webRTC（十二）：webrtc 传输速率控制
- 设置传输速率的值
<div>
<label>BandWidth:label>
<select id="bandwidth" disabled>
<option value="unlimited" selected>unlimitedoption>
<option value="2000">2000option>
<option value="1000">1000option>
<option value="500">500option>
<option value="250">250option>
<option value="125">125option>
select>
kps
div>
- 传输速率控制
//控制传输速率
function chang_bw(){
optBw.disabled =true;
var bw = optBw.options[optBw.selectedIndex].value;
var vsender = null;
var senders = pc.getSenders();
senders.forEach(sender=>{
if(sender&&sender.track && sender.track.kind === 'video'){
vsender = sender;
}
});
var parameters= vsender.getParameters();
if(!parameters.encodings){
return;
}
if(bw === 'unlimited'){
return;
}
parameters.encodings[0].maxBitrate = bw * 1000;
vsender.setParameters(parameters)
.then(()=>{
optBw.disabled =false;
console.log('Successed to set parameters!');
})
.catch(err=>{
console.error(err);
})
}
- 效果
源码
- html
<html>
<head>
<title>WebRTC PeerConnectiontitle>
<style>
.preview{
display: flex;
}
.remote{
margin-left: 20px;
}
style>
head>
<body>
<div>
<div>
<button id="connserver">Connect Sig Serverbutton>
<button id="leave" disabled>Leavebutton>
div>
<div>
<label>BandWidth:label>
<select id="bandwidth" disabled>
<option value="unlimited" selected>unlimitedoption>
<option value="2000">2000option>
<option value="1000">1000option>
<option value="500">500option>
<option value="250">250option>
<option value="125">125option>
select>
kps
div>
<div class="preview">
<div>
<h2>Local:h2>
<video id="localvideo" autoplay playsinline>video>
div>
<div class="remote">
<h2>Remote:h2>
<video id="remotevideo" autoplay playsinline>video>
div>
div>
div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js">script>
<script src="https://webrtc.github.io/adapter/adapter-latest.js">script>
<script src="./js/main_bw.js">script>
body>
html>
- js
'use strict'
var localVideo = document.querySelector('video#localvideo');
var remoteVideo = document.querySelector('video#remotevideo');
var btnConn = document.querySelector('button#connserver');
var btnLeave = document.querySelector('button#leave');
var optBw = document.querySelector('select#bandwidth')
var localStream = null;
var roomid = '333333';
var socket =null;
var state = 'init';
var pc = null;
var pcConfig={
'iceServers':[{
'urls':'turn:121.41.76.43:3478',
'credential':'123456',
'username':'huang'
}]
}
function sendMessage(roomid,data){
if(socket){
socket.emit('message',roomid,data);
}
}
function getAnswer(desc){
pc.setLocalDescription(desc);
optBw.disabled =false;
sendMessage(roomid,desc);
}
function handleAnswerError(err){
console.error('Failed to get Answer!',err);
}
function getOffer(desc){
pc.setLocalDescription(desc);
sendMessage(roomid,desc)
}
function handleOfferError(err){
console.error('Failed to get Offer!',err);
}
//接收远端流通道
function call(){
if(state === 'joined_conn'){
if(pc){
var options = {
offerToReceiveAudio:1,
offerToReceiveVideo:1
}
pc.createOffer(options)
.then(getOffer)
.catch(handleOfferError);
}
}
}
// 第一步：开始服务
function connSignalServer(){
//开启本地视频
start();
return true;
}
function conn(){
//1 触发socke连接
socket = io.connect();
//2 加入房间后的回调
socket.on('joined',(roomid,id)=>{
state = 'joined';
createPeerConnection();
btnConn.disabled = true;
btnLeave.disabled =false;
console.log("reveive joined message:state=",state);
});
socket.on('otherjoin',(roomid,id)=>{
if (state === 'joined_unbind') {
createPeerConnection();
}
state = 'joined_conn';
//媒体协商
call();
console.log("reveive otherjoin message:state=",state);
});
socket.on('full',(roomid,id)=>{
console.log('receive full message ', roomid, id);
closePeerConnection();
closeLocalMedia();
state = 'leaved';
btnConn.disabled = false;
btnLeave.disabled = true;
