import { HMSInternalEvent } from '../events/HMSInternalEvent';
import { HMSLocalAudioTrack } from '../internal';
export interface ITrackAudioLevelUpdate {
    track: HMSLocalAudioTrack;
    audioLevel: number;
}
export declare class TrackAudioLevelMonitor {
    private track;
    private audioLevelEvent;
    private silenceEvent;
    private readonly TAG;
    private audioLevel;
    private analyserNode?;
    private isMonitored;
    /** Frequency of polling audio level from track */
    private interval;
    /** Store past audio levels for this duration */
    private historyInterval;
    private history;
    constructor(track: HMSLocalAudioTrack, audioLevelEvent: HMSInternalEvent<ITrackAudioLevelUpdate>, silenceEvent: HMSInternalEvent<{
        track: HMSLocalAudioTrack;
    }>);
    /**
     * To detect silence we check if the track is unmuted and silent in the current moment
     * periodically. If the track is found to be silent more than a threshold number of times
     * we send the event. The threshold number of time is there to reduce the chance of false
     * positives.
     */
    detectSilence: () => Promise<void>;
    start(): void;
    stop(): void;
    private loop;
    private sendAudioLevel;
    private getMaxAudioLevelOverPeriod;
    private calculateAudioLevel;
    private isSilentThisInstant;
    private createAnalyserNodeForStream;
}