shithub: soundpipe

ref: dd88a3bf36323b1917aad54943766529bcfbe9d0
dir: /h/butlp.h/

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typedef struct  {
    SPFLOAT sr, freq;
    SPFLOAT lfreq;
    SPFLOAT a[7];
    SPFLOAT pidsr;
} sp_butlp;

int sp_butlp_create(sp_butlp **p);
int sp_butlp_destroy(sp_butlp **p);
int sp_butlp_init(sp_data *sp, sp_butlp *p);
int sp_butlp_compute(sp_data *sp, sp_butlp *p, SPFLOAT *in, SPFLOAT *out);