StephaneLenclud@273: using System;
StephaneLenclud@273: using System.Collections.Generic;
StephaneLenclud@273: using CSCore.DSP;
StephaneLenclud@273: 
StephaneLenclud@273: namespace Visualization
StephaneLenclud@273: {
StephaneLenclud@273:     /// <summary>
StephaneLenclud@273:     ///     BasicSpectrumProvider
StephaneLenclud@273:     /// </summary>
StephaneLenclud@273:     public class BasicSpectrumProvider : FftProvider, ISpectrumProvider
StephaneLenclud@273:     {
StephaneLenclud@273:         private readonly int _sampleRate;
StephaneLenclud@273:         private readonly List<object> _contexts = new List<object>();
StephaneLenclud@273: 
StephaneLenclud@273:         public BasicSpectrumProvider(int channels, int sampleRate, FftSize fftSize)
StephaneLenclud@273:             : base(channels, fftSize)
StephaneLenclud@273:         {
StephaneLenclud@273:             if (sampleRate <= 0)
StephaneLenclud@273:                 throw new ArgumentOutOfRangeException("sampleRate");
StephaneLenclud@273:             _sampleRate = sampleRate;
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public int GetFftBandIndex(float frequency)
StephaneLenclud@273:         {
StephaneLenclud@273:             int fftSize = (int)FftSize;
StephaneLenclud@273:             double f = _sampleRate / 2.0;
StephaneLenclud@273:             // ReSharper disable once PossibleLossOfFraction
StephaneLenclud@273:             return (int)((frequency / f) * (fftSize / 2));
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public bool GetFftData(float[] fftResultBuffer, object context)
StephaneLenclud@273:         {
StephaneLenclud@273:             if (_contexts.Contains(context))
StephaneLenclud@273:                 return false;
StephaneLenclud@273: 
StephaneLenclud@273:             _contexts.Add(context);
StephaneLenclud@273:             GetFftData(fftResultBuffer);
StephaneLenclud@273:             return true;
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public override void Add(float[] samples, int count)
StephaneLenclud@273:         {
StephaneLenclud@273:             base.Add(samples, count);
StephaneLenclud@273:             if (count > 0)
StephaneLenclud@273:                 _contexts.Clear();
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public override void Add(float left, float right)
StephaneLenclud@273:         {
StephaneLenclud@273:             base.Add(left, right);
StephaneLenclud@273:             _contexts.Clear();
StephaneLenclud@273:         }
StephaneLenclud@273:     }
StephaneLenclud@273: }