Use the app-specified speed of sound for reverb decay

Specifically, the initial reverb decay as determined by the source distance,
and the reverb decayhf limit from air absorption.

1 files changed, 2 insertions, 1 deletions

diff --git a/Alc/ALu.c b/Alc/ALu.c
index dc14815d..dcd00c5b 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -1105,7 +1105,8 @@ static void CalcAttnSourceParams(ALvoice *voice, const struct ALvoiceProps *prop
         else if(SendSlots[i]->Params.AuxSendAuto)
         {
             RoomRolloff[i] = SendSlots[i]->Params.RoomRolloff + props->RoomRolloffFactor;
-            DecayDistance[i] = SendSlots[i]->Params.DecayTime * SPEEDOFSOUNDMETRESPERSEC;
+            DecayDistance[i] = SendSlots[i]->Params.DecayTime * Listener->Params.SpeedOfSound *
+                               Listener->Params.MetersPerUnit;
             DecayHFDistance[i] = DecayDistance[i] * SendSlots[i]->Params.DecayHFRatio;
             if(SendSlots[i]->Params.DecayHFLimit)
             {