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avfilter/af_dynaudnorm: remove wasteful pow

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This removes wasteful pow(x, 2.0) that although not terribly important
for speed, is still useless.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde
2015-11-24 23:34:48 -05:00
parent 9ee1feaa7c
commit 352bd18dff
1 changed files with 2 additions and 2 deletions
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4
libavfilter/af_dynaudnorm.c
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@@ -237,13 +237,13 @@ static void init_gaussian_filter(DynamicAudioNormalizerContext *s)
// Pre-compute constants // Pre-compute constants
const int offset = s->filter_size / 2; const int offset = s->filter_size / 2;
const double c1 = 1.0 / (sigma * sqrt(2.0 * M_PI)); 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 // Compute weights
for (i = 0; i < s->filter_size; i++) { for (i = 0; i < s->filter_size; i++) {
const int x = i - offset; 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]; total_weight += s->weights[i];
} }