@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
273 lines • 18.8 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
/**
* @packageDocumentation
* @module Voice
* @internalapi
*/
// @ts-nocheck
import Deferred from './deferred';
import EventTarget from './eventtarget';
/**
* An {@link AudioPlayer} is an HTMLAudioElement-like object that uses AudioContext
* to circumvent browser limitations.
* @private
*/
class AudioPlayer extends EventTarget {
/**
* @private
*/
constructor(audioContext, srcOrOptions = {}, options = {}) {
super();
/**
* The AudioBufferSourceNode of the actively loaded sound. Null if a sound
* has not been loaded yet. This is re-used for each time the sound is
* played.
*/
this._audioNode = null;
/**
* Whether or not the audio element should loop. If disabled during playback,
* playing continues until the sound ends and then stops looping.
*/
this._loop = false;
/**
* An Array of deferred-like objects for each pending `play` Promise. When
* .pause() is called or .src is set, all pending play Promises are
* immediately rejected.
*/
this._pendingPlayDeferreds = [];
/**
* The current sinkId of the device audio is being played through.
*/
this._sinkId = 'default';
/**
* The source URL of the sound to play. When set, the currently playing sound will stop.
*/
this._src = '';
if (typeof srcOrOptions !== 'string') {
options = srcOrOptions;
}
this._audioContext = audioContext;
this._audioElement = new (options.AudioFactory || Audio)();
this._bufferPromise = this._createPlayDeferred().promise;
this._destination = this._audioContext.destination;
this._gainNode = this._audioContext.createGain();
this._gainNode.connect(this._destination);
this._XMLHttpRequest = options.XMLHttpRequestFactory || XMLHttpRequest;
this.addEventListener('canplaythrough', () => {
this._resolvePlayDeferreds();
});
if (typeof srcOrOptions === 'string') {
this.src = srcOrOptions;
}
}
get destination() { return this._destination; }
get loop() { return this._loop; }
set loop(shouldLoop) {
const self = this;
function pauseAfterPlaythrough() {
self._audioNode.removeEventListener('ended', pauseAfterPlaythrough);
self.pause();
}
// If a sound is already looping, it should continue playing
// the current playthrough and then stop.
if (!shouldLoop && this.loop && !this.paused) {
this._audioNode.addEventListener('ended', pauseAfterPlaythrough);
}
this._loop = shouldLoop;
}
/**
* Whether the audio element is muted.
*/
get muted() { return this._gainNode.gain.value === 0; }
set muted(shouldBeMuted) {
this._gainNode.gain.value = shouldBeMuted ? 0 : 1;
}
/**
* Whether the sound is paused. this._audioNode only exists when sound is playing;
* otherwise AudioPlayer is considered paused.
*/
get paused() { return this._audioNode === null; }
get src() { return this._src; }
set src(src) {
this._load(src);
}
/**
* The srcObject of the HTMLMediaElement
*/
get srcObject() {
return this._audioElement.srcObject;
}
set srcObject(srcObject) {
this._audioElement.srcObject = srcObject;
}
get sinkId() { return this._sinkId; }
/**
* Stop any ongoing playback and reload the source file.
*/
load() {
this._load(this._src);
}
/**
* Pause the audio coming from this AudioPlayer. This will reject any pending
* play Promises.
*/
pause() {
if (this.paused) {
return;
}
this._audioElement.pause();
this._audioNode.stop();
this._audioNode.disconnect(this._gainNode);
this._audioNode = null;
this._rejectPlayDeferreds(new Error('The play() request was interrupted by a call to pause().'));
}
/**
* Play the sound. If the buffer hasn't loaded yet, wait for the buffer to load. If
* the source URL is not set yet, this Promise will remain pending until a source
* URL is set.
