[FFmpeg-cvslog] r13117 - trunk/libavcodec/acelp_math.h

[voroshil]

Author: voroshil
Date: Sun May 11 13:49:25 2008
New Revision: 13117

Log:
Implement bidirectional (positive offset - left, negative - right)
signed shift for ACELP-based codecs.



Modified:
   trunk/libavcodec/acelp_math.h

Modified: trunk/libavcodec/acelp_math.h
==============================================================================
--- trunk/libavcodec/acelp_math.h	(original)
+++ trunk/libavcodec/acelp_math.h	Sun May 11 13:49:25 2008
@@ -72,4 +72,17 @@ static int sum_of_squares(const int16_t*
     return sum;
 }
 
+/**
+ * \brief Shift value left or right depending on sign of offset parameter.
+ * \param value value to shift
+ * \param offset shift offset
+ *
+ * \return value << offset, if offset>=0; value >> -offset - otherwise
+ */
+static inline int bidir_sal(int value, int offset)
+{
+    if(offset < 0) return value >> -offset;
+    else           return value <<  offset;
+}
+
 #endif /* FFMPEG_ACELP_MATH_H */