*
* @return dot product = sum of elementwise products
*/
-int ff_dot_product(const int16_t *a, const int16_t *b, int length);
+int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length);
/**
- * returns the dot product.
+ * Return the dot product.
* @param a input data array
* @param b input data array
* @param length number of elements