add a new av_clip_int16() function to libavutil

Originally committed as revision 10076 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 11 insertions, 0 deletions

diff --git a/libavutil/common.h b/libavutil/common.h
index bbade55bfa..9550403503 100644
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -192,6 +192,17 @@ static inline uint8_t av_clip_uint8(int a)
     else          return a;
 }
 
+/**
+ * clip a signed integer value into the -32768,32767 range
+ * @param a value to clip
+ * @return clipped value
+ */
+static inline int16_t av_clip_int16(int a)
+{
+    if ((a+32768) & ~65535) return (a>>31) ^ 32767;
+    else                    return a;
+}
+
 /* math */
 int64_t ff_gcd(int64_t a, int64_t b);