1.进入如下已打包的UE4项目路径：
E:\WindowsNoEditor\Engine\Source\Programs\PixelStreaming\WebServers\SignallingWebServer
2.打开文件：cirrus
3.在第376行后加入如下代码：
_RemoveExtmapAllowMixed(msg);// 替换sdp协议内新内容
此块整体代码如下：
playerServer.on('connection', function (ws, req) {
// Reject connection if streamer is not connected
if (!streamer || streamer.readyState != 1 /* OPEN */) {
ws.close(1013 /* Try again later */, 'Streamer is not connected');
return;
}
let playerId = ++nextPlayerId;
console.log(`player ${playerId} (${req.connection.remoteAddress}) connected`);
players.set(playerId, { ws: ws, id: playerId });
function sendPlayersCount() {
let playerCountMsg = JSON.stringify({ type: 'playerCount', count: players.size });
for (let p of players.values()) {
p.ws.send(playerCountMsg);
}
}
ws.on('message', function (msg) {
console.logColor(logging.Blue, `<- player ${playerId}: ${msg}`);
try {
msg = JSON.parse(msg);
} catch (err) {
console.error(`Cannot parse player ${playerId} message: ${err}`);
ws.close(1008, 'Cannot parse');
return;
}
if (msg.type == 'offer') {
console.log(`<- player ${playerId}: offer`);
_RemoveExtmapAllowMixed(msg);// 替换sdp协议内新内容
msg.playerId = playerId;
streamer.send(JSON.stringify(msg));
} else if (msg.type == 'iceCandidate') {
console.log(`<- player ${playerId}: iceCandidate`);
msg.playerId = playerId;
streamer.send(JSON.stringify(msg));
} else if (msg.type == 'stats') {
console.log(`<- player ${playerId}: stats\n${msg.data}`);
} else if (msg.type == 'kick') {
let playersCopy = new Map(players);
for (let p of playersCopy.values()) {
if (p.id != playerId) {
console.log(`kicking player ${p.id}`)
p.ws.close(4000, 'kicked');
}
}
} else {
console.error(`<- player ${playerId}: unsupported message type: ${msg.type}`);
ws.close(1008, 'Unsupported message type');
return;
}
});
function onPlayerDisconnected() {
players.delete(playerId);
streamer.send(JSON.stringify({type: 'playerDisconnected', playerId: playerId}));
sendPlayerDisconnectedToFrontend();
sendPlayerDisconnectedToMatchmaker();
sendPlayersCount();
}
ws.on('close', function(code, reason) {
console.logColor(logging.Yellow, `player ${playerId} connection closed: ${code} - ${reason}`);
onPlayerDisconnected();
});
ws.on('error', function(error) {
console.error(`player ${playerId} connection error: ${error}`);
ws.close(1006 /* abnormal closure */, error);
onPlayerDisconnected();
});
sendPlayerConnectedToFrontend();
sendPlayerConnectedToMatchmaker();
ws.send(JSON.stringify(clientConfig));
sendPlayersCount();
});
4.在文件末尾追加如下代码
/**
* sdp协议更新的方法
* @param desc offer内容
* @returns {string}
*/
function _RemoveExtmapAllowMixed(desc) {
if (desc.sdp.indexOf('\na=extmap-allow-mixed') !== -1) {
const sdp = desc.sdp.split('\n').filter((line) => {
return line.trim() !== 'a=extmap-allow-mixed';
}).join('\n');
desc.sdp = sdp;
return sdp;
}
}
原文链接：https://blog.csdn.net/qq_41742112/article/details/121158798
