Added spectral centroid

2 files changed, 11 insertions, 1 deletions

diff --git a/xtract/libxtract.h b/xtract/libxtract.h
index f1da9c1..c9e43d2 100644
--- a/xtract/libxtract.h
+++ b/xtract/libxtract.h
@@ -38,7 +38,7 @@ extern "C" {
 #include "xtract_types.h"
 #include "xtract_macros.h"
 
-#define XTRACT_FEATURES 42
+#define XTRACT_FEATURES 43
 #define LOG_LIMIT 10e-10
 #define VERY_BIG_NUMBER 2e10
 #define SR_LIMIT 192000
@@ -52,6 +52,7 @@ enum features_ {
     AVERAGE_DEVIATION,
     SKEWNESS,
     KURTOSIS,
+	CENTROID,
     IRREGULARITY_K,
     IRREGULARITY_J,
     TRISTIMULUS_1,
diff --git a/xtract/xtract_scalar.h b/xtract/xtract_scalar.h
index 6ddea98..bea7298 100644
--- a/xtract/xtract_scalar.h
+++ b/xtract/xtract_scalar.h
@@ -82,6 +82,15 @@ int xtract_skewness(float *data, int N, void *argv,  float *result);
  */
 int xtract_kurtosis(float *data, int N, void *argv,  float *result);
 
+/** \brief Extract the kurtosis of an input vector
+ * 
+ * \param *data: a pointer to the first element in an array of floats represeting a frequency spectrum of size N/2 and a magnitude peak spectrum of size N/2 (This is the output format of xtract_peaks)
+ * \param N: the number of elements to be considered
+ * \param *argv: a pointer to NULL
+ * \param *result: the centroid of the values pointed to by *data
+ */
+int xtract_centroid(float *data, int N, void *argv,  float *result);
+
 /** \brief Calculate the Irregularity of an input vector using a method described by Krimphoff (1994)
  * 
  * \param *data: a pointer to the first element in an array of floats representing the magnitude spectrum of an audio vector