问题描述
CMPixelFormatType常量是 CVPixelFormatType常量.
此外，在CMPixelFormatType注释中，它表示:
Additionally, in the CMPixelFormatType comments, it says:
这两组常数有什么区别?为什么CMPixelFormatType常量只是CVPixelFormatType常量的子集?他们有特色吗?
What’s the difference between these two groups of constants? Why are the CMPixelFormatType constants only a subset of the CVPixelFormatType constants? Are they special?
推荐答案
更新:不，kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange(未在CMPixelFormatType中定义)也受支持.
Update: Nope, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange (not defined in CMPixelFormatType) is also supported.
我的猜测是CMPixelFormatType定义的像素格式的子集是macOS/iOS中实际支持的像素格式，而CVPixelFormatType定义的像素格式是世界上所有已知的像素格式.
My guess is that the subset of pixel formats defined by CMPixelFormatType are the ones that are actually supported in macOS/iOS whereas the pixel formats defined by CVPixelFormatType are all the known pixel formats in the world.
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