Loopback mode for AppRTCDemo on iOS.

webrtc/examples/objc/AppRTCDemo/ARDAppClient.m

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 81 matching lines @@
 @implementation ARDAppClient {
   RTCFileLogger *_fileLogger;
   ARDTimerProxy *_statsTimer;
 }
 
 @synthesize shouldGetStats = _shouldGetStats;
 @synthesize state = _state;
 @synthesize delegate = _delegate;
 @synthesize roomServerClient = _roomServerClient;
 @synthesize channel = _channel;
+@synthesize loopbackChannel = _loopbackChannel;
 @synthesize turnClient = _turnClient;
 @synthesize peerConnection = _peerConnection;
 @synthesize factory = _factory;
 @synthesize messageQueue = _messageQueue;
 @synthesize isTurnComplete = _isTurnComplete;
 @synthesize hasReceivedSdp  = _hasReceivedSdp;
 @synthesize roomId = _roomId;
 @synthesize clientId = _clientId;
 @synthesize isInitiator = _isInitiator;
 @synthesize iceServers = _iceServers;
 @synthesize webSocketURL = _websocketURL;
 @synthesize webSocketRestURL = _websocketRestURL;
 @synthesize defaultPeerConnectionConstraints =
     _defaultPeerConnectionConstraints;
+@synthesize isLoopback = _isLoopback;
+@synthesize isAudioOnly = _isAudioOnly;
 
 - (instancetype)init {
   if (self = [super init]) {
     _roomServerClient = [[ARDAppEngineClient alloc] init];
     NSURL *turnRequestURL = [NSURL URLWithString:kARDTurnRequestUrl];
     _turnClient = [[ARDCEODTURNClient alloc] initWithURL:turnRequestURL];
     [self configure];
   }
   return self;
 }
@@ skipping 65 matching lines @@
 
 - (void)setState:(ARDAppClientState)state {
   if (_state == state) {
     return;
   }
   _state = state;
   [_delegate appClient:self didChangeState:_state];
 }
 
 - (void)connectToRoomWithId:(NSString *)roomId
+                 isLoopback:(BOOL)isLoopback
+                isAudioOnly:(BOOL)isAudioOnly
                     options:(NSDictionary *)options {
   NSParameterAssert(roomId.length);
   NSParameterAssert(_state == kARDAppClientStateDisconnected);
+  _isLoopback = isLoopback;
+  _isAudioOnly = isAudioOnly;
   self.state = kARDAppClientStateConnecting;
 
   // Request TURN.
   __weak ARDAppClient *weakSelf = self;
   [_turnClient requestServersWithCompletionHandler:^(NSArray *turnServers,
                                                      NSError *error) {
     if (error) {
       RTCLogError("Error retrieving TURN servers: %@",
                   error.localizedDescription);
     }
     ARDAppClient *strongSelf = weakSelf;
     [strongSelf.iceServers addObjectsFromArray:turnServers];
     strongSelf.isTurnComplete = YES;
     [strongSelf startSignalingIfReady];
   }];
 
   // Join room on room server.
   [_roomServerClient joinRoomWithRoomId:roomId
+                             isLoopback:isLoopback
       completionHandler:^(ARDJoinResponse *response, NSError *error) {
     ARDAppClient *strongSelf = weakSelf;
     if (error) {
       [strongSelf.delegate appClient:strongSelf didError:error];
       return;
     }
     NSError *joinError =
         [[strongSelf class] errorForJoinResultType:response.result];
     if (joinError) {
       RTCLogError(@"Failed to join room:%@ on room server.", roomId);
@@ skipping 340 matching lines @@
 }
 
