Vonageビデオ通話にiOSのピクチャー・イン・ピクチャーを採用する方法

// *** Fill the following variables using your own Project info  ***

//  ***            https://tokbox.com/account/#/                  ***

// Replace with your OpenTok API key

let kApiKey = ""

// Replace with your generated session ID

let kSessionId = ""

// Replace with your generated token

let kToken = ""

  subscriber = OTSubscriber(stream: stream, delegate: self)

   let videoRender = ExampleVideoRender()
   subscriber?.videoRender = videoRender

NotificationCenter.default.removeObserver(subscriber, name: UIApplication.willResignActiveNotification, object: nil)

let bufferDisplayLayer = videoRender.bufferDisplayLayer

bufferDisplayLayer.frame = frame

videoContainerView.layer.addSublayer(bufferDisplayLayer)

let pixelAttributes: NSDictionary = [kCVPixelBufferIOSurfacePropertiesKey as String: [:]]

var pixelBuffer: CVPixelBuffer?

let result = CVPixelBufferCreate(kCFAllocatorDefault, width, height, kCVPixelFormatType_32BGRA, pixelAttributes as CFDictionary, &pixelBuffer)
         _ = accel.convertFrameVImageYUV(frame, to: pixelBuffer)

func createSampleBufferFrom(pixelBuffer: CVPixelBuffer) -> CMSampleBuffer? {
        CVPixelBufferLockBaseAddress(pixelBuffer, .readOnly)
        
        var sampleBuffer: CMSampleBuffer?
        
        
        let now = CMTimeMakeWithSeconds(CACurrentMediaTime(), preferredTimescale: 1000)
        var timingInfo = CMSampleTimingInfo(duration: CMTimeMakeWithSeconds(1, preferredTimescale: 1000), presentationTimeStamp: now, decodeTimeStamp: now)
        var formatDescription: CMFormatDescription? = nil
        CMVideoFormatDescriptionCreateForImageBuffer(allocator: kCFAllocatorDefault, imageBuffer: pixelBuffer, formatDescriptionOut: &formatDescription)
        
        let osStatus = CMSampleBufferCreateReadyWithImageBuffer(
            allocator: kCFAllocatorDefault,
            imageBuffer: pixelBuffer,
            formatDescription: formatDescription!,
            sampleTiming: &timingInfo,
            sampleBufferOut: &sampleBuffer
        )
        
        if osStatus != noErr {
            let errorMessage = osStatusToString(status: osStatus)
            print("osStatus error: \(errorMessage)")
        }
        
        guard let buffer = sampleBuffer else {
            print("Cannot create sample buffer")
            return nil
        }
        
        CVPixelBufferUnlockBaseAddress(pixelBuffer, [])
        
        return buffer
    }

class SampleBufferVideoCallView: UIView {

    override class var layerClass: AnyClass {

        AVSampleBufferDisplayLayer.self

    }

    var sampleBufferDisplayLayer: AVSampleBufferDisplayLayer {

        layer as! AVSampleBufferDisplayLayer

    }

}

let pipVideoCallViewController = AVPictureInPictureVideoCallViewController()

pipVideoCallViewController.preferredContentSize = CGSize(width: 640, height: 480)  

pipVideoCallViewController.view.addSubview(sampleBufferVideoCallView)

let contentSource = AVPictureInPictureController.ContentSource(

            activeVideoCallSourceView: videoContainerView,

            contentViewController: pipVideoCallViewController)

pipController = AVPictureInPictureController(contentSource: contentSource)   

pipController.canStartPictureInPictureAutomaticallyFromInline = true