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avfilter/window_func: add cauchy, parzen and poisson window function

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This commit is contained in:
Paul B Mahol
2016-08-16 18:03:56 +02:00
parent 46bfc1562f
commit b438c2025c
5 changed files with 64 additions and 1 deletions
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44
libavfilter/window_func.c
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@@ -128,6 +128,50 @@ void ff_generate_window_func(float *lut, int N, int win_func, float *overlap)
}
*overlap = 0.5;}
break;
case WFUNC_CAUCHY:
for (n = 0; n < N; n++) {
double x = 2 * ((n / (double)(N - 1)) - .5);
if (x <= -.5 || x >= .5) {
lut[n] = 0;
} else {
lut[n] = FFMIN(1, fabs(1/(1+4*16*x*x)));
}
}
*overlap = 0.75;
break;
case WFUNC_PARZEN:
for (n = 0; n < N; n++) {
double x = 2 * ((n / (double)(N - 1)) - .5);
if (x > 0.25 && x <= 0.5) {
lut[n] = -2 * powf(-1 + 2 * x, 3);
} else if (x >= -.5 && x < -.25) {
lut[n] = 2 * powf(1 + 2 * x, 3);
} else if (x >= -.25 && x < 0) {
lut[n] = 1 - 24 * x * x - 48 * x * x * x;
} else if (x >= 0 && x <= .25) {
lut[n] = 1 - 24 * x * x + 48 * x * x * x;
} else {
lut[n] = 0;
}
}
*overlap = 0.75;
break;
case WFUNC_POISSON:
for (n = 0; n < N; n++) {
double x = 2 * ((n / (double)(N - 1)) - .5);
if (x >= 0 && x <= .5) {
lut[n] = exp(-6*x);
} else if (x < 0 && x >= -.5) {
lut[n] = exp(6*x);
} else {
lut[n] = 0;
}
}
*overlap = 0.75;
break;
default:
av_assert0(0);
}