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

Re: [chuck-users] Sending raw midi / sysex
by Julian Faust 09 Aug '12

09 Aug '12

Success! Breaking 17 values into 6 triplets worked, with the data3 of the 6th being ignored. The first and last value mark the start and end of the sysex message, which I guess is why it works. Thankfully I only need to send and not receive these crazy messages. I'm playing around with a Livid Block and this allows me to set the state of all 64 lights with just 6 midi messages, instead of 64. I'm thinking this could make a difference in performance for something like making all the lights blink really fast, though that will also depend on if it prioritizes notes over sysex or something. -Julian

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Sending raw midi / sysex
by Julian Faust 08 Aug '12

08 Aug '12

Hi all, Is it possible to send arbitrary midi messages like F0 00 01 61 03 04 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F F7 (for example) ? I understand that you can work with hex, but it seems that MidiMsg is fixed at 3 data slots, and MidiIn and MidiOut interface via MidiMsg. Is there any way to use MidiOut without MidiMsg? Or possibly overload the class with a more flexible message holder? Cheers, Julian

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MIDI tutorial problem
by Peter Lutek 07 Aug '12

07 Aug '12

BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; }greetings! a chuck novice here, so likely some silly user error!.... ;-) working through the tutorials in the pdf manual, when following the Getting MIDI section, if i do this... MidiIn min; if( !min.open(1) ) { me.exit(); } while(true){ min => now; while( min.recv(msg) ){ ; } } ...chuck throws me an "undefined variable 'msg'..." error! something i'm missing? recent change in MIDI syntax? (i'm on chuck v1.2.1.3 on linux) "chuck --probe" does show my desired MIDI interface as "1". thanks in advance... cheers! .pltk.

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waveform generation by function
by Sample Hampton 06 Aug '12

06 Aug '12

Users, What is the best way to do waveform generation--one sample at time of course--with math functions? First I tried chucking a variable straight to the dac, but it didn't take. Then I tried chucking a variable to the value of a Step, and chucking the Step to the dac. That did work, and below I have a simple lpf'ed sawtooth going. Is there, however, a more conventional and direct way of doing this? Step taint => LPF passer => dac; 400 => passer.freq; -0.2 => float v; while(true) { v + 0.004 => v; if (v > 0.2) { -0.2 => v; } v => taint.next; 1::samp => now; } Sample

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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

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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

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