ref: 67b2dbcccacd2a131de91e9e636456f6063868c7
parent: 45f4f7a24f7359b786f6e8a57455ed894caa5cb4
author: Paul Brossier <piem@piem.org>
date: Tue May 9 12:03:17 EDT 2017
src/pitch/pitchyinfast.h: fast version of original yin
--- /dev/null
+++ b/src/pitch/pitchyinfast.c
@@ -1,0 +1,188 @@
+/*
+ Copyright (C) 2003-2017 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/>.
+
+*/
+
+/* This algorithm was developed by A. de Cheveigné and H. Kawahara and
+ * published in:
+ *
+ * de Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
+ * estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
+ *
+ * see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
+ */
+
+#include "aubio_priv.h"
+#include "fvec.h"
+#include "mathutils.h"
+#include "cvec.h"
+#include "spectral/fft.h"
+#include "pitch/pitchyinfast.h"
+
+struct _aubio_pitchyinfast_t
+{+ fvec_t *yin;
+ smpl_t tol;
+ smpl_t confidence;
+ fvec_t *tmpdata;
+ fvec_t *sqdiff;
+ fvec_t *kernel;
+ fvec_t *samples_fft;
+ fvec_t *kernel_fft;
+ aubio_fft_t *fft;
+};
+
+aubio_pitchyinfast_t *
+new_aubio_pitchyinfast (uint_t bufsize)
+{+ aubio_pitchyinfast_t *o = AUBIO_NEW (aubio_pitchyinfast_t);
+ o->yin = new_fvec (bufsize / 2);
+ o->tmpdata = new_fvec (bufsize);
+ o->sqdiff = new_fvec (bufsize / 2);
+ o->kernel = new_fvec (bufsize);
+ o->samples_fft = new_fvec (bufsize);
+ o->kernel_fft = new_fvec (bufsize);
+ o->fft = new_aubio_fft (bufsize);
+ o->tol = 0.15;
+ return o;
+}
+
+void
+del_aubio_pitchyinfast (aubio_pitchyinfast_t * o)
+{+ del_fvec (o->yin);
+ del_fvec (o->tmpdata);
+ del_fvec (o->sqdiff);
+ del_fvec (o->kernel);
+ del_fvec (o->samples_fft);
+ del_fvec (o->kernel_fft);
+ del_aubio_fft (o->fft);
+ AUBIO_FREE (o);
+}
+
+/* all the above in one */
+void
+aubio_pitchyinfast_do (aubio_pitchyinfast_t * o, const fvec_t * input, fvec_t * out)
+{+ const smpl_t tol = o->tol;
+ fvec_t* yin = o->yin;
+ const uint_t length = yin->length;
+ uint_t B = o->tmpdata->length;
+ uint_t W = o->yin->length; // B / 2
+ fvec_t tmp_slice, kernel_ptr;
+ smpl_t *yin_data = yin->data;
+ uint_t tau;
+ sint_t period;
+ smpl_t tmp2 = 0.;
+
+ // compute r_t(0) + r_t+tau(0)
+ {+ fvec_t *squares = o->tmpdata;
+ fvec_weighted_copy(input, input, squares);
+#if 0
+ for (tau = 0; tau < W; tau++) {+ tmp_slice.data = squares->data + tau;
+ tmp_slice.length = W;
+ o->sqdiff->data[tau] = fvec_sum(&tmp_slice);
+ }
+#else
+ tmp_slice.data = squares->data;
+ tmp_slice.length = W;
+ o->sqdiff->data[0] = fvec_sum(&tmp_slice);
+ for (tau = 1; tau < W; tau++) {+ o->sqdiff->data[tau] = o->sqdiff->data[tau-1];
+ o->sqdiff->data[tau] -= squares->data[tau-1];
+ o->sqdiff->data[tau] += squares->data[W+tau-1];
+ }
+#endif
+ fvec_add(o->sqdiff, o->sqdiff->data[0]);
+ }
+ // compute r_t(tau) = -2.*ifft(fft(samples)*fft(samples[W-1::-1]))
+ {+ fvec_t *compmul = o->tmpdata;
+ fvec_t *rt_of_tau = o->samples_fft;
+ aubio_fft_do_complex(o->fft, input, o->samples_fft);
+ // build kernel, take a copy of first half of samples
+ tmp_slice.data = input->data;
+ tmp_slice.length = W;
+ kernel_ptr.data = o->kernel->data + 1;
+ kernel_ptr.length = W;
+ fvec_copy(&tmp_slice, &kernel_ptr);
+ // reverse them
+ fvec_rev(&kernel_ptr);
+ // compute fft(kernel)
+ aubio_fft_do_complex(o->fft, o->kernel, o->kernel_fft);
+ // compute complex product
+ compmul->data[0] = o->kernel_fft->data[0] * o->samples_fft->data[0];
+ for (tau = 1; tau < W; tau++) {+ compmul->data[tau] = o->kernel_fft->data[tau] * o->samples_fft->data[tau];
+ compmul->data[tau] -= o->kernel_fft->data[B-tau] * o->samples_fft->data[B-tau];
+ }
+ compmul->data[W] = o->kernel_fft->data[W] * o->samples_fft->data[W];
