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feat: add turn servers #94

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merged 1 commit into from
Dec 19, 2024
Merged

feat: add turn servers #94

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6 changes: 5 additions & 1 deletion lib/.env_example
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Original file line number Diff line number Diff line change
Expand Up @@ -14,4 +14,8 @@ UPLOAD_MEDIA=false

# Sockets Connection
SOCKET_RECONNECT_DELAY_SECONDS=3
EVENT_FAIL_LIMIT=5
EVENT_FAIL_LIMIT=5

# TURN Server
TURN_SERVER_USERNAME=username
TURN_SERVER_CREDENTIAL=password
55 changes: 42 additions & 13 deletions lib/features/chat/services/signaling_service.dart
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Original file line number Diff line number Diff line change
@@ -1,29 +1,54 @@
import 'package:flutter/cupertino.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
import 'package:telware_cross_platform/features/chat/models/message_event_models.dart';
import 'package:telware_cross_platform/features/chat/view_model/event_handler.dart';

typedef StreamStateCallback = void Function(MediaStream stream);
typedef StreamStateCallback = void Function(MediaStream stream, String senderId);
typedef DescriptionCallback = void Function(RTCSessionDescription description, String senderId);
typedef CandidateCallback = void Function(RTCIceCandidate candidate);
typedef ResponseCallback = void Function(dynamic response);

final TURN_SERVER_USERNAME = dotenv.env['TURN_SERVER_USERNAME'] ?? '';
final TURN_SERVER_PASSWORD = dotenv.env['TURN_SERVER_CREDENTIAL'] ?? '';

class Signaling {
final EventHandler _eventHandler = EventHandler.instance;

Map<String, dynamic> configuration = {
'iceServers': [
{
'urls': [
'stun:stun1.l.google.com:19302',
'stun:stun2.l.google.com:19302'
]
}
},
{
'urls': "turn:global.relay.metered.ca:80",
'username': TURN_SERVER_USERNAME,
'credential': TURN_SERVER_PASSWORD,
},
{
'urls': "turn:global.relay.metered.ca:80?transport=tcp",
'username': TURN_SERVER_USERNAME,
'credential': TURN_SERVER_PASSWORD,
},
{
'urls': "turn:global.relay.metered.ca:443",
'username': TURN_SERVER_USERNAME,
'credential': TURN_SERVER_PASSWORD,
},
{
'urls': "turns:global.relay.metered.ca:443?transport=tcp",
'username': TURN_SERVER_USERNAME,
'credential': TURN_SERVER_PASSWORD,
},
]
};

RTCPeerConnection? peerConnection;
MediaStream? localStream;
MediaStream? remoteStream;
Map<String, MediaStream> remoteStreams = {};
StreamStateCallback? onAddRemoteStream;
DescriptionCallback? onOffer;
DescriptionCallback? onAnswer;
Expand Down Expand Up @@ -67,15 +92,15 @@ class Signaling {
return offer;
}

Future<RTCSessionDescription> createAnswer() async {
Future<RTCSessionDescription> createAnswer(String callerId) async {
localStream?.getTracks().forEach((track) {
peerConnection!.addTrack(track, localStream!);
});

peerConnection!.onTrack = (RTCTrackEvent event) async {
debugPrint('Remote stream added');
event.streams[0].getTracks().forEach((track) {
remoteStream!.addTrack(track);
remoteStreams[callerId]!.addTrack(track);
});
};

Expand Down Expand Up @@ -108,8 +133,10 @@ class Signaling {
Future<void> hangUp(RTCVideoRenderer localRenderer) async {
closeUserMedia(localRenderer);

remoteStream?.getTracks().forEach((track) {
track.stop();
remoteStreams.forEach((key, value) {
value.getTracks().forEach((track) {
track.stop();
});
});

if (peerConnection != null) peerConnection!.close();
Expand All @@ -123,7 +150,7 @@ class Signaling {
);

localStream!.dispose();
remoteStream?.dispose();
remoteStreams.clear();
}

void registerPeerConnectionListeners(String calleeId) {
Expand Down Expand Up @@ -162,9 +189,9 @@ class Signaling {
peerConnection!.onTrack = (RTCTrackEvent event) async {
if (event.streams.isNotEmpty) {
for (var track in event.streams[0].getTracks()) {
remoteStream?.addTrack(track);
remoteStreams[calleeId]?.addTrack(track);
}
onAddRemoteStream?.call(event.streams[0]);
onAddRemoteStream?.call(event.streams[0], calleeId);
}
};

