iPhoneアプリ開発に関して、メモリがどんどん増えていく

###前提・実現したいこと
AVCaptureの画像をCMSampleBufferの状態から一度画像へ変換し、その画像を一度rawdata?に戻したものを画像へ変換する。（rawdata部分で加工処理をする想定）

###発生している問題・エラーメッセージ

このときに、メモリの増加が止まらない。

###該当のソースコード

class CameraUtil2: NSObject {
    class func imageFromSampleBuffer(_ sampleBuffer:CMSampleBuffer) -> UIImage{
        
        let imageBuffer:CVImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!
        CVPixelBufferLockBaseAddress(imageBuffer, CVPixelBufferLockFlags(rawValue: CVOptionFlags(0)))
        
        var baseAddress:UnsafeMutableRawPointer = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0)!
        let bytesPerRow:Int = CVPixelBufferGetBytesPerRow(imageBuffer)
        let width:Int = CVPixelBufferGetWidth(imageBuffer)
        let height:Int = CVPixelBufferGetHeight(imageBuffer)
        let colorSpace:CGColorSpace = CGColorSpaceCreateDeviceRGB()
        let newContext:CGContext = CGContext(data: baseAddress, width: width, height: height, bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: colorSpace,  bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue|CGBitmapInfo.byteOrder32Little.rawValue)!
        let imageRef:CGImage = newContext.makeImage()!
        let resultImage = UIImage(cgImage: imageRef, scale: 1.0, orientation: UIImageOrientation.right)
 
        let image = resultImage
    
        var editedimage:UIImage
        let width2 :Int = Int((image.cgImage!.width))
        let height2 :Int = Int((image.cgImage!.height))
        let imageData = image.cgImage!.dataProvider!.data //cgimageのデータ
        let datalenght = CFDataGetLength(imageData)
  
        var rawData : UnsafeMutablePointer<UInt8>
        rawData = UnsafeMutablePointer<UInt8>.allocate(capacity: datalenght)
        let provider = CGDataProvider(dataInfo: nil,data: rawData, size: datalenght,releaseData: releaseData)

        let colorSpaceRef = image.cgImage!.colorSpace
        let bitmapInfo =  CGBitmapInfo(rawValue: CGImageAlphaInfo.first.rawValue)
        let bitsPerComponent:Int =  image.cgImage!.bitsPerComponent
        let bitsPerPixel = image.cgImage!.bitsPerPixel
        let bytesPerRow2 = image.cgImage!.bytesPerRow
        let cgImage = CGImage(width: width2, height: height2, bitsPerComponent: bitsPerComponent, bitsPerPixel: bitsPerPixel, bytesPerRow:bytesPerRow2, space: colorSpaceRef!, bitmapInfo: bitmapInfo, provider: provider!, decode: nil, shouldInterpolate: false, intent: .defaultIntent)
        editedimage = UIImage(cgImage:cgImage!, scale:image.scale, orientation:image.imageOrientation)
        return editedimage
    }
    
    static let releaseData: CGDataProviderReleaseDataCallback = { (info: UnsafeMutableRawPointer?, data: UnsafeRawPointer, size: Int) -> () in
      //  print("callback")
        return
    }