unsafe extern "C" fn alloc<T: AllocatorImpl>(
ptr: *mut GstAllocator,
size: usize,
params: *mut GstAllocationParams,
) -> *mut GstMemory
unsafe extern "C" fn alloc<T: AllocatorImpl>(
ptr: *mut GstAllocator,
size: usize,
params: *mut GstAllocationParams,
) -> *mut GstMemory