[Bug 785054] if downstream doesn't support GstVideoMeta, VAAPI has to copy to another buffer and convert the stride

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785054

--- Comment #8 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 368643
  --> https://bugzilla.gnome.org/attachment.cgi?id=368643&action=edit
vaapipostproc: handle system allocated buffers when required

When downstream can't handle GstVideoMeta it is required to send
system allocated buffers.

The system allocated buffers are produced in prepare_output_buffer()
vmethod if downstream can't handl GstVideoMeta.

At transform() vmethod if the buffer is a system allocated buffer,
a VA buffer is instanciated and replaces the out buffer. Later
the VA buffer is copied to the system allocate buffer and it
replaces the output buffer.

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