cf.html

<meta name="viewport" content="width=device-width, initial-scale=1.0">
<input id="server" value="https://0xffff.zk524gg.workers.dev" />
<input id="source" type="file" />
<button id="open">Open</button>
<button id="stop">Stop</button>
<button id="upload" disabled>SourceImage</button><br>
<video id="real" autoplay></video>
<video id="fake" autoplay></video>
<script>
    const DID = _ => document.getElementById(_)
    document.head.append(Object.assign(document.createElement('style'), { textContent: `video{width:100%;height:auto} #source{display:none}` }))
    DID("open").onclick = () => navigator.mediaDevices.getUserMedia({ video: true, audio: false }).then(async stream => {
        const pc = new RTCPeerConnection({ iceServers: [{ urls: "stun:stun.l.google.com:19302" }] })
        let params = { candidates: [] }
        let timer
        (DID("real").srcObject = stream).getTracks().forEach(_ => pc.addTrack(_, stream))
        await pc.setLocalDescription(await pc.createOffer())
        params.sdp = pc.localDescription.sdp
        pc.ontrack = (event) => DID("fake").srcObject = event.streams[0]
        pc.onicecandidate = ({ candidate }) => {
            if (candidate) {
                clearTimeout(timer)
                params.candidates.push(candidate)
                timer = setTimeout(() => {
                    socket = new WebSocket((_ => (_.protocol = _.protocol === "https:" ? "wss" : "ws", _.pathname = "ws", _.href))(new URL(DID("server").value)))
                    socket.onmessage = (e) => e.data.length > 10 ? pc.setRemoteDescription(new RTCSessionDescription(JSON.parse(e.data))) : console.log(e.data)
                    socket.onopen = () => socket.send(JSON.stringify(params))
                }, 1000)
            }
        }
        DID("stop").onclick = () => (pc.close(), ["real", "fake"].forEach(_ => (DID(_).srcObject?.getTracks()?.forEach(_ => _.stop()), DID(_).srcObject = null)))
    })
    DID("upload").onclick = () => DID("source").click()
    DID("source").addEventListener("change", ({ target: { files: [file] } }) => {
        const reader = new FileReader()
        reader.onload = (e) => fetch(DID("server").value + "/src", { method: "POST", body: e.target.result }).then(_ => _.json()).then(({ status }) => alert(status))
        reader.readAsArrayBuffer(file)
        DID("source").value = ""
    })
</script>