websocket探索其与语音,图片的力量

by admin on 2019年1月31日

websocket探索其与话音、图片的能力

2015/12/26 · JavaScript
· 3 评论 ·
websocket

初稿出处:
AlloyTeam   

说到websocket想比大家不会陌生,若是陌生的话也没提到,一句话概括

“WebSocket protocol
是HTML5一种新的情商。它完结了浏览器与服务器全双工通讯”

WebSocket相相比传统那多少个服务器推技术几乎好了太多,大家可以挥手向comet和长轮询那一个技巧说拜拜啦,庆幸大家生存在拥有HTML5的时期~

这篇小说我们将分三局地探索websocket

先是是websocket的广阔使用,其次是截然自己创立服务器端websocket,最后是必不可缺介绍利用websocket制作的四个demo,传输图片和在线语音聊天室,let’s
go

一、websocket常见用法

此间介绍二种自己觉着大规模的websocket达成……(瞩目:本文建立在node上下文环境

1、socket.io

先给demo

JavaScript

var http = require(‘http’); var io = require(‘socket.io’); var server =
http.createServer(function(req, res) { res.writeHeader(200,
{‘content-type’: ‘text/html;charset=”utf-8″‘}); res.end();
}).listen(8888); var socket =.io.listen(server);
socket.sockets.on(‘connection’, function(socket) { socket.emit(‘xxx’,
{options}); socket.on(‘xxx’, function(data) { // do someting }); });

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var http = require(‘http’);
var io = require(‘socket.io’);
 
var server = http.createServer(function(req, res) {
    res.writeHeader(200, {‘content-type’: ‘text/html;charset="utf-8"’});
    res.end();
}).listen(8888);
 
var socket =.io.listen(server);
 
socket.sockets.on(‘connection’, function(socket) {
    socket.emit(‘xxx’, {options});
 
    socket.on(‘xxx’, function(data) {
        // do someting
    });
});

深信不疑通晓websocket的同班不容许不领悟socket.io,因为socket.io太知名了,也很棒,它自身对过期、握手等都做了处理。我揣度这也是促成websocket使用最多的不二法门。socket.io最最最地道的某些就是优雅降级,当浏览器不协助websocket时,它会在中间优雅降级为长轮询等,用户和开发者是不必要关怀具体贯彻的,很便宜。

只是事情是有两面性的,socket.io因为它的完美也带动了坑的地方,最首要的就是臃肿,它的卷入也给多少牵动了较多的简报冗余,而且优雅降级这一独到之处,也伴随浏览器标准化的展开逐步失去了宏伟

Chrome Supported in version 4+
Firefox Supported in version 4+
Internet Explorer Supported in version 10+
Opera Supported in version 10+
Safari Supported in version 5+

在此地不是指责说socket.io不佳,已经被淘汰了,而是有时候我们也得以考虑部分别样的贯彻~

 

2、http模块

恰巧说了socket.io臃肿,那现在就来说说便捷的,首先demo

JavaScript

var http = require(‘http’); var server = http.createServer();
server.on(‘upgrade’, function(req) { console.log(req.headers); });
server.listen(8888);

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var http = require(‘http’);
var server = http.createServer();
server.on(‘upgrade’, function(req) {
console.log(req.headers);
});
server.listen(8888);

很简单的兑现,其实socket.io内部对websocket也是如此完结的,可是前边帮大家封装了一些handle处理,那里我们也可以协调去充分,给出两张socket.io中的源码图

必发88 1

必发88 2

 

3、ws模块

末尾有个例证会用到,那里就提一下,后边具体看~

 

二、自己达成一套server端websocket

碰巧说了三种常见的websocket完成格局,现在大家思考,对于开发者来说

websocket相对于传统http数据交互格局以来,伸张了服务器推送的轩然大波,客户端接收到事件再拓展对应处理,开发起来差别并不是太大啊

那是因为这个模块已经帮我们将数码帧解析必发88 ,此间的坑都填好了,第二片段大家将尝试自己制作一套简便的服务器端websocket模块

谢谢次碳酸钴的商量支持,本身在那里那有的只是不难说下,即使对此有趣味好奇的请百度【web技术切磋所】

祥和已毕服务器端websocket主要有两点,一个是利用net模块接受数据流,还有一个是对待官方的帧结构图解析数据,完结那两局部就早已成功了上上下下的平底工作

率先给一个客户端发送websocket握手报文的抓包内容

客户端代码很简短

JavaScript

ws = new WebSocket(“ws://127.0.0.1:8888”);

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ws = new WebSocket("ws://127.0.0.1:8888");

必发88 3

服务器端要对准那么些key验证,就是讲key加上一个一定的字符串后做一次sha1运算,将其结果转换为base64送重返

JavaScript

var crypto = require(‘crypto’); var WS =
‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
require(‘net’).createServer(function(o) { var key;
o.on(‘data’,function(e) { if(!key) { // 获取发送过来的KEY key =
e.toString().match(/Sec-WebSocket-Key: (.+)/)[1]; //
连接上WS这么些字符串,并做五遍sha1运算,最终转换成Base64 key =
crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’); //
输出再次来到给客户端的多少,那些字段都是必须的 o.write(‘HTTP/1.1 101
Switching Protocols\r\n’); o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’); // 那么些字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’); //
输出空行,使HTTP头甘休 o.write(‘\r\n’); } }); }).listen(8888);

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var crypto = require(‘crypto’);
var WS = ‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
 
require(‘net’).createServer(function(o) {
var key;
o.on(‘data’,function(e) {
if(!key) {
// 获取发送过来的KEY
key = e.toString().match(/Sec-WebSocket-Key: (.+)/)[1];
// 连接上WS这个字符串,并做一次sha1运算,最后转换成Base64
key = crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’);
// 输出返回给客户端的数据,这些字段都是必须的
o.write(‘HTTP/1.1 101 Switching Protocols\r\n’);
o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’);
// 这个字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’);
// 输出空行,使HTTP头结束
o.write(‘\r\n’);
}
});
}).listen(8888);

如此那般握手部分就已经到位了,后边就是多少帧解析与转变的活了

先看下官方提供的帧结构示意图

必发88 4

概括介绍下

FIN为是或不是甘休的标记

RSV为预留空间,0

opcode标识数据类型,是不是分片,是还是不是二进制解析,心跳包等等

交由一张opcode对应图

必发88 5

MASK是或不是使用掩码

Payload len和后边extend payload length表示数据长度,这么些是最费力的

PayloadLen只有7位,换成无符号整型的话只有0到127的取值,这么小的数值当然不可能描述较大的数额,由此规定当数码长度小于或等于125时候它才作为数据长度的描述,如若那几个值为126,则时候背后的三个字节来囤积数据长度,假若为127则用前边三个字节来存储数据长度

Masking-key掩码

上边贴出解析数据帧的代码

JavaScript

function decodeDataFrame(e) { var i = 0, j,s, frame = { FIN: e[i]
>> 7, Opcode: e[i++] & 15, Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F }; if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++]; }
if(frame.PayloadLength === 127) { i += 4; frame.PayloadLength =
(e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8)

  • e[i++]; } if(frame.Mask) { frame.MaskingKey = [e[i++], e[i++],
    e[i++], e[i++]]; for(j = 0, s = []; j < frame.PayloadLength;
    j++) { s.push(e[i+j] ^ frame.MaskingKey[j%4]); } } else { s =
    e.slice(i, i+frame.PayloadLength); } s = new Buffer(s); if(frame.Opcode
    === 1) { s = s.toString(); } frame.PayloadData = s; return frame; }
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function decodeDataFrame(e) {
var i = 0,
j,s,
frame = {
FIN: e[i] >> 7,
Opcode: e[i++] & 15,
Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F
};
 
if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++];
}
 
if(frame.PayloadLength === 127) {
i += 4;
frame.PayloadLength = (e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8) + e[i++];
}
 
if(frame.Mask) {
frame.MaskingKey = [e[i++], e[i++], e[i++], e[i++]];
 
for(j = 0, s = []; j < frame.PayloadLength; j++) {
s.push(e[i+j] ^ frame.MaskingKey[j%4]);
}
} else {
s = e.slice(i, i+frame.PayloadLength);
}
 
s = new Buffer(s);
 
if(frame.Opcode === 1) {
s = s.toString();
}
 
frame.PayloadData = s;
return frame;
}

websocket探索其与语音,图片的力量。然后是转变数据帧的

JavaScript

websocket探索其与语音,图片的力量。function encodeDataFrame(e) { var s = [], o = new
Buffer(e.PayloadData), l = o.length; s.push((e.FIN << 7) +
e.Opcode); if(l < 126) { s.push(l); } else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0,
0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), o]); }

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function encodeDataFrame(e) {
var s = [],
o = new Buffer(e.PayloadData),
l = o.length;
 
s.push((e.FIN << 7) + e.Opcode);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), o]);
}

都是按照帧结构示意图上的去处理,在此处不细讲,著作主要在下有些,倘使对那块感兴趣的话可以活动web技术探讨所~

 

三、websocket传输图片和websocket语音聊天室

正片环节到了,那篇小说最首要的要么展现一下websocket的部分使用情形

1、传输图片

大家先商量传输图片的步子是什么,首先服务器收到到客户端请求,然后读取图片文件,将二进制数据转载给客户端,客户端怎样处理?当然是使用FileReader对象了

先给客户端代码

JavaScript

var ws = new WebSocket(“ws://xxx.xxx.xxx.xxx:8888”); ws.onopen =
function(){ console.log(“握手成功”); }; ws.onmessage = function(e) { var
reader = new FileReader(); reader.onload = function(event) { var
contents = event.target.result; var a = new Image(); a.src = contents;
document.body.appendChild(a); } reader.readAsDataURL(e.data); };

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var ws = new WebSocket("ws://xxx.xxx.xxx.xxx:8888");
 
ws.onopen = function(){
    console.log("握手成功");
};
 
ws.onmessage = function(e) {
    var reader = new FileReader();
    reader.onload = function(event) {
        var contents = event.target.result;
        var a = new Image();
        a.src = contents;
        document.body.appendChild(a);
    }
    reader.readAsDataURL(e.data);
};

收纳到音信,然后readAsDataURL,直接将图纸base64添加到页面中

转到服务器端代码

JavaScript

fs.readdir(“skyland”, function(err, files) { if(err) { throw err; }
for(var i = 0; i < files.length; i++) { fs.readFile(‘skyland/’ +
files[i], function(err, data) { if(err) { throw err; }
o.write(encodeImgFrame(data)); }); } }); function encodeImgFrame(buf) {
var s = [], l = buf.length, ret = []; s.push((1 << 7) + 2);
if(l < 126) { s.push(l); } else if(l < 0x10000) { s.push(126,
(l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0, 0, 0,
(l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), buf]); }

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fs.readdir("skyland", function(err, files) {
if(err) {
throw err;
}
for(var i = 0; i < files.length; i++) {
fs.readFile(‘skyland/’ + files[i], function(err, data) {
if(err) {
throw err;
}
 
o.write(encodeImgFrame(data));
});
}
});
 
function encodeImgFrame(buf) {
var s = [],
l = buf.length,
ret = [];
 
s.push((1 << 7) + 2);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), buf]);
}

注意s.push((1 << 7) +
2)
这一句,那里相当直接把opcode写死了为2,对于Binary
Frame,那样客户端接收到多少是不会尝试举行toString的,否则会报错~

代码很粗略,在此处向我们享受一下websocket传输图片的快慢怎样

测试很多张图纸,总共8.24M

平常静态资源服务器需求20s左右(服务器较远)

cdn需要2.8s左右

那大家的websocket格局吧??!

答案是一致必要20s左右,是或不是很失望……速度就是慢在传输上,并不是服务器读取图片,本机上等同的图形资源,1s左右得以成功……那样看来数据流也不知所厝冲破距离的限量提升传输速度

上边我们来看望websocket的另一个用法~

 

用websocket搭建语音聊天室

先来整理一下语音聊天室的效果

用户进入频道随后从迈克风输入音频,然后发送给后台转载给频道里面的其余人,其余人接收到音信举办播放

看起来困难在七个地点,第三个是音频的输入,第二是收纳到多少流举办播报

先说音频的输入,那里运用了HTML5的getUserMedia方法,但是注意了,那些方法上线是有大坑的,最终说,先贴代码

JavaScript

if (navigator.getUserMedia) { navigator.getUserMedia( { audio: true },
function (stream) { var rec = new SRecorder(stream); recorder = rec; })
}

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if (navigator.getUserMedia) {
    navigator.getUserMedia(
        { audio: true },
        function (stream) {
            var rec = new SRecorder(stream);
            recorder = rec;
        })
}

首先个参数是{audio:
true},只启用音频,然后创立了一个SRecorder对象,后续的操作基本上都在那么些目的上进行。此时一经代码运行在该地的话浏览器应该升迁您是或不是启用Mike风输入,确定之后就开动了

接下去大家看下SRecorder构造函数是甚,给出紧要的部分

JavaScript

var SRecorder = function(stream) { …… var context = new AudioContext();
var audioInput = context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); …… }

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var SRecorder = function(stream) {
    ……
   var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
    ……
}

奥迪(Audi)oContext是一个节奏上下文对象,有做过声音过滤处理的同窗应该明了“一段音频到达扬声器举办播放此前,半路对其展开拦截,于是大家就赢得了拍子数据了,那几个拦截工作是由window.奥迪(Audi)oContext来做的,大家富有对旋律的操作都按照那么些目的”,大家得以由此奥迪oContext创立不一样的奥迪(Audi)oNode节点,然后添加滤镜播放特其他声息

录音原理一样,大家也急需走奥迪(Audi)oContext,可是多了一步对Mike风音频输入的吸纳上,而不是像往常处理音频一下用ajax请求音频的ArrayBuffer对象再decode,迈克风的承受须求用到createMediaStreamSource方法,注意那些参数就是getUserMedia方法第三个参数的参数

再者说createScriptProcessor方法,它官方的诠释是:

Creates a ScriptProcessorNode, which can be used for direct audio
processing via JavaScript.

——————

包涵下就是其一主意是利用JavaScript去处理音频采集操作

好不简单到点子采集了!胜利就在眼前!

接下去让我们把迈克风的输入和音频采集相连起来

JavaScript

audioInput.connect(recorder); recorder.connect(context.destination);

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audioInput.connect(recorder);
recorder.connect(context.destination);

context.destination官方解释如下

The destination property of
the AudioContext interface
returns
an AudioDestinationNoderepresenting
the final destination of all audio in the context.

