/* This code is placed in the public domain. */ #include <math.h>#include <stdlib.h>#include "soundpipe.h" int sp_noise_create(sp_noise **ns){    *ns = malloc(sizeof(sp_noise));    return SP_OK;} int sp_noise_init(sp_data *sp, sp_noise *ns){    USED(sp);     ns->amp = 1.0;    return SP_OK;} int sp_noise_compute(sp_data *sp, sp_noise *ns, SPFLOAT *in, SPFLOAT *out){    USED(sp, in);     *out = ((sp_rand(sp) % SP_RANDMAX) / (SP_RANDMAX * 1.0));    *out = (*out * 2) - 1;    *out *= ns->amp;    return SP_OK;} int sp_noise_destroy(sp_noise **ns){    free(*ns);    return SP_OK;}