examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.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 "ARDVideoCallViewController.h"

#import "WebRTC/RTCAudioSession.h"

#import "ARDAppClient.h"
#import "ARDCaptureController.h"
#import "ARDSettingsModel.h"
#import "ARDVideoCallView.h"
#import "WebRTC/RTCAVFoundationVideoSource.h"
#import "WebRTC/RTCDispatcher.h"
#import "WebRTC/RTCLogging.h"
#import "WebRTC/RTCMediaConstraints.h"

@interface ARDVideoCallViewController () <ARDAppClientDelegate,
                                          ARDVideoCallViewDelegate,
                                          RTCAudioSessionDelegate>
@property(nonatomic, strong) RTCVideoTrack *remoteVideoTrack;
@property(nonatomic, readonly) ARDVideoCallView *videoCallView;
@end

@implementation ARDVideoCallViewController {
  ARDAppClient *_client;
  RTCVideoTrack *_remoteVideoTrack;
  ARDCaptureController *_captureController;
  AVAudioSessionPortOverride _portOverride;
}

@synthesize videoCallView = _videoCallView;
@synthesize remoteVideoTrack = _remoteVideoTrack;
@synthesize delegate = _delegate;

- (instancetype)initForRoom:(NSString *)room
                 isLoopback:(BOOL)isLoopback
                   delegate:(id<ARDVideoCallViewControllerDelegate>)delegate {
  if (self = [super init]) {
    ARDSettingsModel *settingsModel = [[ARDSettingsModel alloc] init];
    _delegate = delegate;

    _client = [[ARDAppClient alloc] initWithDelegate:self];
    [_client connectToRoomWithId:room settings:settingsModel isLoopback:isLoopback];
  }
  return self;
}

- (void)loadView {
  _videoCallView = [[ARDVideoCallView alloc] initWithFrame:CGRectZero];
  _videoCallView.delegate = self;
  _videoCallView.statusLabel.text =
      [self statusTextForState:RTCIceConnectionStateNew];
  self.view = _videoCallView;

  RTCAudioSession *session = [RTCAudioSession sharedInstance];
  [session addDelegate:self];
}

#pragma mark - ARDAppClientDelegate

- (void)appClient:(ARDAppClient *)client
    didChangeState:(ARDAppClientState)state {
  switch (state) {
    case kARDAppClientStateConnected:
      RTCLog(@"Client connected.");
      break;
    case kARDAppClientStateConnecting:
      RTCLog(@"Client connecting.");
      break;
    case kARDAppClientStateDisconnected:
      RTCLog(@"Client disconnected.");
      [self hangup];
      break;
  }
}

- (void)appClient:(ARDAppClient *)client
    didChangeConnectionState:(RTCIceConnectionState)state {
  RTCLog(@"ICE state changed: %ld", (long)state);
  __weak ARDVideoCallViewController *weakSelf = self;
  dispatch_async(dispatch_get_main_queue(), ^{
    ARDVideoCallViewController *strongSelf = weakSelf;
    strongSelf.videoCallView.statusLabel.text =
        [strongSelf statusTextForState:state];
  });
}

- (void)appClient:(ARDAppClient *)client
    didCreateLocalCapturer:(RTCCameraVideoCapturer *)localCapturer {
  _videoCallView.localVideoView.captureSession = localCapturer.captureSession;
  ARDSettingsModel *settingsModel = [[ARDSettingsModel alloc] init];
  _captureController =
      [[ARDCaptureController alloc] initWithCapturer:localCapturer settings:settingsModel];
  [_captureController startCapture];
}

- (void)appClient:(ARDAppClient *)client
    didReceiveLocalVideoTrack:(RTCVideoTrack *)localVideoTrack {
}

- (void)appClient:(ARDAppClient *)client
    didReceiveRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack {
  self.remoteVideoTrack = remoteVideoTrack;
  _videoCallView.statusLabel.hidden = YES;
}

- (void)appClient:(ARDAppClient *)client
      didGetStats:(NSArray *)stats {
  _videoCallView.statsView.stats = stats;
  [_videoCallView setNeedsLayout];
}

- (void)appClient:(ARDAppClient *)client
         didError:(NSError *)error {
  NSString *message =
      [NSString stringWithFormat:@"%@", error.localizedDescription];
  [self hangup];
  [self showAlertWithMessage:message];
}

#pragma mark - ARDVideoCallViewDelegate

- (void)videoCallViewDidHangup:(ARDVideoCallView *)view {
  [self hangup];
}

- (void)videoCallViewDidSwitchCamera:(ARDVideoCallView *)view {
  // TODO(tkchin): Rate limit this so you can't tap continously on it.
  // Probably through an animation.
  [_captureController switchCamera];
}

- (void)videoCallViewDidChangeRoute:(ARDVideoCallView *)view {
  AVAudioSessionPortOverride override = AVAudioSessionPortOverrideNone;
  if (_portOverride == AVAudioSessionPortOverrideNone) {
    override = AVAudioSessionPortOverrideSpeaker;
  }
  [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeAudioSession
                               block:^{
    RTCAudioSession *session = [RTCAudioSession sharedInstance];
    [session lockForConfiguration];
    NSError *error = nil;
    if ([session overrideOutputAudioPort:override error:&error]) {
      _portOverride = override;
    } else {
      RTCLogError(@"Error overriding output port: %@",
                  error.localizedDescription);
    }
    [session unlockForConfiguration];
  }];
}

- (void)videoCallViewDidEnableStats:(ARDVideoCallView *)view {
  _client.shouldGetStats = YES;
  _videoCallView.statsView.hidden = NO;
}

#pragma mark - RTCAudioSessionDelegate

- (void)audioSession:(RTCAudioSession *)audioSession
    didDetectPlayoutGlitch:(int64_t)totalNumberOfGlitches {
  RTCLog(@"Audio session detected glitch, total: %lld", totalNumberOfGlitches);
}

#pragma mark - Private

- (void)setRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack {
  if (_remoteVideoTrack == remoteVideoTrack) {
    return;
  }
  [_remoteVideoTrack removeRenderer:_videoCallView.remoteVideoView];
  _remoteVideoTrack = nil;
  [_videoCallView.remoteVideoView renderFrame:nil];
  _remoteVideoTrack = remoteVideoTrack;
  [_remoteVideoTrack addRenderer:_videoCallView.remoteVideoView];
}

- (void)hangup {
  self.remoteVideoTrack = nil;
  _videoCallView.localVideoView.captureSession = nil;
  [_captureController stopCapture];
  _captureController = nil;
  [_client disconnect];
  [_delegate viewControllerDidFinish:self];
}

- (NSString *)statusTextForState:(RTCIceConnectionState)state {
  switch (state) {
    case RTCIceConnectionStateNew:
    case RTCIceConnectionStateChecking:
      return @"Connecting...";
    case RTCIceConnectionStateConnected:
    case RTCIceConnectionStateCompleted:
    case RTCIceConnectionStateFailed:
    case RTCIceConnectionStateDisconnected:
    case RTCIceConnectionStateClosed:
    case RTCIceConnectionStateCount:
      return nil;
  }
}

- (void)showAlertWithMessage:(NSString*)message {
  UIAlertController *alert =
      [UIAlertController alertControllerWithTitle:nil
                                          message:message
                                   preferredStyle:UIAlertControllerStyleAlert];

  UIAlertAction *defaultAction = [UIAlertAction actionWithTitle:@"OK"
                                                          style:UIAlertActionStyleDefault
                                                        handler:^(UIAlertAction *action){
                                                        }];

  [alert addAction:defaultAction];
  [self presentViewController:alert animated:YES completion:nil];
}

@end