openvidu-components: Subscribe to STT when captions opened

openvidu-components-angular/projects/openvidu-angular/src/lib/components/captions/captions.component.ts

@@ -51,6 +51,7 @@ export class CaptionsComponent implements OnInit {
 	session: Session;
 
 	private deleteTimeout: NodeJS.Timeout;
+	private deleteAllTimeout: NodeJS.Timeout;
 
 	private DELETE_TIMEOUT = 5 * 1000;
 	private MAX_EVENTS_LIMIT = 3;
@@ -67,16 +68,29 @@ export class CaptionsComponent implements OnInit {
 		private cd: ChangeDetectorRef
 	) {}
 
-	ngOnInit(): void {
+	async ngOnInit(): Promise<void> {
+		this.captionService.setCaptionsEnabled(true);
 		this.captionLangSelected = this.captionService.getLangSelected();
 		this.session = this.openviduService.getWebcamSession();
 
+		for (const p of this.participantService.getRemoteParticipants()) {
+			const stream = p.getCameraConnection().streamManager.stream;
+			await this.session.subscribeToSpeechToText(stream, this.captionLangSelected.ISO);
+		}
+
 		this.subscribeToCaptionLanguage();
 		this.subscribeToPanelToggling();
 		this.subscribeToTranscription();
 	}
 
-	ngOnDestroy() {
+	async ngOnDestroy() {
+		this.captionService.setCaptionsEnabled(false);
+
+		for (const p of this.participantService.getRemoteParticipants()) {
+			const stream = p.getCameraConnection().streamManager.stream;
+			await this.session.unsubscribeFromSpeechToText(stream);
+		}
+
 		if (this.screenSizeSub) this.screenSizeSub.unsubscribe();
 		if (this.panelTogglingSubscription) this.panelTogglingSubscription.unsubscribe();
 		this.session.off('speechToTextMessage');
@@ -89,6 +103,7 @@ export class CaptionsComponent implements OnInit {
 
 	private subscribeToTranscription() {
 		this.session.on('speechToTextMessage', (event: SpeechToTextEvent) => {
+			clearInterval(this.deleteAllTimeout);
 			const { connectionId, data } = event.connection;
 			const nickname: string = this.participantService.getNicknameFromConnectionData(data);
 			const color = this.participantService.getRemoteParticipantByConnectionId(connectionId)?.colorProfile || '';
@@ -101,6 +116,8 @@ export class CaptionsComponent implements OnInit {
 				type: event.reason
 			};
 			this.updateCaption(caption);
+			// Delete all events when there are no more events for a period of time
+			this.deleteAllEventsAfterDelay(this.DELETE_TIMEOUT);
 			this.cd.markForCheck();
 		});
 	}
@@ -127,7 +144,7 @@ export class CaptionsComponent implements OnInit {
 						clearInterval(this.deleteTimeout);
 					}
 					captionEventsCopy.push(caption);
-					this.deleteEventAfterDelay(this.DELETE_TIMEOUT);
+					this.deleteFirstEventAfterDelay(this.DELETE_TIMEOUT);
 				} else {
 					lastCaption.text = caption.text;
 					lastCaption.type = caption.type;
@@ -139,7 +156,7 @@ export class CaptionsComponent implements OnInit {
 					clearInterval(this.deleteTimeout);
 				}
 				captionEventsCopy.push(caption);
-				this.deleteEventAfterDelay(this.DELETE_TIMEOUT);
+				this.deleteFirstEventAfterDelay(this.DELETE_TIMEOUT);
 			}
 		}
 
@@ -147,13 +164,20 @@ export class CaptionsComponent implements OnInit {
 		this.scrollToBottom();
 	}
 
-	private deleteEventAfterDelay(timeout: number) {
+	private deleteFirstEventAfterDelay(timeout: number) {
 		this.deleteTimeout = setTimeout(() => {
 			this.captionEvents.shift();
 			this.cd.markForCheck();
 		}, timeout);
 	}
 
+	private deleteAllEventsAfterDelay(timeout: number) {
+		this.deleteAllTimeout = setTimeout(() => {
+			this.captionEvents = [];
+			this.cd.markForCheck();
+		}, timeout);
+	}
+
 	private subscribeToCaptionLanguage() {
 		this.captionLanguageSubscription = this.captionService.captionLangObs.subscribe((lang) => {
 			this.captionLangSelected = lang;

openvidu-components-angular/projects/openvidu-angular/src/lib/components/session/session.component.ts

@@ -315,7 +315,7 @@ export class SessionComponent implements OnInit, OnDestroy {
 				this.participantService.addRemoteConnection(connectionId, data, subscriber);
 				// this.oVSessionService.sendNicknameSignal(event.stream.connection);
 
-				if (this.participantService.getTypeConnectionData(data) === VideoType.CAMERA) {
+				if (this.captionService.areCaptionsEnabled() && this.participantService.getTypeConnectionData(data) === VideoType.CAMERA) {
 					// Only subscribe to STT when stream is CAMERA type and it is a remote stream
 					try {
 						await this.session.subscribeToSpeechToText(event.stream, this.captionService.getLangSelected().ISO);
@@ -331,10 +331,12 @@ export class SessionComponent implements OnInit, OnDestroy {
 		this.session.on('streamDestroyed', async (event: StreamEvent) => {
 			const connectionId = event.stream.connection.connectionId;
 			this.participantService.removeConnectionByConnectionId(connectionId);
-			try {
-				await this.session.unsubscribeFromSpeechToText(event.stream);
-			} catch (error) {
-				this.log.e('Error unsubscribing from STT: ', error);
+			if(this.captionService.areCaptionsEnabled()){
+				try {
+					await this.session.unsubscribeFromSpeechToText(event.stream);
+				} catch (error) {
+					this.log.e('Error unsubscribing from STT: ', error);
+				}
 			}
 		});
 	}

openvidu-components-angular/projects/openvidu-angular/src/lib/services/caption/caption.service.ts

@@ -9,6 +9,7 @@ import { StorageService } from '../storage/storage.service';
 	providedIn: 'root'
 })
 export class CaptionService {
+
 	private langTitles = [
 		{ name: 'English', ISO: 'en-US' },
 		{ name: 'Español', ISO: 'es-ES' },
@@ -23,6 +24,7 @@ export class CaptionService {
 	captionLangSelected: { name: string; ISO: string };
 	captionLangObs: Observable<{ name: string; ISO: string }>;
 	private _captionLangObs: Subject<{ name: string; ISO: string }> = new Subject();
+	private captionsEnabled: boolean = false;
 
 	constructor(private storageService: StorageService) {
 		const iso = this.storageService.getCaptionsLang();
@@ -32,6 +34,14 @@ export class CaptionService {
 		this.captionLangObs = this._captionLangObs.asObservable();
 	}
 
+	setCaptionsEnabled(value: boolean) {
+		this.captionsEnabled = value;
+	}
+
+	areCaptionsEnabled(): boolean {
+		return this.captionsEnabled;
+	}
+
 	setLanguage(lang: string) {
 		if (this.langTitles.some((l) => l.ISO === lang)) {
 			this.captionLangSelected = this.langTitles.find((l) => l.ISO === lang);