From 352bd18dff147ec1150c32a034046c6420ae1d36 Mon Sep 17 00:00:00 2001 From: Ganesh Ajjanagadde Date: Tue, 24 Nov 2015 23:34:48 -0500 Subject: [PATCH] avfilter/af_dynaudnorm: remove wasteful pow This removes wasteful pow(x, 2.0) that although not terribly important for speed, is still useless. Reviewed-by: Paul B Mahol Signed-off-by: Ganesh Ajjanagadde --- libavfilter/af_dynaudnorm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavfilter/af_dynaudnorm.c b/libavfilter/af_dynaudnorm.c index 62a2653ec5..5f412f5d91 100644 --- a/libavfilter/af_dynaudnorm.c +++ b/libavfilter/af_dynaudnorm.c @@ -237,13 +237,13 @@ static void init_gaussian_filter(DynamicAudioNormalizerContext *s) // Pre-compute constants const int offset = s->filter_size / 2; const double c1 = 1.0 / (sigma * sqrt(2.0 * M_PI)); - const double c2 = 2.0 * pow(sigma, 2.0); + const double c2 = 2.0 * sigma * sigma; // Compute weights for (i = 0; i < s->filter_size; i++) { const int x = i - offset; - s->weights[i] = c1 * exp(-(pow(x, 2.0) / c2)); + s->weights[i] = c1 * exp(-x * x / c2); total_weight += s->weights[i]; } -- GitLab