Draft: Feat add clear individual session

apple/src/FFmpegKitConfig.h

@@ -375,6 +375,14 @@ typedef NS_ENUM(NSUInteger, Signal) {
  */
 + (NSArray*)getSessions;
 
+/**
+ * <p>Clears the session specified with <code>sessionId</code> from the session history.
+ * <p>Note that callbacks cannot be triggered for deleted sessions.
+ *
+ * @param sessionId session identifier
+ */
++ (void)clearSession:(long)sessionId;
+
 /**
  * <p>Clears all, including ongoing, sessions in the session history.
  * <p>Note that callbacks cannot be triggered for deleted sessions.

apple/src/FFmpegKitConfig.m

@@ -1237,6 +1237,17 @@ + (NSArray*)getSessions {
     return sessionsCopy;
 }
 
++ (void)clearSession:(long)sessionId {
+    [sessionHistoryLock lock];
+    id<Session> session = [self getSession:sessionId];
+    if (session != nil) {
+        [sessionHistoryList removeObject:session];
+        [sessionHistoryMap removeObjectForKey:[NSNumber numberWithLong:sessionId]];
+    }
+
+    [sessionHistoryLock unlock];
+}
+
 + (void)clearSessions {
     [sessionHistoryLock lock];
 

flutter/flutter/ios/Classes/FFmpegKitFlutterPlugin.m

@@ -395,6 +395,12 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
     [self getSessions:result];
   } else if ([@"clearSessions" isEqualToString:call.method]) {
     [self clearSessions:result];
+  } else if ([@"clearSession" isEqualToString:call.method]) {
+    if (sessionId != nil) {
+      [self clearSession:sessionId result:result];
+    } else {
+      result([FlutterError errorWithCode:@"INVALID_SESSION" message:@"Invalid session id." details:nil]);
+    }
   } else if ([@"getSessionsByState" isEqualToString:call.method]) {
     NSNumber* stateIndex = call.arguments[@"state"];
     if (stateIndex != nil) {
@@ -909,6 +915,11 @@ - (void)getSessions:(FlutterResult)result {
   result([FFmpegKitFlutterPlugin toSessionArray:[FFmpegKitConfig getSessions]]);
 }
 
+- (void)clearSession:(NSNumber*)sessionId result:(FlutterResult)result {
+  [FFmpegKitConfig clearSession:[sessionId longValue]];
+  result(nil);
+}
+
 - (void)clearSessions:(FlutterResult)result {
   [FFmpegKitConfig clearSessions];
   result(nil);

flutter/flutter/lib/ffmpeg_kit_config.dart

@@ -496,6 +496,18 @@ class FFmpegKitConfig {
     }
   }
 
+  /// Deletes a session from the session history.
+  /// Note that callbacks cannot be triggered for deleted sessions.
+  static Future<void> clearSession(int sessionId) async {
+    try {
+      await init();
+      return _platform.clearSession(sessionId);
+    } on PlatformException catch (e, stack) {
+      print("Plugin clearSession error: ${e.message}");
+      return Future.error("clearSession failed.", stack);
+    }
+  }
+
   /// Clears all, including ongoing, sessions in the session history.
   /// Note that callbacks cannot be triggered for deleted sessions.
   static Future<void> clearSessions() async {

flutter/flutter_platform_interface/lib/ffmpeg_kit_flutter_platform_interface.dart

@@ -272,6 +272,10 @@ abstract class FFmpegKitPlatform extends PlatformInterface {
         'ffmpegKitConfigGetSessions() has not been implemented!');
   }
 
+  Future<void> clearSession(int sessionId) async {
+    throw UnimplementedError('clearSession() has not been implemented!');
+  }
+
   Future<void> clearSessions() async {
     throw UnimplementedError('clearSessions() has not been implemented!');
   }

flutter/flutter_platform_interface/lib/method_channel_ffmpeg_kit_flutter.dart

@@ -243,6 +243,10 @@ class MethodChannelFFmpegKit extends FFmpegKitPlatform {
   Future<List<dynamic>?> ffmpegKitConfigGetSessions() async =>
       _channel.invokeMethod<List<dynamic>>('getSessions');
 
+  @override
+  Future<void> clearSession(int sessionId) async =>
+      _channel.invokeMethod<void>('clearSession', {'sessionId': sessionId});
+
   @override
   Future<void> clearSessions() async =>
       _channel.invokeMethod<void>('clearSessions');