From 15a1104d73cbd47a67fc14ce2ddc97a92145695e Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Thu, 24 Feb 2022 10:30:37 +0100
Subject: [PATCH] avfilter/f_ebur128: multiply is usually faster than divide
Also guard against overflow when subtracting from unsigned.
---
libavfilter/f_ebur128.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/libavfilter/f_ebur128.c b/libavfilter/f_ebur128.c
index d5ffab7ca1..f63cf77983 100644
--- a/libavfilter/f_ebur128.c
+++ b/libavfilter/f_ebur128.c
@@ -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;