Anton Khirnov 2e956d9c0f lavc/container_fifo: move to lavu and make public ...

This can be useful in other places, e.g. it can replace objpool in
fftools.

The API is modified in the following nontrivial ways:
* opaque pointers can be passed through to all user callbacks
* read and write were previously separate callbacks in order to
  accomodate the caller wishing to write a new reference to the FIFO and
  keep the original one; the two callbacks are now merged into one, and
  a flags argument is added that allows to request such behaviour on a
  per-call basis
* new peek and drain functions

2024-12-15 14:05:15 +01:00

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