全球彩票平台_全球彩票注册平台|官网下载地址

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全球彩官网下载地址图片的能力

websocket探寻其与语音、图片的力量

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

原版的书文出处: AlloyTeam   

谈起websocket想比大家不会目生,假若目生的话也没提到,一句话归纳

“WebSocket protocol 是HTML5大器晚成种新的协商。它完毕了浏览器与服务器全双工通讯”

WebSocket相相比较古板那么些服务器推技能差不离好了太多,大家能够挥手向comet和长轮询那些本事说后会有期啦,庆幸大家生活在颇负HTML5的时日~

那篇文章大家将分三片段查究websocket

率先是websocket的大规模使用,其次是一丝一毫自个儿制作服务器端websocket,最终是最首要介绍利用websocket制作的七个demo,传输图片和在线语音聊天室,let’s go

黄金年代、websocket不足为奇用法

这里介绍二种自身认为大范围的websocket实现……(瞩目:本文创设在node上下文景况

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
    });
});

深信了然websocket的同窗不或者不知底socket.io,因为socket.io太盛名了,也很棒,它本人对逾期、握手等都做了管理。作者嫌疑那也是落到实处websocket使用最多的不二等秘书诀。socket.io最最最赏心悦指标有些就是高雅降级,当浏览器不匡助websocket时,它会在内部高雅降级为长轮询等,客商和开垦者是不供给关切具体落到实处的,很平价。

但是职业是有两面性的,socket.io因为它的周详也推动了坑的地点,最要害的便是肥壮,它的包装也给多少带动了非常多的报纸发表冗余,而且高雅降级那风流倜傥亮点,也陪伴浏览器规范化的张开逐级失去了宏大

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

在那地不是指责说socket.io倒霉,已经被淘汰了,而是不经常候大家也能够考虑部分任何的落实~

 

2、http模块

刚刚说了socket.io丰腴,那今后就来讲说便捷的,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);

异常的粗略的落到实处,其实socket.io内部对websocket也是那样达成的,但是后边帮大家封装了一些handle管理,这里大家也足以团结去丰硕,给出两张socket.io中的源码图

全球彩官网下载地址 1

全球彩官网下载地址 2

 

3、ws模块

末端有个例子会用到,这里就提一下,前面具体看~

 

二、本身完成风度翩翩套server端websocket

偏巧说了三种遍布的websocket完结格局,以往我们思想,对于开荒者来讲

websocket相对于古板http数据交互作用情势以来,扩张了服务器推送的风云,客户端选取到事件再扩充相应管理,开拓起来不同并非太大呀

那是因为那八个模块已经帮大家将多少帧深入解析那边的坑都填好了,第二有的我们将尝试本人制造一套简便的服务器端websocket模块

多谢次碳酸钴的研讨支持,本身在此处那部分只是简单说下,假如对此有意思味好奇的请百度【web本事商讨所】

和谐完成服务器端websocket首要有两点,贰个是采用net模块选取数据流,还会有多少个是对照官方的帧结构图分析数据,达成这两有的就早已到位了全数的底层专门的学业

首先给三个客商端发送websocket握手报文的抓包内容

客商端代码很简短

JavaScript

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

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

全球彩官网下载地址 3

劳动器端要针对性那么些key验证,便是讲key加上二个特定的字符串后做三次sha1运算,将其结果调换为base64送回来

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这些字符串,并做三次sha1运算,最终转变来Base64 key = crypto.createHash('sha1').update(key WS).digest('base64'); // 输出重返给客商端的多寡,那一个字段都以必须的 o.write('HTTP/1.1 101 Switching Protocolsrn'); o.write('Upgrade: websocketrn'); o.write('Connection: Upgradern'); // 那么些字段带上服务器管理后的KEY o.write('Sec-WebSocket-Accept: ' key 'rn'); // 输出空行,使HTTP头停止 o.write('rn'); } }); }).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 Protocolsrn');
o.write('Upgrade: websocketrn');
o.write('Connection: Upgradern');
// 这个字段带上服务器处理后的KEY
o.write('Sec-WebSocket-Accept: ' key 'rn');
// 输出空行,使HTTP头结束
o.write('rn');
}
});
}).listen(8888);

如此握手部分就已经到位了,后边就是多少帧深入解析与转换的活了

先看下官方提供的帧结构暗示图

全球彩官网下载地址 4

回顾介绍下

FIN为是或不是终止的标示

RubiconSV为留下空间,0

opcode标记数据类型,是还是不是分片,是还是不是二进制拆解分析,心跳包等等

提交一张opcode对应图

全球彩官网下载地址 5

MASK是还是不是采取掩码

Payload len和后边extend payload length表示数据长度,这几个是最费力的

PayloadLen唯有7位,换到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超大的数码,由此明显当数码长度小于或等于125时候它才作为数据长度的汇报,就算这些值为126,则时候背后的五个字节来积累数据长度,要是为127则用前边八个字节来存款和储蓄数据长度

