Introduce a new configure option --with-gstreamer-api that determines
the desired GStreamer API to use. By default, GStreamer 1.0 is selected.
Also integrate more compatibility glue into gstcompat.h and plugins.
This integrates support for GStreamer API >= 1.0 only in the libgstvaapi
core decoding library. The changes are kept rather minimal here so that
the library retains as little dependency as possible on core GStreamer
functionality.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Use gst_element_class_set_static_metadata() from GStreamer 1.0, which
basically is the same as gst_element_class_set_details_simple() in
GStreamer 0.10 context.
Use newer gst_video_overlay_rectangle_get_pixels_unscaled_raw() helper
function with GStreamer 0.10 compatible semantics, or that tries to
approach the current meaning. Basically, this is also just about moving
the helper to gstcompat.h.
