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avfilter/af_crossfeed: fix calculation of alpha parameter 

Use A in calculation.
This commit is contained in:
Paul B Mahol 2020-04-30 11:44:48 +02:00
parent c7d8082357
commit 0ec61fcff7
1 changed files with 1 additions and 1 deletions
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2
libavfilter/af_crossfeed.c
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@ -62,7 +62,7 @@ static int config_input(AVFilterLink *inlink)
double w0 = 2 * M_PI * (1. - s->range) * 2100 / inlink->sample_rate;
double alpha;
alpha = sin(w0) / 2 * sqrt(2 * (1 / 0.5 - 1) + 2);
alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / 0.5 - 1) + 2);
s->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
s->a1 = -2 * ((A - 1) + (A + 1) * cos(w0));