将CMSampleBuffer转换为UIImage

问题描述

我正在尝试将sampleBuffer转换为UIImage并将其显示在带有colorspaceGray的图像视图中.但它显示为以下图像.我认为转换存在问题.如何转换CMSampleBuffer?

I am trying to convert sampleBuffer to a UIImage and display it in an image view with colorspaceGray. But it displays as the following image. I think there is a problem regarding the conversion. How can I convert the CMSampleBuffer?

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
    print("buffered")
    let imageBuffer: CVImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!
    CVPixelBufferLockBaseAddress(imageBuffer, CVPixelBufferLockFlags(rawValue: 0))
    let width: Int = CVPixelBufferGetWidth(imageBuffer)
    let height: Int = CVPixelBufferGetHeight(imageBuffer)
    let bytesPerRow: Int = CVPixelBufferGetBytesPerRow(imageBuffer)
    let lumaBuffer = CVPixelBufferGetBaseAddress(imageBuffer)

    //let planeCount : Int = CVPixelBufferGetPlaneCount(imageBuffer)
    let grayColorSpace: CGColorSpace = CGColorSpaceCreateDeviceGray()
    let context: CGContext = CGContext(data: lumaBuffer, width: width, height: height, bitsPerComponent: 8, bytesPerRow: bytesPerRow , space: grayColorSpace, bitmapInfo: CGImageAlphaInfo.none.rawValue)!
    let dstImageFilter: CGImage = context.makeImage()!
    let imageRect : CGRect = CGRect(x: 0, y: 0, width: width, height: height)
    context.draw(dstImageFilter, in: imageRect)
    let image = UIImage(cgImage: dstImageFilter)
    DispatchQueue.main.sync(execute: {() -> Void in
        self.imageTest.image = image
    })
}

推荐答案

转换很简单:

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {

     let imageBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!
     let ciimage : CIImage = CIImage(cvPixelBuffer: imageBuffer)
     let image : UIImage = self.convert(cmage: ciimage)
}

// Convert CIImage to CGImage
func convert(cmage:CIImage) -> UIImage
{
     let context:CIContext = CIContext.init(options: nil)
     let cgImage:CGImage = context.createCGImage(cmage, from: cmage.extent)!
     let image:UIImage = UIImage.init(cgImage: cgImage)
     return image
}

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