C#基于UDP实现的P2P语音聊天工具

语音获取

要想发送语音信息，首先得获取语音，这里有几种方法，一种是使用DirectX的DirectXsound来录音，我为了简便使用一个开源的插件NAudio来实现语音录取。 在项目中引用NAudio.dll

//------------------录音相关-----------------------------
private IWaveIn waveIn;
private WaveFileWriter writer;

private void LoadWasapiDevicesCombo()
{
var deviceEnum = new MMDeviceEnumerator();
var devices = deviceEnum.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active).ToList();
comboBox1.DataSource = devices;
comboBox1.DisplayMember = "FriendlyName";
}
private void CreateWaveInDevice()
{

waveIn = new WaveIn();
waveIn.WaveFormat = new WaveFormat(8000, 1);
waveIn.DataAvailable += OnDataAvailable;
waveIn.RecordingStopped += OnRecordingStopped;
}
void OnDataAvailable(object sender, WaveInEventArgs e)
{
if (this.InvokeRequired)
{
this.BeginInvoke(new EventHandler<WaveInEventArgs>(OnDataAvailable), sender, e);
}
else
{
writer.Write(e.Buffer, 0, e.BytesRecorded);
int secondsRecorded = (int)(writer.Length / writer.WaveFormat.AverageBytesPerSecond);
if (secondsRecorded >= 10)//最大10s
{
StopRecord();
}
else
{
l_sound.Text = secondsRecorded + " s";
}
}
}
void OnRecordingStopped(object sender, StoppedEventArgs e)
{
if (InvokeRequired)
{
BeginInvoke(new EventHandler<StoppedEventArgs>(OnRecordingStopped), sender, e);
}
else
{
FinalizeWaveFile();
}
}
void StopRecord()
{
AllChangeBtn(btn_luyin, true);
AllChangeBtn(btn_stop, false);
AllChangeBtn(btn_sendsound, true);
AllChangeBtn(btn_play, true);

//btn_luyin.Enabled = true;
//btn_stop.Enabled = false;
//btn_sendsound.Enabled = true;
//btn_play.Enabled = true;
if (waveIn != null)
waveIn.StopRecording();
//Cleanup();
}
private void Cleanup()
{
if (waveIn != null)
{
waveIn.Dispose();
waveIn = null;
}
FinalizeWaveFile();
}
private void FinalizeWaveFile()
{
if (writer != null)
{
writer.Dispose();
writer = null;
}
}
//开始录音
private void btn_luyin_Click(object sender, EventArgs e)
{
btn_stop.Enabled = true;
btn_luyin.Enabled = false;
if (waveIn == null)
{
CreateWaveInDevice();
}
if (File.Exists(soundfile))
{
File.Delete(soundfile);
}

writer = new WaveFileWriter(soundfile, waveIn.WaveFormat);
waveIn.StartRecording();
}

上面的代码实现了录音，并且写入文件p2psound_A.wav

语音发送

获取到语音后我们要把语音发送出去

当我们录好音后点击发送，这部分相关代码是

MsgTranslator tran = null;
ublic Form1()
{
InitializeComponent();
LoadWasapiDevicesCombo();//显示音频设备

Config cfg = SeiClient.GetDefaultConfig();
cfg.Port = 7777;
UDPThread udp = new UDPThread(cfg);
tran = new MsgTranslator(udp, cfg);
tran.MessageReceived += tran_MessageReceived;
tran.Debuged += new EventHandler<DebugEventArgs>(tran_Debuged);
}
private void btn_sendsound_Click(object sender, EventArgs e)
{
if (t_ip.Text == "")
{
MessageBox.Show("请输入ip");
return;
}
if (t_port.Text == "")
{
MessageBox.Show("请输入端口号");
return;
}
string ip = t_ip.Text;
int port = int.Parse(t_port.Text);
string nick = t_nick.Text;
string msg = "语音消息";

IPEndPoint remote = new IPEndPoint(IPAddress.Parse(ip), port);
Msg m = new Msg(remote, "zz", nick, Commands.SendMsg, msg, "Come From A");
m.IsRequireReceive = true;
m.ExtendMessageBytes = FileContent(soundfile);
m.PackageNo = Msg.GetRandomNumber();
m.Type = Consts.MESSAGE_BINARY;
tran.Send(m);
}
private byte[] FileContent(string fileName)
{
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
try
{
byte[] buffur = new byte[fs.Length];
fs.Read(buffur, 0, (int)fs.Length);

return buffur;
}
catch (Exception ex)
{
return null;
}
finally
{
if (fs != null)
{

//关闭资源
fs.Close();
}
}
}

如此一来我们就把产生的语音文件发送出去了

语音的接收与播放

其实语音的接收和文本消息的接收没有什么不同，只不过语音发送的时候是以二进制发送的，因此我们在收到语音后 就应该写入到一个文件里面去，接收完成后，播放这段语音就行了。

下面这段代码主要是把收到的数据保存到文件中去，这个函数式我的NetFrame里收到消息时所触发的事件，在文章前面提过的那篇文章里

void tran_MessageReceived(object sender, MessageEventArgs e)
{
Msg msg = e.msg;

if (msg.Type == Consts.MESSAGE_BINARY)
{
string m = msg.Type + "->" + msg.UserName + "发来二进制消息!";
AddServerMessage(m);
if (File.Exists(recive_soundfile))
{
File.Delete(recive_soundfile);
}
FileStream fs = new FileStream(recive_soundfile, FileMode.Create, FileAccess.Write);
fs.Write(msg.ExtendMessageBytes, 0, msg.ExtendMessageBytes.Length);
fs.Close();
//play_sound(recive_soundfile);
ChangeBtn(true);

}
else
{
string m = msg.Type + "->" + msg.UserName + "说:" + msg.NormalMsg;
AddServerMessage(m);
}
}

收到语音消息后，我们要进行播放，播放时仍然用刚才那个插件播放

//--------播放部分----------
private IWavePlayer wavePlayer;
private WaveStream reader;

public void play_sound(string filename)
{
if (wavePlayer != null)
{
wavePlayer.Dispose();
wavePlayer = null;
}
if (reader != null)
{
reader.Dispose();
}
reader = new MediaFoundationReader(filename, new MediaFoundationReader.MediaFoundationReaderSettings() { SingleReaderObject = true });

if (wavePlayer == null)
{

wavePlayer = new WaveOut();
wavePlayer.PlaybackStopped += WavePlayerOnPlaybackStopped;
wavePlayer.Init(reader);
}
wavePlayer.Play();
}
private void WavePlayerOnPlaybackStopped(object sender, StoppedEventArgs stoppedEventArgs)
{
if (stoppedEventArgs.Exception != null)
{
MessageBox.Show(stoppedEventArgs.Exception.Message);
}
if (wavePlayer != null)
{
wavePlayer.Stop();
}
btn_luyin.Enabled = true;
}private void btn_play_Click(object sender, EventArgs e)
{
btn_luyin.Enabled = false;
play_sound(soundfile);
}

在上面演示了接收和发送一段语音消息的界面

技术总结

主要用到的技术就是UDP和NAudio的录音和播放功能

希望这篇文章能够给大家提供一个思路，帮助大家实现P2P语音聊天工具。

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