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Make dataflow happen.

More miniobject fixing, leaks horribly somewhere..

More minionject stuff.

More work on making miniobject a simple allocated struct.

First attempt at making miniobject a simple boxed type.

Fix padding, remove deprecated symbols.

https://bugzilla.gnome.org/show_bug.cgi?id=642869

This was required to add a new MEDIA4 buffer flag for indicating
progressive/mixed telecine video buffers. There is no space for
additional flags in GstBuffer, so steal one from GstMiniObject.

https://bugzilla.gnome.org/show_bug.cgi?id=642671

This commit changes the request pad behaviour for plugins and applications.

Reopens Bug #402562

The proper fix for that bug is to keep track of created request pads.

This reverts commit a5e44fff.

Fixes #636011 and #402562.

Also do some cleanup in the impl.

.. since we sadly have a plugin in -good that has a uchar property
(cmmlenc)

https://bugzilla.gnome.org/show_bug.cgi?id=642522

atomicqueue: fix include order# Please enter the commit message for your changes. Lines starting

Use new GstPoll functionality to wakeup the mainloop.
Use an atomic queue on the writer side to post the messages.
The reader side it protected with the lock still because we don't want multiple
concurrent readers.

Add an atomic queue. The queue can be used from multiple threads simultaneously
and without taking any locks or doing any blocking operations. This makes it
highly scalable for things like the bus, bufferpools and object recycling.

Add a timeout member to the progress messages to let the application know about
the timeout so that it can do some gui things with it.

We need to ensure we call gst_pad_check_link() with the two pads in the correct
order. The order depends on wheter we iterate src or sink pads.
Signed-off-by: Chen Rui <rui.chen@tieto.com>

Check the sinkpad for the flushing state before calling the chainfunction on the
pad. We do this by checking the cache (which is also cleared on the srcpad when
the sink is set to flushing).

Fixes #641928

It was comparing the length with itself.

Fixes #642071.

Add a parameter to the QoS event to specify the QoS event type.
Update docs and add unit test.

See #638891