iOS：将UIImage转换为CMSampleBuffer

Question

有些问题涉及如何将CMSampleBuffer转换为UIImage，但没有关于如何进行反向的答案，即将UIImage转换为CMSampleBuffer。

这个问题与类似问题不同，因为下面的代码提供了将UIImage转换为CVPixelBuffer的起点，希望有更多AVFoundation专业知识的人可以帮助修复转换为CMSampleBuffer。

func convertImageToBuffer(from image: UIImage) -> CVPixelBuffer? {
    let attrs = [
        String(kCVPixelBufferCGImageCompatibilityKey) : kCFBooleanTrue,
        String(kCVPixelBufferCGBitmapContextCompatibilityKey) : kCFBooleanTrue
        ] as [String : Any]
    var buffer : CVPixelBuffer?
    let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(image.size.width), Int(image.size.height), kCVPixelFormatType_32ARGB, attrs as CFDictionary, &buffer)
    guard (status == kCVReturnSuccess) else {
        return nil
    }

    CVPixelBufferLockBaseAddress(buffer!, CVPixelBufferLockFlags(rawValue: 0))
    let pixelData = CVPixelBufferGetBaseAddress(buffer!)

    let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
    let context = CGContext(data: pixelData, width: Int(image.size.width), height: Int(image.size.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(buffer!), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.noneSkipFirst.rawValue)

    context?.translateBy(x: 0, y: image.size.height)
    context?.scaleBy(x: 1.0, y: -1.0)

    UIGraphicsPushContext(context!)
    image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
    UIGraphicsPopContext()
    CVPixelBufferUnlockBaseAddress(buffer!, CVPixelBufferLockFlags(rawValue: 0))

    return buffer
}