From 27ee70290ef4c032bff5c1dd7c0db2f6d17018fe Mon Sep 17 00:00:00 2001 From: James Almer Date: Sat, 20 Aug 2016 01:03:00 -0300 Subject: [PATCH] avfilter/window_func: use a constant instead of acosh() Should fix compilation with non C99 compilers like msvc 2012, where acosh() is not available. Reviewed-by: Paul B Mahol Signed-off-by: James Almer --- libavfilter/window_func.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavfilter/window_func.c b/libavfilter/window_func.c index fcdf6ea30e..acf1b20847 100644 --- a/libavfilter/window_func.c +++ b/libavfilter/window_func.c @@ -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)