598 lines
21 KiB
JavaScript
598 lines
21 KiB
JavaScript
const socket = io();
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const localVideo = document.getElementById('localVideo');
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const remoteVideo = document.getElementById('remoteVideo');
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const statusDiv = document.getElementById('status');
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const streamListUl = document.getElementById('streamList');
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const lobbyView = document.getElementById('lobby-view');
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const streamView = document.getElementById('stream-view');
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const streamTitle = document.getElementById('currentStreamTitle');
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const upstreamMetricsBox = document.getElementById('upstreamMetrics');
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const downstreamMetricsBox = document.getElementById('downstreamMetrics');
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// --- Global State ---
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let localStream = null;
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let iceServers = [];
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// ACTIVE connections
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let currentUpstreamPC = null;
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let currentDownstreamPC = null;
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let downstreamId = null;
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let origVideoStream,
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displayedVideoStream,
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sentVideoStream,
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origAudioStream,
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displayedAudioStream,
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sentAudioStream,
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origVideoTrack,
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origAudioTrack,
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displayedVideoTrack,
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displayedAudioTrack,
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sentVideoTrack,
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sentAudioTrack;
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// FADING connections
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let oldUpstreamPCs = [];
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let oldDownstreamPCs = [];
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// Debug metrics history for bitrate/fps deltas
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const metricsHistory = {
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upstream: null,
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downstream: null,
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};
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// --- 1. Initialization ---
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async function init() {
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try {
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const response = await fetch('/api/get-turn-credentials');
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const data = await response.json();
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console.log('TURN data:', data);
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iceServers = data.iceServers;
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} catch (e) {
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iceServers = [{ urls: 'stun:stun.l.google.com:19302' }];
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}
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}
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init();
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// --- 2. Lobby Logic ---
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// Receive list of streams from server
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socket.on('stream_list_update', (streams) => {
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streamListUl.innerHTML = '';
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if (streams.length === 0) {
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streamListUl.innerHTML = "<li style='cursor:default; color:#777;'>No active streams. Start one!</li>";
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return;
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}
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streams.forEach((name) => {
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const li = document.createElement('li');
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li.innerText = `${name}`;
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li.onclick = () => joinStream(name);
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streamListUl.appendChild(li);
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});
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});
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async function startStream() {
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const name = document.getElementById('streamNameInput').value;
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const fileInput = document.getElementById('videoFileInput');
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const file = fileInput.files[0];
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if (!name) return alert('Please enter a name');
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try {
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if (file) {
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// --- OPTION A: VIDEO FILE MODE ---
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console.log('Starting stream from video file...');
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// 1. Create a URL for the local file
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const fileURL = URL.createObjectURL(file);
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// 2. Set it to the local video element
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localVideo.src = fileURL;
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localVideo.loop = true; // <--- HERE IS THE LOOP LOGIC
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localVideo.muted = false; // Must be unmuted to capture audio, use headphones!
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localVideo.volume = 1.0;
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// 3. Play the video (required before capturing)
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await localVideo.play();
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// 4. Capture the stream from the video element
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// (Chrome/Edge use captureStream, Firefox uses mozCaptureStream)
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if (localVideo.captureStream) {
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localStream = localVideo.captureStream();
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} else {
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return alert('Your browser does not support capturing video from files.');
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}
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// Note: captureStream() sometimes doesn't capture audio if the element is muted.
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// If you want to stream audio, you must hear it locally too.
