@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
530 lines • 40.5 kB
JavaScript
/**
* @packageDocumentation
* @module Voice
*/
import { EventEmitter } from 'events';
import Device from './device';
import { InvalidArgumentError, NotSupportedError } from './errors';
import Log from './log';
import OutputDeviceCollection from './outputdevicecollection';
import MediaDeviceInfoShim from './shims/mediadeviceinfo';
import getMediaDevicesInstance from './shims/mediadevices';
import { average, difference, isFirefox } from './util';
/**
* Aliases for audio kinds, used for labelling.
* @private
*/
const kindAliases = {
audioinput: 'Audio Input',
audiooutput: 'Audio Output',
};
/**
* Provides input and output audio-based functionality in one convenient class.
* @publicapi
*/
class AudioHelper extends EventEmitter {
/**
* @constructor
* @private
* @param onActiveOutputsChanged - A callback to be called when the user changes the active output devices.
* @param onActiveInputChanged - A callback to be called when the user changes the active input device.
* @param getUserMedia - The getUserMedia method to use.
* @param [options]
*/
constructor(onActiveOutputsChanged, onActiveInputChanged, getUserMedia, options) {
super();
/**
* A Map of all audio input devices currently available to the browser by their device ID.
*/
this.availableInputDevices = new Map();
/**
* A Map of all audio output devices currently available to the browser by their device ID.
*/
this.availableOutputDevices = new Map();
/**
* The currently set audio constraints set by setAudioConstraints().
*/
this._audioConstraints = null;
/**
* Whether each sound is enabled.
*/
this._enabledSounds = {
[Device.SoundName.Disconnect]: true,
[Device.SoundName.Incoming]: true,
[Device.SoundName.Outgoing]: true,
};
/**
* The current input device.
*/
this._inputDevice = null;
/**
* The current input stream.
*/
this._inputStream = null;
/**
* Whether the {@link AudioHelper} is currently polling the input stream's volume.
*/
this._isPollingInputVolume = false;
/**
* An instance of Logger to use.
*/
this._log = Log.getInstance();
/**
* A record of unknown devices (Devices without labels)
*/
this._unknownDeviceIndexes = {
audioinput: {},
audiooutput: {},
};
/**
* Remove an input device from inputs
* @param lostDevice
* @returns Whether the device was active
*/
this._removeLostInput = (lostDevice) => {
if (!this.inputDevice || this.inputDevice.deviceId !== lostDevice.deviceId) {
return false;
}
this._replaceStream(null);
this._inputDevice = null;
this._maybeStopPollingVolume();
const defaultDevice = this.availableInputDevices.get('default')
|| Array.from(this.availableInputDevices.values())[0];
if (defaultDevice) {
this.setInputDevice(defaultDevice.deviceId);
}
return true;
};
/**
* Remove an input device from outputs
* @param lostDevice
* @returns Whether the device was active
*/
this._removeLostOutput = (lostDevice) => {
const wasSpeakerLost = this.speakerDevices.delete(lostDevice);
const wasRingtoneLost = this.ringtoneDevices.delete(lostDevice);
return wasSpeakerLost || wasRingtoneLost;
};
/**
* Update the available input and output devices
*/
this._updateAvailableDevices = () => {
if (!this._mediaDevices || !this._enumerateDevices) {
return Promise.reject('Enumeration not supported');
}
return this._enumerateDevices().then((devices) => {
this._updateDevices(devices.filter((d) => d.kind === 'audiooutput'), this.availableOutputDevices, this._removeLostOutput);
this._updateDevices(devices.filter((d) => d.kind === 'audioinput'), this.availableInputDevices, this._removeLostInput);
const defaultDevice = this.availableOutputDevices.get('default')
|| Array.from(this.availableOutputDevices.values())[0];
[this.speakerDevices, this.ringtoneDevices].forEach(outputDevices => {
if (!outputDevices.get().size && this.availableOutputDevices.size && this.isOutputSelectionSupported) {
outputDevices.set(defaultDevice.deviceId)
.catch((reason) => {
this._log.warn(`Unable to set audio output devices. ${reason}`);
});
}
});
});
};
options = Object.assign({
AudioContext: typeof AudioContext !== 'undefined' && AudioContext,
setSinkId: typeof HTMLAudioElement !== 'undefined' && HTMLAudioElement.prototype.setSinkId,
}, options);
this._getUserMedia = getUserMedia;
this._mediaDevices = options.mediaDevices || getMediaDevicesInstance();
this._onActiveInputChanged = onActiveInputChanged;
this._enumerateDevices = typeof options.enumerateDevices === 'function'
? options.enumerateDevices
