- chuck-dev - lists.cs.princeton.edu

Event chugin
by Emery Hemingway 19 Nov '16

19 Nov '16

Hello list, I would like extend ChucK with a chugin that implements a custom event class, but I can only find UGen generators. Is it possible to do such a thing? A more obvious choice seemed to be to send OSC events from another process, but I would prefer a plugin so that everything can be configured from ChucK, rather than in ChucK, the external component, then the routing between the two. The events are not from human input and carry a string payload, so I don't think I can practically map them to existing event classes. Cheers, Emery

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Seeking Chuck Developer
by MediMuse 07 Mar '16

07 Mar '16

Seeking ChucK => programmer For bio-metric data Sonification project. Please state your interest in this effort and provide ChucK dev and/or UI history to: medimuse(a)alumni.stanford.edu

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Reasonability of Chuck interoperating with VST hosts?
by mviljamaa 18 Dec '15

18 Dec '15

What's the reasonability of having (or making) Chuck interoperate with typical VST hosts? E.g. having Chuck run as a VST or being able to write VST plug-ins by using "Chuck API" in conjunction with some VST SDK? -Matti

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Concrète Mixer - ChucK based Pi app
by stuartcmcd . 25 Sep '15

25 Sep '15

Hi sometime last year I asked for permission to distribute a compiled ChucK binary with an app I was developing. It took a while for me to get my act together, but it's ready now. The program is called Concrète Mixer and is intended as a sound file mixer with an effects chain, with parameters as free as possible so that no two iterations of the playback are the same. The user supplies audio files (field recordings, advertising jingles, whatever seems to work), and the program pumps them through an effects chain and periodically chops them up. Concrète Mixer is designed to run on a Raspberry Pi. It didn't run convincingly on the first generation of Pis, but the Pi 2 has allowed 44kHz playback with plenty of headroom. The app has a repeat mode so it can perform as many iterations as the listener's sanity will allow. The software is very much a 'my first ChucK project' and pretty simple, but if the idea of an open-ended sound altering and colouring program interests you, you can check out the code at https://github.com/concrete-mixer/concrete-mixer or have a listen to demo tracks at: https://concrete-mixer.bandcamp.com. Finally, thanks to the ChucK devs for making this project possible! Stuart

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On SinOsc, Wavetables, Unit Circles, etc.
by Perry Cook 18 Sep '15

18 Sep '15

Hey all, Chiming in on the various Sine-related topics here. SinOsc was designed like most of ChucK, to do things from the definition, without particular regard for efficiencies. In fact, a native Math.sin(BLAH) call isn’t that hideous. It used to be in the olden days, and we avoided it like the plague. The Motorola DSP 56000 had a built in quarter-wave of sine in ROM. (It also had an 8-bit muLaw decoding table built in as well). Many papers (Snell, Others) were written about the optimal length, bit-depth, etc of a sine table given different types of interpolation. Yamaha chips stored sine quads in both linear (for addition) and log (for multiplication) ROM, or hard-coded into gates for the absolute minimum expense. Wavetables: Indeed, SndBuf is ChucK’s built-in wavetable (in .loop mode). And, it could be a little cheaper, and it has built-in linear interpolation. If you want less distortion, just make your table longer. The “table” here is a .wav file you create and load. All you need add is an accessing function to set rate as a function of frequency. And you could also add FM, PM, and other .sync-like functions as well. By this time, it might be worth comparing to SinOsc efficiency for FM and other audio- rate modulation tho. I just did a quick check and find SndBuf to be about equal to SinOsc (the number I can run before audio starts breaking up, just over 400). See code below. Note also that there are some other wavetable-like UGens already in the GenX family in ChucK. I don’t know about the relative efficiency of those, and I do know that that you need to drive (some of) them with a Phasor. So again, it might not end up being significantly cheap. On unit-circle sine generation: Spencer has already given us a great ChuGen called MagicSine, that does the rotation-based sine generation using only a couple of multiplies and adds. It’s most efficient if you’re not changing frequency rapidly. Julius and I also did a “waveguide resonator” oscillator (similar to Magic Sine), but it also had built in exponential envelope (phasor that spins outward or inward), and allowed for modulation of the parameters for FM-like wave distortion. Not particularly efficient if you just want a sine wave. I have a ChuGen for that too, but never released it. So the topic "many ways to skin a sine" is still active today!! My comparison codes (in terminal, miniAudicle may vary, also Audio BUFSIZE might help): /* SinOscCompare.ck ***************************************/ SinOsc s[1000]; Gain outMix => dac; for (int i; i < 4000; i++) { if (i%100 == 0) <<< "Sines", i+1 >>>; // this could be costing us some s[i] => outMix; Math.random2f(100,3000) => s[i].freq; // as would this 1.0/(i+1.0) => outMix.gain; // and this 10*ms => now; // but if those dominated, we’d probably hear 100 Hz distortion } vs. /* SndBufCompare.ck ***************************************/ SndBuf s[1000]; Gain outMix => dac; for (int i; i < 4000; i++) { if (i%100 == 0) <<< "SndBufs", i+1 >>>; // this could be costing us some "special:dope" => s[i].read; // maybe this too, but cacheing should help 1 => s[i].loop; s[i] => outMix; Math.random2f(0.2,5.0) => s[i].rate; // as would this 1.0/(i+1.0) => outMix.gain; // and this 10*ms => now; // but if those dominated, we’d probably hear 100 Hz distortion }

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SinOsc calculations
by Joel Matthys 18 Sep '15

18 Sep '15

Hello! I was looking through the source recently, and I was a little surprised to find that the SinOsc UGen performs a trig function every sample. I was under the impression that most osc implementations use a lookup table with interpolation because it's considerably more efficient. Was this a specific design decision? Would there be support for revising SinOsc for efficiency if the audible result was indistinguishable? Thanks, Joel

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Jack + ChucK => oodles of error messages
by Daniel Chapiro 09 Aug '15

09 Aug '15

Hi - I hope someone has run into this before. After I installed Jack (to use with Faust, not with Chuck), each time that Chuck runs, it issues a bunch of error messages. If Jack is running, the list of errors is several pages long. If Jack is not running, I get: JAR: Blacklisted client Xquartz JAR: Blacklisted client Terminal JAR: Blacklisted client loginwindow JAR: Blacklisted client Xcode JAR: Blacklisted client SystemUIServer Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started JAR: jack server not running or rejected client In either case ChucK seems to run OK. Is this a bug, or is there something that I can do to avoid these messages? Thanks! Daniel

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ChucK tests fail
by Arve Knudsen 12 Jul '15

12 Jul '15

Currently, a number of ChucK tests are failing, both on Linux (44 <https://travis-ci.org/ccrma/chuck/jobs/69237649> according to Travis build) and OS X (8 tests for me). Does anyone have a handle on what can be done about this? I'm having issues compiling Chuck to JavaScript (via Emscripten) due to memory access bugs, and I wonder if this is related to these test failures. Thanks, Arve

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OpenBSD
by Cédric Krier 24 Jun '15

24 Jun '15

Hi, Just to say that I updated the OpenBSD patch to the latest version of ChucK: http://www.b2ck.com/~ced/chuck-1.3.5.1-openbsd.patch It uses the OSS API but it is still missing the midi and hid support. Regards, -- Cédric Krier

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Where is the stack depth of user-defined functions determined?
by Arve Knudsen 22 Sep '14

22 Sep '14

Hi I need to determine where the stack depth of user defined functions (i.e. Chuck_VM_Code::stack_depth) is determined, but haven't succeeded in doing so myself yet. Could someone please point it out for me? Thanks, Arve

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