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VoiceFocusTransformDevice.ts
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VoiceFocusTransformDevice.ts
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
import { AGCOptions, VoiceFocusAudioWorkletNode } from '../../libs/voicefocus/types';
import { NodeArguments, VoiceFocus } from '../../libs/voicefocus/voicefocus';
import AudioMixObserver from '../audiomixobserver/AudioMixObserver';
import AudioVideoFacade from '../audiovideofacade/AudioVideoFacade';
import DefaultBrowserBehavior from '../browserbehavior/DefaultBrowserBehavior';
import AudioNodeSubgraph from '../devicecontroller/AudioNodeSubgraph';
import type AudioTransformDevice from '../devicecontroller/AudioTransformDevice';
import type Device from '../devicecontroller/Device';
import VoiceFocusTransformDeviceDelegate from './VoiceFocusTransformDeviceDelegate';
import VoiceFocusTransformDeviceObserver from './VoiceFocusTransformDeviceObserver';
/**
* A device that augments a {@link Device} to apply Amazon Voice Focus
* noise suppression to an audio input.
*/
class VoiceFocusTransformDevice implements AudioTransformDevice, AudioMixObserver {
/** @internal */
constructor(
private device: Device,
private voiceFocus: VoiceFocus,
private delegate: VoiceFocusTransformDeviceDelegate,
private nodeOptions: NodeArguments,
private failed: boolean = false,
private node: VoiceFocusAudioWorkletNode | undefined = undefined,
private browserBehavior: DefaultBrowserBehavior = new DefaultBrowserBehavior(),
/** farEndStreams` maps from a stream that could cause echo or interfere with double talkto an `AudioSourceNode` that we use to mix multiple such streams.*/
private farEndStreamToAudioSourceNode: Map<
MediaStream,
MediaStreamAudioSourceNode | null
> = new Map(),
/** mixDestNode is the Audio Destination Node where farEndStreams got mixed into one stream.*/
private mixDestNode: MediaStreamAudioDestinationNode | undefined = undefined,
/** mixSourceNode is the Audio Source Node where the stream out of mixDestNode got transferred into Audio Worklet Node for processing.*/
private mixSourceNode: MediaStreamAudioSourceNode | undefined = undefined
) {}
/**
* Return the inner device as provided during construction, or updated via
* {@link VoiceFocusTransformDevice.chooseNewInnerDevice}. Do not confuse
* this method with {@link VoiceFocusTransformDevice.intrinsicDevice}.
*/
getInnerDevice(): Device {
return this.device;
}
/**
* Disable the audio node while muted to reduce CPU usage.
*
* @param muted whether the audio device should be muted.
*/
async mute(muted: boolean): Promise<void> {
if (!this.node) {
return;
}
if (muted) {
await this.node.disable();
} else {
await this.node.enable();
}
}
/**
* Dispose of the inner workings of the transform device. After this method is called
* you will need to create a new device to use Amazon Voice Focus again.
*/
async stop(): Promise<void> {
if (!this.node) {
return;
}
this.node.disconnect();
await this.node.stop();
}
/**
* If you wish to choose a different inner device, but continue to use Amazon Voice Focus, you
* can use this method to efficiently create a new device that will reuse
* the same internal state. Only one of the two devices can be used at a time: switch
* between them using {@link DeviceController.startAudioInput}.
*
* If the same device is passed as is currently in use, `this` is returned.
*
* @param inner The new inner device to use.
*/
async chooseNewInnerDevice(inner: Device): Promise<VoiceFocusTransformDevice> {
// If the new device is 'default', always recreate. Chrome can switch out
// the real device underneath us.
if (this.device === inner && !isDefaultDevice(inner)) {
return this;
}
return new VoiceFocusTransformDevice(
inner,
this.voiceFocus,
this.delegate,
this.nodeOptions,
this.failed,
this.node,
this.browserBehavior,
this.farEndStreamToAudioSourceNode,
this.mixDestNode,
this.mixSourceNode
);
}
async intrinsicDevice(): Promise<Device> {
if (this.failed) {
return this.device;
}
const isUsingES = this.nodeOptions.es;
// Turn the Device into constraints with appropriate AGC settings.
const trackConstraints: MediaTrackConstraints = {
echoCancellation: !isUsingES,
// @ts-ignore
googEchoCancellation: !isUsingES,
// @ts-ignore
googEchoCancellation2: !isUsingES,
noiseSuppression: false,
// @ts-ignore
googNoiseSuppression: false,
// @ts-ignore
googHighpassFilter: false,
// @ts-ignore
googNoiseSuppression2: false,
};
let useBuiltInAGC;
if (this.nodeOptions && this.nodeOptions.agc !== undefined) {
useBuiltInAGC = this.nodeOptions.agc.useBuiltInAGC;
} else {
useBuiltInAGC = true;
}
trackConstraints.autoGainControl = useBuiltInAGC;
// @ts-ignore
trackConstraints.googAutoGainControl = useBuiltInAGC;
// @ts-ignore
trackConstraints.googAutoGainControl2 = useBuiltInAGC;
// Empty string and null.
