FFTStreamHandlerFields.cs

using FrooxEngine;
using Elements.Assets;
using CSCore.DSP;
using Elements.Core;

namespace Resonance;

public partial class FFTStreamHandler(UserAudioStream<StereoSample> stream, FFTStreamSettings settings)
{
    public static Dictionary<UserAudioStream<StereoSample>, FFTStreamHandler> FFTDict = new();
    public readonly UserAudioStream<StereoSample> UserStream = stream ?? throw new NullReferenceException("FFTStreamHandler REQUIRES a UserAudioStream instance!");
    public bool Initialized { get; private set; }
    private float AutoGain => Settings.AutoGain_Enabled ? autoGainFactor : Settings.GraphGain;
    private float autoGainFactor = 1f;
    public FFTStreamSettings Settings => settings;

    // FFT Data & handling
    private readonly float[] fftData = new float[settings.FftWidthCount];
    private readonly float[] lastFftData = new float[settings.FftWidthCount];
    public readonly ValueStream<float>[] binStreams = new ValueStream<float>[settings.BinSize];
    public readonly ValueStream<float>[] bandStreams = new ValueStream<float>[BAND_RANGES.Length];
    private float[]? gainLookup;
    private float[]? freqLookup;
    private readonly FftProvider fftProvider = new(2, settings.FftWidth) { WindowFunction = WindowFunctions.Hamming };

    // World stuff
    public DynamicVariableSpace? WorkingSpace { get; private set; }
    public Slot? VariableSlot { get; private set; }

    // Constants
    public const string WIDTH_VARIABLE = "fft_stream_width";
    public const string BINSIZE_VARIABLE = "fft_bin_size";
    public const string NORMALIZED_VARIABLE = "fft_data_normalized";
    public static readonly float[] BAND_RANGES = { 20, 60, 250, 500, 2000, 4000, 6000, 20000 };
}