Index: src/effects/pitchshift.c
===================================================================
--- src/effects/pitchshift.c	(revision 80b5bbd3d2deadcf448827a9daa043cb9c89d66e)
+++ src/effects/pitchshift.c	(revision 80b5bbd3d2deadcf448827a9daa043cb9c89d66e)
@@ -0,0 +1,178 @@
+/*
+  Copyright (C) 2016 Paul Brossier <piem@aubio.org>
+
+  This file is part of aubio.
+
+  aubio is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  aubio is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "config.h"
+#include "aubio_priv.h"
+#include "fvec.h"
+#include "effects/pitchshift.h"
+
+#ifdef HAVE_RUBBERBAND
+
+#include "rubberband/rubberband-c.h"
+
+/** generic pitch shifting structure */
+struct _aubio_pitchshift_t
+{
+  uint_t samplerate;              /**< samplerate */
+  uint_t hopsize;                 /**< hop size */
+  smpl_t timeratio;               /**< time ratio */
+  smpl_t pitchscale;              /**< pitch scale */
+
+  RubberBandState rb;
+  RubberBandOptions rboptions;
+};
+
+aubio_pitchshift_t *
+new_aubio_pitchshift (const char_t * mode,
+    smpl_t pitchscale, uint_t hopsize, uint_t samplerate)
+{
+  aubio_pitchshift_t *p = AUBIO_NEW (aubio_pitchshift_t);
+  int available = 0; unsigned int latency = 0;
+  p->samplerate = samplerate;
+  if (strcmp (mode, "default") != 0) {
+    AUBIO_ERR ("unknown pitch shifting method %s\n", mode);
+    goto beach;
+  }
+  //p->mode = pitch_type;
+  p->hopsize = hopsize;
+  p->timeratio = 1.;
+  p->pitchscale = pitchscale;
+
+  p->rboptions = RubberBandOptionProcessRealTime || RubberBandOptionPitchHighConsistency;
+  p->rboptions = p->rboptions || RubberBandOptionTransientsCrisp;
+  p->rb = rubberband_new(samplerate, 1, p->rboptions, p->timeratio, p->pitchscale);
+  rubberband_set_max_process_size(p->rb, p->hopsize * 4);
+  //rubberband_set_debug_level(p->rb, 10);
+
+  latency = MAX(rubberband_get_latency(p->rb), p->hopsize);
+
+  // warm up
+  fvec_t *zeros = new_fvec(p->hopsize);
+  while (available <= (int)latency) {
+    rubberband_process(p->rb, (const float* const*)&(zeros->data), p->hopsize, 0);
+    available = rubberband_available(p->rb);
+#if 0
+    int samples_required = rubberband_get_samples_required(p->rb);
+    AUBIO_DBG("pitchshift: warmup "
+        "samples_required: %d, available: %d, hopsize: %d, latency: %d\n",
+        samples_required, available, p->hopsize, latency);
+#endif
+  }
+  del_fvec(zeros);
+
+  return p;
+
+beach:
+  del_aubio_pitchshift(p);
+  return NULL;
+}
+
+void
+del_aubio_pitchshift (aubio_pitchshift_t * p)
+{
+  if (p->rb) {
+    rubberband_delete(p->rb);
+  }
+  AUBIO_FREE (p);
+}
+
+uint_t
+aubio_pitchshift_set_pitchscale (aubio_pitchshift_t * p, smpl_t pitchscale)
+{
+  if (pitchscale >= 0.0625  && pitchscale <= 4.) {
+    p->pitchscale = pitchscale;
+    rubberband_set_pitch_scale(p->rb, p->pitchscale);
+    return AUBIO_OK;
+  } else {
+    AUBIO_ERR("pitchshift: could not set pitchscale to %.2f\n", pitchscale);
+    return AUBIO_FAIL;
+  }
+}
+
+smpl_t
+aubio_pitchshift_get_pitchscale (aubio_pitchshift_t * p)
+{
+  return p->pitchscale;
+}
+
+uint_t
+aubio_pitchshift_set_transpose(aubio_pitchshift_t * p, smpl_t transpose)
+{
+  if (transpose >= -24. && transpose <= 24.) {
+    smpl_t pitchscale = POW(2., transpose / 12.);
+    return aubio_pitchshift_set_pitchscale(p, pitchscale);
+  } else {
+    AUBIO_ERR("pitchshift: could not set transpose to %.2f\n", transpose);
+    return AUBIO_FAIL;
+  }
+}
+
+smpl_t
+aubio_pitchshift_get_transpose(aubio_pitchshift_t * p)
+{
+  return 12. * LOG(p->pitchscale) / LOG(2.0);
+}
+
+void
+aubio_pitchshift_do (aubio_pitchshift_t * p, const fvec_t * in, fvec_t * out)
+{
+  int output = 0;
+  // this may occur when RubberBandStretcher initialPitchScale is changed
+  while (rubberband_available(p->rb) <= (int)p->hopsize) {
+    //AUBIO_WRN("pitchshift: catching up, only %d available\n", rubberband_available(p->rb));
+    rubberband_process(p->rb, (const float* const*)&(in->data), 0, output);
+  }
+  rubberband_process(p->rb, (const float* const*)&(in->data), p->hopsize, output);
