StartTimeSource
status_t StartTimeSource(const media_node& node,
status = fMediaRoster->StartTimeSource(fTimeSourceNode, real);
status_t err = manager->roster->StartTimeSource(ref->node(), when);
status = fMediaRoster->StartTimeSource(fTimeSource, real);
err = BMediaRoster::CurrentRoster()->StartTimeSource(
roster->StartTimeSource(fPlayerNode->TimeSource()->Node(),
err = BMediaRoster::CurrentRoster()->StartTimeSource(
fRoster->StartTimeSource(clone,
fRoster->StartTimeSource(info[i].node,