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我正在尝试使用 Swift 3.0 将 a 转换为CMSampleBuffera UIImage。一种流行的解决方案是为CMSampleBuffer该类编写一个扩展并添加一个 getter 以将缓冲区转换为图像。这是它的样子：

import Foundation
import AVFoundation

extension CMSampleBuffer {
    @available(iOS 9.0, *)
    var uiImage: UIImage? {
    guard let imageBuffer = CMSampleBufferGetImageBuffer(self) else { return nil }

    let ciimage: CIImage = CIImage(cvImageBuffer: imageBuffer)


    let image:UIImage = UIImage(ciImage: ciimage)


    return image
    }

}

它工作正常，但占用了大量内存，占应用程序总内存的 40%。有没有更高效的内存解决方案？

编辑：

我已经更改了我的代码，它看起来像这样：

var uiImage: UIImage? {
    guard let imageBuffer = CMSampleBufferGetImageBuffer(self) else { return nil }

    CVPixelBufferLockBaseAddress(imageBuffer, CVPixelBufferLockFlags(rawValue: 0))
    let baseAddress = CVPixelBufferGetBaseAddress(imageBuffer)
    let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer)
    let width = CVPixelBufferGetWidth(imageBuffer)
    let height = CVPixelBufferGetHeight(imageBuffer)
    let colorSpace = CGColorSpaceCreateDeviceRGB()
    let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.noneSkipFirst.rawValue | CGBitmapInfo.byteOrder32Little.rawValue)


    var image: UIImage?
    autoreleasepool(invoking: {() -> () in
        guard let context = CGContext(data: baseAddress,
        width: width,
        height: height,
        bitsPerComponent: 8,
        bytesPerRow: bytesPerRow,
        space: colorSpace,
        bitmapInfo: bitmapInfo.rawValue) else { return }
        guard let cgImage = context.makeImage() else { return }
        image = UIImage(cgImage: cgImage)
    })    
    CVPixelBufferUnlockBaseAddress(imageBuffer,CVPixelBufferLockFlags(rawValue: 0));



    return image
}

内存泄漏与 CGContext 有关。除了使用自动释放池之外，还有其他方法可以释放/释放/释放它吗？

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