Add in tree aubio

Signed-off-by: falkTX <falktx@falktx.com>

deps/aubio/src/pitch/pitchyin.c

@@ -0,0 +1,189 @@
+/*
+  Copyright (C) 2003-2009 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/>.
+
+*/
+
+/* This algorithm was developed by A. de Cheveigné and H. Kawahara and
+ * published in:
+ * 
+ * de Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
+ * estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.  
+ *
+ * see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
+ */
+
+#include "aubio_priv.h"
+#include "fvec.h"
+#include "mathutils.h"
+#include "pitch/pitchyin.h"
+
+struct _aubio_pitchyin_t
+{
+  fvec_t *yin;
+  smpl_t tol;
+  uint_t peak_pos;
+};
+
+#if 0
+/** compute difference function
+
+  \param input input signal
+  \param yinbuf output buffer to store difference function (half shorter than input)
+
+*/
+void aubio_pitchyin_diff (fvec_t * input, fvec_t * yinbuf);
+
+/** in place computation of the YIN cumulative normalised function
+
+  \param yinbuf input signal (a square difference function), also used to store function
+
+*/
+void aubio_pitchyin_getcum (fvec_t * yinbuf);
+
+/** detect pitch in a YIN function
+
+  \param yinbuf input buffer as computed by aubio_pitchyin_getcum
+
+*/
+uint_t aubio_pitchyin_getpitch (const fvec_t * yinbuf);
+#endif
+
+aubio_pitchyin_t *
+new_aubio_pitchyin (uint_t bufsize)
+{
+  aubio_pitchyin_t *o = AUBIO_NEW (aubio_pitchyin_t);
+  o->yin = new_fvec (bufsize / 2);
+  o->tol = 0.15;
+  o->peak_pos = 0;
+  return o;
+}
+
+void
+del_aubio_pitchyin (aubio_pitchyin_t * o)
+{
+  del_fvec (o->yin);
+  AUBIO_FREE (o);
+}
+
+#if 0
+/* outputs the difference function */
+void
+aubio_pitchyin_diff (fvec_t * input, fvec_t * yin)
+{
+  uint_t j, tau;
+  smpl_t tmp;
+  for (tau = 0; tau < yin->length; tau++) {
+    yin->data[tau] = 0.;
+  }
+  for (tau = 1; tau < yin->length; tau++) {
+    for (j = 0; j < yin->length; j++) {
+      tmp = input->data[j] - input->data[j + tau];
+      yin->data[tau] += SQR (tmp);
+    }
+  }
+}
+
+/* cumulative mean normalized difference function */
+void
+aubio_pitchyin_getcum (fvec_t * yin)
+{
+  uint_t tau;
+  smpl_t tmp = 0.;
+  yin->data[0] = 1.;
+  //AUBIO_DBG("%f\t",yin->data[0]);
+  for (tau = 1; tau < yin->length; tau++) {
+    tmp += yin->data[tau];
+    yin->data[tau] *= tau / tmp;
+    //AUBIO_DBG("%f\t",yin->data[tau]);
+  }
+  //AUBIO_DBG("\n");
+}
+
+uint_t
+aubio_pitchyin_getpitch (const fvec_t * yin)
+{
+  uint_t tau = 1;
+  do {
+    if (yin->data[tau] < 0.1) {
+      while (yin->data[tau + 1] < yin->data[tau]) {
+        tau++;
+      }
+      return tau;
+    }
+    tau++;
+  } while (tau < yin->length);
+  //AUBIO_DBG("No pitch found");
+  return 0;
+}
+#endif
+
+/* all the above in one */
+void
+aubio_pitchyin_do (aubio_pitchyin_t * o, const fvec_t * input, fvec_t * out)
+{
+  const smpl_t tol = o->tol;
+  fvec_t* yin = o->yin;
+  const smpl_t *input_data = input->data;
+  const uint_t length = yin->length;
+  smpl_t *yin_data = yin->data;
+  uint_t j, tau;
+  sint_t period;
+  smpl_t tmp, tmp2 = 0.;
+
+  yin_data[0] = 1.;
+  for (tau = 1; tau < length; tau++) {
+    yin_data[tau] = 0.;
+    for (j = 0; j < length; j++) {
+      tmp = input_data[j] - input_data[j + tau];
+      yin_data[tau] += SQR (tmp);
+    }
+    tmp2 += yin_data[tau];
+    if (tmp2 != 0) {
+      yin->data[tau] *= tau / tmp2;
+    } else {
+      yin->data[tau] = 1.;
+    }
+    period = tau - 3;
+    if (tau > 4 && (yin_data[period] < tol) &&
+        (yin_data[period] < yin_data[period + 1])) {
+      o->peak_pos = (uint_t)period;
+      out->data[0] = fvec_quadratic_peak_pos (yin, o->peak_pos);
+      return;
+    }
+  }
+  o->peak_pos = (uint_t)fvec_min_elem (yin);
+  out->data[0] = fvec_quadratic_peak_pos (yin, o->peak_pos);
+}
+
+smpl_t
+aubio_pitchyin_get_confidence (aubio_pitchyin_t * o) {
+  return 1. - o->yin->data[o->peak_pos];
+}
+
+uint_t
+aubio_pitchyin_set_tolerance (aubio_pitchyin_t * o, smpl_t tol)
+{
+  o->tol = tol;
+  return 0;
+}
+
+smpl_t
+aubio_pitchyin_get_tolerance (aubio_pitchyin_t * o)
+{
+  return o->tol;
+}