@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
198 lines (194 loc) • 16.7 kB
JavaScript
/**
* @packageDocumentation
* @module Voice
* @internalapi
*/
// @ts-nocheck
// tslint:disable only-arrow-functions
/* global webkitRTCPeerConnection, mozRTCPeerConnection, mozRTCSessionDescription, mozRTCIceCandidate */
import Log from '../log';
import * as util from '../util';
import { setCodecPreferences, setMaxAverageBitrate } from './sdp';
const RTCPeerConnectionShim = require('rtcpeerconnection-shim');
function RTCPC(options) {
if (typeof window === 'undefined') {
this.log.info('No RTCPeerConnection implementation available. The window object was not found.');
return;
}
if (options && options.RTCPeerConnection) {
this.RTCPeerConnection = options.RTCPeerConnection;
}
else if (util.isLegacyEdge()) {
this.RTCPeerConnection = new RTCPeerConnectionShim(typeof window !== 'undefined' ? window : global);
}
else if (typeof window.RTCPeerConnection === 'function') {
this.RTCPeerConnection = window.RTCPeerConnection;
}
else if (typeof window.webkitRTCPeerConnection === 'function') {
this.RTCPeerConnection = webkitRTCPeerConnection;
}
else if (typeof window.mozRTCPeerConnection === 'function') {
this.RTCPeerConnection = mozRTCPeerConnection;
window.RTCSessionDescription = mozRTCSessionDescription;
window.RTCIceCandidate = mozRTCIceCandidate;
}
else {
this.log.info('No RTCPeerConnection implementation available');
}
}
RTCPC.prototype.create = function (rtcConstraints, rtcConfiguration) {
this.log = Log.getInstance();
this.pc = new this.RTCPeerConnection(rtcConfiguration, rtcConstraints);
};
RTCPC.prototype.createModernConstraints = c => {
// createOffer differs between Chrome 23 and Chrome 24+.
// See https://groups.google.com/forum/?fromgroups=#!topic/discuss-webrtc/JBDZtrMumyU
// Unfortunately I haven't figured out a way to detect which format
// is required ahead of time, so we'll first try the old way, and
// if we get an exception, then we'll try the new way.
if (typeof c === 'undefined') {
return null;
}
// NOTE(mroberts): As of Chrome 38, Chrome still appears to expect
// constraints under the 'mandatory' key, and with the first letter of each
// constraint capitalized. Firefox, on the other hand, has deprecated the
// 'mandatory' key and does not expect the first letter of each constraint
// capitalized.
const nc = Object.assign({}, c);
if (typeof webkitRTCPeerConnection !== 'undefined' && !util.isLegacyEdge()) {
nc.mandatory = {};
if (typeof c.audio !== 'undefined') {
nc.mandatory.OfferToReceiveAudio = c.audio;
}
if (typeof c.video !== 'undefined') {
nc.mandatory.OfferToReceiveVideo = c.video;
}
}
else {
if (typeof c.audio !== 'undefined') {
nc.offerToReceiveAudio = c.audio;
}
if (typeof c.video !== 'undefined') {
nc.offerToReceiveVideo = c.video;
}
}
delete nc.audio;
delete nc.video;
return nc;
};
RTCPC.prototype.createOffer = function (maxAverageBitrate, codecPreferences, constraints, onSuccess, onError) {
constraints = this.createModernConstraints(constraints);
return promisifyCreate(this.pc.createOffer, this.pc)(constraints).then(offer => {
if (!this.pc) {
return Promise.resolve();
}
const sdp = setMaxAverageBitrate(offer.sdp, maxAverageBitrate);
return promisifySet(this.pc.setLocalDescription, this.pc)(new RTCSessionDescription({
sdp: setCodecPreferences(sdp, codecPreferences),
type: 'offer',
}));
}).then(onSuccess, onError);
};
RTCPC.prototype.createAnswer = function (maxAverageBitrate, codecPreferences, constraints, onSuccess, onError) {
