private void ProcessFullSpectrum(
SpectralFluxAnalyzer analyzer,
ThreadSafeAudioClip clip,
OnAudioClipProcessed callback)
{
var processedSamples = GetChannelsCombined(clip.Samples, clip.ChannelCount, clip.SampleCount);
Debug.Log("Channels have been combined");
var iterations = processedSamples.Length / _fftSampleSize;
var fft = new FFT();
fft.Initialize(_fftSampleSize);
var chunk = new double[_fftSampleSize];
for (var i = 0; i < iterations; ++i)
{
Array.Copy(processedSamples, i * _fftSampleSize, chunk, 0, _fftSampleSize);
var windowCoefficients = DSP.Window.Coefficients(DSP.Window.Type.Hamming, _fftSampleSize);
var scaledSpectrumChunk = DSP.Math.Multiply(chunk, windowCoefficients);
var scaleFactor = DSP.Window.ScaleFactor.Signal(windowCoefficients);
var fftSpectrum = fft.Execute(scaledSpectrumChunk);
var scaledFftSpectrum = DSP.ConvertComplex.ToMagnitude(fftSpectrum);
scaledFftSpectrum = DSP.Math.Multiply(scaledFftSpectrum, scaleFactor);
var currentSongTime = GetTimeFromIndex(i, clip.Frequency) * _fftSampleSize;
analyzer.AnalyzeSpectrum(Array.ConvertAll(scaledFftSpectrum, x => (float)x), currentSongTime);
}
callback(analyzer);
}
public void ProcessClip(AudioClip clip, SpectralFluxAnalyzer spectralFluxAnalyzer, OnAudioClipProcessed callback)
{
_threadClip = new ThreadSafeAudioClip(clip);
var t = new Thread(() =>
{
ProcessFullSpectrum(
spectralFluxAnalyzer,
_threadClip,
callback);
});
t.Start();
}
