Customization of iOS audio categories from flutter

record/example/ios/Runner/AppDelegate.swift

@@ -1,7 +1,7 @@
 import UIKit
 import Flutter
 
-@UIApplicationMain
+@main
 @objc class AppDelegate: FlutterAppDelegate {
   override func application(
     _ application: UIApplication,

record_darwin/darwin/Classes/RecordConfig.swift

@@ -1,3 +1,5 @@
+import AVFoundation
+
 public enum AudioEncoder: String {
   case aacLc = "aacLc"
   case aacEld = "aacEld"
@@ -19,6 +21,7 @@ public class RecordConfig {
   let autoGain: Bool
   let echoCancel: Bool
   let noiseSuppress: Bool
+  let iosConfig: IosConfig?
 
   init(encoder: String,
        bitRate: Int,
@@ -27,7 +30,8 @@ public class RecordConfig {
        device: Device? = nil,
        autoGain: Bool = false,
        echoCancel: Bool = false,
-       noiseSuppress: Bool = false
+       noiseSuppress: Bool = false,
+       iosConfig: IosConfig? = nil
   ) {
     self.encoder = encoder
     self.bitRate = bitRate
@@ -37,27 +41,58 @@ public class RecordConfig {
     self.autoGain = autoGain
     self.echoCancel = echoCancel
     self.noiseSuppress = noiseSuppress
+    self.iosConfig = iosConfig
   }
 }
 
 public class Device {
   let id: String
   let label: String
-  
+
   init(id: String, label: String) {
     self.id = id
     self.label = label
   }
-  
+
   init(map: [String: Any]) {
     self.id = map["id"] as! String
     self.label = map["label"] as! String
   }
-  
+
   func toMap() -> [String: Any] {
     return [
       "id": id,
       "label": label
     ]
   }
 }
+
+struct IosConfig {
+  let audioCategories: [AVAudioSession.CategoryOptions]
+
+  init(map: [String: Any]) {
+    let comps = map["audioCategories"] as? String
+    let options: [AVAudioSession.CategoryOptions]? = comps?.split(separator: ",").compactMap {
+      switch $0 {
+      case "mixWithOthers":
+          .mixWithOthers
+      case "duckOthers":
+          .duckOthers
+      case "allowBluetooth":
+          .allowBluetooth
+      case "defaultToSpeaker":
+          .defaultToSpeaker
+      case "interruptSpokenAudioAndMixWithOthers":
+          .interruptSpokenAudioAndMixWithOthers
+      case "allowBluetoothA2DP":
+          .allowBluetoothA2DP
+      case "allowAirPlay":
+          .allowAirPlay
+      case "overrideMutedMicrophoneInterruption":
+        if #available(iOS 14.5, *) { .overrideMutedMicrophoneInterruption } else { nil }
+      default: nil
+      }
+    }
+    self.audioCategories = options ?? []
+  }
+}

record_darwin/darwin/Classes/SwiftRecordPlugin.swift

@@ -184,7 +184,12 @@ public class SwiftRecordPlugin: NSObject, FlutterPlugin {
     if let deviceMap = args["device"] as? [String : Any] {
       device = Device(map: deviceMap)
     }
-
+
+    var iosConfig: IosConfig? = nil
+    if let iosConfigMap = args["iosConfig"] as? [String : Any] {
+      iosConfig = IosConfig(map: iosConfigMap)
+    }
+
     let config = RecordConfig(
       encoder: encoder,
       bitRate: args["bitRate"] as? Int ?? 128000,
@@ -193,7 +198,8 @@ public class SwiftRecordPlugin: NSObject, FlutterPlugin {
       device: device,
       autoGain: args["autoGain"] as? Bool ?? false,
       echoCancel: args["echoCancel"] as? Bool ?? false,
-      noiseSuppress: args["noiseSuppress"] as? Bool ?? false
+      noiseSuppress: args["noiseSuppress"] as? Bool ?? false,
+      iosConfig: iosConfig
     )
 