: this._mediaDevices && this._mediaDevices.enumerateDevices;
const isAudioContextSupported = !!(options.AudioContext || options.audioContext);
const isEnumerationSupported = !!this._enumerateDevices;
if (options.enabledSounds) {
this._enabledSounds = options.enabledSounds;
}
const isSetSinkSupported = typeof options.setSinkId === 'function';
this.isOutputSelectionSupported = isEnumerationSupported && isSetSinkSupported;
this.isVolumeSupported = isAudioContextSupported;
if (this.isVolumeSupported) {
this._audioContext = options.audioContext || options.AudioContext && new options.AudioContext();
if (this._audioContext) {
this._inputVolumeAnalyser = this._audioContext.createAnalyser();
this._inputVolumeAnalyser.fftSize = 32;
this._inputVolumeAnalyser.smoothingTimeConstant = 0.3;
}
}
this.ringtoneDevices = new OutputDeviceCollection('ringtone', this.availableOutputDevices, onActiveOutputsChanged, this.isOutputSelectionSupported);
this.speakerDevices = new OutputDeviceCollection('speaker', this.availableOutputDevices, onActiveOutputsChanged, this.isOutputSelectionSupported);
this.addListener('newListener', (eventName) => {
if (eventName === 'inputVolume') {
this._maybeStartPollingVolume();
}
});
this.addListener('removeListener', (eventName) => {
if (eventName === 'inputVolume') {
this._maybeStopPollingVolume();
}
});
this.once('newListener', () => {
// NOTE (rrowland): Ideally we would only check isEnumerationSupported here, but
// in at least one browser version (Tested in FF48) enumerateDevices actually
// returns bad data for the listed devices. Instead, we check for
// isOutputSelectionSupported to avoid these quirks that may negatively affect customers.
if (!this.isOutputSelectionSupported) {
this._log.warn('Warning: This browser does not support audio output selection.');
}
if (!this.isVolumeSupported) {
this._log.warn(`Warning: This browser does not support Twilio's volume indicator feature.`);
}
});
if (isEnumerationSupported) {
this._initializeEnumeration();
}
}
/**
* The currently set audio constraints set by setAudioConstraints(). Starts as null.
*/
get audioConstraints() { return this._audioConstraints; }
/**
* The active input device. Having no inputDevice specified by `setInputDevice()`
* will disable input selection related functionality.
*/
get inputDevice() { return this._inputDevice; }
/**
* The current input stream.
*/
get inputStream() { return this._inputStream; }
/**
* Current state of the enabled sounds
* @private
*/
_getEnabledSounds() {
return this._enabledSounds;
}
/**
* Start polling volume if it's supported and there's an input stream to poll.
* @private
*/
_maybeStartPollingVolume() {
if (!this.isVolumeSupported || !this._inputStream) {
return;
}
this._updateVolumeSource();
if (this._isPollingInputVolume || !this._inputVolumeAnalyser) {
return;
}
const bufferLength = this._inputVolumeAnalyser.frequencyBinCount;
const buffer = new Uint8Array(bufferLength);
this._isPollingInputVolume = true;
const emitVolume = () => {
if (!this._isPollingInputVolume) {
return;
}
if (this._inputVolumeAnalyser) {
this._inputVolumeAnalyser.getByteFrequencyData(buffer);
const inputVolume = average(buffer);
this.emit('inputVolume', inputVolume / 255);
}
requestAnimationFrame(emitVolume);
};
requestAnimationFrame(emitVolume);
}
/**
* Stop polling volume if it's currently polling and there are no listeners.
* @private
*/
_maybeStopPollingVolume() {
if (!this.isVolumeSupported) {
return;
}
if (!this._isPollingInputVolume || (this._inputStream && this.listenerCount('inputVolume'))) {
return;
}
if (this._inputVolumeSource) {
this._inputVolumeSource.disconnect();
delete this._inputVolumeSource;
}
this._isPollingInputVolume = false;
}
/**
* Unbind the listeners from mediaDevices.
* @private
*/
_unbind() {
if (!this._mediaDevices || !this._enumerateDevices) {
throw new NotSupportedError('Enumeration is not supported');
}
if (this._mediaDevices.removeEventListener) {
this._mediaDevices.removeEventListener('devicechange', this._updateAvailableDevices);
this._mediaDevices.removeEventListener('deviceinfochange', this._updateAvailableDevices);
}
}
/**
* Enable or disable the disconnect sound.
* @param doEnable Passing `true` will enable the sound and `false` will disable the sound.
* Not passing this parameter will not alter the enable-status of the sound.
* @returns The enable-status of the sound.
*/
disconnect(doEnable) {
return this._maybeEnableSound(Device.SoundName.Disconnect, doEnable);
}
/**
* Enable or disable the incoming sound.
