要实现websocket对讲机功能，首先要编写一个html，代码如下：
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<title>test</title>
</head>
<body>
<div>
<button id="intercomBegin">开始对讲</button>
<button id="intercomEnd">关闭对讲</button>
<audio id="playsoud"></audio>
</div>
</body>
<script>
var begin = document.getElementById('intercomBegin');
var end = document.getElementById('intercomEnd');
var audo = document.getElementById('playsoud');
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia;
var ws = null;//实现WebSocket
var record=null;//多媒体对象，用来处理音频
var timeInte = null;//定义一个定时器
begin.onclick = function() {
console.log('开始对讲')
}
end.onclick = function() {
console.log('关闭对讲')
if(ws) {
ws.close();
record.stop();
clearInterval(timeInte);
}
}
function init(rec){
record = rec;
}
if (!navigator.getUserMedia) {
alert('浏览器不支持音频输入');
}else{
navigator.getUserMedia(
{ audio: true },
function (mediaStream) {
init(new Recorder(mediaStream));
},function(error){
console.log(error)
}
)
}
//录音对象
var Recorder = function(stream) {
var sampleBits = 16;//输出采样数位 8, 16
var sampleRate = 8000;//输出采样率
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: 48000 //输入采样率
, inputSampleBits: 16 //输入采样数位 8, 16
, outputSampleRate: sampleRate
, oututSampleBits: sampleBits
, 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;
}, encodePCM: function(){//这里不对采集到的数据进行其他格式处理，如有需要均交给服务器端处理。
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(dataLength);
var data = new DataView(buffer);
var offset = 0;
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]);
}
};
this.start = function () {
audioInput.connect(recorder);
recorder.connect(context.destination);
}
this.stop = function () {
recorder.disconnect();
}
this.getBlob = function () {
return audioData.encodePCM();
}
this.clear = function() {
audioData.clear();
}
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0));
}
};
function receive(data) {
if( typeof e == 'string' && JSON.parse(e).message=='OK'){
console.log('OK');
}else{
var buffer = (new Response(data)).arrayBuffer();
buffer.then(function(buf){
console.log("################recv start ####################################");
var audioContext = new ( window.AudioContext || window.webkitAudioContext )();
var fileResult =addWavHeader(buf, '8000', '16', '1');//解析数据转码wav
audioContext.decodeAudioData(fileResult, function(buffer) {
_visualize(audioContext,buffer);//播放
});
console.log("################recv end ####################################");
});
}
}
//处理音频流，转码wav
var addWavHeader = function(samples,sampleRateTmp,sampleBits,channelCount){
var dataLength = samples.byteLength;
var buffer = new ArrayBuffer(44 + dataLength);
var view = new DataView(buffer);
function writeString(view, offset, string){
for (var i = 0; i < string.length; i++){
view.setUint8(offset + i, string.charCodeAt(i));
}
}
var offset = 0;
/* 资源交换文件标识符 */
writeString(view, offset, 'RIFF'); offset += 4;
/* 下个地址开始到文件尾总字节数,即文件大小-8 */
view.setUint32(offset, /*32*/ 36 + dataLength, true); offset += 4;
/* WAV文件标志 */
writeString(view, offset, 'WAVE'); offset += 4;
/* 波形格式标志 */
writeString(view, offset, 'fmt '); offset += 4;
/* 过滤字节,一般为 0x10 = 16 */
view.setUint32(offset, 16, true); offset += 4;
/* 格式类别 (PCM形式采样数据) */
view.setUint16(offset, 1, true); offset += 2;
/* 通道数 */
view.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 */
view.setUint32(offset, sampleRateTmp, true); offset += 4;
/* 波形数据传输率 (每秒平均字节数) 通道数×每秒数据位数×每样本数据位/8 */
