On 12/9/15, Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote: > pow is a ridiculous function for computing a simple Gaussian. > > Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com> > --- > 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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