     return config

record_darwin/ios/Classes/RecorderIOS.swift

@@ -13,7 +13,7 @@ func listInputs() throws -> [Device] {
 func listInputDevices() throws -> [AVAudioSessionPortDescription]? {
   let audioSession = AVAudioSession.sharedInstance()
   let options: AVAudioSession.CategoryOptions = [.defaultToSpeaker, .allowBluetooth]
-  
+
   do {
     try audioSession.setCategory(.playAndRecord, options: options)
   } catch {
@@ -46,10 +46,9 @@ private func setInput(_ config: RecordConfig) throws {
 extension AudioRecordingDelegate {
   func initAVAudioSession(config: RecordConfig) throws {
     let audioSession = AVAudioSession.sharedInstance()
-    let options: AVAudioSession.CategoryOptions = [.defaultToSpeaker, .allowBluetooth, .allowBluetoothA2DP]
-
+
     do {
-      try audioSession.setCategory(.playAndRecord, options: options)
+        try audioSession.setCategory(.playAndRecord, options: AVAudioSession.CategoryOptions(config.iosConfig?.audioCategories ?? []))
     } catch {
       throw RecorderError.error(message: "Failed to start recording", details: "setCategory: \(error.localizedDescription)")
     }

record_platform_interface/lib/src/types/ios_audio_categories.dart

@@ -0,0 +1,16 @@
+/// Constants that specify optional audio behaviors.
+/// https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions
+enum IosAudioCategories {
+  mixWithOthers,
+  duckOthers,
+  allowBluetooth,
+  defaultToSpeaker,
+  /// available from iOS 9.0
+  interruptSpokenAudioAndMixWithOthers,
+  /// available from iOS 10.0
+  allowBluetoothA2DP,
+  /// available from iOS 10.0
+  allowAirPlay,
+  /// available from iOS 14.5
+  overrideMutedMicrophoneInterruption
+}

record_platform_interface/lib/src/types/record_config.dart

@@ -51,6 +51,9 @@ class RecordConfig {
   /// Android specific configuration.
   final AndroidRecordConfig androidConfig;
 
+  /// iOS specific audioCategories
+  final IosRecordConfig iosConfig;
+
   const RecordConfig({
     this.encoder = AudioEncoder.aacLc,
     this.bitRate = 128000,
@@ -61,6 +64,7 @@ class RecordConfig {
     this.echoCancel = false,
     this.noiseSuppress = false,
     this.androidConfig = const AndroidRecordConfig(),
+    this.iosConfig = const IosRecordConfig(), 
   });
 
   Map<String, dynamic> toMap() {
@@ -74,6 +78,7 @@ class RecordConfig {
       'echoCancel': echoCancel,
       'noiseSuppress': noiseSuppress,
       'androidConfig': androidConfig.toMap(),
+      'iosConfig': iosConfig.toMap(),
     };
   }
 }
@@ -108,3 +113,21 @@ class AndroidRecordConfig {
     };
   }
 }
+
+///
+class IosRecordConfig {
+
+  /// Constants that specify optional audio behaviors.
+  /// https://developer.apple.com/documentation/avfaudio/avaudiosession/categoryoptions
+  final List<IosAudioCategories> audioCategories;
+
+  const IosRecordConfig({
+    this.audioCategories = const [IosAudioCategories.defaultToSpeaker, IosAudioCategories.allowBluetooth, IosAudioCategories.allowBluetoothA2DP]
+  });
+  Map<String, dynamic> toMap() {
+    return {
+      "audioCategories": audioCategories.map((e) => e.name).join(',')
+    };
+  }
+
+}

record_platform_interface/lib/src/types/types.dart

@@ -3,3 +3,4 @@ export 'package:record_platform_interface/src/types/audio_encoder.dart';
 export 'package:record_platform_interface/src/types/input_device.dart';
 export 'package:record_platform_interface/src/types/record_config.dart';
 export 'package:record_platform_interface/src/types/record_state.dart';
+export 'package:record_platform_interface/src/types/ios_audio_categories.dart';