js如何实现mp3录音通过websocket实时传送+简易波形图效果?
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前端实现:
引入:
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:
测试 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 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:
 
 
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