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@twilio/voice-sdk

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/** * @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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