47 lines
1.7 KiB
Dart
47 lines
1.7 KiB
Dart
import 'package:flutter/services.dart';
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import 'package:mime/mime.dart';
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import '../track_event_manager/device_service.dart';
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import 'file_util.dart';
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class MediaInfo {
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int? size;
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String? resolution;
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int? videoHeight;
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double? ratio;
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int? playTime;
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String? bitrate;
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String? mimeType;
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}
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const _channel = MethodChannel(DeviceInfoService.naticeChannel);
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/// 获取本地视频的元信息（高度/分辨率/比例/时长/比特率/大小/MIME）
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Future<MediaInfo?> getMediaInfo(String localPath) async {
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if (!FileUtil.isFileExist(localPath)) return null;
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final info = MediaInfo();
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info.videoHeight = int.tryParse(await _invokeChannel("getVideoHeight", localPath, "")) ?? 0;
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info.resolution = await _invokeChannel("getVideoResolution", localPath, "");
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info.ratio = double.tryParse(await _invokeChannel("getVideoRatio", localPath, "")) ?? 0;
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info.playTime = await _invokeChannel("getVideoDuration", localPath, 0);
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info.bitrate = await _invokeChannel("getVideoBitrate", localPath, "");
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info.size = FileUtil.getFileSize(localPath);
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info.mimeType = _getMimeType(localPath);
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return info;
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}
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/// 统一调用原生方法，异常或类型不符时返回 fallback
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/// 注：不能只 catch PlatformException——原生 notImplemented / 没实现该 channel(iOS 就没实现这几个)
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/// 抛的是 MissingPluginException，不是 PlatformException，只兜前者等于没兜
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Future<T> _invokeChannel<T>(String method, String localPath, T fallback) async {
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try {
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final result = await _channel.invokeMethod(method, {'filePath': localPath});
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return result is T ? result : fallback;
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} catch (_) {
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return fallback;
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}
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}
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/// 获取 MIME 类型，识别不到返回空串
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String _getMimeType(String localPath) => lookupMimeType(localPath) ?? '';
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