[Bug 747707] applemedia: expose GstCoreMediaMeta to app

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747707

--- Comment #2 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
As discussed on IRC, GstCoreVideoMemory should not be the only kind of object
retaining the Apple objects -- since:

  a) there are multiple GstCoreVideoMemory for planes -- which one you look
into?

  b) when passing a CMSampleBuffer / CVPixelBuffer between supporting elements
(determined via meta feature-caps), we can avoid populating the GstBuffer with
GstCoreVideoMemory objects at all


We might unify the metas, possibly keeping a variant of GstCoreMediaMeta whose
sample_buf can be NULL?

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