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#import "ViewController.h"
#import <AVKit/AVKit.h>

@import GoogleInteractiveMediaAds;
ViewController.m

import AVFoundation
import GoogleInteractiveMediaAds
import UIKit
ViewController.swift

// Live stream asset key, VOD content source and video IDs, and backup content URL.
static NSString *const kAssetKey = @"c-rArva4ShKVIAkNfy6HUQ";
static NSString *const kContentSourceID = @"2548831";
static NSString *const kVideoID = @"tears-of-steel";
static NSString *const kNetworkCode = @"21775744923";
static NSString *const kBackupStreamURLString =
    @"http://googleimadev-vh.akamaihd.net/i/big_buck_bunny/bbb-,480p,720p,1080p,.mov.csmil/"
    @"master.m3u8";
static const StreamType kDefaultStreamType = StreamTypeLive;

@interface ViewController () <IMAAdsLoaderDelegate,
                              IMAStreamManagerDelegate,
                              AVPlayerViewControllerDelegate>
@property(nonatomic) IMAAdsLoader *adsLoader;
@property(nonatomic) IMAAdDisplayContainer *adDisplayContainer;
@property(nonatomic) UIView *adContainerView;
@property(nonatomic) id<IMAVideoDisplay> videoDisplay;
@property(nonatomic) IMAStreamManager *streamManager;
@property(nonatomic) AVPlayerViewController *playerViewController;
@property(nonatomic, getter=isAdBreakActive) BOOL adBreakActive;
@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  self.view.backgroundColor = [UIColor blackColor];
  self.streamType = kDefaultStreamType;
  [self setupAdsLoader];
  [self setupPlayer];
  [self setupAdContainer];
}

- (void)viewDidAppear:(BOOL)animated {
  [super viewDidAppear:animated];
  [self requestStream];
}

- (void)setupPlayer {
  // Create a stream video player.
  AVPlayer *player = [[AVPlayer alloc] init];
  self.playerViewController = [[AVPlayerViewController alloc] init];
  self.playerViewController.player = player;

  // Attach video player to view hierarchy.
  [self addChildViewController:self.playerViewController];
  [self.view addSubview:self.playerViewController.view];
  self.playerViewController.view.frame = self.view.bounds;
  [self.playerViewController didMoveToParentViewController:self];
}
ViewController.m

class ViewController:
  UIViewController,
  IMAAdsLoaderDelegate,
  IMAStreamManagerDelegate,
  AVPlayerViewControllerDelegate
{
  // Live stream asset key, VOD content source and video IDs, Google Ad Manager network code, and
  // backup content URL.
  static let assetKey = "c-rArva4ShKVIAkNfy6HUQ"
  static let contentSourceID = "2548831"
  static let videoID = "tears-of-steel"
  static let networkCode = "21775744923"
  static let backupStreamURLString =
    "http://googleimadev-vh.akamaihd.net/i/big_buck_bunny/bbb-,480p,720p,1080p,.mov.csmil/master.m3u8"

  var adsLoader: IMAAdsLoader?
  var videoDisplay: IMAAVPlayerVideoDisplay!
  var adDisplayContainer: IMAAdDisplayContainer?
  var adContainerView: UIView?
  private var streamManager: IMAStreamManager?
  private var contentPlayhead: IMAAVPlayerContentPlayhead?
  private var playerViewController: AVPlayerViewController!
  private var userSeekTime = 0.0
  private var adBreakActive = false

  private enum StreamType {
    case live
    /// Video on demand.
    case vod
  }

  /// Set the stream type here.
  private let currentStreamType: StreamType = .live

  deinit {
    NotificationCenter.default.removeObserver(self)
  }

  override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.black

    setupAdsLoader()
    setupPlayer()
    setupAdContainer()
  }

  override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    requestStream()
  }

  func setupPlayer() {
    let player = AVPlayer()
    let playerViewController = AVPlayerViewController()
    playerViewController.delegate = self
    playerViewController.player = player

    // Set up our content playhead and contentComplete callback.
    contentPlayhead = IMAAVPlayerContentPlayhead(avPlayer: player)
    NotificationCenter.default.addObserver(
      self,
      selector: #selector(ViewController.contentDidFinishPlaying(_:)),
      name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
      object: player.currentItem)

    self.addChild(playerViewController)
    playerViewController.view.frame = self.view.bounds
    self.view.insertSubview(playerViewController.view, at: 0)
    playerViewController.didMove(toParent: self)
    self.playerViewController = playerViewController
  }
ViewController.swift

- (void)setupAdsLoader {
  self.adsLoader = [[IMAAdsLoader alloc] init];
  self.adsLoader.delegate = self;
}

