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/*
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->winput = new_fvec (bufsize);
p->fftOut = new_cvec (bufsize);
p->fftLastPhase = new_fvec (bufsize);
p->fft = new_aubio_fft (bufsize);
p->win = new_aubio_window ("hanning", bufsize);
return p;
}
/* 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);
}
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