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tempo.{c,h}: add aubio_tempo_get_bpm, which for now just calls aubio_beattracking_get_bpm, also update test-tempo.c

--- a/examples/tests/test-tempo.c

+++ b/examples/tests/test-tempo.c

@@ -9,8 +9,14 @@

         aubio_tempo_t * o  = new_aubio_tempo(aubio_onset_complex, win_s, win_s/4, channels);

         uint_t i = 0;

+        smpl_t curtempo;

+

         while (i < 1000) {

           aubio_tempo(o,in,out);

+          curtempo = aubio_tempo_get_bpm(o);

+          if (curtempo != 0.) {

+            fprintf(stdout,"%f\n",curtempo);

+          }

           i++;

         };

--- a/src/tempo.c

+++ b/src/tempo.c

@@ -123,6 +123,10 @@

   return o;

 }

+smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {

+  return aubio_beattracking_get_bpm(o->bt);

+}

+

 void del_aubio_tempo (aubio_tempo_t *o)

 {

   del_aubio_onsetdetection(o->od);

--- a/src/tempo.h

+++ b/src/tempo.h

@@ -49,6 +49,15 @@

 /** set tempo detection peak picking threshold  */

 void aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold);

+/** get current tempo

+

+  \param bt beat tracking object

+

+  Returns the currently observed tempo, or 0 if no consistent value is found

+

+*/

+smpl_t aubio_tempo_get_bpm(aubio_tempo_t * bt);

+

 /** delete tempo detection object */

 void del_aubio_tempo(aubio_tempo_t * o);