import IEncoder from './IEncoder';
import { OnFrameCallback } from './Types';
import WorkerBase from './WorkerBase';
export default class LibVPxEncoder extends WorkerBase implements IEncoder {
    private readonly _sourceTrack;
    private readonly _onFrame;
    private readonly _useCongestionControl;
    private readonly _maxBitrate;
    private readonly _useImageCapture;
    private _video;
    private _imageCapture;
    private _canvas;
    private _canvasCtx;
    private _frameReadTimeout;
    private _lastFrame;
    constructor(sourceTrack: MediaStreamTrack, onFrame: OnFrameCallback, useCongestionControl: boolean, maxBitrate: number);
    private _createDom;
    private _removeDom;
    private _createStream;
    private _removeStream;
    private _drawFrameVideo;
    private _getFrameBitmap;
    private _drawFrameData;
    init(): Promise<void>;
    private _encode;
    private _requestFrameVideo;
    private _requestFrameBitmap;
    requestFrame(keyFrame?: boolean): void;
    setBitrate(bitrate: number, useCbr: boolean, fps: number): void;
    isVP9(): boolean;
    destroy(): void;
}