From ff0d70c8a9c2d9266da20039cb1a98ed20b6df12 Mon Sep 17 00:00:00 2001
From: Valerii Zapodovnikov <val.zapod.vz@gmail.com>
Date: Mon, 24 May 2021 06:42:32 +0300
Subject: [PATCH] avfilter/vf_hqdn3d: fix left shift of negative numbers

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavfilter/vf_hqdn3d.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_hqdn3d.c b/libavfilter/vf_hqdn3d.c
index 8d71ae316d..bd3eb2d01c 100644
--- a/libavfilter/vf_hqdn3d.c
+++ b/libavfilter/vf_hqdn3d.c
@@ -179,7 +179,7 @@ static void precalc_coefs(double dist25, int depth, int16_t *ct)
 
     gamma = log(0.25) / log(1.0 - FFMIN(dist25,252.0)/255.0 - 0.00001);
 
-    for (i = -256<<LUT_BITS; i < 256<<LUT_BITS; i++) {
+    for (i = -(256<<LUT_BITS); i < 256<<LUT_BITS; i++) {
         double f = ((i<<(9-LUT_BITS)) + (1<<(8-LUT_BITS)) - 1) / 512.0; // midpoint of the bin
         simil = FFMAX(0, 1.0 - fabs(f) / 255.0);
         C = pow(simil, gamma) * 256.0 * f;