Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 587 insertions, 0 deletions

diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/NADAppDelegate.h b/third_party/libwebrtc/examples/objcnativeapi/objc/NADAppDelegate.h
new file mode 100644
index 0000000000..02372dbfd2
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/NADAppDelegate.h
@@ -0,0 +1,17 @@
+/*
+ *  Copyright 2018 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 <UIKit/UIKit.h>
+
+@interface NADAppDelegate : UIResponder <UIApplicationDelegate>
+
+@property(strong, nonatomic) UIWindow* window;
+
+@end
diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/NADAppDelegate.m b/third_party/libwebrtc/examples/objcnativeapi/objc/NADAppDelegate.m
new file mode 100644
index 0000000000..254dd3be76
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/NADAppDelegate.m
@@ -0,0 +1,63 @@
+/*
+ *  Copyright 2018 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 "NADAppDelegate.h"
+
+#import "NADViewController.h"
+
+@interface NADAppDelegate ()
+@end
+
+@implementation NADAppDelegate
+
+@synthesize window = _window;
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  [_window makeKeyAndVisible];
+
+  NADViewController *viewController = [[NADViewController alloc] init];
+  _window.rootViewController = viewController;
+
+  return YES;
+}
+
+- (void)applicationWillResignActive:(UIApplication *)application {
+  // Sent when the application is about to move from active to inactive state. This can occur for
+  // certain types of temporary interruptions (such as an incoming phone call or SMS message) or
+  // when the user quits the application and it begins the transition to the background state. Use
+  // this method to pause ongoing tasks, disable timers, and invalidate graphics rendering
+  // callbacks. Games should use this method to pause the game.
+}
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+  // Use this method to release shared resources, save user data, invalidate timers, and store
+  // enough application state information to restore your application to its current state in case
+  // it is terminated later. If your application supports background execution, this method is
+  // called instead of applicationWillTerminate: when the user quits.
+}
+
+- (void)applicationWillEnterForeground:(UIApplication *)application {
+  // Called as part of the transition from the background to the active state; here you can undo
+  // many of the changes made on entering the background.
+}
+
+- (void)applicationDidBecomeActive:(UIApplication *)application {
+  // Restart any tasks that were paused (or not yet started) while the application was inactive. If
+  // the application was previously in the background, optionally refresh the user interface.
+}
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+  // Called when the application is about to terminate. Save data if appropriate. See also
+  // applicationDidEnterBackground:.
+}
+
+@end
diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/NADViewController.h b/third_party/libwebrtc/examples/objcnativeapi/objc/NADViewController.h
new file mode 100644
index 0000000000..c43bebb52d
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/NADViewController.h
@@ -0,0 +1,15 @@
+/*
+ *  Copyright 2018 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 <UIKit/UIKit.h>
+
+@interface NADViewController : UIViewController
+
+@end
diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/NADViewController.mm b/third_party/libwebrtc/examples/objcnativeapi/objc/NADViewController.mm
new file mode 100644
index 0000000000..fd244799f8
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/NADViewController.mm
@@ -0,0 +1,154 @@
+/*
+ *  Copyright 2018 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 "NADViewController.h"
+
+#import "sdk/objc/base/RTCVideoRenderer.h"
+#import "sdk/objc/components/capturer/RTCCameraVideoCapturer.h"
+#import "sdk/objc/components/renderer/metal/RTCMTLVideoView.h"
