[chuck-users] sndBuf.valueAt (Forrest Curo asks)
Michael Heuer
heuermh at gmail.com
Mon Apr 20 15:15:41 EDT 2020
Note there are also a few different sample-hold chubgraphs in LiCK
https://github.com/heuermh/lick/tree/master/lick/lfo <https://github.com/heuermh/lick/tree/master/lick/lfo>
Cheers!
michael
> On Apr 20, 2020, at 2:10 PM, Forrest Curo <treegestalt at gmail.com> wrote:
>
> Yes, I'm interested!
> Whatever turns out easier, one could apply it to note lengths, amplitudes, other parameters in same way for same reasons: a bit of patterned randomness.
>
> On Mon, Apr 20, 2020 at 11:32 AM Mario Buoninfante <mario.buoninfante at gmail.com <mailto:mario.buoninfante at gmail.com>> wrote:
> Hi,
>
> In case you're interested I made a SampHold chugin that you can find here: https://github.com/mariobuoninfante/ChucK_chugins <https://github.com/mariobuoninfante/ChucK_chugins>
>
> Cheers,
> Mario
>
> On Mon, 20 Apr 2020 at 18:05, Forrest Curo <treegestalt at gmail.com <mailto:treegestalt at gmail.com>> wrote:
> "A sample and hold uses a periodic wave as an input. The wave is sampled at regular
> intervals. The resulting values are used as a control. It "samples" the wave and "holds" that
> value until a new value is sampled. It can be thought of as an analog to digital converter with
> a low frequency sampling rate (though technically the wave being sampled is also digital).
> The effect is similar to a strobe light or motion picture film taking snapshots of a smooth
> process. That smooth process is then quantized into discrete steps.
>
> "How is this useful in synthesis? Why would you want to freeze-frame a wave form?
> The idea is that even though the sample rate is too low to accurately represent the true shape
> of the wave, patterns will still emerge because the wave is periodic, and the sample rate is
> periodic."
>
> [David Cottle, _Computer Music with Examples in Supercollider 3]
>
> (This can be done in ChucK; the sndBuf containing the wave can be sampled via .valueAt without directly playing it.)
>
> On Sun, Apr 19, 2020 at 9:50 PM Forrest Curo <treegestalt at gmail.com <mailto:treegestalt at gmail.com>> wrote:
> I've achieved dreadfulness with this. Okay, will vary the rhythm etc and reduce the range, get a more interesting scale, but... hmm!
> SawOsc s => JCRev r => dac;
> .1 => s.gain;
> .1 => r.mix;
> 1 => int incsamp;
> 0 => int ps;
> 1 => float height;
> 0 => float maxsofar;
> 0 => float freq;
> SndBuf buf;
>
> "/home/forrest/chuck/examples/basic/om.wav" => buf.read;
>
> buf.samples() => int numSamples;
> Std.rand2(1, numSamples-1) => incsamp;
> while(true){
> (incsamp + ps) % numSamples => ps;
> buf.valueAt(ps) + 0.125 => height;
> Std.mtof(Math.ceil(Std.fabs(500.0 * height)) ) => freq => s.freq;
>
> if(freq > maxsofar) {
> freq => maxsofar;
> <<< maxsofar >>>;
> }
> 0.75::second => now;
> }
>
>
>
>
>
>
> On Sun, Apr 19, 2020 at 1:42 PM Forrest Curo <treegestalt at gmail.com <mailto:treegestalt at gmail.com>> wrote:
> Um. that works.
> So does this:
> SndBuf s => blackhole;
> "/home/forrest/chuck/examples/basic/om.wav" => s.read;
> float samples;
> 0 => int i;
> while (s.pos() < s.samples()) {
> <<< s.last() >>>;
> s.pos() => i;
> (s.valueAt(i)) => samples;
> <<< samples >>>;
> samp => now;
> }
>
> I was having trouble trying to read a sndBuf like an array, or put its contents into an array.
> Maybe I was reading numbers off the end of the file. Declaring
> 'float samples[]; '
> and doing
> 's.valueAt(i) => samples[i];'
>
> got me a 'Null pointer' error.
>
> Stumbling over syntax, I guess. Thanks for help!
>
> On Sun, Apr 19, 2020 at 10:54 AM Perry Cook <prc at cs.princeton.edu <mailto:prc at cs.princeton.edu>> wrote:
> This is truly odd. I don’t have easy means to test it. I don’t
> know why it wouldbe broken dependent on the dac, however.
>
> For fun you might try something like this, just to verify that the
> valueAt() function is what’s busted.
>
> SndBuf s => blackhole;
> “Fred.wav” => s.read;
>
> while (s.pos() < s.samples()) {
> <<< s.last() >>>;
> samp => now;
> }
>
> PRC
>
> > On Apr 19, 2020, at 9:00 AM, chuck-users-request at lists.cs.princeton.edu <mailto:chuck-users-request at lists.cs.princeton.edu> wrote:
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> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sun, 19 Apr 2020 07:30:15 -0700
> > From: Forrest Curo <treegestalt at gmail.com <mailto:treegestalt at gmail.com>>
> > To: ChucK Users Mailing List <chuck-users at lists.cs.princeton.edu <mailto:chuck-users at lists.cs.princeton.edu>>
> > Subject: [chuck-users] sndBuf.valueAt
> > Message-ID:
> > <CAAn-Ecy0LKVHCWmoUL2Y7w67rsibhRAHOOkN1neZyU=az3vm=g at mail.gmail.com <mailto:g at mail.gmail.com>>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Using chuck linux-jack this gives me reasonable numbers between -1 and 1.
> > Using chuck linux-alsa I'm able to play the file I've read into sndBuf; but
> > trying to copy it via .valueAt gives absurdly high ["out of range"] numbers
> > at each point. [It can be a different high number different times I run
> > chuck, but the number it is turns up at every point I sample.]
> >
> > Is there a fix for this? Aside from using jack on a computer where it
> > befnurgles the midi?
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