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} else {
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// --- OPTION B: WEBCAM MODE ---
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console.log('Starting stream from Webcam...');
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localStream = await navigator.mediaDevices.getUserMedia({
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video: { width: { ideal: 4096 } },
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audio: true,
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});
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localVideo.srcObject = localStream.clone();
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localVideo.muted = true; // Mute local webcam to avoid feedback loop
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}
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// --- COMMON LOGIC ---
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// UI Switch
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lobbyView.style.display = 'none';
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streamView.style.display = 'block';
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remoteVideo.style.display = 'none'; // Broadcaster doesn't see remote
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streamTitle.innerText = `Broadcasting: ${name}`;
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socket.emit('start_stream', name);
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statusDiv.innerText = `Status: Broadcasting (Head) | ID: ${socket.id}`;
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} catch (err) {
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console.error(err);
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alert('Failed to start stream: ' + err.message);
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}
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}
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function joinStream(name) {
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// UI Switch
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lobbyView.style.display = 'none';
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streamView.style.display = 'block';
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localVideo.style.display = 'none'; // Viewers don't see themselves
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streamTitle.innerText = `Watching: ${name}`;
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socket.emit('join_stream', name);
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statusDiv.innerText = `Status: Joining chain... | ID: ${socket.id}`;
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}
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function leaveStream() {
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location.reload(); // Simple way to reset state and go back to lobby
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}
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// --- 3. Health Reporting (Unchanged) ---
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setInterval(calculateAndReportHealth, 5000);
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setInterval(pollPeerMetrics, 2000);
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async function calculateAndReportHealth() {
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if (localStream) {
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socket.emit('update_score', 100);
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return;
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}
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if (!currentUpstreamPC) return;
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try {
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const stats = await currentUpstreamPC.getStats();
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let packetsLost = 0;
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let packetsReceived = 0;
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let jitter = 0;
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stats.forEach((report) => {
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if (report.type === 'inbound-rtp' && report.kind === 'video') {
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packetsLost = report.packetsLost || 0;
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packetsReceived = report.packetsReceived || 0;
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jitter = report.jitter || 0;
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}
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});
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const totalPackets = packetsReceived + packetsLost;
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if (totalPackets === 0) return;
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const lossRate = packetsLost / totalPackets;
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const score = 100 - lossRate * 100 * 5 - jitter * 100;
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const finalScore = Math.max(0, Math.min(100, score));
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console.log(`Health: ${finalScore.toFixed(0)} | Loss: ${(lossRate * 100).toFixed(2)}%`);
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socket.emit('update_score', finalScore);
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} catch (e) {}
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}
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// --- 4. Socket Events (Logic Updated for Smart Disconnect) ---
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socket.on('connect_to_downstream', async ({ downstreamId: targetId }) => {
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downstreamId = targetId;
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await setupDownstreamConnection(targetId);
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});
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socket.on('disconnect_downstream', () => {
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if (currentDownstreamPC) {
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currentDownstreamPC.close();
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currentDownstreamPC = null;
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downstreamId = null;
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}
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oldDownstreamPCs.forEach((pc) => pc.close());
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oldDownstreamPCs = [];
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});
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socket.on('signal_msg', async ({ sender, type, sdp, candidate }) => {
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if (type === 'offer') {
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await handleUpstreamOffer(sender, sdp);
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} else if (type === 'answer') {
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if (currentDownstreamPC && sender === downstreamId) {
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await currentDownstreamPC.setRemoteDescription(new RTCSessionDescription(sdp));
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}
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} else if (type === 'candidate') {
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const ice = new RTCIceCandidate(candidate);
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if (currentDownstreamPC && sender === downstreamId) currentDownstreamPC.addIceCandidate(ice).catch((e) => {});
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if (currentUpstreamPC) currentUpstreamPC.addIceCandidate(ice).catch((e) => {});
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oldUpstreamPCs.forEach((pc) => pc.addIceCandidate(ice).catch((e) => {}));
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oldDownstreamPCs.forEach((pc) => pc.addIceCandidate(ice).catch((e) => {}));
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}
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});
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socket.on('error_msg', (msg) => {
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alert(msg);
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location.reload();
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});
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socket.on('stream_ended', () => {
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alert('Stream ended by host');
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location.reload();
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});
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socket.on('request_keyframe', () => {
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console.log('Network requested keyframe');
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// If we were using Insertable streams, we'd need to handle this.
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// With Standard API, the browser handles PLI automatically.
