CMPixelFormatType和CVPixelFormatType之间的区别? [英] Difference between `CMPixelFormatType` and `CVPixelFormatType`?

问题描述

CMPixelFormatType常量是此外，在CMPixelFormatType注释中，它表示:

Additionally, in the CMPixelFormatType comments, it says:

通常，也可以使用CoreVideo CVPixelFormatType常量.

In general, CoreVideo CVPixelFormatType constants may be used too.

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.

像素格式标识符文档:

Core Video不支持所有这些格式.该列表仅定义了它们的名称.

Core Video does not provide support for all of these formats; this list defines only their names.

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