Release camera/mic when muted, restartTrack when unmuted (#39)

* re-structure tracks

* publication.track is now a LocalTrack or RemoteTrack

* restartTrack when unmute

* stop/start on restartTrack

* move to mute/unmute

* format

* remove comment

example/lib/widgets/controls.dart

@@ -104,10 +104,9 @@ class _ControlsWidgetState extends State<ControlsWidget> {
       await FlutterBackground.initialize(androidConfig: androidConfig);
       await FlutterBackground.enableBackgroundExecution();
 
-      final screenTrack =
+      final screenShareTrack = await LocalVideoTrack.createScreenShareTrack();
-          await LocalVideoTrack.createScreenTrack(); // Defaults to camera
       await widget.room.localParticipant.publishVideoTrack(
-        screenTrack,
+        screenShareTrack,
       );
     } catch (e) {
       print('could not publish video: $e');

lib/livekit_client.dart

@@ -16,10 +16,10 @@ export 'src/room.dart';
 export 'src/track/local_audio_track.dart';
 export 'src/track/local_track_publication.dart';
 export 'src/track/local_video_track.dart';
+export 'src/track/local_track.dart';
 export 'src/track/options.dart';
 export 'src/track/remote_track_publication.dart';
 export 'src/track/track.dart';
 export 'src/track/track_publication.dart';
-export 'src/track/video_track.dart';
 export 'src/types.dart';
 export 'src/widget/video_track_renderer.dart';

lib/src/participant/local_participant.dart

@@ -279,7 +279,7 @@ extension LocalParticipantTrackSourceExt on LocalParticipant {
         final track = await LocalAudioTrack.create();
         await publishAudioTrack(track);
       } else if (source == TrackSource.screenShareVideo) {
-        final track = await LocalVideoTrack.createScreenTrack();
+        final track = await LocalVideoTrack.createScreenShareTrack();
         await publishVideoTrack(track);
       }
     }

lib/src/participant/remote_participant.dart

@@ -104,10 +104,10 @@ class RemoteParticipant extends Participant {
     final Track track;
     if (pub.kind == lk_models.TrackType.AUDIO) {
       // audio track
-      track = RemoteAudioTrack(pub.source, pub.name, mediaTrack, stream);
+      track = RemoteAudioTrack(pub.name, pub.source, stream, mediaTrack);
     } else {
       // video track
-      track = RemoteVideoTrack(pub.source, pub.name, mediaTrack, stream);
+      track = RemoteVideoTrack(pub.name, pub.source, stream, mediaTrack);
     }
 
     await track.start();

lib/src/track/audio_management.dart

@@ -1,16 +1,14 @@
 // import 'package:audio_session/audio_session.dart' as _as;
+
 import 'dart:io';
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 import 'package:synchronized/synchronized.dart' as sync;
 
 import '../logger.dart';
-import '../proto/livekit_models.pb.dart' as lk_models;
 import '../support/native_audio.dart';
-import '../types.dart';
 import 'local_audio_track.dart';
-import 'track.dart';
+import 'local_track.dart';
 
 enum AudioTrackState {
   none,
@@ -22,7 +20,7 @@ enum AudioTrackState {
 typedef ConfigureNativeAudioFunc = Future<NativeAudioConfiguration> Function(
     AudioTrackState state);
 
-abstract class AudioTrack extends Track {
+mixin AudioManagementMixin on AudioTrack {
   // it's possible to set custom function here to customize audio session configuration
   static ConfigureNativeAudioFunc nativeAudioConfigurationForAudioTrackState =
       defaultNativeAudioConfigurationFunc;
@@ -32,20 +30,6 @@ abstract class AudioTrack extends Track {
   static int _localTrackCount = 0;
   static int _remoteTrackCount = 0;
 