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});
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// --- 5. WebRTC Logic (Merged Smart Disconnect) ---
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async function handleUpstreamOffer(senderId, sdp) {
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const newPC = new RTCPeerConnection({ iceServers });
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// Safety: If connection hangs, kill old one eventually
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let safetyTimer = setTimeout(() => {
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if (currentUpstreamPC && currentUpstreamPC !== newPC) {
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currentUpstreamPC.close();
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}
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}, 15000);
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newPC.ontrack = async (event) => {
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console.log('Received track from upstream:', event);
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clearTimeout(safetyTimer); // Success!
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if (event.track.kind === 'video') {
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origVideoStream = event.streams[0];
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displayedVideoStream = origVideoStream.clone();
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sentVideoStream = origVideoStream.clone();
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origVideoTrack = event.track;
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displayedVideoTrack = origVideoTrack.clone();
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sentVideoTrack = origVideoTrack.clone();
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} else if (event.track.kind === 'audio') {
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origAudioStream = event.streams[0];
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displayedAudioStream = origAudioStream.clone();
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sentAudioStream = origAudioStream.clone();
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origAudioTrack = event.track;
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displayedAudioTrack = origAudioTrack.clone();
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sentAudioTrack = origAudioTrack.clone();
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}
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// Rebuild displayedStream
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const displayedStream = new MediaStream();
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if (displayedVideoTrack) displayedStream.addTrack(displayedVideoTrack);
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if (displayedAudioTrack) displayedStream.addTrack(displayedAudioTrack);
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remoteVideo.srcObject = displayedStream;
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statusDiv.innerText = `Status: Connected | ID: ${socket.id}`;
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if (currentDownstreamPC) {
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console.log('Relaying new upstream stream to downstream');
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const videoSender = currentDownstreamPC.getSenders().find((s) => s.track && s.track.kind === 'video');
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const audioSender = currentDownstreamPC.getSenders().find((s) => s.track && s.track.kind === 'video');
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if (videoSender) await videoSender.replaceTrack(sentVideoTrack);
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if (audioSender) await audioSender.replaceTrack(sentAudioTrack);
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}
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// Smart Disconnect: Old connection dies immediately upon success
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if (currentUpstreamPC && currentUpstreamPC !== newPC) {
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const oldPC = currentUpstreamPC;
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setTimeout(() => {
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oldPC.close();
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oldUpstreamPCs = oldUpstreamPCs.filter((pc) => pc !== oldPC);
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}, 1000);
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}
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currentUpstreamPC = newPC;
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};
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newPC.onicecandidate = (event) => {
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if (event.candidate) socket.emit('signal_msg', { target: senderId, type: 'candidate', candidate: event.candidate });
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};
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await newPC.setRemoteDescription(new RTCSessionDescription(sdp));
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const answer = await newPC.createAnswer();
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await newPC.setLocalDescription(answer);
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socket.emit('signal_msg', { target: senderId, type: 'answer', sdp: answer });
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}
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async function setupDownstreamConnection(targetId) {
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if (currentDownstreamPC) {
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const oldPC = currentDownstreamPC;
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oldDownstreamPCs.push(oldPC);
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setTimeout(() => {
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oldPC.close();
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oldDownstreamPCs = oldDownstreamPCs.filter((pc) => pc !== oldPC);
