swift - CGImage to CVPixelBuffer

Question

如何将CGImage转换为CVPixelBuffer？

我意识到很多问题都是相反的，还有一些客观的C答案，比如这一个，但我无法让他们迅速地工作。这是我最近看到的：

func pixelBufferFromCGImage(image: CGImage) -> CVPixelBuffer {
    var pxbuffer: CVPixelBuffer? = nil
    let options: NSDictionary = [:]

    let width =  image.width
    let height = image.height
    let bytesPerRow = image.bytesPerRow

    let dataFromImageDataProvider = image.dataProvider!.data
    let x = CFDataGetBytePtr(dataFromImageDataProvider)

    CVPixelBufferCreateWithBytes(
        kCFAllocatorDefault,
        width,
        height,
        kCVPixelFormatType_32ARGB,
        CFDataGetBytePtr(dataFromImageDataProvider),
        bytesPerRow,
        nil,
        nil,
        options,
        &pxbuffer
    )
    return pxbuffer!;
}

(这不能编译，因为CVPixelBufferCreateWithBytes例外于UnsafeMutablePointer，CFDataGetBytePtr(dataFromImageDataProvider)是UnsafePointer<UIint8>!)

Answer 1

您需要使用UnsafeMutablePointer，要做到这一点，可以将CFData转换为CFMutableData，然后获取CFData(例如：

let dataFromImageDataProvider = CFDataCreateMutableCopy(kCFAllocatorDefault, 0, image.dataProvider!.data)
let x = CFDataGetMutableBytePtr(dataFromImageDataProvider)