console.log("reveive full message:state=",state);
alert("the room is full!");
});
socket.on('leaved',(roomid,id)=>{
state = 'leaved';
socket.disconnect();
btnConn.disabled = false;
btnLeave.disabled = true;
console.log("reveive leaved message:state=",state);
});
socket.on('bye',(roomid,id)=>{
state = 'joined_unbind';
closePeerConnection();
console.log("reveive bye message:state=",state);
});
socket.on('disconnect', (socket) => {
console.log('receive disconnect message!', roomid);
if(!(state === 'leaved')){
closePeerConnection();
closeLocalMedia();
}
state = 'leaved';
});
socket.on('message',(roomid,id,data)=>{
//媒体协商
if(data){
if(data.type === 'offer'){
pc.setRemoteDescription(new RTCSessionDescription(data));
pc.createAnswer()
.then(getAnswer)
.catch(handleAnswerError);
}else if(data.type === 'answer'){
console.log("reveive client message=====>",data);
optBw.disabled = false;
pc.setRemoteDescription(new RTCSessionDescription(data));
}else if(data.type === 'candidate'){
var candidate = new RTCIceCandidate({
sdpMLineIndex:data.label,
candidate:data.candidate
});
pc.addIceCandidate(candidate);
}else{
console.error('the message is invalid!',data)
}
}
console.log("reveive client message",roomid,id,data);
});
socket.emit('join',roomid);
return;
}
// 扑捉本地视频
function getMediaStream(stream){
localStream =stream;
//2 ===============显示本地视频===============
localVideo.srcObject = localStream;
//这个函数的调用时机特别重要 一定要在getMediaStream之后再调用，否则会出现绑定失败的情况
conn();
}
function handleError(err){
if(err){
console.error("getUserMedia error:",err);
}
}
// 第二步：采集本地视频
function start(){
if (!navigator.mediaDevices||
!navigator.mediaDevices.getUserMedia) {
console.log("getUserMedia is not supported!")
return;
} else {
//1 ===============配置音视频参数===============
var constraints={
video:true,
audio: false
}
navigator.mediaDevices.getUserMedia(constraints)
.then(getMediaStream)
.catch(handleError)
}
}
//关闭流通道
function closeLocalMedia(){
if (localStream&&localStream.getTracks()) {
localStream.getTracks().forEach((track)=>{
track.stop();
});
}
localStream = null;
}
function leave(){
if(socket){
socket.emit('leave',roomid);
}
//释放资源
closePeerConnection();
closeLocalMedia();
btnConn.disabled = false;
btnLeave.disabled = true;
}
//创建本地流媒体链接
function createPeerConnection(){
console.log('create RTCPeerConnection!');
if(!pc){
pc = new RTCPeerConnection(pcConfig);
pc.onicecandidate = (e) =>{
if(e.candidate){
sendMessage(roomid,{
type:'candidate',
label:e.candidate.sdpMLineIndex,
id:e.candidate.sdpMid,
candidate:e.candidate.candidate
});
}
}
pc.ontrack = (e)=>{
remoteVideo.srcObject = e.streams[0];
}
}
if(pc === null || pc === undefined){
console.error('pc is null or undefined!');
return;
}
if(localStream === null || localStream === undefined){
console.error('localStream is null or undefined!');
return;
}
if(localStream){
localStream.getTracks().forEach((track)=>{
pc.addTrack(track,localStream);
})
}
}
//关闭本地媒体流链接
function closePeerConnection(){
console.log('close RTCPeerConnection!');
if(pc){
pc.close();
pc = null;
}
}
//控制传输速率
function chang_bw(){
optBw.disabled =true;
var bw = optBw.options[optBw.selectedIndex].value;
var vsender = null;
var senders = pc.getSenders();
senders.forEach(sender=>{
if(sender&&sender.track && sender.track.kind === 'video'){
vsender = sender;
}
});
var parameters= vsender.getParameters();
if(!parameters.encodings){
return;
}
if(bw === 'unlimited'){
return;
}
parameters.encodings[0].maxBitrate = bw * 1000;
vsender.setParameters(parameters)
.then(()=>{
optBw.disabled =false;
console.log('Successed to set parameters!');
})
.catch(err=>{
console.error(err);
})
}
btnConn.onclick = connSignalServer;
btnLeave.onclick = leave;
optBw.onchange=chang_bw;
测试地址：https://www.huangxiaoguo.club/bandwidth/index.html