Error message with FAUST in HISE

toxonic

hi folks,
i enabled faust in the current hise release according to the build instructions mentioned in this Thread.
I tried to build a simple gain button:

// Faust Source File: gain
// Created with HISE on 2022-10-12
import("stdfaust.lib");
gain = vslider("gain", 0, 0,1,0.01);
process = *( _,gain),*(_,gain);

Because the vslider wasn't smoothed out, it sounded crackling when tweaking the gain knob, so i wanted to smooth it out with "si.smoo", a standard function in faust for smoothing slider movements.

// Faust Source File: gain
// Created with HISE on 2022-10-12
import("stdfaust.lib");
gain = vslider("gain", 0, 0,1,0.01):si.smoo;
process = *( _,gain),*(_,gain);

this works fine in the faust IDE (faust works) but HISE gave me the following error message:

Script FX1:! maths.lib : 133 : ERROR : syntax error, unexpected IDENT, expecting LPAR or DEF�

i also tried different simple faust scripts i once made, always the same error.
Doesn't it find the needed libraries? on Linux, faust is installed in "/usr/local", so i set that path in HISE preferences as faust path.
Any ideas on that?

Christoph Hart

@toxonic It compiles here just fine and I suspect it to be a library version mixup.

The FaustPath setting must point exactly to the location where all the faust files are located (so the direct parent of include, lib and share). Also make sure that you're using an up to date Faust version (2.50 at the moment) there were a few changes in the last release that fixed the C++ compilation.

toxonic

@Christoph-Hart mhhh... "/usr/local" contains the folders "include", "lib" and "share", so i guess, it should be the correct path to Faust, since it's the common installation folder for Faust on Linux systems, afaik. For example the "maths.lib" file is in "/usr/local/share/faust". Can you confirm, that it's the correct path for the HISE preferences?
I have installed the most current version of faust, including the LLVM backend, which i also enabled for HISE.

One more question: Are the following settings for the HISE-Standalone .jucer file correct ?

toxonic

Maybe @sletz or @etXzat have an idea?

sletz

Can you compile the same code as a separated file in a terminal?

toxonic

@sletz you mean in Faust? I already compiled it in Faust works, no problem there...

sletz

@toxonic Not in Faust Web IDE, but in a terminal on your machine:

you create a foo.dsp file with the code
then "faust foo.dsp" in a terminal, does this works?

toxonic

@sletz i'll try, when i'm back home. But i'm pretty sure it works, since i didnt't mean the Faust online compiler, but the Faust works IDE on my machine, which compiles via the local Faust compiler.

sletz

@toxonic The web Faust IDE embed its own webassembly version of the compiler and all DSP libraries. So running in a terminal is a different story.

Christoph Hart

The example works on my Macbook too so I'm pretty sure it's something with your faust installation.

What happens if you install faust to a completely different location and then set the FaustPath to this directory?

toxonic

@sletz I usually use the Faust Works IDE, so I have no experience in using Faust via terminal.
I tried to compile the code to alsa-gtk app, and there is no problem:

If i should use the terminal, could you please tell me, what to type in?
@Christoph-Hart I am not firm in installing software to other locations but the default ones. What have i got to do? "sudo make install /home/XYZ/faust"?

sletz

@toxonic You create a foo.dsp text file, you paste the DSP code. Then type "faust foo.dsp" in a terminal.

toxonic

@sletz It seems to compile properly to cpp code. This is the output:

toxonic@toxonic-studio:~/Schreibtisch$ faust gain.dsp
/* ------------------------------------------------------------
name: "gain"
Code generated with Faust 2.50.6 (https://faust.grame.fr)
Compilation options: -lang cpp -es 1 -mcd 16 -single -ftz 0
------------------------------------------------------------ */

