[SCM] libav/experimental: Document av_gcd().

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 03703cb3d10b03f3ac8d599c9935a5285b411966
Author: Michael Niedermayer <michaelni at gmx.at>
Date:   Sun Dec 27 12:20:06 2009 +0000

    Document av_gcd().
    
    Originally committed as revision 20935 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavutil/mathematics.h b/libavutil/mathematics.h
index cb35910..852e2bf 100644
--- a/libavutil/mathematics.h
+++ b/libavutil/mathematics.h
@@ -56,6 +56,11 @@ enum AVRounding {
     AV_ROUND_NEAR_INF = 5, ///< Round to nearest and halfway cases away from zero.
 };
 
+/**
+ * Returns the greatest common divisor of a and b.
+ * If either a or b are 0 or either or both are <0 then behavior is
+ * undefined.
+ */
 int64_t av_const av_gcd(int64_t a, int64_t b);
 
 /**

-- 
Libav/FFmpeg packaging