[camera] Added maxVideoDuration to startVideoRecording (flutter#3365)

* Added maxVideoDuration to startVideoRecording

* updated documentation

Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

* updated documentation

Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

* Fixed long line in docs

* Formatting

Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

Author: danielroek

packages/camera/camera_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.1.0
+
+- Added an optional `maxVideoDuration` parameter to the `startVideoRecording` method, which allows implementations to limit the duration of a video recording.
+
 ## 1.0.4
 
 - Added the torch option to the FlashMode enum, which when implemented indicates the flash light should be turned on continuously.

packages/camera/camera_platform_interface/lib/src/method_channel/method_channel_camera.dart

@@ -146,10 +146,14 @@ class MethodChannelCamera extends CameraPlatform {
       _channel.invokeMethod<void>('prepareForVideoRecording');
 
   @override
-  Future<void> startVideoRecording(int cameraId) async {
+  Future<void> startVideoRecording(int cameraId,
+      {Duration maxVideoDuration}) async {
     await _channel.invokeMethod<void>(
       'startVideoRecording',
-      <String, dynamic>{'cameraId': cameraId},
+      <String, dynamic>{
+        'cameraId': cameraId,
+        'maxVideoDuration': maxVideoDuration?.inMilliseconds,
+      },
     );
   }
 

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

@@ -88,8 +88,11 @@ 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.
   /// The video is returned as a [XFile] after calling [stopVideoRecording].
-  Future<void> startVideoRecording(int cameraId) {
+  Future<void> startVideoRecording(int cameraId, {Duration maxVideoDuration}) {
     throw UnimplementedError('startVideoRecording() is not implemented.');
   }
 

packages/camera/camera_platform_interface/pubspec.yaml

@@ -3,7 +3,7 @@ description: A common platform interface for the camera plugin.
 homepage: https://github.com/flutter/plugins/tree/master/packages/camera/camera_platform_interface
 # 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: 1.0.4
+version: 1.1.0
 
 dependencies:
   flutter:

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

@@ -411,10 +411,32 @@ void main() {
         expect(channel.log, <Matcher>[
           isMethodCall('startVideoRecording', arguments: {
             'cameraId': cameraId,
+            'maxVideoDuration': null,
           }),
         ]);
       });
 
+      test('Should pass maxVideoDuration when starting recording a video',
+          () async {
+        // Arrange
+        MethodChannelMock channel = MethodChannelMock(
+          channelName: 'plugins.flutter.io/camera',
+          methods: {'startVideoRecording': null},
+        );
+
+        // Act
+        await camera.startVideoRecording(
+          cameraId,
+          maxVideoDuration: Duration(seconds: 10),
+        );
+
+        // Assert
+        expect(channel.log, <Matcher>[
+          isMethodCall('startVideoRecording',
+              arguments: {'cameraId': cameraId, 'maxVideoDuration': 10000}),
+        ]);
+      });
+
       test('Should stop a video recording and return the file', () async {
         // Arrange
         MethodChannelMock channel = MethodChannelMock(