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Any alleged performance benefits gained from the split are purely
mythological and do not justify added code complexity.

A number of compilers, for example those from TI and IBM, choke on
these initialisers.  The current style is also quite ugly.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Martin Storsjö <martin@martin.st>

This reduces code duplication and prevents stale pointers from remaining
on the link.

It is not used in any filters currently and is inherently evil. If
passing binary data to filters is required in the future, it should be
done with some AVOptions-based system.

They are only useful inside filters and we don't allow user filters for
now.

Partially based on a patch by Robert Nagy <ronag89@gmail.com>