——————

context.destination重回代表在环境中的音频的终极目标地。

好,到了此时,大家还亟需一个监听音频采集的事件

JavaScript

recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); }

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recorder.onaudioprocess = function (e) {
    audioData.input(e.inputBuffer.getChannelData(0));
}

audioData是一个目的,这一个是在网上找的,我就加了一个clear方法因为背后会用到,紧要有不行encodeWAV方法很赞,别人进行了频仍的节拍压缩和优化,这一个最后会伴随完整的代码一起贴出来

那儿总体用户进入频道随后从Mike风输入音频环节就早已做到啦,上边就该是向劳动器端发送音频流,稍微有点蛋疼的来了,刚才我们说了,websocket通过opcode不相同可以代表回去的数目是文件照旧二进制数据,而我辈onaudioprocess中input进去的是数组,最终播放声音须求的是Blob,{type:
‘audio/wav’}的靶子,那样大家就亟须要在殡葬往日将数组转换成WAV的Blob,此时就用到了地点说的encodeWAV方法

服务器就像很简短,只要转载就行了

本土测试确实可以,唯独天坑来了!将顺序跑在服务器上时候调用getUserMedia方法提醒我不可能不在一个安全的环境,也就是亟需https,那代表ws也不可能不换成wss……据此服务器代码就从未有过利用大家协调包装的抓手、解析和编码了,代码如下

JavaScript

var https = require(‘https’); var fs = require(‘fs’); var ws =
require(‘ws’); var userMap = Object.create(null); var options = { key:
fs.readFileSync(‘./privatekey.pem’), cert:
fs.readFileSync(‘./certificate.pem’) }; var server =
https.createServer(options, function(req, res) { res.writeHead({
‘Content-Type’ : ‘text/html’ }); fs.readFile(‘./testaudio.html’,
function(err, data) { if(err) { return ; } res.end(data); }); }); var
wss = new ws.Server({server: server}); wss.on(‘connection’, function(o)
{ o.on(‘message’, function(message) { if(message.indexOf(‘user’) === 0)
{ var user = message.split(‘:’)[1]; userMap[user] = o; } else {
for(var u in userMap) { userMap[u].send(message); } } }); });
server.listen(8888);

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var https = require(‘https’);
var fs = require(‘fs’);
var ws = require(‘ws’);
var userMap = Object.create(null);
var options = {
    key: fs.readFileSync(‘./privatekey.pem’),
    cert: fs.readFileSync(‘./certificate.pem’)
};
var server = https.createServer(options, function(req, res) {
    res.writeHead({
        ‘Content-Type’ : ‘text/html’
    });
 
    fs.readFile(‘./testaudio.html’, function(err, data) {
        if(err) {
            return ;
        }
 
        res.end(data);
    });
});
 
var wss = new ws.Server({server: server});
 
wss.on(‘connection’, function(o) {
    o.on(‘message’, function(message) {
if(message.indexOf(‘user’) === 0) {
    var user = message.split(‘:’)[1];
    userMap[user] = o;
} else {
    for(var u in userMap) {
userMap[u].send(message);
    }
}
    });
});
 
server.listen(8888);

代码依旧很粗略的,使用https模块,然后用了启幕说的ws模块,userMap是模拟的频道,只兑现转发的骨干职能

选择ws模块是因为它极度https完毕wss实在是太便宜了,和逻辑代码0争论

https的搭建在这里就不提了,首若是需求私钥、CSR证书签名和注明文件,感兴趣的同窗可以精通下(但是不打听的话在现网环境也用持续getUserMedia……)

上面是共同体的前端代码

JavaScript

var a = document.getElementById(‘a’); var b =
document.getElementById(‘b’); var c = document.getElementById(‘c’);
navigator.getUserMedia = navigator.getUserMedia ||
navigator.webkitGetUserMedia; var gRecorder = null; var audio =
document.querySelector(‘audio’); var door = false; var ws = null;
b.onclick = function() { if(a.value === ”) { alert(‘请输入用户名’);
return false; } if(!navigator.getUserMedia) {
alert(‘抱歉您的设施无波兰语音聊天’); return false; }
SRecorder.get(function (rec) { gRecorder = rec; }); ws = new
WebSocket(“wss://x.x.x.x:8888”); ws.onopen = function() {
console.log(‘握手成功’); ws.send(‘user:’ + a.value); }; ws.onmessage =
function(e) { receive(e.data); }; document.onkeydown = function(e) {
if(e.keyCode === 65) { if(!door) { gRecorder.start(); door = true; } }
}; document.onkeyup = function(e) { if(e.keyCode === 65) { if(door) {
ws.send(gRecorder.getBlob()); gRecorder.clear(); gRecorder.stop(); door
= false; } } } } c.onclick = function() { if(ws) { ws.close(); } } var
SRecorder = function(stream) { config = {}; config.sampleBits =
config.smapleBits || 8; config.sampleRate = config.sampleRate || (44100
/ 6); var context = new 奥迪oContext(); var audioInput =
context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); var audioData = { size: 0
//录音文件长度 , buffer: [] //录音缓存 , inputSampleRate:
context.sampleRate //输入采样率 , inputSampleBits: 16 //输入采样数位 8,
16 , outputSampleRate: config.sampleRate //输出采样率 , outut萨姆pleBits:
config.sampleBits //输出采样数位 8, 16 , clear: function() { this.buffer
= []; this.size = 0; } , input: function (data) { this.buffer.push(new
Float32Array(data)); this.size += data.length; } , compress: function ()
{ //合并压缩 //合并 var data = new Float32Array(this.size); var offset =
0; for (var i = 0; i < this.buffer.length; i++) {
data.set(this.buffer[i], offset); offset += this.buffer[i].length; }
//压缩 var compression = parseInt(this.inputSampleRate /
this.outputSampleRate); var length = data.length / compression; var
result = new Float32Array(length); var index = 0, j = 0; while (index
< length) { result[index] = data[j]; j += compression; index++; }
return result; } , encodeWAV: function () { var sampleRate =
Math.min(this.inputSampleRate, this.outputSampleRate); var sampleBits =
Math.min(this.inputSampleBits, this.oututSampleBits); var bytes =
this.compress(); var dataLength = bytes.length * (sampleBits / 8); var
buffer = new ArrayBuffer(44 + dataLength); var data = new
DataView(buffer); var channelCount = 1;//单声道 var offset = 0; var
writeString = function (str) { for (var i = 0; i < str.length; i++) {
data.setUint8(offset + i, str.charCodeAt(i)); } }; // 资源交流文件标识符
writeString(‘RIFF’); offset += 4; //
下个地方早先到文件尾总字节数,即文件大小-8 data.setUint32(offset, 36 +
dataLength, true); offset += 4; // WAV文件声明 writeString(‘WAVE’);
offset += 4; // 波形格式标志 writeString(‘fmt ‘); offset += 4; //
过滤字节,一般为 0x10 = 16 data.setUint32(offset, 16, true); offset += 4;
// 格式种类 (PCM方式采样数据) data.setUint16(offset, 1, true); offset +=
2; // 通道数 data.setUint16(offset, channelCount, true); offset += 2; //
采样率,每秒样本数,表示每个通道的播音速度 data.setUint32(offset,
sampleRate, true); offset += 4; // 波形数据传输率 (每秒平均字节数)
单声道×每秒数据位数×每样本数据位/8 data.setUint32(offset, channelCount
* sampleRate * (sampleBits / 8), true); offset += 4; // 快数据调整数
采样五遍占用字节数 单声道×每样本的数量位数/8 data.setUint16(offset,
channelCount * (sampleBits / 8), true); offset += 2; // 每样本数量位数
data.setUint16(offset, sampleBits, true); offset += 2; // 数据标识符
writeString(‘data’); offset += 4; // 采样数据总数,即数据总大小-44
data.setUint32(offset, dataLength, true); offset += 4; // 写入采样数据
if (sampleBits === 8) { for (var i = 0; i < bytes.length; i++,
offset++) { var s = Math.max(-1, Math.min(1, bytes[i])); var val = s
< 0 ? s * 0x8000 : s * 0x7FFF; val = parseInt(255 / (65535 / (val +
32768))); data.setInt8(offset, val, true); } } else { for (var i = 0; i
< bytes.length; i++, offset += 2) { var s = Math.max(-1, Math.min(1,
bytes[i])); data.setInt16(offset, s < 0 ? s * 0x8000 : s *
0x7FFF, true); } } return new Blob([data], { type: ‘audio/wav’ }); }
}; this.start = function () { audioInput.connect(recorder);
recorder.connect(context.destination); } this.stop = function () {
recorder.disconnect(); } this.getBlob = function () { return
audioData.encodeWAV(); } this.clear = function() { audioData.clear(); }
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); } }; SRecorder.get =
function (callback) { if (callback) { if (navigator.getUserMedia) {
navigator.getUserMedia( { audio: true }, function (stream) { var rec =
new SRecorder(stream); callback(rec); }) } } } function receive(e) {
audio.src = window.URL.createObjectURL(e); }

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var a = document.getElementById(‘a’);
var b = document.getElementById(‘b’);
var c = document.getElementById(‘c’);
 
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia;
 
var gRecorder = null;
var audio = document.querySelector(‘audio’);
var door = false;
var ws = null;
 
b.onclick = function() {
    if(a.value === ”) {
        alert(‘请输入用户名’);
        return false;
    }
    if(!navigator.getUserMedia) {
        alert(‘抱歉您的设备无法语音聊天’);
        return false;
    }
 
    SRecorder.get(function (rec) {
        gRecorder = rec;
    });
 
    ws = new WebSocket("wss://x.x.x.x:8888");
 
    ws.onopen = function() {
        console.log(‘握手成功’);
        ws.send(‘user:’ + a.value);
    };
 
    ws.onmessage = function(e) {
        receive(e.data);
    };
 
    document.onkeydown = function(e) {
        if(e.keyCode === 65) {
            if(!door) {
                gRecorder.start();
                door = true;
            }
        }
    };
 
    document.onkeyup = function(e) {
        if(e.keyCode === 65) {
            if(door) {
                ws.send(gRecorder.getBlob());
                gRecorder.clear();
                gRecorder.stop();
                door = false;
            }
        }
    }
}
 
c.onclick = function() {
    if(ws) {
        ws.close();
    }
}
 
var SRecorder = function(stream) {
    config = {};
 
    config.sampleBits = config.smapleBits || 8;
    config.sampleRate = config.sampleRate || (44100 / 6);
 
    var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
 
    var audioData = {
        size: 0          //录音文件长度
        , buffer: []     //录音缓存
        , inputSampleRate: context.sampleRate    //输入采样率
        , inputSampleBits: 16       //输入采样数位 8, 16
        , outputSampleRate: config.sampleRate    //输出采样率
        , oututSampleBits: config.sampleBits       //输出采样数位 8, 16
        , clear: function() {
            this.buffer = [];
            this.size = 0;
        }
        , input: function (data) {
            this.buffer.push(new Float32Array(data));
            this.size += data.length;
        }
        , compress: function () { //合并压缩
            //合并
            var data = new Float32Array(this.size);
            var offset = 0;
            for (var i = 0; i < this.buffer.length; i++) {
                data.set(this.buffer[i], offset);
                offset += this.buffer[i].length;
            }
            //压缩
            var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
            var length = data.length / compression;
            var result = new Float32Array(length);
            var index = 0, j = 0;
            while (index < length) {
                result[index] = data[j];
                j += compression;
                index++;
            }
            return result;
        }
        , encodeWAV: function () {
            var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
            var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
            var bytes = this.compress();
            var dataLength = bytes.length * (sampleBits / 8);
            var buffer = new ArrayBuffer(44 + dataLength);
            var data = new DataView(buffer);
 
            var channelCount = 1;//单声道
            var offset = 0;
 
            var writeString = function (str) {
                for (var i = 0; i < str.length; i++) {
                    data.setUint8(offset + i, str.charCodeAt(i));
                }
            };
 
            // 资源交换文件标识符
            writeString(‘RIFF’); offset += 4;
            // 下个地址开始到文件尾总字节数,即文件大小-8
            data.setUint32(offset, 36 + dataLength, true); offset += 4;
            // WAV文件标志
            writeString(‘WAVE’); offset += 4;
            // 波形格式标志
            writeString(‘fmt ‘); offset += 4;
            // 过滤字节,一般为 0x10 = 16
            data.setUint32(offset, 16, true); offset += 4;
            // 格式类别 (PCM形式采样数据)
            data.setUint16(offset, 1, true); offset += 2;
            // 通道数
            data.setUint16(offset, channelCount, true); offset += 2;
            // 采样率,每秒样本数,表示每个通道的播放速度
            data.setUint32(offset, sampleRate, true); offset += 4;
            // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
            data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
            // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
            data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
            // 每样本数据位数
            data.setUint16(offset, sampleBits, true); offset += 2;
            // 数据标识符
            writeString(‘data’); offset += 4;
            // 采样数据总数,即数据总大小-44
            data.setUint32(offset, dataLength, true); offset += 4;
            // 写入采样数据
            if (sampleBits === 8) {
                for (var i = 0; i < bytes.length; i++, offset++) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
                    val = parseInt(255 / (65535 / (val + 32768)));
                    data.setInt8(offset, val, true);
                }
            } else {
                for (var i = 0; i < bytes.length; i++, offset += 2) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
                }
            }
 
            return new Blob([data], { type: ‘audio/wav’ });
        }
    };
 
    this.start = function () {
        audioInput.connect(recorder);
        recorder.connect(context.destination);
    }
 
    this.stop = function () {
        recorder.disconnect();
    }
 
    this.getBlob = function () {
        return audioData.encodeWAV();
    }
 
    this.clear = function() {
        audioData.clear();
    }
 
    recorder.onaudioprocess = function (e) {
        audioData.input(e.inputBuffer.getChannelData(0));
    }
};
 
SRecorder.get = function (callback) {
    if (callback) {
        if (navigator.getUserMedia) {
            navigator.getUserMedia(
                { audio: true },
                function (stream) {
                    var rec = new SRecorder(stream);
                    callback(rec);
                })
        }
    }
}
 
function receive(e) {
    audio.src = window.URL.createObjectURL(e);
}

注意:按住a键说话,放开a键发送

投机有尝试不按键实时对讲,通过setInterval发送,但发现杂音有点重,效果不佳,那几个须求encodeWAV再一层的包装,多去除环境杂音的效果,自己接纳了尤其便民的按键说话的格局

 

那篇作品里首先展望了websocket的前程,然后根据专业大家协调尝尝解析和变化数据帧,对websocket有了更深一步的询问

说到底通过多个demo看到了websocket的潜力,关于语音聊天室的demo涉及的较广,没有接触过奥迪oContext对象的同窗最好先领会下奥迪(Audi)oContext

小说到这边就为止啦~有啥想法和题材欢迎我们提议来一起座谈探索~

 

