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parse_nth_allocation_pool() give a ref on the pool, we need to unref it
when done.

This can be enabled sing io-mode=dmabuf. This will enabled mmap base
drivers to export the buffers as dmabuf.

Because of the buf in videobuf2, dqbuf may leave the DONE flag being,
which would implied that the buffer is queued. As this has been broken
for 4 years, simply guaranty the state flags integrity when doing
qbuf/dqbuf.

See https://patchwork.linuxtv.org/patch/23641/

In set_caps, now checks if caps actually changed and succeed if they didn't
change.

Improve decide allocation so it properly configure both local and downstream
buffer pools. Also read back the pool config if it was changed to to driver
limitations.

Pre-configuring the pool is error prone, since it may hide a configuration failure and
endup with a pool that is not configured the way it should (e.g. no video meta, wrong
queue size, etc.)

Turn crop meta into a custom option and make sure it's there is needed.

Catch short allocation after saving the format. This is not a catch all, but should catch
most of the miss-behaving drivers when doing S_FMT/G_FMT and avoid potential crash.

This goal of this allocator is mainly to allow tracking the memory.
Currently, when a buffer memory has been modified, the buffer and it's
memory is disposed and lost until the stream is restarted.

Currently we advertise crop meta, but not element handle support this meta.

Some well known decoder wrongly set num_planes to 0 in their format instead of
one. In this case we would endup with no size when deciding buffer allocation.

All the element requires at least two buffers. This is not used for RW mode.

This should remove 1 copy between the decoder and the transform.

That pool may be different then the internal pool.

Implement a v4l2 element that wraps HW video converters.

In order to correctly set the pool min/max, we need to probe for CREATE_BUFS
ioctl. This can be done as soon as the format has been negotiated using a
count of 0.