From 3f3a3ac4f1d069542ca2399a8b5e63d9d1a4df3b Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Thu, 17 Aug 2017 05:53:16 -0700
Subject: Properly calculate the filter size

---
 utils/makehrtf.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/utils/makehrtf.c b/utils/makehrtf.c
index 963528bb..c9c2d10c 100644
--- a/utils/makehrtf.c
+++ b/utils/makehrtf.c
@@ -1296,10 +1296,11 @@ static void ResamplerSetup(ResamplerT *rs, const uint srcRate, const uint dstRat
         cutoff = 0.475 / rs->mQ;
         width = 0.05 / rs->mQ;
     }
-    // A rejection of -180 dB is used for the stop band.
-    l = CalcKaiserOrder(180.0, width) / 2;
+    // A rejection of -180 dB is used for the stop band. Round up the order to
+    // keep the transition width from growing.
+    l = (CalcKaiserOrder(180.0, width)+1) / 2;
     beta = CalcKaiserBeta(180.0);
-    rs->mM = (2 * l) + 1;
+    rs->mM = (l+1) * 2;
     rs->mL = l;
     rs->mF = CreateArray(rs->mM);
     for(i = 0;i < ((int)rs->mM);i++)
-- 
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