Configuring Audio, Video Input and Output devices - iOS 4.x

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// The default initializer will succeed if the front camera is available.
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if let camera = CameraSource(delegate: self),
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    let videoTrack = LocalVideoTrack(source: camera) {
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    // TVIVideoView is a TVIVideoRenderer and can be added to any TVIVideoTrack.
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    let renderer = VideoView(frame: view.bounds)
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    // Add renderer to the video track
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    videoTrack.addRenderer(renderer)
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    self.localVideoTrack = videoTrack
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    self.camera = camera
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    self.view.addSubview(renderer)
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} else {
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    print("Couldn't create CameraSource or LocalVideoTrack")
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}
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// Select between the front and back camera.
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func flipCamera() {
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    var newDevice: AVCaptureDevice?
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    if let camera = self.camera, let captureDevice = camera.device {
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        if captureDevice.position == .front {
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            newDevice = CameraSource.captureDevice(position: .back)
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        } else {
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            newDevice = CameraSource.captureDevice(position: .front)
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        }
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        if let newDevice = newDevice {
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            camera.selectCaptureDevice(newDevice) { (captureDevice, videoFormat, error) in
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                if let error = error {
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                    print("Error selecting capture device.\ncode = \((error as NSError).code) error = \(error.localizedDescription)")
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                }
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            }
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        }
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    }
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}

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// Override the device before creating any Rooms or Tracks.
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self.audioDevice = DefaultAudioDevice()
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TwilioVideoSDK.audioDevice = self.audioDevice
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let localAudioTrack = LocalAudioTrack()
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let connectOptions = ConnectOptions(token: accessToken) { (builder) in
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    builder.roomName = "my-room"
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    if let audioTrack = localAudioTrack {
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        builder.audioTracks = [ audioTrack ]
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    }
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}
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var room = TwilioVideoSDK.connect(options: connectOptions, delegate: self)

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// Change the audio route after connecting to a Room.
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self.audioDevice.block = {
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    do {
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        DefaultAudioDevice.DefaultAVAudioSessionConfigurationBlock()
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        let audioSession = AVAudioSession.sharedInstance()
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        try audioSession.setMode(.voiceChat)
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    } catch let error as NSError {
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        print("Fail: \(error.localizedDescription)")
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    }
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}
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self.audioDevice.block();

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// Change this to `AVAudioSessionOrientationFront` if you wish to use the front microphone.
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NSString *microphone = AVAudioSessionOrientationBack;
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typeof(self) __weak weakSelf = self;
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self.audioDevice.block = ^ {
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    kTVIDefaultAVAudioSessionConfigurationBlock();
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    [weakSelf setMicrophoneInUse:microphone];
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};
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self.audioDevice.block();
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- (void)setMicrophoneInUse:(NSString *)nextDataSource {
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    NSError *theError = nil;
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    BOOL result = YES;
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    AVAudioSession *session = [AVAudioSession sharedInstance];
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    result = [session setActive:YES error:&theError];
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    // Get the set of available inputs. If there are no audio accessories attached, there will be
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    // only one available input -- the built in microphone.
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    NSArray *inputs = [session currentRoute].inputs;
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    // Locate the Port corresponding to the built-in microphone.
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    AVAudioSessionPortDescription *builtInMicPort = nil;
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    for (AVAudioSessionPortDescription *port in inputs) {
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        if ([port.portType isEqualToString:AVAudioSessionPortBuiltInMic]) {
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            builtInMicPort = port;
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            break;
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        }
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    }
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    if ([builtInMicPort.preferredDataSource.orientation isEqualToString:nextDataSource]) {
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        return;
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    }
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    // loop over the built-in mic's data sources and attempt to locate the specified microphone
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    AVAudioSessionDataSourceDescription *theDataSource = nil;
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    for (AVAudioSessionDataSourceDescription *source in builtInMicPort.dataSources) {
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        if ([source.orientation isEqual:nextDataSource]) {
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            theDataSource = source;
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            break;
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        }
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    } // end data source iteration
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    if (theDataSource) {
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        theError = nil;
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        if ([theDataSource.orientation isEqualToString:AVAudioSessionOrientationBack]) {
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            result = [theDataSource setPreferredPolarPattern:AVAudioSessionPolarPatternSubcardioid error:&theError];
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            if (!result) {
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                NSLog (@"Failed to set AVAudioSessionPolarPatternSubcardioid failed");
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            }
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        } else if ([theDataSource.orientation isEqualToString:AVAudioSessionOrientationFront]) {
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            result = [theDataSource setPreferredPolarPattern:AVAudioSessionPolarPatternCardioid error:&theError];
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            if (!result) {
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                NSLog (@"Failed to set AVAudioSessionPolarPatternCardioid failed");
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            }
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        }
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        // Set a preference for the front data source.
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        theError = nil;
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        result = [builtInMicPort setPreferredDataSource:theDataSource error:&theError];
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        if (!result) {
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            // an error occurred. Handle it!
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            NSLog(@"setPreferredDataSource failed");
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        }
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    }
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    // Make sure the built-in mic is selected for input. This will be a no-op if the built-in mic is
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    // already the current input Port.
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    theError = nil;
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    result = [session setPreferredInput:builtInMicPort error:&theError];
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    if (!result) {
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        // an error occurred. Handle it!
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        NSLog(@"setPreferredInput failed");
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    }
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}