internal void Connect(WaveInterop.WaveCallback callback)
{
if (Strategy == WaveCallbackStrategy.NewWindow)
{
waveOutWindow = new WaveWindow(callback);
waveOutWindow.CreateControl();
this.Handle = waveOutWindow.Handle;
}
else if (Strategy == WaveCallbackStrategy.ExistingWindow)
{
waveOutWindowNative = new WaveWindowNative(callback);
waveOutWindowNative.AssignHandle(this.Handle);
}
}
public static IWave GetFilterWave(IFilter filterType, decimal sampleRate, WindowDelegate windowFunction)
{
WaveWindow window = new WaveWindow(windowFunction, filterType.Length);
double k = filterType.GetKCoefficient(sampleRate, filterType.CutoffFrequency);
double[] values = new double[filterType.Length];
int halfFilterLength = (filterType.Length - 1) / 2;
double twoPi = 2 * Math.PI;
for (int i = 0; i < filterType.Length; i++)
{
if (i == halfFilterLength)
{
values[i] = 2.0 / k;
}
else
{
values[i] = Math.Sin(twoPi * (i - halfFilterLength) / k) / (Math.PI * (i - halfFilterLength));
}
values[i] *= filterType.GetValue(i - halfFilterLength) * window[i];
}
return(new Wave(values, 1 / sampleRate));
}
internal void Disconnect()
{
if (waveOutWindow != null)
{
waveOutWindow.Close();
waveOutWindow = null;
}
if (waveOutWindowNative != null)
{
waveOutWindowNative.ReleaseHandle();
waveOutWindowNative = null;
}
}
