shithub: ft²

ref: 0ae7a5a616127349a3a14c77ccaf8ab49a05b924
dir: /src/mixer/ft2_windowed_sinc.h/

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#ifndef _ft2_windowed_sinc_h_
#define _ft2_windowed_sinc_h_

#include <stdint.h>
#include <stdbool.h>
#include "ft2_mix.h" // MIXER_FRAC_BITS

// 8192 is a good compromise
#define SINC_PHASES 8192
#define SINC_PHASES_BITS 13 // log2(SINC_PHASES)

// do not change these!
#define SINC8_WIDTH_BITS 3 // log2(8)
#define SINC8_FSHIFT (MIXER_FRAC_BITS-(SINC_PHASES_BITS+SINC8_WIDTH_BITS))
#define SINC8_FMASK ((8*SINC_PHASES)-8)
#define SINC16_WIDTH_BITS 4 // log2(16)
#define SINC16_FSHIFT (MIXER_FRAC_BITS-(SINC_PHASES_BITS+SINC16_WIDTH_BITS))
#define SINC16_FMASK ((16*SINC_PHASES)-16)

extern float *fKaiserSinc_8, *fDownSample1_8, *fDownSample2_8;
extern float *fKaiserSinc_16, *fDownSample1_16, *fDownSample2_16;

extern float *fKaiserSinc, *fDownSample1, *fDownSample2;

bool calcWindowedSincTables(void);
void freeWindowedSincTables(void);

#endif