[Bug 740222] libav: Video decoder push buffer mapped in READ/WRITE

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740222
  GStreamer | gst-libav | 1.4.4

--- Comment #14 from Wim Taymans <wim.taymans at gmail.com> 2014-11-24 12:26:06 UTC ---
We could add a remap function to memory and buffer with a relock function in
miniobject or we could add a new GST_LOCK_RELOCK flag. I don't think there is
much advantage to a flag, adding api seems more in line with mremap(2).

At the minobject level, it would probably atomically flip some bits when the
shared count is 1 (otherwise it would act like map, and fail when asking to
relock something that you don't own, with less privileges)

After relocking, the default implementation of the new remap function would
unmap and map. You would have to implement something in the allocators that can
do something smarter.

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