feat: add playback gain methods to all platforms

android/src/main/kotlin/xyz/nuark/liblinphone_flutter/LiblinphoneFlutterPlugin.kt

@@ -227,6 +227,21 @@ class LiblinphoneFlutterPlugin : FlutterPlugin, ActivityAware, MethodCallHandler
                 result.success(linphoneBridge.getMicGain())
             }
 
+            "setPlaybackGain" -> {
+                try {
+                    val level = call.argument<Float>("level")!!
+                    linphoneBridge.setPlaybackGain(level)
+                    result.success(true)
+                } catch (e: Exception) {
+                    Log.e(TAG, "setPlaybackGain: ${e.message}")
+                    result.error("error", e.message, e)
+                }
+            }
+
+            "getPlaybackGain" -> {
+                result.success(linphoneBridge.getPlaybackGain())
+            }
+
             else -> {
                 result.notImplemented()
             }

android/src/main/kotlin/xyz/nuark/liblinphone_flutter/LinphoneBridge.kt

@@ -384,4 +384,12 @@ class LinphoneBridge(
     fun getMicGain(): Float {
         return core.getMicGainDb()
     }
+
+    fun setPlaybackGain(level: Float) {
+        core.setPlaybackGainDb(level)
+    }
+
+    fun getPlaybackGain(): Float {
+        return core.getPlaybackGainDb()
+    }
 }

ios/Classes/LiblinphoneFlutterPlugin.swift

@@ -244,6 +244,23 @@ public class LiblinphoneFlutterPlugin: NSObject, FlutterPlugin {
         case "getMicGain":
             result(linphoneBridge.getMicGain())
 
+        case "setPlaybackGain":
+            guard let args = call.arguments as? [String: Any],
+                  let level = args["level"] as? String else {
+                result(FlutterError(
+                    code: "INVALID_ARGUMENTS",
+                    message: "Missing required arguments",
+                    details: nil
+                ))
+                return
+            }
+            
+            linphoneBridge.setPlaybackGain(level: level)
+            result(success)
+
+        case "getPlaybackGain":
+            result(linphoneBridge.getPlaybackGain())
+
         default:
             result(FlutterMethodNotImplemented)
         }

ios/Classes/LinphoneBridge.swift

@@ -280,6 +280,14 @@ class LinphoneBridge {
     func getMicGain() -> Float {
         return core.micGainDb
     }
+
+    func setPlaybackGain(level: Float) {
+        core.playbackGainDb = level
+    }
+
+    func getPlaybackGain() -> Float {
+        return core.playbackGainDb
+    }
 }
 
 // MARK: - CoreDelegate

lib/liblinphone_flutter.dart

@@ -96,4 +96,10 @@ class LiblinphoneFlutter {
 
   Future<double> getMicGain() async =>
       LiblinphoneFlutterPlatform.instance.getMicGain();
+
+  Future<bool> setPlaybackGain(double level) async =>
+      LiblinphoneFlutterPlatform.instance.setPlaybackGain(level);
+
+  Future<double> getPlaybackGain() async =>
+      LiblinphoneFlutterPlatform.instance.getPlaybackGain();
 }

lib/liblinphone_flutter_method_channel.dart

@@ -130,4 +130,17 @@ class MethodChannelLiblinphoneFlutter extends LiblinphoneFlutterPlatform {
   Future<double> getMicGain() async {
     return (await methodChannel.invokeMethod<double>('getMicGain'))!;
   }
+
+  @override
+  Future<bool> setPlaybackGain(double level) async {
+    return (await methodChannel.invokeMethod<bool>(
+      'setPlaybackGain',
+      <String, dynamic>{'level': level},
+    ))!;
+  }
+
+  @override
+  Future<double> getPlaybackGain() async {
+    return (await methodChannel.invokeMethod<double>('getPlaybackGain'))!;
+  }
 }

lib/liblinphone_flutter_platform_interface.dart

@@ -105,4 +105,12 @@ abstract class LiblinphoneFlutterPlatform extends PlatformInterface {
   Future<double> getMicGain() async {
     throw UnimplementedError('getMicGain() has not been implemented.');
   }
+
+  Future<bool> setPlaybackGain(double level) async {
+    throw UnimplementedError('setPlaybackGain() has not been implemented.');
+  }
+
+  Future<double> getPlaybackGain() async {
+    throw UnimplementedError('getPlaybackGain() has not been implemented.');
+  }
 }