如何从CVPixelBuffer创建CGImage？

Question

我有一个从CVPixelBuffer创建CGImage的简单函数

if let buffer = (results as? [VNPixelBufferObservation])?.first {
    let pixelBuffer = buffer.pixelBuffer
    let ciImage = CIImage(cvPixelBuffer: pixelBuffer)
    let resultImage = UIImage(ciImage: ciImage)
    return resultImage.cgImage //returns nil
}

但它返回nil。为什么？

Answer 1

试试这个

import VideoToolbox
func createImage(from pixelBuffer: CVPixelBuffer) -> CGImage? {
    var cgImage: CGImage?
    VTCreateCGImageFromCVPixelBuffer(pixelBuffer, options: nil, imageOut: &cgImage)
    return cgImage
}