import { AudioMixingTrack } from "../stream/audiomixingtrack";
import { AudioSourceTrack } from "../stream";
import { AudioPlaybackEngine } from "./playback";
export declare class AudioEffectManager {
    /** @inrernal */
    effectSourceMap: Map<string, AudioSourceTrack>;
    /** @inrernal */
    playback: boolean;
    private output;
    private playbackEngine;
    constructor(output: AudioMixingTrack, playbackEngine: AudioPlaybackEngine);
    readonly effectList: string[];
    getEffectTrack(key: string): AudioSourceTrack | undefined;
    playEffect(key: string, volume?: number): void;
    /**
     * 添加音效
     * @param source 音效的源文件，支持本地 File 文件或者在线音乐地址
     * @param key 音效的 key，每个音效需要指定一个唯一的 key，用于之后调用
     */
    addEffectSource(source: string | File, key: string): Promise<void>;
    /**
     * 移除并释放已经添加的音效
     * @param key 指定音效的 key，如果不指定默认删除全部的音效
     */
    removeEffectSource(key?: string): void;
}