XVideo is now usable for YUV!

Signed-off-by: Laurent Aimar <fenrir@videolan.org>

No functionnal changes.

Based on an initial patch from Nicolas Chauvet.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Close #2427.

Only libvlc_priv was needed.

It is simply unneeded.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Allocation of U/V planes and unsupported chroma fallback are critically
missing. XvPort grabbing is not implemented. Also, full screen, scale,
zoom, A.R. and crop are missing as with the other XCB plugin.

It has no functionnality changes.

Sorry for the previous one.

(this fix the sort which was buggy).

(and fix a memleak)

Its current value is 0 because of historical reasons. Once all the code
has been reviewed and changed to use BLOCK_TS_INVALID, we can then lower it
to INT64_MIN for example.

Deinterlace plugin seems safe enough to allow its usage, in web plugin
in my case.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

At least a non allocated lock was released.

To crash it:
- Uncheck preference all->Video->Embedded video
- save and exit vlc.
- open VLC
- Open a video file with vlc, turn on visualization.
- ReCheck preferences all->Video->Embedded video and save preferences.
- Press "N" at the keyboard

Close #2486.