[MPlayer-dev-eng] [PATCH] Fix regression in v4l2 channel tuning on cx88 cards

[Jon Doe]

Hi,

This patch tries to improve (not completely fix) a v4l regression from
svn r27057 which introduced per channel resetting of v4l2 normids when
tuning channels. The relevant bug report can be found at
http://bugzilla.mplayerhq.hu/show_bug.cgi?id=1326. I tested on cx88
and bt878 based cards. Only the cx88 is affected.

The problem is that cx88 based cards will reset the picture size to
320x240 when changing norms, squashing the picture to a quarter size
in the top left corner when changing channels in mplayer. The cx8800
driver needs to reset the picture size due to a hardware filter
recalculation requirement when changing norms. Others have also
noticed this problem in the driver, but no comprehensive fix was found
- see http://www.mail-archive.com/linux-media@vger.kernel.org/msg00157.html

The fix proposed is to only change the norm if the new channel norm
(eg. NTSC) differs from the current norm (eg. PAL-I), as specified in
the user config file. This should at least work for most people most
of the time and speed up channel tuning at the same time.
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