Playback a sound in two or three devices at the same time

Question

Hello

I have a playback function,this function allows me to play sound in a specific device. I want to play sound in two or in three devices at the same time,I tried to change my code but I didn't find a suitable solution. Can you help me please?

This is my playback function:

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using NAudio.Wave;
using NAudio.CoreAudioApi;

namespace PaGa
{
public partial class PlaybackForm : Form
{
IWavePlayer waveOut;
string fileName = null;
WaveStream mainOutputStream;
WaveChannel32 volumeStream;
int _deviceNum;
public PlaybackForm(int deviceNum)
{
InitializeComponent();
_deviceNum = deviceNum;
}

private void buttonPlay_Click(object sender, EventArgs e)
{
if (waveOut != null)
{
if (waveOut.PlaybackState == PlaybackState.Playing)
{
return;
}
else if (waveOut.PlaybackState == PlaybackState.Paused)
{
waveOut.Play();
return;
}
}

// we are in a stopped state
// TODO: only re-initialise if necessary

if (String.IsNullOrEmpty(fileName))
{
toolStripButtonOpenFile_Click(sender, e);
}
if (String.IsNullOrEmpty(fileName))
{
return;
}

try
{
CreateWaveOut();
}
catch (Exception driverCreateException)
{
MessageBox.Show(String.Format("{0}", driverCreateException.Message));
return;
}

mainOutputStream = CreateInputStream(fileName);
trackBarPosition.Maximum = (int)mainOutputStream.TotalTime.TotalSeconds;
labelTotalTime.Text = String.Format("{0:00}:{1:00}", (int)mainOutputStream.TotalTime.TotalMinutes,
mainOutputStream.TotalTime.Seconds);
trackBarPosition.TickFrequency = trackBarPosition.Maximum / 30;

try
{
waveOut.Init(mainOutputStream);
}
catch (Exception initException)
{
MessageBox.Show(String.Format("{0}", initException.Message), "Error Initializing Output");
return;
}

// not doing Volume on IWavePlayer any more
volumeStream.Volume = volumeSlider1.Volume;
waveOut.Play();
}

private WaveStream CreateInputStream(string fileName)
{
WaveChannel32 inputStream;
if (fileName.EndsWith(".wav"))
{
WaveStream readerStream = new WaveFileReader(fileName);
if (readerStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
{
readerStream = WaveFormatConversionStream.CreatePcmStream(readerStream);
readerStream = new BlockAlignReductionStream(readerStream);
}
if (readerStream.WaveFormat.BitsPerSample != 16)
{
var format = new WaveFormat(readerStream.WaveFormat.SampleRate,
16, readerStream.WaveFormat.Channels);
readerStream = new WaveFormatConversionStream(format, readerStream);
}
inputStream = new WaveChannel32(readerStream);
}
else if (fileName.EndsWith(".mp3"))
{
WaveStream mp3Reader = new Mp3FileReader(fileName);
WaveStream pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader);
WaveStream blockAlignedStream = new BlockAlignReductionStream(pcmStream);
inputStream = new WaveChannel32(blockAlignedStream);
}
else
{
throw new InvalidOperationException("Unsupported extension");
}
// we are not going into a mixer so we don't need to zero pad
//((WaveChannel32)inputStream).PadWithZeroes = false;
volumeStream = inputStream;
var meteringStream = new MeteringStream(inputStream, inputStream.WaveFormat.SampleRate / 10);
meteringStream.StreamVolume += new EventHandler<StreamVolumeEventArgs>(meteringStream_StreamVolume);

return meteringStream;
}

void meteringStream_StreamVolume(object sender, StreamVolumeEventArgs e)
{
volumeMeter1.Amplitude = e.MaxSampleValues[0];
waveformPainter1.AddMax(e.MaxSampleValues[0]);
if (e.MaxSampleValues.Length > 1)
{
volumeMeter2.Amplitude = e.MaxSampleValues[1];
waveformPainter2.AddMax(e.MaxSampleValues[1]);
}

