ref: a27852654d9784d36f24478dff46df1e74cb5065
dir: /src/mixer/ft2_windowed_sinc.h/
#pragma once #include <stdint.h> #include <stdbool.h> #ifndef MIXER_FRAC_BITS #define MIXER_FRAC_BITS 32 #endif // if you change this, also change SINC_PHASES_BITS (>4096 makes little sense) #define SINC_PHASES 4096 #define SINC_PHASES_BITS 12 /* log2(SINC_PHASES) */ // don't change these! #define SINC_TAPS 8 #define SINC_TAPS_BITS 3 #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_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 double *gKaiserSinc; extern double *gDownSample1; extern double *gDownSample2; bool calcWindowedSincTables(void); void freeWindowedSincTables(void);