1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
5 An audio time-stretching and pitch-shifting library.
6 Copyright 2007-2008 Chris Cannam.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2 of the
11 License, or (at your option) any later version. See the file
12 COPYING included with this distribution for more information.
15 #include "SpectralDifferenceAudioCurve.h"
20 SpectralDifferenceAudioCurve::SpectralDifferenceAudioCurve(size_t sampleRate, size_t windowSize) :
21 AudioCurve(sampleRate, windowSize)
23 m_prevMag = new float[m_windowSize/2 + 1];
25 for (size_t i = 0; i <= m_windowSize/2; ++i) {
30 SpectralDifferenceAudioCurve::~SpectralDifferenceAudioCurve()
36 SpectralDifferenceAudioCurve::reset()
38 for (size_t i = 0; i <= m_windowSize/2; ++i) {
44 SpectralDifferenceAudioCurve::setWindowSize(size_t newSize)
47 m_windowSize = newSize;
49 m_prevMag = new float[m_windowSize/2 + 1];
55 SpectralDifferenceAudioCurve::process(const float *R__ mag, size_t increment)
59 for (size_t n = 0; n <= m_windowSize / 2; ++n) {
60 result += sqrtf(fabsf((mag[n] * mag[n]) -
61 (m_prevMag[n] * m_prevMag[n])));
62 m_prevMag[n] = mag[n];
69 SpectralDifferenceAudioCurve::processDouble(const double *R__ mag, size_t increment)
73 for (size_t n = 0; n <= m_windowSize / 2; ++n) {
74 result += sqrtf(fabsf((mag[n] * mag[n]) -
75 (m_prevMag[n] * m_prevMag[n])));
76 m_prevMag[n] = (float)mag[n];