constraints = this.createModernConstraints(constraints);
return promisifyCreate(this.pc.createAnswer, this.pc)(constraints).then(answer => {
if (!this.pc) {
return Promise.resolve();
}
const sdp = setMaxAverageBitrate(answer.sdp, maxAverageBitrate);
return promisifySet(this.pc.setLocalDescription, this.pc)(new RTCSessionDescription({
sdp: setCodecPreferences(sdp, codecPreferences),
type: 'answer',
}));
}).then(onSuccess, onError);
};
RTCPC.prototype.processSDP = function (maxAverageBitrate, codecPreferences, sdp, constraints, onSuccess, onError) {
sdp = setCodecPreferences(sdp, codecPreferences);
const desc = new RTCSessionDescription({ sdp, type: 'offer' });
return promisifySet(this.pc.setRemoteDescription, this.pc)(desc).then(() => {
this.createAnswer(maxAverageBitrate, codecPreferences, constraints, onSuccess, onError);
});
};
RTCPC.prototype.getSDP = function () {
return this.pc.localDescription.sdp;
};
RTCPC.prototype.processAnswer = function (codecPreferences, sdp, onSuccess, onError) {
if (!this.pc) {
return Promise.resolve();
}
sdp = setCodecPreferences(sdp, codecPreferences);
return promisifySet(this.pc.setRemoteDescription, this.pc)(new RTCSessionDescription({ sdp, type: 'answer' })).then(onSuccess, onError);
};
/* NOTE(mroberts): Firefox 18 through 21 include a `mozRTCPeerConnection`
object, but attempting to instantiate it will throw the error
Error: PeerConnection not enabled (did you set the pref?)
unless the `media.peerconnection.enabled` pref is enabled. So we need to test
if we can actually instantiate `mozRTCPeerConnection`; however, if the user
*has* enabled `media.peerconnection.enabled`, we need to perform the same
test that we use to detect Firefox 24 and above, namely:
typeof (new mozRTCPeerConnection()).getLocalStreams === 'function'
NOTE(rrowland): We no longer support Legacy Edge as of Sep 1, 2020.
*/
RTCPC.test = () => {
if (typeof navigator === 'object') {
const getUserMedia = (navigator.mediaDevices && navigator.mediaDevices.getUserMedia)
|| navigator.webkitGetUserMedia
|| navigator.mozGetUserMedia
|| navigator.getUserMedia;
if (util.isLegacyEdge(navigator)) {
return false;
}
if (getUserMedia && typeof window.RTCPeerConnection === 'function') {
return true;
}
else if (getUserMedia && typeof window.webkitRTCPeerConnection === 'function') {
return true;
}
else if (getUserMedia && typeof window.mozRTCPeerConnection === 'function') {
try {
const test = new window.mozRTCPeerConnection();
if (typeof test.getLocalStreams !== 'function') {
return false;
}
}
catch (e) {
return false;
}
return true;
}
else if (typeof RTCIceGatherer !== 'undefined') {
return true;
}
}
return false;
};
function promisify(fn, ctx, areCallbacksFirst, checkRval) {
return function () {
const args = Array.prototype.slice.call(arguments);
return new Promise(resolve => {
const returnValue = fn.apply(ctx, args);
if (!checkRval) {
resolve(returnValue);
return;
}
if (typeof returnValue === 'object' && typeof returnValue.then === 'function') {
resolve(returnValue);
}
else {
throw new Error();
}
}).catch(() => new Promise((resolve, reject) => {
fn.apply(ctx, areCallbacksFirst
? [resolve, reject].concat(args)
: args.concat([resolve, reject]));
}));
};
}
function promisifyCreate(fn, ctx) {
return promisify(fn, ctx, true, true);
}
function promisifySet(fn, ctx) {
return promisify(fn, ctx, false, false);
}
export default RTCPC;
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