I'm working on a very simple App where I need to visualize an image on the screen of an iPhone. However, the image has some special properties. It's a 16bit, yuv422_yuy2 encoded image. I already have all the raw bytes saved in a Data object.
After googling for a long time, I still did not figure out the correct way. My current understanding is first create a CVPixelBuffer to properly represent the encoding information. Then conver the CVPixelBuffer to an UIImage. The following is my current implementation.
public func YUV422YUY2ToUIImage(data: Data, height: Int, width: Int, bytesPerRow: Int) -> UIImage {
return rosImage.data.withUnsafeMutableBytes { rawPointer in
let baseAddress = rawPointer.baseAddress!
let tempBufferPointer = UnsafeMutablePointer<CVPixelBuffer?>.allocate(capacity: 1)
CVPixelBufferCreateWithBytes( kCFAllocatorDefault,
width,
height,
kCVPixelFormatType_422YpCbCr16,
baseAddress,
bytesPerRow,
nil,
nil,
nil,
tempBufferPointer)
let ciImage = CIImage(cvPixelBuffer: tempBufferPointer.pointee!)
return UIImage(ciImage: ciImage)
}
}
However, when I execute the code, I have the followin error
-[CIImage initWithCVPixelBuffer:options:] failed because its pixel format v216 is not supported.
So it seems CIImage is unhappy. I think I need to convert the encoding from yuv422_yuy2 to something like plain ARGB. But after a long tim googling, I didn't find a way to do that. The closest function I cand find is https://developer.apple.com/documentation/accelerate/1533015-vimageconvert_422cbypcryp16toarg
But the function is too complex for me to understand how to use it.
Any help is appreciated. Thank you!