* @param doEnable Passing `true` will enable the sound and `false` will disable the sound.
* Not passing this parameter will not alter the enable-status of the sound.
* @returns The enable-status of the sound.
*/
incoming(doEnable) {
return this._maybeEnableSound(Device.SoundName.Incoming, doEnable);
}
/**
* Enable or disable the outgoing sound.
* @param doEnable Passing `true` will enable the sound and `false` will disable the sound.
* Not passing this parameter will not alter the enable-status of the sound.
* @returns The enable-status of the sound.
*/
outgoing(doEnable) {
return this._maybeEnableSound(Device.SoundName.Outgoing, doEnable);
}
/**
* Set the MediaTrackConstraints to be applied on every getUserMedia call for new input
* device audio. Any deviceId specified here will be ignored. Instead, device IDs should
* be specified using {@link AudioHelper#setInputDevice}. The returned Promise resolves
* when the media is successfully reacquired, or immediately if no input device is set.
* @param audioConstraints - The MediaTrackConstraints to apply.
*/
setAudioConstraints(audioConstraints) {
this._audioConstraints = Object.assign({}, audioConstraints);
delete this._audioConstraints.deviceId;
return this.inputDevice
? this._setInputDevice(this.inputDevice.deviceId, true)
: Promise.resolve();
}
/**
* Replace the current input device with a new device by ID.
* @param deviceId - An ID of a device to replace the existing
* input device with.
*/
setInputDevice(deviceId) {
return !isFirefox()
? this._setInputDevice(deviceId, false)
: Promise.reject(new NotSupportedError('Firefox does not currently support opening multiple ' +
'audio input tracks simultaneously, even across different tabs. As a result, ' +
'Device.audio.setInputDevice is disabled on Firefox until support is added.\n' +
'Related BugZilla thread: https://bugzilla.mozilla.org/show_bug.cgi?id=1299324'));
}
/**
* Unset the MediaTrackConstraints to be applied on every getUserMedia call for new input
* device audio. The returned Promise resolves when the media is successfully reacquired,
* or immediately if no input device is set.
*/
unsetAudioConstraints() {
this._audioConstraints = null;
return this.inputDevice
? this._setInputDevice(this.inputDevice.deviceId, true)
: Promise.resolve();
}
/**
* Unset the input device, stopping the tracks. This should only be called when not in a connection, and
* will not allow removal of the input device during a live call.
*/
unsetInputDevice() {
if (!this.inputDevice) {
return Promise.resolve();
}
return this._onActiveInputChanged(null).then(() => {
this._replaceStream(null);
this._inputDevice = null;
this._maybeStopPollingVolume();
});
}
/**
* Get the index of an un-labeled Device.
* @param mediaDeviceInfo
* @returns The index of the passed MediaDeviceInfo
*/
_getUnknownDeviceIndex(mediaDeviceInfo) {
const id = mediaDeviceInfo.deviceId;
const kind = mediaDeviceInfo.kind;
let index = this._unknownDeviceIndexes[kind][id];
if (!index) {
index = Object.keys(this._unknownDeviceIndexes[kind]).length + 1;
this._unknownDeviceIndexes[kind][id] = index;
}
return index;
}
/**
* Initialize output device enumeration.
*/
_initializeEnumeration() {
if (!this._mediaDevices || !this._enumerateDevices) {
throw new NotSupportedError('Enumeration is not supported');
}
if (this._mediaDevices.addEventListener) {
this._mediaDevices.addEventListener('devicechange', this._updateAvailableDevices);
this._mediaDevices.addEventListener('deviceinfochange', this._updateAvailableDevices);
}
this._updateAvailableDevices().then(() => {
if (!this.isOutputSelectionSupported) {
return;
}
Promise.all([
this.speakerDevices.set('default'),
this.ringtoneDevices.set('default'),
]).catch(reason => {
this._log.warn(`Warning: Unable to set audio output devices. ${reason}`);
});
});
}
/**
* Set whether the sound is enabled or not
* @param soundName
* @param doEnable
* @returns Whether the sound is enabled or not
*/
_maybeEnableSound(soundName, doEnable) {
if (typeof doEnable !== 'undefined') {
this._enabledSounds[soundName] = doEnable;
}
return this._enabledSounds[soundName];
}
/**
* Stop the tracks on the current input stream before replacing it with the passed stream.
* @param stream - The new stream
*/
_replaceStream(stream) {
if (this._inputStream) {
this._inputStream.getTracks().forEach(track => {
track.stop();
});
}
this._inputStream = stream;
}
/**
* Replace the current input device with a new device by ID.
* @param deviceId - An ID of a device to replace the existing
* input device with.
