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src/onset/peakpick.{c,h}: setters to return uint

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

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

@@ -126,9 +126,9 @@

 }

 /** function added by Miguel Ramirez to return the onset detection amplitude in peakval */

-void aubio_peakpicker_set_threshold(aubio_peakpicker_t * p, smpl_t threshold) {

+uint_t aubio_peakpicker_set_threshold(aubio_peakpicker_t * p, smpl_t threshold) {

 	p->threshold = threshold;

-	return;

+	return AUBIO_OK;

 }

 smpl_t aubio_peakpicker_get_threshold(aubio_peakpicker_t * p) {

@@ -135,9 +135,9 @@

 	return p->threshold;

 }

-void aubio_peakpicker_set_thresholdfn(aubio_peakpicker_t * p, aubio_thresholdfn_t thresholdfn) {

+uint_t aubio_peakpicker_set_thresholdfn(aubio_peakpicker_t * p, aubio_thresholdfn_t thresholdfn) {

 	p->thresholdfn = thresholdfn;

-	return;

+	return AUBIO_OK;

 }

 aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_peakpicker_t * p) {

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

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

@@ -47,11 +47,11 @@

 void del_aubio_peakpicker(aubio_peakpicker_t * p);

 /** set peak picking threshold */

-void aubio_peakpicker_set_threshold(aubio_peakpicker_t * p, smpl_t threshold);

+uint_t aubio_peakpicker_set_threshold(aubio_peakpicker_t * p, smpl_t threshold);

 /** get peak picking threshold */

 smpl_t aubio_peakpicker_get_threshold(aubio_peakpicker_t * p);

 /** set peak picker thresholding function */

-void aubio_peakpicker_set_thresholdfn(aubio_peakpicker_t * p, aubio_thresholdfn_t thresholdfn);

+uint_t aubio_peakpicker_set_thresholdfn(aubio_peakpicker_t * p, aubio_thresholdfn_t thresholdfn);

 /** get peak picker thresholding function */

 aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_peakpicker_t * p);