js实现mp3录音通过websocket实时传送+简易波形图效果

firejq

2020-06-14

废话：想不到我的第一篇博客是关于前端，作为一名后端的小菜，前端方面肯定还有很多不足之处，如果文章有任何问题欢迎指正。感谢大家。好了！废话不多说下面讲一下需求。

需求：公司要求实现web端的录音并通过websocket实时上传至java后台，而且能通过vlc实时播放，简单一点讲就是我用网页在那一边讲话，一个大喇叭就能实时把我的话播出去，这样是不是通俗易懂呀，而且呢公司要求用mp3格式。当然啦！为了知道自己在讲话需要一个波形图，这里主要实现前半部分功能，后半部分臣妾也做不到呀！后半部分的vlc播放呢如果大家想知道，可以留言，届时可以给大家指条明路

前端实现：

引入：

<script type="text/javascript" src="/js/recorder/recordmp3.js"></script>

这个跟大佬的js有点不一样，我在里面加了一点东西，而且在这个js里面引入了两个另外的js，lame.min.js和worker-realtime.js，这俩在大佬的代码里有

页面：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=gb2312"/>
 <title>测试</title>
</head>
<body>
<button id="intercomBegin">开始对讲</button>
<button id="intercomEnd">关闭对讲</button>
<canvas id="casvased" style="width: 400px;height: 100px"></canvas>
</body>
<script type="text/javascript" src="/js/jquery-3.3.1.js"></script>
<script type="text/javascript" src="/js/recorder/recordmp3.js"></script>
<script type="text/javascript">
 var begin = document.getElementById('intercomBegin');
 var end = document.getElementById('intercomEnd');

 var canvas = document.getElementById("casvased");
 var canvasCtx = canvas.getContext("2d");

 var ws = null; //实现WebSocket

 var recorder;

 /*
 * WebSocket
 */
 function useWebSocket() {
  ws = new WebSocket("ws://127.0.0.1:8089/send/voice");
  ws.binaryType = 'arraybuffer'; //传输的是 ArrayBuffer 类型的数据
  ws.onopen = function () {
   console.log('握手成功');
   if (ws.readyState == 1) { //ws进入连接状态，则每隔500毫秒发送一包数据
    recorder.start();
   }
  };

  ws.onmessage = function (msg) {
   console.info(msg)
  }

  ws.onerror = function (err) {
   console.info(err)
  }
 }

 /*
 * 开始对讲
 */
 begin.onclick = function () {
  recorder = new MP3Recorder({
   debug: true,
   funOk: function () {
    console.log('点击录制，开始录音！ ');
   },
   funCancel: function (msg) {
    console.log(msg);
    recorder = null;
   }
  });
 }

 /*
 * 关闭对讲
 */
 end.onclick = function () {
  if (ws) {
   ws.close();
   recorder.stop();
   console.log('关闭对讲以及WebSocket');
  }
 }

 var sendData = function() { //对以获取的数据进行处理(分包)
  var reader = new FileReader();
  reader.onload = e => {
   var outbuffer = e.target.result;
   var arr = new Int8Array(outbuffer);
   if (arr.length > 0) {
    var tmparr = new Int8Array(1024);
    var j = 0;
    for (var i = 0; i < arr.byteLength; i++) {
     tmparr[j++] = arr[i];
     if (((i + 1) % 1024) == 0) {
      ws.send(tmparr);
      if (arr.byteLength - i - 1 >= 1024) {
       tmparr = new Int8Array(1024);
      } else {
       tmparr = new Int8Array(arr.byteLength - i - 1);
      }
      j = 0;
     }
     if ((i + 1 == arr.byteLength) && ((i + 1) % 1024) != 0) {
      ws.send(tmparr);
     }
    }
   }
  };
  recorder.getMp3Blob(function (blob) {
   reader.readAsArrayBuffer(blob);//这里拿到mp3格式的音频流写入到reader中
  })
 }; </script> </html>
recordmp3.js

(function (exports) {

 var MP3Recorder = function (config) {

  var recorder = this;
  config = config || {};
  config.sampleRate = config.sampleRate || 44100;
  config.bitRate = config.bitRate || 128;

  navigator.getUserMedia = navigator.getUserMedia ||
   navigator.webkitGetUserMedia ||
   navigator.mozGetUserMedia ||
   navigator.msGetUserMedia;

  if (navigator.getUserMedia) {
   navigator.getUserMedia({
     audio: true
    },
    function (stream) {
     var context = new AudioContext(),
      microphone = context.createMediaStreamSource(stream),
      processor = context.createScriptProcessor(16384, 1, 1),//bufferSize大小，输入channel数，输出channel数
      mp3ReceiveSuccess, currentErrorCallback;

     var height = 100;
     var width = 400;

     const analyser = context.createAnalyser()
     analyser.fftSize = 1024
     //连接到音频源
     microphone.connect(analyser);
     analyser.connect(context.destination);

     const bufferLength = analyser.frequencyBinCount // 返回的是 analyser的fftsize的一半
     const dataArray = new Uint8Array(bufferLength);

