feat: add step forward and step backward

lib/hooks/use_fvp_player.dart

@@ -257,6 +257,16 @@ FvpPlayer useFvpPlayer(BuildContext context) {
             : await controller.seekTo(newPosition);
   }
 
+  Future<void> stepBackward() async {
+    await controller.step(frames: -1);
+    logger('Step backward');
+  }
+
+  Future<void> stepForward() async {
+    await controller.step(frames: 1);
+    logger('Step forward');
+  }
+
   Future<void> saveProgress() async {
     if (file != null && duration != Duration.zero) {
       if (Platform.isAndroid && file.uri.startsWith('content://')) {
@@ -296,6 +306,8 @@ FvpPlayer useFvpPlayer(BuildContext context) {
         seekTo(Duration(seconds: position.inSeconds - seconds)),
     forward: (seconds) =>
         seekTo(Duration(seconds: position.inSeconds + seconds)),
+    stepBackward: stepBackward,
+    stepForward: stepForward,
     updateRate: (value) => controller.setPlaybackSpeed(value),
     seekTo: seekTo,
     saveProgress: saveProgress,

lib/hooks/use_media_kit_player.dart

@@ -293,6 +293,22 @@ MediaKitPlayer useMediaKitPlayer(BuildContext context) {
     await seekTo(Duration(seconds: position.value.inSeconds + seconds));
   }
 
+  Future<void> stepBackward() async {
+    final nativePlayer = player.platform;
+    if (nativePlayer is NativePlayer) {
+      await nativePlayer.command(['frame-back-step']);
+      logger('Step backward');
+    }
+  }
+
+  Future<void> stepForward() async {
+    final nativePlayer = player.platform;
+    if (nativePlayer is NativePlayer) {
+      await nativePlayer.command(['frame-step']);
+      logger('Step forward');
+    }
+  }
+
   Future<void> updateRate(double value) async =>
       player.state.rate == value ? null : await player.setRate(value);
 
@@ -321,6 +337,8 @@ MediaKitPlayer useMediaKitPlayer(BuildContext context) {
     pause: pause,
     backward: backward,
     forward: forward,
+    stepBackward: stepBackward,
+    stepForward: stepForward,
     updateRate: updateRate,
     seekTo: seekTo,
   );

lib/models/player.dart

@@ -23,6 +23,8 @@ class MediaPlayer {
   final Future<void> Function() pause;
   final Future<void> Function(int) backward;
   final Future<void> Function(int) forward;
+  final Future<void> Function() stepBackward;
+  final Future<void> Function() stepForward;
   final Future<void> Function(double) updateRate;
   final Future<void> Function(Duration) seekTo;
 
@@ -45,6 +47,8 @@ class MediaPlayer {
     required this.pause,
     required this.backward,
     required this.forward,
+    required this.stepBackward,
+    required this.stepForward,
     required this.updateRate,
     required this.seekTo,
   });
@@ -83,6 +87,8 @@ class MediaKitPlayer extends MediaPlayer {
     required super.pause,
     required super.backward,
     required super.forward,
+    required super.stepBackward,
+    required super.stepForward,
     required super.updateRate,
     required super.seekTo,
   });
@@ -113,6 +119,8 @@ class FvpPlayer extends MediaPlayer {
     required super.pause,
     required super.backward,
     required super.forward,
+    required super.stepBackward,
+    required super.stepForward,
     required super.updateRate,
     required super.seekTo,
   });

lib/pages/player/iris_player.dart

@@ -406,6 +406,12 @@ class IrisPlayer extends HookWidget {
             showControl();
             await useUiStore().toggleIsAlwaysOnTop();
             break;
+          case LogicalKeyboardKey.equal:
+            await player.stepForward();
+            break;
+          case LogicalKeyboardKey.minus:
+            await player.stepBackward();
+            break;
           default:
             break;
         }