-  rtc.MediaStream? mediaStream;
-
-  AudioTrack(
-    TrackSource source,
-    String name,
-    rtc.MediaStreamTrack track,
-    this.mediaStream,
-  ) : super(
-          lk_models.TrackType.AUDIO,
-          source,
-          name,
-          track,
-        );
-
   /// Start playing audio track. On web platform, create an audio element and
   /// start playback
   @override
@@ -149,17 +133,6 @@ Future<NativeAudioConfiguration> defaultNativeAudioConfigurationFunc(
     );
   }
 
-  // TODO: .record category causes exception in WebRTC lib for unknown reason
-  // if (this == AudioTrackState.localOnly) {
-  //   return NativeAudioConfiguration(
-  //     iosCategory: IosAudioCategory.record,
-  //     iosCategoryOptions: {
-  //       // IosAudioCategoryOption.allowBluetooth,
-  //     },
-  //     iosMode: IosAudioMode.spokenAudio,
-  //   );
-  // }
-
   return NativeAudioConfiguration(
     appleAudioCategory: AppleAudioCategory.soloAmbient,
     appleAudioCategoryOptions: {},

lib/src/track/local_audio_track.dart

@@ -2,50 +2,45 @@ import 'dart:async';
 
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 
-import '../exceptions.dart';
+import '../proto/livekit_models.pb.dart' as lk_models;
-import '../logger.dart';
 import '../types.dart';
-import 'audio_track.dart';
+import 'audio_management.dart';
 import 'local_track.dart';
 import 'options.dart';
 
-class LocalAudioTrack extends AudioTrack with LocalTrack {
+class LocalAudioTrack extends LocalTrack with AudioTrack, AudioManagementMixin {
+  // Options used for this track
+  @override
+  covariant LocalAudioTrackOptions currentOptions;
+
   // private constructor
   LocalAudioTrack._(
-    TrackSource source,
     String name,
-    rtc.MediaStreamTrack track,
+    TrackSource source,
     rtc.MediaStream stream,
-  ) : super(source, name, track, stream);
+    rtc.MediaStreamTrack track,
+    this.currentOptions,
+  ) : super(
+          name,
+          lk_models.TrackType.AUDIO,
+          source,
+          stream,
+          track,
+        );
 
   /// Creates a new audio track from the default audio input device.
-  static Future<LocalAudioTrack> create(
+  static Future<LocalAudioTrack> create([
-      [LocalAudioTrackOptions? options]) async {
+    LocalAudioTrackOptions? options,
-    final audioConstraints = options?.toMediaConstraintsMap() ??
+  ]) async {
-        const LocalAudioTrackOptions().toMediaConstraintsMap();
+    options ??= const LocalAudioTrackOptions();
-    final stream =
+    final stream = await LocalTrack.createStream(options);
-        await rtc.navigator.mediaDevices.getUserMedia(<String, dynamic>{
-      'audio': audioConstraints,
-      'video': false,
-    });
-
-    if (stream.getAudioTracks().isEmpty) throw TrackCreateException();
 
     return LocalAudioTrack._(
-      TrackSource.microphone,
       '',
-      stream.getAudioTracks().first,
+      TrackSource.microphone,
       stream,
+      stream.getAudioTracks().first,
+      options,
     );
   }
-
-  @override
-  Future<bool> stop() async {
-    final didStop = await super.stop();
-    if (didStop) {
-      logger.fine('Stopping mediaStreamTrack...');
-      await mediaStreamTrack.stop();
-    }
-    return didStop;
-  }
 }

lib/src/track/local_track.dart

@@ -1,13 +1,41 @@
+import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
+import 'package:meta/meta.dart';
+
+import '../exceptions.dart';
 import '../internal/events.dart';
 import '../logger.dart';
+import '../proto/livekit_models.pb.dart' as lk_models;
+import '../types.dart';
+import 'options.dart';
 import 'track.dart';
 
