tree 5abee9cea671a437b929b53f7a712a74a4957806
parent 0497355e3c5409137a591d59211e4b48cca99cef
author Jonas Larsson <ljonas@google.com> 1604708706 -0800
committer Jonas Larsson <ljonas@google.com> 1604709410 -0800

Add generic glsvgoverlay element

glsvgoverlay is similar to the old glsvgoverlaysink but is a
filter instead of a sink. That means that the overlays are
rendered on the frame and passed downstream instead of overlays
being drawn on top of the frame in the sink. This enables passing
the output to e.g. a video encoder and not just HDMI.

Two modes are supported set by the bool property 'sync'. When
true the element will require a SVG overlay with the same PTS
(presentation timestamp) as the frame; no incoming video frame
will be rendered without the corresponding overlay. The sync
property set to false means the element will draw the last
available SVG overlay over a frame, which allows for higher
throughput and potentially visual fidelity at the expense of the
occasional de-synced overlay and video frame.

Bug: 161188385
Change-Id: Ice1047a0ebb1a3ae9f12f178e19a0cc9f22d1720