import { RBEvent, Webinar, WebinarSessionParticipant } from '../../models';
import { WebinarConferenceService } from './webinarConference.service';
import { Subscription } from 'rxjs';
export declare enum WebinarAudioMixerEvents {
    STAGE_AUDIO_LEVEL_CHANGED = "STAGE_AUDIO_LEVEL_CHANGED",
    BACKSTAGE_AUDIO_LEVEL_CHANGED = "BACKSTAGE_AUDIO_LEVEL_CHANGED",
    AUDIO_BALANCE_CHANGED = "AUDIO_BALANCE_CHANGED"
}
export declare class WebinarAudioMixer {
    private webinarConferenceService;
    private mcuAudioElement?;
    private audioElements?;
    private sharingElements?;
    private logger;
    private deviceManagement;
    private audioMixerEvent;
    private webinarExtendedBackstage;
    backstageAudioLevel: number;
    stageAudioLevel: number;
    audioBalance: number;
    constructor(webinarConferenceService: WebinarConferenceService);
    private initialize;
    destroy(): void;
    subscribe(handler: (event: RBEvent<WebinarAudioMixerEvents>) => any, eventNames?: string | string[]): Subscription;
    sendEvent(event: WebinarAudioMixerEvents): void;
    addBackstageAudio(webinar: Webinar, webinarExtendeBackstage: boolean): Promise<void>;
    muteBackstage(webinar: Webinar, muted?: boolean): void;
    unmuteBackstage(webinar: Webinar): void;
    manageBackstageMic(webinar: Webinar, enabled: boolean): void;
    private createSilentAudioTrack;
    addAudioStream(webinar: Webinar, participant: WebinarSessionParticipant, type: 'audio' | 'sharing', videoType?: string): Promise<void>;
    removeAudioStream(participant: WebinarSessionParticipant, type: 'audio' | 'sharing' | 'all'): Promise<void>;
    mute(participant: WebinarSessionParticipant, type: 'audio' | 'sharing' | 'all', muted?: boolean): void;
    unmute(participant: WebinarSessionParticipant, type: 'audio' | 'sharing' | 'all'): void;
    activateAudio(): void;
    updateAudioDevice(): Promise<void>;
    private audioElemPlay;
    updateAudioLevelForParticipant(participant: WebinarSessionParticipant): void;
    setAudioBalance(volume: number): void;
    private setStageAudioLevel;
    private setBackstageAudioLevel;
    private setAudioLevel;
}
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