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。
正文
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
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//------------------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
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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
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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
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//--------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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