- (void)setupAdContainer {
  // Attach the ad container to the view hierarchy on top of the player.
  self.adContainerView = [[UIView alloc] init];
  [self.view addSubview:self.adContainerView];
  self.adContainerView.frame = self.view.bounds;
  // Keep hidden initially, until an ad break.
  self.adContainerView.hidden = YES;
}
ViewController.m

func setupAdsLoader() {
  let adsLoader = IMAAdsLoader(settings: nil)
  adsLoader.delegate = self
  self.adsLoader = adsLoader
}

func setupAdContainer() {
  // Attach the ad container to the view hierarchy on top of the player.
  let adContainerView = UIView()
  self.view.addSubview(adContainerView)
  adContainerView.frame = self.view.bounds
  // Keep hidden initially, until an ad break.
  adContainerView.isHidden = true
  self.adContainerView = adContainerView
}
ViewController.swift

- (void)requestStream {
  self.videoDisplay =
      [[IMAAVPlayerVideoDisplay alloc] initWithAVPlayer:self.playerViewController.player];
  self.adDisplayContainer = [[IMAAdDisplayContainer alloc] initWithAdContainer:self.adContainerView
                                                                viewController:self];

  // Use the streamType property to determine which request to create.
  IMAStreamRequest *request;

  switch (self.streamType) {
    case StreamTypeLive: {
      request = [[IMALiveStreamRequest alloc] initWithAssetKey:kAssetKey
                                                   networkCode:kNetworkCode
                                            adDisplayContainer:self.adDisplayContainer
                                                  videoDisplay:self.videoDisplay
                                                   userContext:nil];
      NSLog(@"IMA: Requesting Live Stream with Asset Key: %@.", kAssetKey);
      break;
    }
    case StreamTypeVOD: {
      request = [[IMAVODStreamRequest alloc] initWithContentSourceID:kContentSourceID
                                                             videoID:kVideoID
                                                         networkCode:kNetworkCode
                                                  adDisplayContainer:self.adDisplayContainer
                                                        videoDisplay:self.videoDisplay
                                                         userContext:nil];
      NSLog(@"IMA: Requesting VOD Stream with Video ID: %@.", kVideoID);
      break;
    }
  }

  if (request) {
    [self.adsLoader requestStreamWithRequest:request];
  } else {
    // Fallback or error handling if no request object was created
    NSLog(@"IMA Error: Could not create stream request for unknown type.");
    [self playBackupStream];
  }
}
ViewController.m

func requestStream() {
  guard let playerViewController = self.playerViewController else { return }
  guard let adContainerView = self.adContainerView else { return }
  guard let adsLoader = self.adsLoader else { return }

  self.videoDisplay = IMAAVPlayerVideoDisplay(avPlayer: playerViewController.player!)
  let adDisplayContainer = IMAAdDisplayContainer(
    adContainer: adContainerView, viewController: self)
  self.adDisplayContainer = adDisplayContainer

  // Variable to hold the specific stream request object.
  let request: IMAStreamRequest

  switch self.currentStreamType {
  case .live:
    // Create a live stream request.
    request = IMALiveStreamRequest(
      assetKey: ViewController.assetKey,
      networkCode: ViewController.networkCode,
      adDisplayContainer: adDisplayContainer,
      videoDisplay: self.videoDisplay,
      pictureInPictureProxy: nil,
      userContext: nil)
    print("IMA: Requesting Live Stream with asset key \(ViewController.assetKey)")

  case .vod:
    // Create a VOD stream request.
    request = IMAVODStreamRequest(
      contentSourceID: ViewController.contentSourceID,
      videoID: ViewController.videoID,
      networkCode: ViewController.networkCode,
      adDisplayContainer: adDisplayContainer,
      videoDisplay: self.videoDisplay,
      pictureInPictureProxy: nil,
      userContext: nil)
    print(
      "IMA: Requesting VOD Stream with content source ID \(ViewController.contentSourceID) and "
        + "video ID \(ViewController.videoID)")
  }

  adsLoader.requestStream(with: request)
}
ViewController.swift

- (void)playBackupStream {
  NSURL *backupStreamURL = [NSURL URLWithString:kBackupStreamURLString];
  [self.videoDisplay loadStream:backupStreamURL withSubtitles:@[]];
  [self.videoDisplay play];
  [self startMediaSession];
}

- (void)startMediaSession {
  [[AVAudioSession sharedInstance] setActive:YES error:nil];
  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
}

#pragma mark - IMAAdsLoaderDelegate

- (void)adsLoader:(IMAAdsLoader *)loader adsLoadedWithData:(IMAAdsLoadedData *)adsLoadedData {
  // Initialize and listen to stream manager's events.
  self.streamManager = adsLoadedData.streamManager;
  self.streamManager.delegate = self;
  [self.streamManager initializeWithAdsRenderingSettings:nil];
  NSLog(@"Stream created with: %@.", self.streamManager.streamId);
}

- (void)adsLoader:(IMAAdsLoader *)loader failedWithErrorData:(IMAAdLoadingErrorData *)adErrorData {
  // Fall back to playing the backup stream.
  NSLog(@"Error loading ads: %@", adErrorData.adError.message);
  [self playBackupStream];
}
ViewController.m

@objc func contentDidFinishPlaying(_ notification: Notification) {
  guard let adsLoader = self.adsLoader else { return }
  adsLoader.contentComplete()
}

func startMediaSession() {
  try? AVAudioSession.sharedInstance().setActive(true, options: [])
  try? AVAudioSession.sharedInstance().setCategory(.playback)
}

