Add advanced audio settings

autoGainControl, echoCancellation, and noiseSuppression are audio
processing options that are usually enabled by default on WebRTC input
tracks.

This commits adds the possibility to enable/disable them, as they can be
undesirable in some cases (audiophile use cases). For example, one might
want to stream electronic dance music, which is basically noise, so it
should not be suppressed in that specific case.

Signed-off-by: László Várady <laszlo.varady@protonmail.com>

src/MediaDeviceHandler.ts

@@ -17,6 +17,7 @@ limitations under the License.
 
 import EventEmitter from 'events';
 import { logger } from "matrix-js-sdk/src/logger";
+import { AudioSettings } from "matrix-js-sdk/src/webrtc/mediaHandler";
 
 import SettingsStore from "./settings/SettingsStore";
 import { SettingLevel } from "./settings/SettingLevel";
@@ -38,6 +39,8 @@ export enum MediaDeviceHandlerEvent {
 export default class MediaDeviceHandler extends EventEmitter {
     private static internalInstance;
 
+    private audioSettings: AudioSettings;
+
     public static get instance(): MediaDeviceHandler {
         if (!MediaDeviceHandler.internalInstance) {
             MediaDeviceHandler.internalInstance = new MediaDeviceHandler();
@@ -78,6 +81,20 @@ export default class MediaDeviceHandler extends EventEmitter {
 
         await MatrixClientPeg.get().getMediaHandler().setAudioInput(audioDeviceId);
         await MatrixClientPeg.get().getMediaHandler().setVideoInput(videoDeviceId);
+        await MatrixClientPeg.get().getMediaHandler().setAudioSettings(MediaDeviceHandler.loadAudioSettings());
+    }
+
+    private static loadAudioSettings(): AudioSettings {
+        return {
+            autoGainControl: SettingsStore.getValue("webRtcAudio_autoGainControl"),
+            echoCancellation: SettingsStore.getValue("webRtcAudio_echoCancellation"),
+            noiseSuppression: SettingsStore.getValue("webRtcAudio_noiseSuppression"),
+        };
+    }
+
+    public constructor() {
+        super();
+        this.audioSettings = MediaDeviceHandler.loadAudioSettings();
     }
 
     public setAudioOutput(deviceId: string): void {
@@ -113,6 +130,31 @@ export default class MediaDeviceHandler extends EventEmitter {
         }
     }
 
+    public async setAudioAutoGainControl(value: boolean): Promise<void> {
+        this.audioSettings.autoGainControl = value;
+        SettingsStore.setValue("webRtcAudio_autoGainControl", null, SettingLevel.DEVICE, value);
+
+        await MatrixClientPeg.get().getMediaHandler().setAudioSettings(this.audioSettings);
+    }
+
+    public async setAudioEchoCancellation(value: boolean): Promise<void> {
+        this.audioSettings.echoCancellation = value;
+        SettingsStore.setValue("webRtcAudio_echoCancellation", null, SettingLevel.DEVICE, value);
+
+        await MatrixClientPeg.get().getMediaHandler().setAudioSettings(this.audioSettings);
+    }
+
+    public async setAudioNoiseSuppression(value: boolean): Promise<void> {
+        this.audioSettings.noiseSuppression = value;
+        SettingsStore.setValue("webRtcAudio_noiseSuppression", null, SettingLevel.DEVICE, value);
+
+        await MatrixClientPeg.get().getMediaHandler().setAudioSettings(this.audioSettings);
+    }
+
+    public getAudioSettings(): AudioSettings {
+        return this.audioSettings;
+    }
+
     public static getAudioOutput(): string {
         return SettingsStore.getValueAt(SettingLevel.DEVICE, "webrtc_audiooutput");
     }

src/components/views/settings/tabs/user/VoiceUserSettingsTab.tsx

@@ -17,6 +17,7 @@ limitations under the License.
 
 import React from 'react';
 import { logger } from "matrix-js-sdk/src/logger";
+import { AudioSettings } from "matrix-js-sdk/src/webrtc/mediaHandler";
 
 import { _t } from "../../../../../languageHandler";
 import SdkConfig from "../../../../../SdkConfig";
@@ -27,6 +28,7 @@ import { MatrixClientPeg } from "../../../../../MatrixClientPeg";
 import Modal from "../../../../../Modal";
 import { SettingLevel } from "../../../../../settings/SettingLevel";
 import SettingsFlag from '../../../elements/SettingsFlag';
+import LabelledToggleSwitch from "../../../elements/LabelledToggleSwitch";
 import ErrorDialog from '../../../dialogs/ErrorDialog';
 
 const getDefaultDevice = (devices: Array<Partial<MediaDeviceInfo>>) => {
@@ -43,6 +45,7 @@ const getDefaultDevice = (devices: Array<Partial<MediaDeviceInfo>>) => {
 
 interface IState extends Record<MediaDeviceKindEnum, string> {
     mediaDevices: IMediaDevices;
+    audioSettings: AudioSettings;
 }
 
 export default class VoiceUserSettingsTab extends React.Component<{}, IState> {
@@ -54,6 +57,7 @@ export default class VoiceUserSettingsTab extends React.Component<{}, IState> {
             [MediaDeviceKindEnum.AudioOutput]: null,
             [MediaDeviceKindEnum.AudioInput]: null,
             [MediaDeviceKindEnum.VideoInput]: null,
+            audioSettings: MediaDeviceHandler.instance.getAudioSettings(),
         };
     }
 
