Real time pitch shifting with ScriptNode

FPSzky

Hi all, I'm developing a reverb VST plugin in HISE with ScriptNode and I've been trying to add a shimmer reverb engine to it (which is basically a reverb that feeds back into itself but pitches the original source material by +12 semitones, and that goes on and on and on... until the input has stopped), My question is, is it possible? or am I just missing something? (which is very likely)

Any help would be much appreciated. Thanks.

aaronventure

@FPSzky use faust

Theres this https://github.com/azur1s/elysiera/blob/main/

And this https://github.com/thedrgreenthumb/faust/blob/master/shimmer.dsp

JulesV

@aaronventure
If some external codes are embedded in a Faust dsp code, how can we run it in HISE? For example, like this Shimmer;

import ("music.lib");
import("filter.lib");
import("effect.lib");

It doesn't work: https://github.com/thedrgreenthumb/faust/blob/master/shimmer.dsp

Lindon

@JulesV go look in the repository with your .dsp code,there will be the .lib files but in many cases these libs are now in stdfaust

JulesV

@Lindon Thanks for the info.
Do I need to copy the lib files to the Faust folder?

Lindon

@JulesV I look at thr code that is being used in the dsp and copy over the relevant functions from the lib file

JulesV

@Lindon Sorry, but I can't see the .lib files in that repository.

ulrik

@JulesV I found the libs here:
https://github.com/grame-cncm/faust/tree/master-dev/embedded/faust4processing/src/faust-libraries
and they seems to be included in the main Faust lib

Lindon

@JulesV said in Real time pitch shifting with ScriptNode:

@Lindon Sorry, but I can't see the .lib files in that repository.

yes - as @ulrik suggests your first thing to try is the std lib

JulesV

If the .lib files have already been included, then there is something else.

The below Shimmer dsp code is not working for me.

declare id   "shimmer";
declare name "Shimmer";
declare category "Reverb";

//------------------------------------
//Based on:
//ValhallaShimmer
//------------------------------------

import ("music.lib");
import("filter.lib");
import("effect.lib");

//Constrols
//PS controls
envelope = hslider("envelope", 1, 0.1,3, 0.05);//parametric_controller(control, envelope, speed, depth)*shift
speed = hslider("speed", 0.1, 0.1, 10, 0.05);
depth = hslider("depth", 0, 0, 1, 0.05);
control = hslider("control",0.5, 0, 1, 0.05);
shift = hslider("shift", 0, -6, +6, 0.1)*2; //*2 needed to conform with parametric controller output
//Reverb controls
size = hslider("size", 0.1, 1, 3, 0.05);
diffusion =  hslider("diffusion", 0.5, 0.1, 0.7, 0.05);
feedback =  hslider("feedback", 0, 0, 0.35, 0.05);
hf_damping = hslider("hf damping", 0, 0.005, 0.995, 0.005);
//Global 
dry_wet = hslider("dry/wet", 0.5, 0, 1, 0.05);

//Can be add to .lib
mixer(mix) = _*(1 - mix),_*mix:>_;

//Parametric controller, combinate signals from envelope follower and oscillator, can be added to .lib
c_folower_colibration = 6;
parametric_controller(mix, envelope_t, freq, depth) = (amp_follower(envelope_t):_*c_folower_colibration:_*depth,osc(freq)*0.5:_,_*depth):mixer(mix):_+0.5;

//Can be moved to .lib too
X = (_,_)<:(!,_,_,!);
opf(a) = (_+_*(1-a)~@(1)*a); 
allpass_with_fdelay(dt1,coef,dt2,dt2pos) = (_,_ <: (*(coef),_:+:@(dt1):fdelay(dt2,dt2pos)), -) ~ _ : (!,_);
allpass(dt,fb) = (_,_ <: (*(fb),_:+:@(dt)), -) ~ _ : (!,_);
dry_wet_mixer(c,x0,y0,x1,y1) = sel(c,x0,y0), sel(c,x1,y1)
	with { 
			sel(c,x,y) = (1-c)*x + c*y; 
		 };

APFB(dt1,fb1,dtv,dtvpos,dt2,fb2) = _:allpass_with_fdelay(dt1,fb1,dtv,dtvpos):allpass(dt2,fb2);

//PS constants, can be changed to decrease effect delay 
c_samples = 2048;
c_xfade   = 1024;
//PS implementation, copy-pasted from faust repository, see ./examples/pitch_shifter.dsp
transpose (w, x, s, sig)  =
	fdelay1s(d,sig)*fmin(d/x,1) + fdelay1s(d+w,sig)*(1-fmin(d/x,1))
	   	with {
			i = 1 - pow(2, s/12);
			d = i : (+ : +(w) : fmod(_,w)) ~ _;
	        };

process(x,y) = x,y:(_,_:
	(_,X,_:(
	(_*feedback+_*0.3:>APFB(601*size,0.7*diffusion,50,49*(osc(1)+1)/2,613*size,0.75*diffusion):opf(hf_damping)),
    (_*feedback+_*0.3:>APFB(2043*size,0.75*diffusion,50,49*(osc(1.5)+1)/2,2087*size,0.75*diffusion):opf(hf_damping))
	):X)~(
	(_*feedback:dcblockerat(80)
	:@(4325):
	APFB(2337*size,0.7*diffusion,50,49*(osc(0.7)+1)/2 ,2377*size,0.4*diffusion):@(2969):transpose(c_samples,c_xfade,	 
    (x:parametric_controller(control, envelope, speed, depth):_*shift))),
	(_*feedback:dcblockerat(80)
	:@(4763):
	APFB(1087*size,0.7*diffusion,50,49*(osc(1.3)+1)/2,1113*size,0.4*diffusion):@(3111):transpose(c_samples,c_xfade,	 			   
	(y:parametric_controller(control, envelope, speed, depth):_*shift)))))
	:dry_wet_mixer(dry_wet,x,_,y,_);

Lindon

@JulesV try adding the line;

import("stdfaust.lib");

at the start..

orange

@JulesV Try to use online faust editor and let's see if it does the same error or not

Real time pitch shifting with ScriptNode

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