longer. Considering my USB IF at 48k has an ADC time of ~.5ms, most of that is network. I am looking forward to testing Fons' n2jbridge jack backend. I will not be using 192k however. I generally use 48k, but may try 96k to test differences in latency. My own low level protocol is way down the road, if it ever happens. -- Len Ovens www.ovenwerks.net

11 years, 4 months

[LAD] using libsndfile to write signed short

by Joël Krähemann

Does someone know about writing WAV using libsndfile? My file becomes 174M big as using sf_writef_short() within 8s please take a look at http://ags.sf.net

11 years, 4 months

[LAD] Writing to an eventfd from a realtime thread

by William Light

Hey everybody, I've got this audio app I'm writing which uses message passing to communicate between threads (similar to the actor model). A message channel consists of a ring-buffer for the actual message storage, and then an eventfd so that a thread can block on its channel (or, importantly, several). At the moment, when the audio thread (the JACK callback) needs to send a message over a channel to another thread, it follows the common codepath of appending the message to the channel's ring-buffer and then write()ing to the eventfd. I suspect this is not real-time safe, but is it something I should lose sleep over? -w

11 years, 4 months

[LAD] QMidiArp-0.5.2 released

by Frank Kober

Hi, QMidiArp 0.5.2 has just seen the light of the day. It brings mainly two improvements. One is a comeback, that of tempo changes on the fly, and that now includes also tempo changes of a potential Jack Transport master. Also the Jack Transport starting position is finally taken into account, so that QMidiArp should be in sync also when starting the transport master not at zero. The second one is Non Session Manager support, mainly thanks to the work done by Roy Vegard Ovesen! Note that for compiling in NSM support you will now need liblo as dependency. Enjoy, and enjoy LAC in Graz this year Frank ________________________________ QMidiArp is an advanced MIDI arpeggiator, programmable step sequencer and LFO. Everything is on http://qmidiarp.sourceforge.net qmidiarp-0.5.2 (2013-05-09) New Features o Tempo changes are again possible while running, both manually or by a Jack Transport Master o Jack Transport position is now taken into account when starting, QMidiArp used to start always at zero o Muting and sequencer parameter changes can be deferred to pattern end using a new toolbutton o Modules in the Global Storage window have mute/defer buttons o Global Storage location switches can be set to affect only the pattern o Non Session Manager support with "switch" capability (thanks to Roy Vegard Ovesen) General Changes o NSM support requires liblo development headers (liblo-dev package)

11 years, 4 months

[LAD] [ANN] Super Announcement - All MOD software for your PC

by Gianfranco Ceccolini

Hello Linux Audio Users and Developers In less than an our the MOD Duo Kickstarter campaign will go live and so it is with great pleasure that the MOD Team makes the announcement of the desktop versions for our entire software suite. Some of this software has already been announced in the past but, as part of our Kickstarter campaign, we put the necessary effort to have them running in a regular Linux environment and not just inside the MOD. All instructions in Github were also updated in order to yield working elements when followed. Most of this software has been under development for almost two years and their history is related to the development of the MOD itself. Being so, they carry some differences in workflow when compared to other LV2 programs and our current effort is being put on correcting those differences. The softwares are: MOD Client - run your LV2 plugins using the MOD interface. https://github.com/portalmod/mod-client —————————————————————————————————————————— MOD SDK - plugin interface creator Use this program to create the HTML interface required by the MOD Client. If you don’t create an interface the plugins still work, but their icons will be a tuna fish can with just the ON/OFF button. When you click on the gear symbol on the upper right side of the icon you have access to the Plugin Settings Screen in which all parameters are visible. The MOD SDK is Python based and can be installed by typing “pip install modsdk” As the MOD Client, it runs on your browser and requires a mod-workspace folder (or link) in which you place your LV2 bundles. Just run “modsdk" in your terminal and point your browser to localhost:9000 There is also post on our blog about the SDK: http://portalmod.com/blog/2014/09/the-mod-sdk —————————————————————————————————————————— LV2BM - tool for analyzing and benchmarking LV2 plugins Allows to select which URIs to test Uses minimum, maximum and default control values to run the plugins Uses several controls combinations in the full test mode The output shows the JACK load percent —————————————————————————————————————————— Plugins - CAPS-LV2 LV2 port of the CAPS suite of LADSPA plugins. - TAP-LV2 - LV2 port of the TAP suite of LADSPA plugins. - Pitch shifters - http://github.com/portalmod/mod-pitchshifter Capo - up to 7 semitones up pitch shifting SuperCapo - up to 24 semitones up pitch shifting Drop - up to 12 semitones down pitch shifting SuperWhammy - continuous pitch shifting from -12 to 24 semitones Harmonizer - scale interval generator - Utilities - https://github.com/portalmod/mod-utilities Switchbox - A/B box for audio signal routing SwitchTrigger - 4 excluding channel selector ToggleSwitch - 4 non-excluding channel selector Gain (mono and stereo) Filters (LP, HP and BP) - 1st, 2nd and 3rd order Two way mono crossover - 1st, 2nd and 3rd order Three way mono crossover - 1st, 2nd and 3rd order - Distortions - mathematical simulations of classic distortion circuits BigMuff DS-1 Muff Fuzz - SopoperLooper LV2 simplified port of the SooperLooper. All plugins from our repository have the HTML MOD GUI included. In our Github repository - www.github.com/portalmod - we also have plugins that were forked from the original repositories. One of our aims is to trigger a dialogue with the developers, deprecate our forks and add the MOD interface to the original plugins but that depends on the developers and creators and shall be discussed in a one-to-one basis. Wish you all the best Kind regards Gianfranco The MOD Team

11 years, 4 months

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Linux-audio-dev