July 2012 - chuck-users - lists.cs.princeton.edu

Time doubt...
by John Gamboa 01 Aug '12

01 Aug '12

Hello Chuckist... I'm relatively new to Chuck -- although I've already used it some time ago -- and I have a doubt about how the time works in the VM. I was reading the Ge's PhD Thesis and I found this part: A ChucK shred must voluntarily relinquish the processor for other shreds to > run (In this they are like non-preemptive threads). [...] Shreds, by > design, > directly use ChucK’s timing mechanism: when a shred advances time or waits > for an event, it is, in effect, shreduled by the shreduler (which > interacts with > the audio engine), and relinquishes the processor. This is powerful in that > it can naturally synchronize shreds to each other by time, without using > any > traditional synchronization primitives. > My question is: if two threads try to change the same variable at the same time ("rounded" to the nearest sample), what is the expected behavior of the program? I tried to take a look at the code of the VM, but I couldn't understand exactly what would happen at that point D=. I imagine that the occurrence of such event is very unlikely (there are "a lot" of samples in one second), but supposing that the computation in Chuck really takes "no time" to happen (as the thesis often reforced), I believe it would happen soon or later. Anyway, I have right now [at least some] interest at how the shreduler works, so I'm possibly gonna spend some time trying to understand exactly what happens at that file. If you have some tip on where I should start, it would make me very happy =) -- John Gamboa rabanetescebolas.blogspot.com

3 3

Mixing recorded Voice with some music theme
by sunny chaudhary 01 Aug '12

01 Aug '12

Hi, I am new to this technology. I want to do some media processing on static file. I want to mix the recorded human voice with some music. The voice should time stretch and pitch stretch, pitch shift as per the music frequency. Totally want to merge sound with music. So when listening to the final output, it produces voice playing as per the flow of music. Any idea how to achieve this? Is CHUCK is the right tool for achieving this? I need this functionality on urgent basis. We can pay for the solution. Regards, Sunny

3 3

emacs mode?
by plutek 30 Jul '12

30 Jul '12

greetings! just getting (back!) into ChucK, and my fingers are hard-coded to emacs keybindings.... i'm seeing references to various emacs major-modes for ChucK, but all look old-ish and it's hard to tell which might be best suited for Dracula 1.2.1.3. any recommendations would be much appreciated! thanks in advance... cheers! .pltk.

2 1

dynamic array crashes for "int ar[]" but not "int ar[0]"
by George Locke 28 Jul '12

28 Jul '12

Hi, array.size(int) and the '<<' operator are crashing miniAudicle (version 0.2.0, on Windows 7 pro). (functionality added to chuck in 1.2.1.2, http://chuck.cs.princeton.edu/release/VERSIONS ). miniAudicle tells me it's running chuck 1.2.1.2. the following code produces a "NullPointerException" error int ar[]; ar.size(10); // crashes here, "NullPointerException: shred[id=1:*unnamed3], PC=[5]" for (0 => int i; i < 4; i++) { ar << i; // crashes here, "NullPointerException: (array append) in shred[id=1:*unnamed3], PC=[13]" } playing around a bit, I now find that if I follow what the example array_dynamic.ck says and replace "int ar[]" with "int ar[0]", then the code works. I guess that means this isn't a bug but a meaningful difference between ar[] and ar[0]? In any case, I might amend the array_dynamic.ck to say something like "float argh[0]; // must set argh[0] and not argh[]" Thanks again, George On Fri, Jul 27, 2012 at 12:44 PM, George Locke < george.locke.maxmsp(a)gmail.com> wrote: > thanks! > > > On Fri, Jul 27, 2012 at 10:31 AM, Julien Saint-Martin < > julien.saintmartin(a)googlemail.com> wrote: > >> Hi George, >> >> You can check examples in Chuck installation directory: \examples\array\ >> array_resize.ck and array_dynamic.ck >> Personally I use: >> array.size(new_size); >> or >> array << new_element; // to add an element. >> >> Happy chucking, >> Julien >> >> >> 2012/7/27 George Locke <george.locke.maxmsp(a)gmail.com> >> >>> Hi, >>> >>> I am creating an array, but i don't know how big I need it to be at the >>> time it is instantiated. Once I figure out what I want that size to be, >>> how do I assign it? The current solution i have is this: >>> >>> int array[]; >>> int size; >>> // do stuff >>> { // new block keeps dummy from clogging namespace >>> int dummy[size]; >>> dummy @=> array; >>> } >>> >>> Is there a better way? >>> >>> Regards, >>> George >>> >>> _______________________________________________ >>> chuck-users mailing list >>> chuck-users(a)lists.cs.princeton.edu >>> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users >>> >>> >> >> _______________________________________________ >> chuck-users mailing list >> chuck-users(a)lists.cs.princeton.edu >> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users >> >> >

