From 291fd18a6ede0fc6a6d35c9a98af6ae7fd6d6117 Mon Sep 17 00:00:00 2001
From: Alex Converse <alex.converse@gmail.com>
Date: Fri, 10 Jul 2009 19:20:06 +0000
Subject: Add a log2 replacement for systems that haven't quite caught up with
 the C99 standard library.

Originally committed as revision 19395 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavutil/internal.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'libavutil/internal.h')

diff --git a/libavutil/internal.h b/libavutil/internal.h
index a80ea2470b..1012f1c690 100644
--- a/libavutil/internal.h
+++ b/libavutil/internal.h
@@ -265,6 +265,13 @@ static av_always_inline av_const long long llrint(double x)
 }
 #endif /* HAVE_LLRINT */
 
+#if !HAVE_LOG2
+static av_always_inline av_const double log2(double x)
+{
+    return log(x) * 1.44269504088896340736;
+}
+#endif /* HAVE_LOG2 */
+
 #if !HAVE_LRINT
 static av_always_inline av_const long int lrint(double x)
 {
-- 
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