ximagesink and xvimagesink use XkbKeycodeToKeysym when the key event is
received. However, this function returns NoSymbol if Xkb is unavailable.
This causes all key events to be translated to "unknown" key when running
ximagsink under some VNC.
Fix it by using XKeycodeToKeysym if Xkb is unavailable.
Don't try to set port attribute that's not advertised by the
adaptor. Fixes videotestsrc ! xvimagesink aborting with
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 151 (XVideo)
Minor opcode of failed request: 13 ()
on intel HD4600 graphics with kernel 3.16, xserver 1.15,
intel driver 2.21.15.
Make a new refcounted xvcontext object that handles the X connection.
Use the xvcontext to allocate images and windows. Move some code
around so that all X calls are made from the xvcontext object.
Make a GstXvImageAllocator object that allocates images from the xvcontext. We
can implement a copy function now for these memory objects now.
Make the bufferpool use the xvimageallocator object for its images.
