From db9235657741ce3fa5b9226f55d780304320ef8c Mon Sep 17 00:00:00 2001
From: Yaowu Xu <yaowu@google.com>
Date: Fri, 20 Sep 2013 16:14:37 -0700
Subject: [PATCH] change to prevent computatio of log(0.0)

Change-Id: I5759f309f94a2b5c1297e6db3735c52986d3ecb2
---
 vp8/encoder/firstpass.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vp8/encoder/firstpass.c b/vp8/encoder/firstpass.c
index 8548e7476..968c7f365 100644
--- a/vp8/encoder/firstpass.c
+++ b/vp8/encoder/firstpass.c
@@ -909,7 +909,10 @@ extern const int vp8_bits_per_mb[2][QINDEX_RANGE];
 
 static double bitcost( double prob )
 {
-    return -(log( prob ) / log( 2.0 ));
+  if (prob > 0.000122)
+    return -log(prob) / log(2.0);
+  else
+    return 13.0;
 }
 static int64_t estimate_modemvcost(VP8_COMP *cpi,
                                      FIRSTPASS_STATS * fpstats)
-- 
2.40.0