[vdr] Different between '#define MAXOSDAREAS 16' and '#define MAXNUMWINDOWS 7'

Udo Richter udo_richter at gmx.de
Thu Sep 29 22:25:11 CEST 2005

Webmaster wrote:
> why is "#define MAXNUMWINDOWS 7" defined in dvbosd.c
> and "#define MAXOSDAREAS 16" in osd.h ?
> Its not the same and only 7 areas possible to create ??
> Its a limit to the OSD/card ?

MAXNUMWINDOWS=7 is the maximum number of areas that FF DVB cards 
support. VDR however uses a more abstract interface that supports up to 
MAXOSDAREAS=16 different areas, provide that the OSD device can handle 
them. To know the real number of supported areas, you have to do several 
calls to CanHendleAreas.

Unfortunately, VDR does not enforce MAXOSDAREAS itself, so you may be 
able to call SetAreas(...,100) on a very flexible OSD device, which will 
probably lead to a solid crash due to non-handled cOsd internal buffer 



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