@@ -79,6 +83,10 @@ export default class VoiceUserSettingsTab extends React.Component<{}, IState> {
         }
     };
 
+    private async refreshAudioSettings(): Promise<void> {
+        this.setState({ audioSettings: MediaDeviceHandler.instance.getAudioSettings() });
+    }
+
     private requestMediaPermissions = async (): Promise<void> => {
         let constraints;
         let stream;
@@ -197,6 +205,30 @@ export default class VoiceUserSettingsTab extends React.Component<{}, IState> {
 
                 <div className="mx_SettingsTab_heading">{ _t("Advanced") }</div>
                 <div className="mx_SettingsTab_section">
+                    <span className="mx_SettingsTab_subheading">{ _t("Voice processing") }</span>
+                    <div className="mx_SettingsTab_section">
+                        <LabelledToggleSwitch
+                            value={this.state.audioSettings.autoGainControl}
+                            onChange={(v) => {
+                                MediaDeviceHandler.instance.setAudioAutoGainControl(v); this.refreshAudioSettings();
+                            }}
+                            label={_t("Automatic gain control")}
+                        />
+                        <LabelledToggleSwitch
+                            value={this.state.audioSettings.echoCancellation}
+                            onChange={(v) => {
+                                MediaDeviceHandler.instance.setAudioEchoCancellation(v); this.refreshAudioSettings();
+                            }}
+                            label={_t("Echo cancellation")}
+                        />
+                        <LabelledToggleSwitch
+                            value={this.state.audioSettings.noiseSuppression}
+                            onChange={(v) => {
+                                MediaDeviceHandler.instance.setAudioNoiseSuppression(v); this.refreshAudioSettings();
+                            }}
+                            label={_t("Noise suppression")}
+                        />
+                    </div>
                     <div className="mx_SettingsTab_section">
                         <span className="mx_SettingsTab_subheading">{ _t("Connection") }</span>
                         <SettingsFlag

src/i18n/strings/en_EN.json

@@ -1552,6 +1552,10 @@
     "Voice & Video": "Voice & Video",
     "Voice settings": "Voice settings",
     "Video settings": "Video settings",
+    "Voice processing": "Voice processing",
+    "Automatic gain control": "Automatic gain control",
+    "Echo cancellation": "Echo cancellation",
+    "Noise suppression": "Noise suppression",
     "Connection": "Connection",
     "This room is not accessible by remote Matrix servers": "This room is not accessible by remote Matrix servers",
     "<b>Warning</b>: Upgrading a room will <i>not automatically migrate room members to the new version of the room.</i> We'll post a link to the new room in the old version of the room - room members will have to click this link to join the new room.": "<b>Warning</b>: Upgrading a room will <i>not automatically migrate room members to the new version of the room.</i> We'll post a link to the new room in the old version of the room - room members will have to click this link to join the new room.",

src/i18n/strings/en_US.json

@@ -13,6 +13,10 @@
     "Advanced": "Advanced",
     "Voice settings": "Voice settings",
     "Video settings": "Video settings",
+    "Voice processing": "Voice processing",
+    "Automatic gain control": "Automatic gain control",
+    "Echo cancellation": "Echo cancellation",
+    "Noise suppression": "Noise suppression",
     "Connection": "Connection",
     "Always show message timestamps": "Always show message timestamps",
     "Authentication": "Authentication",

src/i18n/strings/hu.json

@@ -706,6 +706,10 @@
     "Voice & Video": "Hang és videó",
     "Voice settings": "Hangbeállítások",
     "Video settings": "Videóbeállítások",
+    "Voice processing": "Hangfeldolgozás",
+    "Automatic gain control": "Automatikus erősségszabályozás",
+    "Echo cancellation": "Visszhangcsökkentés",
+    "Noise suppression": "Zajcsökkentés",
     "Connection": "Kapcsolat",
     "Main address": "Fő cím",
     "Room avatar": "Szoba képe",

src/settings/Settings.tsx

@@ -645,6 +645,21 @@ export const SETTINGS: {[setting: string]: ISetting} = {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
         default: "default",
     },
+    "webRtcAudio_autoGainControl": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        displayName: _td("Automatic gain control"),
+        default: true,
+    },
+    "webRtcAudio_echoCancellation": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        displayName: _td("Echo cancellation"),
+        default: true,
+    },
+    "webRtcAudio_noiseSuppression": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        displayName: _td("Noise suppression"),
+        default: true,
+    },
     "language": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG,
         default: "en",