-
Notifications
You must be signed in to change notification settings - Fork 27
/
helper.dart
740 lines (661 loc) · 22.3 KB
/
helper.dart
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
// ignore_for_file: non_constant_identifier_names, unnecessary_this, curly_braces_in_flow_control_structures, unnecessary_new, avoid_print, prefer_const_constructors, constant_identifier_names, prefer_collection_literals, prefer_generic_function_type_aliases, prefer_final_fields, unnecessary_string_interpolations, prefer_interpolation_to_compose_strings
import 'dart:async';
import 'dart:convert';
import 'package:ant_media_flutter/ant_media_flutter.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
import '../utils/websocket.dart'
if (dart.library.js) '../utils/websocket_web.dart';
// AntHelper is an interface to the Flutter SDK of Ant Media Server
class AntHelper {
MediaStream? _localStream;
final List<RTCRtpSender> _senders = <RTCRtpSender>[];
final List<MediaStream> _remoteStreams = [];
final HelperStateCallback onStateChange;
final StreamStateCallback onLocalStream;
final StreamStateCallback onAddRemoteStream;
final StreamStateCallback onRemoveRemoteStream;
final DataChannelMessageCallback onDataChannelMessage;
final DataChannelCallback onDataChannel;
final ConferenceUpdateCallback onupdateConferencePerson;
final Callbacks callbacks;
final bool userScreen;
final String _streamId;
final String _roomId;
final String _token;
final String _host;
// Max video and audio bitrate in kbps. Default: Unlimited
int maxVideoBitrate = -1;
int maxAudioBitrate = -1;
late final Map<String, dynamic> _config;
Timer? _ping;
bool _mute = false;
AntMediaType _type = AntMediaType.Default;
bool DataChannelOnly = false;
final List<Map<String, String>> iceServers;
final List<Object> videoTrackAssignments = [];
final Map<String, dynamic> allParticipants = {};
// Constructor for AntHelper
AntHelper(
this._host,
this._streamId,
this._roomId,
this._token,
this.onStateChange,
this.onAddRemoteStream,
this.onDataChannel,
this.onDataChannelMessage,
this.onLocalStream,
this.onRemoveRemoteStream,
this.userScreen,
this.onupdateConferencePerson,
this.iceServers,
this.callbacks,
) {
final config = {
"sdpSemantics": "unified-plan",
'iceServers': iceServers,
'mandatory': {},
'optional': [
{'DtlsSrtpKeyAgreement': true},
],
};
if (_type == AntMediaType.DataChannelOnly) DataChannelOnly = true;
_config = config;
}
final JsonEncoder _encoder = JsonEncoder();
SimpleWebSocket? _socket;
final Map<String, RTCPeerConnection> _peerConnections = {};
RTCDataChannel? _dataChannel;
final List<RTCIceCandidate> _remoteCandidates = [];
final Map<String, MediaStream> mediaStreamList = {};
final Map<String, dynamic> _constraints = {
'mandatory': {
'OfferToReceiveAudio': true,
'OfferToReceiveVideo': true,
},
'optional': [],
};
final Map<String, dynamic> _dc_constraints = {
'mandatory': {
'OfferToReceiveAudio': false,
'OfferToReceiveVideo': false,
},
'optional': [],
};
// Dispose local stream and close peer and websocket connections
void close() {
_localStream?.dispose();
_localStream = null;
_peerConnections.forEach((key, pc) {
pc.close();
});
_socket?.close();
}
// Switch camera for the local stream
Future<void> switchCamera() async {
if (_localStream != null) {
final videoTrack = _localStream!
.getVideoTracks()
.firstWhere((track) => track.kind == 'video');
Helper.switchCamera(videoTrack);
}
}
// Mute or unmute the local stream
Future<void> muteMic(bool mute) async {
if (_localStream != null) {
final audioTrack = _localStream!
.getAudioTracks()
.firstWhere((track) => track.kind == 'audio');
Helper.setMicrophoneMute(mute, audioTrack);
}
}
// Toggle the camera on or off
Future<void> toggleCam(bool state) async {
if (_localStream != null) {
final videoTrack = _localStream!
