waylandsink: handling y-flipped dmabuf

Submitted by Shinya Saito

Description

Created attachment 347525
add y-flip flag for dmabuf

By default, waylandsink does not set the y-flip flag on wl_buffers backed by dmabufs. Depending on the dmabuf source, this can cause the image to be displayed upside down.

In the patch, a y-flip property is added to waylandsink, but I don't know if this is the best way. Maybe the Gstbuffer should hold the information of y-flip, but I
am not sure.

Patch 347525, "add y-flip flag for dmabuf":
0001-waylandsink-Add-y-inverted-option-for-dmabuf.patch

Version: 1.11.1