70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
|
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
|
||
|
|
|
||
|
|
/*
|
||
|
|
Rubber Band
|
||
|
|
An audio time-stretching and pitch-shifting library.
|
||
|
|
Copyright 2007-2008 Chris Cannam.
|
||
|
|
|
||
|
|
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 "SpectralDifferenceAudioCurve.h"
|
||
|
|
|
||
|
|
namespace RubberBand
|
||
|
|
{
|
||
|
|
|
||
|
|
SpectralDifferenceAudioCurve::SpectralDifferenceAudioCurve(size_t sampleRate, size_t windowSize) :
|
||
|
|
AudioCurve(sampleRate, windowSize)
|
||
|
|
{
|
||
|
|
m_prevMag = new float[m_windowSize/2 + 1];
|
||
|
|
|
||
|
|
for (size_t i = 0; i <= m_windowSize/2; ++i) {
|
||
|
|
m_prevMag[i] = 0.f;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
SpectralDifferenceAudioCurve::~SpectralDifferenceAudioCurve()
|
||
|
|
{
|
||
|
|
delete[] m_prevMag;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
SpectralDifferenceAudioCurve::reset()
|
||
|
|
{
|
||
|
|
for (size_t i = 0; i <= m_windowSize/2; ++i) {
|
||
|
|
m_prevMag[i] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
SpectralDifferenceAudioCurve::setWindowSize(size_t newSize)
|
||
|
|
{
|
||
|
|
delete[] m_prevMag;
|
||
|
|
m_windowSize = newSize;
|
||
|
|
|
||
|
|
m_prevMag = new float[m_windowSize/2 + 1];
|
||
|
|
|
||
|
|
reset();
|
||
|
|
}
|
||
|
|
|
||
|
|
float
|
||
|
|
SpectralDifferenceAudioCurve::process(const float *R__ mag, size_t increment)
|
||
|
|
{
|
||
|
|
float result = 0.0;
|
||
|
|
|
||
|
|
for (size_t n = 0; n <= m_windowSize / 2; ++n) {
|
||
|
|
result += sqrtf(fabsf((mag[n] * mag[n]) -
|
||
|
|
(m_prevMag[n] * m_prevMag[n])));
|
||
|
|
m_prevMag[n] = mag[n];
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|