Ggtcf

I want to build my own depth map and save image like portrait photo with depth info. So first of all I need generate AVDepthData. After dig how it builded, I try to reproduce it:

func buildDepth() 
 // ...
 let info: [AnyHashable: Any] = [kCGImagePropertyPixelFormat: kCVPixelFormatType_DisparityFloat32,
 kCGImagePropertyWidth: width,
 kCGImagePropertyHeight: height,
 kCGImagePropertyBytesPerRow: bytesPerRow]
 let metadata = generateMetadata(photo: photo)
 let dic: [AnyHashable: Any] = [kCGImageAuxiliaryDataInfoDataDescription: info,
 kCGImageAuxiliaryDataInfoData: data,
 kCGImageAuxiliaryDataInfoMetadata: metadata]
 guard let depthData = try? AVDepthData(fromDictionaryRepresentation: dic) else 
 return false
 
 print(depthData.cameraCalibrationData) // <----- prints nil


private static func generateMetadata(photo: Photo) -> CGImageMetadata 
 let metadata = CGImageMetadataCreateMutable()

 let fxy = max(photo.orig.size.width, photo.orig.size.height)
 let cx = photo.orig.size.width/2
 let cy = photo.orig.size.height/2

 addMetadataTag(metadata, key: "Filtered", value: true)
 addMetadataTag(metadata, key: "Quality", value: "high")
 addMetadataTag(metadata, key: "Accuracy", value: "relative")
 addMetadataTag(metadata, key: "DepthDataVersion", value: 65538)
 addMetadataTag(metadata, key: "PixelSize", value: 0.001000)


 addMetadataTag(metadata, key: "LensDistortionCoefficients", value: [0,0,0,0,0,0,0,0])
 addMetadataTag(metadata, key: "InverseLensDistortionCoefficients", value: [0,0,0,0,0,0,0,0])


 addMetadataTag(metadata, key: "IntrinsicMatrixReferenceWidth", value: photo.orig.size.width)
 addMetadataTag(metadata, key: "IntrinsicMatrixReferenceHeight", value: photo.orig.size.height)
 addMetadataTag(metadata, key: "LensDistortionCenterOffsetX", value: cx)
 addMetadataTag(metadata, key: "LensDistortionCenterOffsetY", value: cy)
 addMetadataTag(metadata, key: "ExtrinsicMatrix", value: [1,0,0,
 0,1,0,
 0,0,1,
 0,0,0])

 addMetadataTag(metadata, key: "IntrinsicMatrix", value: [fxy,0,0,
 0,fxy,0,
 cx,cy,1])

 addMetadataTag(metadata, type: .depthBlur, key: "SimulatedAperture", value: 4.5)
 addMetadataTag(metadata, type: .depthBlur, key: "RenderingParameters", value: "UkVORAEAAAAwAAAAAgAAAJqZmT4K1yM8F0iSOTVeuj0zM7M/DdXOOwAAAD+amRk+")
 print(metadata)
 return metadata


enum MetadataType 
 case depth, depthBlur


@discardableResult private static func addMetadataTag(_ metadata: CGMutableImageMetadata, type: MetadataType = .depth, key: String, value: Any) -> Bool 
 let namespace: String
 let prefix: String
 switch type 
 case .depth:
 namespace = "http://ns.apple.com/depthData/1.0/"
 prefix = "depthData"
 case .depthBlur:
 namespace = "http://ns.apple.com/depthBlurEffect/1.0/"
 prefix = "depthBlurEffect"
 
 guard let metadataTag = CGImageMetadataTagCreate(namespace as CFString, prefix as CFString, key as CFString, .default, value as CFTypeRef)
 else return false 

 print("type", CGImageMetadataTagGetType(metadataTag).rawValue)
 return CGImageMetadataSetTagWithPath(metadata, nil, ("xmp:"+key) as CFString, metadataTag)

After this I get AVDepthData witch I can save into image. But this data not contains any additional info like cameraCalibrationData. Dictionary generated by system looks similar to my dictionary.