This is for readability and better control.
Make sure we clear out all pointers to anything related to the released
pw_buffer, including all the memories.
Many Gstreamer elements support transforming buffers via the
`image-orientation` tag. Use it to implement support for the new
VideoTransform meta.
In order for Gstreamer pipelines to enable support for these tags
usually the rotate method has to be set to `auto` or `automatic`,
e.g. `videoflip method=automatic`, `glimagesink rotate-method=automatic`
or `waylandsink rotate-method=auto`.
Pipewire might update buffers that have not been recycled by GStreamer,
because they are still used downstream. There is nothing we can do about
it in the pipewiresrc.
If a buffer is sent downstream more than once, take an additional
reference to make sure that we don't queue a buffer that is still used
and print a warning.
Simplify the stream API. make just 2 methods to queue and dequeue
buffers. Make just one callback when new buffers can be dequeued.
Add support for driver nodes such as the video-src.
Pass a pw_buffer structure to add/remove_buffer and make it possible
to attach metadata to it. This makes it a lot easier to implement
the gstreamer pipewire pool.
Call the stream process function from the main loop and use a lockfree
ringbuffer to pass buffers between the threads. Make it possible to
also call process from the RT thread.
unmap the buffer data when needed.
