fis_lib_vid/lib/data_channel/channel.dart

import 'package:fis_vid/async_vid/vid_data.dart';
import 'package:flutter/foundation.dart';
import 'package:vid/us/vid_us_image.dart';

abstract class VidDataChannel {
  late final AsyncVidImageDataBase _source;

  /// 开始加载数据
  Future<bool> load() async {
    try {
      _source = await buildSource();
      await _source.initialize();
      return true;
    } catch (e) {
      return false;
    }
  }

  /// 获取指定帧
  ///
  /// [index] 帧索引
  Future<VidUsImage> getImage(int index) async {
    return _source.getImage(index);
  }

  @protected
  Future<AsyncVidImageDataBase> buildSource();
}