From 4347bba10cf40229706ee48a8a868a35c82cd4c0 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Mon, 15 Jun 2020 18:45:11 +0200
Subject: [PATCH] codec_support/vq: do not move empty group centroid

---
 nihav-codec-support/src/vq/generic_elbg.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nihav-codec-support/src/vq/generic_elbg.rs b/nihav-codec-support/src/vq/generic_elbg.rs
index b2c838d..3c3e3c0 100644
--- a/nihav-codec-support/src/vq/generic_elbg.rs
+++ b/nihav-codec-support/src/vq/generic_elbg.rs
@@ -51,7 +51,9 @@ impl<T: VQElement, TS: VQElementSum<T>> Cluster<T, TS> {
         self.dist += u64::from(self.centroid.dist(entry.val)) * entry.count;
     }
     fn calc_centroid(&mut self) {
-        self.centroid = self.sum.get_centroid();
+        if self.count > 0 {
+            self.centroid = self.sum.get_centroid();
+        }
     }
     fn calc_dist(&mut self) {
         if self.count != 0 {
-- 
2.30.2