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.