[camera] Deprecate maxDuration in platform interface (#7078)

Platform interface portion of #7039

Part of flutter/flutter#150959

Author: stuartmorgan-g

packages/camera/camera_platform_interface/CHANGELOG.md

@@ -1,5 +1,7 @@
-## NEXT
+## 2.8.0
 
+* Deprecates `maxVideoDuration`/`maxDuration`, as it was never implemented on
+  most platforms, and there is no plan to implement it in the future.
 * Updates minimum supported SDK version to Flutter 3.16/Dart 3.2.
 
 ## 2.7.4

packages/camera/camera_platform_interface/lib/src/platform_interface/camera_platform.dart

@@ -140,14 +140,13 @@ abstract class CameraPlatform extends PlatformInterface {
 
   /// Starts a video recording.
   ///
-  /// The length of the recording can be limited by specifying the [maxVideoDuration].
-  /// By default no maximum duration is specified,
-  /// meaning the recording will continue until manually stopped.
-  /// With [maxVideoDuration] set the video is returned in a [VideoRecordedEvent]
-  /// through the [onVideoRecordedEvent] stream when the set duration is reached.
-  ///
   /// This method is deprecated in favour of [startVideoCapturing].
-  Future<void> startVideoRecording(int cameraId, {Duration? maxVideoDuration}) {
+  Future<void> startVideoRecording(
+    int cameraId, {
+    @Deprecated(
+        'This parameter is unused, and will be ignored on all platforms')
+    Duration? maxVideoDuration,
+  }) {
     throw UnimplementedError('startVideoRecording() is not implemented.');
   }
 
@@ -156,8 +155,7 @@ abstract class CameraPlatform extends PlatformInterface {
   /// Please see [VideoCaptureOptions] for documentation on the
   /// configuration options.
   Future<void> startVideoCapturing(VideoCaptureOptions options) {
-    return startVideoRecording(options.cameraId,
-        maxVideoDuration: options.maxDuration);
+    return startVideoRecording(options.cameraId);
   }
 
   /// Stops the video recording and returns the file where it was saved.

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

@@ -12,6 +12,8 @@ class VideoCaptureOptions {
   /// Constructs a new instance.
   const VideoCaptureOptions(
     this.cameraId, {
+    @Deprecated(
+        'This parameter is unused, and will be ignored on all platforms')
     this.maxDuration,
     this.streamCallback,
     this.streamOptions,
@@ -24,8 +26,9 @@ class VideoCaptureOptions {
   final int cameraId;
 
   /// The maximum time to perform capturing for.
-  ///
-  /// By default there is no maximum on the capture time.
+  @Deprecated('This parameter is unused, and will be ignored on all platforms')
+  // Platform implementations should not implement this, as it will never be
+  // passed from the app-facing layer.
   final Duration? maxDuration;
 
   /// An optional callback to enable streaming.

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: 2.7.4
+version: 2.8.0
 
 environment:
   sdk: ^3.2.0

packages/camera/camera_platform_interface/test/method_channel/method_channel_camera_test.dart

@@ -643,30 +643,6 @@ void main() {
         ]);
       });
 
-      test('Should pass maxVideoDuration when starting recording a video',
-          () async {
-        // Arrange
-        final MethodChannelMock channel = MethodChannelMock(
-          channelName: 'plugins.flutter.io/camera',
-          methods: <String, dynamic>{'startVideoRecording': null},
-        );
-
-        // Act
-        await camera.startVideoRecording(
-          cameraId,
-          maxVideoDuration: const Duration(seconds: 10),
-        );
-
-        // Assert
-        expect(channel.log, <Matcher>[
-          isMethodCall('startVideoRecording', arguments: <String, Object?>{
-            'cameraId': cameraId,
-            'maxVideoDuration': 10000,
-            'enableStream': false,
-          }),
-        ]);
-      });
-
       test('Should stop a video recording and return the file', () async {
         // Arrange
         final MethodChannelMock channel = MethodChannelMock(