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}, 5000);
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}
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currentDownstreamPC = new RTCPeerConnection({ iceServers });
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if (localStream) {
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console.log('Sending local stream tracks to downstream');
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localStream.getTracks().forEach((track) => currentDownstreamPC.addTrack(track, localStream));
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} else if (currentUpstreamPC) {
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console.log('Relaying upstream stream tracks to downstream');
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// currentDownstreamPC.addTrack(sentVideoTrack, sentVideoStream);
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currentUpstreamPC.getReceivers().map((receiver) => {
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console.log('Receiver track:', receiver.track);
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if (!receiver.track) return;
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const sentTrack = receiver.track.kind === 'video' ? sentVideoTrack : sentAudioTrack;
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const sentStream = receiver.track.kind === 'video' ? sentVideoStream : sentAudioStream;
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currentDownstreamPC.addTrack(sentTrack, sentStream);
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});
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}
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currentDownstreamPC.onicecandidate = (event) => {
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if (event.candidate) socket.emit('signal_msg', { target: targetId, type: 'candidate', candidate: event.candidate });
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};
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await Promise.all(
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currentDownstreamPC.getSenders().map(async (sender) => {
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const params = sender.getParameters();
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params.encodings = params.encodings.map((enc) => {
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enc.maxBitrate = 200_000_000;
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enc.maxFramerate = 60;
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enc.scaleResolutionDownBy = 1.0;
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enc.priority = 'high';
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return enc;
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});
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params.degradationPreference = 'maintain-resolution';
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await sender.setParameters(params);
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})
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);
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const offer = await currentDownstreamPC.createOffer();
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// offer.sdp = offer.sdp.replace(/b=AS:([0-9]+)/g, 'b=AS:4000');
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// if (!offer.sdp.includes('b=AS:')) offer.sdp = offer.sdp.replace(/(m=video.*\r\n)/, '$1b=AS:4000\r\n');
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await currentDownstreamPC.setLocalDescription(offer);
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socket.emit('signal_msg', { target: targetId, type: 'offer', sdp: offer });
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}
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// --- 6. Debug Metrics (bitrate / loss / fps) ---
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async function pollPeerMetrics() {
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try {
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const upstreamResult = currentUpstreamPC
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? await collectInboundMetrics(currentUpstreamPC, metricsHistory.upstream)
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: null;
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const downstreamResult = currentDownstreamPC
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? await collectOutboundMetrics(currentDownstreamPC, metricsHistory.downstream)
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: null;
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metricsHistory.upstream = upstreamResult
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? upstreamResult.snapshot
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: currentUpstreamPC
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? metricsHistory.upstream
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: null;
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metricsHistory.downstream = downstreamResult
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? downstreamResult.snapshot
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: currentDownstreamPC
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? metricsHistory.downstream
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: null;
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renderMetrics(upstreamResult ? upstreamResult.display : null, downstreamResult ? downstreamResult.display : null);
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// Stream metrics to the monitor dashboard
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socket.emit('report_metrics', {
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inbound: upstreamResult ? upstreamResult.display : null,
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outbound: downstreamResult ? downstreamResult.display : null,
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});
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} catch (err) {
