c#基於udp實現的p2p語音聊天工具

原創性申明

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#概述

之前曾經發過文章http://www.php.cn/ #已經實現過了UDP的分包發送資料的功能，而這篇文章主要是一個應用，使用udp傳送語音和文字等資訊。在這個系統中沒有服務端和客戶端，相互通訊都是直接相互連結的。能夠很好的實現效果。

語音取得

要想傳送語音訊息，首先得獲取語音，這裡有幾種方法，一種是使用DirectX的DirectXsound來錄音，我為了簡單使用一個開源的插件NAudio來實現語音錄取。 在專案中引用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();
        }

上面的程式碼實作了錄音，並且寫入檔案p2psound_A.wav

語音傳送

取得到語音後我們要把語音傳送出去

當我們錄好音後點擊發送，這部分相關程式碼是

 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();
                }
            }
        }

如此一來我們就把產生的語音檔案發送出去了

語音的接收與播放

#其實語音的接收與文字訊息的接收沒有什麼不同，只不過語音發送的時候是以二進制發送的，因此我們在收到語音後就應該寫入到一個文件裡面去，接收完成後，播放這段語音就行了。

下面這段程式碼主要是把收到的資料保存到檔案中去，這個函數式我的NetFrame裡收到訊息時所觸發的事件，在文章前面提過的那篇文章裡

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);
            }
        }

#收到語音訊息後，我們要進行播放，播放時仍然用剛才那個外掛程式播放

//--------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);
        }

#在上面示範了接收和發送一段語音訊息的介面

技術總結

主要用到的技術就是UDP和NAudio的錄音和播放功能

 以上就是c#基於udp實現的p2p語音聊天工具的內容，更多相關內容請關注PHP中文網（www.php.cn ）！

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