Re: [chuck-users] sndBuf.valueAt (Forrest Curo asks)

20 Apr 2020

      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  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  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@lists.cs.princeton.edu
wrote:
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Today's Topics:
1. sndBuf.valueAt (Forrest Curo)
----------------------------------------------------------------------
Message: 1
Date: Sun, 19 Apr 2020 07:30:15 -0700
From: Forrest Curo 
To: ChucK Users Mailing List 
Subject: [chuck-users] sndBuf.valueAt
Message-ID:

Content-Type: text/plain; charset="utf-8"
Using chuck linux-jack this gives me reasonable numbers between -1 and
...
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?