AVMetadataIdentifierID3MetadataRelativeVolumeAdjustment

objc2_av_foundation

Static AVMetadataIdentifierID3MetadataRelativeVolumeAdjustment 

Source 
pub unsafe static AVMetadataIdentifierID3MetadataRelativeVolumeAdjustment: Option<&'static AVMetadataIdentifier>
Available on crate feature AVMetadataIdentifiers only.
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Apple’s documentation