[英]Getting images in second peer using WebRTC (without a server)
我正在創建一個方向呼叫,但無法在第二個對等方收到圖像。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WebRTC</title>
<style>
body,
html {
margin: 0;
padding: 0;
height: 100%;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
background-color: #20262E;
}
video {
width: 100%
}
</style>
</head>
<body>
<button id="initialize">initialize</button>
<video autoplay></video>
<script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>
<script src="carai.js"></script>
</body>
</html>
const startButton = document.querySelector('button#initialize')
const video = document.querySelector('video')
const confPeer = {}
const channel = new BroadcastChannel('loc')
const peer = new RTCPeerConnection(confPeer)
//
// SIMULATE WEBSOCKET
//
channel.addEventListener('message', message => {
let {
action,
value
} = message.data
switch (action) {
case 'offer':
startButton.remove()
answer(value)
break
case 'answer':
done(value)
break
default:
console.error('wtf')
}
})
//
// START CALL
//
const start = async () => {
console.log('----- start')
const localStream = await navigator.mediaDevices.getUserMedia({
// audio: true,
video: true
})
video.srcObject = localStream
localStream.getTracks().forEach(track => peer.addTrack(track, localStream));
let offer = await peer.createOffer()
peer.setLocalDescription(offer)
channel.postMessage({
action: 'offer',
value: JSON.stringify(offer)
})
}
//
// ANSWER CALL
//
const done = receivedAnswer => {
console.log('----- done')
peer.setRemoteDescription(JSON.parse(receivedAnswer))
}
//
// ESTABLISH CALL
//
const answer = async receivedOffer => {
console.log('----- answer')
peer.ontrack = e => {
console.log('----- ontrack', e)
video.srcObject = e.streams[0];
}
receivedOffer = JSON.parse(receivedOffer)
let desc = new RTCSessionDescription(receivedOffer)
peer.setRemoteDescription(desc)
let answer = await peer.createAnswer()
await peer.setLocalDescription(answer)
channel.postMessage({
action: 'answer',
value: JSON.stringify(answer)
})
}
//
// INITIALIZE
//
startButton.addEventListener('click', start)
調用方()將信息保存在localStorage中,被調用方()讀取並用來接受該調用,該調用接收getRemoteStreams,但是我不能在video元素中播放該信息。
誰能幫我這個?
這是我第一次使用WebRTC,我知道我缺少一些東西。
當我再次單擊“開始”按鈕時,它可以在Chrome中運行,但是會在終端中顯示以下折舊消息:
localStorage作為信令通道是演示兩個選項卡之間的調用的巧妙技巧。
但是您只完成了要約/答案交換的一半。 您需要將答案返回給呼叫者。 例如
localStorage.setItem('b', JSON.stringify(answer))
...然后添加接收該代碼的代碼,並在第一個對等設備上調用setRemoteDescription(answer)
。
您還需要交換ICE候選人,這使事情變得復雜。
FWIW我已經寫了localSocket helper類來幫助這個問題。 這是一個演示 (在2個選項卡中打開)。
最后, 不贊成使用 getRemoteStreams()
,因為您使用ontrack
所以這里ontrack
。
多虧了很棒的@jib,我才知道我做錯了什么。 這是傳遞給相同情況的正確代碼。
MUITO OBRIGADO @吉格
const startButton = document.querySelector('button#initialize')
const video = document.querySelector('video')
const confPeer = {}
const channel = new BroadcastChannel('loc')
const peer = new RTCPeerConnection(confPeer)
//
// SIMULATE WEBSOCKET
//
channel.addEventListener('message', message => {
let {
action,
value
} = message.data
switch (action) {
case 'offer':
startButton.remove()
answer(value)
break
case 'icecandidate':
icecandidate(value)
break
case 'answer':
done(value)
break
default:
console.error('wtf')
}
})
//
// PEER A: START CALL
//
const start = async () => {
console.log('----- start')
const localStream = await navigator.mediaDevices.getUserMedia({
// audio: true,
video: true
})
peer.onicecandidate = ev => {
console.log('candidate', ev.candidate)
channel.postMessage({
action: 'icecandidate',
value: JSON.stringify(ev.candidate)
})
}
video.srcObject = localStream
localStream.getTracks().forEach(track => peer.addTrack(track, localStream));
let offer = await peer.createOffer()
peer.setLocalDescription(offer)
channel.postMessage({
action: 'offer',
value: JSON.stringify(offer)
})
}
//
// PEER A: ANSWER CALL
//
const done = receivedAnswer => {
console.log('----- done')
peer.setRemoteDescription(JSON.parse(receivedAnswer))
}
//
// PEER B: ICE CANDIDATE
//
const icecandidate = receivedIcecandidate => {
let candidate = JSON.parse(receivedIcecandidate)
console.log('received icecandidate', candidate)
peer.addIceCandidate(candidate)
}
//
// PEER B: ESTABLISH CALL
//
const answer = async receivedOffer => {
console.log('----- answer')
peer.ontrack = e => {
console.log('----- ontrack', e)
video.srcObject = e.streams[0];
}
receivedOffer = JSON.parse(receivedOffer)
let desc = new RTCSessionDescription(receivedOffer)
peer.setRemoteDescription(desc)
let answer = await peer.createAnswer()
await peer.setLocalDescription(answer)
channel.postMessage({
action: 'answer',
value: JSON.stringify(answer)
})
}
//
// INITIALIZE
//
startButton.addEventListener('click', start)
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