.getVideoTracks()
.firstWhere((track) => track.kind == 'video');
videoTrack.enabled = state;
}
}
// Stop publishing the stream
void bye() {
final request = {
'command': 'stop',
'streamId': _streamId,
};
_sendAntMedia(request);
}
// Stop a peer connection
void disconnectPeer() {
final request = {
'streamId': _streamId,
'command': 'leave',
};
_sendAntMedia(request);
}
// Receive sender tracks
Future<RTCRtpSender?> getSender(String streamId, String type) async {
final connection = _peerConnections[streamId];
if (connection != null) {
final senders = await connection.getSenders();
for (final sender in senders) {
if (sender.track!.kind == type) {
return sender;
}
}
}
return null;
}
// Limit maximum bitrate for audio or video type
Future<bool> setMaxBitrate(
String streamId, String type, int maxBitrateKbps) async {
final sender = await getSender(streamId, type);
if (sender != null) {
final parameters = sender.parameters;
parameters.encodings?[0].maxBitrate = maxBitrateKbps * 1000;
await sender.setParameters(parameters);
return true;
}
return false;
}
void onMessage(Map<String, dynamic> mapData) async {
final command = mapData['command'];
print('current command is $command');
switch (command) {
case 'start':
final id = mapData['streamId'];
onStateChange(HelperState.CallStateNew);
_peerConnections[id] =
await _createPeerConnection(id, 'publish', userScreen);
await _createDataChannel(_streamId, _peerConnections[_streamId]!);
await _createOfferAntMedia(id, _peerConnections[id]!, 'publish');
break;
case 'takeConfiguration':
final id = mapData['streamId'];
final type = mapData['type'];
var sdp = mapData['sdp'];
final isTypeOffer = type == 'offer';
sdp = sdp.replaceAll("a=extmap:13 urn:3gpp:video-orientation\r\n", "");
final dataChannelMode = isTypeOffer ? "play" : "publish";
print(
"Flutter setRemoteDescription: $sdp for streamId: $id and type: $type");
try {
if (_peerConnections[id] == null) {
_peerConnections[id] =
await _createPeerConnection(id, dataChannelMode, userScreen);
if (isTypeOffer) {
await _createDataChannel(id, _peerConnections[id]!);
}
}
await _peerConnections[id]!
.setRemoteDescription(RTCSessionDescription(sdp, type));
print("Remote description set successfully for streamId: $id");
for (final candidate in _remoteCandidates) {
await _peerConnections[id]!.addCandidate(candidate);
}
_remoteCandidates.clear();
if (isTypeOffer) {
print("Creating answer for streamId: $id");
final answer =
await _peerConnections[id]!.createAnswer(_dc_constraints);
await _peerConnections[id]!.setLocalDescription(answer);
final sdpWithStereo = answer.sdp!
.replaceAll("useinbandfec=1", "useinbandfec=1; stereo=1");
final request = {
'command': 'takeConfiguration',
'streamId': id,
'type': answer.type,
'sdp': sdpWithStereo,
};
_sendAntMedia(request);
print("Answer created and sent for streamId: $id");
}
} catch (error) {
print("Error setting remote description for streamId: $id: $error");
if (error.toString().contains("InvalidAccessError") ||
error.toString().contains("setRemoteDescription")) {
print(
"Error: Codec incompatibility or other issue setting remote description for streamId: $id");
}
}
break;
case 'stop':
closePeerConnection(_streamId);
break;
case 'takeCandidate':
final id = mapData['streamId'];
final candidate = RTCIceCandidate(
mapData['candidate'], mapData['id'], mapData['label']);
if (_peerConnections[id] != null) {
await _peerConnections[id]!.addCandidate(candidate);
} else {
_remoteCandidates.add(candidate);
}
break;
case 'error':
if (mapData['definition'] == 'no_stream_exist') {
if (_type == AntMediaType.Conference) {
Timer(Duration(seconds: 5), () {
play(_roomId, "", _roomId, [], "", "", "");
});
} else if (_type == AntMediaType.Play) {
Timer(Duration(seconds: 5), () {
play(_streamId, "", _roomId, [], "", "", "");
});
}
} else {
print(mapData['definition']);
onStateChange(HelperState.ConnectionError);
}
break;
