Expose bit rate property in ARDAppClient and set max bitrate for video RTCRtcSender.

webrtc/examples/objc/AppRTCMobile/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 84 matching lines @@
 - (void)timerDidFire:(NSTimer *)timer {
   _timerHandler();
 }
 
 @end
 
 @implementation ARDAppClient {
   RTCFileLogger *_fileLogger;
   ARDTimerProxy *_statsTimer;
   RTCMediaConstraints *_cameraConstraints;
+  NSNumber *_maxBitrate;
 }
 
 @synthesize shouldGetStats = _shouldGetStats;
 @synthesize state = _state;
 @synthesize delegate = _delegate;
 @synthesize roomServerClient = _roomServerClient;
 @synthesize channel = _channel;
 @synthesize loopbackChannel = _loopbackChannel;
 @synthesize turnClient = _turnClient;
 @synthesize peerConnection = _peerConnection;
@@ skipping 204 matching lines @@
   self.state = kARDAppClientStateDisconnected;
 #if defined(WEBRTC_IOS)
   RTCStopInternalCapture();
 #endif
 }
 
 - (void)setCameraConstraints:(RTCMediaConstraints *)mediaConstraints {
   _cameraConstraints = mediaConstraints;
 }
 
+- (void)setMaxBitrate:(NSNumber *)maxBitrate {
+  _maxBitrate = maxBitrate;
+}
+
 #pragma mark - ARDSignalingChannelDelegate
 
 - (void)channel:(id<ARDSignalingChannel>)channel
     didReceiveMessage:(ARDSignalingMessage *)message {
   switch (message.type) {
     case kARDSignalingMessageTypeOffer:
     case kARDSignalingMessageTypeAnswer:
       // Offers and answers must be processed before any other message, so we
       // place them at the front of the queue.
       _hasReceivedSdp = YES;
@@ skipping 327 matching lines @@
     }];
   } else {
     [_channel sendMessage:message];
   }
 }
 
 - (RTCRtpSender *)createVideoSender {
   RTCRtpSender *sender =
       [_peerConnection senderWithKind:kRTCMediaStreamTrackKindVideo
                              streamId:kARDMediaStreamId];
+
+  [self setMaxBitrate:_maxBitrate forVideoSender:sender];
+
   RTCVideoTrack *track = [self createLocalVideoTrack];
   if (track) {
     sender.track = track;
     [_delegate appClient:self didReceiveLocalVideoTrack:track];
   }
   return sender;
 }
 
+- (void)setMaxBitrate:(NSNumber *)maxBitrate forVideoSender:(RTCRtpSender *)sender {
+  for (RTCRtpEncodingParameters *encoding in sender.parameters.encodings) {
+    encoding.maxBitrateBps = maxBitrate;
+  }
+}
+
 - (RTCRtpSender *)createAudioSender {
   RTCMediaConstraints *constraints = [self defaultMediaAudioConstraints];
   RTCAudioSource *source = [_factory audioSourceWithConstraints:constraints];
   RTCAudioTrack *track = [_factory audioTrackWithSource:source
                                                 trackId:kARDAudioTrackId];
   RTCRtpSender *sender =
       [_peerConnection senderWithKind:kRTCMediaStreamTrackKindAudio
                              streamId:kARDMediaStreamId];
   sender.track = track;
   return sender;
@@ skipping 144 matching lines @@
                                          code:kARDAppClientErrorInvalidRoom
                                      userInfo:@{
         NSLocalizedDescriptionKey: @"Invalid room.",
       }];
       break;
   }
   return error;
 }
 
 @end