[Bug 712754] v4l2: add support for multi-planar V4L2 API

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=712754
  GStreamer | gst-plugins-good | git

Julien Isorce <julien.isorce> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #34 from Julien Isorce <julien.isorce at gmail.com> 2013-12-04 09:31:25 UTC ---
commit 3c70741e45da94e76b7015c367857312861886ba
Author: Julien Isorce <julien.isorce at collabora.co.uk>
Date:   Thu Nov 21 12:29:28 2013 +0000

    v4l2bufferpool: add support for multi-planar V4l2 API in DMABUF mode

    Fixes bug https://bugzilla.gnome.org/show_bug.cgi?id=712754

commit 303cec48db41f6e1ac422ac4faf979a26b51d277
Author: Julien Isorce <julien.isorce at collabora.co.uk>
Date:   Tue Nov 19 17:16:27 2013 +0000

    v4l2: refactor by emulating one v4l2_plane in non-MPLANE mode

    so that the buffer informations can be retrieved the same way
    in both MPLANE and non-MPLANE mode.

    Here "emulating" means "manually fill in the plane".

    Fixes bug https://bugzilla.gnome.org/show_bug.cgi?id=712754

commit 61ae84b50dc319a53b513e5474c1578d7127c67c
Author: Julien Isorce <julien.isorce at collabora.co.uk>
Date:   Wed Nov 13 12:05:40 2013 +0000

    v4l2: add support for multi-planar V4L2 API

    This api is in linux kernel since version 2.6.39,
    and present in all version 3.

    The commit that adds the API in master branch of the
    linux kernel source is:
   
https://github.com/torvalds/linux/commit/f8f3914cf922f5f9e1d60e9e10f6fb92742907ad

    v4l2 doc: "Some devices require data for each input
    or output video frame to be placed in discontiguous
    memory buffers"

    There are newer structures 'struct v4l2_pix_format_mplane'
    and 'struct v4l2_plane'.
    So the pixel format is not setup with the same API when using
    multi-planar.

    Also for gst-v4l2, one of the difference is that in GstV4l2Meta
    there are now one mem pointer for each maped plane.

    When not using multi-planar, this commit takes care of keeping
    the same code path than previously. So that the 2 cases are
    in two different blocks triggered from V4L2_TYPE_IS_MULTIPLANAR.

    Fixes bug https://bugzilla.gnome.org/show_bug.cgi?id=712754

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