import EventEmitter from "wolfy87-eventemitter";
import { AudioMixingTrack } from "../stream/audiomixingtrack";
import { AudioSourceTrack } from "../stream";
import { AudioPlaybackEngine } from "./playback";
export interface AudioMusicOption {
    loop: boolean;
    volume: number;
}
export declare class AudioMusicManager extends EventEmitter {
    musicOption: AudioMusicOption;
    musicTrack?: AudioSourceTrack;
    private output;
    private playbackEngine;
    constructor(output: AudioMixingTrack, playbackEngine: AudioPlaybackEngine);
    /**
     * 更新背景音乐混音的各种参数，支持在混音中途更新
     * @param option Partical<AudioMusicOption>
     */
    setMusicOption(option: Partial<AudioMusicOption>): void;
    /**
     * 开始音乐混音
     * @param source 音乐的源文件，支持本地文件对象或者在线音乐地址
     */
    startMusicMixing(source: string | File | AudioBuffer): Promise<void>;
    /**
     * 暂停音乐混音
     */
    pauseMusicMixing(): void;
    /**
     * 恢复音乐混音
     */
    resumeMusicMixing(): void;
    /**
     * 停止音乐混音
     */
    stopMusicMixing(): void;
    getMusicDuration(): number;
    getMusicCurrentTime(): number;
    setMusicCurrentTime(currentTime: number): void;
}