[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

Wim Taymans <wim.taymans> changed:

           What    |Removed                     |Added
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                 CC|                            |wim.taymans at gmail.com

--- Comment #3 from Wim Taymans <wim.taymans at gmail.com> 2013-07-16 15:01:53 UTC ---
(In reply to comment #2)
> (In reply to comment #0)
> 
> > GstBuffer layer. Add a flag to notify the GstMemory handlers that on
> > GST_MAP_READWRITE, we are going to effectively read from the buffer, prior to
> > writing to it. e.g. GST_MAP_READ_FIRST. In this case, GST_MAP_READWRITE could
> > mean read for "intermediate" operations to the caller and next write/commit on
> > un-map.
> 
> Sounds like a good idea IMHO :)

I think READ_FIRST should be the default, I think elements that map RW expect
to be able to read valid data before writing.

So, I would make WRITE_FIRST as an option and then I would go and add that flag
to where it matters.

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