优化录制页性能

plugins/apivideo_live_stream/lib/src/apivideo_camera_preview.dart

@@ -68,7 +68,6 @@ class _ApiVideoCameraPreviewState extends State<ApiVideoCameraPreview> {
 
   @override
   void dispose() {
-    widget.controller.stopPreview();
     widget.controller.removeWidgetListener(_widgetListener);
     widget.controller.removeEventsListener(_eventsListener);
     super.dispose();

plugins/apivideo_live_stream/lib/src/apivideo_live_stream_controller.dart

@@ -26,6 +26,8 @@ class ApiVideoLiveStreamController {
   int get textureId => _textureId;
 
   bool _isInitialized = false;
+  Future<void>? _initializeFuture;
+  Future<void>? _disposeFuture;
 
   /// Gets the current state of the video player.
   bool get isInitialized => _isInitialized;
@@ -68,7 +70,14 @@ class ApiVideoLiveStreamController {
   }
 
   /// Creates a new live stream instance with initial audio and video configurations.
-  Future<void> initialize() async {
+  Future<void> initialize() {
+    if (_disposeFuture != null) {
+      throw StateError('Cannot initialize a disposed controller');
+    }
+    return _initializeFuture ??= _initialize();
+  }
+
+  Future<void> _initialize() async {
     _textureId = await _platform.initialize() ?? kUninitializedTextureId;
 
     _eventSubscription = _platform
@@ -91,12 +100,23 @@ class ApiVideoLiveStreamController {
   }
 
   /// Disposes the live stream instance.
-  Future<void> dispose() async {
+  Future<void> dispose() {
+    return _disposeFuture ??= _dispose();
+  }
+
+  Future<void> _dispose() async {
+    try {
+      await _initializeFuture;
+    } catch (_) {
+      // A partially initialized native view still needs to be disposed.
+    }
     await _eventSubscription?.cancel();
+    _eventSubscription = null;
     _eventsListeners.clear();
     _widgetListeners.clear();
     await _platform.dispose();
-    return;
+    _isInitialized = false;
+    _textureId = kUninitializedTextureId;
   }
 
   /// Sets new video parameters.