}

private void CreateWaveOut()
{
CloseWaveOut();
int latency = (int)comboBoxLatency.SelectedItem;
//if (radioButtonWaveOut.Checked)
{
//WaveCallbackInfo callbackInfo = checkBoxWaveOutWindow.Checked ?
WaveCallbackInfo callbackInfo = WaveCallbackInfo.FunctionCallback();
// WaveCallbackInfo callbackInfo = WaveCallbackInfo.FunctionCallback();

// WaveCallbackInfo.NewWindow(): WaveCallbackInfo.FunctionCallback();
WaveOut outputDevice = new WaveOut(callbackInfo);
outputDevice.DesiredLatency = latency;
outputDevice.DeviceNumber = _deviceNum;
waveOut = outputDevice;
}

}

private void CloseWaveOut()
{
if (waveOut != null)
{
waveOut.Stop();
}
if (mainOutputStream != null)
{
// this one really closes the file and ACM conversion
volumeStream.Close();
volumeStream = null;
// this one does the metering stream
mainOutputStream.Close();
mainOutputStream = null;
}
if (waveOut != null)
{
waveOut.Dispose();
waveOut = null;
}
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
CloseWaveOut();
}

private void Form1_Load(object sender, EventArgs e)
{
comboBoxLatency.Items.Add(25);
comboBoxLatency.Items.Add(50);
comboBoxLatency.Items.Add(100);
comboBoxLatency.Items.Add(150);
comboBoxLatency.Items.Add(200);
comboBoxLatency.Items.Add(300);
comboBoxLatency.Items.Add(400);
comboBoxLatency.Items.Add(500);
comboBoxLatency.SelectedIndex = 5;
}

private void buttonPause_Click(object sender, EventArgs e)
{
if (waveOut != null)
{
if (waveOut.PlaybackState == PlaybackState.Playing)
{
waveOut.Pause();
}
}
}

private void volumeSlider1_VolumeChanged(object sender, EventArgs e)
{
if (mainOutputStream != null)
{
volumeStream.Volume = volumeSlider1.Volume;
}
}

private void buttonControlPanel_Click(object sender, EventArgs e)
{
AsioOut asio = waveOut as AsioOut;
if (asio != null)
{
asio.ShowControlPanel();
}
}

private void buttonStop_Click(object sender, EventArgs e)
{
if (waveOut != null)
{
waveOut.Stop();
trackBarPosition.Value = 0;
}
}

private void timer1_Tick(object sender, EventArgs e)
{
if (waveOut != null)
{
if (mainOutputStream.Position >= mainOutputStream.Length)
{
buttonStop_Click(sender, e);
}
else
{
TimeSpan currentTime = mainOutputStream.CurrentTime;
trackBarPosition.Value = (int)currentTime.TotalSeconds;
labelCurrentTime.Text = String.Format("{0:00}:{1:00}", (int)currentTime.TotalMinutes,
currentTime.Seconds);
}
}
}

private void trackBarPosition_Scroll(object sender, EventArgs e)
{
if (waveOut != null)
{

mainOutputStream.CurrentTime = TimeSpan.FromSeconds(trackBarPosition.Value);
}
}

private void toolStripButtonOpenFile_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "All Supported Files (*.wav, *.mp3)|*.wav;*.mp3|All Files (*.*)|*.*";
openFileDialog.FilterIndex = 1;
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
fileName = openFileDialog.FileName;
}
}}}
And this is how I use this function in my principal form:

private void btnPlayBack1_Click(object sender, EventArgs e)
{
PlaybackForm playbackform1 = new PlaybackForm(1);
playbackform1.ShowDialog();
}

private void btnPlayBack2_Click(object sender, EventArgs e)
{
PlaybackForm playbackform2 = new PlaybackForm(2);
playbackform2.ShowDialog();
}

private void btnPlayBack3_Click(object sender, EventArgs e)
{
PlaybackForm playbackform3 = new PlaybackForm(3);
playbackform3.ShowDialog();
}
I posted my code just to let you understand clearly my problem.I really need your help and thank you in advance.