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pulling vendor branch for rubberband

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git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@2768 d708f5d6-7413-0410-9779-e7cbd77b26cf
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Paul Davis 2007-12-11 15:16:51 +00:00
parent 8037a26395
commit 7d23cd1b31
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libs/rubberband/1.0/src/SpectralDifferenceAudioCurve.cpp Normal file
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/* -*- 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 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 double[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)
{
m_windowSize = newSize;
}
float
SpectralDifferenceAudioCurve::process(float *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;
}
}