-mixin LocalTrack on Track {
+mixin VideoTrack on Track {}
+mixin AudioTrack on Track {}
+
+abstract class LocalTrack extends Track {
+  // Options used for this track
+  abstract LocalTrackOptions currentOptions;
+
+  LocalTrack(
+    String name,
+    lk_models.TrackType kind,
+    TrackSource source,
+    rtc.MediaStream mediaStream,
+    rtc.MediaStreamTrack mediaStreamTrack,
+  ) : super(
+          name,
+          kind,
+          source,
+          mediaStream,
+          mediaStreamTrack,
+        );
+
   // only local tracks can set muted
   Future<void> mute() async {
     logger.fine('LocalTrack.mute() muted: $muted');
     if (muted) return;
     await disable();
+    await stop();
     updateMuted(true);
     events.emit(TrackMuteUpdatedEvent(track: this, muted: muted));
   }
@@ -15,8 +43,82 @@ mixin LocalTrack on Track {
   Future<void> unmute() async {
     logger.fine('LocalTrack.unmute() muted: $muted');
     if (!muted) return;
+    await restartTrack();
     await enable();
     updateMuted(false);
     events.emit(TrackMuteUpdatedEvent(track: this, muted: muted));
   }
+
+  @override
+  Future<bool> stop() async {
+    final didStop = await super.stop();
+    if (didStop) {
+      logger.fine('Stopping mediaStreamTrack...');
+      await mediaStreamTrack.stop();
+      await mediaStream.dispose();
+    }
+    return didStop;
+  }
+
+  /// Creates a [rtc.MediaStream] from LocalTrackOptions.
+  @internal
+  static Future<rtc.MediaStream> createStream(
+    LocalTrackOptions options,
+  ) async {
+    final constraints = <String, dynamic>{
+      'audio': options is LocalAudioTrackOptions
+          ? options.toMediaConstraintsMap()
+          : false,
+      'video': options is LocalVideoTrackOptions
+          ? options.toMediaConstraintsMap()
+          : false,
+    };
+
+    final rtc.MediaStream stream;
+    if (options is ScreenShareTrackOptions) {
+      stream = await rtc.navigator.mediaDevices.getDisplayMedia(constraints);
+    } else {
+      // options is CameraVideoTrackOptions
+      stream = await rtc.navigator.mediaDevices.getUserMedia(constraints);
+    }
+
+    // Check if the stream looks good
+    if ((options is LocalVideoTrackOptions &&
+            stream.getVideoTracks().isEmpty) ||
+        (options is LocalAudioTrackOptions &&
+            stream.getAudioTracks().isEmpty)) {
+      throw TrackCreateException(
+          'Failed to create stream, at least 1 video or audio track should exist');
+    }
+    return stream;
+  }
+
+  /// Restarts the track with new options. This is useful when switching between
+  /// front and back cameras.
+  Future<void> restartTrack([
+    LocalTrackOptions? options,
+  ]) async {
+    if (sender == null) throw TrackCreateException('could not restart track');
+    if (options != null && currentOptions.runtimeType != options.runtimeType) {
+      throw Exception('options must be a ${currentOptions.runtimeType}');
+    }
+
+    currentOptions = options ?? currentOptions;
+
+    // stop if not already stopped...
+    await stop();
+
+    // create new track with options
+    final newStream = await LocalTrack.createStream(currentOptions);
+    final newTrack = newStream.getTracks().first;
+
+    // replace track on sender
+    await sender?.replaceTrack(newTrack);
+
+    // set new stream & track to this object
+    updateMediaStreamAndTrack(newStream, newTrack);
+
+    // mark as started
+    await start();
+  }
 }

lib/src/track/local_track_publication.dart

@@ -10,6 +10,9 @@ import 'track_publication.dart';
 class LocalTrackPublication extends TrackPublication {
   final LocalParticipant _participant;
 
+  @override
+  covariant LocalTrack? track;
+
   LocalTrackPublication(
     lk_models.TrackInfo info,
     Track track,

lib/src/track/local_video_track.dart

@@ -1,73 +1,45 @@
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 
-import '../exceptions.dart';
 import '../logger.dart';
+import '../proto/livekit_models.pb.dart' as lk_models;
 import '../types.dart';
 import 'local_track.dart';
 import 'options.dart';
 import 'track.dart';
-import 'video_track.dart';
 
