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// Copyright 2007 "Gilles Degottex"
// This file is part of "Music"
// "Music" is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// "Music" 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "CombedFT.h"
#include <assert.h>
#include <iostream>
using namespace std;
using namespace Math;
#include "Music.h"
#include "SPWindow.h"
#include "FreqAnalysis.h"
#include <QTextStream>
namespace Music
{
CombedFT::CombedFT()
{
m_use_audibility_treshold = false;
m_audib_ratio = 0.1;
m_zp_factor = 1.0;
m_window_factor = 1.0;
init();
}
void CombedFT::setZeroPaddingFactor(double zp)
{
if(zp!=m_zp_factor)
{
m_zp_factor = zp;
init();
}
}
void CombedFT::setWindowFactor(double wf)
{
if(wf!=m_window_factor)
{
m_window_factor = wf;
init();
}
}
void CombedFT::init()
{
if(GetSamplingRate()<=0) return;
m_f0 = 0.0;
int win_size = int(m_window_factor*GetSamplingRate()/h2f(GetSemitoneMin()));// at least m_window_factor period of the lowest freq
int best_size = 2;
while(best_size<int(win_size))
best_size *= 2;
m_win = hann(best_size);
while(best_size<int(m_zp_factor*win_size))
best_size *= 2;
cout << "CombedFT: INFO: window size=" << win_size << " FFT size=" << best_size << " window size factor=" << m_window_factor << " zero padding factor=" << m_zp_factor << endl;
m_plan.resize(best_size);
m_components.resize(m_plan.size()/2);
m_comb.resize(m_plan.size()/2);
}
int CombedFT::getSampleAlgoLatency() const
{
return 1000*int(m_win.size())/GetSamplingRate();
}
int CombedFT::getMinSize() const
{
return int(m_win.size());
}
double CombedFT::getFondamentalFreq() const
{
return m_f0;
}
void CombedFT::apply(const deque<double>& buff)
{
// cout << getAmplitudeTreshold() << " " << getComponentTreshold() << " " << m_audib_ratio << endl;
if(int(buff.size())<getMinSize() || m_win.empty()) return;
m_max_amplitude = 0.0;
for(size_t i=0; i<m_win.size(); i++)
{
m_plan.in[i] = buff[i]*m_win[i];
if(abs(buff[i])>m_max_amplitude)
m_max_amplitude = abs(buff[i]);
}
for(int i=int(m_win.size()); i<int(m_plan.size()); i++) // padd with zeros
m_plan.in[i] = 0.0;
m_plan.execute();
for(size_t i=0; i<m_comb.in.size() && i<m_plan.out.size(); i++)
m_comb.in[i] = mod(m_plan.out[i]);
// compute max with respect of the bounds
m_components_max = 0.0;
int max_index = -1;
double fmin = h2f(GetSemitoneMin());
double fmax = h2f(GetSemitoneMax());
for(size_t i=0; i<m_components.size(); i++)
{
double fi = i*double(GetSamplingRate())/m_plan.size();
if(fmin<=fi && fi<=fmax
&& m_comb.in[i]>m_components_max)
{
max_index = i;
m_components_max = m_comb.in[i];
}
}
m_f0 = 0.0;
if(m_components_max>getComponentTreshold())
{
m_f0 = PeakRefinementLogParabola(m_plan.out, max_index)*double(GetSamplingRate())/m_plan.size();
// TODO TEST *win[i]; // me semble qu'une trans de harm signal n'est pas trop discontinue aux extrémités
m_comb.execute();
for(size_t i=0; i<m_components.size(); i++)
m_components[i] = 0.0;
for(size_t i=0; i<m_comb.out.size()/2; i++)
m_components[i] = real(m_comb.out[i]);
// avg is not interesting
m_components[0] = 0.0;
// frequencies between 1 and g_res_factor are virtuals
// for(int i=m_comb.out.size()-(g_res_factor-1); i<m_comb.out.size(); i++)
// m_components[i] = 0.0;
double step = (m_plan.size()/max_index)/2;
// hyp: the fund freq is not greater than the max amplitude harmonic
// keep only multiples of the max amplitude harmonic
for(int i=1; i<int(m_components.size())/step; i++)
m_components[i] = m_components[int(step*i)];
for(int i=int(m_components.size()/step); i<int(m_components.size()); i++)
m_components[i] = 0.0;
if(m_use_audibility_treshold)
{
for(int i=1; i<int(m_components.size()/step); i++)
m_components[i] /= (1+m_audib_ratio*(i-1));
}
else
{
vector<double> temp_comp(int(m_components.size()/step), 0.0);
for(int i=1; i<int(temp_comp.size()); i++)
temp_comp[i] = (m_components[i]-m_components[i-1]) +
(m_components[i]-m_components[i+1]);
for(int i=1; i<int(temp_comp.size()); i++)
m_components[i] = temp_comp[i];
}
// find the max
double max_amp = 0.0;
max_index = -1;
for(size_t i=0; i<m_components.size(); i++)
{
// double fi = i*double(GetSamplingRate())/m_win.size();
if(m_components[i]>max_amp)
{
max_index = i;
max_amp = m_components[i];
}
}
if(max_index>0)
m_f0 /= max_index;
}
// cout << " final: " << GetSamplingRate() << ":" << m_f0 << endl;
}
CombedFT::~CombedFT()
{
}
}
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