From 19b8deba66528d4666377004637ec362ee4fac09 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Thu, 8 Apr 2010 15:23:03 -0700
Subject: [PATCH] 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

---
 Alc/ALc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

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;
+    }
 }
 
 /*
-- 
2.11.4.GIT