 /// A video track from the local device. Use static methods in this class to create
 /// video tracks.
-class LocalVideoTrack extends VideoTrack with LocalTrack {
+class LocalVideoTrack extends LocalTrack with VideoTrack {
-  //
   // Options used for this track
-  //
+  @override
-  LocalVideoTrackOptions currentOptions;
+  covariant LocalVideoTrackOptions currentOptions;
 
-  //
   // Private constructor
-  //
   LocalVideoTrack._(
-    TrackSource source,
     String name,
-    rtc.MediaStreamTrack mediaTrack,
+    TrackSource source,
     rtc.MediaStream stream,
+    rtc.MediaStreamTrack track,
     this.currentOptions,
-  ) : super(source, name, mediaTrack, stream);
+  ) : super(
-
+          name,
-  rtc.RTCRtpSender? get sender => transceiver?.sender;
+          lk_models.TrackType.VIDEO,
-
+          source,
-  /// Restarts the track with new options. This is useful when switching between
+          stream,
-  /// front and back cameras.
+          track,
-  Future<void> restartTrack([
+        );
-    LocalVideoTrackOptions? options,
-  ]) async {
-    if (sender == null) throw TrackCreateException('could not restart track');
-    if (options != null && currentOptions.runtimeType != options.runtimeType) {
-      throw Exception('options must be a ${currentOptions.runtimeType}');
-    }
-
-    currentOptions = options ?? currentOptions;
-
-    // stop the current track & stream
-    await mediaStreamTrack.stop();
-    await mediaStream.dispose();
-
-    // create new track with options
-    final newStream = await _createStream(currentOptions);
-    final newTrack = newStream.getVideoTracks().first;
-
-    // replace track on sender
-    await sender?.replaceTrack(newTrack);
-
-    // set new stream & track to this object
-    setMediaStream(newStream);
-    mediaStreamTrack = newTrack;
-  }
 
   /// Creates a LocalVideoTrack from camera input.
   static Future<LocalVideoTrack> createCameraTrack([
     CameraTrackOptions? options,
   ]) async {
     options ??= const CameraTrackOptions();
-    final stream = await _createStream(options);
+    final stream = await LocalTrack.createStream(options);
     return LocalVideoTrack._(
-      TrackSource.camera,
       Track.cameraName,
-      stream.getVideoTracks().first,
+      TrackSource.camera,
       stream,
+      stream.getVideoTracks().first,
       options,
     );
   }
@@ -76,49 +48,19 @@ class LocalVideoTrack extends VideoTrack with LocalTrack {
   ///
   /// Note: Android requires a foreground service to be started prior to
   /// creating a screen track. Refer to the example app for an implementation.
-  static Future<LocalVideoTrack> createScreenTrack([
+  static Future<LocalVideoTrack> createScreenShareTrack([
-    ScreenTrackOptions? options,
+    ScreenShareTrackOptions? options,
   ]) async {
-    options ??= const ScreenTrackOptions();
+    options ??= const ScreenShareTrackOptions();
-    final stream = await _createStream(options);
+    final stream = await LocalTrack.createStream(options);
     return LocalVideoTrack._(
-      TrackSource.screenShareVideo,
       Track.screenShareName,
-      stream.getVideoTracks().first,
+      TrackSource.screenShareVideo,
       stream,
+      stream.getVideoTracks().first,
       options,
     );
   }
-
-  static Future<rtc.MediaStream> _createStream(
-    LocalVideoTrackOptions options,
-  ) async {
-    final constraints = <String, dynamic>{
-      'audio': false,
-      'video': options.toMediaConstraintsMap(),
-    };
-
-    final rtc.MediaStream stream;
-    if (options is ScreenTrackOptions) {
-      stream = await rtc.navigator.mediaDevices.getDisplayMedia(constraints);
-    } else {
-      // options is CameraVideoTrackOptions
-      stream = await rtc.navigator.mediaDevices.getUserMedia(constraints);
-    }
-
-    if (stream.getVideoTracks().isEmpty) throw TrackCreateException();
-    return stream;
-  }
-
-  @override
-  Future<bool> stop() async {
-    final didStop = await super.stop();
-    if (didStop) {
-      logger.fine('Stopping mediaStreamTrack...');
-      await mediaStreamTrack.stop();
-    }
-    return didStop;
-  }
 }
 
