Subscriber as primary (#8)

* Update protos

* Signal client

* Improve transport

* First implementation

* Fix publish

* Update `PCTransport` for debounce negotiation

* debounce func

* reconnect & events

* Update debounce func

* engine events

* make sure events don't emit after dispose

* prefix flutter_webrtc

* Cleaner `iceServers` update

* don't mutate user provided params

* fix tests

* event manager

* Fix: `Room.onDisconnected` gets fired multiple times

* data publish in example

* cleaner logic

* safer events

* un-prefix with LK

* organize imports

* Clean up

* remove `Tuple`

* `EventsEmitter` can now be directly listened to

`EventsEmitter` extends `EventsListenable`

lib/src/participant/local_participant.dart

@@ -1,7 +1,8 @@
 import 'package:flutter/foundation.dart';
-import 'package:flutter_webrtc/flutter_webrtc.dart';
+import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 
 import '../errors.dart';
+import '../extensions.dart';
 import '../logger.dart';
 import '../options.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
@@ -11,6 +12,7 @@ import '../track/local_track_publication.dart';
 import '../track/local_video_track.dart';
 import '../track/track.dart';
 import '../track/track_publication.dart';
+import '../types.dart';
 import '../utils.dart';
 import 'participant.dart';
 
@@ -35,7 +37,7 @@ class LocalParticipant extends Participant {
   /// publish an audio track to the room
   Future<TrackPublication> publishAudioTrack(LocalAudioTrack track) async {
     if (audioTracks.any((e) => e.track?.mediaStreamTrack.id == track.mediaStreamTrack.id)) {
-      throw TrackPublishError('track already exists');
+      throw TrackPublishException('track already exists');
     }
 
     // try {
@@ -45,14 +47,16 @@ class LocalParticipant extends Participant {
       kind: track.kind,
     );
 
-    final transceiverInit = RTCRtpTransceiverInit(
-      direction: TransceiverDirection.SendOnly,
+    final transceiverInit = rtc.RTCRtpTransceiverInit(
+      direction: rtc.TransceiverDirection.SendOnly,
     );
     // addTransceiver cannot pass in a kind parameter due to a bug in flutter-webrtc (web)
     track.transceiver = await _engine.publisher?.pc.addTransceiver(
       track: track.mediaStreamTrack,
+      kind: rtc.RTCRtpMediaType.RTCRtpMediaTypeAudio,
       init: transceiverInit,
     );
+    await _engine.negotiate();
 
     final pub = LocalTrackPublication(trackInfo, track, this);
     addTrackPublication(pub);
@@ -67,7 +71,7 @@ class LocalParticipant extends Participant {
     TrackPublishOptions? options,
   }) async {
     if (videoTracks.any((e) => e.track?.mediaStreamTrack.id == track.mediaStreamTrack.id)) {
-      throw TrackPublishError('track already exists');
+      throw TrackPublishException('track already exists');
     }
 
     // Use default options from `ConnectOptions` if options is null
@@ -78,10 +82,9 @@ class LocalParticipant extends Participant {
       name: track.name,
       kind: track.kind,
     );
+    logger.fine('publishVideoTrack addTrack response: ${trackInfo}');
 
-    //
     // Video encodings and simulcasts
-    //
 
     // use constraints passed to getUserMedia by default
     int? width = track.currentOptions.params.width;
@@ -94,8 +97,6 @@ class LocalParticipant extends Participant {
         final settings = track.mediaStreamTrack.getSettings();
         width = settings['width'] as int?;
         height = settings['height'] as int?;
-        // TODO: Get actual video dimensions to compute more accurately
-        // mediaTrack.getConsstraints() is not implemented for mobile
       } catch (_) {
         logger.warning('Failed to call `mediaStreamTrack.getSettings()`');
       }
@@ -111,19 +112,20 @@ class LocalParticipant extends Participant {
 
     logger.fine('Using encodings: ${encodings?.map((e) => e.toMap())}');
 
