public int Close()
{
int mmr = WaveConstants.MMSYSERR_INVALHANDLE;
if (IsOpen())
{
mmr = Stop();
mmr = WaveOutput.waveOutClose(_hWaveOut);
if (mmr == WaveConstants.MMSYSERR_NOERROR)
{
Interlocked.Exchange(ref _DeviceState, (int)WaveStatus.waveClosed);
_hWaveOut = IntPtr.Zero;
_Callback = null;
}
}
return mmr;
}
public int Open(int deviceId, WaveFormat wfmt)
{
int mmr = WaveConstants.MMSYSERR_HANDLEBUSY;
if (!IsOpen())
{
_Callback = new DriverCallback(waveOutProc);
GCHandle handle = GCHandle.Alloc(_Callback);
mmr = WaveOutput.waveOutOpen(ref _hWaveOut, deviceId, ref wfmt.wfmt.Format,
Marshal.GetFunctionPointerForDelegate(_Callback),
IntPtr.Zero,
WaveConstants.CALLBACK_FUNCTION);
handle.Free();
if (mmr == WaveConstants.MMSYSERR_NOERROR)
{
Interlocked.Exchange(ref _DeviceState, (int)WaveStatus.waveStopped);
}
}
return mmr;
}
private IWaveNotifyHandler _WaveNotify; // Audio Event handler
#endregion Fields
#region Constructors
public WaveOutDevice()
{
_hWaveOut = IntPtr.Zero;
_DeviceState = (int)WaveStatus.waveClosed;
_AudioBuffers = new Dictionary<int, WaveBuffer>();
_WaveNotify = null;
_Callback = null;
}