 //

lib/src/track/options.dart

@@ -43,12 +43,19 @@ class CameraTrackOptions extends LocalVideoTrackOptions {
       );
 }
 
-class ScreenTrackOptions extends LocalVideoTrackOptions {
+class ScreenShareTrackOptions extends LocalVideoTrackOptions {
-  const ScreenTrackOptions();
+  const ScreenShareTrackOptions();
+}
+
+/// Base class for track options.
+abstract class LocalTrackOptions {
+  const LocalTrackOptions();
+  // All subclasses must be able to report constraints
+  Map<String, dynamic> toMediaConstraintsMap();
 }
 
 /// Options when creating a LocalVideoTrack.
-abstract class LocalVideoTrackOptions {
+abstract class LocalVideoTrackOptions extends LocalTrackOptions {
   // final LocalVideoTrackType type;
   final VideoParameters params;
 
@@ -56,6 +63,7 @@ abstract class LocalVideoTrackOptions {
     this.params = VideoParameters.presetQHD169,
   });
 
+  @override
   Map<String, dynamic> toMediaConstraintsMap() => <String, dynamic>{
         'mandatory': params.toMediaConstraintsMap(),
       };
@@ -235,7 +243,7 @@ class VideoParameters {
 }
 
 /// Options when creating an LocalAudioTrack. Placeholder for now.
-class LocalAudioTrackOptions {
+class LocalAudioTrackOptions extends LocalTrackOptions {
   final bool noiseSuppression;
   final bool echoCancellation;
   final bool autoGainControl;
@@ -250,6 +258,7 @@ class LocalAudioTrackOptions {
     this.typingNoiseDetection = true,
   });
 
+  @override
   Map<String, dynamic> toMediaConstraintsMap() => <String, dynamic>{
         'optional': <Map<String, dynamic>>[
           <String, dynamic>{'echoCancellation': echoCancellation},

lib/src/track/remote_audio_track.dart

@@ -1,16 +1,27 @@
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
+
+import '../proto/livekit_models.pb.dart' as lk_models;
 import '../types.dart';
 import '_audio_api.dart' if (dart.library.html) '_audio_html.dart' as audio;
-import 'audio_track.dart';
+import 'audio_management.dart';
+import 'local_track.dart';
+import 'remote_track.dart';
 
-class RemoteAudioTrack extends AudioTrack {
+class RemoteAudioTrack extends RemoteTrack
+    with AudioTrack, AudioManagementMixin {
   //
   RemoteAudioTrack(
-    TrackSource source,
     String name,
-    rtc.MediaStreamTrack track,
+    TrackSource source,
     rtc.MediaStream stream,
-  ) : super(source, name, track, stream);
+    rtc.MediaStreamTrack track,
+  ) : super(
+          name,
+          lk_models.TrackType.AUDIO,
+          source,
+          stream,
+          track,
+        );
 
