Posted in Javascript onJune 12, 2020
波形图：https://3water.com/article/188545.htm
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：
总结
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js实现mp3录音通过websocket实时传送+简易波形图效果
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