ref: 8a700fc7e0d8f2815e353de9aae8ad7b3594eb1a
dir: /h/delay.h/
typedef struct {
SPFLOAT time;
SPFLOAT feedback;
SPFLOAT last;
SPFLOAT *buf;
uint32_t bufsize;
uint32_t bufpos;
} sp_delay;
int sp_delay_create(sp_delay **p);
int sp_delay_destroy(sp_delay **p);
int sp_delay_init(sp_data *sp, sp_delay *p, SPFLOAT time);
int sp_delay_compute(sp_data *sp, sp_delay *p, SPFLOAT *in, SPFLOAT *out);