export declare const VOICE_AUDIO_CONSTRAINTS: MediaTrackConstraints;
export declare class AudioLevelMonitor {
    private readonly context;
    private readonly analyser;
    private readonly source;
    private readonly samples;
    private readonly stream;
    private readonly ownsStream;
    private readonly onLevel;
    private frame;
    private lastSampleAt;
    private stopped;
    private constructor();
    static capture(onLevel: (level: number) => void): Promise<AudioLevelMonitor>;
    static fromStream(stream: MediaStream, onLevel: (level: number) => void): AudioLevelMonitor;
    stop(): void;
    private readonly sample;
}
export declare function audioLevelFromTimeDomain(samples: Uint8Array): number;