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

import { Injectable } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';
import { BackgroundEffect, EffectType } from '../../models/background-effect.model';
import { ParticipantService } from '../participant/participant.service';
import { TokenService } from '../token/token.service';

@Injectable({
	providedIn: 'root'
})
export class VirtualBackgroundService {
	backgroundSelected = <BehaviorSubject<string>>new BehaviorSubject('');
	backgroundSelectedObs: Observable<string>;
	backgrounds: BackgroundEffect[] = [
		{ id: 'no_effect', type: EffectType.NONE, thumbnail: 'block', description: 'No background effect' },
		{ id: 'soft_blur', type: EffectType.BLUR, thumbnail: 'blur_on', description: 'Blur effect' },
		{ id: '1', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-1.jpg', src: 'assets/backgrounds/bg-1.jpg' },
		{ id: '2', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-2.jpg', src: 'assets/backgrounds/bg-2.jpg' },
		{ id: '3', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-3.jpg', src: 'assets/backgrounds/bg-3.jpg' },
		{ id: '4', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-4.jpg', src: 'assets/backgrounds/bg-4.jpg' },
		{ id: '19', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-19.jpg', src: 'assets/backgrounds/bg-19.jpg' },
		{ id: '5', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-5.jpg', src: 'assets/backgrounds/bg-5.jpg' },
		{ id: '6', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-6.jpg', src: 'assets/backgrounds/bg-6.jpg' },
		{ id: '7', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-7.jpg', src: 'assets/backgrounds/bg-7.jpg' },
		{ id: '8', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-8.jpg', src: 'assets/backgrounds/bg-8.jpg' },
		{ id: '9', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-9.jpg', src: 'assets/backgrounds/bg-9.jpg' },
		{ id: '10', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-10.jpg', src: 'assets/backgrounds/bg-10.jpg' },
		{ id: '11', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-11.jpg', src: 'assets/backgrounds/bg-11.jpg' },
		{ id: '12', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-12.jpg', src: 'assets/backgrounds/bg-12.jpg' },
		{ id: '13', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-13.jpg', src: 'assets/backgrounds/bg-13.jpg' },
		{ id: '14', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-14.jpg', src: 'assets/backgrounds/bg-14.jpg' },
		{ id: '15', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-15.jpg', src: 'assets/backgrounds/bg-15.jpg' },
		{ id: '16', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-16.jpg', src: 'assets/backgrounds/bg-16.jpg' },
		{ id: '17', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-17.jpg', src: 'assets/backgrounds/bg-17.jpg' },
		{ id: '18', type: EffectType.IMAGE, thumbnail: 'assets/backgrounds/thumbnails/bg-18.jpg', src: 'assets/backgrounds/bg-18.jpg' }
	];

	constructor(private participantService: ParticipantService, private tokenService: TokenService) {
		this.backgroundSelectedObs = this.backgroundSelected.asObservable();
	}

	getBackgrounds(): any[] {
		return this.backgrounds;
	}

	async applyBackground(effect: BackgroundEffect) {
		if (effect.id !== this.backgroundSelected.getValue()) {
			const filter = this.participantService.getMyCameraPublisher().stream.filter;
			const isBackgroundSelected = !!filter && filter.type.startsWith('VB:');
			let options = { token: this.tokenService.getWebcamToken(), url: '' };
			if (effect.type === EffectType.IMAGE) {
				options.url = effect.src;
			}

			if (isBackgroundSelected && this.hasSameTypeAsAbove(effect.type)) {
				this.replaceBackground(effect);
			} else {
				await this.removeBackground();
				await this.participantService.getMyCameraPublisher().stream.applyFilter(`VB:${effect.type.toLowerCase()}`, options);
			}
			this.backgroundSelected.next(effect.id);
		}
	}

	async removeBackground() {
		if (!!this.backgroundSelected.getValue() && this.backgroundSelected.getValue() !== 'no_effect') {
			this.backgroundSelected.next('no_effect');
			await this.participantService.getMyCameraPublisher().stream.removeFilter();
		}
	}

	private async replaceBackground(effect: BackgroundEffect) {
		await this.participantService.getMyCameraPublisher().stream.filter.execMethod('update', { url: effect.src });
	}

	private hasSameTypeAsAbove(type: EffectType): boolean {
		const oldEffect = this.backgrounds.find((bg) => bg.id === this.backgroundSelected.getValue());
		return oldEffect?.type === type;
	}
}