1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
4 pYIN - A fundamental frequency estimator for monophonic audio
5 Centre for Digital Music, Queen Mary, University of London.
7 This program is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version. See the file
11 COPYING included with this distribution for more information.
17 #include "vamp-sdk/FFT.h"
18 #include "MeanFilter.h"
31 static double sumSquare(const double *in, const size_t startInd, const size_t endInd);
32 static void difference(const double *in, double *yinBuffer, const size_t yinBufferSize);
33 static void fastDifference(const double *in, double *yinBuffer, const size_t yinBufferSize);
34 static void slowDifference(const double *in, double *yinBuffer, const size_t yinBufferSize);
35 static void cumulativeDifference(double *yinBuffer, const size_t yinBufferSize);
36 static int absoluteThreshold(const double *yinBuffer, const size_t yinBufferSize, const double thresh);
37 static vector<double> yinProb(const double *yinBuffer, const size_t prior, const size_t yinBufferSize, size_t minTau = 0, size_t maxTau = 0);
38 static double parabolicInterpolation(const double *yinBuffer, const size_t tau,
39 const size_t yinBufferSize);