Handle very small speed of sound values

1 files changed, 7 insertions, 1 deletions

diff --git a/Alc/ALu.c b/Alc/ALu.c
index fc0980e8..4a0d4d38 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -636,10 +636,16 @@ ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
     }
 
     // Calculate Velocity
-    if(DopplerFactor > 0.0f && SpeedOfSound > 0.5f)
+    if(DopplerFactor > 0.0f)
     {
         ALfloat VSS, VLS;
 
+        if(SpeedOfSound < 1.0f)
+        {
+            DopplerFactor *= 1.0f/SpeedOfSound;
+            SpeedOfSound   = 1.0f;
+        }
+
         VSS = aluDotproduct(Velocity, SourceToListener) * DopplerFactor;
         VLS = aluDotproduct(ListenerVel, SourceToListener) * DopplerFactor;