[camera_platform_interface] Add NV21 as an image stream format

packages/camera/camera_platform_interface/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 2.5.0
 
+* Adds NV21 as an image stream format (suitable for Android).
 * Aligns Dart and Flutter SDK constraints.
 
 ## 2.4.1

packages/camera/camera_platform_interface/lib/src/types/image_format_group.dart

@@ -31,6 +31,12 @@ enum ImageFormatGroup {
   /// On Android, this is `android.graphics.ImageFormat.JPEG`. See
   /// https://developer.android.com/reference/android/graphics/ImageFormat#JPEG
   jpeg,
+
+  /// YCrCb format used for images, which uses the NV21 encoding format.
+  ///
+  /// On Android, this is `android.graphics.ImageFormat.NV21`. See
+  /// https://developer.android.com/reference/android/graphics/ImageFormat#NV21
+  nv21,
 }
 
 /// Extension on [ImageFormatGroup] to stringify the enum
@@ -46,6 +52,8 @@ extension ImageFormatGroupName on ImageFormatGroup {
         return 'yuv420';
       case ImageFormatGroup.jpeg:
         return 'jpeg';
+      case ImageFormatGroup.nv21:
+        return 'nv21';
       case ImageFormatGroup.unknown:
         return 'unknown';
     }

packages/camera/camera_platform_interface/pubspec.yaml

@@ -4,7 +4,7 @@ repository: https://github.com/flutter/packages/tree/main/packages/camera/camera
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 2.4.1
+version: 2.5.0
 
 environment:
   sdk: ">=2.17.0 <4.0.0"

packages/camera/camera_platform_interface/test/types/image_group_test.dart

@@ -11,6 +11,7 @@ void main() {
       expect(ImageFormatGroup.bgra8888.name(), 'bgra8888');
       expect(ImageFormatGroup.yuv420.name(), 'yuv420');
       expect(ImageFormatGroup.jpeg.name(), 'jpeg');
+      expect(ImageFormatGroup.nv21.name(), 'nv21');
       expect(ImageFormatGroup.unknown.name(), 'unknown');
     });
   });