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src/onset/onset.{c,h}: added get_descriptor and get_thresholded_descriptor

--- a/src/onset/onset.c

+++ b/src/onset/onset.c

@@ -72,6 +72,15 @@

   return;

 }

+smpl_t aubio_onset_get_descriptor(aubio_onset_t * o) {

+    return o->of->data[0];

+}

+

+smpl_t aubio_onset_get_thresholded_descriptor(aubio_onset_t * o) {

+    fvec_t * thresholded = aubio_peakpicker_get_thresholded_input(o->pp);

+    return thresholded->data[0];

+}

+

 uint_t aubio_onset_set_silence(aubio_onset_t * o, smpl_t silence) {

   o->silence = silence;

   return AUBIO_OK;

--- a/src/onset/onset.h

+++ b/src/onset/onset.h

@@ -72,6 +72,22 @@

 */

 uint_t aubio_onset_set_silence(aubio_onset_t * o, smpl_t silence);

+/** get onset detection function

+

+  \param o onset detection object as returned by new_aubio_onset

+  \return the current value of the descriptor

+

+*/

+smpl_t aubio_onset_get_descriptor ( aubio_onset_t *o);

+

+/** get thresholded onset detection function

+

+  \param o onset detection object as returned by new_aubio_onset

+  \return the value of the thresholded descriptor

+

+*/

+smpl_t aubio_onset_get_thresholded_descriptor ( aubio_onset_t *o);

+

 /** set onset detection peak picking threshold 

   \param o onset detection object as returned by new_aubio_onset