Function CMAudioFormatDescriptionCreate 

pub unsafe extern "C" fn CMAudioFormatDescriptionCreate(
    allocator: CFAllocatorRef,
    asbd: *const AudioStreamBasicDescription,
    layoutSize: usize,
    layout: *const AudioChannelLayout,
    magicCookieSize: usize,
    magicCookie: *const c_void,
    extensions: CFDictionaryRef,
    formatDescriptionOut: *mut CMAudioFormatDescriptionRef,
) -> OSStatus

Apple SDK function CMAudioFormatDescriptionCreate.