Create a CVPixelBuffer from a CIImage

createPixelBufferFromCIImage.swift

// Usage - CVImageBuffer and CVPixelBuffer are the same types
let pixelBuffer: CVImageBuffer? = createPixelBufferFrom(image: image)

// How CIContext was declared - used in a MTKView class
device = MTLCreateSystemDefaultDevice()
framebufferOnly = false
colorPixelFormat = .bgra8Unorm
commandQueue = device!.makeCommandQueue()
Config.shared.ciContext = CIContext(mtlDevice: self.device!)

// Function
func createPixelBufferFrom(image: CIImage) -> CVPixelBuffer? {
    // based on https://stackoverflow.com/questions/54354138/how-can-you-make-a-cvpixelbuffer-directly-from-a-ciimage-instead-of-a-uiimage-in
    
    let attrs = [
      kCVPixelBufferCGImageCompatibilityKey: false,
      kCVPixelBufferCGBitmapContextCompatibilityKey: false,
      kCVPixelBufferWidthKey: Int(image.extent.width),
      kCVPixelBufferHeightKey: Int(image.extent.height)
    ] as CFDictionary
    var pixelBuffer : CVPixelBuffer?
    let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(image.extent.width), Int(image.extent.height), kCVPixelFormatType_32BGRA, attrs, &pixelBuffer)
  
    if status == kCVReturnInvalidPixelFormat {
      print("status == kCVReturnInvalidPixelFormat")
    }
    if status == kCVReturnInvalidSize {
      print("status == kCVReturnInvalidSize")
    }
    if status == kCVReturnPixelBufferNotMetalCompatible {
      print("status == kCVReturnPixelBufferNotMetalCompatible")
    }
    if status == kCVReturnPixelBufferNotOpenGLCompatible {
      print("status == kCVReturnPixelBufferNotOpenGLCompatible")
    }
    
    guard (status == kCVReturnSuccess) else {
      return nil
    }
  
    Config.shared.ciContext?.render(image, to: pixelBuffer!)
    return pixelBuffer
  }

I took much CPU and make app run slow, do you have another solution?

Hey @fukemy I ended up using MetalPetal. It dropped the CPU from 120+ to just above 60. https://github.com/MetalPetal/MetalPetal

nice, I will look on this, thanks so much