使用信令服务器来限制发送方数量
当使用 Android TV 进行投屏时,系统默认会限制发送方的数量,以避免网络拥堵和降低投屏质量。如果需要增加发送方数量,需要使用信令服务器来进行限制。
下面是一个使用 WebSocket 进行信令的代码示例:
// 客户端代码
const signaling = new WebSocket('ws://example.com/signaling');
// 发送 offer
signaling.send(JSON.stringify({
type: 'offer',
sender: 'abc',
receiver: 'def',
offer: '...'
}));
// 接收 answer
signaling.onmessage = ({ data }) => {
const { type, sender, receiver, answer } = JSON.parse(data);
if (type === 'answer' && sender === 'def' && receiver === 'abc') {
// 处理 answer
}
};
// 服务器代码
const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });
const clients = new Map();
wss.on('connection', (socket) => {
socket.on('message', (msg) => {
const { type, sender, receiver } = JSON.parse(msg);
if (type === 'offer') {
if (!clients.has(receiver)) {
socket.send(JSON.stringify({ type: 'error', message: 'Receiver not found' }));
} else {
const receiverSocket = clients.get(receiver);
if (receiverSocket.ready) {
socket.send(JSON.stringify({ type: 'error', message: 'Receiver busy' }));
} else {
receiverSocket.send(msg);
receiverSocket.ready = true;
}
}
} else if (type === 'answer') {
if (!clients.has(sender)) {
socket.send(JSON.stringify({ type: 'error', message: 'Sender not found' }));
} else {
const senderSocket = clients.get(sender);
senderSocket.send(msg);
senderSocket.ready = false;
}
}
});
socket.on('close', () => {
for (const [id, client] of clients.entries()) {
if (client === socket