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

"switch" statements?
by Andrew C. Smith 23 May '10

23 May '10

Hey team, "switch" shows up as a keyword in the mini, but it's undocumented. Any ideas? I tried the java syntax (since ChucK seems to be like java) but can't seem to not get syntax errors. Thanks. Andrew

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Emptying two arrays with the same object causes "failed assertion `m_ref_count > 0'"
by Stefan Blixt 23 May '10

23 May '10

Here's some code: ------------------------------------- class MyThing { int x; } // Two identical arrays, typewise MyThing arga[0]; MyThing argb[0]; // Create an instance MyThing thing; 5 => thing.x; // Push it into arga arga << thing; // Push it into argb argb << thing; <<< "n=", arga[0].x >>>; <<< "n=", argb[0].x >>>; // clear arga 0 => arga.size; // clear argb - crash! 0 => argb.size; ------------------------------------- when I run it I get: ------------------------------------- $ chuck test. ck n= 5 n= 5 chuck_oo.cpp:120: failed assertion `m_ref_count > 0' Abort trap ------------------------------------- It seems that that 0 => arga.size decrements a reference count for thing, causing it to be freed, and then when the same thing is attempted for argb, it crashes. Possibly some reference increment missing when doing argb << thing ? /Stefan -- Release me, insect, or I will destroy the Cosmos!

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reading stereo file with WvIn
by Atte André Jensen 22 May '10

22 May '10

Hi I'm trying to do something with WvIn. As SndBuf WvIn seems to be mono, however the old trick of using to SndBuf's each with different (0/1 IIRC) chucked to channel, doesn't seem to work with WvIn. Any ideas? -- Atte http://atte.dk http://modlys.dk

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Flush ChucK IO
by Tom Aizenberg 21 May '10

21 May '10

Hi All, I am trying to make a visualization program for ChucK programs. For the communication between ChucK and the C++ code I'm writing, I use a pipe. I'd rather use a socket but I cannot see how this works in ChucK (?). When I write to chout I need to flush the buffer, just to read in the output using my own program. When I try to do this (i.e. my_IO_object.flush()) I get the following message: "(IO): internal error! inside an abstract function! help! note: please hunt down someone (e.g., Ge) to fix this..." The command I use is: chuck-1.2.1.3-exe\bin\chuck.exe chuckVis\chuckFiles\random1.ck, on Windows Vista 32-bits. Without the .flush() the script works fine, but I need the flush functionality. Has anybody got a clue how to fix this? Or maybe how to use ChucK to send messages through a socket? Greetings, Tom Aizenberg

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PItShift and SndBuff .rate = Scrubbing?
by Brutus Gates 21 May '10

21 May '10

Hi, Sorry I didn't see the obvious... But I still wanted to know if I'm on the right track: I would use: # .rate - ( float , READ/WRITE ) - set/get playback rate ( relative to file's natural speed ) To "get" the playback rate (I'm guessing it some kind of ratio???) I would then use that info to pitch shift the sound file using PitShift. Am I on the right track? B.

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LOrknet and recent PLOrk doc
by Daniel Trueman 20 May '10

20 May '10

hi everyone, a couple links for y'all: 1. Mark Cerqueira's recent research with wireless networking and laptop orchestras: http://lorknet.cs.princeton.edu/ 2. audio/video doc of the recent April 3 Princeton Laptop Orchestra performance: http://www.music.princeton.edu/~nbritt/PLOrk-Spring2010/ yep! dt

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Audio Scrubbing???
by Brutus Gates 20 May '10

20 May '10

Hi, I don't think "audio scrubbing" is the correct technical term for what I want to do... Maybe someone can suggest a better term? Here's what I want to do: I want to be able to move through a sound file along the time (or sample) "axis" while maintaining the pitch of the original. Here's how I think I would do it: The rate at which I am "scrubbing" through the sound file (using a wacom tablet for example) would be mySampleRate. I would then pitch shift by a factor of: originalSampleRate/mySampleRate Of course the devil is in the details... If anyone has a link to math or code that could help me that would be great... Or better yet, maybe Chuck has some UGens that can make this easier... B

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chuck vs. fc13/gcc4.4.4 => patch
by Fernando Lopez-Lezcano 19 May '10

19 May '10

The attached patch makes it possible to build 1.2.1.3 on top of fc13 + gcc4.4.4, I imagine other new systems will benefit. -- Fernando

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Re: [chuck-users] chuck for live performance - latency
by Jacob Doran 19 May '10

19 May '10

Great responses, all very encouraging and exciting! So I installed chuck on my Windows desktop in the form of MiniAudicle and have been running the examples. All seems good apart from one issue which I had a feeling would crop up, latency. The lowest I can set the buffer size to with it still working is 64. I have a Saffire LE sound card which should be pretty good but the latency in Chuck is too great for it to be useful in a live context. So I have a few more questions: - Should I be using Linux? Is the latency better in Linux then in Windows? If so what flavour of Linux would people recommend. - Should I be trying to build chuck for ASIO, I have seen some builds for this in the forums, but not for the latest version. - Are there any other tips or tricks for reducing the latency? Thanks again for all your help. Jacob On 18 May 2010 09:19, Jacob Doran <jacob(a)thehumanzoo.com> wrote: > Hey Chuck Users, > > I'm a computer programmer, guitarist and singer who lives in London. > Recently I have moved away from pure acoustic performances and have been > using boss loop pedal and effects in gigs which has been fantastic but I'm > already finding limitations. > > Then I had the idea that I might be able merge my programming skills with > my music and program my own loop pedal rig using ChuCK software and a midi > foot controller. It would be able to loop my guitar and voice multiple times > live (like traditional loop pedals), turn loops on and off, and also apply > real time manipulation, ping pong delays, pitch > shifting, algorithmic harmonizations and who knows what else. I would > control this all with a midi foot controller and a laptop while I play and > sing. > > I was wondering if anyone has tried doing this type of thing before? A lot > of what I have read seams to be more about virtual synthesis rather than > real time audio manipulation/looping in a live performance? Is this > something ChuCK could do well? What about performance, stability, or > latency? > > I'm going to download ChuCK and play around to try and find these answers > myself soon but any useful pointers and suggestions would be most > appreciated. > > Thanks in advance for your help, > Jacob > http://myspace.com/jacobdoran/ >

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chuck for live performance
by Jacob Doran 18 May '10

18 May '10

Hey Chuck Users, I'm a computer programmer, guitarist and singer who lives in London. Recently I have moved away from pure acoustic performances and have been using boss loop pedal and effects in gigs which has been fantastic but I'm already finding limitations. Then I had the idea that I might be able merge my programming skills with my music and program my own loop pedal rig using ChuCK software and a midi foot controller. It would be able to loop my guitar and voice multiple times live (like traditional loop pedals), turn loops on and off, and also apply real time manipulation, ping pong delays, pitch shifting, algorithmic harmonizations and who knows what else. I would control this all with a midi foot controller and a laptop while I play and sing. I was wondering if anyone has tried doing this type of thing before? A lot of what I have read seams to be more about virtual synthesis rather than real time audio manipulation/looping in a live performance? Is this something ChuCK could do well? What about performance, stability, or latency? I'm going to download ChuCK and play around to try and find these answers myself soon but any useful pointers and suggestions would be most appreciated. Thanks in advance for your help, Jacob http://myspace.com/jacobdoran/

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