import { IMediaEngineImpl } from '../impl/IAgoraMediaEngineImpl';
import { IAudioFrameObserver, IVideoEncodedFrameObserver, IVideoFrameObserver } from '../AgoraMediaBase';
export declare class MediaEngineInternal extends IMediaEngineImpl {
    static _audio_frame_observers: IAudioFrameObserver[];
    static _video_frame_observers: IVideoFrameObserver[];
    static _video_encoded_frame_observers: IVideoEncodedFrameObserver[];
    registerAudioFrameObserver(observer: IAudioFrameObserver): number;
    unregisterAudioFrameObserver(observer: IAudioFrameObserver): number;
    registerVideoFrameObserver(observer: IVideoFrameObserver): number;
    unregisterVideoFrameObserver(observer: IVideoFrameObserver): number;
    registerVideoEncodedFrameObserver(observer: IVideoEncodedFrameObserver): number;
    unregisterVideoEncodedFrameObserver(observer: IVideoEncodedFrameObserver): number;
    release(): void;
}