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add aubio_cleanup to clean fftw cached memory
add aubio_cleanup to clean fftw cached memory

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -22,6 +22,7 @@

 #include "aubio_priv.h"

 #include "sample.h"

 #include "mathutils.h"

+#include "config.h"

 void aubio_window(smpl_t *w, uint_t size, aubio_window_type wintype) {

   uint_t i;

@@ -453,3 +454,13 @@

         }

 }

+void aubio_cleanup(void)

+{

+#if FFTW3_SUPPORT

+        fftw_cleanup();

+#else

+#if FFTW3F_SUPPORT

+        fftwf_cleanup();

+#endif

+#endif

+}

--- a/src/mathutils.h

+++ b/src/mathutils.h

@@ -245,6 +245,14 @@

  * calculate normalised autocorrelation function

  */

 void aubio_autocorr(fvec_t * input, fvec_t * output);

+/**

+ * clean up cached memory at the end of program

+ *

+ * use this function at the end of programs to purge all

+ * cached memory. so far this function is only used to clean

+ * fftw cache.

+ */

+void aubio_cleanup(void);

 #ifdef __cplusplus

 }