/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the Microsoft Live Share SDK License.
 */
import { IMediaPlayer } from "./IMediaPlayer";
export declare enum LimitLevelType {
    fixed = 0,
    percentage = 1
}
/**
 * Smooth audio level changes when volume is modified, or if volume limiting has started/ended.
 */
export declare class VolumeManager {
    private readonly _player;
    private readonly _volumeChangeDuration;
    private _volume;
    private _isLimiting;
    private _limitLevel;
    private _limitLevelType;
    private _startTime;
    private _startVolume;
    private _running;
    constructor(player: IMediaPlayer);
    /**
     * The selected volume.
     *
     * @remarks
     * Expressed as a value between 0.0 and 1.0. The default value is 1.0.
     * Can be used for things like volume sliders.
     *
     * Does not return the current volume if limiting is enabled, but the desired volume.
     */
    get volume(): number;
    set volume(value: number);
    /**
     * Target level to lower volume to.
     *
     * @remarks
     * Expressed as a value between 0.0 and 1.0. The value is applied based upon the configured
     * `levelType`. The default value is 0.1.
     *
     * For a level type of `LevelType.fixed` the value is the exact level the volume will be
     * lowered to. The default value of 0.1 would cause the volume to be lowered to 0.1.
     *
     * For a level type of `LevelType.percentage` the value is the percentage by which the volume
     * level should be lowered to. The default value of 0.1 would cause the volume to be lowered
     * to 10% of its starting value.
     */
    get limitLevel(): number;
    set limitLevel(value: number);
    /**
     * The type of level represented by the `limitLevel` property.
     */
    get limitLevelType(): LimitLevelType;
    set limitLevelType(value: LimitLevelType);
    /**
     * Amount of time, in seconds, it should take to change the volume up or down to the desired level.
     *
     * @remarks
     * Default `volumeChangeDuration` is 0.5 seconds.
     */
    get volumeChangeDuration(): number;
    set volumeChangeDuration(value: number);
    /**
     * Whether or not volume limiting is currently enabled.
     */
    get isLimiting(): boolean;
    /**
     * Limits volume based on `limitLevel` and `limitLevelType` properties.
     * @see `limitLevel`
     * @see `limitLevelType`
     */
    startLimiting(): void;
    /**
     * Disables volume limit.
     */
    stopLimiting(): void;
    private startAdjusting;
    private scheduleAnimationFrame;
    private computeInterpolatedVolume;
    private computeTargetVolume;
    private millisSinceVolumeChangeStart;
}
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