custom video aspectRatio

Closes #1040

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/plugin/pl_player/models/video_fit_type.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart' show BoxFit;
+
+enum VideoFitType {
+  fill('拉伸', boxFit: BoxFit.fill),
+  contain('自动', boxFit: BoxFit.contain),
+  cover('裁剪', boxFit: BoxFit.cover),
+  fitWidth('等宽', boxFit: BoxFit.fitWidth),
+  fitHeight('等高', boxFit: BoxFit.fitHeight),
+  none('原始', boxFit: BoxFit.none),
+  scaleDown('限制', boxFit: BoxFit.scaleDown),
+  ratio_4x3('4:3', aspectRatio: 4 / 3),
+  ratio_16x9('16:9', aspectRatio: 16 / 9);
+
+  final String desc;
+  final BoxFit boxFit;
+  final double? aspectRatio;
+  const VideoFitType(
+    this.desc, {
+    this.boxFit = BoxFit.contain,
+    this.aspectRatio,
+  });
+}