+#import "sdk/objc/helpers/RTCCameraPreviewView.h"
+
+#include <memory>
+
+#include "examples/objcnativeapi/objc/objc_call_client.h"
+
+@interface NADViewController ()
+
+@property(nonatomic) RTC_OBJC_TYPE(RTCCameraVideoCapturer) * capturer;
+@property(nonatomic) RTC_OBJC_TYPE(RTCCameraPreviewView) * localVideoView;
+@property(nonatomic) __kindof UIView<RTC_OBJC_TYPE(RTCVideoRenderer)> *remoteVideoView;
+@property(nonatomic) UIButton *callButton;
+@property(nonatomic) UIButton *hangUpButton;
+
+@end
+
+@implementation NADViewController {
+  std::unique_ptr<webrtc_examples::ObjCCallClient> _call_client;
+
+  UIView *_view;
+}
+
+@synthesize capturer = _capturer;
+@synthesize localVideoView = _localVideoView;
+@synthesize remoteVideoView = _remoteVideoView;
+@synthesize callButton = _callButton;
+@synthesize hangUpButton = _hangUpButton;
+
+#pragma mark - View controller lifecycle
+
+- (void)loadView {
+  _view = [[UIView alloc] initWithFrame:CGRectZero];
+
+  _remoteVideoView = [[RTC_OBJC_TYPE(RTCMTLVideoView) alloc] initWithFrame:CGRectZero];
+  _remoteVideoView.translatesAutoresizingMaskIntoConstraints = NO;
+  [_view addSubview:_remoteVideoView];
+
+  _localVideoView = [[RTC_OBJC_TYPE(RTCCameraPreviewView) alloc] initWithFrame:CGRectZero];
+  _localVideoView.translatesAutoresizingMaskIntoConstraints = NO;
+  [_view addSubview:_localVideoView];
+
+  _callButton = [UIButton buttonWithType:UIButtonTypeSystem];
+  _callButton.translatesAutoresizingMaskIntoConstraints = NO;
+  [_callButton setTitle:@"Call" forState:UIControlStateNormal];
+  [_callButton addTarget:self action:@selector(call:) forControlEvents:UIControlEventTouchUpInside];
+  [_view addSubview:_callButton];
+
+  _hangUpButton = [UIButton buttonWithType:UIButtonTypeSystem];
+  _hangUpButton.translatesAutoresizingMaskIntoConstraints = NO;
+  [_hangUpButton setTitle:@"Hang up" forState:UIControlStateNormal];
+  [_hangUpButton addTarget:self
+                    action:@selector(hangUp:)
+          forControlEvents:UIControlEventTouchUpInside];
+  [_view addSubview:_hangUpButton];
+
+  UILayoutGuide *margin = _view.layoutMarginsGuide;
+  [_remoteVideoView.leadingAnchor constraintEqualToAnchor:margin.leadingAnchor].active = YES;
+  [_remoteVideoView.topAnchor constraintEqualToAnchor:margin.topAnchor].active = YES;
+  [_remoteVideoView.trailingAnchor constraintEqualToAnchor:margin.trailingAnchor].active = YES;
+  [_remoteVideoView.bottomAnchor constraintEqualToAnchor:margin.bottomAnchor].active = YES;
+
+  [_localVideoView.leadingAnchor constraintEqualToAnchor:margin.leadingAnchor constant:8.0].active =
+      YES;
+  [_localVideoView.topAnchor constraintEqualToAnchor:margin.topAnchor constant:8.0].active = YES;
+  [_localVideoView.widthAnchor constraintEqualToConstant:60].active = YES;
+  [_localVideoView.heightAnchor constraintEqualToConstant:60].active = YES;
+
+  [_callButton.leadingAnchor constraintEqualToAnchor:margin.leadingAnchor constant:8.0].active =
+      YES;
+  [_callButton.bottomAnchor constraintEqualToAnchor:margin.bottomAnchor constant:8.0].active = YES;
+  [_callButton.widthAnchor constraintEqualToConstant:100].active = YES;
+  [_callButton.heightAnchor constraintEqualToConstant:40].active = YES;
+
+  [_hangUpButton.trailingAnchor constraintEqualToAnchor:margin.trailingAnchor constant:8.0].active =
+      YES;
+  [_hangUpButton.bottomAnchor constraintEqualToAnchor:margin.bottomAnchor constant:8.0].active =
+      YES;
+  [_hangUpButton.widthAnchor constraintEqualToConstant:100].active = YES;
+  [_hangUpButton.heightAnchor constraintEqualToConstant:40].active = YES;
+
+  self.view = _view;
+}
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  self.capturer = [[RTC_OBJC_TYPE(RTCCameraVideoCapturer) alloc] init];
+  self.localVideoView.captureSession = self.capturer.captureSession;
+
+  _call_client.reset(new webrtc_examples::ObjCCallClient());
+
+  // Start capturer.
