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: */
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/*
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QM DSP Library
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Centre for Digital Music, Queen Mary, University of London.
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This file copyright 2008 Kurt Jacobson and QMUL.
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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 "BeatSpectrum.h"
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#include "maths/CosineDistance.h"
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using std::vector;
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vector<double> BeatSpectrum::process(const vector<vector<double> > &m)
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{
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int origin = 0;
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int sz = m.size()/2;
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int i, j, k;
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vector<double> v(sz);
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for (i = 0; i < sz; ++i) v[i] = 0.0;
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CosineDistance cd;
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for (i = origin; i < origin + sz; ++i) {
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k = 0;
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for (j = i + 1; j < i + sz + 1; ++j) {
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v[k++] += cd.distance(m[i], m[j]);
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}
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}
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// normalize
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double max = 0.0;
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for (i = 0; i < sz; ++i) {
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if (v[i] > max) max = v[i];
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}
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if (max > 0.0) {
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for (i = 0; i < sz; ++i) {
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v[i] /= max;
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}
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}
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return v;
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}
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