Method GetBounds

libraries/lib-wave-track-settings/SpectrogramSettings.cpp:814–858

}

void SpectrogramBounds::GetBounds(
   const WaveChannel &wc, float &min, float &max) const
{
   auto &wt = wc.GetTrack();
   const double rate = wt.GetRate();

   const auto &settings = SpectrogramSettings::Get(wt);
   const auto type = settings.scaleType;

   const float top = (rate / 2.);

   float bottom;
   if (type == SpectrogramSettings::stLinear)
      bottom = 0.0f;
   else if (type == SpectrogramSettings::stPeriod) {
      // special case
      const auto half = settings.GetFFTLength() / 2;
      // EAC returns no data for below this frequency:
      const float bin2 = rate / half;
      bottom = bin2;
   }
   else
      // logarithmic, etc.
      bottom = 1.0f;

   {
      float spectrumMax = mSpectrumMax;
      if (spectrumMax < 0)
         spectrumMax = settings.maxFreq;
      if (spectrumMax < 0)
         max = top;
      else
         max = std::clamp(spectrumMax, bottom, top);
   }

   {
      float spectrumMin = mSpectrumMin;
      if (spectrumMin < 0)
         spectrumMin = settings.minFreq;
      if (spectrumMin < 0)
         min = std::max(bottom, top / 1000.0f);
      else
         min = std::clamp(spectrumMin, bottom, top);
   }
}