[Bug 747216] applemedia: implement GstCoreVideoMemory

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747216

--- Comment #11 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
Two more patches:

* applemedia: CMBlockBuffer can be non-contiguous

CMBlockBufferGetDataLength would return the entire data length, while
size of individual blocks can be smaller. Iterate over the block buffer
and add the individual (possibly non-contiguous) memory blocks.

* applemedia: enable sharing of CMBlockBuffer data

Instead of wrapping with GST_MEMORY_FLAG_NO_SHARE, we make the GstMemory
object retain the underlying CMBlockBuffer.

https://github.com/ikonst/gst-plugins-bad/tree/corevideomemory

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