[mythtv-commits] Ticket #6849: Hue setting changes between xv-blit and vdpau

[MythTV]

#6849: Hue setting changes between xv-blit and vdpau
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 Reporter:  anonymous                |        Owner:  markk 
     Type:  defect                   |       Status:  closed
 Priority:  minor                    |    Milestone:  0.22  
Component:  MythTV - Video Playback  |      Version:  head  
 Severity:  low                      |   Resolution:  fixed 
  Mlocked:  0                        |  
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Changes (by markk):

  * status:  accepted => closed
  * resolution:  => fixed


Comment:

 (In [21522]) Fix the XVideo hue range for NVIDIA drivers.

 The default range of the hue setting has been changed in more recent
 drivers, which broke the existing 'hue base' assumption. Instead of trying
 to guess the appropriate adjustment from the driver version etc, we use
 the XV_SET_DEFAULTS attribute to restore the xvideo attributes to their
 defaults and calculate the appropriate range offset from that. The
 behaviour is unchanged if the XV_SET_DEFAULTS attribute is not available.

 We do however need to save the existing attribute values and later restore
 them. This has the added bonus/side-effect of restoring the xvideo port
 attributes to the state in which MythTV found them (possibly with the
 exception of XV_COLORKEY and XV_AUTOPAINT_COLORKEY).

 Technically we should probably revisit the offset assumptions for all
 xvideo attributes in 0.23 and rebase the hue setting generally - as most
 implementations now seem to use a default of 50% of the range rather than
 the 0% we assume.

 Closes #6849. Closes #6778.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/6849#comment:2>
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