1 赞 11 收藏 3
评论

必发88 6

初稿出处:
AlloyTeam   

原稿出处:
AlloyTeam   

初稿出处:
AlloyTeam   

说到websocket想比大家不会陌生,如果陌生的话也没提到,一句话概括

说到websocket想比大家不会陌生,即使陌生的话也没涉及,一句话概括

说到websocket想比大家不会陌生,如若陌生的话也没涉及,一句话概括

“WebSocket protocol
是HTML5一种新的协议。它达成了浏览器与服务器全双工通讯”

“WebSocket protocol
是HTML5一种新的情商。它完结了浏览器与服务器全双工通讯”

“WebSocket protocol
是HTML5一种新的磋商。它完成了浏览器与服务器全双工通讯”

WebSocket相比较传统那个服务器推技术大致好了太多,大家可以挥手向comet和长轮询那些技巧说拜拜啦,庆幸我们生活在富有HTML5的时代~

WebSocket相相比较传统那个服务器推技术几乎好了太多,我们得以挥手向comet和长轮询这几个技术说拜拜啦,庆幸我们生活在具备HTML5的一世~

WebSocket相比较传统那多少个服务器推技术简直好了太多,大家可以挥手向comet和长轮询那些技巧说拜拜啦,庆幸我们生活在享有HTML5的时代~

那篇文章大家将分三有的探索websocket

那篇文章我们将分三片段探索websocket

那篇作品我们将分三有些探索websocket

率先是websocket的大规模使用,其次是完全自己创立服务器端websocket,最终是最紧要介绍利用websocket制作的四个demo,传输图片和在线语音聊天室,let’s
go

首先是websocket的普遍使用,其次是截然自己制作服务器端websocket,最后是首要介绍利用websocket制作的三个demo,传输图片和在线语音聊天室,let’s
go

先是是websocket的广阔使用,其次是一心自己创设服务器端websocket,最后是非同儿戏介绍利用websocket制作的七个demo,传输图片和在线语音聊天室,let’s
go

一、websocket常见用法

一、websocket常见用法

一、websocket常见用法

此间介绍二种自己觉得大规模的websocket完毕……(留神:本文建立在node上下文环境

此间介绍三种自己觉着大规模的websocket已毕……(注意:本文建立在node上下文环境

此地介绍二种自我觉着大规模的websocket落成……(瞩目:本文建立在node上下文环境

1、socket.io

1、socket.io

1、socket.io

先给demo

先给demo

先给demo

JavaScript

JavaScript

JavaScript

var http = require(‘http’); var io = require(‘socket.io’); var server =
http.createServer(function(req, res) { res.writeHeader(200,
{‘content-type’: ‘text/html;charset=”utf-8″‘}); res.end();
}).listen(8888); var socket =.io.listen(server);
socket.sockets.on(‘connection’, function(socket) { socket.emit(‘xxx’,
{options}); socket.on(‘xxx’, function(data) { // do someting }); });

var http = require(‘http’); var io = require(‘socket.io’); var server =
http.createServer(function(req, res) { res.writeHeader(200,
{‘content-type’: ‘text/html;charset=”utf-8″‘}); res.end();
}).listen(8888); var socket =.io.listen(server);
socket.sockets.on(‘connection’, function(socket) { socket.emit(‘xxx’,
{options}); socket.on(‘xxx’, function(data) { // do someting }); });

var http = require(‘http’); var io = require(‘socket.io’); var server =
http.createServer(function(req, res) { res.writeHeader(200,
{‘content-type’: ‘text/html;charset=”utf-8″‘}); res.end();
}).listen(8888); var socket =.io.listen(server);
socket.sockets.on(‘connection’, function(socket) { socket.emit(‘xxx’,
{options}); socket.on(‘xxx’, function(data) { // do someting }); });

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var http = require(‘http’);
var io = require(‘socket.io’);
 
var server = http.createServer(function(req, res) {
    res.writeHeader(200, {‘content-type’: ‘text/html;charset="utf-8"’});
    res.end();
}).listen(8888);
 
var socket =.io.listen(server);
 
socket.sockets.on(‘connection’, function(socket) {
    socket.emit(‘xxx’, {options});
 
    socket.on(‘xxx’, function(data) {
        // do someting
    });
});
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var http = require(‘http’);
var io = require(‘socket.io’);
 
var server = http.createServer(function(req, res) {
    res.writeHeader(200, {‘content-type’: ‘text/html;charset="utf-8"’});
    res.end();
}).listen(8888);
 
var socket =.io.listen(server);
 
socket.sockets.on(‘connection’, function(socket) {
    socket.emit(‘xxx’, {options});
 
    socket.on(‘xxx’, function(data) {
        // do someting
    });
});
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var http = require(‘http’);
var io = require(‘socket.io’);
 
var server = http.createServer(function(req, res) {
    res.writeHeader(200, {‘content-type’: ‘text/html;charset="utf-8"’});
    res.end();
}).listen(8888);
 
var socket =.io.listen(server);
 
socket.sockets.on(‘connection’, function(socket) {
    socket.emit(‘xxx’, {options});
 
    socket.on(‘xxx’, function(data) {
        // do someting
    });
});

深信不疑精晓websocket的同校不可以不精通socket.io,因为socket.io太盛名了,也很棒,它自己对过期、握手等都做了处理。我估算那也是落到实处websocket使用最多的方式。socket.io最最最良好的某些就是优雅降级,当浏览器不支持websocket时,它会在里边优雅降级为长轮询等,用户和开发者是不要求关爱具体落到实处的,很有利。

深信精通websocket的同校不容许不精通socket.io,因为socket.io太盛名了,也很棒,它自身对过期、握手等都做了拍卖。我猜忌那也是贯彻websocket使用最多的法子。socket.io最最最卓越的少数就是优雅降级,当浏览器不支持websocket时,它会在里头优雅降级为长轮询等,用户和开发者是不须要关心具体贯彻的,很有益。

相信明白websocket的同桌不容许不精通socket.io,因为socket.io太盛名了,也很棒,它自己对逾期、握手等都做了拍卖。我猜度那也是达成websocket使用最多的主意。socket.io最最最理想的一点就是优雅降级,当浏览器不援救websocket时,它会在里头优雅降级为长轮询等,用户和开发者是不须求关爱具体落到实处的,很方便。

不过事情是有两面性的,socket.io因为它的健全也带来了坑的地点,最重大的就是臃肿,它的包装也给多少拉动了较多的广播公布冗余,而且优雅降级这一亮点,也陪同浏览器标准化的拓展逐步失去了宏伟

然则事情是有两面性的,socket.io因为它的无微不至也牵动了坑的地点,最重点的就是臃肿,它的包装也给多少牵动了较多的简报冗余,而且优雅降级这一亮点,也伴随浏览器标准化的展开逐级失去了宏伟

可是工作是有两面性的,socket.io因为它的完美也牵动了坑的地方,最关键的就是臃肿,它的包装也给多少拉动了较多的报道冗余,而且优雅降级这一优点,也陪伴浏览器标准化的开展逐级失去了巨大

Chrome Supported in version 4+
Firefox Supported in version 4+
Internet Explorer Supported in version 10+
Opera Supported in version 10+
Safari Supported in version 5+
Chrome Supported in version 4+
Firefox Supported in version 4+
Internet Explorer Supported in version 10+
Opera Supported in version 10+
Safari Supported in version 5+
Chrome Supported in version 4+
Firefox Supported in version 4+
Internet Explorer Supported in version 10+
Opera Supported in version 10+
Safari Supported in version 5+

在那边不是指责说socket.io不好,已经被淘汰了,而是有时候大家也足以设想部分别样的贯彻~

在那里不是指责说socket.io倒霉,已经被淘汰了,而是有时候大家也得以设想部分任何的落到实处~

在那里不是指责说socket.io不佳,已经被淘汰了,而是有时候我们也可以考虑部分其余的达成~

 

 

 

2、http模块

2、http模块

2、http模块

刚巧说了socket.io臃肿,那现在就来说说便捷的,首先demo

正巧说了socket.io臃肿,那现在就来说说便捷的,首先demo

刚好说了socket.io臃肿,那现在就来说说便捷的,首先demo

JavaScript

JavaScript

JavaScript

var http = require(‘http’); var server = http.createServer();
server.on(‘upgrade’, function(req) { console.log(req.headers); });
server.listen(8888);

var http = require(‘http’); var server = http.createServer();
server.on(‘upgrade’, function(req) { console.log(req.headers); });
server.listen(8888);

var http = require(‘http’); var server = http.createServer();
server.on(‘upgrade’, function(req) { console.log(req.headers); });
server.listen(8888);

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var http = require(‘http’);
var server = http.createServer();
server.on(‘upgrade’, function(req) {
console.log(req.headers);
});
server.listen(8888);
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var http = require(‘http’);
var server = http.createServer();
server.on(‘upgrade’, function(req) {
console.log(req.headers);
});
server.listen(8888);
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var http = require(‘http’);
var server = http.createServer();
server.on(‘upgrade’, function(req) {
console.log(req.headers);
});
server.listen(8888);

很粗略的兑现,其实socket.io内部对websocket也是如此完毕的,不过前面帮大家封装了一部分handle处理,那里大家也得以协调去丰盛,给出两张socket.io中的源码图

很不难的完结,其实socket.io内部对websocket也是这么完成的,可是后边帮大家封装了部分handle处理,那里大家也可以自己去丰盛,给出两张socket.io中的源码图

很简短的落到实处,其实socket.io内部对websocket也是那样完结的,可是前面帮大家封装了有的handle处理,那里大家也得以团结去丰硕,给出两张socket.io中的源码图

必发88 7

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3、ws模块

3、ws模块

3、ws模块

背后有个例子会用到,那里就提一下,前边具体看~

前面有个例证会用到,那里就提一下,前边具体看~

前面有个例子会用到,那里就提一下,后边具体看~

 

 

 

二、自己达成一套server端websocket

二、自己达成一套server端websocket

二、自己落成一套server端websocket

刚刚说了三种常见的websocket完结情势,现在我们思考,对于开发者来说

刚巧说了两种普遍的websocket完毕方式,现在大家寻思,对于开发者来说

正巧说了三种普遍的websocket完毕格局,现在大家考虑,对于开发者来说

websocket相对于传统http数据交互格局以来,增加了服务器推送的轩然大波,客户端接收到事件再开展相应处理,开发起来不一致并不是太大呀

websocket相对于传统http数据交互形式以来,扩展了服务器推送的风云,客户端接收到事件再开展对应处理,开发起来不一致并不是太大啊

websocket相对于传统http数据交互情势以来,增加了服务器推送的事件,客户端接收到事件再开展对应处理,开发起来分歧并不是太大啊

那是因为这个模块已经帮大家将多少帧解析那边的坑都填好了,第二有的大家将尝试自己制作一套简便的服务器端websocket模块

那是因为那几个模块已经帮我们将数据帧解析那里的坑都填好了,第二有些大家将尝试自己创制一套简便的服务器端websocket模块

那是因为那么些模块已经帮大家将数据帧解析此间的坑都填好了,第二局地大家将尝试自己创设一套简便的服务器端websocket模块

谢谢次碳酸钴的切磋帮忙,本人在此处那部分只是不难说下,若是对此有趣味好奇的请百度【web技术研商所】

谢谢次碳酸钴的商讨援助,本人在那边那有的只是简单说下,倘若对此有趣味好奇的请百度【web技术切磋所】

感谢次碳酸钴的探究协理,自我在此地那有些只是简短说下,假若对此有趣味好奇的请百度【web技术琢磨所】

协调做到服务器端websocket主要有两点,一个是选拔net模块接受数据流,还有一个是相对而言官方的帧结构图解析数据,落成这两部分就曾经形成了任何的底层工作

和谐落成服务器端websocket首要有两点,一个是运用net模块接受数据流,还有一个是对待官方的帧结构图解析数据,达成那两局地就已经完结了整个的底层工作

祥和做到服务器端websocket主要有两点,一个是行使net模块接受数据流,还有一个是相比官方的帧结构图解析数据,完毕这两有些就早已成功了全方位的底层工作

首先给一个客户端发送websocket握手报文的抓包内容

第一给一个客户端发送websocket握手报文的抓包内容

率先给一个客户端发送websocket握手报文的抓包内容

客户端代码很粗略

客户端代码很简单

客户端代码很粗略

JavaScript

JavaScript

JavaScript

ws = new WebSocket(“ws://127.0.0.1:8888”);

ws = new WebSocket(“ws://127.0.0.1:8888”);

ws = new WebSocket(“ws://127.0.0.1:8888”);

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ws = new WebSocket("ws://127.0.0.1:8888");
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ws = new WebSocket("ws://127.0.0.1:8888");
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ws = new WebSocket("ws://127.0.0.1:8888");

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服务器端要指向这么些key验证,就是讲key加上一个一定的字符串后做四次sha1运算,将其结果转换为base64送再次来到

服务器端要指向那几个key验证,就是讲key加上一个一定的字符串后做两遍sha1运算,将其结果转换为base64送回去

服务器端要对准那个key验证,就是讲key加上一个一定的字符串后做一回sha1运算,将其结果转换为base64送重临

JavaScript

JavaScript

JavaScript

var crypto = require(‘crypto’); var WS =
‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
require(‘net’).createServer(function(o) { var key;
o.on(‘data’,function(e) { if(!key) { // 获取发送过来的KEY key =
e.toString().match(/Sec-WebSocket-Key: (.+)/)[1]; //
连接上WS那个字符串,并做四次sha1运算,最终转换成Base64 key =
crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’); //
输出再次来到给客户端的数目,那几个字段都是必须的 o.write(‘HTTP/1.1 101
Switching Protocols\r\n’); o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’); // 那个字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’); //
输出空行,使HTTP头甘休 o.write(‘\r\n’); } }); }).listen(8888);

var crypto = require(‘crypto’); var WS =
‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
require(‘net’).createServer(function(o) { var key;
o.on(‘data’,function(e) { if(!key) { // 获取发送过来的KEY key =
e.toString().match(/Sec-WebSocket-Key: (.+)/)[1]; //
连接上WS那几个字符串,并做三回sha1运算,最终转换成Base64 key =
crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’); //
输出重回给客户端的多寡,那么些字段都是必须的 o.write(‘HTTP/1.1 101
Switching Protocols\r\n’); o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’); // 那么些字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’); //
输出空行,使HTTP头停止 o.write(‘\r\n’); } }); }).listen(8888);

var crypto = require(‘crypto’); var WS =
‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
require(‘net’).createServer(function(o) { var key;
o.on(‘data’,function(e) { if(!key) { // 获取发送过来的KEY key =
e.toString().match(/Sec-WebSocket-Key: (.+)/)[1]; //
连接上WS这些字符串,并做三遍sha1运算,最后转换成Base64 key =
crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’); //
输出重临给客户端的数码,这几个字段都是必须的 o.write(‘HTTP/1.1 101
Switching Protocols\r\n’); o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’); // 那些字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’); //
输出空行,使HTTP头截至 o.write(‘\r\n’); } }); }).listen(8888);

