77 lines
2.3 KiB
JavaScript
77 lines
2.3 KiB
JavaScript
(async () => {
|
|
const globalConnnection = Symbol("grab-canvas-connection")
|
|
|
|
const currentScriptSrc = document.currentScript.src;
|
|
const sourceElt = document.querySelector("canvas,video");
|
|
console.log("Grabbing", sourceElt)
|
|
|
|
if(!sourceElt){
|
|
console.error("No canvas found on this page")
|
|
}
|
|
|
|
const conn = new RTCPeerConnection({
|
|
iceServers: [
|
|
{urls: ["stun:stun.nextcloud.com:443"]}
|
|
]
|
|
});
|
|
|
|
const iceCandidates = []
|
|
conn.addEventListener("icecandidate", e => {
|
|
iceCandidates.push(e.candidate)
|
|
})
|
|
|
|
const allCandidatesCollected = new Promise(res =>
|
|
conn.addEventListener("icecandidate", e => e.candidate == null && res() ))
|
|
|
|
let captureFn = sourceElt.captureStream;
|
|
if(!captureFn){
|
|
captureFn = sourceElt.mozCaptureStream;
|
|
}
|
|
|
|
if(sourceElt instanceof HTMLCanvasElement){
|
|
captureFn = sourceElt.captureStream.bind(sourceElt)
|
|
} else {
|
|
if(sourceElt.mozCaptureStream){
|
|
captureFn = sourceElt.mozCaptureStream.bind(sourceElt)
|
|
} else {
|
|
captureFn = sourceElt.captureStream.bind(sourceElt)
|
|
}
|
|
}
|
|
|
|
const canvasStream = captureFn()
|
|
const canvasStreamTracks = canvasStream.getVideoTracks()
|
|
if(canvasStreamTracks.length > 0){
|
|
conn.addTrack(canvasStreamTracks[0], canvasStream)
|
|
} else {
|
|
throw new Error("Element don't habe video track")
|
|
}
|
|
|
|
try {
|
|
const AudioContext = window.AudioContext || window.webkitAudioContext;
|
|
if(AudioContext){
|
|
const audioContext = new AudioContext();
|
|
audioContext.createMediaStreamSource(canvasStream)
|
|
.connect(audioContext.destination)
|
|
}
|
|
} catch(e){
|
|
console.warn(e)
|
|
}
|
|
|
|
const offer = await conn.createOffer();
|
|
await conn.setLocalDescription(offer);
|
|
|
|
await allCandidatesCollected
|
|
|
|
const res = await fetch(new URL("/_loled/grab-display", currentScriptSrc), {
|
|
method: "POST",
|
|
headers: { "content-type": "application/json" },
|
|
body: JSON.stringify({
|
|
offer,
|
|
iceCandidates
|
|
})
|
|
})
|
|
const response = new RTCSessionDescription(await res.json());
|
|
conn.setRemoteDescription(response);
|
|
|
|
window[globalConnnection] = conn
|
|
})() |