pub unsafe extern "C" fn heif_mastering_display_colour_volume_decode(
in_: *const heif_mastering_display_colour_volume,
out: *mut heif_decoded_mastering_display_colour_volume
) -> heif_error
pub unsafe extern "C" fn heif_mastering_display_colour_volume_decode(
in_: *const heif_mastering_display_colour_volume,
out: *mut heif_decoded_mastering_display_colour_volume
) -> heif_error