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在阿里巴巴做网站整合营销策略

wzjs 2025/7/29 9:53:56

在阿里巴巴做网站,整合营销策略,中国购物平台排名,仿团购网站模板媒体能力协商过程 RTCPeerConnection（核心类） 基本格式 pc new RTCPeerConnection([configiration]); RTCPeerConnection方法分类媒体协商Stream/Track传输相关方法统计相关方法媒体协商过程协商状态变化媒体协商方法 createOffercreateAnswe…

媒体能力协商过程

RTCPeerConnection（核心类）

基本格式
pc = new RTCPeerConnection([configiration]);

RTCPeerConnection方法分类

媒体协商
Stream/Track
传输相关方法
统计相关方法

媒体协商过程

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协商状态变化

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媒体协商方法

createOffer
createAnswer
setLocalDescription
setRemoeteDescription

createOffer

基本格式
aPromise = myPeerConnection.createOffer([options]);

createAnswer

基本格式
aPromise = myPeerConnection.createAnswer([options]);

setLocalDescription

基本格式
aPromise = myPc.setLocalDescription(sessionDescription);

setRemoeteDescription

基本格式
aPromise = myPc.setRemoeteDescription(sessionDescription);

Track方法

addTrack
removeTrack

addTrack

基本格式
rtpSender = myPc.addTrack(track, stream…);
参数
track: 添加到RTCPeerConnection中的媒体轨
stream：指定track所在的stream

removeTrack

基本格式
myPc.removeTrack(rtpSender);

重要事件

onnegotiationneeded
onicecandidate

1:1连接的基本流程

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实战：本机内的1:1音视频互通

index.html

<html><head><title>WebRTC PeerConnection</title></head><body><div><video id="localvideo" autoplay playsinline></video><video id="remotevideo" autoplay playsinline></video><div><button id="start">Start</button><button id="call">Call</button><button id="hangup">HangUp</button></div></div><script src="https://webrtc.github.io/adapter/adapter-latest.js"></script><script src="js/main.js"></script></body>
</html>

main.js

'use strict'var localVideo = document.querySelector('video#localVideo');
var remoteVideo = document.querySelector('video#remoteVideo');
var btnStart = document.querySelector('button#start');
var btnCall = document.querySelector('button#call');
var btnHangUp= document.querySelector('button#hangup');var localStream;
var pc1;
var pc2;function gotMediaStream(stream){localVideo.srcObject = stream;localStream = stream;
}function handleError(err){console.log("Failed to call getUserMedia", err);
}function start(){var constraints = {video: true,audio: false }if(!navigator.mediaDevices ||!navigator.mediaDevices.getUserMedia){return;}else {navigator.mediaDevices.getUserMedia(constraints).then(gotMediaStream).catch(handleError);}}function gotAnswerDescription(desc){pc2.setLocalDescription(desc);//send sdp to caller//recieve sdp from calleepc1.setRemoteDescription(desc);}function gotLocalDescription(desc){pc1.setLocalDescription(desc);//send sdp to callee//receive sdp from caller pc2.setRemoteDescription(desc);	pc2.createAnswer().then(gotAnswerDescription).catch(handleError);
}function gotRemoteStream(e){if(remoteVideo.srcObject !== e.streams[0]){remoteVideo.srcObject = e.streams[0];}
}function call(){var offerOptions = {offerToReceiveAudio: 0,offerToReceiveVideo: 1 }pc1 = new RTCPeerConnection();pc1.onicecandidate = (e) => {// send candidate to peer// receive candidate from peerpc2.addIceCandidate(e.candidate).catch(handleError);console.log('pc1 ICE candidate:', e.candidate);}pc1.iceconnectionstatechange = (e) => {console.log(`pc1 ICE state: ${pc.iceConnectionState}`);console.log('ICE state change event: ', e);}pc2 = new RTCPeerConnection();pc2.onicecandidate = (e)=> {// send candidate to peer// receive candidate from peerpc1.addIceCandidate(e.candidate).catch(handleError);console.log('pc2 ICE candidate:', e.candidate);}pc2.iceconnectionstatechange = (e) => {console.log(`pc2 ICE state: ${pc.iceConnectionState}`);console.log('ICE state change event: ', e);}pc2.ontrack = gotRemoteStream;//add Stream to callerlocalStream.getTracks().forEach((track)=>{pc1.addTrack(track, localStream);});pc1.createOffer(offerOptions).then(gotLocalDescription).catch(handleError);}function hangup(){pc1.close();pc2.close();pc1 = null;pc2 = null;}btnStart.onclick = start;
btnCall.onclick = call;
btnHangUp.onclick = hangup;