   @override
   Future<bool> start() async {
@@ -18,7 +29,6 @@ class RemoteAudioTrack extends AudioTrack {
     if (didStart) {
       // web support
       audio.startAudio(getCid(), mediaStreamTrack);
-      await enable();
     }
     return didStart;
   }
@@ -29,7 +39,6 @@ class RemoteAudioTrack extends AudioTrack {
     if (didStop) {
       // web support
       audio.stopAudio(getCid());
-      await disable();
     }
     return didStop;
   }

lib/src/track/remote_track.dart

@@ -0,0 +1,39 @@
+import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
+
+import '../proto/livekit_models.pb.dart' as lk_models;
+import '../types.dart';
+import 'track.dart';
+
+abstract class RemoteTrack extends Track {
+  RemoteTrack(
+    String name,
+    lk_models.TrackType kind,
+    TrackSource source,
+    rtc.MediaStream stream,
+    rtc.MediaStreamTrack track,
+  ) : super(
+          name,
+          kind,
+          source,
+          stream,
+          track,
+        );
+
+  @override
+  Future<bool> start() async {
+    final didStart = await super.start();
+    if (didStart) {
+      await enable();
+    }
+    return didStart;
+  }
+
+  @override
+  Future<bool> stop() async {
+    final didStop = await super.stop();
+    if (didStop) {
+      await disable();
+    }
+    return didStop;
+  }
+}

lib/src/track/remote_track_publication.dart

@@ -12,6 +12,7 @@ import '../participant/remote_participant.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
 import '../proto/livekit_rtc.pb.dart' as lk_rtc;
 import '../utils.dart';
+import 'remote_track.dart';
 import 'track.dart';
 import 'track_publication.dart';
 
@@ -31,6 +32,9 @@ class RendererVisibility {
 /// Represents a track publication from a RemoteParticipant. Provides methods to
 /// control if we should subscribe to the track, and its quality (for video).
 class RemoteTrackPublication extends TrackPublication {
+  @override
+  covariant RemoteTrack? track;
+
   final RemoteParticipant _participant;
   bool _enabled = true;
   lk_rtc.VideoQuality _videoQuality = lk_rtc.VideoQuality.HIGH;

lib/src/track/remote_video_track.dart

@@ -1,32 +1,22 @@
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
+import 'package:livekit_client/src/track/local_track.dart';
 
-import '../track/video_track.dart';
+import '../proto/livekit_models.pb.dart' as lk_models;
 import '../types.dart';
+import 'remote_track.dart';
 
-class RemoteVideoTrack extends VideoTrack {
+class RemoteVideoTrack extends RemoteTrack with VideoTrack {
   //
   RemoteVideoTrack(
-    TrackSource source,
     String name,
-    rtc.MediaStreamTrack mediaTrack,
+    TrackSource source,
     rtc.MediaStream stream,
-  ) : super(source, name, mediaTrack, stream);
+    rtc.MediaStreamTrack track,
-
+  ) : super(
-  @override
+          name,
-  Future<bool> start() async {
+          lk_models.TrackType.VIDEO,
-    final didStart = await super.start();
+          source,
-    if (didStart) {
+          stream,
-      await enable();
+          track,
-    }
+        );
-    return didStart;
-  }
-
-  @override
-  Future<bool> stop() async {
-    final didStop = await super.stop();
-    if (didStop) {
-      await disable();
-    }
-    return didStop;
-  }
 }

lib/src/track/track.dart

@@ -5,6 +5,7 @@ import 'package:uuid/uuid.dart';
 
 import '../events.dart';
 import '../extensions.dart';
+import '../internal/events.dart';
 import '../logger.dart';
 import '../managers/event.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
@@ -23,7 +24,14 @@ abstract class Track extends DisposableChangeNotifier
   final String name;
   final lk_models.TrackType kind;
   final TrackSource source;
-  rtc.MediaStreamTrack mediaStreamTrack;
+
+  // read only
+  rtc.MediaStream get mediaStream => _mediaStream;
+  rtc.MediaStream _mediaStream;
+
+  // read only
+  rtc.MediaStreamTrack get mediaStreamTrack => _mediaStreamTrack;
+  rtc.MediaStreamTrack _mediaStreamTrack;
 
