tree 49edb018d5c76d075c573fc1d54114be2e4186da
parent a7e25299305c511a4d202fe83b548f65adbf5eb7
author Jonas Larsson <ljonas@google.com> 1570558881 -0700
committer Jonas Larsson <ljonas@google.com> 1570558978 -0700

Fix compatibility with glvideoflip

glsvgoverlaysink doesn't yet support affine transformations (there's a TODO).
But since the wrapped glimagesink advertises support via the ALLOCATION
query upstream elements such as glvideoflip doesn't actually flip buffers,
instead it just sets an affine transformation meta matrix that gets ignored.

To be able to support hflip and vflip as required by some demos, remove the
advertised support from ALLOCATION query so it matches this sink's actual
capabilities, and support basic flipping via fixed matrices.

Matrices and vertex shaders are the same ones that glimagesink uses,
and values for 'rotate-method' is part of GStreamer's stable API.

Change-Id: If1b62e3dc3a093e20ca6fd6b382589c3f192adcc