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convert to double only once, and make sure we can deal with negative results of -y

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This commit is contained in:
Lennart Poettering 2008-06-26 18:49:02 +02:00
parent eab1cb8df9
commit dcbb7f2680
1 changed files with 9 additions and 4 deletions
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13
src/pulsecore/time-smoother.c
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@ -295,24 +295,29 @@ static void estimate(pa_smoother *s, pa_usec_t x, pa_usec_t *y, double *deriv) {
*deriv = s->dp;
} else {
double tx, ty;
/* Ok, we're not yet on track, thus let's interpolate, and
* make sure that the first derivative is smooth */
calc_abc(s);
tx = (double) x;
/* Move to origin */
x -= s->ex;
tx -= (double) s->ex;
/* Horner scheme */
*y = (pa_usec_t) ((double) x * (s->c + (double) x * (s->b + (double) x * s->a)));
ty = (tx * (s->c + tx * (s->b + tx * s->a)));
/* Move back from origin */
*y += s->ey;
ty += (double) s->ey;
*y = ty >= 0 ? (pa_usec_t) ty : 0;
/* Horner scheme */
if (deriv)
*deriv = s->c + ((double) x * (s->b*2 + (double) x * s->a*3));
*deriv = s->c + (tx * (s->b*2 + tx * s->a*3));
}
/* Guarantee monotonicity */