Added the API to create an RTCRtpSender to the Objective C wrapper.

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.
  */
 
 #import "ARDAppClient+Internal.h"
 
 #if defined(WEBRTC_IOS)
 #import "WebRTC/RTCAVFoundationVideoSource.h"
 #import "WebRTC/RTCTracing.h"
 #endif
 #import "WebRTC/RTCAudioTrack.h"
 #import "WebRTC/RTCConfiguration.h"
 #import "WebRTC/RTCFileLogger.h"
 #import "WebRTC/RTCIceServer.h"
 #import "WebRTC/RTCLogging.h"
 #import "WebRTC/RTCMediaConstraints.h"
 #import "WebRTC/RTCMediaStream.h"
 #import "WebRTC/RTCPeerConnectionFactory.h"
+#import "WebRTC/RTCRtpSender.h"
 
 #import "ARDAppEngineClient.h"
 #import "ARDCEODTURNClient.h"
 #import "ARDJoinResponse.h"
 #import "ARDMessageResponse.h"
 #import "ARDSDPUtils.h"
 #import "ARDSignalingMessage.h"
 #import "ARDUtilities.h"
 #import "ARDWebSocketChannel.h"
 #import "RTCIceCandidate+JSON.h"
 #import "RTCSessionDescription+JSON.h"
 
 static NSString * const kARDDefaultSTUNServerUrl =
     @"stun:stun.l.google.com:19302";
 // TODO(tkchin): figure out a better username for CEOD statistics.
 static NSString * const kARDTurnRequestUrl =
     @"https://computeengineondemand.appspot.com"
     @"/turn?username=iapprtc&key=4080218913";
 
 static NSString * const kARDAppClientErrorDomain = @"ARDAppClient";
 static NSInteger const kARDAppClientErrorUnknown = -1;
 static NSInteger const kARDAppClientErrorRoomFull = -2;
 static NSInteger const kARDAppClientErrorCreateSDP = -3;
 static NSInteger const kARDAppClientErrorSetSDP = -4;
 static NSInteger const kARDAppClientErrorInvalidClient = -5;
 static NSInteger const kARDAppClientErrorInvalidRoom = -6;
+static NSString * const kARDMediaTypeAudio = @"audio";
+static NSString * const kARDMediaTypeVideo = @"video";
+static NSString * const kARDMediaStreamId = @"ARDAMS";
+static NSString * const kARDAudioTrackId = @"ARDAMSa0";
+static NSString * const kARDVideoTrackId = @"ARDAMSv0";
 
 // TODO(tkchin): Remove guard once rtc_sdk_common_objc compiles on Mac.
 #if defined(WEBRTC_IOS)
 // TODO(tkchin): Add this as a UI option.
 static BOOL const kARDAppClientEnableTracing = NO;
 #endif
 
 // We need a proxy to NSTimer because it causes a strong retain cycle. When
 // using the proxy, |invalidate| must be called before it properly deallocs.
 @interface ARDTimerProxy : NSObject
@@ skipping 437 matching lines @@
   }
   self.state = kARDAppClientStateConnected;
 
   // Create peer connection.
   RTCMediaConstraints *constraints = [self defaultPeerConnectionConstraints];
   RTCConfiguration *config = [[RTCConfiguration alloc] init];
   config.iceServers = _iceServers;
   _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];
+  // Create AV senders.
+  [self createAudioSender];
+  [self createVideoSender];
   if (_isInitiator) {
     // Send offer.
     __weak ARDAppClient *weakSelf = self;
     [_peerConnection offerForConstraints:[self defaultOfferConstraints]
                        completionHandler:^(RTCSessionDescription *sdp,
                                            NSError *error) {
       ARDAppClient *strongSelf = weakSelf;
       [strongSelf peerConnection:strongSelf.peerConnection
           didCreateSessionDescription:sdp
                                 error:error];
@@ skipping 78 matching lines @@
       if (messageError) {
         [strongSelf.delegate appClient:strongSelf didError:messageError];
         return;
       }
     }];
   } else {
     [_channel sendMessage:message];
   }
 }
 
-- (RTCMediaStream *)createLocalMediaStream {
-  RTCMediaStream *localStream = [_factory mediaStreamWithStreamId:@"ARDAMS"];
-  RTCVideoTrack *localVideoTrack = [self createLocalVideoTrack];
-  if (localVideoTrack) {
-    [localStream addVideoTrack:localVideoTrack];
-    [_delegate appClient:self didReceiveLocalVideoTrack:localVideoTrack];
+- (RTCRtpSender *)createVideoSender {
+  RTCRtpSender *sender = [_peerConnection senderWithKind:kARDMediaTypeVideo
+                                                streamId:kARDMediaStreamId];
+  RTCVideoTrack *track = [self createLocalVideoTrack];
+  if (track) {
+    sender.track = track;
+    [_delegate appClient:self didReceiveLocalVideoTrack:track];
   }
-  RTCAudioTrack *localAudioTrack =
-      [_factory audioTrackWithTrackId:@"ARDAMSa0"];
-  [localStream addAudioTrack:localAudioTrack];
-  return localStream;
+  return sender;
+}
+
+- (RTCRtpSender *)createAudioSender {
+  RTCRtpSender *sender = [_peerConnection senderWithKind:kARDMediaTypeAudio
+                                                streamId:kARDMediaStreamId];
+  RTCAudioTrack *track = [_factory audioTrackWithTrackId:kARDAudioTrackId];
+  sender.track = track;
+  return sender;
 }
 
 - (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 =
         [_factory avFoundationVideoSourceWithConstraints:mediaConstraints];
     localVideoTrack =
         [_factory videoTrackWithSource:source
-                               trackId:@"ARDAMSv0"];
+                               trackId:kARDVideoTrackId];
   }
 #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