import EnhancedEventEmitter from "../EnhancedEventEmitter";
import { AudioSourceState } from "../types";
export declare const audioContext: AudioContext;
export declare const FFT_SIZE = 2048;
export declare const BUFFER_SIZE = 4096;
export declare const BUFFER_SAMPLE_RATE: number;
export declare class AudioManager extends EnhancedEventEmitter {
    audioSource: MediaStreamAudioSourceNode | AudioBufferSourceNode | MediaElementAudioSourceNode | null;
    analyserNode: AnalyserNode;
    /**
     * 输出经过 WebAudio 处理后的 MediaSteam 对象
     */
    audioStream: MediaStreamAudioDestinationNode;
    gainNode: GainNode;
    scriptNode: ScriptProcessorNode;
    /**
     * 接受 PCM 数据回调
     */
    audioBufferCallback?: (buffer: AudioBuffer) => any;
    audioBufferSize?: number;
    audioSourceState: AudioSourceState;
    /**
     * 如果输入源是 AudioBufferSourceNode，这里存储了原始的 Buffer
     */
    private audioSourceBuffer?;
    /**
     * 如果输入源是 MediaElementSourceBuffer，这里存储了原始的媒体元素
     */
    private audioSourceElement?;
    private audioSourceLoop?;
    private _audioSourceState;
    private bufferSourceDuration;
    constructor();
    initAudioContext(): void;
    setMediaStreamSource(originMediaStream: MediaStream): void;
    setAudioBufferSource(): void;
    setMediaElementSource(mediaElement: HTMLAudioElement): void;
    setAudioSourceLoop(isLoop: boolean): void;
    setAudioBuffer(data: AudioBuffer): void;
    playAudioSource(offset?: number): void;
    resumeAudioSource(): void;
    pauseAudioSource(): void;
    stopAudioSource(useToSeek?: boolean): void;
    getAudioSourceCurrentTime(): number;
    setAudioSourceCurrentTime(val: number): void;
    getAudioSourceDuration(): number;
    release(): void;
    private connect;
    private handleAudioBuffer;
    private onAudioBuffer;
    private handleMediaElementEvents;
    private resetBufferSourceDuration;
}