Refactor some ObjC API init methods.

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 484 matching lines @@
 - (void)startSignalingIfReady {
   if (!_isTurnComplete || !self.hasJoinedRoomServerRoom) {
     return;
   }
   self.state = kARDAppClientStateConnected;
 
   // Create peer connection.
   RTCMediaConstraints *constraints = [self defaultPeerConnectionConstraints];
   RTCConfiguration *config = [[RTCConfiguration alloc] init];
   config.iceServers = _iceServers;
-  _peerConnection = [[RTCPeerConnection alloc] initWithFactory:_factory
-                                                 configuration:config
-                                                   constraints:constraints
-                                                      delegate:self];
+  _peerConnection = [_factory peerConnectionWithConfiguration:config
+                                                  constraints:constraints
+                                                     delegate:self];
   // Create AV media stream and add it to the peer connection.
   RTCMediaStream *localStream = [self createLocalMediaStream];
   [_peerConnection addStream:localStream];
   if (_isInitiator) {
     // Send offer.
     __weak ARDAppClient *weakSelf = self;
     [_peerConnection offerForConstraints:[self defaultOfferConstraints]
                        completionHandler:^(RTCSessionDescription *sdp,
                                            NSError *error) {
       ARDAppClient *strongSelf = weakSelf;
@@ skipping 82 matching lines @@
         [strongSelf.delegate appClient:strongSelf didError:messageError];
         return;
       }
     }];
   } else {
     [_channel sendMessage:message];
   }
 }
 
 - (RTCMediaStream *)createLocalMediaStream {
-  RTCMediaStream *localStream =
-      [[RTCMediaStream alloc] initWithFactory:_factory streamId:@"ARDAMS"];
+  RTCMediaStream *localStream = [_factory mediaStreamWithStreamId:@"ARDAMS"];
   RTCVideoTrack *localVideoTrack = [self createLocalVideoTrack];
   if (localVideoTrack) {
     [localStream addVideoTrack:localVideoTrack];
     [_delegate appClient:self didReceiveLocalVideoTrack:localVideoTrack];
   }
   RTCAudioTrack *localAudioTrack =
-        [[RTCAudioTrack alloc] initWithFactory:_factory
-                                       trackId:@"ARDAMSa0"];
+      [_factory audioTrackWithTrackId:@"ARDAMSa0"];
   [localStream addAudioTrack:localAudioTrack];
   return localStream;
 }
 
 - (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
   if (!_isAudioOnly) {
     RTCMediaConstraints *mediaConstraints =
         [self defaultMediaStreamConstraints];
     RTCAVFoundationVideoSource *source =
-        [[RTCAVFoundationVideoSource alloc] initWithFactory:_factory
-                                                constraints:mediaConstraints];
+        [_factory avFoundationVideoSourceWithConstraints:mediaConstraints];
     localVideoTrack =
-        [[RTCVideoTrack alloc] initWithFactory:_factory
-                                        source:source
-                                       trackId:@"ARDAMSv0"];
+        [_factory videoTrackWithSource:source
+                               trackId:@"ARDAMSv0"];
   }
 #endif
   return localVideoTrack;
 }
 
 #pragma mark - Collider methods
 
 - (void)registerWithColliderIfReady {
   if (!self.hasJoinedRoomServerRoom) {
     return;
@@ skipping 112 matching lines @@
                                          code:kARDAppClientErrorInvalidRoom
                                      userInfo:@{
         NSLocalizedDescriptionKey: @"Invalid room.",
       }];
       break;
   }
   return error;
 }
 
 @end