import { MediaClip } from '../clips/tav-media-clip';
import { ScaleMode } from '../types/types';
import { TAVSurface } from './tav-surface';
/**
 * A video reader is used to obtain the video frames of a media.
 * @category Engine
 */
export declare class TAVVideoReader {
    private ref;
    private static dispatcher;
    /**
     * Make a video reader from a media clip.
     * @param root The root media clip.
     * @param frameRate The frame rate of the video reader.
     * @param isRecycle
     * @returns New video reader.
     */
    static MakeFrom(root: MediaClip, frameRate: number, isRecycle?: boolean): Promise<TAVVideoReader>;
    private surface;
    private constructor();
    /**
     * Set the surface to render the video frames.
     * @param surface The surface to render the video.
     */
    setSurface(surface: TAVSurface): Promise<void>;
    /**
     * Sets the current frame to the specified time.
     * @param targetTime The target time to seek to.
     * @returns seeked or not.
     */
    seekTo(targetTime: number): Promise<boolean>;
    /**
     * Reads the next video frame for the output.
     */
    readNextFrame(): Promise<void>;
    /**
     * Returns the current scale mode.
     */
    scaleMode(): ScaleMode;
    /**
     * Specifies the rule of how to scale the content to fit the surface size. The matrix
     * changes when this method is called.
     * @param mode The scale mode.
     */
    setScaleMode(mode: ScaleMode): void;
    release(): void;
}