robot36/delay.c

#include "delay.h"
#include <stdlib.h>

float do_delay(delay_t *d, float input)
{
	d->s[d->last] = input;
	d->last = (d->last + 1) < d->len ? d->last + 1 : 0;
	return d->s[d->last];
}

delay_t *alloc_delay(int samples)
{
	int len = samples + 1;
	delay_t *d = malloc(sizeof(delay_t));
	d->s = malloc(sizeof(float) * len);
	d->last = 0;
	d->len = len;
	for (int i = 0; i < len; i++)
		d->s[i] = 0.0;
	return d;
}
void free_delay(delay_t *delay)
{
	free(delay->s);
	free(delay);
}