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Transfer sensor data via WebRTC #1

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Transfer sensor data via WebRTC #1

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59aff97
Start porting communication to WebRTC
ansgarprause Mar 6, 2024
33b4dc6
Move point based on received angles
ansgarprause Mar 6, 2024
45489aa
Clean up
ansgarprause Mar 6, 2024
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106 changes: 50 additions & 56 deletions public/controller.html
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Original file line number Diff line number Diff line change
@@ -1,60 +1,54 @@
<html>

<head>
<title>Mobile Laser Pointer - Controller</title>
</head>

<body>
<script type="module">
function toEuler(q) {
let sinr_cosp = 2 * (q[3] * q[0] + q[1] * q[2]);
let cosr_cosp = 1 - 2 * (q[0] * q[0] + q[1] * q[1]);
let roll = Math.atan2(sinr_cosp, cosr_cosp);

let siny_cosp = 2 * (q[3] * q[2] + q[0] * q[1]);
let cosy_cosp = 1 - 2 * (q[1] * q[1] + q[2] * q[2]);
let yaw = Math.atan2(siny_cosp, cosy_cosp);

return [yaw, roll];
}

const options = { frequency: 10, referenceFrame: "device" };
const sensor = new RelativeOrientationSensor(options);

const scheme = location.protocol === "https:" ? "wss" : "ws"
const ws = new WebSocket(`${scheme}://${location.host}/`);
await new Promise((res) => {
ws.addEventListener("open", (event) => {
res()
});
})

const factor = 50;
let firstRead;
sensor.addEventListener("reading", (e) => {
const [yaw, roll] = toEuler(e.target.quaternion);
if (!firstRead) {
firstRead = { yaw, roll };
<head>
<title>Mobile Laser Pointer - Controller</title>
</head>

<body>
<script type="module">
import { pageReady, start } from "./webrtc.js";
await pageReady();
const dataChannel = await start(true);

function toEuler(q) {
let sinr_cosp = 2 * (q[3] * q[0] + q[1] * q[2]);
let cosr_cosp = 1 - 2 * (q[0] * q[0] + q[1] * q[1]);
let roll = Math.atan2(sinr_cosp, cosr_cosp);

let siny_cosp = 2 * (q[3] * q[2] + q[0] * q[1]);
let cosy_cosp = 1 - 2 * (q[1] * q[1] + q[2] * q[2]);
let yaw = Math.atan2(siny_cosp, cosy_cosp);

return [yaw, roll];
}
const deltaYaw = firstRead.yaw - yaw;
const deltaRoll = firstRead.roll - roll;

ws.send(JSON.stringify({ deltaYaw, deltaRoll }))

console.log({
yaw: yaw.toFixed(4),
deltaYaw: deltaYaw.toFixed(4),
roll: roll.toFixed(4),
deltaRoll: deltaRoll.toFixed(4),
const options = { frequency: 30, referenceFrame: "device" };
const sensor = new AbsoluteOrientationSensor(options);

let firstRead;
sensor.addEventListener("reading", (e) => {
const [yaw, roll] = toEuler(e.target.quaternion);
if (!firstRead) {
firstRead = { yaw, roll };
}
const deltaYaw = firstRead.yaw - yaw;
const deltaRoll = firstRead.roll - roll;
console.log("reading", [deltaYaw, deltaRoll]);

dataChannel.send(JSON.stringify({ deltaYaw, deltaRoll }));

console.log({
yaw: yaw.toFixed(4),
deltaYaw: deltaYaw.toFixed(4),
roll: roll.toFixed(4),
deltaRoll: deltaRoll.toFixed(4),
});
});
});
sensor.addEventListener("error", (error) => {
if (event.error.name === "NotReadableError") {
console.log("Sensor is not available.");
}
});
sensor.start();
</script>
</body>

</html>
sensor.addEventListener("error", (error) => {
if (event.error.name === "NotReadableError") {
console.log("Sensor is not available.");
}
});
sensor.start();
</script>
</body>
</html>
43 changes: 18 additions & 25 deletions public/display.html
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Original file line number Diff line number Diff line change
@@ -1,30 +1,23 @@
<html>
<head>
<title>Mobile Laser Pointer - Display</title>
</head>