case 'notification':
final decoder = JsonDecoder();
if (mapData['definition'] == 'play_finished' &&
_type == AntMediaType.Conference) {
Timer(Duration(seconds: 5), () {
play(_roomId, "", _roomId, [], "", "", "");
});
} else if (mapData['definition'] == 'publish_finished' ||
mapData['definition'] == 'play_finished') {
closePeerConnection(_streamId);
} else if (mapData['definition'] == 'play_started' &&
_type == AntMediaType.Conference) {
_getBroadcastObject(_roomId);
} else if (mapData['definition'] == 'broadcastObject' &&
_type == AntMediaType.Conference) {
final broadcastObject = decoder.convert(mapData['broadcast']);
if (mapData['streamId'] == _roomId) {
_handleMainTrackBroadcastObject(broadcastObject);
} else {
_handleSubTrackBroadcastObject(broadcastObject);
}
callbacks(command, mapData);
print("$command${mapData['broadcast']}");
} else if (mapData['definition'] == 'data_received') {
final notificationEvent = decoder.convert(mapData['data']);
_handleNotificationEvent(notificationEvent);
}
break;
case 'pong':
print(command);
break;
case 'trackList':
print("$command $mapData");
break;
case 'connectWithNewId':
if (_type == AntMediaType.Play ||
_type == AntMediaType.Peer ||
_type == AntMediaType.Conference) {
join(_streamId);
}
break;
case 'peerMessageCommand':
print("$command $mapData");
break;
}
}
Future<void> connect(AntMediaType type) async {
_type = type;
final url = '$_host';
_socket = SimpleWebSocket(url);
if (_type == AntMediaType.DataChannelOnly) DataChannelOnly = true;
print('connect to $url');
_socket?.onOpen = () {
print('onOpen');
onStateChange(HelperState.ConnectionOpen);
if (_type == AntMediaType.Publish) {
publish(_streamId, _token, "", "", _streamId, "", "");
} else if (_type == AntMediaType.DataChannelOnly) {
publish(_streamId, _token, "", "", _streamId, "", "");
play(_streamId, _token, "", [], "", "", "");
} else if (_type == AntMediaType.Conference) {
publish(_streamId, _token, "", "", _streamId, _roomId, "");
play(_roomId, _token, _roomId, [], "", "", "");
} else if (_type == AntMediaType.Play) {
play(_streamId, _token, "", [], "", "", "");
} else if (_type == AntMediaType.Peer) {
join(_streamId);
}
_ping = Timer.periodic(Duration(seconds: 5), (timer) {
final ping_msg = {'command': 'ping'};
_sendAntMedia(ping_msg);
});
};
_socket?.onMessage = (message) {
print('Received data: $message');
final decoder = JsonDecoder();
onMessage(decoder.convert(message));
};
_socket?.onClose = (int code, String reason) {
print('Closed by server [$code => $reason]!');
_ping?.cancel();
onStateChange(HelperState.ConnectionClosed);
};
await _socket?.connect();
}
// Create a local stream using camera or display
Future<MediaStream> createStream(media, bool userScreen) async {
final mediaConstraints = {
'audio': true,
'video': {
'mandatory': {
'minWidth': '640',
'minHeight': '480',
'minFrameRate': '30',
},
'facingMode': 'user',
'optional': [],
},
};
final stream = userScreen
? await navigator.mediaDevices.getDisplayMedia(mediaConstraints)
: await navigator.mediaDevices.getUserMedia(mediaConstraints);
onLocalStream(stream);
return stream;
}
// Set local stream
void setStream(MediaStream? media) {
_localStream = media;
}
Future<RTCPeerConnection> _createPeerConnection(
String id,
String media,
bool userScreen,
) async {
if (_type == AntMediaType.Publish ||
_type == AntMediaType.Peer ||
_type == AntMediaType.Conference ||
_type == AntMediaType.Default) {
if (media != 'data' && _localStream == null) {
_localStream = await createStream(media, userScreen);
_remoteStreams.add(_localStream!);
}
}
final pc = await createPeerConnection(_config);
if (_type == AntMediaType.Publish ||
_type == AntMediaType.Peer ||
_type == AntMediaType.Default ||
(_type == AntMediaType.Conference &&
_type != AntMediaType.DataChannelOnly)) {
if (media != 'data' && _localStream != null) {
for (final track in _localStream!.getTracks()) {
