Add new view that renders local video using AVCaptureLayerPreview.

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 *_cameraSwitchButton;
   UIButton *_hangupButton;
-  CGSize _localVideoSize;
   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];
 
-    // TODO(tkchin): replace this with a view that renders layer from
-    // AVCaptureSession.
-    _localVideoView = [[RTCEAGLVideoView alloc] initWithFrame:CGRectZero];
-    _localVideoView.delegate = self;
+    _localVideoView = [[RTCCameraPreviewView alloc] initWithFrame:CGRectZero];
     [self addSubview:_localVideoView];
 
     _statsView = [[ARDStatsView alloc] initWithFrame:CGRectZero];
     _statsView.hidden = YES;
     [self addSubview:_statsView];
 
     // 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;
@@ skipping 48 matching lines @@
     }
     remoteVideoFrame.size.height *= scale;
     remoteVideoFrame.size.width *= scale;
     _remoteVideoView.frame = remoteVideoFrame;
     _remoteVideoView.center =
         CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
   } else {
     _remoteVideoView.frame = bounds;
   }
 
-  if (_localVideoSize.width && _localVideoSize.height > 0) {
-    // Aspect fit local video view into a square box.
-    CGRect localVideoFrame =
-        CGRectMake(0, 0, kLocalVideoViewSize, kLocalVideoViewSize);
-    localVideoFrame =
-        AVMakeRectWithAspectRatioInsideRect(_localVideoSize, localVideoFrame);
-
-    // Place the view in the bottom right.
-    localVideoFrame.origin.x = CGRectGetMaxX(bounds)
-        - localVideoFrame.size.width - kLocalVideoViewPadding;
-    localVideoFrame.origin.y = CGRectGetMaxY(bounds)
-        - localVideoFrame.size.height - kLocalVideoViewPadding;
-    _localVideoView.frame = localVideoFrame;
-  } else {
-    _localVideoView.frame = bounds;
-  }
+  // Aspect fit local video view into a square box.
+  CGRect localVideoFrame =
+      CGRectMake(0, 0, kLocalVideoViewSize, kLocalVideoViewSize);
+  // Place the view in the bottom right.
+  localVideoFrame.origin.x = CGRectGetMaxX(bounds)
+      - localVideoFrame.size.width - kLocalVideoViewPadding;
+  localVideoFrame.origin.y = CGRectGetMaxY(bounds)
+      - localVideoFrame.size.height - kLocalVideoViewPadding;
+  _localVideoView.frame = localVideoFrame;
 
   // Place stats at the top.
   CGSize statsSize = [_statsView sizeThatFits:bounds.size];
   _statsView.frame = CGRectMake(CGRectGetMinX(bounds),
                                 CGRectGetMinY(bounds) + kStatusBarHeight,
                                 statsSize.width, statsSize.height);
 
   // Place hangup button in the bottom left.
   _hangupButton.frame =
       CGRectMake(CGRectGetMinX(bounds) + kButtonPadding,
                  CGRectGetMaxY(bounds) - kButtonPadding -
                      kButtonSize,
                  kButtonSize,
                  kButtonSize);
 
   // Place button to the right of hangup button.
   CGRect cameraSwitchFrame = _hangupButton.frame;
   cameraSwitchFrame.origin.x =
       CGRectGetMaxX(cameraSwitchFrame) + kButtonPadding;
   _cameraSwitchButton.frame = cameraSwitchFrame;
 
   [_statusLabel sizeToFit];
   _statusLabel.center =
       CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
 }
 
 #pragma mark - RTCEAGLVideoViewDelegate
 
 - (void)videoView:(RTCEAGLVideoView*)videoView didChangeVideoSize:(CGSize)size {
-  if (videoView == _localVideoView) {
-    _localVideoSize = size;
-    _localVideoView.hidden = CGSizeEqualToSize(CGSizeZero, _localVideoSize);
-  } else if (videoView == _remoteVideoView) {
+ if (videoView == _remoteVideoView) {
     _remoteVideoSize = size;
   }
   [self setNeedsLayout];
 }
 
 #pragma mark - Private
 
 - (void)onCameraSwitch:(id)sender {
   [_delegate videoCallViewDidSwitchCamera:self];
 }
 
 - (void)onHangup:(id)sender {
   [_delegate videoCallViewDidHangup:self];
 }
 
 - (void)didTripleTap:(UITapGestureRecognizer *)recognizer {
   [_delegate videoCallViewDidEnableStats:self];
 }
 
 @end