fis_lib_vid/lib/image_fetcher/native.dart

import 'dart:typed_data';

import 'package:fis_common/logger/logger.dart';
import 'package:fis_vid/cache/io.dart';
import 'package:fis_vid/common/vid_download.dart';
import 'package:vid/us/vid_us_image.dart';
import 'package:vid/us/vid_us_image_data.dart';

import 'base.dart';

class VidImageFetcher extends VidImageFetcherBase {
  VidFileDownloadCancelToken? _downloadCancelToken;

  VidImageFetcher(String url) : super(url);

  @override
  Future<VidUsImage?> innerFetch() async {
    final vidBuffer = await _loadVidFile(url);
    if (vidBuffer != null) {
      final vidData = VidUsImageData(vidBuffer);
      final frame = vidData.getImage(0);
      return frame;
    }
    return null;
  }

  @override
  void dispose() {
    _downloadCancelToken?.cancel();
  }

  Future<Uint8List?> _loadVidFile(String url) async {
    final cachedFile = await VidNativeCache.ins.getCache(url);
    if (cachedFile != null) return cachedFile;

    _downloadCancelToken = VidFileDownloadCancelToken();
    final buffer = await VidFileDownloader.download(
      url,
      cancelToken: _downloadCancelToken,
    );
    if (buffer != null) {
      await VidNativeCache.ins.saveCache(url, buffer);
    }
    return buffer;
  }
}