Refactor some ObjC API init methods.

webrtc/api/objc/RTCPeerConnectionFactory.mm

 /*
  *  Copyright 2015 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.
  */
 
 #import "RTCPeerConnectionFactory.h"
 
+#if defined(WEBRTC_IOS)
+#import "webrtc/api/objc/RTCAVFoundationVideoSource+Private.h"
+#endif
+#import "webrtc/api/objc/RTCAudioTrack+Private.h"
+#import "webrtc/api/objc/RTCMediaStream+Private.h"
+#import "webrtc/api/objc/RTCPeerConnection+Private.h"
 #import "webrtc/api/objc/RTCPeerConnectionFactory+Private.h"
+#import "webrtc/api/objc/RTCVideoSource+Private.h"
+#import "webrtc/api/objc/RTCVideoTrack+Private.h"
+#import "webrtc/base/objc/NSString+StdString.h"
 
 @implementation RTCPeerConnectionFactory {
   rtc::scoped_ptr<rtc::Thread> _signalingThread;
   rtc::scoped_ptr<rtc::Thread> _workerThread;
 }
 
 @synthesize nativeFactory = _nativeFactory;
 
 - (instancetype)init {
   if ((self = [super init])) {
     _signalingThread.reset(new rtc::Thread());
     BOOL result = _signalingThread->Start();
     NSAssert(result, @"Failed to start signaling thread.");
     _workerThread.reset(new rtc::Thread());
     result = _workerThread->Start();
     NSAssert(result, @"Failed to start worker thread.");
 
     _nativeFactory = webrtc::CreatePeerConnectionFactory(
         _workerThread.get(), _signalingThread.get(), nullptr, nullptr, nullptr);
     NSAssert(_nativeFactory, @"Failed to initialize PeerConnectionFactory!");
   }
   return self;
 }
 
+#if defined(WEBRTC_IOS)
+- (RTCAVFoundationVideoSource *)avFoundationVideoSourceWithConstraints:
+    (nullable RTCMediaConstraints *)constraints {
+  return [[RTCAVFoundationVideoSource alloc] initWithFactory:self
+                                                 constraints:constraints];
+}
+#endif
+
+- (RTCAudioTrack *)audioTrackWithTrackId:(NSString *)trackId {
+  return [[RTCAudioTrack alloc] initWithFactory:self
+                                        trackId:trackId];
+}
+
+- (RTCVideoTrack *)videoTrackWithSource:(RTCVideoSource *)source
+                                trackId:(NSString *)trackId {
+  return [[RTCVideoTrack alloc] initWithFactory:self
+                                         source:source
+                                        trackId:trackId];
+}
+
+- (RTCMediaStream *)mediaStreamWithStreamId:(NSString *)streamId {
+  return [[RTCMediaStream alloc] initWithFactory:self
+                                        streamId:streamId];
+}
+
+- (RTCPeerConnection *)peerConnectionWithConfiguration:
+    (RTCConfiguration *)configuration
+                                           constraints:
+    (RTCMediaConstraints *)constraints
+                                              delegate:
+    (nullable id<RTCPeerConnectionDelegate>)delegate {
+  return [[RTCPeerConnection alloc] initWithFactory:self
+                                      configuration:configuration
+                                        constraints:constraints
+                                           delegate:delegate];
+}
+
 @end