When dynamic caps change in the pipeline leads to a new buffer pool
getting negotiated, the change is not propagated to Qt6GLWindow, which
keeps using the old, now defunct, pool.
Unset current pool on Qt6GLWindow in decide_allocation(). This will
trigger a switch to the new pool inside create().
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8676>
After rendering a QML scene the qml6glsrc element copies the contents of
the scene to a GStreamer buffer. This happens on the Qt render thread.
Then it attaches a sync point to the destination buffer. This sync point
must be awaited by other threads which use the buffer later on. The
current implementation relies on the downstream elements to wait for the
sync point. However, there are situation where this does not work. The
GstBaseTransform e.g. copies the buffer metadata (which overwrites the
sync point without waiting for it) *before* waiting for the sync point.
This commit waits for the sync point inside the qml6glsrc element before
sending it downstream. The wait command is issued on the streaming
thread with the pipeline OpenGL context, i.e. it will synchronize with
the GStreamer OpenGL thread.
This is a port of the original fix for the qmlglsrc element.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5519>
