Add ff_dot_productf() to celp_math.{c,h}

Part of the QCELP patch by Kenan Gillet, kenan.gillet gmail com

Originally committed as revision 15753 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 10 insertions, 0 deletions

diff --git a/libavcodec/celp_math.h b/libavcodec/celp_math.h
index 029b5310af..ce0726fba1 100644
--- a/libavcodec/celp_math.h
+++ b/libavcodec/celp_math.h
@@ -83,4 +83,14 @@ static inline int bidir_sal(int value, int offset)
     else           return value <<  offset;
 }
 
+/**
+ * returns the dot product.
+ * @param a input data array
+ * @param b input data array
+ * @param length number of elements
+ *
+ * @return dot product = sum of elementwise products
+ */
+extern float ff_dot_productf(const float* a, const float* b, int length);
+
 #endif /* AVCODEC_CELP_MATH_H */