pow is a ridiculous function for computing a simple Gaussian.
Signed-off-by: Ganesh Ajjanagadde <[email protected]>
---
libavfilter/avf_showfreqs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavfilter/avf_showfreqs.c b/libavfilter/avf_showfreqs.c
index a3665ef..3ed0155 100644
--- a/libavfilter/avf_showfreqs.c
+++ b/libavfilter/avf_showfreqs.c
@@ -227,8 +227,9 @@ static void generate_window_func(float *lut, int N, int
win_func, float *overlap
*overlap = 0.75;
break;
case WFUNC_GAUSS:
+#define SQR(x) ((x)*(x))
for (n = 0; n < N; n++)
- lut[n] = pow(M_E,-0.5*pow((n-(N-1)/2)/(0.4*(N-1)/2.f),2));
+ lut[n] = exp(-0.5 * SQR((n-(N-1)/2)/(0.4*(N-1)/2.f)));
*overlap = 0.75;
break;
default:
--
2.6.3
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