[Bug 583890] v4l2: Implement V4L2_MEMORY_USERPTR support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=583890
  GStreamer | gst-plugins-good | git

--- Comment #47 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-01-07 09:02:48 UTC ---
(In reply to comment #46)
> When entering "gst_v4l2_buffer_pool_process" the incoming buffer must have a
> reference counter equal to 1 to be writable. (Calling gst_buffer_make_writable
> is not useful here as it would make a copy)
I agree.

> For some reasons here the v4l2videodecoder always gives me a buffer with
> refcount equal to 2 (but I already have the meta so no pb) but maybe with
> omxdecoder it will be 1.
The incoming buffer has also a refcount of 2. I will try to understand why.

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