public void Test_SFF_Mel()
{
(double[] audio, int sampleRate) = AudioFile.ReadWAV("../../../../../data/cant-do-that-44100.wav");
int fftSize = 1 << 12;
var spec = new SpectrogramGenerator(sampleRate, fftSize, stepSize: 700);
var window = new FftSharp.Windows.Hanning();
spec.SetWindow(window.Create(fftSize / 3)); // sharper window than typical
spec.Add(audio);
Bitmap bmp = spec.GetBitmapMel(250);
bmp.Save("../../../../../dev/sff/halMel.png", System.Drawing.Imaging.ImageFormat.Png);
spec.SaveData("../../../../../dev/sff/halMel.sff", melBinCount: 250);
var spec2 = new SFF("../../../../../dev/sff/halMel.sff");
Assert.AreEqual(spec.SampleRate, spec2.SampleRate);
Assert.AreEqual(spec.StepSize, spec2.StepSize);
Assert.AreEqual(spec.Width, spec2.Width);
Assert.AreEqual(spec.FftSize, spec2.FftSize);
Assert.AreEqual(spec.NextColumnIndex, spec2.FftFirstIndex);
Assert.AreEqual(spec.Height, spec2.Height);
Assert.AreEqual(spec.OffsetHz, spec2.OffsetHz);
}
public void Test_SFF_Linear()
{
(double[] audio, int sampleRate) = AudioFile.ReadWAV("../../../../../data/cant-do-that-44100.wav");
int fftSize = 1 << 12;
var spec = new SpectrogramGenerator(sampleRate, fftSize, stepSize: 700, maxFreq: 2000);
spec.SetWindow(FftSharp.Window.Hanning(fftSize / 3)); // sharper window than typical
spec.Add(audio);
spec.SaveData("../../../../../dev/sff/hal.sff");
var spec2 = new SFF("../../../../../dev/sff/hal.sff");
Assert.AreEqual(spec.SampleRate, spec2.SampleRate);
Assert.AreEqual(spec.StepSize, spec2.StepSize);
Assert.AreEqual(spec.Width, spec2.Width);
Assert.AreEqual(spec.FftSize, spec2.FftSize);
Assert.AreEqual(spec.NextColumnIndex, spec2.FftFirstIndex);
Assert.AreEqual(spec.Height, spec2.Height);
Assert.AreEqual(spec.OffsetHz, spec2.OffsetHz);
}
public void Test_Make_CommonColormaps()
{
(double[] audio, int sampleRate) = AudioFile.ReadWAV("../../../../../data/cant-do-that-44100.wav");
int fftSize = 1 << 12;
var spec = new SpectrogramGenerator(sampleRate, fftSize, stepSize: 700, maxFreq: 2000);
spec.SetWindow(FftSharp.Window.Hanning(fftSize / 3)); // sharper window than typical
spec.Add(audio);
// delete old colormap files
foreach (var filePath in System.IO.Directory.GetFiles("../../../../../dev/graphics/", "hal-*.png"))
{
System.IO.File.Delete(filePath);
}
foreach (var cmap in Colormap.GetColormaps())
{
spec.SetColormap(cmap);
spec.SaveImage($"../../../../../dev/graphics/hal-{cmap.Name}.png");
Debug.WriteLine($"");
}
}