final sender = await pc.addTrack(track, _localStream!);
_senders.add(sender);
}
}
}
pc.onIceCandidate = (candidate) {
final request = {
'command': 'takeCandidate',
'streamId': id,
'label': candidate.sdpMLineIndex,
'id': candidate.sdpMid,
'candidate': candidate.candidate,
};
_sendAntMedia(request);
};
pc.onIceConnectionState = (state) {
if (state == RTCIceConnectionState.RTCIceConnectionStateConnected &&
maxVideoBitrate != -1) {
setMaxBitrate(id, "video", maxVideoBitrate);
if (maxAudioBitrate != -1) {
setMaxBitrate(id, "audio", maxAudioBitrate);
}
}
};
pc.onTrack = (event) {
onupdateConferencePerson(event.streams[0]);
onAddRemoteStream(event.streams[0]);
};
pc.onRemoveTrack = (stream, track) {
onupdateConferencePerson(stream);
};
pc.onDataChannel = (channel) {
_addDataChannel(id, channel);
};
return pc;
}
void _addDataChannel(String id, RTCDataChannel channel) {
channel.onDataChannelState = (e) {};
channel.onMessage = (data) {
onDataChannelMessage(channel, data, true);
};
_dataChannel = channel;
onDataChannel(channel);
}
Future<void> _createDataChannel(
String id,
RTCPeerConnection pc, {
String label = 'fileTransfer',
}) async {
final dataChannelDict = RTCDataChannelInit();
final channel = await pc.createDataChannel(label, dataChannelDict);
_addDataChannel(id, channel);
}
Future<void> _createOfferAntMedia(
String id,
RTCPeerConnection pc,
String media,
) async {
try {
final s = await pc
.createOffer(DataChannelOnly ? _dc_constraints : _constraints);
await pc.setLocalDescription(s);
final request = {
'command': 'takeConfiguration',
'streamId': id,
'type': s.type,
'sdp': s.sdp,
};
_sendAntMedia(request);
} catch (e) {
print(e.toString());
}
}
Future<void> _createAnswerAntMedia(
String id,
RTCPeerConnection pc,
String media,
) async {
try {
final s = await pc
.createAnswer(DataChannelOnly ? _dc_constraints : _constraints);
await pc.setLocalDescription(s);
final request = {
'command': 'takeConfiguration',
'streamId': id,
'type': s.type,
'sdp': s.sdp,
};
_sendAntMedia(request);
} catch (e) {
print(e.toString());
}
}
// Send a request to the Ant Media Server using the websocket
void _sendAntMedia(Map<String, dynamic> request) {
_socket?.send(_encoder.convert(request));
}
// Close peer connection
void closePeerConnection(String streamId) {
print('bye: $streamId');
if (_mute) muteMic(false);
_localStream?.dispose();
_localStream = null;
final pc = _peerConnections.remove(streamId);
pc?.close();
_dataChannel?.close();
_senders.clear();
onStateChange(HelperState.CallStateBye);
}
// Register user push notification token to Ant Media Server
void registerPushNotificationToken(
String subscriberId,
String authToken,
String pushNotificationToken,
String tokenType,
) {
final request = {
'command': 'registerPushNotificationToken',
'subscriberId': subscriberId,
'token': authToken,
'pnsRegistrationToken': pushNotificationToken,
'pnsType': tokenType,
};
_sendAntMedia(request);
}
// Send push notification to subscribers
void sendPushNotification(
String subscriberId,
String authToken,
Map pushNotificationContent,
List subscriberIdsToNotify,
) {
final request = {
'command': 'sendPushNotification',
'subscriberId': subscriberId,
'token': authToken,
'pushNotificationContent': pushNotificationContent.toString(),
'subscriberIdsToNotify': subscriberIdsToNotify,
};
_sendAntMedia(request);
}
/// Called to start a new WebRTC stream. AMS responds with start message.
/// Parameters:
/// @param {string} streamId : unique id for the stream
/// @param {string=} [token] : required if any stream security (token control) enabled.
/// @param {string=} [subscriberId] : required if TOTP enabled.
/// @param {string=} [subscriberCode] : required if TOTP enabled.
/// @param {string=} [streamName] : required if you want to set a name for the stream
/// @param {string=} [mainTrack] : required if you want to start the stream as a subtrack for a main stream which has id of this parameter.