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var crypto = require(‘crypto’);
var WS = ‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
 
require(‘net’).createServer(function(o) {
var key;
o.on(‘data’,function(e) {
if(!key) {
// 获取发送过来的KEY
key = e.toString().match(/Sec-WebSocket-Key: (.+)/)[1];
// 连接上WS这个字符串,并做一次sha1运算,最后转换成Base64
key = crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’);
// 输出返回给客户端的数据,这些字段都是必须的
o.write(‘HTTP/1.1 101 Switching Protocols\r\n’);
o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’);
// 这个字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’);
// 输出空行,使HTTP头结束
o.write(‘\r\n’);
}
});
}).listen(8888);
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var crypto = require(‘crypto’);
var WS = ‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
 
require(‘net’).createServer(function(o) {
var key;
o.on(‘data’,function(e) {
if(!key) {
// 获取发送过来的KEY
key = e.toString().match(/Sec-WebSocket-Key: (.+)/)[1];
// 连接上WS这个字符串,并做一次sha1运算,最后转换成Base64
key = crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’);
// 输出返回给客户端的数据,这些字段都是必须的
o.write(‘HTTP/1.1 101 Switching Protocols\r\n’);
o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’);
// 这个字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’);
// 输出空行,使HTTP头结束
o.write(‘\r\n’);
}
});
}).listen(8888);
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var crypto = require(‘crypto’);
var WS = ‘258EAFA5-E914-47DA-95CA-C5AB0DC85B11’;
 
require(‘net’).createServer(function(o) {
var key;
o.on(‘data’,function(e) {
if(!key) {
// 获取发送过来的KEY
key = e.toString().match(/Sec-WebSocket-Key: (.+)/)[1];
// 连接上WS这个字符串,并做一次sha1运算,最后转换成Base64
key = crypto.createHash(‘sha1’).update(key+WS).digest(‘base64’);
// 输出返回给客户端的数据,这些字段都是必须的
o.write(‘HTTP/1.1 101 Switching Protocols\r\n’);
o.write(‘Upgrade: websocket\r\n’);
o.write(‘Connection: Upgrade\r\n’);
// 这个字段带上服务器处理后的KEY
o.write(‘Sec-WebSocket-Accept: ‘+key+’\r\n’);
// 输出空行,使HTTP头结束
o.write(‘\r\n’);
}
});
}).listen(8888);

这么握手部分就早已成功了,前边就是数据帧解析与变化的活了

那般握手部分就已经完结了,前边就是数据帧解析与转变的活了

如此那般握手部分就已经形成了,前边就是多少帧解析与转变的活了

先看下官方提供的帧结构示意图

先看下官方提供的帧结构示意图

先看下官方提供的帧结构示意图

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简短介绍下

粗略介绍下

概括介绍下

FIN为是或不是终止的标记

FIN为是还是不是得了的标志

FIN为是不是得了的标示

RSV为留下空间,0

RSV为预留空间,0

RSV为留住空间,0

opcode标识数据类型,是或不是分片,是不是二进制解析,心跳包等等

opcode标识数据类型,是不是分片,是或不是二进制解析,心跳包等等

opcode标识数据类型,是或不是分片,是或不是二进制解析,心跳包等等

交由一张opcode对应图

提交一张opcode对应图

交给一张opcode对应图

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MASK是还是不是采取掩码

MASK是不是选择掩码

MASK是不是利用掩码

Payload len和前边extend payload length表示数据长度,那个是最费力的

Payload len和后边extend payload length表示数据长度,那么些是最麻烦的

Payload len和前面extend payload length表示数据长度,那个是最劳苦的

PayloadLen只有7位,换成无符号整型的话唯有0到127的取值,这么小的数值当然不能够描述较大的多寡,由此规定当数码长度小于或等于125时候它才作为数据长度的讲述,借使那些值为126,则时候背后的八个字节来存储数据长度,借使为127则用前面多个字节来储存数据长度

PayloadLen只有7位,换成无符号整型的话唯有0到127的取值,这么小的数值当然不能描述较大的多少,由此确定当数码长度小于或等于125时候它才作为数据长度的描述,如果这几个值为126,则时候背后的多少个字节来存储数据长度,假如为127则用前面三个字节来囤积数据长度

PayloadLen唯有7位,换成无符号整型的话唯有0到127的取值,这么小的数值当然无法描述较大的数额,由此确定当数码长度小于或等于125时候它才作为数据长度的叙述,要是这些值为126,则时候背后的五个字节来囤积数据长度,即使为127则用前边四个字节来存储数据长度

Masking-key掩码

Masking-key掩码

Masking-key掩码

下边贴出解析数据帧的代码

上边贴出解析数据帧的代码

下边贴出解析数据帧的代码

JavaScript

JavaScript

JavaScript

function decodeDataFrame(e) { var i = 0, j,s, frame = { FIN: e[i]
>> 7, Opcode: e[i++] & 15, Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F }; if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++]; }
if(frame.PayloadLength === 127) { i += 4; frame.PayloadLength =
(e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8)

function decodeDataFrame(e) { var i = 0, j,s, frame = { FIN: e[i]
>> 7, Opcode: e[i++] & 15, Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F }; if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++]; }
if(frame.PayloadLength === 127) { i += 4; frame.PayloadLength =
(e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8)

function decodeDataFrame(e) { var i = 0, j,s, frame = { FIN: e[i]
>> 7, Opcode: e[i++] & 15, Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F }; if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++]; }
if(frame.PayloadLength === 127) { i += 4; frame.PayloadLength =
(e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8)

  • e[i++]; } if(frame.Mask) { frame.MaskingKey = [e[i++], e[i++],
    e[i++], e[i++]]; for(j = 0, s = []; j < frame.PayloadLength;
    j++) { s.push(e[i+j] ^ frame.MaskingKey[j%4]); } } else { s =
    e.slice(i, i+frame.PayloadLength); } s = new Buffer(s); if(frame.Opcode
    === 1) { s = s.toString(); } frame.PayloadData = s; return frame; }
  • e[i++]; } if(frame.Mask) { frame.MaskingKey = [e[i++], e[i++],
    e[i++], e[i++]]; for(j = 0, s = []; j < frame.PayloadLength;
    j++) { s.push(e[i+j] ^ frame.MaskingKey[j%4]); } } else { s =
    e.slice(i, i+frame.PayloadLength); } s = new Buffer(s); if(frame.Opcode
    === 1) { s = s.toString(); } frame.PayloadData = s; return frame; }
  • e[i++]; } if(frame.Mask) { frame.MaskingKey = [e[i++], e[i++],
    e[i++], e[i++]]; for(j = 0, s = []; j < frame.PayloadLength;
    j++) { s.push(e[i+j] ^ frame.MaskingKey[j%4]); } } else { s =
    e.slice(i, i+frame.PayloadLength); } s = new Buffer(s); if(frame.Opcode
    === 1) { s = s.toString(); } frame.PayloadData = s; return frame; }
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function decodeDataFrame(e) {
var i = 0,
j,s,
frame = {
FIN: e[i] >> 7,
Opcode: e[i++] & 15,
Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F
};
 
if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++];
}
 
if(frame.PayloadLength === 127) {
i += 4;
frame.PayloadLength = (e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8) + e[i++];
}
 
if(frame.Mask) {
frame.MaskingKey = [e[i++], e[i++], e[i++], e[i++]];
 
for(j = 0, s = []; j < frame.PayloadLength; j++) {
s.push(e[i+j] ^ frame.MaskingKey[j%4]);
}
} else {
s = e.slice(i, i+frame.PayloadLength);
}
 
s = new Buffer(s);
 
if(frame.Opcode === 1) {
s = s.toString();
}
 
frame.PayloadData = s;
return frame;
}
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function decodeDataFrame(e) {
var i = 0,
j,s,
frame = {
FIN: e[i] >> 7,
Opcode: e[i++] & 15,
Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F
};
 
if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++];
}
 
if(frame.PayloadLength === 127) {
i += 4;
frame.PayloadLength = (e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8) + e[i++];
}
 
if(frame.Mask) {
frame.MaskingKey = [e[i++], e[i++], e[i++], e[i++]];
 
for(j = 0, s = []; j < frame.PayloadLength; j++) {
s.push(e[i+j] ^ frame.MaskingKey[j%4]);
}
} else {
s = e.slice(i, i+frame.PayloadLength);
}
 
s = new Buffer(s);
 
if(frame.Opcode === 1) {
s = s.toString();
}
 
frame.PayloadData = s;
return frame;
}
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function decodeDataFrame(e) {
var i = 0,
j,s,
frame = {
FIN: e[i] >> 7,
Opcode: e[i++] & 15,
Mask: e[i] >> 7,
PayloadLength: e[i++] & 0x7F
};
 
if(frame.PayloadLength === 126) {
frame.PayloadLength = (e[i++] << 8) + e[i++];
}
 
if(frame.PayloadLength === 127) {
i += 4;
frame.PayloadLength = (e[i++] << 24) + (e[i++] << 16) + (e[i++] << 8) + e[i++];
}
 
if(frame.Mask) {
frame.MaskingKey = [e[i++], e[i++], e[i++], e[i++]];
 
for(j = 0, s = []; j < frame.PayloadLength; j++) {
s.push(e[i+j] ^ frame.MaskingKey[j%4]);
}
} else {
s = e.slice(i, i+frame.PayloadLength);
}
 
s = new Buffer(s);
 
if(frame.Opcode === 1) {
s = s.toString();
}
 
frame.PayloadData = s;
return frame;
}

接下来是生成数据帧的

然后是转变数据帧的

接下来是浮动数据帧的

JavaScript

JavaScript

JavaScript

function encodeDataFrame(e) { var s = [], o = new
Buffer(e.PayloadData), l = o.length; s.push((e.FIN << 7) +
e.Opcode); if(l < 126) { s.push(l); } else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0,
0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), o]); }

function encodeDataFrame(e) { var s = [], o = new
Buffer(e.PayloadData), l = o.length; s.push((e.FIN << 7) +
e.Opcode); if(l < 126) { s.push(l); } else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0,
0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), o]); }

function encodeDataFrame(e) { var s = [], o = new
Buffer(e.PayloadData), l = o.length; s.push((e.FIN << 7) +
e.Opcode); if(l < 126) { s.push(l); } else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0,
0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), o]); }

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function encodeDataFrame(e) {
var s = [],
o = new Buffer(e.PayloadData),
l = o.length;
 
s.push((e.FIN << 7) + e.Opcode);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), o]);
}
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function encodeDataFrame(e) {
var s = [],
o = new Buffer(e.PayloadData),
l = o.length;
 
s.push((e.FIN << 7) + e.Opcode);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), o]);
}
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function encodeDataFrame(e) {
var s = [],
o = new Buffer(e.PayloadData),
l = o.length;
 
s.push((e.FIN << 7) + e.Opcode);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), o]);
}

都是比照帧结构示意图上的去处理,在那里不细讲,作品主要在下一些,要是对那块感兴趣的话可以运动web技术研商所~

都是比照帧结构示意图上的去处理,在那边不细讲,文章首要在下局地,若是对那块感兴趣的话可以活动web技术啄磨所~

都是比照帧结构示意图上的去处理,在此地不细讲,作品紧要在下部分,即使对那块感兴趣的话可以活动web技术啄磨所~

 

 

 

三、websocket传输图片和websocket语音聊天室

三、websocket传输图片和websocket语音聊天室

三、websocket传输图片和websocket语音聊天室

正片环节到了,这篇小说最重大的依然显示一下websocket的片段应用情形

正片环节到了,那篇小说最主要的要么展现一下websocket的部分行使情况

正片环节到了,那篇小说最重大的要么突显一下websocket的片段使用景况

1、传输图片

1、传输图片

1、传输图片

咱俩先切磋传输图片的步骤是什么样,首先服务器收到到客户端请求,然后读取图片文件,将二进制数据转载给客户端,客户端怎么样处理?当然是行使FileReader对象了

俺们先思考传输图片的手续是怎么样,首先服务器收到到客户端请求,然后读取图片文件,将二进制数据转载给客户端,客户端怎么着处理?当然是行使File里德r对象了

俺们先考虑传输图片的手续是什么,首先服务器收到到客户端请求,然后读取图片文件,将二进制数据转载给客户端,客户端如何处理?当然是选择FileReader对象了

先给客户端代码

先给客户端代码

先给客户端代码

JavaScript

JavaScript

JavaScript

var ws = new WebSocket(“ws://xxx.xxx.xxx.xxx:8888”); ws.onopen =
function(){ console.log(“握手成功”); }; ws.onmessage = function(e) { var
reader = new FileReader(); reader.onload = function(event) { var
contents = event.target.result; var a = new Image(); a.src = contents;
document.body.appendChild(a); } reader.readAsDataURL(e.data); };

var ws = new WebSocket(“ws://xxx.xxx.xxx.xxx:8888”); ws.onopen =
function(){ console.log(“握手成功”); }; ws.onmessage = function(e) { var
reader = new FileReader(); reader.onload = function(event) { var
contents = event.target.result; var a = new Image(); a.src = contents;
document.body.appendChild(a); } reader.readAsDataURL(e.data); };

var ws = new WebSocket(“ws://xxx.xxx.xxx.xxx:8888”); ws.onopen =
function(){ console.log(“握手成功”); }; ws.onmessage = function(e) { var
reader = new FileReader(); reader.onload = function(event) { var
contents = event.target.result; var a = new Image(); a.src = contents;
document.body.appendChild(a); } reader.readAsDataURL(e.data); };

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var ws = new WebSocket("ws://xxx.xxx.xxx.xxx:8888");
 
ws.onopen = function(){
    console.log("握手成功");
};
 
ws.onmessage = function(e) {
    var reader = new FileReader();
    reader.onload = function(event) {
        var contents = event.target.result;
        var a = new Image();
        a.src = contents;
        document.body.appendChild(a);
    }
    reader.readAsDataURL(e.data);
};
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var ws = new WebSocket("ws://xxx.xxx.xxx.xxx:8888");
 
ws.onopen = function(){
    console.log("握手成功");
};
 
ws.onmessage = function(e) {
    var reader = new FileReader();
    reader.onload = function(event) {
        var contents = event.target.result;
        var a = new Image();
        a.src = contents;
        document.body.appendChild(a);
    }
    reader.readAsDataURL(e.data);
};
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var ws = new WebSocket("ws://xxx.xxx.xxx.xxx:8888");
 
ws.onopen = function(){
    console.log("握手成功");
};
 
ws.onmessage = function(e) {
    var reader = new FileReader();
    reader.onload = function(event) {
        var contents = event.target.result;
        var a = new Image();
        a.src = contents;
        document.body.appendChild(a);
    }
    reader.readAsDataURL(e.data);
};

