[FFmpeg-cvslog] avfilter/window_func: use a constant instead of acosh()

James Almer git at videolan.org
Sat Aug 20 17:52:18 EEST 2016


ffmpeg | branch: master | James Almer <jamrial at gmail.com> | Sat Aug 20 01:03:00 2016 -0300| [27ee70290ef4c032bff5c1dd7c0db2f6d17018fe] | committer: James Almer

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 <onemda at gmail.com>
Signed-off-by: James Almer <jamrial at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=27ee70290ef4c032bff5c1dd7c0db2f6d17018fe
---

 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 fcdf6ea..acf1b20 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)



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