<head>
<title>Mobile Laser Pointer - Display</title>
</head>
<body style="margin: 0">
<svg style="width: 100vw; height: 100vh" viewBox="0 0 100 100">
<circle id="circle" r="10" fill="red" cx="50" cy="50" />
</svg>

<body style="margin: 0">
<svg style="width: 100vw; height: 100vh" viewBox="0 0 100 100">
<circle id="circle" r="10" fill="red" cx="50" cy="50" />
</svg>
<script type="module">
import { pageReady } from "./webrtc.js";
// TODO: get data channel or pass callback
await pageReady();

<script type="module">
const point = document.getElementById("circle");
const factor = 50;
const point = document.getElementById("circle");
const factor = 50;

const scheme = location.protocol === "https:" ? "wss" : "ws"
const ws = new WebSocket(`${scheme}://${location.host}/`);
ws.addEventListener("open", () => {
console.log("socket open")
ws.addEventListener("message", (ev) => {
const { deltaYaw, deltaRoll } = JSON.parse(ev.data);

point.setAttributeNS(null, "cx", 50 + factor * deltaYaw);
point.setAttributeNS(null, "cy", 50 + factor * deltaRoll);
})
})
</script>
</body>

</html>
// point.setAttributeNS(null, "cx", 50 + factor * deltaYaw);
// point.setAttributeNS(null, "cy", 50 + factor * deltaRoll);
</script>
</body>
</html>
108 changes: 108 additions & 0 deletions public/webrtc.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,108 @@
let peerConnection;
let uuid;
let ws;

const peerConnectionConfig = {
iceServers: [
{ urls: "stun:stun.stunprotocol.org:3478" },
{ urls: "stun:stun.l.google.com:19302" },
],
};

export const pageReady = () => {
console.log("page ready");

uuid = createUUID();

const scheme = location.protocol === "https:" ? "wss" : "ws";
ws = new WebSocket(`${scheme}://${location.host}`);

return new Promise((resolve) => {
ws.addEventListener("open", () => {
resolve();
console.log("socket open");
ws.addEventListener("message", async (message) => {
if (!peerConnection) {
start(false);
}

const signal = JSON.parse(message.data);

if (signal.uuid === uuid) {
return;
}

if (signal.sdp) {
await peerConnection.setRemoteDescription(
new RTCSessionDescription(signal.sdp)
);
if (signal.sdp.type === "offer") {
const description = await peerConnection.createAnswer();
createdDescription(description, ws);
}
} else if (signal.ice) {
await peerConnection.addIceCandidate(new RTCIceCandidate(signal.ice));
}
});
});
});
};

export const start = async (isCaller) => {
peerConnection = new RTCPeerConnection(peerConnectionConfig);

peerConnection.addEventListener("icecandidate", (event) => {
console.log("icecandidate");
if (event.candidate != null) {
ws.send(JSON.stringify({ ice: event.candidate, uuid: uuid }));
}
});

if (isCaller) {
const dataChannel = peerConnection.createDataChannel("angles");

return new Promise(async (resolve) => {
dataChannel.addEventListener("open", () => {
console.log("data channel open");
resolve(dataChannel);
});

const description = await peerConnection.createOffer();
createdDescription(description, ws);
});
} else {
peerConnection.addEventListener("datachannel", (event) => {
event.channel.addEventListener("message", (event) => {
console.log("data channel message", event.data);

const { deltaYaw, deltaRoll } = JSON.parse(event.data);

const point = document.getElementById("circle");
const factor = 50;

point.setAttributeNS(null, "cx", 50 + factor * deltaYaw);
point.setAttributeNS(null, "cy", 50 + factor * deltaRoll);
});
});
}
};

const createdDescription = async (description, ws) => {
await peerConnection.setLocalDescription(description);
ws.send(
JSON.stringify({
sdp: peerConnection.localDescription,
uuid: uuid,
})
);
};

function createUUID() {
function s4() {
return Math.floor((1 + Math.random()) * 0x10000)
.toString(16)
.substring(1);
}

return `${s4() + s4()}-${s4()}-${s4()}-${s4()}-${s4() + s4() + s4()}`;
}