从CGImage到CVPixelBuffer的Swift

Question

我有一幅画，像这样：

let image = CGImage(jpegDataProviderSource: dataProvider!,
                   decode: nil, shouldInterpolate: false,
                   intent: CGColorRenderingIntent.defaultIntent)

现在我想把它转换成CVPixelBuffer。

我检查了多个解决方案。看来他们已经过时了。

例如：

let image_cv = pixelBufferFromCGImage(image: <#T##CGImage#>)

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


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

不编译是因为：

Cannot convert value of type 'UnsafePointer<UInt8>?' to expected argument type 'UnsafeMutableRawPointer'

我还尝试使用以下函数：https://github.com/hollance/CoreMLHelpers/blob/master/CoreMLHelpers/CGImage%2BCVPixelBuffer.swift

但我收到：

Value of optional type 'CVPixelBuffer?' (aka 'Optional<CVBuffer>') must be unwrapped to a value of type 'CVPixelBuffer' (aka 'CVBuffer')

我该怎么解决呢？

谢谢

Answer 1

你能试着用变量x替换参数CFDataGetBytePtr(dataFromImageDataProvider)吗？

所以看起来：

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


  CVPixelBufferCreateWithBytes(
      kCFAllocatorDefault,
      width,
      height,
      kCVPixelFormatType_32ARGB,
      x,
      bytesPerRow,
      nil,
      nil,
      options,
      &pxbuffer
  )