public Clapper()
{
// for pumping XNA framework events
t = new Timer()
{
Interval = 50,
};
t.Tick += new EventHandler(t_Tick);
UpperThreshold = 3000;
LowerThreshold = 800;
state = ClapperState.WaitLow;
eventWatch = new Stopwatch();
window = new Queue<short>();
m = Microphone.Default;
buffer = new byte[m.GetSampleSizeInBytes(TimeSpan.FromMilliseconds(100))];
m.BufferReady += new EventHandler<EventArgs>(m_BufferReady);
}
// This isn't great but the idea is that
// there must be two peaks separated by more than 100ms
// and those peaks must be within 1 second
void StateCheck(short v)
{
if (eventWatch.ElapsedMilliseconds > 1000)
{
Debug.WriteLine("Timeout: Reset State");
state = ClapperState.WaitLow;
eventWatch.Reset();
}
switch (state)
{
case ClapperState.WaitLow:
if (v > UpperThreshold)
{
Debug.WriteLine("WL1 {0}", v);
state = ClapperState.WaitHigh;
eventWatch.Start();
}
break;
case ClapperState.WaitHigh:
if (v < LowerThreshold &&
eventWatch.ElapsedMilliseconds > 50)
{
Debug.WriteLine("WH1 {0}", v);
state = ClapperState.WaitLow2;
eventWatch.Restart();
}
break;
case ClapperState.WaitLow2:
if (v > UpperThreshold &&
eventWatch.ElapsedMilliseconds > 100)
{
Debug.WriteLine("WL2 {0}", v);
state = ClapperState.WaitHigh2;
eventWatch.Restart();
}
break;
case ClapperState.WaitHigh2:
if (v < LowerThreshold &&
eventWatch.ElapsedMilliseconds > 50)
{
Debug.WriteLine("WH2 {0}", v);
state = ClapperState.WaitLow;
eventWatch.Reset();
if (OnClap != null)
{
OnClap(this, new ClapperEventArgs());
}
}
break;
}
}
