feat: 增加分辨率修改

webrtc_controller_flutter/lib/main.dart

@@ -47,6 +47,16 @@ class _ControllerHomeState extends State<ControllerHome> {
   String _stats = '';
   double _videoAspect = 16 / 9;
 
+  /// 分辨率预设：width 为长边像素；0 表示被控端原生分辨率；
+  /// height 传 0（由被控端按屏幕宽高比计算），fps 传 0（沿用当前帧率）。
+  int _selectedResolution = 0;
+  final List<Map<String, Object>> _resolutionOptions = const [
+    {'label': '原始', 'width': 0, 'height': 0, 'fps': 0},
+    {'label': '1080P', 'width': 1920, 'height': 0, 'fps': 0},
+    {'label': '720P', 'width': 1280, 'height': 0, 'fps': 0},
+    {'label': '480P', 'width': 854, 'height': 0, 'fps': 0},
+  ];
+
   @override
   void initState() {
     super.initState();
@@ -320,6 +330,29 @@ class _ControllerHomeState extends State<ControllerHome> {
             ),
           ),
         ),
+        Positioned(
+          bottom: 16,
+          left: 16,
+          child: CupertinoSegmentedControl<int>(
+            groupValue: _selectedResolution,
+            children: <int, Widget>{
+              for (int i = 0; i < _resolutionOptions.length; i++)
+                i: Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
+                  child: Text(_resolutionOptions[i]['label'] as String),
+                ),
+            },
+            onValueChanged: (int idx) {
+              setState(() => _selectedResolution = idx);
+              final o = _resolutionOptions[idx];
+              _controller?.sendResolutionChange(
+                o['width'] as int,
+                o['height'] as int,
+                o['fps'] as int,
+              );
+            },
+          ),
+        ),
       ],
       ),
     );