Query the sink for the latency parameters. The latency will be queried from
the upstream elements. live will be TRUE if sink is configured to
synchronize against the clock. upstream_live will be TRUE if an upstream
element is live.
If both live and upstream_live are TRUE, the sink will want to compensate
for the latency introduced by the upstream elements by setting the
min_latency to a strictly positive value.
Query the sink for the latency parameters. The latency will be queried from the upstream elements. live will be TRUE if sink is configured to synchronize against the clock. upstream_live will be TRUE if an upstream element is live.
If both live and upstream_live are TRUE, the sink will want to compensate for the latency introduced by the upstream elements by setting the min_latency to a strictly positive value.
This function is mostly used by subclasses.