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modified version of Steve's patch for bug 638

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v.audacity 2013-05-21 01:58:11 +00:00
parent c2ab493524
commit 1589720d93
1 changed files with 26 additions and 7 deletions
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33
src/effects/ChangePitch.cpp
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@ -74,16 +74,35 @@ void EffectChangePitch::DeduceFrequencies()
SelectedTrackListOfKindIterator iter(Track::Wave, mTracks);
WaveTrack *track = (WaveTrack *) iter.First();
if (track) {
const int windowSize = 1024;
const int analyzeSize = 8192;
const int numWindows = analyzeSize / windowSize;
double rate = track->GetRate();
// Auto-size window -- high sample rates require larger windowSize.
// Aim for around 2048 samples at 44.1 kHz (good down to about 100 Hz).
// To detect single notes, analysis period should be about 0.2 seconds.
// windowSize must be a power of 2.
int windowSize = wxRound(pow(2.0, floor((log(rate / 20.0)/log(2.0)) + 0.5)));
// windowSize < 256 too inaccurate
windowSize = (windowSize > 256)? windowSize : 256;
// we want about 0.2 seconds to catch the first note.
// number of windows rounded to nearest integer >= 1.
int numWindows = wxRound((double)(rate / (5.0f * windowSize)));
numWindows = (numWindows > 0)? numWindows : 1;
double trackStart = track->GetStartTime();
double t0 = mT0 < trackStart? trackStart: mT0;
sampleCount start = track->TimeToLongSamples(t0);
double rate = track->GetRate();
float buffer[analyzeSize];
float freq[windowSize/2];
float freqa[windowSize/2];
int analyzeSize = windowSize * numWindows;
float * buffer;
buffer = new float[analyzeSize];
float * freq;
freq = new float[windowSize/2];
float * freqa;
freqa = new float[windowSize/2];
int i, j, argmax;
int lag;