收起到信息,然后readAsDataURL,直接将图纸base64添加到页面中

接收到新闻,然后readAsDataURL,直接将图片base64添加到页面中

收纳到新闻,然后readAsDataURL,直接将图纸base64添加到页面中

转到服务器端代码

转到服务器端代码

转到服务器端代码

JavaScript

JavaScript

JavaScript

fs.readdir(“skyland”, function(err, files) { if(err) { throw err; }
for(var i = 0; i < files.length; i++) { fs.readFile(‘skyland/’ +
files[i], function(err, data) { if(err) { throw err; }
o.write(encodeImgFrame(data)); }); } }); function encodeImgFrame(buf) {
var s = [], l = buf.length, ret = []; s.push((1 << 7) + 2);
if(l < 126) { s.push(l); } else if(l < 0x10000) { s.push(126,
(l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0, 0, 0,
(l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), buf]); }

fs.readdir(“skyland”, function(err, files) { if(err) { throw err; }
for(var i = 0; i < files.length; i++) { fs.readFile(‘skyland/’ +
files[i], function(err, data) { if(err) { throw err; }
o.write(encodeImgFrame(data)); }); } }); function encodeImgFrame(buf) {
var s = [], l = buf.length, ret = []; s.push((1 << 7) + 2);
if(l < 126) { s.push(l); } else if(l < 0x10000) { s.push(126,
(l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0, 0, 0,
(l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), buf]); }

fs.readdir(“skyland”, function(err, files) { if(err) { throw err; }
for(var i = 0; i < files.length; i++) { fs.readFile(‘skyland/’ +
files[i], function(err, data) { if(err) { throw err; }
o.write(encodeImgFrame(data)); }); } }); function encodeImgFrame(buf) {
var s = [], l = buf.length, ret = []; s.push((1 << 7) + 2);
if(l < 126) { s.push(l); } else if(l < 0x10000) { s.push(126,
(l&0xFF00) >> 8, l&0xFF); } else { s.push(127, 0, 0, 0, 0,
(l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00)
>> 8, l&0xFF); } return Buffer.concat([new Buffer(s), buf]); }

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fs.readdir("skyland", function(err, files) {
if(err) {
throw err;
}
for(var i = 0; i < files.length; i++) {
fs.readFile(‘skyland/’ + files[i], function(err, data) {
if(err) {
throw err;
}
 
o.write(encodeImgFrame(data));
});
}
});
 
function encodeImgFrame(buf) {
var s = [],
l = buf.length,
ret = [];
 
s.push((1 << 7) + 2);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), buf]);
}
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fs.readdir("skyland", function(err, files) {
if(err) {
throw err;
}
for(var i = 0; i < files.length; i++) {
fs.readFile(‘skyland/’ + files[i], function(err, data) {
if(err) {
throw err;
}
 
o.write(encodeImgFrame(data));
});
}
});
 
function encodeImgFrame(buf) {
var s = [],
l = buf.length,
ret = [];
 
s.push((1 << 7) + 2);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), buf]);
}
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fs.readdir("skyland", function(err, files) {
if(err) {
throw err;
}
for(var i = 0; i < files.length; i++) {
fs.readFile(‘skyland/’ + files[i], function(err, data) {
if(err) {
throw err;
}
 
o.write(encodeImgFrame(data));
});
}
});
 
function encodeImgFrame(buf) {
var s = [],
l = buf.length,
ret = [];
 
s.push((1 << 7) + 2);
 
if(l < 126) {
s.push(l);
} else if(l < 0x10000) {
s.push(126, (l&0xFF00) >> 8, l&0xFF);
} else {
s.push(127, 0, 0, 0, 0, (l&0xFF000000) >> 24, (l&0xFF0000) >> 16, (l&0xFF00) >> 8, l&0xFF);
}
 
return Buffer.concat([new Buffer(s), buf]);
}

注意s.push((1 << 7) +
2)
这一句,那里杰出直接把opcode写死了为2,对于Binary
Frame,那样客户端接收到数码是不会尝试进行toString的,否则会报错~

注意s.push((1 << 7) +
2)
这一句,那里卓殊直接把opcode写死了为2,对于Binary
Frame,那样客户端接收到数码是不会尝试举办toString的,否则会报错~

注意s.push((1 << 7) +
2)
这一句,那里分外直接把opcode写死了为2,对于Binary
Frame,那样客户端接收到数码是不会尝试举行toString的,否则会报错~

代码很粗略,在那里向大家享受一下websocket传输图片的速度如何

代码很简单,在此处向我们享受一下websocket传输图片的快慢怎样

代码很简短,在此间向大家大快朵颐一下websocket传输图片的进程怎么样

测试很多张图纸,总共8.24M

测试很多张图纸,总共8.24M

测试很多张图纸,总共8.24M

平凡静态资源服务器须求20s左右(服务器较远)

一般性静态资源服务器必要20s左右(服务器较远)

一般而言静态资源服务器要求20s左右(服务器较远)

cdn需要2.8s左右

cdn需要2.8s左右

cdn需要2.8s左右

那大家的websocket格局呢??!

那大家的websocket方式啊??!

那大家的websocket格局呢??!

答案是一致需求20s左右,是否很失望……速度就是慢在传输上,并不是服务器读取图片,本机上一致的图形资源,1s左右得以成功……那样看来数据流也无从冲破距离的范围提升传输速度

答案是同一必要20s左右,是还是不是很失望……速度就是慢在传输上,并不是服务器读取图片,本机上平等的图样资源,1s左右足以形成……这样看来数据流也无能为力冲破距离的限定提升传输速度

答案是相同须求20s左右,是还是不是很失望……速度就是慢在传输上,并不是服务器读取图片,本机上同样的图片资源,1s左右方可做到……那样看来数据流也心慌意乱冲破距离的限量提升传输速度

下边大家来看看websocket的另一个用法~

下边大家来看望websocket的另一个用法~

下边大家来看看websocket的另一个用法~

 

 

 

用websocket搭建语音聊天室

用websocket搭建语音聊天室

用websocket搭建语音聊天室

先来收拾一下口音聊天室的法力

先来整理一下口音聊天室的成效

先来收拾一下口音聊天室的效率

用户进入频道随后从迈克风输入音频,然后发送给后台转载给频道里面的其余人,其余人接收到新闻举行广播

用户进入频道随后从迈克风输入音频,然后发送给后台转载给频道里面的其余人,其余人接收到音信进行广播

用户进入频道随后从迈克风输入音频,然后发送给后台转载给频道里面的其别人,其余人接收到音讯进行播报

看起来困难在八个地点,第三个是音频的输入,第二是收到到数量流进行广播

看起来困难在五个地点,第三个是音频的输入,第二是接受到数码流进行播放

看起来困难在七个地点,首个是音频的输入,第二是接到到多少流举办播报

先说音频的输入,那里运用了HTML5的getUserMedia方法,不过注意了,本条主意上线是有大坑的,最终说,先贴代码

先说音频的输入,那里运用了HTML5的getUserMedia方法,不过注意了,以此点子上线是有大坑的,最后说,先贴代码

先说音频的输入,那里运用了HTML5的getUserMedia方法,但是注意了,其一法子上线是有大坑的,最终说,先贴代码

JavaScript

JavaScript

JavaScript

if (navigator.getUserMedia) { navigator.getUserMedia( { audio: true },
function (stream) { var rec = new SRecorder(stream); recorder = rec; })
}

if (navigator.getUserMedia) { navigator.getUserMedia( { audio: true },
function (stream) { var rec = new SRecorder(stream); recorder = rec; })
}

if (navigator.getUserMedia) { navigator.getUserMedia( { audio: true },
function (stream) { var rec = new SRecorder(stream); recorder = rec; })
}

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if (navigator.getUserMedia) {
    navigator.getUserMedia(
        { audio: true },
        function (stream) {
            var rec = new SRecorder(stream);
            recorder = rec;
        })
}
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if (navigator.getUserMedia) {
    navigator.getUserMedia(
        { audio: true },
        function (stream) {
            var rec = new SRecorder(stream);
            recorder = rec;
        })
}
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if (navigator.getUserMedia) {
    navigator.getUserMedia(
        { audio: true },
        function (stream) {
            var rec = new SRecorder(stream);
            recorder = rec;
        })
}

第三个参数是{audio:
true},只启用音频,然后成立了一个SRecorder对象,后续的操作基本上都在这几个目的上展开。此时只要代码运行在地头的话浏览器应该提醒您是不是启用Mike风输入,确定今后就开动了

首先个参数是{audio:
true},只启用音频,然后创立了一个SRecorder对象,后续的操作基本上都在那么些目标上展开。此时一旦代码运行在该地的话浏览器应该提示您是还是不是启用Mike风输入,确定今后就启动了

第四个参数是{audio:
true},只启用音频,然后创设了一个SRecorder对象,后续的操作基本上都在那几个目标上拓展。此时倘使代码运行在地头的话浏览器应该升迁您是还是不是启用麦克风输入,确定之后就开动了

接下去大家看下SRecorder构造函数是啥,给出主要的一部分

接下去大家看下SRecorder构造函数是甚,给出首要的部分

接下去我们看下SRecorder构造函数是吗,给出紧要的局地

JavaScript

JavaScript

JavaScript

var SRecorder = function(stream) { …… var context = new AudioContext();
var audioInput = context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); …… }

var SRecorder = function(stream) { …… var context = new AudioContext();
var audioInput = context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); …… }

var SRecorder = function(stream) { …… var context = new AudioContext();
var audioInput = context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); …… }

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var SRecorder = function(stream) {
    ……
   var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
    ……
}
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var SRecorder = function(stream) {
    ……
   var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
    ……
}
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var SRecorder = function(stream) {
    ……
   var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
    ……
}

奥迪(Audi)oContext是一个旋律上下文对象,有做过声音过滤处理的同班应该通晓“一段音频到达扬声器举行广播在此以前,半路对其开展拦阻,于是大家就获取了旋律数据了,那个拦截工作是由window.奥迪(Audi)oContext来做的,大家拥有对旋律的操作都按照那么些目的”,大家得以经过奥迪oContext创造差其余奥迪oNode节点,然后添加滤镜播放特其余动静

AudioContext是一个节奏上下文对象,有做过声音过滤处理的同窗应该清楚“一段音频到达扬声器举办播放以前,半路对其展开拦截,于是大家就获取了拍子数据了,那一个拦截工作是由window.奥迪(Audi)oContext来做的,大家所有对旋律的操作都依照那些目的”,大家可以透过奥迪(Audi)oContext创造差距的奥迪oNode节点,然后添加滤镜播放特其他声息

奥迪(Audi)oContext是一个节奏上下文对象,有做过声音过滤处理的同窗应该知道“一段音频到达扬声器举行广播从前,半路对其举行阻拦,于是大家就赢得了点子数据了,这些拦截工作是由window.奥迪oContext来做的,大家具有对旋律的操作都基于那几个目的”,我们能够通过奥迪oContext成立不一致的奥迪oNode节点,然后添加滤镜播放特其余声响

录音原理一样,大家也急需走奥迪(Audi)oContext,不过多了一步对迈克风音频输入的收纳上,而不是像过去处理音频一下用ajax请求音频的ArrayBuffer对象再decode,迈克风的承受要求用到createMediaStreamSource方法,注意那么些参数就是getUserMedia方法第一个参数的参数

录音原理一样,大家也须求走奥迪(Audi)oContext,然则多了一步对迈克风音频输入的接受上,而不是像以往处理音频一下用ajax请求音频的ArrayBuffer对象再decode,Mike风的接受须要用到createMediaStreamSource方法,注意这么些参数就是getUserMedia方法第一个参数的参数

录音原理一样,我们也亟需走奥迪oContext,但是多了一步对Mike风音频输入的接受上,而不是像过去处理音频一下用ajax请求音频的ArrayBuffer对象再decode,迈克风的接受需求用到createMediaStreamSource方法,注意这么些参数就是getUserMedia方法第一个参数的参数

再则createScriptProcessor方法,它官方的诠释是:

况且createScriptProcessor方法,它官方的演说是:

加以createScriptProcessor方法,它官方的表达是:

Creates a ScriptProcessorNode, which can be used for direct audio
processing via JavaScript.

Creates a ScriptProcessorNode, which can be used for direct audio
processing via JavaScript.

Creates a ScriptProcessorNode, which can be used for direct audio
processing via JavaScript.

——————

——————

——————

概括下就是那么些法子是行使JavaScript去处理音频采集操作

包涵下就是这么些主意是应用JavaScript去处理音频采集操作

包涵下就是那个方式是运用JavaScript去处理音频采集操作

追根究底到点子采集了!胜利就在前边!

毕竟到点子采集了!胜利就在前方!

好不简单到点子采集了!胜利就在眼前!

接下去让大家把迈克风的输入和音频采集相连起来

接下去让大家把话筒的输入和节奏采集相连起来

接下去让大家把Mike风的输入和韵律采集相连起来

JavaScript

JavaScript

JavaScript

audioInput.connect(recorder); recorder.connect(context.destination);

audioInput.connect(recorder); recorder.connect(context.destination);

audioInput.connect(recorder); recorder.connect(context.destination);

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audioInput.connect(recorder);
recorder.connect(context.destination);
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audioInput.connect(recorder);
recorder.connect(context.destination);
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audioInput.connect(recorder);
recorder.connect(context.destination);

context.destination官方解释如下

context.destination官方解释如下

context.destination官方表达如下

The destination property of
the AudioContext interface
returns
an AudioDestinationNoderepresenting
the final destination of all audio in the context.

The destination property of
the AudioContext interface
returns
an AudioDestinationNoderepresenting
the final destination of all audio in the context.

The destination property of
the AudioContext interface
returns
an AudioDestinationNoderepresenting
the final destination of all audio in the context.

