ref: 134cd3a1b76f29e6e2f888da59da9ce6c68cce44
dir: /src/pitch/pitchfcomb.c/
/* 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, 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); }