Add in tree aubio

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

deps/aubio/src/pitch/pitchfcomb.c

@@ -0,0 +1,144 @@
+/*
+  Copyright (C) 2004, 2005  Mario Lang <mlang@delysid.org>
+  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/>.
+
+*/
+
+#include "aubio_priv.h"
+#include "fvec.h"
+#include "cvec.h"
+#include "mathutils.h"
+#include "musicutils.h"
+#include "spectral/fft.h"
+#include "pitch/pitchfcomb.h"
+
+#define MAX_PEAKS 8
+
+typedef struct
+{
+  smpl_t bin;
+  smpl_t db;
+} aubio_fpeak_t;
+
+struct _aubio_pitchfcomb_t
+{
+  uint_t fftSize;
+  uint_t stepSize;
+  uint_t rate;
+  fvec_t *winput;
+  fvec_t *win;
+  cvec_t *fftOut;
+  fvec_t *fftLastPhase;
+  aubio_fft_t *fft;
+};
+
+aubio_pitchfcomb_t *
+new_aubio_pitchfcomb (uint_t bufsize, uint_t hopsize)
+{
+  aubio_pitchfcomb_t *p = AUBIO_NEW (aubio_pitchfcomb_t);
+  p->fftSize = bufsize;
+  p->stepSize = hopsize;
+  p->fft = new_aubio_fft (bufsize);
+  if (!p->fft) goto beach;
+  p->winput = new_fvec (bufsize);
+  p->fftOut = new_cvec (bufsize);
+  p->fftLastPhase = new_fvec (bufsize);
+  p->win = new_aubio_window ("hanning", bufsize);
+  return p;
+
+beach:
+  AUBIO_FREE(p);
+  return NULL;
+}
+
+/* input must be stepsize long */
+void
+aubio_pitchfcomb_do (aubio_pitchfcomb_t * p, const fvec_t * input, fvec_t * output)
+{
+  uint_t k, l, maxharm = 0;
+  smpl_t phaseDifference = TWO_PI * (smpl_t) p->stepSize / (smpl_t) p->fftSize;
+  aubio_fpeak_t peaks[MAX_PEAKS];
+
+  for (k = 0; k < MAX_PEAKS; k++) {
+    peaks[k].db = -200.;
+    peaks[k].bin = 0.;
+  }
+
+  for (k = 0; k < input->length; k++) {
+    p->winput->data[k] = p->win->data[k] * input->data[k];
+  }
+  aubio_fft_do (p->fft, p->winput, p->fftOut);
+
+  for (k = 0; k <= p->fftSize / 2; k++) {
+    smpl_t
+        magnitude =
+        20. * LOG10 (2. * p->fftOut->norm[k] / (smpl_t) p->fftSize),
+        phase = p->fftOut->phas[k], tmp, bin;
+
+    /* compute phase difference */
+    tmp = phase - p->fftLastPhase->data[k];
+    p->fftLastPhase->data[k] = phase;
+
+    /* subtract expected phase difference */
+    tmp -= (smpl_t) k *phaseDifference;
+
+    /* map delta phase into +/- Pi interval */
+    tmp = aubio_unwrap2pi (tmp);
+
+    /* get deviation from bin frequency from the +/- Pi interval */
+    tmp = p->fftSize / (smpl_t) p->stepSize * tmp / (TWO_PI);
+
+    /* compute the k-th partials' true bin */
+    bin = (smpl_t) k + tmp;
+
+    if (bin > 0.0 && magnitude > peaks[0].db) {       // && magnitude < 0) {
+      memmove (peaks + 1, peaks, sizeof (aubio_fpeak_t) * (MAX_PEAKS - 1));
+      peaks[0].bin = bin;
+      peaks[0].db = magnitude;
+    }
+  }
+
+  k = 0;
+  for (l = 1; l < MAX_PEAKS && peaks[l].bin > 0.0; l++) {
+    sint_t harmonic;
+    for (harmonic = 5; harmonic > 1; harmonic--) {
+      if (peaks[0].bin / peaks[l].bin < harmonic + .02 &&
+          peaks[0].bin / peaks[l].bin > harmonic - .02) {
+        if (harmonic > (sint_t) maxharm && peaks[0].db < peaks[l].db / 2) {
+          maxharm = harmonic;
+          k = l;
+        }
+      }
+    }
+  }
+  output->data[0] = peaks[k].bin;
+  /* quick hack to clean output a bit */
+  if (peaks[k].bin > 5000.)
+    output->data[0] = 0.;
+}
+
+void
+del_aubio_pitchfcomb (aubio_pitchfcomb_t * p)
+{
+  del_cvec (p->fftOut);
+  del_fvec (p->fftLastPhase);
+  del_fvec (p->win);
+  del_fvec (p->winput);
+  del_aubio_fft (p->fft);
+  AUBIO_FREE (p);
+}