144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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Copyright (C) 2004, 2005 Mario Lang <mlang@delysid.org>
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Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
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This file is part of aubio.
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aubio is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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aubio is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with aubio. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "aubio_priv.h"
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#include "fvec.h"
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#include "cvec.h"
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#include "mathutils.h"
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#include "musicutils.h"
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#include "spectral/fft.h"
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#include "pitch/pitchfcomb.h"
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#define MAX_PEAKS 8
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typedef struct
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{
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smpl_t bin;
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smpl_t db;
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} aubio_fpeak_t;
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struct _aubio_pitchfcomb_t
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{
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uint_t fftSize;
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uint_t stepSize;
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uint_t rate;
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fvec_t *winput;
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fvec_t *win;
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cvec_t *fftOut;
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fvec_t *fftLastPhase;
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aubio_fft_t *fft;
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};
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aubio_pitchfcomb_t *
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new_aubio_pitchfcomb (uint_t bufsize, uint_t hopsize)
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{
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aubio_pitchfcomb_t *p = AUBIO_NEW (aubio_pitchfcomb_t);
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p->fftSize = bufsize;
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p->stepSize = hopsize;
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p->fft = new_aubio_fft (bufsize);
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if (!p->fft) goto beach;
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p->winput = new_fvec (bufsize);
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p->fftOut = new_cvec (bufsize);
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p->fftLastPhase = new_fvec (bufsize);
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p->win = new_aubio_window ("hanning", bufsize);
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return p;
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beach:
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AUBIO_FREE(p);
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return NULL;
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}
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/* input must be stepsize long */
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void
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aubio_pitchfcomb_do (aubio_pitchfcomb_t * p, const fvec_t * input, fvec_t * output)
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{
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uint_t k, l, maxharm = 0;
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smpl_t phaseDifference = TWO_PI * (smpl_t) p->stepSize / (smpl_t) p->fftSize;
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aubio_fpeak_t peaks[MAX_PEAKS];
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for (k = 0; k < MAX_PEAKS; k++) {
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peaks[k].db = -200.;
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peaks[k].bin = 0.;
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}
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for (k = 0; k < input->length; k++) {
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p->winput->data[k] = p->win->data[k] * input->data[k];
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}
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aubio_fft_do (p->fft, p->winput, p->fftOut);
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for (k = 0; k <= p->fftSize / 2; k++) {
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smpl_t
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magnitude =
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20. * LOG10 (2. * p->fftOut->norm[k] / (smpl_t) p->fftSize),
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phase = p->fftOut->phas[k], tmp, bin;
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/* compute phase difference */
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tmp = phase - p->fftLastPhase->data[k];
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p->fftLastPhase->data[k] = phase;
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/* subtract expected phase difference */
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tmp -= (smpl_t) k *phaseDifference;
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/* map delta phase into +/- Pi interval */
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tmp = aubio_unwrap2pi (tmp);
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/* get deviation from bin frequency from the +/- Pi interval */
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tmp = p->fftSize / (smpl_t) p->stepSize * tmp / (TWO_PI);
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/* compute the k-th partials' true bin */
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bin = (smpl_t) k + tmp;
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if (bin > 0.0 && magnitude > peaks[0].db) { // && magnitude < 0) {
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memmove (peaks + 1, peaks, sizeof (aubio_fpeak_t) * (MAX_PEAKS - 1));
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peaks[0].bin = bin;
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peaks[0].db = magnitude;
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}
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}
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k = 0;
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for (l = 1; l < MAX_PEAKS && peaks[l].bin > 0.0; l++) {
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sint_t harmonic;
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for (harmonic = 5; harmonic > 1; harmonic--) {
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if (peaks[0].bin / peaks[l].bin < harmonic + .02 &&
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peaks[0].bin / peaks[l].bin > harmonic - .02) {
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if (harmonic > (sint_t) maxharm && peaks[0].db < peaks[l].db / 2) {
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maxharm = harmonic;
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k = l;
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}
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}
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}
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}
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output->data[0] = peaks[k].bin;
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/* quick hack to clean output a bit */
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if (peaks[k].bin > 5000.)
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output->data[0] = 0.;
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}
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void
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del_aubio_pitchfcomb (aubio_pitchfcomb_t * p)
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{
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del_cvec (p->fftOut);
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del_fvec (p->fftLastPhase);
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del_fvec (p->win);
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del_fvec (p->winput);
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del_aubio_fft (p->fft);
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AUBIO_FREE (p);
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}
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