view MonoPitch.cpp @ 137:109c3a2ad930 vamp-fft-revision

Make use of new Vamp FFT interface. This reduces the runtime of the regression test from 5.7 to 2.2 seconds on this machine, but it does need the right version of the SDK, which is currently only available in the vampipe branch.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    pYIN - A fundamental frequency estimator for monophonic audio
    Centre for Digital Music, Queen Mary, University of London.
    
    This program 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 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "MonoPitch.h"
#include "MonoPitchHMM.h"
#include <vector>

#include <cstdio>
#include <cmath>
#include <complex>

using std::vector;
using std::pair;

MonoPitch::MonoPitch() :
    hmm()
{
}

MonoPitch::~MonoPitch()
{
}

const vector<float>
MonoPitch::process(const vector<vector<pair<double, double> > > pitchProb)
{
    // std::cerr << "before observation prob calculation" << std::endl;
    vector<vector<double> > obsProb;
    for (size_t iFrame = 0; iFrame < pitchProb.size(); ++iFrame)
    {
        obsProb.push_back(hmm.calculateObsProb(pitchProb[iFrame]));
    }
    
    vector<double> *scale = new vector<double>(0);
    
    vector<float> out; 
    
    // std::cerr << "before Viterbi decoding" << obsProb.size() << "ng" << obsProb[1].size() << std::endl;
    vector<int> path = hmm.decodeViterbi(obsProb, scale);
    // std::cerr << "after Viterbi decoding" << std::endl;
    
    for (size_t iFrame = 0; iFrame < path.size(); ++iFrame)
    {
        // std::cerr << path[iFrame] << " " << hmm.m_freqs[path[iFrame]] << std::endl;
        float hmmFreq = hmm.m_freqs[path[iFrame]];
        float bestFreq = 0;
        float leastDist = 10000;
        if (hmmFreq > 0)
        {
            // This was a Yin estimate, so try to get original pitch estimate back
            // ... a bit hacky, since we could have direclty saved the frequency
            // that was assigned to the HMM bin in hmm.calculateObsProb -- but would
            // have had to rethink the interface of that method.
            for (size_t iPitch = 0; iPitch < pitchProb[iFrame].size(); ++iPitch)
            {
                float freq = 440. * std::pow(2, (pitchProb[iFrame][iPitch].first - 69)/12);
                float dist = std::abs(hmmFreq-freq);
                if (dist < leastDist)
                {
                    leastDist = dist;
                    bestFreq = freq;
                }
            }
        } else {
            bestFreq = hmmFreq;
        }
        out.push_back(bestFreq);
    }
    delete scale;
    return(out);
}