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This commit is contained in:
Chris Cannam
2022-05-26 15:09:40 +01:00
parent 83f2b7607b fa004562f7
commit dd8d328ffb
2 changed files with 42 additions and 61 deletions
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40
src/finer/R3StretcherImpl.cpp
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@@ -415,12 +415,12 @@ R3StretcherImpl::analyseChannel(int c, int inhop, int prevInhop, int prevOuthop)
cd->inbuf->peek(buf, longest);
}
// We have a single unwindowed frame at the longest FFT
// size ("scale"). Populate the shorter FFT sizes from the
// centre of it, windowing as we copy. The classification
// scale is handled separately because it has readahead,
// so skip it here as well as the longest. (In practice
// this means we are probably only populating one scale)
// We have a single unwindowed frame at the longest FFT size
// ("scale"). Populate the shorter FFT sizes from the centre of
// it, windowing as we copy. The classification scale is handled
// separately because it has readahead, so skip it here as well as
// the longest. (In practice this means we are probably only
// populating one scale)
for (auto &it: cd->scales) {
int fftSize = it.first;
@@ -539,9 +539,8 @@ R3StretcherImpl::analyseChannel(int c, int inhop, int prevInhop, int prevOuthop)
}
}
// Use the classification scale to get a bin segmentation
// and calculate the adaptive frequency guide for this
// channel
// Use the classification scale to get a bin segmentation and
// calculate the adaptive frequency guide for this channel
cd->prevSegmentation = cd->segmentation;
cd->segmentation = cd->nextSegmentation;
cd->nextSegmentation = cd->segmenter->segment(readahead.mag.data());
@@ -595,9 +594,9 @@ R3StretcherImpl::synthesiseChannel(int c, int outhop)
}
winscale = double(outhop) / winscale;
// The frequency filter is applied naively in the
// frequency domain. Aliasing is reduced by the
// shorter resynthesis window
// The frequency filter is applied naively in the frequency
// domain. Aliasing is reduced by the shorter resynthesis
// window
double factor = m_parameters.sampleRate / double(fftSize);
for (int i = 0; i < fftSize/2 + 1; ++i) {
@@ -611,9 +610,9 @@ R3StretcherImpl::synthesiseChannel(int c, int outhop)
}
}
// Resynthesise each FFT size (scale) individually, then
// sum. This is easier to manage scaling for in situations
// with a varying resynthesis hop
// Resynthesise each FFT size (scale) individually, then sum. This
// is easier to manage scaling for in situations with a varying
// resynthesis hop
for (auto &it : cd->scales) {
int fftSize = it.first;
@@ -641,12 +640,11 @@ R3StretcherImpl::synthesiseChannel(int c, int outhop)
v_fftshift(scale->timeDomain.data(), fftSize);
// Synthesis window is shorter than analysis window,
// so copy and cut only from the middle of the
// time-domain frame; and the accumulator length
// always matches the longest FFT size, so as to make
// mixing straightforward, so there is an additional
// offset needed for the target
// Synthesis window may be shorter than analysis window, so
// copy and cut only from the middle of the time-domain frame;
// and the accumulator length always matches the longest FFT
// size, so as to make mixing straightforward, so there is an
// additional offset needed for the target
int synthesisWindowSize = scaleData->synthesisWindow.getSize();
int fromOffset = (fftSize - synthesisWindowSize) / 2;