/// @param {string=} [metaData] : a free text information for the stream to AMS.
void publish(
String streamId,
String token,
String? subscriberId,
String? subscriberCode,
String? streamName,
String? mainTrack,
String? metaData,
) {
final request = {
'command': 'publish',
'streamId': streamId,
'token': token,
'subscriberId': subscriberId,
'subscriberCode': subscriberCode,
'streamName': streamName,
'mainTrack': mainTrack,
'video': !DataChannelOnly,
'audio': !DataChannelOnly,
'metaData': metaData,
};
_sendAntMedia(request);
}
// Force stream into a specific quality
void forceStreamQuality(String streamId, int resolution) {
final request = {
'command': 'forceStreamQuality',
'streamId': streamId,
'streamHeight': resolution,
};
print("Requesting new stream resolution $resolution");
_sendAntMedia(request);
}
// Join into a conference room as player
void join(String streamId) {
final request = {
'command': 'join',
'streamId': streamId,
'multiPeer': false,
'mode': 'play or both',
};
_sendAntMedia(request);
}
void _handleMainTrackBroadcastObject(Map<String, dynamic> broadcast) {
final participantIds = List<String>.from(broadcast['subTrackStreamIds']);
// Find and remove not available tracks
final currentTracks = allParticipants.keys;
for (final trackId in currentTracks) {
if (!participantIds.contains(trackId)) {
print("Stream removed: $trackId");
allParticipants.remove(trackId);
}
}
// Request broadcast object for new tracks
for (final pid in participantIds) {
if (allParticipants[pid] == null) {
_getBroadcastObject(pid);
}
}
}
void _handleSubTrackBroadcastObject(Map<String, dynamic> broadcast) {
allParticipants[broadcast['streamId']] = broadcast;
print("All participants: $allParticipants");
}
/// Called to start a playing session for a stream. AMS responds with start message.
/// Parameters:
/// @param {string} streamId : unique id for the stream that you want to play
/// @param {string=} token : required if any stream security (token control) enabled.
/// @param {string=} roomId : required if this stream is belonging to a room participant
/// @param {Array.<MediaStreamTrack>=} enableTracks : required if the stream is a main stream of multitrack playing.
/// @param {string=} subscriberId : required if TOTP enabled.
/// @param {string=} subscriberCode : required if TOTP enabled.
/// @param {string=} metaData : a free text information for the stream to AMS.
void play(
String streamId,
String? token,
String? roomId,
List<MediaStreamTrack> enableTracks,
String? subscriberId,
String? subscriberCode,
String? metaData,
) {
final request = {
'command': 'play',
'streamId': streamId,
'token': token,
'room': roomId,
'trackList': enableTracks,
'subscriberId': subscriberId,
'subscriberCode': subscriberCode,
'viewerInfo': metaData,
};
_sendAntMedia(request);
}
void _handleNotificationEvent(Map<String, dynamic> notificationEvent) {
print("Notification event: ${notificationEvent.toString()}");
final eventStreamId = notificationEvent['streamId'];
final eventType = notificationEvent['eventType'];
if (eventType == "CAM_TURNED_OFF" ||
eventType == "CAM_TURNED_ON" ||
eventType == "MIC_MUTED" ||
eventType == "MIC_UNMUTED") {
_getBroadcastObject(eventStreamId);
} else if (eventType == "TRACK_LIST_UPDATED") {
print("TRACK_LIST_UPDATED -> ${notificationEvent.toString()}");
_getBroadcastObject(_roomId);
}
}
// Send a text message using the WebRTC data channel
Future<void> sendMessage(RTCDataChannelMessage message) async {
if (_dataChannel != null) {
await _dataChannel?.send(message);
onDataChannelMessage(_dataChannel!, message, false);
}
}
void _getBroadcastObject(String streamId) {
final request = {
'command': 'getBroadcastObject',
'streamId': streamId,
};
_sendAntMedia(request);
}
void setMaxVideoBitrate(int videoBitrateInKbps) {
maxVideoBitrate = videoBitrateInKbps;
}
void setMaxAudioBitrate(int audioBitrateInKbps) {
maxAudioBitrate = audioBitrateInKbps;
}
}