@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
344 lines (339 loc) • 24.5 kB
JavaScript
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var tslib = require('tslib');
var deferred = require('./deferred.js');
var eventtarget = require('./eventtarget.js');
/**
* An {@link AudioPlayer} is an HTMLAudioElement-like object that uses AudioContext
* to circumvent browser limitations.
* @private
*/
var AudioPlayer = /** @class */ (function (_super) {
tslib.__extends(AudioPlayer, _super);
/**
* @private
*/
function AudioPlayer(audioContext, srcOrOptions, options) {
if (srcOrOptions === void 0) { srcOrOptions = {}; }
if (options === void 0) { options = {}; }
var _this = _super.call(this) || this;
/**
* 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', function () {
_this._resolvePlayDeferreds();
});
if (typeof srcOrOptions === 'string') {
_this.src = srcOrOptions;
}
return _this;
}
Object.defineProperty(AudioPlayer.prototype, "destination", {
get: function () { return this._destination; },
enumerable: false,
configurable: true
});
Object.defineProperty(AudioPlayer.prototype, "loop", {
get: function () { return this._loop; },
set: function (shouldLoop) {
var 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;
},
enumerable: false,
configurable: true
});
Object.defineProperty(AudioPlayer.prototype, "muted", {
/**
* Whether the audio element is muted.
*/
get: function () { return this._gainNode.gain.value === 0; },
set: function (shouldBeMuted) {
this._gainNode.gain.value = shouldBeMuted ? 0 : 1;
},
enumerable: false,
configurable: true
});
Object.defineProperty(AudioPlayer.prototype, "paused", {
/**
* Whether the sound is paused. this._audioNode only exists when sound is playing;
* otherwise AudioPlayer is considered paused.
*/
get: function () { return this._audioNode === null; },
enumerable: false,
configurable: true
});
Object.defineProperty(AudioPlayer.prototype, "src", {
get: function () { return this._src; },
set: function (src) {
this._load(src);
},
enumerable: false,
configurable: true
});
Object.defineProperty(AudioPlayer.prototype, "srcObject", {
/**
* The srcObject of the HTMLMediaElement
*/
get: function () {
return this._audioElement.srcObject;
},
set: function (srcObject) {
this._audioElement.srcObject = srcObject;
},
enumerable: false,
configurable: true
});
Object.defineProperty(AudioPlayer.prototype, "sinkId", {
get: function () { return this._sinkId; },
enumerable: false,
configurable: true
});
/**
* Stop any ongoing playback and reload the source file.
*/
AudioPlayer.prototype.load = function () {
this._load(this._src);
};
/**
* Pause the audio coming from this AudioPlayer. This will reject any pending
* play Promises.
*/
AudioPlayer.prototype.pause = function () {
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.
*/
AudioPlayer.prototype.play = function () {
return tslib.__awaiter(this, void 0, void 0, function () {
var buffer;
var _this = this;
return tslib.__generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!!this.paused) return [3 /*break*/, 2];
return [4 /*yield*/, this._bufferPromise];
case 1:
_a.sent();
if (!this.paused) {
return [2 /*return*/];
}
throw new Error('The play() request was interrupted by a call to pause().');
case 2:
this._audioNode = this._audioContext.createBufferSource();
this._audioNode.loop = this.loop;
this._audioNode.addEventListener('ended', function () {
if (_this._audioNode && _this._audioNode.loop) {
return;
}
_this.dispatchEvent('ended');
});
return [4 /*yield*/, this._bufferPromise];
case 3:
buffer = _a.sent();
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 [2 /*return*/, this._audioElement.play()];
}
return [2 /*return*/];
}
});
});
};
/**
* Change which device the sound should play through.
* @param sinkId - The sink of the device to play sound through.
*/
AudioPlayer.prototype.setSinkId = function (sinkId) {
return tslib.__awaiter(this, void 0, void 0, function () {
return tslib.__generator(this, function (_a) {
switch (_a.label) {
case 0:
if (typeof this._audioElement.setSinkId !== 'function') {
throw new Error('This browser does not support setSinkId.');
}
if (sinkId === this.sinkId) {
return [2 /*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 [2 /*return*/];
}
return [4 /*yield*/, this._audioElement.setSinkId(sinkId)];
case 1:
_a.sent();
if (this._audioElement.srcObject) {
return [2 /*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);
return [2 /*return*/];
}
});
});
};
/**
* Create a Deferred for a Promise that will be resolved when .src is set or rejected
* when .pause is called.
*/
AudioPlayer.prototype._createPlayDeferred = function () {
var deferred$1 = new deferred.default();
this._pendingPlayDeferreds.push(deferred$1);
return deferred$1;
};
/**
* Stop current playback and load a sound file.
* @param src - The source URL of the file to load
*/
AudioPlayer.prototype._load = function (src) {
var _this = this;
if (this._src && this._src !== src) {
this.pause();
}
this._src = src;
this._bufferPromise = new Promise(function (resolve, reject) { return tslib.__awaiter(_this, void 0, void 0, function () {
var buffer;
return tslib.__generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!src) {
return [2 /*return*/, this._createPlayDeferred().promise];
}
return [4 /*yield*/, bufferSound(this._audioContext, this._XMLHttpRequest, src)];
case 1:
buffer = _a.sent();
this.dispatchEvent('canplaythrough');
resolve(buffer);
return [2 /*return*/];
}
});
}); });
};
/**
* Reject all deferreds for the Play promise.
* @param reason
*/
AudioPlayer.prototype._rejectPlayDeferreds = function (reason) {
var deferreds = this._pendingPlayDeferreds;
deferreds.splice(0, deferreds.length).forEach(function (_a) {
var reject = _a.reject;
return reject(reason);
});
};
/**
* Resolve all deferreds for the Play promise.
* @param result
*/
AudioPlayer.prototype._resolvePlayDeferreds = function (result) {
var deferreds = this._pendingPlayDeferreds;
deferreds.splice(0, deferreds.length).forEach(function (_a) {
var resolve = _a.resolve;
return resolve(result);
});
};
return AudioPlayer;
}(eventtarget.default));
/**
* 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 tslib.__awaiter(this, void 0, void 0, function () {
var request, event;
return tslib.__generator(this, function (_a) {
switch (_a.label) {
case 0:
request = new RequestFactory();
request.open('GET', src, true);
request.responseType = 'arraybuffer';
return [4 /*yield*/, new Promise(function (resolve) {
request.addEventListener('load', resolve);
request.send();
})];
case 1:
event = _a.sent();
// Safari uses a callback here instead of a Promise.
try {
return [2 /*return*/, context.decodeAudioData(event.target.response)];
}
catch (e) {
return [2 /*return*/, new Promise(function (resolve) {
context.decodeAudioData(event.target.response, resolve);
})];
}
return [2 /*return*/];
}
});
});
}
exports.default = AudioPlayer;
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