js實現(xiàn)mp3錄音通過websocket實時傳送+簡易波形圖效果

更新時間：2020年06月12日 08:52:08 作者：麥葉

這篇文章主要介紹了js實現(xiàn)mp3錄音通過websocket實時傳送+簡易波形圖效果，本文通過實例代碼給大家介紹的非常詳細對大家的學習或工作具有一定的參考借鑒價值,需要的朋友可以參考下

波形圖：http://www.dbjr.com.cn/article/188545.htm

廢話：想不到我的第一篇博客是關于前端，作為一名后端的小菜，前端方面肯定還有很多不足之處，如果文章有任何問題歡迎指正。感謝大家。好了！廢話不多說下面講一下需求。

需求：公司要求實現(xiàn)web端的錄音并通過websocket實時上傳至java后臺，而且能通過vlc實時播放，簡單一點講就是我用網(wǎng)頁在那一邊講話，一個大喇叭就能實時把我的話播出去，這樣是不是通俗易懂呀，而且呢公司要求用mp3格式。當然啦！為了知道自己在講話需要一個波形圖，這里主要實現(xiàn)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，屆時可以給大家指條明路

前端實現(xiàn)：

引入：

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

這個跟大佬的js有點不一樣，我在里面加了一點東西，而且在這個js里面引入了兩個另外的js，lame.min.js和worker-realtime.js，這倆在大佬的代碼里有

頁面：

<!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>測試</title>
</head>
<body>
<button id="intercomBegin">開始對講</button>
<button id="intercomEnd">關閉對講</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; //實現(xiàn)WebSocket

 var recorder;

 /*
 * WebSocket
 */
 function useWebSocket() {
  ws = new WebSocket("ws://127.0.0.1:8089/send/voice");
  ws.binaryType = 'arraybuffer'; //傳輸?shù)氖?ArrayBuffer 類型的數(shù)據(jù)
  ws.onopen = function () {
   console.log('握手成功');
   if (ws.readyState == 1) { //ws進入連接狀態(tài)，則每隔500毫秒發(fā)送一包數(shù)據(jù)
    recorder.start();
   }
  };

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

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

 /*
 * 開始對講
 */
 begin.onclick = function () {
  recorder = new MP3Recorder({
   debug: true,
   funOk: function () {
    console.log('點擊錄制，開始錄音！ ');
   },
   funCancel: function (msg) {
    console.log(msg);
    recorder = null;
   }
  });
 }

 /*
 * 關閉對講
 */
 end.onclick = function () {
  if (ws) {
   ws.close();
   recorder.stop();
   console.log('關閉對講以及WebSocket');
  }
 }

 var sendData = function() { //對以獲取的數(shù)據(jù)進行處理(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);//這里拿到mp3格式的音頻流寫入到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，輸入channel數(shù)，輸出channel數(shù)
      mp3ReceiveSuccess, currentErrorCallback;

     var height = 100;
     var width = 400;

     const analyser = context.createAnalyser()
     analyser.fftSize = 1024
     //連接到音頻源
     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); //清除畫布
      analyser.getByteFrequencyData(dataArray); // 將當前頻率數(shù)據(jù)復制到傳入其中的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) {
      //邊錄音邊轉換
      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?。?, e.data.buf.length);
        if (mp3ReceiveSuccess) {
         mp3ReceiveSuccess(new Blob(e.data.buf, {type: 'audio/mp3'}));
        }
        break;
       case 'error':
        log('錯誤信息：' + 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('開始錄音');
      }
     }

     recorder.stop = function () {
      if (processor && microphone) {
       microphone.disconnect();
       processor.disconnect();
       log('錄音結束');
      }
     }

     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 = '用戶拒絕訪問麥客風';
       break;
      case 'NOT_SUPPORTED_ERROR':
      case 'NotSupportedError':
       msg = '瀏覽器不支持麥客風';
       break;
      case 'MANDATORY_UNSATISFIED_ERROR':
      case 'MandatoryUnsatisfiedError':
       msg = '找不到麥客風設備';
       break;
      default:
       msg = '無法打開麥克風，異常信息:' + (error.code || error.name);
       break;
     }
     if (config.funCancel) {
      config.funCancel(msg);
     }
    });
  } else {
   if (config.funCancel) {
    config.funCancel('當前瀏覽器不支持錄音功能');
   }
  }

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

 exports.MP3Recorder = MP3Recorder;

})(window);

后端websocket：
這里實現(xiàn)的是保存為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:打開連接
  * @Param: [id, 保存對方平臺的資源編碼
  * 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 + "連上了");
  connections.put(id, session);
 }

 /**
  * 接收消息
  */
 @OnMessage
 public void onMessage(@PathParam("key") String id, InputStream inputStream) {
  System.out.println("來自" + 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();
  }
 }

 /**
  * 異常處理
  *
  * @param throwable
  */
 @OnError
 public void onError(Throwable throwable) {
  throwable.printStackTrace();
  //TODO 日志打印異常
 }

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

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

   //緩沖流
   bos = new BufferedOutputStream(fos);

   //將字節(jié)數(shù)組寫出
   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);
 }

實現(xiàn)效果：