public static Task <float []> Calculate(Soundfile soundfile)
{
SoundfileValidator.ValidateBasics(soundfile);
var centroid = soundfile.GetFrequencyCentroid();
if (centroid is null || centroid.Length == 0)
{
throw new InvalidOperationException($"{nameof (soundfile)} does not have frequency centroid calculated. Calculate it first.");
}
return(Task.Run(() =>
{
var count = soundfile.GetSamples().Length / soundfile.FrameLength;
var bandwidth = new float [count];
_ = Parallel.For(0, count, (i) =>
{
var singleFrame = soundfile.GetFftPerFrame(i);
float sumUp = 0, sumDown = 0;
for (int s = 0; s < singleFrame.Length; s++)
{
sumUp += (s - centroid [i]) * (s - centroid [i]) * singleFrame [s] * singleFrame [s];
sumDown += singleFrame [s] * singleFrame [s];
}
var band = sumUp / sumDown;
bandwidth [i] = float.IsInfinity(band) || float.IsNaN(band) ? 0 : sumUp / sumDown;
});
return bandwidth;
}));
}
public static Task <float []> Calculate(Soundfile soundfile)
{
if (!MainWindow.ShowHiddenParameters)
{
return(Task.Run(() => Array.Empty <float> ()));
}
SoundfileValidator.ValidateBasics(soundfile);
var f1 = soundfile.BEFrequencyStart;
var f2 = soundfile.BEFrequencyStop;
return(Task.Run(() =>
{
var count = soundfile.GetSamples().Length / soundfile.FrameLength;
var csf = new float [count];
_ = Parallel.For(0, count, (i) =>
{
var maxUp = soundfile.GetFftPerFrame(i).Max(f => f * f);
double down = 0;
for (int s = f1; s < Math.Min(f2 + 1, soundfile.GetFftPerFrame(i).Length); s++)
{
down += soundfile.GetFftPerFrame(i) [s] * soundfile.GetFftPerFrame(i) [s];
}
down /= f2 - f1 + 1;
var add = (float)(maxUp / down);
if (!float.IsNaN(add) && !float.IsInfinity(add))
{
csf [i] = add;
}
});
return csf;
}));
}
public static Task <float []> Calculate(Soundfile soundfile)
{
SoundfileValidator.ValidateBasics(soundfile);
return(Task.Run(() =>
{
var volume = new float [soundfile.GetSamples().Length / soundfile.FrameLength];
_ = Parallel.For(0, soundfile.GetSamples().Length / soundfile.FrameLength, (i) =>
{
var singleVolume = soundfile.GetFftPerFrame(i);
float sum = 0;
foreach (var j in singleVolume)
{
sum += j * j;
}
volume [i] = (sum / soundfile.FrameLength);
});
return volume;
}));
}
public static Task <float []> Calculate(Soundfile soundfile)
{
SoundfileValidator.ValidateBasics(soundfile);
return(Task.Run(() =>
{
var fc = new float [soundfile.GetSamples().Length / soundfile.FrameLength];
_ = Parallel.For(0, soundfile.GetSamples().Length / soundfile.FrameLength, (i) =>
{
var singleFc = soundfile.GetFftPerFrame(i);
float sumUp = 0, sumDown = 0;
for (int s = 0; s < singleFc.Length; s++)
{
sumUp += s * singleFc [s];
sumDown += singleFc [s];
}
var cent = sumUp / sumDown;
fc [i] = float.IsNaN(cent) || float.IsInfinity(cent) ? 0 : sumUp / sumDown;
});
return fc;
}));
}
public static Task <float []> Calculate(Soundfile soundfile)
{
if (!MainWindow.ShowHiddenParameters)
{
return(Task.Run(() => Array.Empty <float> ()));
}
SoundfileValidator.ValidateBasics(soundfile);
var f1 = soundfile.BEFrequencyStart;
var f2 = soundfile.BEFrequencyStop;
return(Task.Run(() =>
{
var count = soundfile.GetSamples().Length / soundfile.FrameLength;
var sfm = new float [count];
_ = Parallel.For(0, count, (i) =>
{
double up = 1, down = 0;
var max = Math.Min(f2 + 1, soundfile.GetFftPerFrame(i).Length);
double n = max - f1;
for (int s = f1; s < max; s++)
{
if (soundfile.GetFftPerFrame(i) [s] == 0)
{
continue;
}
up *= Math.Pow(soundfile.GetFftPerFrame(i) [s], 2.0 / n);
down += soundfile.GetFftPerFrame(i) [s] * soundfile.GetFftPerFrame(i) [s];
}
down /= n;
var add = (float)(up / down);
if (!float.IsNaN(add) && !float.IsInfinity(add))
{
sfm [i] = add;
}
});
return sfm;
}));
}
public static Task <float []> Calculate(Soundfile soundfile)
{
SoundfileValidator.ValidateBasics(soundfile);
var f1 = soundfile.BEFrequencyStart;
var f2 = soundfile.BEFrequencyStop;
return(Task.Run(() =>
{
var count = soundfile.GetSamples().Length / soundfile.FrameLength;
var energy = new float [count];
_ = Parallel.For(0, count, (i) =>
{
float sumUp = 0, sumDown = 0;
for (int s = f1; s < Math.Min(f2 + 1, soundfile.GetFftPerFrame(i).Length); s++)
{
sumUp += soundfile.GetFftPerFrame(i) [s] * soundfile.GetFftPerFrame(i) [s];
sumDown++;
}
energy [i] = sumUp / sumDown;
});
return energy;
}));
}