116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
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Copyright (C) 2013 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 "spectral/fft.h"
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#include "pitch/pitchspecacf.h"
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/** pitch specacf structure */
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struct _aubio_pitchspecacf_t
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{
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fvec_t *win; /**< temporal weighting window */
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fvec_t *winput; /**< windowed spectrum */
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aubio_fft_t *fft; /**< fft object to compute*/
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fvec_t *fftout; /**< Fourier transform output */
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fvec_t *sqrmag; /**< square magnitudes */
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fvec_t *acf; /**< auto correlation function */
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smpl_t tol; /**< tolerance */
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smpl_t confidence; /**< confidence */
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};
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aubio_pitchspecacf_t *
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new_aubio_pitchspecacf (uint_t bufsize)
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{
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aubio_pitchspecacf_t *p = AUBIO_NEW (aubio_pitchspecacf_t);
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p->fft = new_aubio_fft (bufsize);
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if (!p->fft) goto beach;
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p->win = new_aubio_window ("hanningz", bufsize);
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p->winput = new_fvec (bufsize);
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p->fftout = new_fvec (bufsize);
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p->sqrmag = new_fvec (bufsize);
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p->acf = new_fvec (bufsize / 2 + 1);
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p->tol = 1.;
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p->confidence = 0.;
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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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void
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aubio_pitchspecacf_do (aubio_pitchspecacf_t * p, const fvec_t * input, fvec_t * output)
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{
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uint_t l, tau;
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fvec_t *fftout = p->fftout;
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// window the input
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for (l = 0; l < input->length; l++) {
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p->winput->data[l] = p->win->data[l] * input->data[l];
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}
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// get the real / imag parts of its fft
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aubio_fft_do_complex (p->fft, p->winput, fftout);
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for (l = 0; l < input->length / 2 + 1; l++) {
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p->sqrmag->data[l] = SQR(fftout->data[l]);
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}
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// get the real / imag parts of the fft of the squared magnitude
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aubio_fft_do_complex (p->fft, p->sqrmag, fftout);
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// copy real part to acf
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for (l = 0; l < fftout->length / 2 + 1; l++) {
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p->acf->data[l] = fftout->data[l];
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}
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// get the minimum
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tau = fvec_min_elem (p->acf);
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// get the interpolated minimum
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output->data[0] = fvec_quadratic_peak_pos (p->acf, tau) * 2.;
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}
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void
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del_aubio_pitchspecacf (aubio_pitchspecacf_t * p)
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{
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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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del_fvec (p->sqrmag);
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del_fvec (p->fftout);
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del_fvec (p->acf);
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AUBIO_FREE (p);
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}
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smpl_t
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aubio_pitchspecacf_get_confidence (const aubio_pitchspecacf_t * o) {
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// no confidence for now
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return o->confidence;
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}
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uint_t
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aubio_pitchspecacf_set_tolerance (aubio_pitchspecacf_t * p, smpl_t tol)
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{
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p->tol = tol;
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return 0;
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}
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smpl_t
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aubio_pitchspecacf_get_tolerance (const aubio_pitchspecacf_t * p)
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{
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return p->tol;
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}
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