ref: 8ccf7af5f41042323a35fee11f29748fb02e8e1c
dir: /src/mixer/ft2_windowed_sinc.h/
#pragma once #include <stdint.h> #include <stdbool.h> #include "ft2_mix.h" // 8 or 16. 8 allows more unwanted frequencies, which may be preferred for lo-fi samples #define SINC_TAPS 8 // log2(SINC_TAPS) #define SINC_TAPS_BITS 3 #define SINC_PHASES 8192 // log2(SINC_PHASES) #define SINC_PHASES_BITS 13 #define SINC_LUT_LEN (SINC_TAPS * SINC_PHASES) #define SINC_FSHIFT (MIXER_FRAC_BITS-(SINC_PHASES_BITS+SINC_TAPS_BITS)) #define SINC_FMASK ((SINC_TAPS*SINC_PHASES)-SINC_TAPS) #define SINC_CENTER_TAP (SINC_TAPS/2) #define SINC_LEFT_TAPS ((SINC_TAPS/2)-1) #define SINC_RIGHT_TAPS (SINC_TAPS/2) // for LUT calculation #define SINC_MID_TAP ((SINC_TAPS/2)*SINC_PHASES) extern float *fKaiserSinc, *fDownSample1, *fDownSample2; bool calcWindowedSincTables(void); void freeWindowedSincTables(void);