public void TriggerSampleEvent() => SampleEvent?.Invoke();
// Wrap the event in a protected virtual method
// to enable derived classes to raise the event.
protected virtual void OnRaiseSampleEvent()
{
// Raise the event by using the () operator.
SampleEvent?.Invoke(this, new SampleEventArgs("Hello"));
}
// Wrap the event in a protected virtual method
// to enable derived classes to raise the event.
protected virtual void RaiseSampleEvent()
{
// Raise the event in a thread-safe manner using the ?. operator.
SampleEvent?.Invoke(this, new SampleEventArgs("Hello"));
}
protected virtual void RaiseSampleEvent()
{
SampleEvent?.Invoke(this, new EventArgs()); //In C# 6.0 you can use the ?. operator to only raise the event when the delegate is not null
}
public virtual void OnEventSubscribed()
{
SampleEvent?.Invoke(this, EventArgs.Empty);
}
private void FrequencyBeatDetection()
{
var fftBuffer = new Complex[samples];
var spectrum = new float[samples / 2 + 1];
var beats = new List <int>();
for (var i = 0; i < samples; i++)
{
fftBuffer[i] = new Complex(samplesLeft[i], samplesRight[i]);
}
fft.Transform(fftBuffer);
for (var i = 0; i < spectrum.Length; i++)
{
spectrum[i] = (float)Math.Sqrt(Math.Pow(fftBuffer[i].Real, 2) + Math.Pow(fftBuffer[i].Imaginary, 2));
}
if (bandType == BandType.Linear)
{
var bandWidth = spectrum.Length / bandSamples.Length;
for (var band = 0; band < bandSamples.Length; band++)
{
var bandAvg = 0f;
int freq;
for (freq = 0; freq < bandWidth; freq++)
{
var ix = freq + band * bandWidth;
if (ix > spectrum.Length)
{
break;
}
bandAvg += spectrum[ix];
}
bandAvg /= freq + 1;
bandSamples[band] = bandAvg;
// TODO: Band freqs for linear
}
}
if (bandType == BandType.Logarithmic)
{
// TODO: Write these equations here
var a = (2 * spectrum.Length - 2 * bandSamples.Length * logStartBandWidth) / (float)(bandSamples.Length * (bandSamples.Length - 1));
var b = logStartBandWidth - a;
var offset = 0;
for (var band = 0; band < bandSamples.Length; band++)
{
bandFrequencies[band] = offset / SampleRatio;
var bandAvg = 0f;
var bandWidth = (int)Mathf.Floor(a * (band + 1) + b);
int spectrumBand;
for (spectrumBand = 0; spectrumBand < bandWidth; spectrumBand++)
{
if (offset + spectrumBand > spectrum.Length)
{
break;
}
bandAvg += spectrum[offset + spectrumBand];
}
bandAvg *= (spectrumBand + 1) / (float)spectrum.Length;
bandSamples[band] = bandAvg;
offset += bandWidth;
}
}
OnSample.Invoke(bandSamples);
for (var i = 0; i < bandSamples.Length; i++)
{
var averageEnergy = 0.0f;
for (var j = 0; j < energyHistory.GetLength(1); j++)
{
averageEnergy += energyHistory[i, j];
}
averageEnergy /= energyHistory.GetLength(1);
if (bandSamples[i] > averageEnergy * 1.4)
{
beats.Add(i);
}
for (var j = energyHistory.GetLength(1) - 2; j >= 0; j--)
{
energyHistory[i, j + 1] = energyHistory[i, j]; // TODO: Could make this faster without the array.
}
energyHistory[i, 0] = bandSamples[i];
if (showDebug)
{
var halfWidth = debugLineWidth * 0.5f;
var lineHeight = debugHeight * 1.5f;
var x = i * debugLineWidth - bandSamples.Length * halfWidth;
Debug.DrawLine(new Vector3(x - halfWidth, bandSamples[i] + debugHeight, 0),
new Vector3(x + halfWidth, bandSamples[i] + debugHeight, 0),
beats.Contains(i) ? Color.white : Color.red, SampleRatio);
Debug.DrawLine(new Vector3(x - halfWidth, averageEnergy + debugHeight, 0),
new Vector3(x + halfWidth, averageEnergy + debugHeight, 0),
Color.green, SampleRatio);
if (i > 0)
{
Debug.DrawLine(new Vector3(x - debugLineWidth, bandSamples[i - 1] + lineHeight, 0),
new Vector3(x, bandSamples[i] + lineHeight, 0),
Color.yellow, SampleRatio);
Debug.DrawLine(new Vector3(x - debugLineWidth, Mathf.Log(bandSamples[i - 1] + 1) + lineHeight, 0),
new Vector3(x, Mathf.Log(bandSamples[i] + 1) + lineHeight, 0),
Color.cyan, SampleRatio);
}
}
}
if (beats.Count > 0)
{
OnBeat.Invoke(beats.ToArray(), bandSamples);
}
// Debug.Log(beats.Count > 0 ? "Beat" : "No Beat");
}
// 将事件置入受保护的虚方法中，可以让派生类触发事件
protected virtual void RaiseSampleEvent()
{
// 触发事件
SampleEvent?.Invoke(this, new SampleEventArgs("Hello"));
}