From: Måns Rullgård <mans@mansr.com>
Date: Sun, 21 Feb 2010 21:48:37 +0000 (+0000)
Subject: Add zero_extend() function
X-Git-Tag: v0.6~1180
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=48960b8f2496c03600e9d139521a1cf8f4a07e55;p=platform%2Fupstream%2Flibav.git

Add zero_extend() function

Originally committed as revision 21947 to svn://svn.ffmpeg.org/ffmpeg/trunk
---

diff --git a/libavcodec/mathops.h b/libavcodec/mathops.h
index 85eac48..149910b 100644
--- a/libavcodec/mathops.h
+++ b/libavcodec/mathops.h
@@ -122,6 +122,13 @@ static inline av_const int sign_extend(int val, unsigned bits)
 }
 #endif
 
+#ifndef zero_extend
+static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
+{
+    return (val << (INT_BIT - bits)) >> (INT_BIT - bits);
+}
+#endif
+
 #ifndef COPY3_IF_LT
 #define COPY3_IF_LT(x, y, a, b, c, d)\
 if ((y) < (x)) {\