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// Copyright 2004 "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 "CumulativeDiffAlgo.h"
#include <cassert>
#include <cmath>
#include <deque>
#include <iostream>
#include <algorithm>
#include <limits>
using namespace std;
#include <CppAddons/CAMath.h>
using namespace Math;
#include "Music.h"
//#define MUSIC_DEBUG
#ifdef MUSIC_DEBUG
#define LOG(a) a
#else
#define LOG(a)
#endif
namespace Music
{
void CumulativeDiffAlgo::init()
{
setMinMaxLength(int(GetSamplingRate()/h2f(GetSemitoneMax())), int(GetSamplingRate()/h2f(GetSemitoneMin())));
}
CumulativeDiffAlgo::CumulativeDiffAlgo(double noise_treshold)
: m_noise_threshold(noise_treshold)
, m_wave_length(0)
{
init();
}
//! return the average differance on the sample delimited by [0,size]
// - ne pas utiliser tout size
// - sauter des données
double diff(const deque<double>& buff, size_t size, size_t s)
{
double r = 0.0;
for(size_t i=0; i<size; i++)
r += abs(buff[i] - buff[i+s]);
return r / size;
}
void CumulativeDiffAlgo::apply(const deque<double>& buff)
{
if(buff.size()<2*m_max_length)
{
m_wave_length = 0;
return;
}
double max_vol = 0.0;
for(size_t i=0; i<m_max_length; i++)
max_vol = std::max(max_vol, buff[i]);
// use a relative threshold
double threshold = m_noise_threshold*max_vol;
// cout << "min=" << min_length << " max=" << m_max_length << " threshold=" << treshold << endl;
double r = 0.0;
size_t s;
for(s=m_min_length; r<=threshold && s<m_max_length; s++)
r = diff(buff, m_max_length, s);
while((r=diff(buff, m_max_length, s+1))>threshold && s<m_max_length)
s++;
// cout << "s=" << s << " r=" << r << endl;
double old_r = r;
while(s+1<m_max_length && (r=diff(buff, m_max_length, s+1))<old_r)
{
// cout << "s=" << s << " r=" << r << endl;
s++;
old_r = r;
}
// cout << "s=" << s << " r=" << old_r << endl;
// cout << "absolute threshold=" << m_noise_threshold << " max volume="<<max_vol<<" relative threshold="<<threshold << " s="<<s << " m_max_length="<<m_max_length << endl;
m_wave_length = (s<m_max_length)?s:0;
}
/*
* ~YIN version, unused because too costly for the CPU: O(n^3) ...
double CumulativeDiffAlgo::squar_diff(const deque<double>& buff, size_t s)
{
double r = 0.0;
for(size_t i=0; i<s; i++)
{
double d = buff[i] - buff[i+s];
r += d*d;
}
return r;
}
double CumulativeDiffAlgo::norm_squar_diff(const deque<double>& buff, size_t s)
{
double r = 0.0;
for(size_t i=0; i<s; i++)
r += squar_diff(buff, i);
return squar_diff(buff, s) / (r/s);
}
void CumulativeDiffAlgo::receive(const deque<double>& buff)
{
assert(m_sampling_rate>0);
size_t min_length = size_t(m_sampling_rate * m_min_wave_length);
size_t max_length = size_t(m_sampling_rate * m_max_wave_length);
if(buff.size()<2*max_length) return;
cout << "min=" << min_length << " max=" << max_length << " noise=" << m_noise_treshold << endl;
double r = 1.0;
double max_vol = 0.0;
size_t s;
for(s=min_length; r>m_noise_treshold && s<max_length; s++)
{
max_vol = max(max_vol, buff[s]);
r = norm_squar_diff(buff, s);
// cout << "s=" << s << " r=" << r << endl;
}
s--;
cout << "s=" << s << " r=" << r << endl;
// cout << "---" << endl;
double old_r;
do
{
s++;
old_r = r;
r = norm_squar_diff(buff, s);
// cout << "s=" << s << " r=" << r << endl;
}
while(r<old_r && s<max_length);
r = old_r;
s--;
cout << "s=" << s << " r=" << r << endl;
cout << "m_noise_treshold=" << m_noise_treshold << " max_vol=" << max_vol << " r=" << r << endl;
m_freq = 0.0;
if(max_vol>m_noise_treshold && s<max_length)
{
cout << "r=" << r << " m_noise_treshold=" << m_noise_treshold << endl;
m_freq = double(m_sampling_rate)/s;
}
cout << "m_sampling_rate=" << m_sampling_rate << " freq=" << m_freq << endl;
}
*/
}
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