if (!this.device) {
return trackConstraints;
}
// Device ID.
if (typeof this.device === 'string') {
/* istanbul ignore if */
if (this.browserBehavior.requiresNoExactMediaStreamConstraints()) {
trackConstraints.deviceId = this.device;
} else {
trackConstraints.deviceId = { exact: this.device };
}
return trackConstraints;
}
// It's a stream.
if ((this.device as MediaStream).id) {
// Nothing we can do.
return this.device;
}
// It's constraints.
return {
...this.device,
...trackConstraints,
};
}
async createAudioNode(context: AudioContext): Promise<AudioNodeSubgraph> {
if (this.node?.context === context) {
return {
start: this.node,
end: this.node,
};
}
const agc: AGCOptions = { useVoiceFocusAGC: false };
const options = {
enabled: true,
agc,
...this.nodeOptions,
};
try {
this.node?.disconnect();
this.node = await this.voiceFocus.createNode(context, options);
if (this.nodeOptions.es) {
this.mixDestNode = new MediaStreamAudioDestinationNode(context, {
channelCount: 1,
channelCountMode: 'explicit',
});
for (const stream of this.farEndStreamToAudioSourceNode.keys()) {
this.assignFarEndStreamToAudioSourceNode(stream);
}
this.createMixSourceNode();
}
const start = this.node;
const end = this.node;
return { start, end };
} catch (e) {
// It's better to return some audio stream than nothing.
this.failed = true;
this.delegate.onFallback(this, e);
throw e;
}
}
async observeMeetingAudio(audioVideo: AudioVideoFacade): Promise<void> {
if (!this.nodeOptions.es) {
return;
}
audioVideo.addAudioMixObserver(this);
const stream = await audioVideo.getCurrentMeetingAudioStream();
if (stream) {
this.addFarEndStream(stream);
}
}
async unObserveMeetingAudio(audioVideo: AudioVideoFacade): Promise<void> {
if (!this.nodeOptions.es) {
return;
}
audioVideo.removeAudioMixObserver(this);
const stream = await audioVideo.getCurrentMeetingAudioStream();
if (stream) {
this.removeFarendStream(stream);
}
}
/**
* Add an observer to receive notifications about Amazon Voice Focus lifecycle events.
* See {@link VoiceFocusTransformDeviceObserver} for details.
* If the observer has already been added, this method call has no effect.
*/
addObserver(observer: VoiceFocusTransformDeviceObserver): void {
this.delegate.addObserver(observer);
}
/**
* Remove an existing observer. If the observer has not been previously {@link
* VoiceFocusTransformDevice.addObserver|added}, this method call has no effect.
*/
removeObserver(observer: VoiceFocusTransformDeviceObserver): void {
this.delegate.removeObserver(observer);
}
async addFarEndStream(activeStream: MediaStream | null): Promise<void> {
if (
!this.nodeOptions.es ||
!activeStream ||
this.farEndStreamToAudioSourceNode.has(activeStream)
) {
return;
}
if (this.node) {
this.assignFarEndStreamToAudioSourceNode(activeStream);
} else {
this.farEndStreamToAudioSourceNode.set(activeStream, null);
}
}
async removeFarendStream(inactiveStream: MediaStream): Promise<void> {
this.farEndStreamToAudioSourceNode.get(inactiveStream)?.disconnect();
this.farEndStreamToAudioSourceNode.delete(inactiveStream);
}
async meetingAudioStreamBecameActive(activeStream: MediaStream | null): Promise<void> {
this.addFarEndStream(activeStream);
}
async meetingAudioStreamBecameInactive(inactiveStream: MediaStream): Promise<void> {
this.removeFarendStream(inactiveStream);
}
private assignFarEndStreamToAudioSourceNode(streamToAdd: MediaStream): void {
const streamNodeToAdd = (this.node.context as AudioContext).createMediaStreamSource(
streamToAdd
);
streamNodeToAdd.channelCount = 1;
streamNodeToAdd.channelCountMode = 'explicit';
this.farEndStreamToAudioSourceNode.set(streamToAdd, streamNodeToAdd);
streamNodeToAdd.connect(this.mixDestNode, 0);
}
private createMixSourceNode(): void {
this.mixSourceNode = (this.node.context as AudioContext).createMediaStreamSource(
this.mixDestNode.stream
);
this.mixSourceNode.channelCount = 1;
this.mixSourceNode.channelCountMode = 'explicit';
this.mixSourceNode.connect(this.node, 0, 1);
}
}
function isDefaultDevice(device: Device): boolean {
if (device === 'default') {
return true;
}
if (!device || typeof device !== 'object') {
return false;
}
if ('deviceId' in device && device.deviceId === 'default') {
return true;
}
if ('id' in device && device.id === 'default') {
return true;
}
return false;
}
export default VoiceFocusTransformDevice;