+  AVCaptureDevice *selectedDevice = nil;
+  NSArray<AVCaptureDevice *> *captureDevices =
+      [RTC_OBJC_TYPE(RTCCameraVideoCapturer) captureDevices];
+  for (AVCaptureDevice *device in captureDevices) {
+    if (device.position == AVCaptureDevicePositionFront) {
+      selectedDevice = device;
+      break;
+    }
+  }
+
+  AVCaptureDeviceFormat *selectedFormat = nil;
+  int targetWidth = 640;
+  int targetHeight = 480;
+  int currentDiff = INT_MAX;
+  NSArray<AVCaptureDeviceFormat *> *formats =
+      [RTC_OBJC_TYPE(RTCCameraVideoCapturer) supportedFormatsForDevice:selectedDevice];
+  for (AVCaptureDeviceFormat *format in formats) {
+    CMVideoDimensions dimension = CMVideoFormatDescriptionGetDimensions(format.formatDescription);
+    FourCharCode pixelFormat = CMFormatDescriptionGetMediaSubType(format.formatDescription);
+    int diff = abs(targetWidth - dimension.width) + abs(targetHeight - dimension.height);
+    if (diff < currentDiff) {
+      selectedFormat = format;
+      currentDiff = diff;
+    } else if (diff == currentDiff && pixelFormat == [_capturer preferredOutputPixelFormat]) {
+      selectedFormat = format;
+    }
+  }
+
+  [self.capturer startCaptureWithDevice:selectedDevice format:selectedFormat fps:30];
+}
+
+- (void)didReceiveMemoryWarning {
+  [super didReceiveMemoryWarning];
+  // Dispose of any resources that can be recreated.
+}
+
+#pragma mark - Actions
+
+- (IBAction)call:(id)sender {
+  _call_client->Call(self.capturer, self.remoteVideoView);
+}
+
+- (IBAction)hangUp:(id)sender {
+  _call_client->Hangup();
+}
+
+@end
diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/main.m b/third_party/libwebrtc/examples/objcnativeapi/objc/main.m
new file mode 100644
index 0000000000..2c3b5fbbfb
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/main.m
@@ -0,0 +1,18 @@
+/*
+ *  Copyright 2018 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 <UIKit/UIKit.h>
+#import "NADAppDelegate.h"
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([NADAppDelegate class]));
+  }
+}
diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/objc_call_client.h b/third_party/libwebrtc/examples/objcnativeapi/objc/objc_call_client.h
new file mode 100644
index 0000000000..cb8501d9ce
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/objc_call_client.h
@@ -0,0 +1,82 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#ifndef EXAMPLES_OBJCNATIVEAPI_OBJCCALLCLIENT_H_
+#define EXAMPLES_OBJCNATIVEAPI_OBJCCALLCLIENT_H_
+
+#include <memory>
+#include <string>
+
+#import "sdk/objc/base/RTCMacros.h"
+
+#include "api/peer_connection_interface.h"
+#include "api/scoped_refptr.h"
+#include "api/sequence_checker.h"
+#include "rtc_base/synchronization/mutex.h"
+
+@class RTC_OBJC_TYPE(RTCVideoCapturer);
+@protocol RTC_OBJC_TYPE
+(RTCVideoRenderer);
+
+namespace webrtc_examples {
+
+class ObjCCallClient {
+ public:
+  ObjCCallClient();
+
+  void Call(RTC_OBJC_TYPE(RTCVideoCapturer) * capturer,
+            id<RTC_OBJC_TYPE(RTCVideoRenderer)> remote_renderer);
+  void Hangup();
+
+ private:
+  class PCObserver : public webrtc::PeerConnectionObserver {
+   public:
+    explicit PCObserver(ObjCCallClient* client);
+
+    void OnSignalingChange(webrtc::PeerConnectionInterface::SignalingState new_state) override;
+    void OnDataChannel(rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel) override;
+    void OnRenegotiationNeeded() override;
+    void OnIceConnectionChange(
