From 7db29a233249fd0c0ce37064c118072ca5b5a29e Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Fri, 9 Mar 2012 22:38:26 -0800
Subject: [PATCH] Clamp the upper and lower bound of the doppler velocity scale
 more like the original

---
 Alc/ALu.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 29950d77..223928bb 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -625,14 +625,15 @@ ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
     }
 
     // Calculate Velocity
-    if(DopplerFactor > 0.0f)
+    if(DopplerFactor > 0.0f && SpeedOfSound > 0.5f)
     {
         ALfloat VSS, VLS;
 
         VSS = aluDotproduct(Velocity, SourceToListener) * DopplerFactor;
         VLS = aluDotproduct(ListenerVel, SourceToListener) * DopplerFactor;
 
-        Pitch *= maxf(SpeedOfSound-VLS, 1.0f) / maxf(SpeedOfSound-VSS, 1.0f);
+        Pitch *= clampf(SpeedOfSound-VLS, 1.0f, SpeedOfSound*2.0f - 1.0f) /
+                 clampf(SpeedOfSound-VSS, 1.0f, SpeedOfSound*2.0f - 1.0f);
     }
 
     BufferListItem = ALSource->queue;
-- 
2.11.4.GIT