Hello Stéphane,
thanks a lot, This solve the compile error.
I take the advantage of your kindness to ask more about the language
functionality that to me is still cryptic.
here is the previous code with the int cast fix:
import("stdfaust.lib");
sampleRate = 48000;
maxTime = 4;
maxSamples = sampleRate * maxTime;
btn = button("[4]trigger");
readSpeed = hslider("[3]read_speed", 1, -3, 3, 0.1) : si.smoo;
loopSize = ba.sAndH(btn, fi.pole(btn, btn)) : int :
hbargraph("[0]loop_size", 0, maxSamples);
readIndex = readSpeed/float(sampleRate) : (+ : ma.decimal) ~ _ :
*(float(loopSize)) : int : hbargraph("[1]read_index", 0, maxSamples);
recIndex = (+(1) : %(maxSamples)) ~ *(btn) : int :
hbargraph("[2]rec_index", 0, maxSamples);
looper = rwtable(maxSamples,0.0,recIndex,_,readIndex);
process = looper, looper;
I need help to understand the recursion operator and why it doesn't work
as I expect.
this statement is clear:
recIndex = (+(1) : %(maxSamples)) ~ *(btn)
and I can translate it in something like:
recIndex = ((recIndex + 1) % maxSamples) * btn
Now I have problem understanding this one:
readIndex = readSpeed/float(sampleRate) : (+ : ma.decimal) ~ _ :
*(float(loopSize)) : int
This doesn't fit my needs as I want the speed constant independently on
the loopSize so I tried to change it in this way:
readIndex = (+(1) : %(loopSize)) ~ _ : int
that for me seems the same syntax of:
readIndex = (readIndex + 1) % loopSize
But it doesn't work. Can you please help me?
Thank you,
Daniele
On 22/12/20 12:34, Stéphane Letz wrote:
OK,
: rwtable(n,s,w,_,r) : _
Where:
• n: the table size
• s: the initial table content
• w: the write index (an int between 0 and n-1)
• r: the read index (an int between 0 and n-1)
So « w » and « r » must be of type « int » , correction here :
recIndex = (+(1) : %(maxSamples)) ~ *(btn) : hbargraph("[2]rec_index", 0,
maxSamples) : int;
This does compile (but I’ve not tested final result)
Stéphane
Le 22 déc. 2020 à 11:52, Daniele Pagliero <daniele.pagli...@gmail.com> a écrit :
Hello Stéphane,
actually I'm playing with the online Faust IDE.
Daniele
Il giorno mar 22 dic 2020 alle ore 11:40 Stéphane Letz <l...@grame.fr> ha
scritto:
Hi Daniele,
I don’t see this error when compiling here with master-dev 2.30.3 version.
Which Faust version are you using ?
Thanks.
Stéphane
Le 22 déc. 2020 à 01:34, daniele.pagli...@gmail.com a écrit :
Hi Dario,
thanks a lot! It is exactly what I needed.
To go further with the looper, here is the code so far:
import("stdfaust.lib");
sampleRate = 48000;
maxTime = 4;
maxSamples = sampleRate * maxTime;
btn = button("[4]trigger");
readSpeed = hslider("[3]read_speed", 1, -3, 3, 0.1) : si.smoo;
loopSize = ba.sAndH(btn, fi.pole(btn, btn)) : hbargraph("[0]loop_size", 0,
maxSamples);
readIndex = readSpeed/float(sampleRate) : (+ : ma.decimal) ~ _ : *(float(loopSize)) : int
: hbargraph("[1]read_index", 0, maxSamples);
recIndex = (+(1) : %(maxSamples)) ~ *(btn) : hbargraph("[2]rec_index", 0,
maxSamples);
// doesn't compile
// looper = rwtable(maxSamples,0.0,recIndex,_,readIndex);
// compiles
looper = rwtable(maxSamples,0.0,0,_,readIndex);
process = looper;
the read and write indexes are from the example I found on the documentation:
https://faustdoc.grame.fr/manual/syntax/#rwtable-primitive
I get this error for the recIndex and I can't understand its meaning:
ERROR inferring write table type, wrong write index type : RSESN interval()
Can you please point me anywhere I can figuring out what does it mean?
Sorry, my knowledge of the platform is quite small and also functional
programming syntax is not always clear to me...
Thanks,
Daniele
Il 21/12/20 15:34, Dario Sanfilippo ha scritto:
Hi, Daniele.
Perhaps something like this?
import("stdfaust.lib");
btn = button("trigger");
down_samples = ba.sAndH(btn, fi.pole(btn, btn));
process = down_samples;
Ciao,
Dario
On Mon, 21 Dec 2020 at 14:56, Daniele Pagliero <daniele.pagli...@gmail.com>
wrote:
Hello,
I need help understanding how to get the elapsed time or samples between
2 clicks on a button.
Let's say I have a button like:
btn = button("trigger");
I need to know for how long the button was pressed.
Then use the value to control a rwtable to create a variable length looper.
I've searched in the docs but I didn't find any clue...
Thanks,
Daniele
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