feat(player): 增加进度条拖动画面预览
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// Author: fruit.com.cn
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import 'dart:async';
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import 'dart:typed_data';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:fruitshorts/core/data/services/playback_thumbnail_service.dart';
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void main() {
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test('should_bucket_thumbnail_requests_by_whole_seconds', () {
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expect(playbackThumbnailBucket(Duration.zero), 0);
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expect(playbackThumbnailBucket(const Duration(milliseconds: 1999)), 1);
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expect(playbackThumbnailBucket(const Duration(seconds: 12)), 12);
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expect(playbackThumbnailBucket(const Duration(milliseconds: -300)), 0);
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});
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test('should_return_injected_frame_from_loader', () async {
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final loader = _RecordingLoader((_) async => ByteData(1));
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final frame = await loader.load(
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const PlaybackThumbnailFrameRequest(
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episodeId: 'episode',
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position: Duration(seconds: 1),
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source: PlaybackThumbnailSource(remoteUrl: 'https://example/video.mp4'),
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),
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);
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expect(frame, isNotNull);
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});
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test('should_evict_least_recently_used_frame_after_24_entries', () async {
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final loader = _RecordingLoader((_) async => ByteData(1));
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final service = _service(loader);
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addTearDown(service.dispose);
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for (var second = 0; second < 25; second++) {
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final frame = await service.thumbnail(
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'episode',
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Duration(seconds: second),
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);
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expect(
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frame,
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isNotNull,
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reason: 'bucket $second loader=${loader.buckets}',
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);
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}
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expect(service.cacheSize, 24);
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expect(loader.buckets.first, 0);
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await service.thumbnail('episode', const Duration(seconds: 1));
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expect(loader.buckets.where((bucket) => bucket == 1), hasLength(1));
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await service.thumbnail('episode', Duration.zero);
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expect(loader.buckets.where((bucket) => bucket == 0), hasLength(2));
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});
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test('should_coalesce_same_bucket_while_frame_is_in_flight', () async {
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final frame = Completer<ByteData?>();
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final loader = _RecordingLoader((_) => frame.future);
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final service = _service(loader);
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addTearDown(service.dispose);
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final first = service.thumbnail('episode', const Duration(seconds: 8));
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await Future<void>.delayed(Duration.zero);
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final second = service.thumbnail(
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'episode',
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const Duration(milliseconds: 8999),
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);
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expect(identical(first, second), isTrue);
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expect(loader.buckets, [8]);
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frame.complete(ByteData(2));
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expect(await first, isNotNull);
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expect(await second, isNotNull);
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});
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test('should_drop_superseded_request_and_start_latest_bucket', () async {
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final frames = <int, Completer<ByteData?>>{};
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final loader = _RecordingLoader((request) {
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final completer = Completer<ByteData?>();
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frames[request.position.inSeconds] = completer;
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return completer.future;
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});
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final service = _service(loader);
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addTearDown(service.dispose);
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final stale = service.thumbnail('episode', const Duration(seconds: 4));
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await Future<void>.delayed(Duration.zero);
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final latest = service.thumbnail('episode', const Duration(seconds: 9));
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await Future<void>.delayed(Duration.zero);
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expect(loader.buckets, [4]);
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frames[4]!.complete(ByteData(4));
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expect(await stale, isNull);
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await Future<void>.delayed(Duration.zero);
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expect(loader.buckets, [4, 9]);
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frames[9]!.complete(ByteData(9));
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expect(await latest, isNotNull);
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});
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test('should_cancel_unstarted_request_when_scrub_ends', () async {
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final firstFrame = Completer<ByteData?>();
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final loader = _RecordingLoader((request) {
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if (request.position.inSeconds == 3) return firstFrame.future;
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return Future<ByteData?>.value(ByteData(7));
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});
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final service = _service(loader);
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addTearDown(service.dispose);
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final active = service.thumbnail('episode', const Duration(seconds: 3));
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await Future<void>.delayed(Duration.zero);
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final pending = service.thumbnail('episode', const Duration(seconds: 7));
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service.cancelPending();
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expect(await pending, isNull);
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firstFrame.complete(ByteData(3));
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expect(await active, isNull);
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await Future<void>.delayed(Duration.zero);
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expect(loader.buckets, [3]);
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});
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test('should_prefetch_one_neighbor_after_scrub_pause', () async {
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final loader = _RecordingLoader((_) async => ByteData(1));
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final service = _service(
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loader,
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prefetchDelay: const Duration(milliseconds: 10),
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);
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addTearDown(service.dispose);
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await service.thumbnail('episode', const Duration(seconds: 5));
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expect(loader.buckets, [5]);
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await Future<void>.delayed(const Duration(milliseconds: 5));
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expect(loader.buckets, [5]);
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await Future<void>.delayed(const Duration(milliseconds: 12));
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expect(loader.buckets, [5, 6]);
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});
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test('should_not_prefetch_over_newer_unstarted_bucket', () async {
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final frames = <int, Completer<ByteData?>>{};
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final loader = _RecordingLoader((request) {
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final completer = Completer<ByteData?>();
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frames[request.position.inSeconds] = completer;
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return completer.future;
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});
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final service = _service(
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loader,
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prefetchDelay: const Duration(milliseconds: 10),
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);
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addTearDown(service.dispose);
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final first = service.thumbnail('episode', const Duration(seconds: 1));
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await Future<void>.delayed(Duration.zero);
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final latest = service.thumbnail('episode', const Duration(seconds: 3));
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await Future<void>.delayed(const Duration(milliseconds: 20));
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expect(loader.buckets, [1]);
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frames[1]!.complete(ByteData(1));
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expect(await first, isNull);
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await Future<void>.delayed(Duration.zero);
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expect(loader.buckets, [1, 3]);
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frames[3]!.complete(ByteData(3));
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expect(await latest, isNotNull);
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});
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test('should_return_null_once_then_negative_cache_failed_bucket', () async {
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final loader = _RecordingLoader((_) => Completer<ByteData?>().future);
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final service = _service(
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loader,
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requestTimeout: const Duration(milliseconds: 10),
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);
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addTearDown(service.dispose);
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expect(
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await service.thumbnail('episode', const Duration(seconds: 2)),
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isNull,
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);
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expect(
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await service.thumbnail('episode', const Duration(seconds: 2)),
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isNull,
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);
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expect(loader.buckets, [2]);
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});
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test('should_convert_loader_exception_to_null', () async {
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final loader = _RecordingLoader((_) async => throw StateError('decode'));
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final service = _service(loader);
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addTearDown(service.dispose);
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expect(
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await service.thumbnail('episode', const Duration(seconds: 6)),
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isNull,
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);
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});
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}
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PlaybackThumbnailService _service(
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PlaybackThumbnailFrameLoader loader, {
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Duration requestTimeout = const Duration(hours: 1),
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Duration prefetchDelay = const Duration(hours: 1),
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}) {
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return PlaybackThumbnailService(
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frameLoader: loader,
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sourceResolver: (_) =>
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const PlaybackThumbnailSource(remoteUrl: 'https://example/video.mp4'),
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requestTimeout: requestTimeout,
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prefetchDelay: prefetchDelay,
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);
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}
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class _RecordingLoader implements PlaybackThumbnailFrameLoader {
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_RecordingLoader(this._handler);
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final Future<ByteData?> Function(PlaybackThumbnailFrameRequest request)
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_handler;
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final List<int> buckets = [];
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@override
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Future<ByteData?> load(PlaybackThumbnailFrameRequest request) {
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buckets.add(request.position.inSeconds);
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return _handler(request);
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}
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@override
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void dispose() {}
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}
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