我正在为桌面共享编写一个简单的WebRTC Google Chrome扩展程序。我尝试使用getusermedia
,但每次调用错误回调函数时都会返回错误:
NavigatorUserMediaError {constraintName: "",
message: "",
name: "InvalidStateError"}
我的代码是:
var iconPath = "images/";
var iconCapture = "player_play48.png";
var iconPause = "player_stop48.png";
window.onload = init; //all'avvio
function init() {
localStorage["capturing"] = "off";
}
chrome.browserAction.onClicked.addListener(function(tab) {
var currentMode = localStorage["capturing"];
var newMode = currentMode === "on" ? "off" : "on";
// start capture
if (newMode === "on"){
console.log('running');
// NB questi messaggi saranno visualizzati sulla pagina
// di background
captureDesktop();
} // stop capture
else {
console.log('stopped');
// NB questi messaggi saranno visualizzati sulla pagina
// di background
}
localStorage["capturing"] = newMode;
// if capturing is now on, display pause icon -- and vice versa
var iconFileName = newMode === "on" ? iconPause : iconCapture;
chrome.browserAction.setIcon({path: iconPath + iconFileName});
var title = newMode === "on" ?
"Click to stop capture"
: "Click to start capture";
chrome.browserAction.setTitle({"title": title});
}); //fine pezzo relativo al click
function captureDesktop(){
chrome.desktopCapture.chooseDesktopMedia(["screen", "window"],
onAccessApproved);
console.log('siamo nel captureDesktop');
}
function onAccessApproved(desktop_id) {
if (!desktop_id) { //se è nulla, l'utente ha rifiutato la richiesta
alert('Desktop Capture access rejected.'); // verrà mostrato il
// seguente messaggio e si
// esce
return;
}
console.log('siamo in onAccessApproved');
navigator.webkitGetUserMedia({
audio: true,
video: true
}, gotStream, getUserMediaError);
function gotStream(stream) {
if (!stream) {
alert('Unable to capture Desktop. Note that
Chrome internal pages cannot be captured.');
return;
}
console.log("Received local stream");
//setupConnection(stream); // chiama una funzione più giù
// passandole lo stream catturato
}
function getUserMediaError(e) {
console.log(e);
alert('getUserMediaError: ' + JSON.stringify(e, null, '---'));
}
}
文件Manifest.json是这样的:
{
"manifest_version": 2,
"name": "WebRTC Desktop Sharing",
"version": "1.0",
"description": "Chrome Extension for Desktop Sharing with WebRTC API",
"browser_action": {
"default_icon": "images/player_play16.png",
"default_title" : "Play!"
},
"background": {
"scripts": ["event.js"],
"persistent": false
},
"icons" : {
"16" : "images/player_play16.png",
"22" : "images/player_play22.png",
"29" : "images/player_play29.png",
"32" : "images/player_play32.png",
"48" : "images/player_play48.png",
"128": "images/player_play128.png"
},
"permissions": ["desktopCapture", "activeTab", "contextMenus"]
}
非常感谢谁会帮助我!
答案 0 :(得分:2)
这是三大难题。
你使用了错误的约束,一方面。你不是要求屏幕,你要求定期的旧音频和视频。将约束更改为以下内容:
navigator.webkitGetUserMedia({
audio: false,
video: {
mandatory: {
chromeMediaSource: "desktop",
maxWidth: 1920,
maxHeight: 1080
},
optional: [{
googTemporalLayeredScreencast: true
}]
}
}, gotStream, getUserMediaError);
如果您使用的是旧版Chrome,请确保您的网站使用的是SSL / HTTPS,并且您已使用--enable-usermedia-screen-capture
标记启动了Chrome。如果您使用的是新版Chrome,则flag has been removed赞成将所有屏幕共享限制为扩展程序。如有疑问,请查看Google's own example code或WebRTC-Experiment是否适合您。谷歌的例子对我不起作用,但WebRTC-Experiment的确如此。祝好运!如果我发现任何其他内容或者让我自己工作,我会回发。
答案 1 :(得分:1)
您的网页上是否有SSL证书?它在页面上播放需要能够为您的Chrome getUserMedia使用HTTPS协议...
你无法播放音频桌面共享方法
更改此行audio:true
audio:false