* @param forceGetUserMedia - If true, getUserMedia will be called even if
* the specified device is already active.
*/
_setInputDevice(deviceId, forceGetUserMedia) {
if (typeof deviceId !== 'string') {
return Promise.reject(new InvalidArgumentError('Must specify the device to set'));
}
const device = this.availableInputDevices.get(deviceId);
if (!device) {
return Promise.reject(new InvalidArgumentError(`Device not found: ${deviceId}`));
}
if (this._inputDevice && this._inputDevice.deviceId === deviceId && this._inputStream) {
if (!forceGetUserMedia) {
return Promise.resolve();
}
// If the currently active track is still in readyState `live`, gUM may return the same track
// rather than returning a fresh track.
this._inputStream.getTracks().forEach(track => {
track.stop();
});
}
const constraints = { audio: Object.assign({ deviceId: { exact: deviceId } }, this.audioConstraints) };
return this._getUserMedia(constraints).then((stream) => {
return this._onActiveInputChanged(stream).then(() => {
this._replaceStream(stream);
this._inputDevice = device;
this._maybeStartPollingVolume();
});
});
}
/**
* Update a set of devices.
* @param updatedDevices - An updated list of available Devices
* @param availableDevices - The previous list of available Devices
* @param removeLostDevice - The method to call if a previously available Device is
* no longer available.
*/
_updateDevices(updatedDevices, availableDevices, removeLostDevice) {
const updatedDeviceIds = updatedDevices.map(d => d.deviceId);
const knownDeviceIds = Array.from(availableDevices.values()).map(d => d.deviceId);
const lostActiveDevices = [];
// Remove lost devices
const lostDeviceIds = difference(knownDeviceIds, updatedDeviceIds);
lostDeviceIds.forEach((lostDeviceId) => {
const lostDevice = availableDevices.get(lostDeviceId);
if (lostDevice) {
availableDevices.delete(lostDeviceId);
if (removeLostDevice(lostDevice)) {
lostActiveDevices.push(lostDevice);
}
}
});
// Add any new devices, or devices with updated labels
let deviceChanged = false;
updatedDevices.forEach(newDevice => {
const existingDevice = availableDevices.get(newDevice.deviceId);
const newMediaDeviceInfo = this._wrapMediaDeviceInfo(newDevice);
if (!existingDevice || existingDevice.label !== newMediaDeviceInfo.label) {
availableDevices.set(newDevice.deviceId, newMediaDeviceInfo);
deviceChanged = true;
}
});
if (deviceChanged || lostDeviceIds.length) {
// Force a new gUM in case the underlying tracks of the active stream have changed. One
// reason this might happen is when `default` is selected and set to a USB device,
// then that device is unplugged or plugged back in. We can't check for the 'ended'
// event or readyState because it is asynchronous and may take upwards of 5 seconds,
// in my testing. (rrowland)
if (this.inputDevice !== null && this.inputDevice.deviceId === 'default') {
this._log.warn(`Calling getUserMedia after device change to ensure that the \
tracks of the active device (default) have not gone stale.`);
this._setInputDevice(this.inputDevice.deviceId, true);
}
this.emit('deviceChange', lostActiveDevices);
}
}
/**
* Disconnect the old input volume source, and create and connect a new one with the current
* input stream.
*/
_updateVolumeSource() {
if (!this._inputStream || !this._audioContext || !this._inputVolumeAnalyser) {
return;
}
if (this._inputVolumeSource) {
this._inputVolumeSource.disconnect();
}
try {
this._inputVolumeSource = this._audioContext.createMediaStreamSource(this._inputStream);
this._inputVolumeSource.connect(this._inputVolumeAnalyser);
}
catch (ex) {
this._log.warn('Unable to update volume source', ex);
delete this._inputVolumeSource;
}
}
/**
* Convert a MediaDeviceInfo to a IMediaDeviceInfoShim.
* @param mediaDeviceInfo - The info to convert
* @returns The converted shim
*/
_wrapMediaDeviceInfo(mediaDeviceInfo) {
const options = {
deviceId: mediaDeviceInfo.deviceId,
groupId: mediaDeviceInfo.groupId,
kind: mediaDeviceInfo.kind,
label: mediaDeviceInfo.label,
};
if (!options.label) {
if (options.deviceId === 'default') {
options.label = 'Default';
}
else {
const index = this._getUnknownDeviceIndex(mediaDeviceInfo);
options.label = `Unknown ${kindAliases[options.kind]} Device ${index}`;
}
}
return new MediaDeviceInfoShim(options);
}
}
(function (AudioHelper) {
})(AudioHelper || (AudioHelper = {}));
export default AudioHelper;
//# 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