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Add WebRTC Extension PoC. Disabled by default, for now. See Issue #1082

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xntrik committed Dec 23, 2014
1 parent b0cfe3c commit 74c8dc7bcdea30254905e231ea5a2be853d90267
@@ -0,0 +1,200 @@
var RTCPeerConnection = null;
var getUserMedia = null;
var attachMediaStream = null;
var reattachMediaStream = null;
var webrtcDetectedBrowser = null;
var webrtcDetectedVersion = null;

function maybeFixConfiguration(pcConfig) {
if (pcConfig === null) {
return;
}
for (var i = 0; i < pcConfig.iceServers.length; i++) {
if (pcConfig.iceServers[i].hasOwnProperty('urls')){
if (pcConfig.iceServers[i]['urls'].length > 0) {
// In FF - we just take the FIRST STUN Server
pcConfig.iceServers[i]['url'] = pcConfig.iceServers[i]['urls'][0];
} else {
pcConfig.iceServers[i]['url'] = pcConfig.iceServers[i]['urls'];
}
delete pcConfig.iceServers[i]['urls'];
}
}
}

if (navigator.mozGetUserMedia) {

webrtcDetectedBrowser = "firefox";

webrtcDetectedVersion =
parseInt(navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1], 10);

// The RTCPeerConnection object.
var RTCPeerConnection = function(pcConfig, pcConstraints) {
// .urls is not supported in FF yet.
maybeFixConfiguration(pcConfig);
return new mozRTCPeerConnection(pcConfig, pcConstraints);
}

// The RTCSessionDescription object.
RTCSessionDescription = mozRTCSessionDescription;

// The RTCIceCandidate object.
RTCIceCandidate = mozRTCIceCandidate;

// Get UserMedia (only difference is the prefix).
// Code from Adam Barth.
getUserMedia = navigator.mozGetUserMedia.bind(navigator);
navigator.getUserMedia = getUserMedia;

// Creates iceServer from the url for FF.
createIceServer = function(url, username, password) {
var iceServer = null;
var url_parts = url.split(':');
if (url_parts[0].indexOf('stun') === 0) {
// Create iceServer with stun url.
iceServer = { 'url': url };
} else if (url_parts[0].indexOf('turn') === 0) {
if (webrtcDetectedVersion < 27) {
// Create iceServer with turn url.
// Ignore the transport parameter from TURN url for FF version <=27.
var turn_url_parts = url.split("?");
// Return null for createIceServer if transport=tcp.
if (turn_url_parts.length === 1 ||
turn_url_parts[1].indexOf('transport=udp') === 0) {
iceServer = {'url': turn_url_parts[0],
'credential': password,
'username': username};
}
} else {
// FF 27 and above supports transport parameters in TURN url,
// So passing in the full url to create iceServer.
iceServer = {'url': url,
'credential': password,
'username': username};
}
}
return iceServer;
};

createIceServers = function(urls, username, password) {
var iceServers = [];
// Use .url for FireFox.
for (i = 0; i < urls.length; i++) {
var iceServer = createIceServer(urls[i],
username,
password);
if (iceServer !== null) {
iceServers.push(iceServer);
}
}
return iceServers;
}

// Attach a media stream to an element.
attachMediaStream = function(element, stream) {
console.log("Attaching media stream");
element.mozSrcObject = stream;
element.play();
};

reattachMediaStream = function(to, from) {
console.log("Reattaching media stream");
to.mozSrcObject = from.mozSrcObject;
to.play();
};

// Fake get{Video,Audio}Tracks
if (!MediaStream.prototype.getVideoTracks) {
MediaStream.prototype.getVideoTracks = function() {
return [];
};
}

if (!MediaStream.prototype.getAudioTracks) {
MediaStream.prototype.getAudioTracks = function() {
return [];
};
}
} else if (navigator.webkitGetUserMedia) {

webrtcDetectedBrowser = "chrome";
// Temporary fix until crbug/374263 is fixed.
// Setting Chrome version to 999, if version is unavailable.
var result = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
if (result !== null) {
webrtcDetectedVersion = parseInt(result[2], 10);
} else {
webrtcDetectedVersion = 999;
}

// Creates iceServer from the url for Chrome M33 and earlier.
createIceServer = function(url, username, password) {
var iceServer = null;
var url_parts = url.split(':');
if (url_parts[0].indexOf('stun') === 0) {
// Create iceServer with stun url.
iceServer = { 'url': url };
} else if (url_parts[0].indexOf('turn') === 0) {
// Chrome M28 & above uses below TURN format.
iceServer = {'url': url,
'credential': password,
'username': username};
}
return iceServer;
};

// Creates iceServers from the urls for Chrome M34 and above.
createIceServers = function(urls, username, password) {
var iceServers = [];
if (webrtcDetectedVersion >= 34) {
// .urls is supported since Chrome M34.
iceServers = {'urls': urls,
'credential': password,
'username': username };
} else {
for (i = 0; i < urls.length; i++) {
var iceServer = createIceServer(urls[i],
username,
password);
if (iceServer !== null) {
iceServers.push(iceServer);
}
}
}
return iceServers;
};

// The RTCPeerConnection object.
var RTCPeerConnection = function(pcConfig, pcConstraints) {
// .urls is supported since Chrome M34.
if (webrtcDetectedVersion < 34) {
maybeFixConfiguration(pcConfig);
}
return new webkitRTCPeerConnection(pcConfig, pcConstraints);
}

// Get UserMedia (only difference is the prefix).
// Code from Adam Barth.
getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
navigator.getUserMedia = getUserMedia;

// Attach a media stream to an element.
attachMediaStream = function(element, stream) {
if (typeof element.srcObject !== 'undefined') {
element.srcObject = stream;
} else if (typeof element.mozSrcObject !== 'undefined') {
element.mozSrcObject = stream;
} else if (typeof element.src !== 'undefined') {
element.src = URL.createObjectURL(stream);
} else {
console.log('Error attaching stream to element.');
}
};

reattachMediaStream = function(to, from) {
to.src = from.src;
};
} else {
console.log("Browser does not appear to be WebRTC-capable");
}

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