import { AudioEncodedFrame, VideoEncodedFrame, ILiveRTMP } from '../interface/index';
/**
 * responsibility
 * - 音视频帧时间戳管理
 * - 音视频都存在时，等到接受到视频帧时才开始处理
 *
 */
export default class AVSync {
    _core: ILiveRTMP;
    _videoFrameGot: boolean;
    _videoBaseDts: number;
    _audioBaseDts: number;
    _videoNextDts: number;
    _videoLastDts: number;
    _audioNextDts: number;
    _lastVideoReceived: number;
    get avExist(): boolean;
    get videoRefDuration(): number;
    get audioRefDuration(): number;
    constructor(core: ILiveRTMP);
    addVideoFrame(frame: VideoEncodedFrame): {
        size: number;
        duration: number;
        key: boolean;
    };
    addAudioFrame(frame: AudioEncodedFrame): {
        size: number;
        duration: number;
    } | undefined;
}