——————

——————

——————

context.destination重临代表在条件中的音频的末尾目标地。

context.destination重回代表在环境中的音频的结尾目的地。

context.destination重临代表在环境中的音频的最后目的地。

好,到了那儿,大家还亟需一个监听音频采集的事件

好,到了此时,大家还要求一个监听音频采集的事件

好,到了那儿,我们还需求一个监听音频采集的事件

JavaScript

JavaScript

JavaScript

recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); }

recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); }

recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); }

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recorder.onaudioprocess = function (e) {
    audioData.input(e.inputBuffer.getChannelData(0));
}
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recorder.onaudioprocess = function (e) {
    audioData.input(e.inputBuffer.getChannelData(0));
}
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recorder.onaudioprocess = function (e) {
    audioData.input(e.inputBuffer.getChannelData(0));
}

audioData是一个对象,那些是在网上找的,我就加了一个clear方法因为背后会用到,主要有相当encodeWAV方法很赞,旁人进行了频仍的点子压缩和优化,那么些最终会陪伴完整的代码一起贴出来

audioData是一个指标,这一个是在网上找的,我就加了一个clear方法因为后面会用到,主要有充足encodeWAV方法很赞,外人进行了频仍的音频压缩和优化,这么些最后会伴随完整的代码一起贴出来

audioData是一个对象,这一个是在网上找的,我就加了一个clear方法因为背后会用到,主要有这些encodeWAV方法很赞,别人举办了累累的点子压缩和优化,那几个最后会陪伴完整的代码一起贴出来

这会儿整整用户进入频道随后从迈克风输入音频环节就已经达成啦,下边就该是向服务器端发送音频流,稍微有点蛋疼的来了,刚才大家说了,websocket通过opcode差别可以表示回去的多寡是文本仍然二进制数据,而大家onaudioprocess中input进去的是数组,最后播放音响需求的是Blob,{type:
‘audio/wav’}的对象,那样大家就亟必要在发送此前将数组转换成WAV的Blob,此时就用到了上边说的encodeWAV方法

那会儿所有用户进入频道随后从迈克风输入音频环节就曾经完毕啦,上面就该是向劳动器端发送音频流,稍微有点蛋疼的来了,刚才我们说了,websocket通过opcode分歧可以象征回去的数额是文本依然二进制数据,而大家onaudioprocess中input进去的是数组,最终播放音响须要的是Blob,{type:
‘audio/wav’}的靶子,那样我们就亟需要在发送在此之前将数组转换成WAV的Blob,此时就用到了上边说的encodeWAV方法

那时候整个用户进入频道随后从Mike风输入音频环节就已经到位啦,上面就该是向劳动器端发送音频流,稍微有点蛋疼的来了,刚才我们说了,websocket通过opcode分裂可以代表回去的数码是文件依然二进制数据,而我辈onaudioprocess中input进去的是数组,最终播放声音必要的是Blob,{type:
‘audio/wav’}的对象,那样大家就非得要在殡葬此前将数组转换成WAV的Blob,此时就用到了上边说的encodeWAV方法

服务器如同很粗略,只要转发就行了

服务器就好像很简短,只要转发就行了

服务器如同很简单,只要转载就行了

地点测试确实可以,不过天坑来了!将顺序跑在服务器上时候调用getUserMedia方法提醒我必须在一个平凉的环境,也就是须要https,那意味ws也必须换成wss……为此服务器代码就没有运用大家团结一心包装的拉手、解析和编码了,代码如下

本土测试确实可以,可是天坑来了!将先后跑在服务器上时候调用getUserMedia方法提醒我不可以不在一个康宁的条件,也就是急需https,这代表ws也不可以不换成wss……所以服务器代码就不曾应用大家温馨包裹的抓手、解析和编码了,代码如下

地面测试确实可以,不过天坑来了!将次第跑在服务器上时候调用getUserMedia方法提醒我不可以不在一个有惊无险的条件,也就是亟需https,那象征ws也不可以不换成wss……故而服务器代码就从未有过使用大家团结一心包装的抓手、解析和编码了,代码如下

JavaScript

JavaScript

JavaScript

var https = require(‘https’); var fs = require(‘fs’); var ws =
require(‘ws’); var userMap = Object.create(null); var options = { key:
fs.readFileSync(‘./privatekey.pem’), cert:
fs.readFileSync(‘./certificate.pem’) }; var server =
https.createServer(options, function(req, res) { res.writeHead({
‘Content-Type’ : ‘text/html’ }); fs.readFile(‘./testaudio.html’,
function(err, data) { if(err) { return ; } res.end(data); }); }); var
wss = new ws.Server({server: server}); wss.on(‘connection’, function(o)
{ o.on(‘message’, function(message) { if(message.indexOf(‘user’) === 0)
{ var user = message.split(‘:’)[1]; userMap[user] = o; } else {
for(var u in userMap) { userMap[u].send(message); } } }); });
server.listen(8888);

var https = require(‘https’); var fs = require(‘fs’); var ws =
require(‘ws’); var userMap = Object.create(null); var options = { key:
fs.readFileSync(‘./privatekey.pem’), cert:
fs.readFileSync(‘./certificate.pem’) }; var server =
https.createServer(options, function(req, res) { res.writeHead({
‘Content-Type’ : ‘text/html’ }); fs.readFile(‘./testaudio.html’,
function(err, data) { if(err) { return ; } res.end(data); }); }); var
wss = new ws.Server({server: server}); wss.on(‘connection’, function(o)
{ o.on(‘message’, function(message) { if(message.indexOf(‘user’) === 0)
{ var user = message.split(‘:’)[1]; userMap[user] = o; } else {
for(var u in userMap) { userMap[u].send(message); } } }); });
server.listen(8888);

var https = require(‘https’); var fs = require(‘fs’); var ws =
require(‘ws’); var userMap = Object.create(null); var options = { key:
fs.readFileSync(‘./privatekey.pem’), cert:
fs.readFileSync(‘./certificate.pem’) }; var server =
https.createServer(options, function(req, res) { res.writeHead({
‘Content-Type’ : ‘text/html’ }); fs.readFile(‘./testaudio.html’,
function(err, data) { if(err) { return ; } res.end(data); }); }); var
wss = new ws.Server({server: server}); wss.on(‘connection’, function(o)
{ o.on(‘message’, function(message) { if(message.indexOf(‘user’) === 0)
{ var user = message.split(‘:’)[1]; userMap[user] = o; } else {
for(var u in userMap) { userMap[u].send(message); } } }); });
server.listen(8888);

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var https = require(‘https’);
var fs = require(‘fs’);
var ws = require(‘ws’);
var userMap = Object.create(null);
var options = {
    key: fs.readFileSync(‘./privatekey.pem’),
    cert: fs.readFileSync(‘./certificate.pem’)
};
var server = https.createServer(options, function(req, res) {
    res.writeHead({
        ‘Content-Type’ : ‘text/html’
    });
 
    fs.readFile(‘./testaudio.html’, function(err, data) {
        if(err) {
            return ;
        }
 
        res.end(data);
    });
});
 
var wss = new ws.Server({server: server});
 
wss.on(‘connection’, function(o) {
    o.on(‘message’, function(message) {
if(message.indexOf(‘user’) === 0) {
    var user = message.split(‘:’)[1];
    userMap[user] = o;
} else {
    for(var u in userMap) {
userMap[u].send(message);
    }
}
    });
});
 
server.listen(8888);
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var https = require(‘https’);
var fs = require(‘fs’);
var ws = require(‘ws’);
var userMap = Object.create(null);
var options = {
    key: fs.readFileSync(‘./privatekey.pem’),
    cert: fs.readFileSync(‘./certificate.pem’)
};
var server = https.createServer(options, function(req, res) {
    res.writeHead({
        ‘Content-Type’ : ‘text/html’
    });
 
    fs.readFile(‘./testaudio.html’, function(err, data) {
        if(err) {
            return ;
        }
 
        res.end(data);
    });
});
 
var wss = new ws.Server({server: server});
 
wss.on(‘connection’, function(o) {
    o.on(‘message’, function(message) {
if(message.indexOf(‘user’) === 0) {
    var user = message.split(‘:’)[1];
    userMap[user] = o;
} else {
    for(var u in userMap) {
userMap[u].send(message);
    }
}
    });
});
 
server.listen(8888);
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var https = require(‘https’);
var fs = require(‘fs’);
var ws = require(‘ws’);
var userMap = Object.create(null);
var options = {
    key: fs.readFileSync(‘./privatekey.pem’),
    cert: fs.readFileSync(‘./certificate.pem’)
};
var server = https.createServer(options, function(req, res) {
    res.writeHead({
        ‘Content-Type’ : ‘text/html’
    });
 
    fs.readFile(‘./testaudio.html’, function(err, data) {
        if(err) {
            return ;
        }
 
        res.end(data);
    });
});
 
var wss = new ws.Server({server: server});
 
wss.on(‘connection’, function(o) {
    o.on(‘message’, function(message) {
if(message.indexOf(‘user’) === 0) {
    var user = message.split(‘:’)[1];
    userMap[user] = o;
} else {
    for(var u in userMap) {
userMap[u].send(message);
    }
}
    });
});
 
server.listen(8888);

代码依旧很简短的,使用https模块,然后用了启幕说的ws模块,userMap是人云亦云的频道,只兑现转载的主题功用

代码依然很简短的,使用https模块,然后用了始于说的ws模块,userMap是人云亦云的频道,只兑现转载的主旨功能

代码仍旧很简短的,使用https模块,然后用了发轫说的ws模块,userMap是模仿的频段,只兑现转载的基本成效

采纳ws模块是因为它非常https完成wss实在是太方便了,和逻辑代码0争执

拔取ws模块是因为它卓殊https完成wss实在是太便宜了,和逻辑代码0龃龉

动用ws模块是因为它万分https完成wss实在是太便宜了,和逻辑代码0顶牛

https的搭建在那边就不提了,重假使亟需私钥、CSR证书签名和注解文件,感兴趣的同学可以明白下(不过不打听的话在现网环境也用持续getUserMedia……)

https的搭建在此间就不提了,重假如内需私钥、CSR证书签名和证件文件,感兴趣的同学可以了然下(不过不打听的话在现网环境也用持续getUserMedia……)

https的搭建在这里就不提了,紧假如须求私钥、CSR证书签名和证书文件,感兴趣的同室可以通晓下(可是不通晓的话在现网环境也用持续getUserMedia……)

下边是全体的前端代码

下边是共同体的前端代码

下边是一体化的前端代码

JavaScript

JavaScript

JavaScript

var a = document.getElementById(‘a’); var b =
document.getElementById(‘b’); var c = document.getElementById(‘c’);
navigator.getUserMedia = navigator.getUserMedia ||
navigator.webkitGetUserMedia; var gRecorder = null; var audio =
document.querySelector(‘audio’); var door = false; var ws = null;
b.onclick = function() { if(a.value === ”) { alert(‘请输入用户名’);
return false; } if(!navigator.getUserMedia) {
alert(‘抱歉您的配备无葡萄牙语音聊天’); return false; }
SRecorder.get(function (rec) { gRecorder = rec; }); ws = new
WebSocket(“wss://x.x.x.x:8888”); ws.onopen = function() {
console.log(‘握手成功’); ws.send(‘user:’ + a.value); }; ws.onmessage =
function(e) { receive(e.data); }; document.onkeydown = function(e) {
if(e.keyCode === 65) { if(!door) { gRecorder.start(); door = true; } }
}; document.onkeyup = function(e) { if(e.keyCode === 65) { if(door) {
ws.send(gRecorder.getBlob()); gRecorder.clear(); gRecorder.stop(); door
= false; } } } } c.onclick = function() { if(ws) { ws.close(); } } var
SRecorder = function(stream) { config = {}; config.sampleBits =
config.smapleBits || 8; config.sampleRate = config.sampleRate || (44100
/ 6); var context = new 奥迪oContext(); var audioInput =
context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); var audioData = { size: 0
//录音文件长度 , buffer: [] //录音缓存 , inputSampleRate:
context.sampleRate //输入采样率 , inputSampleBits: 16 //输入采样数位 8,
16 , outputSampleRate: config.sampleRate //输出采样率 , oututSampleBits:
config.sampleBits //输出采样数位 8, 16 , clear: function() { this.buffer
= []; this.size = 0; } , input: function (data) { this.buffer.push(new
Float32Array(data)); this.size += data.length; } , compress: function ()
{ //合并压缩 //合并 var data = new Float32Array(this.size); var offset =
0; for (var i = 0; i < this.buffer.length; i++) {
data.set(this.buffer[i], offset); offset += this.buffer[i].length; }
//压缩 var compression = parseInt(this.inputSampleRate /
this.outputSampleRate); var length = data.length / compression; var
result = new Float32Array(length); var index = 0, j = 0; while (index
< length) { result[index] = data[j]; j += compression; index++; }
return result; } , encodeWAV: function () { var sampleRate =
Math.min(this.inputSampleRate, this.outputSampleRate); var sampleBits =
Math.min(this.inputSampleBits, this.oututSampleBits); var bytes =
this.compress(); var dataLength = bytes.length * (sampleBits / 8); var
buffer = new ArrayBuffer(44 + dataLength); var data = new
DataView(buffer); var channelCount = 1;//单声道 var offset = 0; var
writeString = function (str) { for (var i = 0; i < str.length; i++) {
data.setUint8(offset + i, str.charCodeAt(i)); } }; // 资源调换文件标识符
writeString(‘RIFF’); offset += 4; //
下个地方开始到文件尾总字节数,即文件大小-8 data.setUint32(offset, 36 +
dataLength, true); offset += 4; // WAV文件申明 writeString(‘WAVE’);
offset += 4; // 波形格式标志 writeString(‘fmt ‘); offset += 4; //
过滤字节,一般为 0x10 = 16 data.setUint32(offset, 16, true); offset += 4;
// 格式序列 (PCM格局采样数据) data.setUint16(offset, 1, true); offset +=
2; // 通道数 data.setUint16(offset, channelCount, true); offset += 2; //
采样率,每秒样本数,表示每个通道的播音速度 data.setUint32(offset,
sampleRate, true); offset += 4; // 波形数据传输率 (每秒平均字节数)
单声道×每秒数据位数×每样本数据位/8 data.setUint32(offset, channelCount
* sampleRate * (sampleBits / 8), true); offset += 4; // 快数据调整数
采样一回占用字节数 单声道×每样本的多少位数/8 data.setUint16(offset,
channelCount * (sampleBits / 8), true); offset += 2; // 每样本数量位数
data.setUint16(offset, sampleBits, true); offset += 2; // 数据标识符
writeString(‘data’); offset += 4; // 采样数据总数,即数据总大小-44
data.setUint32(offset, dataLength, true); offset += 4; // 写入采样数据
if (sampleBits === 8) { for (var i = 0; i < bytes.length; i++,
offset++) { var s = Math.max(-1, Math.min(1, bytes[i])); var val = s
< 0 ? s * 0x8000 : s * 0x7FFF; val = parseInt(255 / (65535 / (val +
32768))); data.setInt8(offset, val, true); } } else { for (var i = 0; i
< bytes.length; i++, offset += 2) { var s = Math.max(-1, Math.min(1,
bytes[i])); data.setInt16(offset, s < 0 ? s * 0x8000 : s *
0x7FFF, true); } } return new Blob([data], { type: ‘audio/wav’ }); }
}; this.start = function () { audioInput.connect(recorder);
recorder.connect(context.destination); } this.stop = function () {
recorder.disconnect(); } this.getBlob = function () { return
audioData.encodeWAV(); } this.clear = function() { audioData.clear(); }
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); } }; SRecorder.get =
function (callback) { if (callback) { if (navigator.getUserMedia) {
navigator.getUserMedia( { audio: true }, function (stream) { var rec =
new SRecorder(stream); callback(rec); }) } } } function receive(e) {
audio.src = window.URL.createObjectURL(e); }