   String? sid;
   rtc.RTCRtpTransceiver? transceiver;
@@ -36,11 +44,14 @@ abstract class Track extends DisposableChangeNotifier
   bool _muted = false;
   bool get muted => _muted;
 
+  rtc.RTCRtpSender? get sender => transceiver?.sender;
+
   Track(
+    this.name,
     this.kind,
     this.source,
-    this.name,
+    this._mediaStream,
-    this.mediaStreamTrack,
+    this._mediaStreamTrack,
   ) {
     // Any event emitted will trigger ChangeNotifier
     events.listen((event) {
@@ -128,4 +139,15 @@ abstract class Track extends DisposableChangeNotifier
 
   @internal
   void updateMuted(bool muted) => _muted = muted;
+
+  @internal
+  void updateMediaStreamAndTrack(
+      rtc.MediaStream stream, rtc.MediaStreamTrack track) {
+    _mediaStream = stream;
+    _mediaStreamTrack = track;
+    events.emit(TrackStreamUpdatedEvent(
+      track: this,
+      stream: stream,
+    ));
+  }
 }

lib/src/track/track_publication.dart

@@ -18,8 +18,8 @@ abstract class TrackPublication extends Disposable {
   final lk_models.TrackType kind;
   final TrackSource source;
 
-  Track? _track;
+  abstract Track? track;
-  Track? get track => _track;
+  // Track? get track => _track;
 
   // metadata-muted
   bool _muted = false;
@@ -28,7 +28,7 @@ abstract class TrackPublication extends Disposable {
   bool simulcasted = false;
   TrackDimension? dimension;
 
-  bool get subscribed => _track != null;
+  bool get subscribed => track != null;
 
   TrackPublication.fromInfo(lk_models.TrackInfo info)
       : sid = info.sid,
@@ -66,10 +66,10 @@ abstract class TrackPublication extends Disposable {
   // Intended for internal use only.
   @internal
   Future<bool> updateTrack(Track? newValue) async {
-    if (_track == newValue) return false;
+    if (track == newValue) return false;
     // dispose previous track (if exists)
-    await _track?.dispose();
+    await track?.dispose();
-    _track = newValue;
+    track = newValue;
     return true;
   }
 }

lib/src/track/video_track.dart

@@ -1,47 +0,0 @@
-import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
-import 'package:meta/meta.dart';
-
-import '../internal/events.dart';
-import '../proto/livekit_models.pb.dart' as lk_models;
-import '../types.dart';
-import 'track.dart';
-
-/// A video track will notify when its mediaTrack has changed.
-abstract class VideoTrack extends Track {
-  rtc.MediaStream _mediaStream;
-
-  VideoTrack(
-    TrackSource source,
-    String name,
-    rtc.MediaStreamTrack mediaTrack,
-    this._mediaStream,
-  ) : super(
-          lk_models.TrackType.VIDEO,
-          source,
-          name,
-          mediaTrack,
-        );
-
-  rtc.MediaStream get mediaStream => _mediaStream;
-
-  /// internal use
-  /// {@nodoc}
-  @internal
-  void setMediaStream(rtc.MediaStream stream) {
-    _mediaStream = stream;
-    events.emit(TrackStreamUpdatedEvent(
-      track: this,
-      stream: stream,
-    ));
-  }
-
-  @override
-  Future<bool> stop() async {
-    final didStop = await super.stop();
-    if (didStop) {
-      await _mediaStream.dispose();
-    }
-    // _mediaStream = null;
-    return didStop;
-  }
-}

lib/src/widget/video_track_renderer.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
+import 'package:livekit_client/src/track/local_track.dart';
 import 'package:visibility_detector/visibility_detector.dart';
 
 import '../events.dart';
@@ -9,7 +10,6 @@ import '../internal/events.dart';
 import '../logger.dart';
 import '../managers/event.dart';
 import '../track/local_video_track.dart';
-import '../track/video_track.dart';
 
 /// Widget that renders a [VideoTrack].
 class VideoTrackRenderer extends StatefulWidget {