"type 'int' is not a subtype of type 'Iterable<dynamic>' " when I call enumeratePlaybackDevices() or enumerateRecordingDevices()

[HarukaOki]

Version of the agora_rtc_engine

6.3.2

Platforms affected

• Android
• iOS
• macOS
• Windows
• Web

Steps to reproduce

To be honest, I haven't figured out a reliable way to reproduce this issue. However, occasionally, when I call getAudioDeviceManager().enumeratePlaybackDevices() or getAudioDeviceManager().enumerateRecordingDevices() on MacOS, an error log appears.
I'm a beginner and not very familiar with creating issues like this, so please feel free to let me know if there's any missing information or anything you're concerned about.

Expected results

I hope no such error occurs, or it becomes clearer what I should fix when an error does occur.

Actual results

Occasionally, an error occurs. Please refer to the log below for details.

Code sample

Code sample

...
    late RtcEngine agoraEngine;
    try {
      agoraEngine = createAgoraRtcEngine();
      await agoraEngine.initialize(
        const RtcEngineContext(
          appId: '0cd8cb48f23b418eabdfa90730f956bd',
        ),
      );
    } on Exception catch (e) {
      Log.warn(
        'failed to create RtcEngine',
        e: e,
        fields: {
          'type': 'AgoraEngine',
        },
      );
      rethrow;
    }
    
    if(Platform.isMacOS) {
        final audioInputDeviceInfoList =
        await ragorEngine.getAudioDeviceManager().enumerateRecordingDevices();
    }
...

Screenshots or Video

Screenshots / Video demonstration

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Logs

Logs

This is a typical Firebase Crashlytics log.

Non-fatal Exception: FlutterError
type 'int' is not a subtype of type 'Iterable<dynamic>'
0x0 DeviceInfoListExt.fill + 15 (audio_device_manager_impl.dart:15)
1  ???                            0x0 AudioDeviceManagerImpl.enumerateRecordingDevices + 71 (audio_device_manager_impl.dart:71)
2  ???                            0x0 AgoraEngine.getAvailableInputDevices + 690 (agora.dart:690)
... 

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.24.3, on macOS 14.3 23D56 darwin-arm64, locale ja-JP)
    • Flutter version 3.24.3 on channel stable at /Users/harukaoki/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2663184aa7 (3 weeks ago), 2024-09-11 16:27:48 -0500
    • Engine revision 36335019a8
    • Dart version 3.5.3
    • DevTools version 2.37.3

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/harukaoki/Library/Android/sdk
    • Platform android-35, build-tools 33.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11609105)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15F31d
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11609105)

[✓] VS Code (version 1.94.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.98.0

[✓] Connected device (4 available)
    • iPhone (8) (mobile)             • 00008020-001124CE3CE9002E • ios            • iOS 17.6.1 21G93
    • macOS (desktop)                 • macos                     • darwin-arm64   • macOS 14.3 23D56 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad     • darwin         • macOS 14.3 23D56 darwin-arm64
    • Chrome (web)                    • chrome                    • web-javascript • Google Chrome 129.0.6668.90

[✓] Network resources
    • All expected network resources are available.

• No issues found!