+        webrtc::PeerConnectionInterface::IceConnectionState new_state) override;
+    void OnIceGatheringChange(
+        webrtc::PeerConnectionInterface::IceGatheringState new_state) override;
+    void OnIceCandidate(const webrtc::IceCandidateInterface* candidate) override;
+
+   private:
+    ObjCCallClient* const client_;
+  };
+
+  void CreatePeerConnectionFactory() RTC_RUN_ON(thread_checker_);
+  void CreatePeerConnection() RTC_RUN_ON(thread_checker_);
+  void Connect() RTC_RUN_ON(thread_checker_);
+
+  webrtc::SequenceChecker thread_checker_;
+
+  bool call_started_ RTC_GUARDED_BY(thread_checker_);
+
+  const std::unique_ptr<PCObserver> pc_observer_;
+
+  rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface> pcf_ RTC_GUARDED_BY(thread_checker_);
+  std::unique_ptr<rtc::Thread> network_thread_ RTC_GUARDED_BY(thread_checker_);
+  std::unique_ptr<rtc::Thread> worker_thread_ RTC_GUARDED_BY(thread_checker_);
+  std::unique_ptr<rtc::Thread> signaling_thread_ RTC_GUARDED_BY(thread_checker_);
+
+  std::unique_ptr<rtc::VideoSinkInterface<webrtc::VideoFrame>> remote_sink_
+      RTC_GUARDED_BY(thread_checker_);
+  rtc::scoped_refptr<webrtc::VideoTrackSourceInterface> video_source_
+      RTC_GUARDED_BY(thread_checker_);
+
+  webrtc::Mutex pc_mutex_;
+  rtc::scoped_refptr<webrtc::PeerConnectionInterface> pc_ RTC_GUARDED_BY(pc_mutex_);
+};
+
+}  // namespace webrtc_examples
+
+#endif  // EXAMPLES_OBJCNATIVEAPI_OBJCCALLCLIENT_H_
diff --git a/third_party/libwebrtc/examples/objcnativeapi/objc/objc_call_client.mm b/third_party/libwebrtc/examples/objcnativeapi/objc/objc_call_client.mm
new file mode 100644
index 0000000000..7dd57b499b
--- /dev/null
+++ b/third_party/libwebrtc/examples/objcnativeapi/objc/objc_call_client.mm
@@ -0,0 +1,238 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#include "examples/objcnativeapi/objc/objc_call_client.h"
+
+#include <memory>
+#include <utility>
+
+#import "sdk/objc/base/RTCVideoRenderer.h"
+#import "sdk/objc/components/video_codec/RTCDefaultVideoDecoderFactory.h"
+#import "sdk/objc/components/video_codec/RTCDefaultVideoEncoderFactory.h"
+#import "sdk/objc/helpers/RTCCameraPreviewView.h"
+
+#include "api/audio_codecs/builtin_audio_decoder_factory.h"
+#include "api/audio_codecs/builtin_audio_encoder_factory.h"
+#include "api/peer_connection_interface.h"
+#include "api/rtc_event_log/rtc_event_log_factory.h"
+#include "api/task_queue/default_task_queue_factory.h"
+#include "media/engine/webrtc_media_engine.h"
+#include "modules/audio_processing/include/audio_processing.h"
+#include "sdk/objc/native/api/video_capturer.h"
+#include "sdk/objc/native/api/video_decoder_factory.h"
+#include "sdk/objc/native/api/video_encoder_factory.h"
+#include "sdk/objc/native/api/video_renderer.h"
+
+namespace webrtc_examples {
+
+namespace {
+
+class CreateOfferObserver : public webrtc::CreateSessionDescriptionObserver {
+ public:
+  explicit CreateOfferObserver(rtc::scoped_refptr<webrtc::PeerConnectionInterface> pc);
+
+  void OnSuccess(webrtc::SessionDescriptionInterface* desc) override;
+  void OnFailure(webrtc::RTCError error) override;
+
+ private:
+  const rtc::scoped_refptr<webrtc::PeerConnectionInterface> pc_;
+};
+
+class SetRemoteSessionDescriptionObserver : public webrtc::SetRemoteDescriptionObserverInterface {
+ public:
+  void OnSetRemoteDescriptionComplete(webrtc::RTCError error) override;
+};
+
+class SetLocalSessionDescriptionObserver : public webrtc::SetLocalDescriptionObserverInterface {
+ public:
