avcodec/packet: add generic side data helpers

Handling AVPacketSideData directly, which can used on structs other than
AVPacket.
This will be useful in the following commits.

Signed-off-by: James Almer <jamrial@gmail.com>
pull/390/head
James Almer 2 years ago
parent f62c441e7a
commit 74279227dd
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