+  rubberband_retrieve(p->rb, (float* const*)&(out->data), p->hopsize);
+}
+
+#else
+struct _aubio_pitchshift_t
+{
+  void *dummy;
+};
+
+void aubio_pitchshift_do (aubio_pitchshift_t * o UNUSED, const fvec_t * in UNUSED,
+    fvec_t * out UNUSED) {
+}
+
+void del_aubio_pitchshift (aubio_pitchshift_t * o UNUSED) {}
+
+aubio_pitchshift_t *new_aubio_pitchshift (const char_t * method UNUSED,
+    smpl_t pitchscale UNUSED, uint_t hop_size UNUSED, uint_t samplerate UNUSED)
+{
+  AUBIO_ERR ("aubio was not compiled with rubberband\n");
+  return NULL;
+}
+uint_t aubio_pitchshift_set_pitchscale (aubio_pitchshift_t * o UNUSED, smpl_t pitchscale UNUSED)
+{
+  return AUBIO_FAIL;
+}
+smpl_t aubio_pitchshift_get_pitchscale (aubio_pitchshift_t * o UNUSED)
+{
+  return 1.;
+}
+uint_t aubio_pitchshift_set_transpose (aubio_pitchshift_t * o UNUSED, smpl_t transpose UNUSED) {
+  return AUBIO_FAIL;
+}
+smpl_t aubio_pitchshift_get_transpose (aubio_pitchshift_t * o UNUSED) {
+  return 0.;
+}
+#endif /* HAVE_RUBBERBAND */
Index: src/effects/pitchshift.h
===================================================================
--- src/effects/pitchshift.h	(revision 80b5bbd3d2deadcf448827a9daa043cb9c89d66e)
+++ src/effects/pitchshift.h	(revision 80b5bbd3d2deadcf448827a9daa043cb9c89d66e)
@@ -0,0 +1,112 @@
+/*
+  Copyright (C) 2016 Paul Brossier <piem@aubio.org>
+
+  This file is part of aubio.
+
+  aubio is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  aubio is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#ifndef AUBIO_PITCHSHIFT_H
+#define AUBIO_PITCHSHIFT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \file
+
+  Pitch shifting object
+
+  This file ...
+
+  \example effects/test-pitchshift.c
+
+*/
+
+/** pitch shifting object */
+typedef struct _aubio_pitchshift_t aubio_pitchshift_t;
+
+/** execute pitch shifting on an input signal frame
+
+  \param o pitch shifting object as returned by new_aubio_pitchshift()
+  \param in input signal of size [hop_size]
+  \param out output pitch candidates of size [1]
+
+*/
+void aubio_pitchshift_do (aubio_pitchshift_t * o, const fvec_t * in, fvec_t * out);
+
+/** deletion of the pitch shifting object
+
+  \param o pitch shifting object as returned by new_aubio_pitchshift()
+
+*/
+void del_aubio_pitchshift (aubio_pitchshift_t * o);
+
+/** creation of the pitch shifting object
+
+  \param method set pitch shifting algorithm
+  \param buf_size size of the input buffer to analyse
+  \param hop_size step size between two consecutive analysis instant
+  \param samplerate sampling rate of the signal
+
+  \return newly created ::aubio_pitchshift_t
+
+*/
+aubio_pitchshift_t *new_aubio_pitchshift (const char_t * method,
+    smpl_t pitchscale, uint_t hop_size, uint_t samplerate);
+
+/** set the pitch scale of the pitch shifting object
+
+  \param o pitch shifting object as returned by new_aubio_pitchshift()
+  \param pitchscale new pitch scale of the pitch shifting object
+
+  \return 0 if successfull, non-zero otherwise
+
+*/
+uint_t aubio_pitchshift_set_pitchscale (aubio_pitchshift_t * o, smpl_t pitchscale);
+
+/** set the pitchscale of the pitch shifting object
+
+  \param o pitch shifting object as returned by ::new_aubio_pitchshift()
+
+  \return pitchscale of the pitch shifting object
+
+*/
+smpl_t aubio_pitchshift_get_pitchscale (aubio_pitchshift_t * o);
+
+/** set the transposition of the pitch shifting object
+
+  \param o pitch shifting object as returned by new_aubio_pitchshift()
+  \param transpose new pitch transposition of the pitch shifting object
+
+  \return 0 if successfull, non-zero otherwise
+
+*/
+uint_t aubio_pitchshift_set_transpose (aubio_pitchshift_t * o, smpl_t transpose);
+
+/** set the transposition of the pitch shifting object
+
+  \param o pitch shifting object as returned by ::new_aubio_pitchshift()
+
+  \return transposition of the pitch shifting object
+
+*/
+smpl_t aubio_pitchshift_get_transpose (aubio_pitchshift_t * o);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AUBIO_PITCHSHIFT_H */
