c#基于udp实现的p2p语音聊天工具

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概述

之前发过一篇文章http://www.php.cn/ 已经实现过了UDP的分包发送数据的功能，而这篇文章主要是一个应用，使用udp传送语音和文本等信息。在这个系统中没有服务端和客户端，相互通讯都是直接相互联系的。能够很好的实现效果。

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;
 public 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

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