On Fri, Aug 9, 2019 at 2:49 PM Japina <bost...@japina.eu> wrote:
>
> I still can’t understand how the programming works in Faust in relation to
> samples. Just for me to understand it I wanted to create a script that
> changes output value at certain time.
> I know that such function already exists, but I would like to understand how
> code works in relation to time :)
>
> The idea is every 100 samples change output from 1 to -1 and back (so square
> signal). The code I’ve came up to is:
>
> out_value = 1.0;
> val = ba.if(ma.modulo(ba.time, 100) == 0, -out_value, out_value);
> process = val;
>
> But what I get is just one sample with negative value and not additional 100
> samples.
> So I guess my assumptions about how Faust is working are wrong, but I just
> can’t get the idea how to do it.
>
> Any suggestions?
>
It seems like ma.modulo doesn't do what you want.
This faust code:
process = ma.modulo(ba.time,100.0);
generates this c++ code:
for (int i = 0; (i < count); i = (i + 1)) {
iRec0[0] = (iRec0[1] + 1);
output0[i] = FAUSTFLOAT(std::fmod((std::fmod(float((iRec0[0] +
-1)), 100.0f) + 100.0f), 100.0f));
iRec0[1] = iRec0[0];
}
(I don't know what happens here)
I guess you want to use % instead of ma.modulo:
process = ba.time % 100.0;
But if I follow your thoughts correctly, it also seems like you need
to create a state. So that if state==-1, you return -1, and if
state==1, you return 1. In Faust, you can create a state by using the
recursive operator ~.
(https://faust.grame.fr/doc/manual/index.html#recursive-composition)
For this specific task, though, I would simply do it like this instead:
val = ba.if((ba.time%200) < 100, -out_value, out_value);
But maybe this isn't good enough for what you really want to achieve?
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