全球彩官网下载地址,Masking-key掩码

下边贴出深入解析数据帧的代码

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;
}

然后是生成数据帧的

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]); }

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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]);
}

都以比照帧结构暗暗提示图上的去管理,在这里边不细讲,随笔重要在下部分,就算对那块感兴趣的话能够活动web技能商讨所~

 

三、websocket传输图片和websocket语音谈心室

正片环节到了,那篇小说最珍视的要么显得一下websocket的部分使用境况

1、传输图片

我们先思量传输图片的步子是如何,首先服务器收到到客商端央浼,然后读取图片文件,将二进制数据转载给客商端,顾客端如哪儿理?当然是使用FileReader对象了

先给顾客端代码

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.readAsDataU凯雷德L(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);
};

收受到信息,然后readAsDataU陆风X8L,直接将图片base64增添到页面中

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,这里十一分间接把opcode写死了为2,对于Binary Frame,这样顾客端选取到多少是不会尝试进行toString的,否则会报错~

代码很简单,在此边向咱们大饱眼福一下websocket传输图片的快慢怎么着

测验超级多张图片,总共8.24M

经常来讲静态能源服务器供给20s左右(服务器较远卡塔尔国

cdn需要2.8s左右

这我们的websocket格局吧??!

答案是相像必要20s左右,是或不是超级大失所望……速度就是慢在传输上,并非服务器读取图片,本机上肖似的图样能源,1s左右足以造成……那样看来数据流也无法冲破间距的限定提升传输速度

上面大家来看看websocket的另叁个用法~

 

用websocket搭建语音闲聊室

先来收拾一下口音闲聊室的功用

顾客走入频道随后从Mike风输入音频,然后发送给后台转载给频道里面包车型大巴其余人,其余人选取到音讯实行播放

看起来困难在五个地点,第二个是节奏的输入,第二是选择到数量流实行广播

先说音频的输入,这里运用了HTML5的getUserMedia方法,但是注意了,其生机勃勃法子上线是有平洲的,最后说,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;
        })
}

先是个参数是{audio: true},只启用音频,然后创制了三个SRecorder对象,后续的操作基本上都在这里个指标上实行。那个时候如若代码运维在本地的话浏览器应该晋升您是否启用Mike风输入,鲜明之后就开发银行了

接下去我们看下SRecorder构造函数是什么,给出重要的片段

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oContext是多少个节奏上下文对象,有做过声音过滤管理的同学应该知道“生龙活虎段音频到达扬声器进行广播从前,半路对其举办阻挠,于是我们就拿到了点子数据了,这么些拦截工作是由window.奥迪oContext来做的,大家富有对旋律的操作都基于那么些目的”,大家能够通过奥迪oContext创设分裂的奥迪oNode节点,然后加多滤镜播放极其的声响

录音原理相近,我们也必要走奥迪oContext,可是多了一步对Mike风音频输入的选取上,实际不是像现在管理音频一下用ajax需要音频的ArrayBuffer对象再decode,Mike风的选取要求用到createMediaStreamSource方法,注意那么些参数正是getUserMedia方法第2个参数的参数

而且createScriptProcessor方法,它官方的讲授是:

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

——————

归纳下便是这一个主意是运用JavaScript去管理音频搜集操作

终于到点子收罗了!胜利就在前面!

接下去让大家把话筒的输入和韵律采撷相连起来

JavaScript

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

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

context.destination官方表达如下

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

——————

context.destination重返代表在遇到中的音频的末尾指标地。

好,到了那儿,大家还索要叁个监听音频收罗的风云

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是三个目的,那么些是在英特网找的,小编就加了八个clear方法因为后边会用到,首要有特别encodeWAV方法十分的赞,旁人举行了数十次的韵律压缩和优化,这些最终会陪伴完整的代码一同贴出来

那儿全体顾客步入频道随后从迈克风输入音频环节就已经实现啦,下边就该是向服务器端发送音频流,稍稍有一点蛋疼的来了,刚才大家说了,websocket通过opcode差别能够表示回去的数目是文本依然二进制数据,而我们onaudioprocess中input进去的是数组,最后播放音响必要的是Blob,{type: ‘audio/wav’}的对象,这样我们就必须要在发送在此之前将数组转变到WAV的Blob,这时候就用到了上面说的encodeWAV方法

服务器犹如相当的轻松,只要转载就能够了

地点测量试验确实能够,只是天坑来了!将次第跑在服务器上时候调用getUserMedia方法提示笔者必需在一个安然无恙的意况,也正是索要https,那表示ws也必得换到wss……故此服务器代码就从未选择大家自身包裹的拉手、剖判和编码了,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);

代码依然非常的粗略的,使用https模块,然后用了开始说的ws模块,userMap是效仿的频道,只兑现转载的中坚职能

行使ws模块是因为它极其https完成wss实乃太平价了,和逻辑代码0冲突

https的搭建在这里边就不提了,首若是索要私钥、CSHaval证书签字和证件文件,感兴趣的同窗能够掌握下(但是不通晓的话在现网碰着也用持续getUserMedia……卡塔 尔(阿拉伯语:قطر‎

