gstreamer1.0-plugins-base: Fix output buffer can't writable after frame_map() issue
-Add GST_VIDEO_FRAME_MAP_FLAG_NO_REF
This makes sure that the buffer is not reffed another time when
storing it in the GstVideoFrame, keeping it writable if it was writable.
-Use new GST_VIDEO_FRAME_MAP_FLAG_NO_REF to replace the old one because it's kind of ugly.
-Don't ref buffers twice when mapping
(From OE-Core master rev:
a618f60675dbcc6568d6b9bdee015456cef78a77)
Signed-off-by: Yuqing Zhu <b54851@freescale.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