 - (RTCVideoTrack *)createLocalVideoTrack {
   RTCVideoTrack* localVideoTrack = nil;
   // The iOS simulator doesn't provide any sort of camera capture
   // support or emulation (http://goo.gl/rHAnC1) so don't bother
   // trying to open a local stream.
   // TODO(tkchin): local video capture for OSX. See
   // https://code.google.com/p/webrtc/issues/detail?id=3417.
 #if !TARGET_IPHONE_SIMULATOR && TARGET_OS_IPHONE
-  RTCMediaConstraints *mediaConstraints = [self defaultMediaStreamConstraints];
-  RTCAVFoundationVideoSource *source =
-      [[RTCAVFoundationVideoSource alloc] initWithFactory:_factory
-                                              constraints:mediaConstraints];
-  localVideoTrack =
-      [[RTCVideoTrack alloc] initWithFactory:_factory
-                                      source:source
-                                     trackId:@"ARDAMSv0"];
+  if (!_isAudioOnly) {

[henrika_webrtc, 2015/09/14 08:31:20]

Not sure what type of logging support we have but it would be nice with a log
here stating that the video track is NULL but it is not an error.

[Chuck, 2015/09/28 16:26:40]

it doesn't look like we do much logging at all in AppRTCDemo. Might be a useful
thing to improve at some point.

+    RTCMediaConstraints *mediaConstraints =
+        [self defaultMediaStreamConstraints];
+    RTCAVFoundationVideoSource *source =
+        [[RTCAVFoundationVideoSource alloc] initWithFactory:_factory
+                                                constraints:mediaConstraints];
+    localVideoTrack =
+        [[RTCVideoTrack alloc] initWithFactory:_factory
+                                        source:source
+                                       trackId:@"ARDAMSv0"];
+  }
 #endif
   return localVideoTrack;
 }
 
 #pragma mark - Collider methods
 
 - (void)registerWithColliderIfReady {
   if (!self.hasJoinedRoomServerRoom) {
     return;
   }
   // Open WebSocket connection.
   if (!_channel) {
     _channel =
         [[ARDWebSocketChannel alloc] initWithURL:_websocketURL
                                          restURL:_websocketRestURL
                                         delegate:self];
+    if (_isLoopback) {
+      _loopbackChannel =
+          [[ARDLoopbackWebSocketChannel alloc] initWithURL:_websocketURL
+                                                   restURL:_websocketRestURL];
+    }
   }
   [_channel registerForRoomId:_roomId clientId:_clientId];
+  if (_isLoopback) {
+    [_loopbackChannel registerForRoomId:_roomId clientId:@"LOOPBACk_CLIENT_ID"];
+  }
 }
 
 #pragma mark - Defaults
 
 - (RTCMediaConstraints *)defaultMediaStreamConstraints {
   RTCMediaConstraints* constraints =
       [[RTCMediaConstraints alloc]
           initWithMandatoryConstraints:nil
                    optionalConstraints:nil];
   return constraints;
@@ skipping 12 matching lines @@
       [[RTCMediaConstraints alloc]
           initWithMandatoryConstraints:mandatoryConstraints
                    optionalConstraints:nil];
   return constraints;
 }
 
 - (RTCMediaConstraints *)defaultPeerConnectionConstraints {
   if (_defaultPeerConnectionConstraints) {
     return _defaultPeerConnectionConstraints;
   }
+  NSString *value = _isLoopback ? @"false" : @"true";
   NSArray *optionalConstraints = @[
-      [[RTCPair alloc] initWithKey:@"DtlsSrtpKeyAgreement" value:@"true"]
+      [[RTCPair alloc] initWithKey:@"DtlsSrtpKeyAgreement" value:value]
   ];
   RTCMediaConstraints* constraints =
       [[RTCMediaConstraints alloc]
           initWithMandatoryConstraints:nil
                    optionalConstraints:optionalConstraints];
   return constraints;
 }
 
 - (RTCICEServer *)defaultSTUNServer {
   NSURL *defaultSTUNServerURL = [NSURL URLWithString:kARDDefaultSTUNServerUrl];
@@ skipping 53 matching lines @@
                                          code:kARDAppClientErrorInvalidRoom
                                      userInfo:@{
         NSLocalizedDescriptionKey: @"Invalid room.",
       }];
       break;
   }
   return error;
 }
 
 @end