+ for (tau = 1; tau < W; tau++) {+ compmul->data[B-tau] = o->kernel_fft->data[B-tau] * o->samples_fft->data[tau];
+ compmul->data[B-tau] += o->kernel_fft->data[tau] * o->samples_fft->data[B-tau];
+ }
+ // compute inverse fft
+ aubio_fft_rdo_complex(o->fft, compmul, rt_of_tau);
+ // compute square difference r_t(tau) = sqdiff - 2 * r_t_tau[W-1:-1]
+ for (tau = 0; tau < W; tau++) {+ yin_data[tau] = o->sqdiff->data[tau] - 2. * rt_of_tau->data[tau+W];
+ }
+ }
+
+ // now build yin and look for first minimum
+ fvec_set_all(out, 0.);
+ yin_data[0] = 1.;
+ for (tau = 1; tau < length; tau++) {+ tmp2 += yin_data[tau];
+ if (tmp2 != 0) {+ yin->data[tau] *= tau / tmp2;
+ } else {+ yin->data[tau] = 1.;
+ }
+ period = tau - 3;
+ if (tau > 4 && (yin_data[period] < tol) &&
+ (yin_data[period] < yin_data[period + 1])) {+ out->data[0] = fvec_quadratic_peak_pos (yin, period);
+ goto beach;
+ }
+ }
+ out->data[0] = fvec_quadratic_peak_pos (yin, fvec_min_elem (yin) );
+beach:
+ return;
+}
+
+smpl_t
+aubio_pitchyinfast_get_confidence (aubio_pitchyinfast_t * o) {+ o->confidence = 1. - fvec_min (o->yin);
+ return o->confidence;
+}
+
+uint_t
+aubio_pitchyinfast_set_tolerance (aubio_pitchyinfast_t * o, smpl_t tol)
+{+ o->tol = tol;
+ return 0;
+}
+
+smpl_t
+aubio_pitchyinfast_get_tolerance (aubio_pitchyinfast_t * o)
+{+ return o->tol;
+}
--- /dev/null
+++ b/src/pitch/pitchyinfast.h
@@ -1,0 +1,102 @@
+/*
+ Copyright (C) 2003-2017 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/>.
+
+*/
+
+/** \file
+
+ Pitch detection using YIN algorithm (fast implementation)
+
+ This algorithm was developed by A. de Cheveigne and H. Kawahara and
+ published in:
+
+ De Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
+ estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
+
+ This implementation compute the autocorrelation function using time domain
+ convolution computed in the spectral domain.
+
+ see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
+ http://recherche.ircam.fr/equipes/pcm/cheveign/ps/2002_JASA_YIN_proof.pdf
+
+*/
+
+#ifndef AUBIO_PITCHYINFAST_H
+#define AUBIO_PITCHYINFAST_H
+
+#ifdef __cplusplus
+extern "C" {+#endif
+
+/** pitch detection object */
+typedef struct _aubio_pitchyinfast_t aubio_pitchyinfast_t;
+
+/** creation of the pitch detection object
+
+ \param buf_size size of the input buffer to analyse
+
+*/
+aubio_pitchyinfast_t *new_aubio_pitchyinfast (uint_t buf_size);
+
+/** deletion of the pitch detection object
+
+ \param o pitch detection object as returned by new_aubio_pitchyin()
+
+*/
+void del_aubio_pitchyinfast (aubio_pitchyinfast_t * o);
+
+/** execute pitch detection an input buffer
+
+ \param o pitch detection object as returned by new_aubio_pitchyin()
+ \param samples_in input signal vector (length as specified at creation time)
+ \param cands_out pitch period candidates, in samples
+
+*/
+void aubio_pitchyinfast_do (aubio_pitchyinfast_t * o, const fvec_t * samples_in, fvec_t * cands_out);
+
+
+/** set tolerance parameter for YIN algorithm
+
+ \param o YIN pitch detection object
+ \param tol tolerance parameter for minima selection [default 0.15]
+
+*/
+uint_t aubio_pitchyinfast_set_tolerance (aubio_pitchyinfast_t * o, smpl_t tol);
+
+/** get tolerance parameter for YIN algorithm
+
+ \param o YIN pitch detection object
+ \return tolerance parameter for minima selection [default 0.15]
+
+*/
+smpl_t aubio_pitchyinfast_get_tolerance (aubio_pitchyinfast_t * o);
+
+/** get current confidence of YIN algorithm
+
+ \param o YIN pitch detection object
+ \return confidence parameter
+
+*/
+smpl_t aubio_pitchyinfast_get_confidence (aubio_pitchyinfast_t * o);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AUBIO_PITCHYINFAST_H */
+