/// <summary>
/// Opens the device for writing with the specified format.
/// </summary>
/// <param name="waveFormat">The format of the device to open.</param>
public void Open(WaveFormat waveFormat)
{
lock (this.startStopLock)
{
if (this.handle != null)
{
throw new InvalidOperationException("The device is already open.");
}
NativeMethods.WAVEFORMATEX wfx = new NativeMethods.WAVEFORMATEX();
wfx.nAvgBytesPerSec = waveFormat.AverageBytesPerSecond;
wfx.wBitsPerSample = waveFormat.BitsPerSample;
wfx.nBlockAlign = waveFormat.BlockAlign;
wfx.nChannels = waveFormat.Channels;
wfx.wFormatTag = (short)(int)waveFormat.FormatTag;
wfx.nSamplesPerSec = waveFormat.SamplesPerSecond;
wfx.cbSize = 0;
IntPtr tempHandle = new IntPtr();
NativeMethods.Throw(
NativeMethods.waveOutOpen(
ref tempHandle,
(uint)this.deviceId,
ref wfx,
this.callback,
(IntPtr)0,
NativeMethods.WAVEOPENFLAGS.CALLBACK_FUNCTION | NativeMethods.WAVEOPENFLAGS.WAVE_FORMAT_DIRECT),
NativeMethods.ErrorSource.WaveOut);
this.handle = new WaveOutSafeHandle(tempHandle);
lock (this.bufferingLock)
{
this.buffering = true;
Monitor.Pulse(this.bufferingLock);
}
this.bufferMaintainerThread = new Thread(new ThreadStart(this.MaintainBuffers));
this.bufferMaintainerThread.IsBackground = true;
this.bufferMaintainerThread.Name = "WaveOut MaintainBuffers thread. (DeviceID = " + this.deviceId + ")";
this.bufferMaintainerThread.Start();
}
}
/// <summary>
/// Closes the device. If the device is playing, playback is stopped.
/// </summary>
public void Close()
{
lock (this.startStopLock)
{
if (this.handle != null)
{
if (!this.handle.IsClosed && !this.handle.IsInvalid)
{
this.Stop();
lock (this.bufferingLock)
{
this.buffering = false;
Monitor.Pulse(this.bufferingLock);
}
this.bufferMaintainerThread.Join();
this.handle.Close();
this.handle = null;
}
}
}
}