2 3

how best to resize array?
by George Locke 27 Jul '12

27 Jul '12

Hi, I am creating an array, but i don't know how big I need it to be at the time it is instantiated. Once I figure out what I want that size to be, how do I assign it? The current solution i have is this: int array[]; int size; // do stuff { // new block keeps dummy from clogging namespace int dummy[size]; dummy @=> array; } Is there a better way? Regards, George

3 3

reset namespace in miniAudicle
by George Locke 27 Jul '12

27 Jul '12

Hi, I'm writing up a class, and I can't seem to test the changes I make to it without restarting miniAudicle. The problem is that I get "class/type 'myClass' is already defined in namespace 'global'" errors when I "add shred" in the window defining the class. Any help? Regards, George

2 2

first query to chuck users
by Carr Everbach 24 Jul '12

24 Jul '12

I'm a Swarthmore College Engineering professor trying to help a blind student with data sonification (or auralization). It was suggested that Matlab, which is our primary analysis language, could send OSC packets via UDP to chuck, which reads OSC packets and could more easily produce complex sounds than coding directly in Matlab. Do any of you have any experience with osc-mexwin, written by Andy Schmeder? The only version of this I've found lacks the c-code, and contains only the dll files without documentation. Matlab requires that the user know the function names to import dll files and use those functions (such as osc_read and osc_write). Any guidance?

4 3

TES - special session on participatory electronic ensemble performance
by David Ogborn 20 Jul '12

20 Jul '12

Dear friends, For the Toronto Electroacoustic Symposium 2012 (Aug 15-18 2012) I am again curating a special session on participatory electronic ensemble performance (PEEP) - such as laptop orchestras, live coding groups, telematic improvisation sessions, and other collective electroacoustic forms. I am writing to you now to invite proposals for compositions, instruments, experiments and other activities that might be included in the session. I see this taking shape in an "unconference" kind of way where I will endeavour to include as many of the submitted ideas as possible, taking into account the available time, human and technical resources. The laptop orchestra I direct at McMaster University (the Cybernetic Orchestra) will be at the session ready to perform with selected materials (i.e. we'll be devoting our remaining rehearsals in July and August to preparing for the session). The orchestra is willing to try anything. Live coding with ChucK is the orchestra's core strength - with pockets within the orchestra developing strong skills with MaxMSP and SuperCollider. But I repeat: we are willing to try anything! Feel free to make proposals involving other performers at the symposium, symposium attendees, and the general public also. So… if you are involved with participatory electronic ensemble performance in any form (or know people who are) - please consider sending me (or encouraging someone else to send me) a proposal. Proposals should be sent to me at ogbornd(a)mcmaster.ca in plain-text email. Thanks in advance for forwarding this - I look forward to hearing from many of you! Deadline for proposals: Tuesday 31 July 2012 Toronto Electroacoustic Symposium: 15-18 August 2012 Participatory Electronic Ensemble Performance Session: 2-4 PM on Saturday 18 August 2012 Yours truly, David Ogborn The Cybernetic Orchestra -- http://esp.mcmaster.ca TES 2012 -- http://cec.sonus.ca/events/TES/2012 and http://www.naisa.ca/soundtravels/symposium.html ------------------------------------------------------------------- Dr. David Ogborn, Assistant Professor Communication Studies & Multimedia Director, Cybernetic Orchestra & ESP Studio McMaster University, Hamilton, Canada ogbornd --at-- mcmaster.ca http://davidogborn.net http://twitter.com/ogbornd http://esp.mcmaster.ca (Cybernetic Orchestra) 1-905-525-9140 ext 27603

1 0

interpolated step? (equivalent to max's line)
by George Locke 13 Jul '12

13 Jul '12

Hi, I still feel new to chuck, and I'm wondering if there's a UGen that will make a (linear/whatever) ramp from its current value to a specified new value over a specified time? Might there be a way to hack the GenX or Envelope objects to behave this way? (For ppl familiar with max/msp, I'm looking for something equivalent to line~) I want to use this for modulation and for slewing controller input. Since the timescale i'm interested is on the scale of seconds/fractions of seconds, I suppose there's no real need to use a UGen rather than a class or function or something, but I'm still wrapping my head around the way that the ChucK language operates. Thanks, George

6 9

Ramping Sine and other Inputs
by Perry Cook 13 Jul '12

13 Jul '12

> Jordan Orelli <jordanorelli(a)gmail.com> Wrote: > there's no way to use this to ramp an arbitrary variable, > like the frequency of a SinOsc, for example, is there? > Cause I do stuff like this and find it kinda annoying: Hey Jordan, Not for any arbitrary UG, but for SineOsc, Phasor, and some others, there is a .sync() method that instructs them to look at anything ChucKed to their input as a frequency. Here's a silly example with SinOsc: SinOsc s => dac; 0 => s.sync; Step blah => Envelope freq => s; 1.0 => blah.next; 0.5 :: second => freq.duration; 1 => freq.keyOn; while (1) { Std.rand2f(0.1,1.0) :: second => now; Std.rand2f(100.0,1000.0) => freq.target; }

1 0