This patch solves problem 1 in 8126; it should not slow down the alaw codec, but should prevent signal degradation via multiple trips thru the codec. Fossil estimates the twice thru this codec will prevent fax from working. 4-6 times thru would result hearable, noticeable, voice degradation.

git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@80166 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 1 insertions, 1 deletions

diff --git a/main/alaw.c b/main/alaw.c
index 782419d9e..b94772ea6 100644
--- a/main/alaw.c
+++ b/main/alaw.c
@@ -71,7 +71,7 @@ static inline short int alaw2linear (unsigned char alaw)
     int seg;
 
     alaw ^= AMI_MASK;
-    i = ((alaw & 0x0F) << 4);
+    i = ((alaw & 0x0F) << 4) + 8 /* rounding error */;
     seg = (((int) alaw & 0x70) >> 4);
     if (seg)
         i = (i + 0x100) << (seg - 1);