[Bug 768794] ion: DMA Buf allocator based on ion

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768794

--- Comment #3 from kevin <kevinbing.song at gmail.com> ---
Will fix coding style issue.

GLdownloadelement can propose one GL buffer pool to upstream. The GL buffer
pool allocate DMA FD memory from ION allocator. and than create one EGL image
from DMA FD. So upstream can use GL buffer and downstream can use fd memory.

Suppose GLupload also can propose GL buffer pool and dma-buf memory to avoid
video copy. Is it reasonable?

ion.h is sufficient for build. ion device open will fail when use the ion
allocator if platform haven't ion driver.

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