Fix lock behavior on RTCAudioSession.

webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallView.m

 /*
  *  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 "ARDVideoCallView.h"
 
 #import <AVFoundation/AVFoundation.h>
 #import "UIImage+ARDUtilities.h"
 
 static CGFloat const kButtonPadding = 16;
 static CGFloat const kButtonSize = 48;
 static CGFloat const kLocalVideoViewSize = 120;
 static CGFloat const kLocalVideoViewPadding = 8;
 static CGFloat const kStatusBarHeight = 20;
 
 @interface ARDVideoCallView () <RTCEAGLVideoViewDelegate>
 @end
 
 @implementation ARDVideoCallView {
+  UIButton *_routeChangeButton;
   UIButton *_cameraSwitchButton;
   UIButton *_hangupButton;
   CGSize _remoteVideoSize;
   BOOL _useRearCamera;
 }
 
 @synthesize statusLabel = _statusLabel;
 @synthesize localVideoView = _localVideoView;
 @synthesize remoteVideoView = _remoteVideoView;
 @synthesize statsView = _statsView;
 @synthesize delegate = _delegate;
 
 - (instancetype)initWithFrame:(CGRect)frame {
   if (self = [super initWithFrame:frame]) {
     _remoteVideoView = [[RTCEAGLVideoView alloc] initWithFrame:CGRectZero];
     _remoteVideoView.delegate = self;
     [self addSubview:_remoteVideoView];
 
     _localVideoView = [[RTCCameraPreviewView alloc] initWithFrame:CGRectZero];
     [self addSubview:_localVideoView];
 
     _statsView = [[ARDStatsView alloc] initWithFrame:CGRectZero];
     _statsView.hidden = YES;
     [self addSubview:_statsView];
 
+    _routeChangeButton = [UIButton buttonWithType:UIButtonTypeCustom];
+    _routeChangeButton.backgroundColor = [UIColor whiteColor];
+    _routeChangeButton.layer.cornerRadius = kButtonSize / 2;
+    _routeChangeButton.layer.masksToBounds = YES;
+    UIImage *image = [UIImage imageNamed:@"ic_surround_sound_black_24dp.png"];
+    [_routeChangeButton setImage:image forState:UIControlStateNormal];
+    [_routeChangeButton addTarget:self
+                           action:@selector(onRouteChange:)
+                 forControlEvents:UIControlEventTouchUpInside];
+    [self addSubview:_routeChangeButton];
+
     // TODO(tkchin): don't display this if we can't actually do camera switch.
     _cameraSwitchButton = [UIButton buttonWithType:UIButtonTypeCustom];
     _cameraSwitchButton.backgroundColor = [UIColor whiteColor];
     _cameraSwitchButton.layer.cornerRadius = kButtonSize / 2;
     _cameraSwitchButton.layer.masksToBounds = YES;
-    UIImage *image = [UIImage imageNamed:@"ic_switch_video_black_24dp.png"];
+    image = [UIImage imageNamed:@"ic_switch_video_black_24dp.png"];
     [_cameraSwitchButton setImage:image forState:UIControlStateNormal];
     [_cameraSwitchButton addTarget:self
                       action:@selector(onCameraSwitch:)
             forControlEvents:UIControlEventTouchUpInside];
     [self addSubview:_cameraSwitchButton];
 
     _hangupButton = [UIButton buttonWithType:UIButtonTypeCustom];
     _hangupButton.backgroundColor = [UIColor redColor];
     _hangupButton.layer.cornerRadius = kButtonSize / 2;
     _hangupButton.layer.masksToBounds = YES;
@@ skipping 66 matching lines @@
                      kButtonSize,
                  kButtonSize,
                  kButtonSize);
 
   // Place button to the right of hangup button.
   CGRect cameraSwitchFrame = _hangupButton.frame;
   cameraSwitchFrame.origin.x =
       CGRectGetMaxX(cameraSwitchFrame) + kButtonPadding;
   _cameraSwitchButton.frame = cameraSwitchFrame;
 
+  // Place route button to the right of camera button.
+  CGRect routeChangeFrame = _cameraSwitchButton.frame;
+  routeChangeFrame.origin.x =
+      CGRectGetMaxX(routeChangeFrame) + kButtonPadding;
+  _routeChangeButton.frame = routeChangeFrame;
+
   [_statusLabel sizeToFit];
   _statusLabel.center =
       CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
 }
 
 #pragma mark - RTCEAGLVideoViewDelegate
 
 - (void)videoView:(RTCEAGLVideoView*)videoView didChangeVideoSize:(CGSize)size {
  if (videoView == _remoteVideoView) {
     _remoteVideoSize = size;
   }
   [self setNeedsLayout];
 }
 
 #pragma mark - Private
 
 - (void)onCameraSwitch:(id)sender {
   [_delegate videoCallViewDidSwitchCamera:self];
 }
 
+- (void)onRouteChange:(id)sender {
+  [_delegate videoCallViewDidChangeRoute:self];
+}
+
 - (void)onHangup:(id)sender {
   [_delegate videoCallViewDidHangup:self];
 }
 
 - (void)didTripleTap:(UITapGestureRecognizer *)recognizer {
   [_delegate videoCallViewDidEnableStats:self];
 }
 
 @end