*/
play() {
return __awaiter(this, void 0, void 0, function* () {
if (!this.paused) {
yield this._bufferPromise;
if (!this.paused) {
return;
}
throw new Error('The play() request was interrupted by a call to pause().');
}
this._audioNode = this._audioContext.createBufferSource();
this._audioNode.loop = this.loop;
this._audioNode.addEventListener('ended', () => {
if (this._audioNode && this._audioNode.loop) {
return;
}
this.dispatchEvent('ended');
});
const buffer = yield this._bufferPromise;
if (this.paused) {
throw new Error('The play() request was interrupted by a call to pause().');
}
this._audioNode.buffer = buffer;
this._audioNode.connect(this._gainNode);
this._audioNode.start();
if (this._audioElement.srcObject) {
return this._audioElement.play();
}
});
}
/**
* Change which device the sound should play through.
* @param sinkId - The sink of the device to play sound through.
*/
setSinkId(sinkId) {
return __awaiter(this, void 0, void 0, function* () {
if (typeof this._audioElement.setSinkId !== 'function') {
throw new Error('This browser does not support setSinkId.');
}
if (sinkId === this.sinkId) {
return;
}
if (sinkId === 'default') {
if (!this.paused) {
this._gainNode.disconnect(this._destination);
}
this._audioElement.srcObject = null;
this._destination = this._audioContext.destination;
this._gainNode.connect(this._destination);
this._sinkId = sinkId;
return;
}
yield this._audioElement.setSinkId(sinkId);
if (this._audioElement.srcObject) {
return;
}
this._gainNode.disconnect(this._audioContext.destination);
this._destination = this._audioContext.createMediaStreamDestination();
this._audioElement.srcObject = this._destination.stream;
this._sinkId = sinkId;
this._gainNode.connect(this._destination);
});
}
/**
* Create a Deferred for a Promise that will be resolved when .src is set or rejected
* when .pause is called.
*/
_createPlayDeferred() {
const deferred = new Deferred();
this._pendingPlayDeferreds.push(deferred);
return deferred;
}
/**
* Stop current playback and load a sound file.
* @param src - The source URL of the file to load
*/
_load(src) {
if (this._src && this._src !== src) {
this.pause();
}
this._src = src;
this._bufferPromise = new Promise((resolve, reject) => __awaiter(this, void 0, void 0, function* () {
if (!src) {
return this._createPlayDeferred().promise;
}
const buffer = yield bufferSound(this._audioContext, this._XMLHttpRequest, src);
this.dispatchEvent('canplaythrough');
resolve(buffer);
}));
}
/**
* Reject all deferreds for the Play promise.
* @param reason
*/
_rejectPlayDeferreds(reason) {
const deferreds = this._pendingPlayDeferreds;
deferreds.splice(0, deferreds.length).forEach(({ reject }) => reject(reason));
}
/**
* Resolve all deferreds for the Play promise.
* @param result
*/
_resolvePlayDeferreds(result) {
const deferreds = this._pendingPlayDeferreds;
deferreds.splice(0, deferreds.length).forEach(({ resolve }) => resolve(result));
}
}
/**
* Use XMLHttpRequest to load the AudioBuffer of a remote audio asset.
* @private
* @param context - The AudioContext to use to decode the audio data
* @param RequestFactory - The XMLHttpRequest factory to build
* @param src - The URL of the audio asset to load.
* @returns A Promise containing the decoded AudioBuffer.
*/
// tslint:disable-next-line:variable-name
function bufferSound(context, RequestFactory, src) {
return __awaiter(this, void 0, void 0, function* () {
const request = new RequestFactory();
request.open('GET', src, true);
request.responseType = 'arraybuffer';
const event = yield new Promise(resolve => {
request.addEventListener('load', resolve);
request.send();
});
// Safari uses a callback here instead of a Promise.
try {
return context.decodeAudioData(event.target.response);
}
catch (e) {
return new Promise(resolve => {
context.decodeAudioData(event.target.response, resolve);
});
}
});
}
export default AudioPlayer;
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