-    final transceiverInit = RTCRtpTransceiverInit(
-      direction: TransceiverDirection.SendOnly,
+    final transceiverInit = rtc.RTCRtpTransceiverInit(
+      direction: rtc.TransceiverDirection.SendOnly,
       sendEncodings: encodings,
       streams: [track.mediaStream],
     );
 
-    //
-    // addTransceiver cannot pass in a kind parameter due to a bug in flutter-webrtc (web)
-    //
+    logger.fine('publishVideoTrack publisher: ${_engine.publisher}');
+
     track.transceiver = await _engine.publisher?.pc.addTransceiver(
       track: track.mediaStreamTrack,
+      kind: rtc.RTCRtpMediaType.RTCRtpMediaTypeVideo,
       init: transceiverInit,
     );
+    await _engine.negotiate();
 
     final pub = LocalTrackPublication(trackInfo, track, this);
     addTrackPublication(pub);
@@ -144,6 +146,7 @@ class LocalParticipant extends Participant {
     final sender = track.transceiver?.sender;
     if (sender != null) {
       await engine.publisher?.pc.removeTrack(sender);
+      await engine.negotiate();
     }
 
     tracks.remove(pub.sid);
@@ -151,26 +154,13 @@ class LocalParticipant extends Participant {
 
   /// Publish a new data payload to the room.
   /// @param destinationSids When empty, data will be forwarded to each participant in the room.
-  void publishData(
-    List<int> data,
-    lk_models.DataPacket_Kind reliability, {
+  Future<void> publishData(
+    List<int> data, {
+    Reliability reliability = Reliability.reliable,
     List<String>? destinationSids,
-  }) {
-    RTCDataChannel? channel;
-    switch (reliability) {
-      case lk_models.DataPacket_Kind.RELIABLE:
-        channel = engine.reliableDC;
-        break;
-      case lk_models.DataPacket_Kind.LOSSY:
-        channel = engine.lossyDC;
-        break;
-    }
-    if (channel == null) {
-      return;
-    }
-
+  }) async {
     final packet = lk_models.DataPacket(
-      kind: reliability,
+      kind: reliability.toPBType(),
       user: lk_models.UserPacket(
         payload: data,
         participantSid: sid,
@@ -178,8 +168,7 @@ class LocalParticipant extends Participant {
       ),
     );
 
-    final buffer = packet.writeToBuffer();
-    channel.send(RTCDataChannelMessage.fromBinary(buffer));
+    await engine.sendDataPacket(packet);
   }
 
   /// for internal use

lib/src/participant/participant.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/foundation.dart';
 
+import '../events.dart';
+import '../managers/event.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
 import '../track/remote_track_publication.dart';
 import '../track/track.dart';
@@ -77,6 +79,9 @@ class Participant extends ChangeNotifier {
   lk_models.ParticipantInfo? _participantInfo;
   bool _isSpeaking = false;
 
+  // suppport for multiple event listeners
+  final events = EventsEmitter<ParticipantEvent>();
+
   /// when the participant joined the room
   DateTime get joinedAt {
     final pi = _participantInfo;
@@ -159,7 +164,7 @@ class Participant extends ChangeNotifier {
 }
 
 // Convenience extension
-extension LKParticipantExt on Participant {
+extension ParticipantExt on Participant {
   List<TrackPublication> get videoTracks =>
       tracks.values.where((e) => e.kind == lk_models.TrackType.VIDEO).toList();
 

lib/src/participant/remote_participant.dart

@@ -1,4 +1,4 @@
-import 'package:flutter_webrtc/flutter_webrtc.dart';
+import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 
 import '../logger.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
@@ -35,7 +35,11 @@ class RemoteParticipant extends Participant {
 
   /// for internal use
   /// {@nodoc}
-  void addSubscribedMediaTrack(MediaStreamTrack mediaTrack, MediaStream stream, String? sid) async {
+  void addSubscribedMediaTrack(
+    rtc.MediaStreamTrack mediaTrack,
+    rtc.MediaStream stream,
+    String? sid,
+  ) async {
     if (sid == null) {
       const msg = 'addSubscribedMediaTrack received null sid';
       delegate?.onTrackSubscriptionFailed(this, '', msg);