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console.warn('Metrics poll failed', err);
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}
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}
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async function collectInboundMetrics(pc, previous) {
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const stats = await pc.getStats();
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let inboundVideo = null;
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let candidatePair = null;
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const tag = pc.__metricsTag || (pc.__metricsTag = Math.random().toString(36).slice(2));
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const prev = previous && previous.tag === tag ? previous : null;
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stats.forEach((report) => {
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if (report.type === 'inbound-rtp' && report.kind === 'video' && !report.isRemote) inboundVideo = report;
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if (report.type === 'candidate-pair' && report.state === 'succeeded' && report.nominated) candidatePair = report;
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});
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if (!inboundVideo) return null;
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const deltaMs = prev ? inboundVideo.timestamp - prev.timestamp : null;
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const bytesDelta = prev ? inboundVideo.bytesReceived - prev.bytesReceived : null;
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const bitrateKbps = deltaMs && deltaMs > 0 && bytesDelta >= 0 ? (bytesDelta * 8) / deltaMs : null; // timestamp is ms
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const framesDelta =
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prev && inboundVideo.framesDecoded !== undefined && prev.framesDecoded !== undefined
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? inboundVideo.framesDecoded - prev.framesDecoded
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: null;
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const fps = framesDelta !== null && deltaMs && deltaMs > 0 ? (framesDelta * 1000) / deltaMs : null;
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const packetLossPct =
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inboundVideo.packetsLost !== undefined && inboundVideo.packetsReceived !== undefined
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? (inboundVideo.packetsLost / (inboundVideo.packetsReceived + inboundVideo.packetsLost)) * 100
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: null;
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const jitterMs = inboundVideo.jitter !== undefined ? inboundVideo.jitter * 1000 : null;
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const rttMs =
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candidatePair && candidatePair.currentRoundTripTime !== undefined
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? candidatePair.currentRoundTripTime * 1000
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: null;
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const codecReport = inboundVideo.codecId && stats.get ? stats.get(inboundVideo.codecId) : null;
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const codecLabel = codecReport ? codecReport.mimeType || codecReport.codecId || codecReport.sdpFmtpLine || '' : null;
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return {
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display: {
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bitrateKbps,
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fps,
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resolution:
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inboundVideo.frameWidth && inboundVideo.frameHeight
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? `${inboundVideo.frameWidth}x${inboundVideo.frameHeight}`
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: null,
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packetLossPct,
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jitterMs,
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rttMs,
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pli: inboundVideo.pliCount,
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nack: inboundVideo.nackCount,
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fir: inboundVideo.firCount,
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framesDropped: inboundVideo.framesDropped,
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codec: codecLabel,
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state: pc.iceConnectionState || pc.connectionState,
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},
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snapshot: {
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timestamp: inboundVideo.timestamp,
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bytesReceived: inboundVideo.bytesReceived || 0,
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framesDecoded: inboundVideo.framesDecoded || 0,
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tag,
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},
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};
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}
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async function collectOutboundMetrics(pc, previous) {
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const stats = await pc.getStats();
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let outboundVideo = null;
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let remoteInbound = null;
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let candidatePair = null;
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const tag = pc.__metricsTag || (pc.__metricsTag = Math.random().toString(36).slice(2));
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const prev = previous && previous.tag === tag ? previous : null;
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stats.forEach((report) => {
