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avfilter/f_ebur128: multiply is usually faster than divide

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Also guard against overflow when subtracting from unsigned.
This commit is contained in:
Paul B Mahol 2022-02-24 10:30:37 +01:00
parent d5ad1d7847
commit 15a1104d73
1 changed files with 3 additions and 3 deletions
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6
libavfilter/f_ebur128.c
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@ -762,7 +762,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
/* get lower loudness to consider */
n = 0;
nb_pow = LRA_LOWER_PRC * nb_powers / 100. + 0.5;
nb_pow = LRA_LOWER_PRC * 0.01 * nb_powers + 0.5;
for (i = gate_hist_pos; i < HIST_SIZE; i++) {
n += ebur128->i3000.histogram[i].count;
if (n >= nb_pow) {
@ -773,9 +773,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
/* get higher loudness to consider */
n = nb_powers;
nb_pow = LRA_HIGHER_PRC * nb_powers / 100. + 0.5;
nb_pow = LRA_HIGHER_PRC * 0.01 * nb_powers + 0.5;
for (i = HIST_SIZE - 1; i >= 0; i--) {
n -= ebur128->i3000.histogram[i].count;
n -= FFMIN(n, ebur128->i3000.histogram[i].count);
if (n < nb_pow) {
ebur128->lra_high = ebur128->i3000.histogram[i].loudness;
break;