Add dot_product function for use by the G.723.1 decoder

1 files changed, 11 insertions, 0 deletions

diff --git a/libavcodec/celp_math.h b/libavcodec/celp_math.h
index 4cf656fb7e..476e668795 100644
--- a/libavcodec/celp_math.h
+++ b/libavcodec/celp_math.h
@@ -64,6 +64,17 @@ static inline int bidir_sal(int value, int offset)
 }
 
 /**
+ * returns the dot product of 2 int16_t vectors.
+ * @param a input data array
+ * @param b input data array
+ * @param length number of elements
+ * @param shift the result is scaled by 2^shift
+ *
+ * @return dot product = sum of elementwise products
+ */
+int ff_dot_product(const int16_t *a, const int16_t *b, int length, int shift);
+
+/**
  * returns the dot product.
  * @param a input data array
  * @param b input data array