From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Wed, 8 Apr 2020 08:15:36 +0000 (+0200)
Subject: intel263: fix quantisation
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=1032dfe16237d2cefa04e616d8202222af790401;p=nihav.git

intel263: fix quantisation
---

diff --git a/nihav-indeo/src/codecs/intel263.rs b/nihav-indeo/src/codecs/intel263.rs
index 42d0380..b2e58cb 100644
--- a/nihav-indeo/src/codecs/intel263.rs
+++ b/nihav-indeo/src/codecs/intel263.rs
@@ -79,7 +79,11 @@ impl<'a> Intel263BR<'a> {
                 level = code.get_level();
                 last  = code.is_last();
                 if br.read_bool()? { level = -level; }
-                level = (level * q) + q_add;
+                if level > 0 {
+                    level = (level * q) + q_add;
+                } else {
+                    level = (level * q) - q_add;
+                }
             } else {
                 last  = br.read_bool()?;
                 run   = br.read(6)? as u8;
@@ -89,7 +93,11 @@ impl<'a> Intel263BR<'a> {
                     let top = br.read_s(6)? as i16;
                     level = (top << 5) | low;
                 }
-                level = (level * q) + q_add;
+                if level > 0 {
+                    level = (level * q) + q_add;
+                } else {
+                    level = (level * q) - q_add;
+                }
                 if level < -2048 { level = -2048; }
                 if level >  2047 { level =  2047; }
             }