Better audio management (#10)

* add audio_session package

* `AudioManager` initial design

* try to integrate audio manager

* configure audio session

* `DisposeAware`

disposing if already published causes exception.

* organize

* guard flutter_webrtc calls

* websocket async fix

* use `ConnectionState` instead of `_isClosed` and `isReconnecting`

* change create audio track defaults

* update protos

* protocol 3 speaker updates

* fix exception

* emit `RoomDisconnectedEvent` only once

* fix exception

* keep track of local / remote audio tracks

* explicit types

* manage track state

* re-structure audio management

* change defaults

* unpublish all

* use experimental build

* change defaults

* configuring is optional

* call native `RTCAudioSession.setConfiguration`

* defaults adjustment

* iOS only for now

* use lib 92.4515.07

* clean up

* revert audio options for now

* remove pod source

* rename apple related audio

* `createListener` method

* organize native audio

* `SpeakingChangedEvent` only on `Participant`

* refactoring

* fix ios compile

* fix configure audio only for iOS logic

* minor fix & clean up

* change dispose logic

* format protos

* fix unpublishTrack

* `createListener` into a mixin

* simplify

* use flutter_webrtc master

* unpublish for example

* update ios icon

* android icon

* web icon

* favicon

example/lib/exts.dart

@@ -20,6 +20,24 @@ extension LKExampleExt on BuildContext {
         ),
       );
 
+  Future<bool?> showUnPublishDialog() => showDialog<bool>(
+        context: this,
+        builder: (ctx) => AlertDialog(
+          title: const Text('UnPublish'),
+          content: const Text('Would you like to un-publish your Camera & Mic ?'),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(ctx, false),
+              child: const Text('NO'),
+            ),
+            TextButton(
+              onPressed: () => Navigator.pop(ctx, true),
+              child: const Text('YES'),
+            ),
+          ],
+        ),
+      );
+
   Future<void> showErrorDialog(dynamic exception) => showDialog<void>(
         context: this,
         builder: (ctx) => AlertDialog(

example/lib/main.dart

@@ -1,16 +1,14 @@
 import 'package:flutter/material.dart';
-import 'package:livekit_client/livekit_client.dart';
 import 'package:livekit_example/theme.dart';
 import 'package:logging/logging.dart';
 
 import 'pages/connect.dart';
 
 void main() {
-  print('This is a test for ${SignalTrickleEvent} test.');
   // configure logs for debugging
   Logger.root.level = Level.FINE;
   Logger.root.onRecord.listen((record) {
-    print('${record.level.name}: ${record.time}: ${record.message}');
+    print('${record.level.name}: ${record.message}');
   });
 
   WidgetsFlutterBinding.ensureInitialized();

example/lib/pages/room.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'dart:math' as math;
 
+import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:livekit_client/livekit_client.dart';
@@ -25,7 +26,7 @@ class RoomPage extends StatefulWidget {
 class _RoomPageState extends State<RoomPage> {
   //
   List<Participant> participants = [];
-  late final _listener = EventsListener<RoomEvent>(widget.room.events);
+  late final EventsListener<RoomEvent> _listener = widget.room.createListener();
 
   @override
   void initState() {
@@ -48,7 +49,9 @@ class _RoomPageState extends State<RoomPage> {
   }
 
   void _setUpListeners() => _listener
-    ..on<RoomDisconnectedEvent>((_) => Navigator.pop(context))
+    ..on<RoomDisconnectedEvent>((_) async {
+      WidgetsBinding.instance?.addPostFrameCallback((timeStamp) => Navigator.pop(context));
+    })
     ..on<DataReceivedEvent>((event) {
       String decoded = 'Failed to decode';
       try {

example/lib/widgets/controls.dart

@@ -1,9 +1,10 @@
 import 'dart:convert';
 
+import 'package:collection/collection.dart';
 import 'package:eva_icons_flutter/eva_icons_flutter.dart';
 import 'package:flutter/material.dart';
 import 'package:livekit_client/livekit_client.dart';
-import 'package:collection/collection.dart';
+
 import '../exts.dart';
 
 class ControlsWidget extends StatefulWidget {
@@ -44,6 +45,15 @@ class _ControlsWidgetState extends State<ControlsWidget> {
     setState(() {});
   }
 
+  void _unpublishAll() async {
+    final result = await context.showUnPublishDialog();
+    if (result == true) {
+      await participant.unpublishAllTracks();
+      // Force to update UI for now
+      participant.notifyListeners();
+    }
+  }
+
   void _muteAudio() {
     if (participant.hasAudio) {
       final audioPub = participant.audioTracks.first;
@@ -146,6 +156,10 @@ class _ControlsWidgetState extends State<ControlsWidget> {
     return Row(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
+        IconButton(
+          onPressed: _unpublishAll,
+          icon: const Icon(EvaIcons.closeCircleOutline),
+        ),
         if (canMute)
           IconButton(
             onPressed: _muteAudio,