Add setting to AppRTCMobile for iOS, that can change capture resolution.

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 83 matching lines @@
 
 - (void)timerDidFire:(NSTimer *)timer {
   _timerHandler();
 }
 
 @end
 
 @implementation ARDAppClient {
   RTCFileLogger *_fileLogger;
   ARDTimerProxy *_statsTimer;
+  RTCMediaConstraints *_cameraConstraints;
 }
 
 @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 200 matching lines @@
   [_factory stopAecDump];
   [_peerConnection stopRtcEventLog];
 #endif
   _peerConnection = nil;
   self.state = kARDAppClientStateDisconnected;
 #if defined(WEBRTC_IOS)
   RTCStopInternalCapture();
 #endif
 }
 
+- (void)setCameraConstraints:(RTCMediaConstraints *)mediaConstraints {
+  _cameraConstraints = mediaConstraints;
+}
+
 #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 354 matching lines @@
   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.
 #if !TARGET_IPHONE_SIMULATOR
   if (!_isAudioOnly) {
-    RTCMediaConstraints *mediaConstraints =
-        [self defaultMediaStreamConstraints];
+    RTCMediaConstraints *cameraConstraints =
+        [self cameraConstraints];
     RTCAVFoundationVideoSource *source =
-        [_factory avFoundationVideoSourceWithConstraints:mediaConstraints];
+        [_factory avFoundationVideoSourceWithConstraints:cameraConstraints];
     localVideoTrack =
         [_factory videoTrackWithSource:source
                                trackId:kARDVideoTrackId];
   }
 #endif
   return localVideoTrack;
 }
 
 #pragma mark - Collider methods
 
@@ skipping 18 matching lines @@
     [_loopbackChannel registerForRoomId:_roomId clientId:@"LOOPBACK_CLIENT_ID"];
   }
 }
 
 #pragma mark - Defaults
 
  - (RTCMediaConstraints *)defaultMediaAudioConstraints {
    NSString *valueLevelControl = _shouldUseLevelControl ?
        kRTCMediaConstraintsValueTrue : kRTCMediaConstraintsValueFalse;
    NSDictionary *mandatoryConstraints = @{ kRTCMediaConstraintsLevelControl : valueLevelControl };
-   RTCMediaConstraints* constraints =
-       [[RTCMediaConstraints alloc]  initWithMandatoryConstraints:mandatoryConstraints
-                                              optionalConstraints:nil];
+   RTCMediaConstraints *constraints =
+       [[RTCMediaConstraints alloc] initWithMandatoryConstraints:mandatoryConstraints
+                                             optionalConstraints:nil];
    return constraints;
 }
 
-- (RTCMediaConstraints *)defaultMediaStreamConstraints {
-  RTCMediaConstraints* constraints =
-      [[RTCMediaConstraints alloc]
-          initWithMandatoryConstraints:nil
-                   optionalConstraints:nil];
-  return constraints;
+- (RTCMediaConstraints *)cameraConstraints {
+  return _cameraConstraints;
 }
 
 - (RTCMediaConstraints *)defaultAnswerConstraints {
   return [self defaultOfferConstraints];
 }
 
 - (RTCMediaConstraints *)defaultOfferConstraints {
   NSDictionary *mandatoryConstraints = @{
     @"OfferToReceiveAudio" : @"true",
     @"OfferToReceiveVideo" : @"true"
@@ skipping 75 matching lines @@
                                          code:kARDAppClientErrorInvalidRoom
                                      userInfo:@{
         NSLocalizedDescriptionKey: @"Invalid room.",
       }];
       break;
   }
   return error;
 }
 
 @end