/* This code is placed in the public domain. */ #include <stdlib.h>#include "soundpipe.h" int sp_dmetro_create(sp_dmetro **p){    *p = malloc(sizeof(sp_dmetro));    return SP_OK;} int sp_dmetro_destroy(sp_dmetro **p){    free(*p);    return SP_OK;} int sp_dmetro_init(sp_data *sp, sp_dmetro *p){    USED(sp);     p->counter = 0;    p->time = 1.0;    return SP_OK;} int sp_dmetro_compute(sp_data *sp, sp_dmetro *p, SPFLOAT *in, SPFLOAT *out){    USED(in);     *out = 0;     if (p->counter == 0) {        *out = 1.0;        p->counter = (int)(sp->sr * p->time) + 1;    }     p->counter--;     return SP_OK;}