add an additional optional argument to manually init newAudio with an external List<double>

Author: shirok1

src/Spectrogram/SpectrogramGenerator.cs

@@ -25,15 +25,17 @@ public class SpectrogramGenerator
 
  private readonly Settings settings;
  private readonly List<double[]> ffts = new List<double[]>();
- private readonly List<double> newAudio = new List<double>();
+ private readonly List<double> newAudio;
  private Colormap cmap = Colormap.Viridis;
 
  public SpectrogramGenerator(int sampleRate, int fftSize, int stepSize,
  double minFreq = 0, double maxFreq = double.PositiveInfinity,
- int? fixedWidth = null, int offsetHz = 0)
+ int? fixedWidth = null, int offsetHz = 0, List<double> initialAudioList = null)
  {
  settings = new Settings(sampleRate, fftSize, stepSize, minFreq, maxFreq, offsetHz);
 
+ newAudio = initialAudioList ?? new List<double>();
+
  if (fixedWidth.HasValue)
  SetFixedWidth(fixedWidth.Value);
  }