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src/effects/timestretch.h: add get_samplerate method

--- a/src/effects/timestretch.h

+++ b/src/effects/timestretch.h

@@ -84,6 +84,18 @@

 */

 uint_t aubio_timestretch_get_latency (aubio_timestretch_t * o);

+/** get the samplerate of the time stretching object

+

+  Call after new_aubio_timestretch() was called with 0 to match the original

+  samplerate of the input file.

+

+  \param o time stretching object as returned by new_aubio_timestretch()

+

+  \return samplerate of the time stretching object

+

+ */

+uint_t aubio_timestretch_get_samplerate (aubio_timestretch_t * o);

+

 /** set the stretching ratio of the time stretching object

   \param o time stretching object as returned by new_aubio_timestretch()

--- a/src/effects/timestretch_dummy.c

+++ b/src/effects/timestretch_dummy.c

@@ -65,6 +65,10 @@

   return AUBIO_FAIL;

 }

+uint_t aubio_timestretch_get_samplerate (aubio_timestretch_t * o UNUSED) {

+  return 0;

+}

+

 smpl_t aubio_timestretch_get_pitchscale (aubio_timestretch_t * o UNUSED)

 {

   return 1.;

--- a/src/effects/timestretch_rubberband.c

+++ b/src/effects/timestretch_rubberband.c

@@ -118,6 +118,12 @@

   AUBIO_FREE (p);

 }

+uint_t

+aubio_timestretch_get_samplerate (aubio_timestretch_t * p)

+{

+  return p->samplerate;

+}

+

 uint_t aubio_timestretch_get_latency (aubio_timestretch_t * p) {

   return rubberband_get_latency(p->rb);

 }