view.setUint32(offset, sampleRateTmp * channelCount * (sampleBits / 8), true); offset +=4;
/* 快数据调整数 采样一次占用字节数 通道数×每样本的数据位数/8 */
view.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
/* 每样本数据位数 */
view.setUint16(offset, sampleBits, true); offset += 2;
/* 数据标识符 */
writeString(view, offset, 'data'); offset += 4;
/* 采样数据总数,即数据总大小-44 */
view.setUint32(offset, dataLength, true); offset += 4;
function floatTo32BitPCM(output, offset, input){
input = new Int32Array(input);
for (var i = 0; i < input.length; i++, offset+=4){
output.setInt32(offset,input[i],true);
}
}
function floatTo16BitPCM(output, offset, input){
input = new Int16Array(input);
for (var i = 0; i < input.length; i++, offset+=2){
output.setInt16(offset,input[i],true);
}
}
function floatTo8BitPCM(output, offset, input){
input = new Int8Array(input);
for (var i = 0; i < input.length; i++, offset++){
output.setInt8(offset,input[i],true);
}
}
if(sampleBits == 16){
floatTo16BitPCM(view, 44, samples);
}else if(sampleBits == 8){
floatTo8BitPCM(view, 44, samples);
}else{
floatTo32BitPCM(view, 44, samples);
}
return view.buffer;
}
//播放音频
var _visualize = function(audioContext, buffer) {
var audioBufferSouceNode = audioContext.createBufferSource(),
analyser = audioContext.createAnalyser(),
that = this;
//将信号源连接到分析仪
audioBufferSouceNode.connect(analyser);
//将分析仪连接到目的地（扬声器），否则我们将听不到声音
analyser.connect(audioContext.destination);
//然后将缓冲区分配给缓冲区源节点
audioBufferSouceNode.buffer = buffer;
//发挥作用
if (!audioBufferSouceNode.start) {
audioBufferSouceNode.start = audioBufferSouceNode.noteOn //在旧浏览器中使用noteOn方法
audioBufferSouceNode.stop = audioBufferSouceNode.noteOff //在旧浏览器中使用noteOff方法
};
//如果有的话，停止前一个声音
if (this.animationId !== null) {
cancelAnimationFrame(this.animationId);
}
audioBufferSouceNode.start(0);
audo.source = audioBufferSouceNode;
audo.audioContext = audioContext;
}
begin.onclick = function() {
var ws = new WebSocket("wss:/web.debug.only.bfw.wiki:9502/websocket");
ws.binaryType = 'arraybuffer'; //传输的是 ArrayBuffer 类型的数据
ws.onopen = function(event) {
console.log('握手成功');
//业务命令构建
};
timeInte=setInterval(function(){
if(ws.readyState==1){//ws进入连接状态，则每隔500毫秒发送一包数据
record.start();
console.log("#######################send Blob start ##############################");
// console.log(record.getBlob());
ws.send(record.getBlob()); //发送音频数据
console.log("#######################send Blob end ##############################");
record.clear(); //每次发送完成则清理掉旧数据
}
},500); //每隔500ms发送一次，定时器
///
ws.onmessage = function (evt){
console.log( "Received Message: " + evt.data);
receive(evt.data);
}
///
}
</script>
</html>
接下去是websocket服务端，这里采用swoole实现。
<?php
$userlist = [];
$server = new Swoole\Websocket\Server("0.0.0.0", 9502, SWOOLE_PROCESS, SWOOLE_SOCK_TCP | SWOOLE_SSL);
$server->set([
'ssl_cert_file' => '/data/cert/4504571_web.debug.only.bfw.wiki.pem',
'ssl_key_file' => '/data/cert/4504571_web.debug.only.bfw.wiki.key',
]);
$server->on('open', function($server, $req) {
global $userlist;
$userlist[] = $req->fd;
});
$server->on('message', function($server, $frame) {
echo("rec \n");
global $userlist;
//var_dump($userlist);
foreach ($userlist as $key) {
if ($key != $frame->fd) {
echo("send {$key}\n");
$server->push($key, $frame->data, SWOOLE_WEBSOCKET_OPCODE_BINARY);
}
}
// echo "received message: {$frame->data}\n";
});
$server->on('close', function($server, $fd) {
echo "connection close: {$fd}\n";
});
$server->start();
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