id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	mlocked
8695	Optimize DVBStreamHandler::UpdateFiltersFromStreamData()	Rune Petersen <rune@…>	Janne Grunau	"The current UpdateFiltersFromStreamData() figures out what pids have changed(added/removed) by comparing two maps.
This is a needlessly expensive way of doing it considering it is called quite often by RunTS().

The managing of pid changes could be done better/cheaper by the MPEGStreamData class since it is it already manages the pids, and know when they change.

I have attached a PoC patch that reduces CPU usage of the backend by 20-30% - (active EIT and no frontend) this is on a Geode system.
On a faster system this may very well be insignificant.


The patch will change the functionality slightly if a pid is removed and added again in MPEGStreamData.

Current behavior:
   UpdateFiltersFromStreamData() will make no change 

The PoC patch:
   UpdateFiltersFromStreamData() will close the filter, and then reopen it."	enhancement	closed	minor	unknown	MythTV - DVB	0.23-fixes	low	Won't Fix		Stuart Auchterlonie	0