[mythtv] [PATCH] input adjust filter
Andrew Mahone
andrewmahone at eml.cc
Sat Jan 31 22:27:04 EST 2004
The attached patch adds an input range/gamma adjustment filter. The primary
use for this filter is with bt8x8 and other cards that produce luma/chroma
values with incorrect ranges (ie not ITU-R601). These values can go well
outside the correct ranges, causing video to look washed out. The filter
takes 6 parameters. If no parameters or not all 6 are given, it will use a
default set intended to correct broken bt8x8 video. The parameters are as
follows:
1: luma minimum input value (int)
2: luma maximum input value (int)
3: luma gamma correction (float)
4: chroma minimum input value (int)
5: chroma maximum input value (int)
6: chroma gamma correction (float)
The default bt8x8 correction values are equivalent to "16:253:1.0:2:253:1.0".
Output ranges are fixed at ITU-R601 values (16-235 luma, 16-240 chroma). It
runs about 570fps on my system.
--
Andrew Mahone
andrewmahone AT eml DOT cc
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