60 lines
1.9 KiB
Dart
60 lines
1.9 KiB
Dart
import 'dart:io';
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import 'package:flutter_cache_manager/flutter_cache_manager.dart';
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/// 与图片等分开的专用视频磁盘缓存（`flutter_cache_manager`）。
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final CacheManager funymeeVideoCacheManager = CacheManager(
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Config(
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'funymeeVideoCache',
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stalePeriod: const Duration(days: 14),
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maxNrOfCacheObjects: 200,
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),
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);
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/// 用 **scheme + host + path** 作缓存键，忽略 **query**（GCS 等签名参数每次变化，否则永远 cache miss）。
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/// 下载请求仍使用完整 [url]（含 query）。
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String videoCacheKeyForUrl(String url) {
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final raw = url.trim();
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final u = Uri.tryParse(raw);
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if (u == null || !u.hasScheme) return raw;
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if (u.scheme != 'http' && u.scheme != 'https') return raw;
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if (u.host.isEmpty) return raw;
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final path = u.path.isEmpty ? '/' : u.path;
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return '${u.scheme}://${u.host}$path';
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}
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/// 排除明显非视频的磁盘文件（HTML 错误页、JSON、过小），避免 ExoPlayer
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/// [UnrecognizedInputFormatException] 反复读坏缓存。
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Future<bool> videoCachedFileLooksPlayable(File f) async {
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try {
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final len = await f.length();
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if (len < 512) return false;
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late List<int> head;
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try {
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head = await f.openRead(0, 16).first;
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} catch (_) {
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return false;
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}
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if (head.length < 12) return false;
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// HTML / XML 错误页
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if (head[0] == 0x3C) {
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final s = String.fromCharCodes(head.take(8));
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if (s.startsWith('<!') || s.startsWith('<?') || s.startsWith('<h')) {
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return false;
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}
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}
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if (head[0] == 0x7B) return false; // JSON
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// MP4/MOV: box size + 'ftyp'
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if (head.length >= 8) {
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final tag = String.fromCharCodes(head.sublist(4, 8));
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if (tag == 'ftyp') return true;
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}
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// WebM EBML
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if (head[0] == 0x1a && head[1] == 0x45 && head[2] == 0xdf) return true;
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// 较大二进制：交给解码器（避免误判少见封装）
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return len >= 4096;
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} catch (_) {
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return false;
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}
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}
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