var a = document.getElementById(‘a’); var b =
document.getElementById(‘b’); var c = document.getElementById(‘c’);
navigator.getUserMedia = navigator.getUserMedia ||
navigator.webkitGetUserMedia; var gRecorder = null; var audio =
document.querySelector(‘audio’); var door = false; var ws = null;
b.onclick = function() { if(a.value === ”) { alert(‘请输入用户名’);
return false; } if(!navigator.getUserMedia) {
alert(‘抱歉您的设备无立陶宛语音聊天’); return false; }
SRecorder.get(function (rec) { gRecorder = rec; }); ws = new
WebSocket(“wss://x.x.x.x:8888”); ws.onopen = function() {
console.log(‘握手成功’); ws.send(‘user:’ + a.value); }; ws.onmessage =
function(e) { receive(e.data); }; document.onkeydown = function(e) {
if(e.keyCode === 65) { if(!door) { gRecorder.start(); door = true; } }
}; document.onkeyup = function(e) { if(e.keyCode === 65) { if(door) {
ws.send(gRecorder.getBlob()); gRecorder.clear(); gRecorder.stop(); door
= false; } } } } c.onclick = function() { if(ws) { ws.close(); } } var
SRecorder = function(stream) { config = {}; config.sampleBits =
config.smapleBits || 8; config.sampleRate = config.sampleRate || (44100
/ 6); var context = new 奥迪(Audi)oContext(); var audioInput =
context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); var audioData = { size: 0
//录音文件长度 , buffer: [] //录音缓存 , inputSampleRate:
context.sampleRate //输入采样率 , inputSampleBits: 16 //输入采样数位 8,
16 , outputSampleRate: config.sampleRate //输出采样率 , oututSampleBits:
config.sampleBits //输出采样数位 8, 16 , clear: function() { this.buffer
= []; this.size = 0; } , input: function (data) { this.buffer.push(new
Float32Array(data)); this.size += data.length; } , compress: function ()
{ //合并压缩 //合并 var data = new Float32Array(this.size); var offset =
0; for (var i = 0; i < this.buffer.length; i++) {
data.set(this.buffer[i], offset); offset += this.buffer[i].length; }
//压缩 var compression = parseInt(this.inputSampleRate /
this.outputSampleRate); var length = data.length / compression; var
result = new Float32Array(length); var index = 0, j = 0; while (index
< length) { result[index] = data[j]; j += compression; index++; }
return result; } , encodeWAV: function () { var sampleRate =
Math.min(this.inputSampleRate, this.outputSampleRate); var sampleBits =
Math.min(this.inputSampleBits, this.oututSampleBits); var bytes =
this.compress(); var dataLength = bytes.length * (sampleBits / 8); var
buffer = new ArrayBuffer(44 + dataLength); var data = new
DataView(buffer); var channelCount = 1;//单声道 var offset = 0; var
writeString = function (str) { for (var i = 0; i < str.length; i++) {
data.setUint8(offset + i, str.charCodeAt(i)); } }; // 资源调换文件标识符
writeString(‘RIFF’); offset += 4; //
下个地方开端到文件尾总字节数,即文件大小-8 data.setUint32(offset, 36 +
dataLength, true); offset += 4; // WAV文件注明 writeString(‘WAVE’);
offset += 4; // 波形格式标志 writeString(‘fmt ‘); offset += 4; //
过滤字节,一般为 0x10 = 16 data.setUint32(offset, 16, true); offset += 4;
// 格式系列 (PCM方式采样数据) data.setUint16(offset, 1, true); offset +=
2; // 通道数 data.setUint16(offset, channelCount, true); offset += 2; //
采样率,每秒样本数,表示每个通道的播放速度 data.setUint32(offset,
sampleRate, true); offset += 4; // 波形数据传输率 (每秒平均字节数)
单声道×每秒数据位数×每样本数据位/8 data.setUint32(offset, channelCount
* sampleRate * (sampleBits / 8), true); offset += 4; // 快数据调整数
采样几回占用字节数 单声道×每样本的数据位数/8 data.setUint16(offset,
channelCount * (sampleBits / 8), true); offset += 2; // 每样本数量位数
data.setUint16(offset, sampleBits, true); offset += 2; // 数据标识符
writeString(‘data’); offset += 4; // 采样数据总数,即数据总大小-44
data.setUint32(offset, dataLength, true); offset += 4; // 写入采样数据
if (sampleBits === 8) { for (var i = 0; i < bytes.length; i++,
offset++) { var s = Math.max(-1, Math.min(1, bytes[i])); var val = s
< 0 ? s * 0x8000 : s * 0x7FFF; val = parseInt(255 / (65535 / (val +
32768))); data.setInt8(offset, val, true); } } else { for (var i = 0; i
< bytes.length; i++, offset += 2) { var s = Math.max(-1, Math.min(1,
bytes[i])); data.setInt16(offset, s < 0 ? s * 0x8000 : s *
0x7FFF, true); } } return new Blob([data], { type: ‘audio/wav’ }); }
}; this.start = function () { audioInput.connect(recorder);
recorder.connect(context.destination); } this.stop = function () {
recorder.disconnect(); } this.getBlob = function () { return
audioData.encodeWAV(); } this.clear = function() { audioData.clear(); }
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); } }; SRecorder.get =
function (callback) { if (callback) { if (navigator.getUserMedia) {
navigator.getUserMedia( { audio: true }, function (stream) { var rec =
new SRecorder(stream); callback(rec); }) } } } function receive(e) {
audio.src = window.URL.createObjectURL(e); }

var a = document.getElementById(‘a’); var b =
document.getElementById(‘b’); var c = document.getElementById(‘c’);
navigator.getUserMedia = navigator.getUserMedia ||
navigator.webkitGetUserMedia; var gRecorder = null; var audio =
document.querySelector(‘audio’); var door = false; var ws = null;
b.onclick = function() { if(a.value === ”) { alert(‘请输入用户名’);
return false; } if(!navigator.getUserMedia) {
alert(‘抱歉您的设施无爱沙尼亚语音聊天’); return false; }
SRecorder.get(function (rec) { gRecorder = rec; }); ws = new
WebSocket(“wss://x.x.x.x:8888”); ws.onopen = function() {
console.log(‘握手成功’); ws.send(‘user:’ + a.value); }; ws.onmessage =
function(e) { receive(e.data); }; document.onkeydown = function(e) {
if(e.keyCode === 65) { if(!door) { gRecorder.start(); door = true; } }
}; document.onkeyup = function(e) { if(e.keyCode === 65) { if(door) {
ws.send(gRecorder.getBlob()); gRecorder.clear(); gRecorder.stop(); door
= false; } } } } c.onclick = function() { if(ws) { ws.close(); } } var
SRecorder = function(stream) { config = {}; config.sampleBits =
config.smapleBits || 8; config.sampleRate = config.sampleRate || (44100
/ 6); var context = new 奥迪oContext(); var audioInput =
context.createMediaStreamSource(stream); var recorder =
context.createScriptProcessor(4096, 1, 1); var audioData = { size: 0
//录音文件长度 , buffer: [] //录音缓存 , inputSampleRate:
context.sampleRate //输入采样率 , input萨姆pleBits: 16 //输入采样数位 8,
16 , output萨姆pleRate: config.sampleRate //输出采样率 , oututSampleBits:
config.sampleBits //输出采样数位 8, 16 , clear: function() { this.buffer
= []; this.size = 0; } , input: function (data) { this.buffer.push(new
Float32Array(data)); this.size += data.length; } , compress: function ()
{ //合并压缩 //合并 var data = new Float32Array(this.size); var offset =
0; for (var i = 0; i < this.buffer.length; i++) {
data.set(this.buffer[i], offset); offset += this.buffer[i].length; }
//压缩 var compression = parseInt(this.inputSampleRate /
this.outputSampleRate); var length = data.length / compression; var
result = new Float32Array(length); var index = 0, j = 0; while (index
< length) { result[index] = data[j]; j += compression; index++; }
return result; } , encodeWAV: function () { var sampleRate =
Math.min(this.inputSampleRate, this.outputSampleRate); var sampleBits =
Math.min(this.inputSampleBits, this.oututSampleBits); var bytes =
this.compress(); var dataLength = bytes.length * (sampleBits / 8); var
buffer = new ArrayBuffer(44 + dataLength); var data = new
DataView(buffer); var channelCount = 1;//单声道 var offset = 0; var
writeString = function (str) { for (var i = 0; i < str.length; i++) {
data.setUint8(offset + i, str.charCodeAt(i)); } }; // 资源调换文件标识符
writeString(‘RIFF’); offset += 4; //
下个地点起首到文件尾总字节数,即文件大小-8 data.setUint32(offset, 36 +
dataLength, true); offset += 4; // WAV文件注明 writeString(‘WAVE’);
offset += 4; // 波形格式标志 writeString(‘fmt ‘); offset += 4; //
过滤字节,一般为 0x10 = 16 data.setUint32(offset, 16, true); offset += 4;
// 格式体系 (PCM形式采样数据) data.setUint16(offset, 1, true); offset +=
2; // 通道数 data.setUint16(offset, channelCount, true); offset += 2; //
采样率,每秒样本数,表示每个通道的播放速度 data.setUint32(offset,
sampleRate, true); offset += 4; // 波形数据传输率 (每秒平均字节数)
单声道×每秒数据位数×每样本数据位/8 data.setUint32(offset, channelCount
* sampleRate * (sampleBits / 8), true); offset += 4; // 快数据调整数
采样五次占用字节数 单声道×每样本的数目位数/8 data.setUint16(offset,
channelCount * (sampleBits / 8), true); offset += 2; // 每样本数量位数
data.setUint16(offset, sampleBits, true); offset += 2; // 数据标识符
writeString(‘data’); offset += 4; // 采样数据总数,即数据总大小-44
data.setUint32(offset, dataLength, true); offset += 4; // 写入采样数据
if (sampleBits === 8) { for (var i = 0; i < bytes.length; i++,
offset++) { var s = Math.max(-1, Math.min(1, bytes[i])); var val = s
< 0 ? s * 0x8000 : s * 0x7FFF; val = parseInt(255 / (65535 / (val +
32768))); data.setInt8(offset, val, true); } } else { for (var i = 0; i
< bytes.length; i++, offset += 2) { var s = Math.max(-1, Math.min(1,
bytes[i])); data.setInt16(offset, s < 0 ? s * 0x8000 : s *
0x7FFF, true); } } return new Blob([data], { type: ‘audio/wav’ }); }
}; this.start = function () { audioInput.connect(recorder);
recorder.connect(context.destination); } this.stop = function () {
recorder.disconnect(); } this.getBlob = function () { return
audioData.encodeWAV(); } this.clear = function() { audioData.clear(); }
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0)); } }; SRecorder.get =
function (callback) { if (callback) { if (navigator.getUserMedia) {
navigator.getUserMedia( { audio: true }, function (stream) { var rec =
new SRecorder(stream); callback(rec); }) } } } function receive(e) {
audio.src = window.URL.createObjectURL(e); }

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var a = document.getElementById(‘a’);
var b = document.getElementById(‘b’);
var c = document.getElementById(‘c’);
 
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia;
 
var gRecorder = null;
var audio = document.querySelector(‘audio’);
var door = false;
var ws = null;
 
b.onclick = function() {
    if(a.value === ”) {
        alert(‘请输入用户名’);
        return false;
    }
    if(!navigator.getUserMedia) {
        alert(‘抱歉您的设备无法语音聊天’);
        return false;
    }
 
    SRecorder.get(function (rec) {
        gRecorder = rec;
    });
 
    ws = new WebSocket("wss://x.x.x.x:8888");
 
    ws.onopen = function() {
        console.log(‘握手成功’);
        ws.send(‘user:’ + a.value);
    };
 
    ws.onmessage = function(e) {
        receive(e.data);
    };
 
    document.onkeydown = function(e) {
        if(e.keyCode === 65) {
            if(!door) {
                gRecorder.start();
                door = true;
            }
        }
    };
 
    document.onkeyup = function(e) {
        if(e.keyCode === 65) {
            if(door) {
                ws.send(gRecorder.getBlob());
                gRecorder.clear();
                gRecorder.stop();
                door = false;
            }
        }
    }
}
 
c.onclick = function() {
    if(ws) {
        ws.close();
    }
}
 
var SRecorder = function(stream) {
    config = {};
 
    config.sampleBits = config.smapleBits || 8;
    config.sampleRate = config.sampleRate || (44100 / 6);
 
    var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
 
    var audioData = {
        size: 0          //录音文件长度
        , buffer: []     //录音缓存
        , inputSampleRate: context.sampleRate    //输入采样率
        , inputSampleBits: 16       //输入采样数位 8, 16
        , outputSampleRate: config.sampleRate    //输出采样率
        , oututSampleBits: config.sampleBits       //输出采样数位 8, 16
        , clear: function() {
            this.buffer = [];
            this.size = 0;
        }
        , input: function (data) {
            this.buffer.push(new Float32Array(data));
            this.size += data.length;
        }
        , compress: function () { //合并压缩
            //合并
            var data = new Float32Array(this.size);
            var offset = 0;
            for (var i = 0; i < this.buffer.length; i++) {
                data.set(this.buffer[i], offset);
                offset += this.buffer[i].length;
            }
            //压缩
            var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
            var length = data.length / compression;
            var result = new Float32Array(length);
            var index = 0, j = 0;
            while (index < length) {
                result[index] = data[j];
                j += compression;
                index++;
            }
            return result;
        }
        , encodeWAV: function () {
            var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
            var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
            var bytes = this.compress();
            var dataLength = bytes.length * (sampleBits / 8);
            var buffer = new ArrayBuffer(44 + dataLength);
            var data = new DataView(buffer);
 
            var channelCount = 1;//单声道
            var offset = 0;
 
            var writeString = function (str) {
                for (var i = 0; i < str.length; i++) {
                    data.setUint8(offset + i, str.charCodeAt(i));
                }
            };
 
