export declare class AudioService {
    private readonly onMark;
    private readonly onPlaying;
    private readonly onFinished;
    private audio;
    private queue;
    private stopped;
    private activeItem;
    private mediaSource;
    private sourceBuffer;
    private lastMarkIndex;
    private lastSentMarkIndex;
    private currentBackgroundAudio;
    constructor(options?: {
        onMark?: (markIndex: number) => void;
        onPlaying?: () => void;
        onFinished?: () => void;
    });
    private onAudioWaiting;
    private onAudioStalled;
    private onAudioPlaying;
    private onAudioEnded;
    private sendMark;
    private base64ToArrayBuffer;
    private onBufferUpdated;
    private updateSourceBuffer;
    play(): void;
    addChunk(base64Chunk: string, markIndex: number): void;
    private stopAudio;
    private startAudio;
    interrupt(): void;
    stop(): void;
    playBackgroundAudio(src: string): Promise<void>;
    stopBackgroundAudio(): void;
}
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