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src/effects/timestretch.h: add _seek method

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

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

@@ -156,6 +156,16 @@

 */

 smpl_t aubio_timestretch_get_transpose (aubio_timestretch_t * o);

+/** seek to a posisition the transposition of the time stretching object, in semitones

+

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

+  \param pos position to seek to, in frames

+

+  \return transposition of the time stretching object, in semitones

+

+*/

+uint_t aubio_timestretch_seek(aubio_timestretch_t * o, uint_t pos);

+

 #ifdef __cplusplus

 }

 #endif

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

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

@@ -86,6 +86,9 @@

   return 0.;

 }

+uint_t aubio_timestretch_seek(aubio_timestretch_t *o UNUSED, uint_t pos UNUSED) {

+  return AUBIO_FAIL;

+}

 // end of dummy implementation

 #endif /* HAVE_RUBBERBAND */

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

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

@@ -208,4 +208,12 @@

   }

 }

+uint_t

+aubio_timestretch_seek (aubio_timestretch_t *p, uint_t pos)

+{

+  p->eof = 0;

+  rubberband_reset(p->rb);

+  return aubio_source_seek(p->source, pos);

+}

+

 #endif