怎样实现一个自定义播放器？

@Component
export struct VideoPlayer{
    //控制器
  private controller:VideoController | undefined;
  //封面图
  private previewUris: Resource = $r ('app.media.aa');
  //本地的视频文件
  private innerResource: Resource = $rawfile('test.mp4');
  build(){
    Column() {
      Video({
        src: this.innerResource,
        previewUri: this.previewUris,
        controller: this.controller
      })
    }
  }
}