Add local capturer on mac

webrtc/examples/objc/AppRTCDemo/mac/APPRTCViewController.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 "APPRTCViewController.h"
 
 #import <AVFoundation/AVFoundation.h>
 
 #import "WebRTC/RTCNSGLVideoView.h"
 #import "WebRTC/RTCVideoTrack.h"
 
 #import "ARDAppClient.h"
 
 static NSUInteger const kContentWidth = 1280;
 static NSUInteger const kContentHeight = 720;
 static NSUInteger const kRoomFieldWidth = 80;
 static NSUInteger const kLogViewHeight = 280;
+static NSUInteger const kPreviewWidth = 490;
 
 @class APPRTCMainView;
 @protocol APPRTCMainViewDelegate
 
 - (void)appRTCMainView:(APPRTCMainView*)mainView
         didEnterRoomId:(NSString*)roomId;
 
 @end
 
 @interface APPRTCMainView : NSView
@@ skipping 33 matching lines @@
 }
 
 - (void)updateConstraints {
   NSParameterAssert(
       _roomField != nil && _scrollView != nil && _remoteVideoView != nil);
   [self removeConstraints:[self constraints]];
   NSDictionary* viewsDictionary =
       NSDictionaryOfVariableBindings(_roomLabel,
                                      _roomField,
                                      _scrollView,
-                                     _remoteVideoView);
+                                     _remoteVideoView,
+                                     _localVideoView);
 
   NSSize remoteViewSize = [self remoteVideoViewSize];
   NSDictionary* metrics = @{
     @"kLogViewHeight" : @(kLogViewHeight),
+    @"kPreviewWidth" : @(kPreviewWidth),
     @"kRoomFieldWidth" : @(kRoomFieldWidth),
     @"remoteViewWidth" : @(remoteViewSize.width),
     @"remoteViewHeight" : @(remoteViewSize.height),
+    @"localViewHeight" : @(remoteViewSize.height),
+    @"scrollViewWidth" : @(kContentWidth - kPreviewWidth),
   };
   // Declare this separately to avoid compiler warning about splitting string
   // within an NSArray expression.
   NSString* verticalConstraint =
       @"V:|-[_roomLabel]-[_roomField]-[_scrollView(kLogViewHeight)]"
        "-[_remoteVideoView(remoteViewHeight)]-|";
   NSArray* constraintFormats = @[
       verticalConstraint,
+      @"V:[_localVideoView]-[_remoteVideoView]",
+      @"V:[_localVideoView(kLogViewHeight)]",
       @"|-[_roomLabel]",
       @"|-[_roomField(kRoomFieldWidth)]",
-      @"|-[_scrollView(remoteViewWidth)]-|",
+      @"|-[_scrollView(scrollViewWidth)]",
+      @"[_scrollView]-[_localVideoView]",
       @"|-[_remoteVideoView(remoteViewWidth)]-|",
+      @"[_localVideoView(kPreviewWidth)]-|",
   ];
   for (NSString* constraintFormat in constraintFormats) {
     NSArray* constraints =
         [NSLayoutConstraint constraintsWithVisualFormat:constraintFormat
                                                 options:0
                                                 metrics:metrics
                                                   views:viewsDictionary];
     for (NSLayoutConstraint* constraint in constraints) {
       [self addConstraint:constraint];
     }
@@ skipping 76 matching lines @@
     0
   };
   NSOpenGLPixelFormat* pixelFormat =
       [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
   _remoteVideoView = [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect
                                                  pixelFormat:pixelFormat];
   [_remoteVideoView setTranslatesAutoresizingMaskIntoConstraints:NO];
   _remoteVideoView.delegate = self;
   [self addSubview:_remoteVideoView];
 
-  // TODO(tkchin): create local video view.
-  // https://code.google.com/p/webrtc/issues/detail?id=3417.
+  _localVideoView = [[RTCNSGLVideoView alloc] initWithFrame:NSZeroRect
+                                                 pixelFormat:pixelFormat];
+  [_localVideoView setTranslatesAutoresizingMaskIntoConstraints:NO];
+  _localVideoView.delegate = self;
+  [self addSubview:_localVideoView];
 }
 
 - (NSSize)remoteVideoViewSize {
-  if (_remoteVideoSize.width > 0 && _remoteVideoSize.height > 0) {
-    return _remoteVideoSize;
-  } else {
-    return NSMakeSize(kContentWidth, kContentHeight);
-  }
-}
-
-- (NSSize)localVideoViewSize {
-  return NSZeroSize;
+  NSInteger width = MAX(_remoteVideoSize.width, kContentWidth);
+  NSInteger height = (width/16) * 9;
+  return NSMakeSize(width, height);
 }
 
 @end
 
 @interface APPRTCViewController ()
     <ARDAppClientDelegate, APPRTCMainViewDelegate>
 @property(nonatomic, readonly) APPRTCMainView* mainView;
 @end
 
 @implementation APPRTCViewController {
@@ skipping 36 matching lines @@
   }
 }
 
 - (void)appClient:(ARDAppClient *)client
     didChangeConnectionState:(RTCIceConnectionState)state {
 }
 
 - (void)appClient:(ARDAppClient *)client
     didReceiveLocalVideoTrack:(RTCVideoTrack *)localVideoTrack {
   _localVideoTrack = localVideoTrack;
+  [_localVideoTrack addRenderer:self.mainView.localVideoView];
 }
 
 - (void)appClient:(ARDAppClient *)client
     didReceiveRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack {
   _remoteVideoTrack = remoteVideoTrack;
   [_remoteVideoTrack addRenderer:self.mainView.remoteVideoView];
 }
 
 - (void)appClient:(ARDAppClient *)client
          didError:(NSError *)error {
@@ skipping 26 matching lines @@
 }
 
 - (void)showAlertWithMessage:(NSString*)message {
   NSAlert* alert = [[NSAlert alloc] init];
   [alert setMessageText:message];
   [alert runModal];
 }
 
 - (void)resetUI {
   [_remoteVideoTrack removeRenderer:self.mainView.remoteVideoView];
+  [_localVideoTrack removeRenderer:self.mainView.localVideoView];
   _remoteVideoTrack = nil;
+  _localVideoTrack = nil;
   [self.mainView.remoteVideoView renderFrame:nil];
+  [self.mainView.localVideoView renderFrame:nil];
 }
 
 - (void)disconnect {
   [self resetUI];
   [_client disconnect];
 }
 
 @end