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avfilter/window_func: clarify intention in dolph window calculation

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Paul B Mahol 2019-09-16 10:57:09 +02:00
parent 654601dd1d
commit fa045c3ce2
1 changed files with 1 additions and 1 deletions
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libavfilter/window_func.h
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@ -133,7 +133,7 @@ static inline void generate_window_func(float *lut, int N, int win_func,
for (c = 1 - 1 / (b*b), n = (N-1) / 2; n >= 0; --n) { for (c = 1 - 1 / (b*b), n = (N-1) / 2; n >= 0; --n) {
for (sum = !n, b = t = j = 1; j <= n && sum != t; b *= (n-j) * (1./j), ++j) for (sum = !n, b = t = j = 1; j <= n && sum != t; b *= (n-j) * (1./j), ++j)
t = sum, sum += (b *= c * (N - n - j) * (1./j)); t = sum, sum += (b *= c * (N - n - j) * (1./j));
sum /= (N - 1 - n), sum /= (norm = norm ? norm : sum); sum /= (N - 1 - n), norm = norm ? norm : sum, sum /= norm;
lut[n] = sum; lut[n] = sum;
lut[N - 1 - n] = sum; lut[N - 1 - n] = sum;
} }