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Avoid recalculating window scale factor every time

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This commit is contained in:
Chris Cannam
2022-06-09 16:39:30 +01:00
parent bc764c62ea
commit 2298b67869
2 changed files with 13 additions and 15 deletions
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12
src/finer/R3StretcherImpl.h
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@@ -233,6 +233,7 @@ protected:
FFT fft;
Window<double> analysisWindow;
Window<double> synthesisWindow;
double windowScaleFactor;
GuidedPhaseAdvance guided;
ScaleData(GuidedPhaseAdvance::Parameters guidedParameters) :
fftSize(guidedParameters.fftSize),
@@ -241,7 +242,16 @@ protected:
analysisWindowLength(fftSize)),
synthesisWindow(synthesisWindowShape(fftSize),
synthesisWindowLength(fftSize)),
guided(guidedParameters) { }
guided(guidedParameters),
windowScaleFactor(0.0)
{
int asz = analysisWindow.getSize(), ssz = synthesisWindow.getSize();
int off = (asz - ssz) / 2;
for (int i = 0; i < ssz; ++i) {
windowScaleFactor += analysisWindow.getValue(i + off) *
synthesisWindow.getValue(i);
}
}
WindowType analysisWindowShape(int fftSize);
int analysisWindowLength(int fftSize);