/* This code is placed in the public domain. */ #include <string.h>#include <stdlib.h>#include "soundpipe.h" int sp_reverse_create(sp_reverse **p){    *p = malloc(sizeof(sp_reverse));    return SP_OK;} int sp_reverse_destroy(sp_reverse **p){    free((*p)->buf);    free(*p);    return SP_OK;} int sp_reverse_init(sp_data *sp, sp_reverse *p, SPFLOAT delay){    size_t size = delay * sp->sr * sizeof(SPFLOAT) * 2;    p->bufpos = 0;    p->buf = calloc(1, size);    p->bufsize = (uint32_t)size / sizeof(SPFLOAT);    return SP_OK;} int sp_reverse_compute(sp_data *sp, sp_reverse *p, SPFLOAT *in, SPFLOAT *out){    USED(sp);     SPFLOAT *buf = p->buf;    *out = buf[p->bufpos];    buf[(p->bufsize - 1) - p->bufpos] = *in;    p->bufpos = (p->bufpos + 1) % p->bufsize;    return SP_OK;}