[FFmpeg-devel] [RFC] [PATCH 1/5] hwcontext: add a new AVHWFramesContext.opaque field

[Lynne]

This is a public field, settable before frames context initialization,
and propagated to any derived contexts.

API users can use it to store state and determine which context
is one of theirs.

This also allows decoders which create their own contexts to store
some state which would be freed only at context destruction.

Request for comments.

Patch attached.

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