#ifndef  __mydsp_H__
#define  __mydsp_H__

#ifndef FAUSTFLOAT
#define FAUSTFLOAT float
#endif 

#include <algorithm>
#include <cmath>
#include <cstdint>
#include <math.h>

#ifndef FAUSTCLASS 
#define FAUSTCLASS mydsp
#endif

#ifdef __APPLE__ 
#define exp10f __exp10f
#define exp10 __exp10
#endif

#if defined(_WIN32)
#define RESTRICT __restrict
#else
#define RESTRICT __restrict__
#endif


class mydsp : public dsp {
	
 private:
	
	int fSampleRate;
	float fConst0;
	float fConst1;
	FAUSTFLOAT fVslider0;
	float fRec0[2];
	
 public:
	
	void metadata(Meta* m) { 
		m->declare("compile_options", "-lang cpp -es 1 -mcd 16 -single -ftz 0");
		m->declare("filename", "gain.dsp");
		m->declare("maths.lib/author", "GRAME");
		m->declare("maths.lib/copyright", "GRAME");
		m->declare("maths.lib/license", "LGPL with exception");
		m->declare("maths.lib/name", "Faust Math Library");
		m->declare("maths.lib/version", "2.5");
		m->declare("name", "gain");
		m->declare("platform.lib/name", "Generic Platform Library");
		m->declare("platform.lib/version", "0.2");
		m->declare("signals.lib/name", "Faust Signal Routing Library");
		m->declare("signals.lib/version", "0.3");
	}

	virtual int getNumInputs() {
		return 2;
	}
	virtual int getNumOutputs() {
		return 2;
	}
	
	static void classInit(int sample_rate) {
	}
	
	virtual void instanceConstants(int sample_rate) {
		fSampleRate = sample_rate;
		fConst0 = 44.1f / std::min<float>(1.92e+05f, std::max<float>(1.0f, float(fSampleRate)));
		fConst1 = 1.0f - fConst0;
	}
	
	virtual void instanceResetUserInterface() {
		fVslider0 = FAUSTFLOAT(0.0f);
	}
	
	virtual void instanceClear() {
		for (int l0 = 0; l0 < 2; l0 = l0 + 1) {
			fRec0[l0] = 0.0f;
		}
	}
	
	virtual void init(int sample_rate) {
		classInit(sample_rate);
		instanceInit(sample_rate);
	}
	virtual void instanceInit(int sample_rate) {
		instanceConstants(sample_rate);
		instanceResetUserInterface();
		instanceClear();
	}
	
	virtual mydsp* clone() {
		return new mydsp();
	}
	
	virtual int getSampleRate() {
		return fSampleRate;
	}
	
	virtual void buildUserInterface(UI* ui_interface) {
		ui_interface->openVerticalBox("gain");
		ui_interface->addVerticalSlider("gain", &fVslider0, FAUSTFLOAT(0.0f), FAUSTFLOAT(0.0f), FAUSTFLOAT(1.0f), FAUSTFLOAT(0.01f));
		ui_interface->closeBox();
	}
	
	virtual void compute(int count, FAUSTFLOAT** RESTRICT inputs, FAUSTFLOAT** RESTRICT outputs) {
		FAUSTFLOAT* input0 = inputs[0];
		FAUSTFLOAT* input1 = inputs[1];
		FAUSTFLOAT* output0 = outputs[0];
		FAUSTFLOAT* output1 = outputs[1];
		float fSlow0 = fConst0 * float(fVslider0);
		for (int i0 = 0; i0 < count; i0 = i0 + 1) {
			fRec0[0] = fSlow0 + fConst1 * fRec0[1];
			output0[i0] = FAUSTFLOAT(float(input0[i0]) * fRec0[0]);
			output1[i0] = FAUSTFLOAT(float(input1[i0]) * fRec0[0]);
			fRec0[1] = fRec0[0];
		}
	}

};

#endif

toxonic

@Christoph-Hart Okay, i managed it to install Faust to a folder in my home directory and indeed: After pointing Hise to this directory the code works fine! :-)
On one hand that's good news and i'm lucky, that it's running. On the other hand, it is a bit annoying, that i can't install to the default directory and i don't know why.

bendurso

@toxonic I have the same error "expecting LPAR or DEF" in an effect made with Faust. The problem is only on Linux. I tried installing Faust again in a folder in my user directory, then changed the path of Faust on Hise, but it still gives me the error.

Any ideas?

Error message with FAUST in HISE

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