public static void Analyze(short[] amplitudes, int samplingRate,
out double[] frequencyAmplitudes, out Frequency[] idx2Frequency)
{
idx2Frequency = Fourier.FrequencyScale(amplitudes.Length, samplingRate).Select(d => new Frequency(d)).ToArray();
var fft = amplitudes.Select(a => new Complex(a, 0)).ToArray();
Fourier.Forward(fft);
frequencyAmplitudes = fft.Select(c => Math.Abs(c.Real)).ToArray();
}
public void UpdateSound2ColorMappingLines(List<ISound2ColorMapping> sound2ColorMappings)
{
ColorMappings.Children.Clear();
foreach (var mapping in sound2ColorMappings)
{
var pathSegments = new List<PathSegment>();
var firstPoint = new Point();
for (int x = 0; x < 200; x++)
{
var freq = new Frequency(x * 20);
var point = new Point(Frequency2Pixel(freq), -mapping.GetIntensityFromSoundFrequency(freq) * 50);
if (x == 0)
firstPoint = point;
else
pathSegments.Add(new LineSegment(point, point.Y < 0));
}
PathGeometry pg = new PathGeometry(new[] { new PathFigure(firstPoint, pathSegments, false) });
ColorMappings.Children.Add(new Path() { Data = pg, Stroke = new SolidColorBrush(mapping.Color), StrokeThickness = 2, VerticalAlignment = VerticalAlignment.Bottom });
}
}
public override double GetIntensityFromSoundFrequency(Frequency freq)
{
var val = Math.Max(1 - Math.Abs((freq.Value - SoundFrequencyMidpoint.Value) / SoundFrequencySpanWidth.Value), 0);
return val*IntensityMultiplier;
}
public abstract double GetIntensityFromSoundFrequency(Frequency freq);
private double Frequency2Pixel(Frequency freq)
{
return Math.Log(freq.Value+1)*scaling -logAdjust;
}