ref: 264e4718c21792ed8ee230d39aa2b9ac88d73b14
dir: /modules/delay.c/
/* This code is placed in the public domain. */ #include <stdlib.h> #include <math.h> #include "soundpipe.h" int sp_delay_create(sp_delay **p) { *p = malloc(sizeof(sp_delay)); return SP_OK; } int sp_delay_destroy(sp_delay **p) { free((*p)->buf); free(*p); return SP_OK; } int sp_delay_init(sp_data *sp, sp_delay *p, SPFLOAT time) { p->time = time; p->bufsize = round(time * sp->sr); p->buf = calloc(1, p->bufsize * sizeof(SPFLOAT)); p->bufpos = 0; p->feedback = 0; p->last = 0; return SP_OK; } int sp_delay_compute(sp_data *sp, sp_delay *p, SPFLOAT *in, SPFLOAT *out) { SPFLOAT delay = 0, sig = 0; SPFLOAT *buf = p->buf; delay = buf[p->bufpos]; sig = (delay * p->feedback) + *in; buf[p->bufpos] = sig; p->bufpos = (p->bufpos + 1) % p->bufsize; *out = delay; return SP_OK; }