From 93f3e9357ba22017ef8e42bddc129a21a8eb3fcd Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 21 Sep 2009 23:52:59 -0700
Subject: [PATCH] (Re)allocate and clear the stereo-to-binaural filter as
 needed

---
 Alc/ALc.c  | 13 ++++++++++---
 Alc/bs2b.c |  2 --
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/Alc/ALc.c b/Alc/ALc.c
index 07190754..237eb4b7 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -1214,14 +1214,21 @@ ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint
 
             ALContext->Frequency = device->Frequency;
 
-            free(device->Bs2b);
-            device->Bs2b = NULL;
             if(device->Bs2bLevel > 0 && device->Bs2bLevel <= 6)
             {
-                device->Bs2b = calloc(1, sizeof(*device->Bs2b));
+                if(!device->Bs2b)
+                {
+                    device->Bs2b = calloc(1, sizeof(*device->Bs2b));
+                    bs2b_clear(device->Bs2b);
+                }
                 bs2b_set_srate(device->Bs2b, device->Frequency);
                 bs2b_set_level(device->Bs2b, device->Bs2bLevel);
             }
+            else
+            {
+                free(device->Bs2b);
+                device->Bs2b = NULL;
+            }
 
             ProcessContext(NULL);
         }
diff --git a/Alc/bs2b.c b/Alc/bs2b.c
index f8e8f8ff..f6229e90 100644
--- a/Alc/bs2b.c
+++ b/Alc/bs2b.c
@@ -113,8 +113,6 @@ static void init(struct bs2b *bs2b)
     bs2b->a1_hi = -x;
 
     bs2b->gain  = 1.0 / (1.0 - G_hi + G_lo);
-
-    bs2b_clear(bs2b);
 } /* init */
 
 /* Exported functions.