bricks/3parties/webrtc_adapter.js

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2024-04-14 16:35:49 +08:00
/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree.
*/
/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree.
*/
'use strict';
var RTCPeerConnection = null;
var getUserMedia = null;
var attachMediaStream = null;
var reattachMediaStream = null;
var webrtcDetectedBrowser = null;
var webrtcDetectedVersion = null;
function maybeFixConfiguration(pcConfig) {
if (!pcConfig) {
return;
}
for (var i = 0; i < pcConfig.iceServers.length; i++) {
if (pcConfig.iceServers[i].hasOwnProperty('urls')) {
pcConfig.iceServers[i].url = pcConfig.iceServers[i].urls;
delete pcConfig.iceServers[i].urls;
}
}
}
if (navigator.mozGetUserMedia) {
console.log('This appears to be Firefox');
window.webrtcDetectedBrowser = 'firefox';
window.webrtcDetectedVersion =
parseInt(navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1], 10);
// The RTCPeerConnection object.
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.
window.getUserMedia = navigator.mozGetUserMedia.bind(navigator);
navigator.getUserMedia = getUserMedia;
// Creates iceServer from the url for FF.
window.createIceServer = function(url, username, password) {
var iceServer = null;
var urlParts = url.split(':');
if (urlParts[0].indexOf('stun') === 0) {
// Create iceServer with stun url.
iceServer = {
'url': url
};
} else if (urlParts[0].indexOf('turn') === 0) {
if (webrtcDetectedVersion < 27) {
// Create iceServer with turn url.
// Ignore the transport parameter from TURN url for FF version <=27.
var turnUrlParts = url.split('?');
// Return null for createIceServer if transport=tcp.
if (turnUrlParts.length === 1 ||
turnUrlParts[1].indexOf('transport=udp') === 0) {
iceServer = {
'url': turnUrlParts[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;
};
window.createIceServers = function(urls, username, password) {
var iceServers = [];
// Use .url for FireFox.
for (var 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.
window.attachMediaStream = function(element, stream) {
console.log('Attaching media stream');
element.mozSrcObject = stream;
element.play();
};
window.reattachMediaStream = function(to, from) {
console.log('Reattaching media stream');
to.mozSrcObject = from.mozSrcObject;
to.play();
};
} else if (navigator.webkitGetUserMedia) {
console.log('This appears to be Chrome');
window.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) {
window.webrtcDetectedVersion = parseInt(result[2], 10);
} else {
window.webrtcDetectedVersion = 999;
}
// Creates iceServer from the url for Chrome M33 and earlier.
window.createIceServer = function(url, username, password) {
var iceServer = null;
var urlParts = url.split(':');
if (urlParts[0].indexOf('stun') === 0) {
// Create iceServer with stun url.
iceServer = {
'url': url
};
} else if (urlParts[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.
window.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 (var i = 0; i < urls.length; i++) {
var iceServer = createIceServer(urls[i],
username,
password);
if (iceServer !== null) {
iceServers.push(iceServer);
}
}
}
return iceServers;
};
// The RTCPeerConnection object.
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.
window.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
navigator.getUserMedia = getUserMedia;
// Attach a media stream to an element.
window.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.');
}
};
window.reattachMediaStream = function(to, from) {
to.src = from.src;
};
} else {
console.log('Browser does not appear to be WebRTC-capable');
}