// MARK: - IMAAdsLoaderDelegate

func adsLoader(_ loader: IMAAdsLoader, adsLoadedWith adsLoadedData: IMAAdsLoadedData) {
  let streamManager = adsLoadedData.streamManager!
  streamManager.delegate = self
  streamManager.initialize(with: nil)
  self.streamManager = streamManager
}

func adsLoader(_ loader: IMAAdsLoader, failedWith adErrorData: IMAAdLoadingErrorData) {
  print("Error loading ads: \(adErrorData.adError.message)")
  let streamUrl = URL(string: ViewController.backupStreamURLString)
  self.videoDisplay.loadStream(streamUrl!, withSubtitles: [])
  self.videoDisplay.play()
  playerViewController.player?.play()
}
ViewController.swift

#pragma mark - IMAStreamManagerDelegate

- (void)streamManager:(IMAStreamManager *)streamManager didReceiveAdEvent:(IMAAdEvent *)event {
  NSLog(@"StreamManager event (%@).", event.typeString);
  switch (event.type) {
    case kIMAAdEvent_STREAM_STARTED: {
      [self startMediaSession];
      break;
    }
    case kIMAAdEvent_STARTED: {
      // Log extended data.
      NSString *extendedAdPodInfo = [[NSString alloc]
          initWithFormat:@"Showing ad %zd/%zd, bumper: %@, title: %@, description: %@, contentType:"
                         @"%@, pod index: %zd, time offset: %lf, max duration: %lf.",
                         event.ad.adPodInfo.adPosition, event.ad.adPodInfo.totalAds,
                         event.ad.adPodInfo.isBumper ? @"YES" : @"NO", event.ad.adTitle,
                         event.ad.adDescription, event.ad.contentType, event.ad.adPodInfo.podIndex,
                         event.ad.adPodInfo.timeOffset, event.ad.adPodInfo.maxDuration];

      NSLog(@"%@", extendedAdPodInfo);
      break;
    }
    case kIMAAdEvent_AD_BREAK_STARTED: {
      self.adContainerView.hidden = NO;
      // Trigger an update to send focus to the ad display container.
      self.adBreakActive = YES;
      [self setNeedsFocusUpdate];
      break;
    }
    case kIMAAdEvent_AD_BREAK_ENDED: {
      self.adContainerView.hidden = YES;
      // Trigger an update to send focus to the content player.
      self.adBreakActive = NO;
      [self setNeedsFocusUpdate];
      break;
    }
    case kIMAAdEvent_ICON_FALLBACK_IMAGE_CLOSED: {
      // Resume playback after the user has closed the dialog.
      [self.videoDisplay play];
      break;
    }
    default:
      break;
  }
}

- (void)streamManager:(IMAStreamManager *)streamManager didReceiveAdError:(IMAAdError *)error {
  // Fall back to playing the backup stream.
  NSLog(@"StreamManager error: %@", error.message);
  [self playBackupStream];
}
ViewController.m

// MARK: - IMAStreamManagerDelegate
func streamManager(_ streamManager: IMAStreamManager, didReceive event: IMAAdEvent) {
  print("StreamManager event \(event.typeString).")
  switch event.type {
  case IMAAdEventType.STREAM_STARTED:
    self.startMediaSession()
  case IMAAdEventType.STARTED:
    // Log extended data.
    if let ad = event.ad {
      let extendedAdPodInfo = String(
        format: "Showing ad %zd/%zd, bumper: %@, title: %@, "
          + "description: %@, contentType:%@, pod index: %zd, "
          + "time offset: %lf, max duration: %lf.",
        ad.adPodInfo.adPosition,
        ad.adPodInfo.totalAds,
        ad.adPodInfo.isBumper ? "YES" : "NO",
        ad.adTitle,
        ad.adDescription,
        ad.contentType,
        ad.adPodInfo.podIndex,
        ad.adPodInfo.timeOffset,
        ad.adPodInfo.maxDuration)

      print("\(extendedAdPodInfo)")
    }
    break
  case IMAAdEventType.AD_BREAK_STARTED:
    if let adContainerView = self.adContainerView {
      adContainerView.isHidden = false
    }
    // Trigger an update to send focus to the ad display container.
    adBreakActive = true
    setNeedsFocusUpdate()
    break
  case IMAAdEventType.AD_BREAK_ENDED:
    if let adContainerView = self.adContainerView {
      adContainerView.isHidden = true
    }
    // Trigger an update to send focus to the content player.
    adBreakActive = false
    setNeedsFocusUpdate()
    break
  case IMAAdEventType.ICON_FALLBACK_IMAGE_CLOSED:
    // Resume playback after the user has closed the dialog.
    self.videoDisplay.play()
    break
  default:
    break
  }
}

func streamManager(_ streamManager: IMAStreamManager, didReceive error: IMAAdError) {
  print("StreamManager error: \(error.message ?? "Unknown Error")")
}
ViewController.swift