[Bug 704083] Improve GstBuffer/GstVideoFrame mappings for HW surfaces

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704083
  GStreamer | don't know | git

--- Comment #5 from Gwenole Beauchesne <gb.devel at gmail.com> 2013-07-17 08:47:47 UTC ---
Yes, the idea is to notify the GstMemory implementation that we are going to
write over the mapped buffer, and we don't care about the existing contents.
So, the flag probably could be named GST_MAP_REWRITE or something more
meaningful you may find. Though, GST_MAP_WRITE_FIRST looks good too. :)

The other idea with the dirty rectangle thing that could be useful is if we
have a local storage/cache in the local buffer (VDPAU). That way, we probably
could download only the useful region we care about. On the other hand, for
decoding purposes, we only care about modifying the whole frame IMHO.

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