/************************** BEGIN dsp-checker.h **************************
FAUST Architecture File
Copyright (C) 2003-2022 GRAME, Centre National de Creation Musicale
---------------------------------------------------------------------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

EXCEPTION : As a special exception, you may create a larger work
that contains this FAUST architecture section and distribute
that work under terms of your choice, so long as this FAUST
architecture section is not modified.
************************************************************************/

#ifndef __dsp_checker__
#define __dsp_checker__

#include <iostream>
#include <cmath>

#include "faust/dsp/dsp.h"
#include "faust/audio/fpe.h"

//------------------------------------------------------------------------------
// dsp_me_checker: a DSP decorator to check math Floating Point Exceptions (FPE)
// - when 'runtime' is true FPE checking is done with signals/exceptions
// and the program exit at first exception
// - when 'runtime' is false FPE checking is done while running and
// SUBNORMAL, INFINITE, NAN statistics can be displayed with printStats()
//------------------------------------------------------------------------------

class dsp_me_checker : public decorator_dsp
{
    
    private:
    
        long long fFP_SUBNORMAL;
        long long fFP_INFINITE;
        long long fFP_NAN;
        bool fRuntime;
    
        void getStats(int cout, FAUSTFLOAT** outputs)
        {
            for (int chan = 0; chan < fDSP->getNumOutputs(); chan++) {
                for (int frame = 0; frame < cout; frame++) {
                    FAUSTFLOAT value = outputs[chan][frame];
                    if (std::isnan(value)) {
                        fFP_NAN++;
                    } else if (std::isinf(value)) {
                        fFP_INFINITE++;
                    } else if (std::fpclassify(value) == FP_SUBNORMAL) {
                        fFP_SUBNORMAL++;
                    }
                }
            }
        }
    
    public:
    
        dsp_me_checker(::dsp* dsp, bool runtime = false)
        :decorator_dsp(dsp),
        fFP_SUBNORMAL(0),
        fFP_INFINITE(0),
        fFP_NAN(0),
        fRuntime(runtime)
        {}
    
        virtual ~dsp_me_checker() {}
    
        void compute(int count, FAUSTFLOAT** inputs, FAUSTFLOAT** outputs)
        {
            if (fRuntime) {
                TRY_FPE
                fDSP->compute(count, inputs, outputs);
                CATCH_FPE
            } else {
                fDSP->compute(count, inputs, outputs);
                getStats(count, outputs);
            }
        }
        void compute(double date_usec, int count, FAUSTFLOAT** inputs, FAUSTFLOAT** outputs)
        {
            if (fRuntime) {
                TRY_FPE
                fDSP->compute(date_usec, count, inputs, outputs);
                CATCH_FPE
            } else {
                fDSP->compute(date_usec, count, inputs, outputs);
                getStats(count, outputs);
            }
        }
    
        void printStats()
        {
            std::cout << "-------------------------------" << std::endl;
            std::cout << "FP_SUBNORMAL: " << fFP_SUBNORMAL << std::endl;
            std::cout << "FP_INFINITE: " << fFP_INFINITE << std::endl;
            std::cout << "FP_NAN: " << fFP_NAN << std::endl;
            std::cout << "-------------------------------" << std::endl;
        }
    
};

#endif
/************************** END dsp-checker.h **************************/
