/* This code is placed in the public domain. */ #include <stdlib.h>#include "soundpipe.h"#include "../lib/spa/spa.h" #define SPA_BUFSIZE 4096 int sp_sparec_create(sp_sparec **p){    *p = malloc(sizeof(sp_sparec));    return SP_OK;} int sp_sparec_destroy(sp_sparec **p){    sp_sparec *pp = *p;    free(pp->buf);    spa_close(&pp->spa);    free(*p);    return SP_OK;} int sp_sparec_init(sp_data *sp, sp_sparec *p, const char *filename){    if (spa_open(sp, &p->spa, filename, SPA_WRITE) != SP_OK) {        return SP_NOT_OK;    }     p->pos = SPA_BUFSIZE;     p->bufsize = SPA_BUFSIZE;    p->buf = calloc(1, sizeof(SPFLOAT) * p->bufsize);     return SP_OK;} int sp_sparec_compute(sp_data *sp, sp_sparec *p, SPFLOAT *in, SPFLOAT *out){    if (p->pos == 0) {        p->pos = p->bufsize;        spa_write_buf(sp, &p->spa, p->buf, p->bufsize);    }     p->buf[p->bufsize - p->pos] = *in;     p->pos--;    *out = *in;    return SP_OK;} /* call this to close sparec. will write the rest of the buffer */int sp_sparec_close(sp_data *sp, sp_sparec *p){    if (p->pos < p->bufsize - 1) {        spa_write_buf(sp, &p->spa, p->buf, p->bufsize - p->pos);    }    return SP_OK;}