/// <summary>
/// Initialises the WaveOut device
/// </summary>
/// <param name="waveProvider">WaveProvider to play</param>
public void Init(IWaveProvider waveProvider)
{
if (playbackState != PlaybackState.Stopped)
{
throw new InvalidOperationException("Can't re-initialize during playback");
}
if (hWaveOut != IntPtr.Zero)
{
// normally we don't allow calling Init twice, but as experiment, see if we can clean up and go again
// try to allow reuse of this waveOut device
// n.b. risky if Playback thread has not exited
DisposeBuffers();
CloseWaveOut();
}
callbackEvent = new AutoResetEvent(false);
waveStream = waveProvider;
int bufferSize = waveProvider.WaveFormat.ConvertLatencyToByteSize((DesiredLatency + NumberOfBuffers - 1) / NumberOfBuffers);
MmResult result;
lock (waveOutLock)
{
result = WaveInterop.waveOutOpenWindow(out hWaveOut, (IntPtr)DeviceNumber, waveStream.WaveFormat, callbackEvent.SafeWaitHandle.DangerousGetHandle(), IntPtr.Zero, WaveInterop.WaveInOutOpenFlags.CallbackEvent);
}
MmException.Try(result, "waveOutOpen");
buffers = new WaveOutBuffer[NumberOfBuffers];
playbackState = PlaybackState.Stopped;
for (var n = 0; n < NumberOfBuffers; n++)
{
buffers[n] = new WaveOutBuffer(hWaveOut, bufferSize, waveStream, waveOutLock);
}
}
internal MmResult WaveOutOpen(out IntPtr waveOutHandle, int deviceNumber, WaveFormat waveFormat, WaveInterop.WaveCallback callback)
{
MmResult result;
if (this.Strategy == WaveCallbackStrategy.FunctionCallback)
{
result = WaveInterop.waveOutOpen(out waveOutHandle, (IntPtr)deviceNumber, waveFormat, callback, IntPtr.Zero, WaveInterop.WaveInOutOpenFlags.CallbackFunction);
}
else
{
result = WaveInterop.waveOutOpenWindow(out waveOutHandle, (IntPtr)deviceNumber, waveFormat, this.Handle, IntPtr.Zero, WaveInterop.WaveInOutOpenFlags.CallbackWindow);
}
return(result);
}