     function draw() {
      canvasCtx.clearRect(0, 0, width, height); //清除画布
      analyser.getByteFrequencyData(dataArray); // 将当前频率数据复制到传入其中的Uint8Array
      const requestAnimFrame = window.requestAnimationFrame(draw) || window.webkitRequestAnimationFrame(draw);
      canvasCtx.fillStyle = '#000130';
      canvasCtx.fillRect(0, 0, width, height);
      let barWidth = (width / bufferLength) * 2;
      let barHeight;
      let x = 0;
      let c = 2
      for (let i = 0; i < bufferLength; i++) {
       barHeight = c+(dataArray[i]/400)*height;
       canvasCtx.fillStyle = 'rgb(0, 255, 30)';
       canvasCtx.fillRect(x, height / 2 - barHeight / 2, barWidth, barHeight);
       x += barWidth + 1;
      }
     }

     draw();

     useWebSocket();
     config.sampleRate = context.sampleRate;
     processor.onaudioprocess = function (event) {
      //边录音边转换
      var array = event.inputBuffer.getChannelData(0);
      realTimeWorker.postMessage({cmd: 'encode', buf: array});
      sendData();
     };

     var realTimeWorker = new Worker('/js/recorder/worker-realtime.js');
     realTimeWorker.onmessage = function (e) {
      switch (e.data.cmd) {
       case 'init':
        log('初始化成功');
        if (config.funOk) {
         config.funOk();
        }
        break;
       case 'end':
        log('MP3大小：', e.data.buf.length);
        if (mp3ReceiveSuccess) {
         mp3ReceiveSuccess(new Blob(e.data.buf, {type: 'audio/mp3'}));
        }
        break;
       case 'error':
        log('错误信息：' + e.data.error);
        if (currentErrorCallback) {
         currentErrorCallback(e.data.error);
        }
        break;
       default:
        log('未知信息：', e.data);
      }
     };

     recorder.getMp3Blob = function (onSuccess, onError) {
      currentErrorCallback = onError;
      mp3ReceiveSuccess = onSuccess;
      realTimeWorker.postMessage({cmd: 'finish'});
     };

     recorder.start = function () {
      if (processor && microphone) {
       microphone.connect(processor);
       processor.connect(context.destination);
       log('开始录音');
      }
     }

     recorder.stop = function () {
      if (processor && microphone) {
       microphone.disconnect();
       processor.disconnect();
       log('录音结束');
      }
     }

     realTimeWorker.postMessage({
      cmd: 'init',
      config: {
       sampleRate: config.sampleRate,
       bitRate: config.bitRate
      }
     });
    },
    function (error) {
     var msg;
     switch (error.code || error.name) {
      case 'PERMISSION_DENIED':
      case 'PermissionDeniedError':
       msg = '用户拒绝访问麦客风';
       break;
      case 'NOT_SUPPORTED_ERROR':
      case 'NotSupportedError':
       msg = '浏览器不支持麦客风';
       break;
      case 'MANDATORY_UNSATISFIED_ERROR':
      case 'MandatoryUnsatisfiedError':
       msg = '找不到麦客风设备';
       break;
      default:
       msg = '无法打开麦克风，异常信息:' + (error.code || error.name);
       break;
     }
     if (config.funCancel) {
      config.funCancel(msg);
     }
    });
  } else {
   if (config.funCancel) {
    config.funCancel('当前浏览器不支持录音功能');
   }
  }

  function log(str) {
   if (config.debug) {
    console.log(str);
   }
  }
 }

 exports.MP3Recorder = MP3Recorder;

})(window);

后端websocket：
这里实现的是保存为mp3文件

package com.jetosend.common.socket;

import com.jetosend.common.utils.Utils;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.*;
import java.nio.ByteBuffer;
import java.util.Hashtable;
import java.util.Map;

@ServerEndpoint("/send/{key}")
@Component
public class ServerSocket {

 private static final Map<String, Session> connections = new Hashtable<>();
 ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

 /***
  * @Description:打开连接
  * @Param: [id, 保存对方平台的资源编码
  * session]
  * @Return: void
  * @Author: Liting
  * @Date: 2019-10-10 09:22
  */
 @OnOpen
 public void onOpen(@PathParam("key") String id, Session session) {
  System.out.println(id + "连上了");
  connections.put(id, session);
 }

 /**
  * 接收消息
  */
 @OnMessage
 public void onMessage(@PathParam("key") String id, InputStream inputStream) {
  System.out.println("来自" + id);
  try {
   int rc = 0;
   byte[] buff = new byte[100];
   while ((rc = inputStream.read(buff, 0, 100)) > 0) {
    byteArrayOutputStream.write(buff, 0, rc);
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /**
  * 异常处理
  *
  * @param throwable
  */
 @OnError
 public void onError(Throwable throwable) {
  throwable.printStackTrace();
  //TODO 日志打印异常
 }

 /**
  * 关闭连接
  */
 @OnClose
 public void onClose(@PathParam("key") String id) {
  System.out.println(id + "断开");
  BufferedOutputStream bos = null;
  FileOutputStream fos = null;
  File file = null;
  try {
   file = new File("D:\\testtest.mp3");

   //输出流
   fos = new FileOutputStream(file);

   //缓冲流
   bos = new BufferedOutputStream(fos);

   //将字节数组写出
   bos.write(byteArrayOutputStream.toByteArray());
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   if (bos != null) {
    try {
     bos.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
   if (fos != null) {
    try {
     fos.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }

  connections.remove(id);
 }

实现效果：

js实现mp3录音通过websocket实时传送+简易波形图效果

总结

websocket js js代码 ws

安科网

js实现mp3录音通过websocket实时传送+简易波形图效果

firejq

firejq

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