What is the precise function of CVBufferSetAttachment?

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CVBufferSetAttachment is a function in the Core Video framework that is used to attach metadata to a CVBuffer. The function allows the user to add custom key-value pairs to the buffer, which can help identify or describe the contents of the buffer. This metadata can include information about the color space, frame rate, format, or any other relevant details about the buffer. The function is specifically designed for use with Core Video Buffers, which are used to store video and image data in macOS and iOS. In summary, CVBufferSetAttachment is used to add custom metadata to a Core Video Buffer.