AudioKissFFT.h

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#pragma once
 
#include "kiss_fix.h" 
#include "AudioFFT.h"
 
namespace audio_tools {
 
class FFTDriverKissFFT : public FFTDriver {
    public:
        bool begin(int len) override {
            this->len = len;
            k_data.resize(len);
            if (p_fft_object==nullptr) p_fft_object = cpp_kiss_fft_alloc(len,false,nullptr,nullptr);
            assert(p_fft_object!=nullptr);
            return p_fft_object!=nullptr;
        }   
 
        void end() override {
            if (p_fft_object!=nullptr) kiss_fft_free(p_fft_object);
            if (p_fft_object_inv!=nullptr) kiss_fft_free(p_fft_object_inv);
 
            p_fft_object = nullptr;
            k_data.resize(0);
        }
        void setValue(int idx, float value) override {
            k_data[idx].r  = value; 
        }
 
        void fft() override {
           cpp_kiss_fft (p_fft_object, k_data.data(), k_data.data());    
        };
 
        void rfft() override {
           if(p_fft_object_inv==nullptr) {
            p_fft_object_inv = cpp_kiss_fft_alloc(len,true,nullptr,nullptr);
           }
           cpp_kiss_fft (p_fft_object_inv, k_data.data(), k_data.data());    
        };
 
        float magnitude(int idx) override { 
            return sqrt(magnitudeFast(idx));
        }
 
        float magnitudeFast(int idx) override { 
            return (k_data[idx].r * k_data[idx].r + k_data[idx].i * k_data[idx].i);
        }
 
        bool isValid() override{ return p_fft_object!=nullptr; }
 
        bool isReverseFFT() override {return true;}
 
        float getValue(int idx) override { return k_data[idx].r; }
 
        bool setBin(int pos, FFTBin &bin)  { return FFTDriver::setBin(pos, bin);}
 
        bool setBin(int pos, float real, float img) override {
            if (pos>=len) return false;
            k_data[pos].r = real;
            k_data[pos].i = img;
            return true;
        }
        bool getBin(int pos, FFTBin &bin) override { 
            if (pos>=len) return false;
            bin.real = k_data[pos].r;
            bin.img = k_data[pos].i;
            return true;
        }
 
        kiss_fft_cfg p_fft_object=nullptr;
        kiss_fft_cfg p_fft_object_inv=nullptr;
        Vector<kiss_fft_cpx> k_data{0}; // real
        int len = 0;
 
};
class AudioKissFFT : public AudioFFTBase {
    public:
        AudioKissFFT():AudioFFTBase(new FFTDriverKissFFT()) {}
 
        kiss_fft_cpx *dataArray() {
            return driverEx()->k_data.data();
        }
 
        FFTDriverKissFFT* driverEx() {
            return (FFTDriverKissFFT*)driver();
        }
};
 
 
}