[bug] ANR from CameraCapturer.stopCapture

[furkanKotic]

Describe the bug Here is the ANR I see on some of my users:

main (waiting):tid=1 systid=12632 
       at java.lang.Object.wait(Object.java)
       at java.lang.Object.wait(Object.java:442)
       at java.lang.Object.wait(Object.java:568)
       at org.webrtc.CameraCapturer.stopCapture(CameraCapturer.java:23)
       at org.webrtc.Camera2Capturer.stopCapture(Camera2Capturer.java)
       at com.cloudwebrtc.webrtc.GetUserMediaImpl.removeVideoCapturer(GetUserMediaImpl.java:12)
       at com.cloudwebrtc.webrtc.MethodCallHandlerImpl.trackDispose(MethodCallHandlerImpl.java:39)
       at com.cloudwebrtc.webrtc.MethodCallHandlerImpl.onMethodCall(MethodCallHandlerImpl.java:2114)
       at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:17)
       at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:18)
       at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0(DartMessenger.java:40)
       at io.flutter.embedding.engine.dart.DartMessenger.$r8$lambda$2j2MERcK825A5j1fv5sZ7xB2Iuo(DartMessenger.java)
       at io.flutter.embedding.engine.dart.DartMessenger$$InternalSyntheticLambda$1$5dd8b6f7959f08bc8717eff7469e77e06ef5aed51cc0cee17f1e13794798223f$0.run(DartMessenger.java:12)
       at android.os.Handler.handleCallback(Handler.java:942)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8741)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

To Reproduce My guess is it happens when they try to turn the broadcast off.

Platform information

• Flutter version: Flutter 3.7.5
• Plugin version: livekit_client: ^1.2.1
• Flutter target OS: Android/iOS

[davidzhao]

@cloudwebrtc does this mean we should move this off of the main thread for Android?

[cloudwebrtc]

@cloudwebrtc does this mean we should move this off of the main thread for Android?

yeah, It seems that the release operation is deadlocked in the main thread preemption, it may be caused when switching cameras

[cloudwebrtc]

fixed: https://github.com/flutter-webrtc/flutter-webrtc/commit/370d649f6e821df5987db7631c861ee5d99e04b6

will close when a new version is released