61 lines
1.2 KiB
C++
61 lines
1.2 KiB
C++
|
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
|
||
|
|
|
||
|
|
/*
|
||
|
|
QM DSP Library
|
||
|
|
|
||
|
|
Centre for Digital Music, Queen Mary, University of London.
|
||
|
|
This file copyright 2008 Kurt Jacobson and QMUL.
|
||
|
|
|
||
|
|
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 "BeatSpectrum.h"
|
||
|
|
|
||
|
|
#include "maths/CosineDistance.h"
|
||
|
|
|
||
|
|
using std::vector;
|
||
|
|
|
||
|
|
vector<double> BeatSpectrum::process(const vector<vector<double> > &m)
|
||
|
|
{
|
||
|
|
int origin = 0;
|
||
|
|
int sz = m.size()/2;
|
||
|
|
|
||
|
|
int i, j, k;
|
||
|
|
|
||
|
|
vector<double> v(sz);
|
||
|
|
for (i = 0; i < sz; ++i) v[i] = 0.0;
|
||
|
|
|
||
|
|
CosineDistance cd;
|
||
|
|
|
||
|
|
for (i = origin; i < origin + sz; ++i) {
|
||
|
|
|
||
|
|
k = 0;
|
||
|
|
|
||
|
|
for (j = i + 1; j < i + sz + 1; ++j) {
|
||
|
|
|
||
|
|
v[k++] += cd.distance(m[i], m[j]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// normalize
|
||
|
|
|
||
|
|
double max = 0.0;
|
||
|
|
|
||
|
|
for (i = 0; i < sz; ++i) {
|
||
|
|
if (v[i] > max) max = v[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
if (max > 0.0) {
|
||
|
|
for (i = 0; i < sz; ++i) {
|
||
|
|
v[i] /= max;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|