tree c659ba2472ca8f02ce0a858b1c65cd6b6d37cc15
parent 8ab9b3ee5ae974dccbf30d85b6d3c4bfe9ff4709
author Jonas Larsson <ljonas@google.com> 1579723193 -0800
committer Jonas Larsson <ljonas@google.com> 1579913548 -0800

gldownloadelement: fix downloading of 'RGBA' EGLImages

NXP has broken basic standard use like
source ! glupload ! glcolorconvert ! gldownload ! video/x-raw,format=RGBA ! sink
in their fork. In this pipeline, if source produces dmabufs, the
pipeline output is always just black. That's because the dmabuf wrapped
EGLImage marked as RGBA is never drawn. glcolorconvert will pass through
of same RGBA caps but the buffer isn't RGBA in traditional GStreamer
sense, it can simply just be sampled as a RGBA texture by hardware when
drawing.

Detect this situation and force drawing to an actual RGBA texture that
can be efficiently downloaded. This restores standard GStreamer
behavior.

BUG: 148157331

Change-Id: I229efde22f49d9540c85b38923dbea4d4eb257bc