+  void OnSetLocalDescriptionComplete(webrtc::RTCError error) override;
+};
+
+}  // namespace
+
+ObjCCallClient::ObjCCallClient()
+    : call_started_(false), pc_observer_(std::make_unique<PCObserver>(this)) {
+  thread_checker_.Detach();
+  CreatePeerConnectionFactory();
+}
+
+void ObjCCallClient::Call(RTC_OBJC_TYPE(RTCVideoCapturer) * capturer,
+                          id<RTC_OBJC_TYPE(RTCVideoRenderer)> remote_renderer) {
+  RTC_DCHECK_RUN_ON(&thread_checker_);
+
+  webrtc::MutexLock lock(&pc_mutex_);
+  if (call_started_) {
+    RTC_LOG(LS_WARNING) << "Call already started.";
+    return;
+  }
+  call_started_ = true;
+
+  remote_sink_ = webrtc::ObjCToNativeVideoRenderer(remote_renderer);
+
+  video_source_ =
+      webrtc::ObjCToNativeVideoCapturer(capturer, signaling_thread_.get(), worker_thread_.get());
+
+  CreatePeerConnection();
+  Connect();
+}
+
+void ObjCCallClient::Hangup() {
+  RTC_DCHECK_RUN_ON(&thread_checker_);
+
+  call_started_ = false;
+
+  {
+    webrtc::MutexLock lock(&pc_mutex_);
+    if (pc_ != nullptr) {
+      pc_->Close();
+      pc_ = nullptr;
+    }
+  }
+
+  remote_sink_ = nullptr;
+  video_source_ = nullptr;
+}
+
+void ObjCCallClient::CreatePeerConnectionFactory() {
+  network_thread_ = rtc::Thread::CreateWithSocketServer();
+  network_thread_->SetName("network_thread", nullptr);
+  RTC_CHECK(network_thread_->Start()) << "Failed to start thread";
+
+  worker_thread_ = rtc::Thread::Create();
+  worker_thread_->SetName("worker_thread", nullptr);
+  RTC_CHECK(worker_thread_->Start()) << "Failed to start thread";
+
+  signaling_thread_ = rtc::Thread::Create();
+  signaling_thread_->SetName("signaling_thread", nullptr);
+  RTC_CHECK(signaling_thread_->Start()) << "Failed to start thread";
+
+  webrtc::PeerConnectionFactoryDependencies dependencies;
+  dependencies.network_thread = network_thread_.get();
+  dependencies.worker_thread = worker_thread_.get();
+  dependencies.signaling_thread = signaling_thread_.get();
+  dependencies.task_queue_factory = webrtc::CreateDefaultTaskQueueFactory();
+  cricket::MediaEngineDependencies media_deps;
+  media_deps.task_queue_factory = dependencies.task_queue_factory.get();
+  media_deps.audio_encoder_factory = webrtc::CreateBuiltinAudioEncoderFactory();
+  media_deps.audio_decoder_factory = webrtc::CreateBuiltinAudioDecoderFactory();
+  media_deps.video_encoder_factory = webrtc::ObjCToNativeVideoEncoderFactory(
+      [[RTC_OBJC_TYPE(RTCDefaultVideoEncoderFactory) alloc] init]);
+  media_deps.video_decoder_factory = webrtc::ObjCToNativeVideoDecoderFactory(
+      [[RTC_OBJC_TYPE(RTCDefaultVideoDecoderFactory) alloc] init]);
+  media_deps.audio_processing = webrtc::AudioProcessingBuilder().Create();
+  dependencies.media_engine = cricket::CreateMediaEngine(std::move(media_deps));
+  RTC_LOG(LS_INFO) << "Media engine created: " << dependencies.media_engine.get();
+  dependencies.call_factory = webrtc::CreateCallFactory();
+  dependencies.event_log_factory =
+      std::make_unique<webrtc::RtcEventLogFactory>(dependencies.task_queue_factory.get());
+  pcf_ = webrtc::CreateModularPeerConnectionFactory(std::move(dependencies));
+  RTC_LOG(LS_INFO) << "PeerConnectionFactory created: " << pcf_.get();
+}
+
+void ObjCCallClient::CreatePeerConnection() {
+  webrtc::MutexLock lock(&pc_mutex_);
+  webrtc::PeerConnectionInterface::RTCConfiguration config;
+  config.sdp_semantics = webrtc::SdpSemantics::kUnifiedPlan;
+  // Encryption has to be disabled for loopback to work.
