fastFourrierTransform.hpp

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#ifndef FFT_MODE_H
#define FFT_MODE_H
 
 
#include "src/modes/include/colors/palettes.hpp"
#include "src/modes/include/audio/utils.hpp"
 
namespace lampda::modes::default_modes {
 
struct FastFourrierTransformMode : public BasicMode
{
  static constexpr auto palette = colors::PalettePartyColors;
 
  static void loop(auto& ctx)
  {
    const uint16_t cols = ctx.lamp.maxWidth - 1;
    const uint16_t rows = ctx.lamp.maxHeight;
    auto& state = ctx.state;
    state.soundEvent.update(ctx);
 
    const auto& fft_log = state.soundEvent.fft_log;
    const float maxFftVal = state.soundEvent.maxAmplitude;
 
    // adjust for volume
    const float maxLevel = lmpd_map<float>(state.soundEvent.level,
                                           physical::microphone::silenceLevelDb * 0.4,
                                           physical::microphone::highLevelDb,
                                           0.0,
                                           1.0);
    const float maxDisplaylevel = std::max<float>(2, lmpd_constrain<float>(maxLevel * rows, 2, rows));
 
    for (uint8_t x = 0; x < cols; ++x)
    {
      const uint8_t mappedX =
              lmpd_map<uint8_t>(x, 0, cols, 0, physical::microphone::SoundStruct::numberOfFFtChanels - 1);
      const uint8_t mappedY = lmpd_constrain<uint8_t>(
              lmpd_map<uint8_t>(fft_log[mappedX], 0, maxFftVal, 2, maxDisplaylevel), 2, maxDisplaylevel);
      for (uint8_t y = 0; y <= mappedY; y++)
      {
        uint8_t colorIndex = lmpd_map<uint8_t>(y, 0, rows - 1, 0, 255);
 
        const auto& ledColor = colors::from_palette<false, uint8_t>(colorIndex, palette);
        ctx.lamp.setPixelColorXY(x, rows - y, ledColor);
      }
      // set rest to black
      for (uint8_t y = mappedY; y <= rows; ++y)
        ctx.lamp.setPixelColorXY(x, rows - y, 0);
    }
  }
 
  static void on_enter_mode(auto& ctx) { ctx.state.soundEvent.reset(ctx); }
 
  struct StateTy
  {
    audio::SoundEventTy<> soundEvent;
  };
};
 
} // namespace lampda::modes::default_modes
 
#endif