[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 #12 from Wim Taymans <wim.taymans at gmail.com> 2014-11-24 11:41:46 UTC ---
(In reply to comment #11)
> Why can't we just demote the READ|WRITE map to a READ map and then forward that
> downstream?

We can unmap READ|WRITE and then map READ. The only concern is that in a
multithreaded decoder, this can't be safe. Therefore we need an atomic remap
call.

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