kCMSampleAttachmentKey_HEVCStepwiseTemporalSubLayerAccess

objc2_core_media

Static kCMSampleAttachmentKey_HEVCStepwiseTemporalSubLayerAccess 

Source 
pub unsafe static kCMSampleAttachmentKey_HEVCStepwiseTemporalSubLayerAccess: &'static CFString
Available on crate feature CMSampleBuffer only.
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Apple’s documentation