[mythtv-commits] Ticket #7913: Improve performance of playback startup

[MythTV]

#7913: Improve performance of playback startup
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 Reporter:  Jim Stichnoth <stichnot@…>          |       Owner:  ijr    
     Type:  patch                               |      Status:  new    
 Priority:  minor                               |   Milestone:  unknown
Component:  MythTV - General                    |     Version:  unknown
 Severity:  medium                              |     Mlocked:  0      
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 This patch reduces the "Please Wait...." delay when starting playback.

 On my ION frontends, starting playback takes at least 4 seconds.  About
 650ms is spent in OSD::InitCC708().  This function calls LoadFont() 48
 times (16 caption fonts times 3 font sizes), each instance taking about
 15ms.  In the default MythTV setup, all 16 fonts are the same -- this
 patch detects that situation and reuses the fonts, saving about 600ms.  It
 may have an even greater residual effect, because log output like this:

   playCtx: StartDecoderThread(): took 2023 ms to start player.

 changes to something like this:

   playCtx: StartDecoderThread(): took 930 ms to start player.

 after the patch.

 A better solution would be to cache the 48 fonts globally instead of
 creating and destroying them for every playback instance.  I would look
 into that after the conversion of OSD to MythUI is complete.  In the
 meantime, others with slow frontends may be interested in this patch.

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/7913>
MythTV <http://www.mythtv.org/>
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