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。