December 2013 - chuck-users - lists.cs.princeton.edu

New ChuGins for the new year!
by Joel Matthys 31 Dec '13

31 Dec '13

I've been hard at work developing new ChuGins, and I have them all working well, with proper documentation. I've only built them on Linux, but since I used the template, I assume they'll build just fine on Mac or Windows too. Here are my new ChuGins: - PitchTrack, a monophonic pitch tracker with good speed and accuracy even at low frequencies - GVerb, a quality stereo reverb with many adjustable parameters - Mesh2D, my favorite STK instrument that somehow never made it into ChucK. It's a great physical model of struck glass or metal plates. - Spectacle, an FFT-based spectral delay and EQ. These are all adapted from other sources, mostly RTcmix. You can clone the repo at https://github.com/jwmatthys/chugins Let me know if you have any questions! Joel

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function for creating 8 bit waveforms from expressions
by Ronni Montoya 31 Dec '13

31 Dec '13

Hi list, i been reading a paper that talks about an approach for generating sound that uses functions to directly shape waveforms. The function receives "expresions" as argument and it generates different kind of 8 bit waveforms from the expressions. An expression can look like this: f(t) = t * ( t >> 8 * ( t >>15 | t >> 8) & 20 | ( t >>19) * 5 >> t | t >> 3)) The paper describes the algorithm in this way: algorithm 1 : Construction of an 8-bit waveform of 8000Hz sample rate: The function has 2 inputs : Input 1) a functional expresion f(t) Input 2 ) time durations in seconds (d) Output: the waveform of an audio signal with seconds duration for t = 1 to d8000 do if f(t) ==NaN then q(t) <-- 0 else q(t) <-- mod(f(t)), 256) end if s(t) <-- 2 q(t)/255 - 1 end for If its possible to implement this approach for generating sound in chuck?? cheers R.

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KBHit events
by Manuel Bärenz 26 Dec '13

26 Dec '13

Hello again, I also wanted to demonstrate a simple sequencer prototype that lets me record a file and then plays it back to me. I've come this far: KBHit kb; me.sourceDir() + "/bum.wav" => string filename; adc => WvOut b => blackhole; filename => b.wavFilename; kb => now; b.closeFile(); SndBuf buf => dac; filename => buf.read; kb => now; But strangely, the program doesn't wait for the second kb event, but exits directly after the first key that I hit. Any ideas what I'm doing wrong? Best, Manuel

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chugin tutorial or docs?
by Joel Matthys 25 Dec '13

25 Dec '13

I'm trying to implement a good pitch tracker as a ChuGin. Is there any kind of tutorial or walk-through that anyone has done? A few questions: - Is it possible to create a UAna ChuGin or must it be a UGen? - How do you suggest implementing an FFT-based instrument which uses 1024 or 2048 sample frames for analysis? - Besides the CCRMA paper and the source code, is there any documentation of ChuGin programming? Thanks! Joel

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ChucK for live musicians
by joe higham 21 Dec '13

21 Dec '13

hi @ chuck-users lists I'm busy following the Coursera ChucK course provided by CAL Arts. As a live musician I was hoping to discover how one could use ChucK live (in the same way as Pure Data, Max/MSP etc). We've seen Ajay Kapur (whom I'm sure you all know) using his sitar in a live concert video made at CalArts, but no explanation followed. Unfortunately it seems that the course isn't going to cover this topic, so I've joined the list hoping people can help me out. Would it be possible to start giving me a few basic outlines for how to use ChucK via the adc (I'm a sax player). If you're interested (and if it works) here's a link to a thread created via CalArts and Coursera asking these questions: https://class.coursera.org/chuck101-001/forum/thread?thread_id=1429#post-77… You won't be able to comment but you will notice that we all wonder if one should pass via blackhole, if we should use a FFT etc. And more important, how? Thanks in advance Joe

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Eclipse Plugin
by Alejandro Salas 15 Dec '13

15 Dec '13

Hello everyone, I don't know if this has been addressed elsewhere. I searched the archives and couldn't find anything. I was wondering if there was any initiative on creating a plugin for eclipse. I have some experience creating plugins for eclipse (although I haven't done any in a while), and I'm willing to help if necessary. Thanks.

