[Bug 759358] Add GST_CAPS_FEATURE_MEMORY_DMABUF "memory:DMABuf"

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759358

--- Comment #12 from Julien Isorce <julien.isorce at gmail.com> ---
(In reply to Benjamin Gaignard from comment #11)
> Even if a fd has been secure you can mmap it but the CPU will read only 0
> and write requests will be ignore.

Hi Benjamin, could you precise "will read 0" ? So mmap will return NULL but not
MAP_FAILED (i.e. (void *) -1 ) ? What does it mean that write requests will be
ignore if the data is NULL in the first place ? Thx :)

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