            // 资源交换文件标识符
            writeString(‘RIFF’); offset += 4;
            // 下个地址开始到文件尾总字节数,即文件大小-8
            data.setUint32(offset, 36 + dataLength, true); offset += 4;
            // WAV文件标志
            writeString(‘WAVE’); offset += 4;
            // 波形格式标志
            writeString(‘fmt ‘); offset += 4;
            // 过滤字节,一般为 0x10 = 16
            data.setUint32(offset, 16, true); offset += 4;
            // 格式类别 (PCM形式采样数据)
            data.setUint16(offset, 1, true); offset += 2;
            // 通道数
            data.setUint16(offset, channelCount, true); offset += 2;
            // 采样率,每秒样本数,表示每个通道的播放速度
            data.setUint32(offset, sampleRate, true); offset += 4;
            // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
            data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
            // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
            data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
            // 每样本数据位数
            data.setUint16(offset, sampleBits, true); offset += 2;
            // 数据标识符
            writeString(‘data’); offset += 4;
            // 采样数据总数,即数据总大小-44
            data.setUint32(offset, dataLength, true); offset += 4;
            // 写入采样数据
            if (sampleBits === 8) {
                for (var i = 0; i < bytes.length; i++, offset++) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
                    val = parseInt(255 / (65535 / (val + 32768)));
                    data.setInt8(offset, val, true);
                }
            } else {
                for (var i = 0; i < bytes.length; i++, offset += 2) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
                }
            }
 
            return new Blob([data], { type: ‘audio/wav’ });
        }
    };
 
    this.start = function () {
        audioInput.connect(recorder);
        recorder.connect(context.destination);
    }
 
    this.stop = function () {
        recorder.disconnect();
    }
 
    this.getBlob = function () {
        return audioData.encodeWAV();
    }
 
    this.clear = function() {
        audioData.clear();
    }
 
    recorder.onaudioprocess = function (e) {
        audioData.input(e.inputBuffer.getChannelData(0));
    }
};
 
SRecorder.get = function (callback) {
    if (callback) {
        if (navigator.getUserMedia) {
            navigator.getUserMedia(
                { audio: true },
                function (stream) {
                    var rec = new SRecorder(stream);
                    callback(rec);
                })
        }
    }
}
 
function receive(e) {
    audio.src = window.URL.createObjectURL(e);
}
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var a = document.getElementById(‘a’);
var b = document.getElementById(‘b’);
var c = document.getElementById(‘c’);
 
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia;
 
var gRecorder = null;
var audio = document.querySelector(‘audio’);
var door = false;
var ws = null;
 
b.onclick = function() {
    if(a.value === ”) {
        alert(‘请输入用户名’);
        return false;
    }
    if(!navigator.getUserMedia) {
        alert(‘抱歉您的设备无法语音聊天’);
        return false;
    }
 
    SRecorder.get(function (rec) {
        gRecorder = rec;
    });
 
    ws = new WebSocket("wss://x.x.x.x:8888");
 
    ws.onopen = function() {
        console.log(‘握手成功’);
        ws.send(‘user:’ + a.value);
    };
 
    ws.onmessage = function(e) {
        receive(e.data);
    };
 
    document.onkeydown = function(e) {
        if(e.keyCode === 65) {
            if(!door) {
                gRecorder.start();
                door = true;
            }
        }
    };
 
    document.onkeyup = function(e) {
        if(e.keyCode === 65) {
            if(door) {
                ws.send(gRecorder.getBlob());
                gRecorder.clear();
                gRecorder.stop();
                door = false;
            }
        }
    }
}
 
c.onclick = function() {
    if(ws) {
        ws.close();
    }
}
 
var SRecorder = function(stream) {
    config = {};
 
    config.sampleBits = config.smapleBits || 8;
    config.sampleRate = config.sampleRate || (44100 / 6);
 
    var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
 
    var audioData = {
        size: 0          //录音文件长度
        , buffer: []     //录音缓存
        , inputSampleRate: context.sampleRate    //输入采样率
        , inputSampleBits: 16       //输入采样数位 8, 16
        , outputSampleRate: config.sampleRate    //输出采样率
        , oututSampleBits: config.sampleBits       //输出采样数位 8, 16
        , clear: function() {
            this.buffer = [];
            this.size = 0;
        }
        , input: function (data) {
            this.buffer.push(new Float32Array(data));
            this.size += data.length;
        }
        , compress: function () { //合并压缩
            //合并
            var data = new Float32Array(this.size);
            var offset = 0;
            for (var i = 0; i < this.buffer.length; i++) {
                data.set(this.buffer[i], offset);
                offset += this.buffer[i].length;
            }
            //压缩
            var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
            var length = data.length / compression;
            var result = new Float32Array(length);
            var index = 0, j = 0;
            while (index < length) {
                result[index] = data[j];
                j += compression;
                index++;
            }
            return result;
        }
        , encodeWAV: function () {
            var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
            var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
            var bytes = this.compress();
            var dataLength = bytes.length * (sampleBits / 8);
            var buffer = new ArrayBuffer(44 + dataLength);
            var data = new DataView(buffer);
 
            var channelCount = 1;//单声道
            var offset = 0;
 
            var writeString = function (str) {
                for (var i = 0; i < str.length; i++) {
                    data.setUint8(offset + i, str.charCodeAt(i));
                }
            };
 
            // 资源交换文件标识符
            writeString(‘RIFF’); offset += 4;
            // 下个地址开始到文件尾总字节数,即文件大小-8
            data.setUint32(offset, 36 + dataLength, true); offset += 4;
            // WAV文件标志
            writeString(‘WAVE’); offset += 4;
            // 波形格式标志
            writeString(‘fmt ‘); offset += 4;
            // 过滤字节,一般为 0x10 = 16
            data.setUint32(offset, 16, true); offset += 4;
            // 格式类别 (PCM形式采样数据)
            data.setUint16(offset, 1, true); offset += 2;
            // 通道数
            data.setUint16(offset, channelCount, true); offset += 2;
            // 采样率,每秒样本数,表示每个通道的播放速度
            data.setUint32(offset, sampleRate, true); offset += 4;
            // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
            data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
            // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
            data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
            // 每样本数据位数
            data.setUint16(offset, sampleBits, true); offset += 2;
            // 数据标识符
            writeString(‘data’); offset += 4;
            // 采样数据总数,即数据总大小-44
            data.setUint32(offset, dataLength, true); offset += 4;
            // 写入采样数据
            if (sampleBits === 8) {
                for (var i = 0; i < bytes.length; i++, offset++) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
                    val = parseInt(255 / (65535 / (val + 32768)));
                    data.setInt8(offset, val, true);
                }
            } else {
                for (var i = 0; i < bytes.length; i++, offset += 2) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
                }
            }
 
            return new Blob([data], { type: ‘audio/wav’ });
        }
    };
 
    this.start = function () {
        audioInput.connect(recorder);
        recorder.connect(context.destination);
    }
 
    this.stop = function () {
        recorder.disconnect();
    }
 
    this.getBlob = function () {
        return audioData.encodeWAV();
    }
 
    this.clear = function() {
        audioData.clear();
    }
 
    recorder.onaudioprocess = function (e) {
        audioData.input(e.inputBuffer.getChannelData(0));
    }
};
 
SRecorder.get = function (callback) {
    if (callback) {
        if (navigator.getUserMedia) {
            navigator.getUserMedia(
                { audio: true },
                function (stream) {
                    var rec = new SRecorder(stream);
                    callback(rec);
                })
        }
    }
}
 
function receive(e) {
    audio.src = window.URL.createObjectURL(e);
}
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var a = document.getElementById(‘a’);
var b = document.getElementById(‘b’);
var c = document.getElementById(‘c’);
 
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia;
 
var gRecorder = null;
var audio = document.querySelector(‘audio’);
var door = false;
var ws = null;
 
b.onclick = function() {
    if(a.value === ”) {
        alert(‘请输入用户名’);
        return false;
    }
    if(!navigator.getUserMedia) {
        alert(‘抱歉您的设备无法语音聊天’);
        return false;
    }
 
    SRecorder.get(function (rec) {
        gRecorder = rec;
    });
 
    ws = new WebSocket("wss://x.x.x.x:8888");
 
    ws.onopen = function() {
        console.log(‘握手成功’);
        ws.send(‘user:’ + a.value);
    };
 
    ws.onmessage = function(e) {
        receive(e.data);
    };
 
    document.onkeydown = function(e) {
        if(e.keyCode === 65) {
            if(!door) {
                gRecorder.start();
                door = true;
            }
        }
    };
 
    document.onkeyup = function(e) {
        if(e.keyCode === 65) {
            if(door) {
                ws.send(gRecorder.getBlob());
                gRecorder.clear();
                gRecorder.stop();
                door = false;
            }
        }
    }
}
 
c.onclick = function() {
    if(ws) {
        ws.close();
    }
}
 
var SRecorder = function(stream) {
    config = {};
 
    config.sampleBits = config.smapleBits || 8;
    config.sampleRate = config.sampleRate || (44100 / 6);
 
    var context = new AudioContext();
    var audioInput = context.createMediaStreamSource(stream);
    var recorder = context.createScriptProcessor(4096, 1, 1);
 
    var audioData = {
        size: 0          //录音文件长度
        , buffer: []     //录音缓存
        , inputSampleRate: context.sampleRate    //输入采样率
        , inputSampleBits: 16       //输入采样数位 8, 16
        , outputSampleRate: config.sampleRate    //输出采样率
        , oututSampleBits: config.sampleBits       //输出采样数位 8, 16
        , clear: function() {
            this.buffer = [];
            this.size = 0;
        }
        , input: function (data) {
            this.buffer.push(new Float32Array(data));
            this.size += data.length;
        }
        , compress: function () { //合并压缩
            //合并
            var data = new Float32Array(this.size);
            var offset = 0;
            for (var i = 0; i < this.buffer.length; i++) {
                data.set(this.buffer[i], offset);
                offset += this.buffer[i].length;
            }
            //压缩
            var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
            var length = data.length / compression;
            var result = new Float32Array(length);
            var index = 0, j = 0;
            while (index < length) {
                result[index] = data[j];
                j += compression;
                index++;
            }
            return result;
        }
        , encodeWAV: function () {
            var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
            var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
            var bytes = this.compress();
            var dataLength = bytes.length * (sampleBits / 8);
            var buffer = new ArrayBuffer(44 + dataLength);
            var data = new DataView(buffer);
 
            var channelCount = 1;//单声道
            var offset = 0;
 
            var writeString = function (str) {
                for (var i = 0; i < str.length; i++) {
                    data.setUint8(offset + i, str.charCodeAt(i));
                }
            };
 
            // 资源交换文件标识符
            writeString(‘RIFF’); offset += 4;
            // 下个地址开始到文件尾总字节数,即文件大小-8
            data.setUint32(offset, 36 + dataLength, true); offset += 4;
            // WAV文件标志
            writeString(‘WAVE’); offset += 4;
            // 波形格式标志
            writeString(‘fmt ‘); offset += 4;
            // 过滤字节,一般为 0x10 = 16
            data.setUint32(offset, 16, true); offset += 4;
            // 格式类别 (PCM形式采样数据)
            data.setUint16(offset, 1, true); offset += 2;
            // 通道数
            data.setUint16(offset, channelCount, true); offset += 2;
            // 采样率,每秒样本数,表示每个通道的播放速度
            data.setUint32(offset, sampleRate, true); offset += 4;
            // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
            data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
            // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
            data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
            // 每样本数据位数
            data.setUint16(offset, sampleBits, true); offset += 2;
            // 数据标识符
            writeString(‘data’); offset += 4;
            // 采样数据总数,即数据总大小-44
            data.setUint32(offset, dataLength, true); offset += 4;
            // 写入采样数据
            if (sampleBits === 8) {
                for (var i = 0; i < bytes.length; i++, offset++) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
                    val = parseInt(255 / (65535 / (val + 32768)));
                    data.setInt8(offset, val, true);
                }
            } else {
                for (var i = 0; i < bytes.length; i++, offset += 2) {
                    var s = Math.max(-1, Math.min(1, bytes[i]));
                    data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
                }
            }
 
            return new Blob([data], { type: ‘audio/wav’ });
        }
    };
 
    this.start = function () {
        audioInput.connect(recorder);
        recorder.connect(context.destination);
    }
 
    this.stop = function () {
        recorder.disconnect();
    }
 
    this.getBlob = function () {
        return audioData.encodeWAV();
    }
 
    this.clear = function() {
        audioData.clear();
    }
 
    recorder.onaudioprocess = function (e) {
        audioData.input(e.inputBuffer.getChannelData(0));
    }
};
 
SRecorder.get = function (callback) {
    if (callback) {
        if (navigator.getUserMedia) {
            navigator.getUserMedia(
                { audio: true },
                function (stream) {
                    var rec = new SRecorder(stream);
                    callback(rec);
                })
        }
    }
}
 
function receive(e) {
    audio.src = window.URL.createObjectURL(e);
}

注意:按住a键说话,放开a键发送

注意:按住a键说话,放开a键发送

注意:按住a键说话,放开a键发送

友好有尝试不按键实时对讲,通过setInterval发送,但发现杂音有点重,效果糟糕,那一个必要encodeWAV再一层的卷入,多去除环境杂音的职能,自己挑选了越来越方便的按键说话的形式

友善有尝试不按键实时对讲,通过setInterval发送,但发现杂音有点重,效果不佳,那么些要求encodeWAV再一层的包装,多去除环境杂音的效益,自己挑选了越来越便利的按键说话的形式

协调有尝试不按键实时对讲,通过setInterval发送,但发现杂音有点重,效果不好,那些须求encodeWAV再一层的包裹,多去除环境杂音的职能,自己挑选了进一步便民的按键说话的格局

 

 

 

这篇作品里首先展望了websocket的前景,然后依照规范大家友好尝试解析和转移数据帧,对websocket有了更深一步的刺探

那篇作品里首先展望了websocket的前程,然后根据专业大家团结一心尝尝解析和扭转数据帧,对websocket有了更深一步的打听

那篇小说里第一展望了websocket的以后,然后根据专业大家自己尝试解析和浮动数据帧,对websocket有了更深一步的问询

最后通过几个demo看到了websocket的潜力,关于语音聊天室的demo涉及的较广,没有接触过奥迪(Audi)oContext对象的校友最好先精通下奥迪oContext

末段经过多少个demo看到了websocket的潜力,关于语音聊天室的demo涉及的较广,没有接触过奥迪(Audi)oContext对象的同窗最好先明白下奥迪(Audi)oContext

终极通过八个demo看到了websocket的潜力,关于语音聊天室的demo涉及的较广,没有接触过奥迪(Audi)oContext对象的同室最好先了然下奥迪oContext

作品到此地就终止啦~有哪些想法和难点欢迎大家提议来一起座谈探索~

小说到此处就终止啦~有哪些想法和题材欢迎大家提议来一起谈论探索~

小说到那里就终止啦~有哪些想法和题材欢迎我们指出来一起谈谈探索~

 

 

 

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