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Cast dur to int
by Juan-Pablo Caceres 12 Dec '13

12 Dec '13

Hello list, Is there a way to cast a dur (samples) to an int in chuck? This doesn't work: 1::second => dur pduration; pduration $ int => int srate; Thanks for your help! JPC

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Unable to build ChucK 1.3.3.0 for ALSA on Arch Linux
by Jeff Jacobson 06 Dec '13

06 Dec '13

After running 'make linux-alsa' things run smoothly until: g++ -I. -Ilo -O3 -D__LINUX_ALSA__ -D__PLATFORM_LINUX__ -O3 -fno-strict-aliasing -D__CK_SNDFILE_NATIVE__ -c ulib_regex.cpp -o ulib_regex.o ulib_regex.cpp: In function ‘void regex_replace(void*, Chuck_DL_Return*, Chuck_VM_Shred*, CK_DL_API)’: ulib_regex.cpp:308:19: warning: converting to non-pointer type ‘long int’ from NULL [-Wconversion-null] RETURN->v_int = NULL; ^ ulib_regex.cpp: In function ‘void regex_replaceAll(void*, Chuck_DL_Return*, Chuck_VM_Shred*, CK_DL_API)’: ulib_regex.cpp:397:19: warning: converting to non-pointer type ‘long int’ from NULL [-Wconversion-null] RETURN->v_int = NULL; ^ g++ -I. -Ilo -O3 -D__LINUX_ALSA__ -D__PLATFORM_LINUX__ -O3 -fno-strict-aliasing -D__CK_SNDFILE_NATIVE__ -c util_buffers.cpp -o util_buffers.o g++ -I. -Ilo -O3 -D__LINUX_ALSA__ -D__PLATFORM_LINUX__ -O3 -fno-strict-aliasing -D__CK_SNDFILE_NATIVE__ -c util_console.cpp -o util_console.o g++ -I. -Ilo -O3 -D__LINUX_ALSA__ -D__PLATFORM_LINUX__ -O3 -fno-strict-aliasing -D__CK_SNDFILE_NATIVE__ -c util_string.cpp -o util_string.o util_string.cpp: In function ‘std::string get_full_path(const string&)’: util_string.cpp:393:14: error: ‘PATH_MAX’ was not declared in this scope char buf[PATH_MAX]; ^ util_string.cpp:395:42: error: ‘buf’ was not declared in this scope char * result = realpath(fp.c_str(), buf); ^ makefile:144: recipe for target 'util_string.o' failed make: *** [util_string.o] Error 1 My googling found no similar errors. Versions of dependencies are as follows: alsa-lib 1.0.27.2-1 alsa-utils 1.0.27.2-1 libsndfile 1.0.25-3 gcc 4.8.2-5 flex 2.5.37-1 bison 3.0.1-1 make 4.0-1 I'm new to building software from source so I apologize if this is a beginner's misunderstanding. Thanks for any help you can give me; I'm looking forward to trying ChucK.

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No simple vibrato example
by Manuel Bärenz 05 Dec '13

05 Dec '13

Hi guys, I'm giving a presentation on ChucK tomorrow and I wanted to show off some of the basic features in a live coding session. I found that creating a vibrato (modulating the frequency) is far too hard. The example I'm looking at is http://chuck.cs.princeton.edu/doc/examples/basic/whirl.ck. In an infinite loop, you have this code: 30 + ( Math.sin(t) + 1.0 ) * 10000.0 => s.sfreq; t + .004 => t; Here, t is a float and s is a SinOsc. Now, what I would have expected is the following, more intuitive setup outside the loop: 30 + SinOsc freq_mod => s.freq; 1 => freq_mod.freq; I know that the first line with the "30 + SinOsc" is probably nonsense in itself, but I could work around that (by using a step UGen for example). My actual problem is that you can't chuck a SinOsc into s.freq. Consider this line: SinOsc freq_mod => s.freq; I get an error like this: arguments type(s) do not match: ... for function 'SinOsc.freq(...)' ... ...(please check the argument types) Is this something that the language is simply not capable of or am I doing something wrong? Best, Manuel

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MIDI-synchronization and metric timing (?)
by Blixa Barscheck 05 Dec '13

05 Dec '13

Hi, ChucK-Community! My name is Steve. So far I have been using Max 6 for MIDI-programming. My primary workflow is that I generate MIDI-data in Max and send them to my DAW where it's used to trigger several SoftSynths. I am the point now, however, where Max doesn't offer me enough flexibility to realize what I want to do. I am considering switching to ChucK. There is one thing, however, I need to know about ChucK: In Max I am able to synchronize it's timing mechanism to my DAW and define any kind of timing data (e.g.: frequency of an LFOsc) in metric timing (1/16-notes, 1/8-notes, etc.). Is this also possible in ChucK? If no, then ChucK unfortunately is no option for me, at least at the moment. Thanks! best regards, steve -- Diese E-Mail wurde aus dem Sicherheitsverbund E-Mail made in Germany versendet: http://www.gmx.net/e-mail-made-in-germany

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