Expand All @@ -174,8 +201,8 @@ class Signaling {

peerConnection!.onAddStream = (MediaStream stream) {
debugPrint('Remote stream added');
onAddRemoteStream?.call(stream);
remoteStream = stream;
onAddRemoteStream?.call(stream, calleeId);
remoteStreams[calleeId] = stream;
};
}

Expand Down Expand Up @@ -238,15 +265,17 @@ class Signaling {
);
}

Future<void> openUserMedia(RTCVideoRenderer localRenderer, RTCVideoRenderer remoteRenderer) async {
Future<void> openUserMedia(RTCVideoRenderer localRenderer) async {
var stream = await navigator.mediaDevices.getUserMedia({
'audio': true,
'video': true,
});

localRenderer.srcObject = stream;
localStream = stream;
}

Future<void> updateRemoteRenderer(RTCVideoRenderer remoteRenderer) async {
remoteRenderer.srcObject = await createLocalMediaStream('remoteStream');
}

Expand Down
46 changes: 30 additions & 16 deletions lib/features/chat/view/screens/call_screen.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@ class CallScreen extends ConsumerStatefulWidget {
class _CallScreenState extends ConsumerState<CallScreen> {
final Signaling _signaling = Signaling.instance;
final RTCVideoRenderer _localRenderer = RTCVideoRenderer();
final RTCVideoRenderer _remoteRenderer = RTCVideoRenderer();
final Map<String, RTCVideoRenderer> _remoteRenderers = {};
UserModel? callee;
String? voiceCallId;
late bool isCaller;
Expand All @@ -51,18 +51,18 @@ class _CallScreenState extends ConsumerState<CallScreen> {
isReceivingCall = !isCaller && voiceCallId != null;

_localRenderer.initialize();
_remoteRenderer.initialize();

_signaling.onAddRemoteStream = (stream) {
_remoteRenderer.srcObject = stream;

_signaling.onAddRemoteStream = (stream, clientId) {
_remoteRenderers[clientId]!.srcObject = stream;
setState(() {});
};

// Initialize media just one time
if (_localRenderer.srcObject == null) {
_signaling.openUserMedia(_localRenderer, _remoteRenderer);
_signaling.openUserMedia(_localRenderer);
}
_signaling.toggleVideoStream(false);
_signaling.toggleVideoStream(ref.read(callStateProvider).isVideoCall);

WidgetsBinding.instance.addPostFrameCallback((_) {
if (callee != null && isCaller) {
Expand All @@ -80,16 +80,16 @@ class _CallScreenState extends ConsumerState<CallScreen> {

void _initializeSignaling() {
debugPrint("Call: Initializing signaling");
_signaling.onAddRemoteStream = (stream) {
_remoteRenderer.srcObject = stream;
_signaling.onAddRemoteStream = (stream, clientId) {
_remoteRenderers[clientId]!.srcObject = stream;
setState(() {});
};

_signaling.onOffer = (description, senderId) async {
// If receiving a call, set remote description and create an answer
await _signaling.registerPeerConnection(senderId);
await _signaling.setRemoteDescription(description);
final answer = await _signaling.createAnswer();
final answer = await _signaling.createAnswer(senderId);
_signaling.sendAnswer(answer, senderId);
startCall();
};
Expand All @@ -111,13 +111,18 @@ class _CallScreenState extends ConsumerState<CallScreen> {
};

_signaling.onReceiveJoinedCall = (response) {
// Create an offer to the user
_signaling.createOffer(response['clientId']).then((offer) {
_signaling.sendOffer(offer, response['clientId']);
final clientId = response['clientId'];
print("# Call: Received joined call from $clientId");
_remoteRenderers[clientId] = RTCVideoRenderer();
_remoteRenderers[clientId]!.initialize();
_signaling.updateRemoteRenderer(_remoteRenderers[clientId]!).then((_) {
_signaling.createOffer(clientId).then((offer) {
_signaling.sendOffer(offer, response['clientId']);
});

if (ref.read(callStateProvider).isCallInProgress) return;
ref.read(callStateProvider.notifier).setCallInProgress(true);
});

if (ref.read(callStateProvider).isCallInProgress) return;
ref.read(callStateProvider.notifier).setCallInProgress(true);
};

_signaling.onReceiveLeftCall = (response) {
Expand Down Expand Up @@ -162,7 +167,16 @@ class _CallScreenState extends ConsumerState<CallScreen> {
children: [
// Remote video
if (callState.isVideoCall)
Positioned.fill(child: RTCVideoView(_remoteRenderer))
// Display all remote renderers as cubes beside each other
Row(
children: _remoteRenderers.values
.map((renderer) => SizedBox(
width: 100,
height: 150,
child: RTCVideoView(renderer),
))
.toList(),
)
else
Container(
decoration: BoxDecoration(
Expand Down
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