fis_lib_vid/lib/data_host/web/shell.dart

part of 'data_host.dart';

class _VidDataHostShell implements VidDataHostInterface {
  _VidDataHostShell(this.url);

  static PlatformService get _platform => VidDataHostEnv.platformGetter!.call();

  VidUsImageData? _data;

  @override
  final String url;

  @override
  int get frameCount => _data == null ? -1 : _data!.imageCount;

  @override
  VidUsProbe get probe => _data!.probe;

  @override
  Future<VidUsImageData?> getData() async => _data;

  @override
  Future<VidDataHostLoadInfo?> load() async {
    final rst = await getVidFile(url);

    if (rst == null || rst.isEmpty) return null;

    final buffer = const Base64Decoder().convert(rst);
    _data = VidUsImageData(buffer);

    final info = VidDataHostLoadInfo(_data!.probe);
    return info;
  }

  ///获取vid文件
  Future<String?> getVidFile(String url, {int times = 0}) async {
    try {
      return await _platform.getVidFile(url);
    } catch (e) {
      logger.e('_VidDataHostShell load $times ex:', e);
      if (times < 2) {
        return await getVidFile(url, times: times++);
      }
      return null;
    }
  }

  @override
  Future<VidUsImage?> getFrame(int index) async => _data?.getImage(index);

  @override
  Future<void> release() async {
    _data = null;
  }
}