Use 2 lockfree queues so that we can queue and dequeue from different
threads.
Call the process function from the main thread when requested
Rework the data push and pull logic to go through the queues
Update the examples for this new feature, video-play does not need
to schedule the process in the main thread anymore and block for it
to complete, this avoid a deadlock between the data and mainloop when
shutting down.
Add pw_buffer
Add queue/dequeue methods, remove old methods
Add get and set for properties
Update gst elements and examples
Update the API to work branch which is more future proof
Add an argument to pass the result param to the caller instead of
having the caller have to pick it up from the builder.
Improve docs for node, clock and monitor
Pass spa_pod everywhere instead of spa_pod_object.
Pass result argument to spa_pod_filter to make things a little
nicer.
Make enum_params and set_param to configure properties, format
and other parameters. This allows us to remove some duplicate
code and make the properties and parameters much more extensible.
Use the object id to mark the id of the parameter.
Remove the spa_format and spa_props.
We can now make the client-node easier by merging the various
format methods into the params.
Make the stream API more powerful now that we can pass params
around.
The listeners are generally useful in spa, move it there and rename
to hooks. Implement loop hooks with it.
Fix some cleanup issues in stream and remote
Remove signals.
Rename callbacks -> events, use listeners to listen for events.
Callbacks are still used in spa for things you can listen to only
once.
