import { IProcessTrack, XYContentPreserverOptions } from './index.type';
import { XYContentPreserverExtension } from './index';
import { XYProcessorIF } from '../../../interface/processor.type';
export declare class XYContentPreserverProcessor implements XYProcessorIF {
    private canvas;
    private canvasContext;
    private options;
    private enablePlugin;
    private trackWidth;
    private trackHeight;
    private trackGenerator;
    private pluginInstance;
    private isPause;
    private cacheBitmap;
    private isCacheCanvas;
    private cacheVideoTrack;
    private transformController;
    private detectInterval;
    private createLastVideoFrame;
    private isProcessorEnded;
    private debounceDelay;
    private detectIntervalGap;
    constructor(config: XYContentPreserverOptions | undefined, pluginInstance: XYContentPreserverExtension);
    getProcessorType(): import('./index.type').PluginType;
    /**
     * 销毁处理器实例
     *
     * 使用场景：当不再需要内容快照处理器时，调用此方法清理资源
     * 调用时机：处理器实例需要销毁时
     */
    destroy(): void;
    /**
     * 清除检测定时器
     */
    private clearDetectInterval;
    /**
     * 初始化离线画布
     */
    private initOfflineCanvas;
    /**
     * 移除选项
     */
    removeOptions(): void;
    /**
     * 设置选项
     *
     * @param { XYContentPreserverOptions } option - 插件配置项
     * @returns { Promise<boolean> } - 返回Promise对象
     */
    setOptions(option?: XYContentPreserverOptions): Promise<boolean>;
    /**
     * 启用插件
     *
     * @returns { Promise<boolean> } - 返回Promise对象
     */
    enable(): Promise<boolean>;
    /**
     * 禁用插件
     *
     * @returns { Promise<boolean> } - 返回Promise对象
     */
    disable(): Promise<boolean>;
    /**
     * 获取插件状态
     */
    getEnablePluginState(): boolean;
    /**
     * 暂停处理器
     */
    pause(): void;
    /**
     * 恢复处理器
     */
    resume(): void;
    /**
     * 当TransformStream freeze触发时，启动定时器接管转换流，每隔1000ms进行补帧操作
     */
    private createLastVideoFrameWrap;
    /**
     * 从视频轨道创建视频帧
     *
     * @return { Promise<XYLastFrameData> } - 返回最后一帧视频帧数据和读取器
     */
    private createVideoFrameFromVideoTrack;
    /**
     * 清除并缓存新的视频轨道
     *
     * @param { MediaStreamTrack } track - 视频轨道
     */
    private clearAndCacheVideoTrack;
    /**
     * 处理视频流
     *
     * @param { IProcessTrack } processTrack - 处理视频流
     * @returns { Promise<IProcessTrack> } - 返回加工处理过后的 MediaStreamTrack 轨道数据
     */
    process(processTrack: IProcessTrack): Promise<IProcessTrack>;
    /**
     * 转换视频流
     *
     * @param { VideoFrame } videoFrame - 视频帧
     * @param { TransformStreamDefaultController<VideoFrame> } controller - 转换流控制器
     */
    transformStream(videoFrame: VideoFrame, controller: TransformStreamDefaultController<VideoFrame>): Promise<void>;
    /**
     * 创建下一个视频帧
     *
     * @param { number } videoTimestamp - 视频帧时间戳
     */
    private createNextVideoFrame;
    /**
     * 创建暂停内容快照
     */
    private createContentPreserver;
    /**
     * 创建缓存位图
     */
    private createCacheBitmap;
    /**
     * 处理视频帧，将视频帧绘制到离线画布上
     */
    private addVideoEffectToFrame;
    /**
     * 清除离线画布
     */
    private clearRect;
}