+  webrtc::PeerConnectionFactoryInterface::Options options;
+  options.disable_encryption = true;
+  pcf_->SetOptions(options);
+  webrtc::PeerConnectionDependencies pc_dependencies(pc_observer_.get());
+  pc_ = pcf_->CreatePeerConnectionOrError(config, std::move(pc_dependencies)).MoveValue();
+  RTC_LOG(LS_INFO) << "PeerConnection created: " << pc_.get();
+
+  rtc::scoped_refptr<webrtc::VideoTrackInterface> local_video_track =
+      pcf_->CreateVideoTrack("video", video_source_.get());
+  pc_->AddTransceiver(local_video_track);
+  RTC_LOG(LS_INFO) << "Local video sink set up: " << local_video_track.get();
+
+  for (const rtc::scoped_refptr<webrtc::RtpTransceiverInterface>& tranceiver :
+       pc_->GetTransceivers()) {
+    rtc::scoped_refptr<webrtc::MediaStreamTrackInterface> track = tranceiver->receiver()->track();
+    if (track && track->kind() == webrtc::MediaStreamTrackInterface::kVideoKind) {
+      static_cast<webrtc::VideoTrackInterface*>(track.get())
+          ->AddOrUpdateSink(remote_sink_.get(), rtc::VideoSinkWants());
+      RTC_LOG(LS_INFO) << "Remote video sink set up: " << track.get();
+      break;
+    }
+  }
+}
+
+void ObjCCallClient::Connect() {
+  webrtc::MutexLock lock(&pc_mutex_);
+  pc_->CreateOffer(rtc::make_ref_counted<CreateOfferObserver>(pc_).get(),
+                   webrtc::PeerConnectionInterface::RTCOfferAnswerOptions());
+}
+
+ObjCCallClient::PCObserver::PCObserver(ObjCCallClient* client) : client_(client) {}
+
+void ObjCCallClient::PCObserver::OnSignalingChange(
+    webrtc::PeerConnectionInterface::SignalingState new_state) {
+  RTC_LOG(LS_INFO) << "OnSignalingChange: " << new_state;
+}
+
+void ObjCCallClient::PCObserver::OnDataChannel(
+    rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel) {
+  RTC_LOG(LS_INFO) << "OnDataChannel";
+}
+
+void ObjCCallClient::PCObserver::OnRenegotiationNeeded() {
+  RTC_LOG(LS_INFO) << "OnRenegotiationNeeded";
+}
+
+void ObjCCallClient::PCObserver::OnIceConnectionChange(
+    webrtc::PeerConnectionInterface::IceConnectionState new_state) {
+  RTC_LOG(LS_INFO) << "OnIceConnectionChange: " << new_state;
+}
+
+void ObjCCallClient::PCObserver::OnIceGatheringChange(
+    webrtc::PeerConnectionInterface::IceGatheringState new_state) {
+  RTC_LOG(LS_INFO) << "OnIceGatheringChange: " << new_state;
+}
+
+void ObjCCallClient::PCObserver::OnIceCandidate(const webrtc::IceCandidateInterface* candidate) {
+  RTC_LOG(LS_INFO) << "OnIceCandidate: " << candidate->server_url();
+  webrtc::MutexLock lock(&client_->pc_mutex_);
+  RTC_DCHECK(client_->pc_ != nullptr);
+  client_->pc_->AddIceCandidate(candidate);
+}
+
+CreateOfferObserver::CreateOfferObserver(rtc::scoped_refptr<webrtc::PeerConnectionInterface> pc)
+    : pc_(pc) {}
+
+void CreateOfferObserver::OnSuccess(webrtc::SessionDescriptionInterface* desc) {
+  std::string sdp;
+  desc->ToString(&sdp);
+  RTC_LOG(LS_INFO) << "Created offer: " << sdp;
+
+  // Ownership of desc was transferred to us, now we transfer it forward.
+  pc_->SetLocalDescription(absl::WrapUnique(desc),
+                           rtc::make_ref_counted<SetLocalSessionDescriptionObserver>());
+
+  // Generate a fake answer.
+  std::unique_ptr<webrtc::SessionDescriptionInterface> answer(
+      webrtc::CreateSessionDescription(webrtc::SdpType::kAnswer, sdp));
+  pc_->SetRemoteDescription(std::move(answer),
+                            rtc::make_ref_counted<SetRemoteSessionDescriptionObserver>());
+}
+
+void CreateOfferObserver::OnFailure(webrtc::RTCError error) {
+  RTC_LOG(LS_INFO) << "Failed to create offer: " << error.message();
+}
+
+void SetRemoteSessionDescriptionObserver::OnSetRemoteDescriptionComplete(webrtc::RTCError error) {
+  RTC_LOG(LS_INFO) << "Set remote description: " << error.message();
+}
+
+void SetLocalSessionDescriptionObserver::OnSetLocalDescriptionComplete(webrtc::RTCError error) {
+  RTC_LOG(LS_INFO) << "Set local description: " << error.message();
+}
+
+}  // namespace webrtc_examples