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if (report.type === 'outbound-rtp' && report.kind === 'video' && !report.isRemote) outboundVideo = report;
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if (report.type === 'remote-inbound-rtp' && report.kind === 'video') remoteInbound = report;
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if (report.type === 'candidate-pair' && report.state === 'succeeded' && report.nominated) candidatePair = report;
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});
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if (!outboundVideo) return null;
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const deltaMs = prev ? outboundVideo.timestamp - prev.timestamp : null;
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const bytesDelta = prev ? outboundVideo.bytesSent - prev.bytesSent : null;
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const bitrateKbps = deltaMs && deltaMs > 0 && bytesDelta >= 0 ? (bytesDelta * 8) / deltaMs : null;
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const framesDelta =
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prev && outboundVideo.framesEncoded !== undefined && prev.framesEncoded !== undefined
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? outboundVideo.framesEncoded - prev.framesEncoded
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: null;
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const fps = framesDelta !== null && deltaMs && deltaMs > 0 ? (framesDelta * 1000) / deltaMs : null;
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let packetLossPct = null;
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if (remoteInbound && remoteInbound.packetsLost !== undefined && remoteInbound.packetsReceived !== undefined) {
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packetLossPct = (remoteInbound.packetsLost / (remoteInbound.packetsReceived + remoteInbound.packetsLost)) * 100;
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}
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const rttMs =
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candidatePair && candidatePair.currentRoundTripTime !== undefined
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? candidatePair.currentRoundTripTime * 1000
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: null;
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const codecReport = outboundVideo.codecId && stats.get ? stats.get(outboundVideo.codecId) : null;
|
|
const codecLabel = codecReport ? codecReport.mimeType || codecReport.codecId || codecReport.sdpFmtpLine || '' : null;
|
|
|
|
return {
|
|
display: {
|
|
bitrateKbps,
|
|
fps,
|
|
resolution:
|
|
outboundVideo.frameWidth && outboundVideo.frameHeight
|
|
? `${outboundVideo.frameWidth}x${outboundVideo.frameHeight}`
|
|
: null,
|
|
packetLossPct,
|
|
rttMs,
|
|
qualityLimit: outboundVideo.qualityLimitationReason || 'none',
|
|
nack: outboundVideo.nackCount,
|
|
pli: outboundVideo.pliCount,
|
|
fir: outboundVideo.firCount,
|
|
retransmits: outboundVideo.retransmittedPacketsSent,
|
|
codec: codecLabel,
|
|
state: pc.iceConnectionState || pc.connectionState,
|
|
},
|
|
snapshot: {
|
|
timestamp: outboundVideo.timestamp,
|
|
bytesSent: outboundVideo.bytesSent || 0,
|
|
framesEncoded: outboundVideo.framesEncoded || 0,
|
|
tag,
|
|
},
|
|
};
|
|
}
|
|
|
|
function renderMetrics(inboundDisplay, outboundDisplay) {
|
|
if (!currentUpstreamPC) {
|
|
upstreamMetricsBox.innerHTML = 'No upstream peer (head broadcaster).';
|
|
} else if (!inboundDisplay) {
|
|
upstreamMetricsBox.innerHTML = 'Collecting inbound stats...';
|
|
} else {
|
|
upstreamMetricsBox.innerHTML = metricsLines([
|
|
['State', inboundDisplay.state || '--'],
|
|
['Bitrate', formatBitrate(inboundDisplay.bitrateKbps)],
|
|
['FPS', formatNumber(inboundDisplay.fps)],
|
|
['Resolution', inboundDisplay.resolution || '--'],
|
|
['Loss', formatPercent(inboundDisplay.packetLossPct)],
|
|
['Jitter', formatMillis(inboundDisplay.jitterMs)],
|
|
['RTT', formatMillis(inboundDisplay.rttMs)],
|
|
['PLI/NACK/FIR', formatTriple(inboundDisplay.pli, inboundDisplay.nack, inboundDisplay.fir)],
|
|
['Frames Dropped', formatCount(inboundDisplay.framesDropped)],
|
|
['Codec', inboundDisplay.codec || '--'],
|
|
]);
|
|
}
|
|
|
|
if (!currentDownstreamPC) {
|
|
downstreamMetricsBox.innerHTML = 'No downstream peer connected.';
|
|
} else if (!outboundDisplay) {
|
|
downstreamMetricsBox.innerHTML = 'Collecting outbound stats...';
|
|
} else {
|
|
downstreamMetricsBox.innerHTML = metricsLines([
|
|
['State', outboundDisplay.state || '--'],
|
|
['Bitrate', formatBitrate(outboundDisplay.bitrateKbps)],
|
|
['FPS', formatNumber(outboundDisplay.fps)],
|
|
['Resolution', outboundDisplay.resolution || '--'],
|
|
['Loss (remote)', formatPercent(outboundDisplay.packetLossPct)],
|
|
['RTT', formatMillis(outboundDisplay.rttMs)],
|
|
['Quality Limit', outboundDisplay.qualityLimit || '--'],
|
|
['PLI/NACK/FIR', formatTriple(outboundDisplay.pli, outboundDisplay.nack, outboundDisplay.fir)],
|
|
['Retransmits', formatCount(outboundDisplay.retransmits)],
|
|
['Codec', outboundDisplay.codec || '--'],
|
|
]);
|
|
}
|
|
}
|
|
|
|
function metricsLines(rows) {
|
|
return rows
|
|
.map(([label, value]) => `<div class="metrics-line"><span>${label}</span><span>${value}</span></div>`)
|
|
.join('');
|
|
}
|
|
|
|
function formatNumber(value, decimals = 1) {
|
|
return Number.isFinite(value) ? value.toFixed(decimals) : '--';
|
|
}
|
|
|
|
function formatBitrate(kbps) {
|
|
return Number.isFinite(kbps) ? `${kbps.toFixed(0)} kbps` : '--';
|
|
}
|
|
|
|
function formatPercent(value) {
|
|
return Number.isFinite(value) ? `${value.toFixed(1)}%` : '--';
|
|
}
|
|
|
|
function formatMillis(value) {
|
|
return Number.isFinite(value) ? `${value.toFixed(1)} ms` : '--';
|
|
}
|
|
|
|
function formatCount(value) {
|
|
return Number.isFinite(value) ? `${value}` : '--';
|
|
}
|
|
|
|
function formatTriple(a, b, c) {
|
|
const pa = Number.isFinite(a) ? a : '-';
|
|
const pb = Number.isFinite(b) ? b : '-';
|
|
const pc = Number.isFinite(c) ? c : '-';
|
|
return `${pa}/${pb}/${pc}`;
|
|
}
|