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Assets/WasapiAudio/Scripts/Core/BasicSpectrumProvider.cs

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+using System;
+using System.Collections.Generic;
+using CSCore.DSP;
+
+namespace Assets.WasapiAudio.Scripts.Core
+{
+    /// <summary>
+    ///     BasicSpectrumProvider
+    /// </summary>
+    public class BasicSpectrumProvider : FftProvider, ISpectrumProvider
+    {
+        private readonly int _sampleRate;
+        private readonly List<object> _contexts = new List<object>();
+
+        public BasicSpectrumProvider(int channels, int sampleRate, FftSize fftSize)
+            : base(channels, fftSize)
+        {
+            if (sampleRate <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(sampleRate));
+            }
+
+            _sampleRate = sampleRate;
+        }
+
+        public int GetFftBandIndex(float frequency)
+        {
+            int fftSize = (int)FftSize;
+            double f = _sampleRate / 2.0;
+            // ReSharper disable once PossibleLossOfFraction
+            return (int)((frequency / f) * (fftSize / 2));
+        }
+
+        public bool GetFftData(float[] fftResultBuffer, object context)
+        {
+            if (_contexts.Contains(context))
+                return false;
+
+            _contexts.Add(context);
+            GetFftData(fftResultBuffer);
+            return true;
+        }
+
+        public override void Add(float[] samples, int count)
+        {
+            base.Add(samples, count);
+
+            if (count > 0)
+            {
+                _contexts.Clear();
+            }
+        }
+
+        public override void Add(float left, float right)
+        {
+            base.Add(left, right);
+            _contexts.Clear();
+        }
+    }
+}