Apply a scalar to the output downmix so channels don't get more than a 100% mix

All channels get the same scalar so channel balance (should be) maintained

1 files changed, 16 insertions, 0 deletions

diff --git a/Alc/ALc.c b/Alc/ALc.c
index 2bb502eb..ebe7d199 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -509,6 +509,7 @@ void EnableRTPrio(ALint level)
 
 static void SetupChannelMatrix(ALCdevice *Device)
 {
+    ALfloat maxout;
     ALuint s, s2;
 
     for(s = 0;s < OUTPUTCHANNELS;s++)
@@ -587,6 +588,21 @@ static void SetupChannelMatrix(ALCdevice *Device)
         default:
             assert(0);
     }
+
+    for(s = 0;s < OUTPUTCHANNELS;s++)
+    {
+        ALfloat out = 0.0f;
+        for(s2 = 0;s2 < OUTPUTCHANNELS;s2++)
+            out += Device->ChannelMatrix[s2][s];
+        maxout = __max(maxout, out);
+    }
+
+    maxout = 1.0f/maxout;
+    for(s = 0;s < OUTPUTCHANNELS;s++)
+    {
+        for(s2 = 0;s2 < OUTPUTCHANNELS;s2++)
+            Device->ChannelMatrix[s2][s] *= maxout;
+    }
 }
 
 /*