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('请输入顾客名'); return false; } if(!navigator.getUserMedia) { alert('抱歉您的配备无西班牙语音闲谈'); 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 , input萨姆pleRate: context.sampleRate //输入采集样板率 , input萨姆pleBits: 16 //输入采集样板数位 8, 16 , outputSampleRate: config.sampleRate //输出采集样板率 , oututSampleBits: config.sampleBits //输出采集样本数位 8, 16 , clear: function() { this.buffer = []; this.size = 0; } , input: function (data) { this.buffer.push(new Float32Array(data)); this.size = data.length; } , compress: function () { //归总压缩 //归并 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)); } }; // 能源调换文件标记符 writeString('奇骏IFF'); offset = 4; // 下个地方先导到文件尾总字节数,即文件大小-8 data.setUint32(offset, 36 dataLength, true); offset = 4; // WAV文件表明 writeString('WAVE'); offset = 4; // 波形格式标识 writeString('fmt '); offset = 4; // 过滤字节,平时为 0x10 = 16 data.setUint32(offset, 16, true); offset = 4; // 格式种类 (PCM方式采集样本数据) data.setUint16(offset, 1, true); offset = 2; // 通道数 data.setUint16(offset, channelCount, true); offset = 2; // 采集样本率,每秒样品数,表示每一个通道的播报速度 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; // 快数据调治数 采集样本一遍占用字节数 单声道×每样板的数量位数/8 data.setUint16(offset, channelCount * (sampleBits / 8), true); offset = 2; // 每样品数量位数 data.setUint16(offset, sampleBits, true); offset = 2; // 数据标志符 writeString('data'); offset = 4; // 采样数据总的数量,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

团结有尝试不按钮实时对讲,通过setInterval发送,但发现杂音有一点点重,效果不佳,这一个需求encodeWAV再风华正茂层的包装,多去除情状杂音的效果与利益,本身筛选了进一步方便人民群众的按钮说话的方式

 

那篇作品里第生龙活虎远望了websocket的前景,然后遵照标准我们友好尝尝深入分析和扭转数据帧,对websocket有了更加深一步的刺探

聊起底通过三个demo见到了websocket的潜在的力量,关于语音聊天室的demo涉及的较广,未有接触过奥迪(Audi卡塔 尔(阿拉伯语:قطر‎oContext对象的同窗最棒先明白下奥迪oContext

小说到那边就得了啦~有怎么着主见和主题素材招待大家提议来一齐座谈研究~

 

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全球彩官网下载地址 6

ubuntu下python2.76

windows python 2.79, chrome37 firefox35通过

代码是在外人(cddn有人提问)根底上改的, 首要改变了parsedata和sendmessage那2个函数.

改代码参考上边了这段文书档案. 首要是第5条, 发送的数额长度分别是 8bit和 16bit和 64 bit(即 127, 65535,和2^64-1)三种情景 

出殡和接到是平等的, 举例

1.长度小于125时(由于采纳126, 127用作标识位.)

  1. 数码长度在128-65525以内时, Payload Length位设为126, 前面额外使用16bit意味长度(后面包车型的士126不再是长度的生机勃勃某个)

3.数码长度在65526-2^64-1里头时, Payload Length位设为127, 后边额外使用64bit表示长度(前边的127不再是长度的风姿洒脱有的)

 

  1. Fin (bit 0): determines if this is the last frame in the message. This would be set to 1 on the end of a series of frames, or in a single-frame message, it would be set to 1 as it is both the first and last frame.
  2. RSV1, RSV2, RSV3 (bits 1-3): these three bits are reserved for websocket extensions, and should be 0 unless a specific extension requires the use of any of these bytes.
  3. Opcode (bits 4-7): these four bits deterimine the type of the frame. Control frames communicate WebSocket state, while non-control frames communicate data. The various types of codes include:

    1. x0: continuation frame; this frame contains data that should be appended to the previous frame
    2. x1: text frame; this frame (and any following) contains text
    3. x2: binary frame; this frame (and any following) contains binary data
    4. x3 - x7: non-control reserved frames; these are reserved for possible websocket extensions
    5. x8: close frame; this frame should end the connection
    6. x9: ping frame
    7. xA: pong frame
    8. xB - xF: control reserved frames
  4. Mask (bit 8): this bit determines whether this specific frame uses a mask or not.

  5. Payload Length (bits 9-15, or 16-31, or 16-79): these seven bytes determine the payload length. If the length is 126, the length is actually determined by bits 16 through 31 (that is, the following two bytes). If the length is 127, the length is actually determined by bits 16 through 79 (that is, the following eight bytes).
  6. Masking Key (the following four bytes): this represents the mask, if the Mask bit is set to 1.
  7. Payload Data (the following data): finally, the data. The payload data may be sent over multiple frames; we know the size of the entire message by the payload length that was sent, and can append data together to form a single message until we receive the message with the Fin flag. Each consecutive payload, if it exists, will contain the 0 “continuation frame” opcode.

 

 

 

服务器

 

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