82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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pYIN - A fundamental frequency estimator for monophonic audio
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Centre for Digital Music, Queen Mary, University of London.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#include "MonoPitch.h"
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#include "MonoPitchHMM.h"
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#include <vector>
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#include <cstdio>
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#include <cmath>
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#include <complex>
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using std::vector;
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using std::pair;
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MonoPitch::MonoPitch() :
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hmm()
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{
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}
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MonoPitch::~MonoPitch()
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{
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}
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const vector<float>
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MonoPitch::process(const vector<vector<pair<double, double> > > pitchProb)
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{
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// std::cerr << "before observation prob calculation" << std::endl;
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vector<vector<double> > obsProb;
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for (size_t iFrame = 0; iFrame < pitchProb.size(); ++iFrame)
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{
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obsProb.push_back(hmm.calculateObsProb(pitchProb[iFrame]));
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}
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vector<double> *scale = new vector<double>(0);
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vector<float> out;
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// std::cerr << "before Viterbi decoding" << obsProb.size() << "ng" << obsProb[1].size() << std::endl;
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vector<int> path = hmm.decodeViterbi(obsProb, scale);
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// std::cerr << "after Viterbi decoding" << std::endl;
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for (size_t iFrame = 0; iFrame < path.size(); ++iFrame)
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{
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// std::cerr << path[iFrame] << " " << hmm.m_freqs[path[iFrame]] << std::endl;
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float hmmFreq = hmm.m_freqs[path[iFrame]];
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float bestFreq = 0;
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float leastDist = 10000;
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if (hmmFreq > 0)
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{
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// This was a Yin estimate, so try to get original pitch estimate back
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// ... a bit hacky, since we could have directly saved the frequency
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// that was assigned to the HMM bin in hmm.calculateObsProb -- but would
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// have had to rethink the interface of that method.
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for (size_t iPitch = 0; iPitch < pitchProb[iFrame].size(); ++iPitch)
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{
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float freq = 440. * std::pow(2, (pitchProb[iFrame][iPitch].first - 69)/12);
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float dist = std::abs(hmmFreq-freq);
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if (dist < leastDist)
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{
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leastDist = dist;
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bestFreq = freq;
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}
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}
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} else {
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bestFreq = hmmFreq;
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}
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out.push_back(bestFreq);
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}
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delete scale;
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return(out);
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}
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