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avfilter/window_func: use a constant instead of acosh()

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Should fix compilation with non C99 compilers like msvc 2012, where
acosh() is not available.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2016-08-20 01:03:00 -03:00
parent 18ce63a60e
commit 27ee70290e
1 changed files with 1 additions and 1 deletions
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libavfilter/window_func.c
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@ -117,7 +117,7 @@ void ff_generate_window_func(float *lut, int N, int win_func, float *overlap)
*overlap = 0.33;
break;
case WFUNC_DOLPH: {
double b = cosh(acosh(pow(10., 3)) / (N-1)), sum, t, c, norm = 0;
double b = cosh(7.6009022095419887 / (N-1)), sum, t, c, norm = 0;
int j;
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)