Move pixel format conversion from uVideoRec to AVWrapper
This has several benefits, being in C-land allows us to better use
libav API and avoid mixing memory allocated from Pascal. Also the C
code for the conversion loop generated by GCC or Clang is probably more
optimized than by Freepascal. Finally it will simplify code in the
future if we are going to enable any other pixel format than yuv420p.
Change the coefficients to improve color accuracy during conversion.
{-# LANGUAGE OverloadedStrings #-}
module Confuse where
import Numeric
import Data.Char
import Control.Monad
import qualified Data.ByteString as B
import qualified Data.ByteString.UTF8 as UTF8
import qualified Data.Map as Map
hx :: [Char] -> String
hx cs = let ch = (chr . fst . last . readHex $ cs) in
case ch of
'\'' -> "''"
'\\' -> "\\\\"
c -> c : []
conv :: String -> B.ByteString
conv s = B.concat ["('", UTF8.fromString i, "', '", UTF8.fromString r, "')"]
where
i :: String
i = hx s
r :: String
r = concatMap hx . words . takeWhile ((/=) ';') . tail $ dropWhile ((/=) '\t') s
convRules :: (B.ByteString, [B.ByteString]) -> B.ByteString
convRules (a, b) = B.concat ["<reset>", u a, "</reset>\n<s>", B.concat $ map u b, "</s>"]
where
u a = B.concat ["\\","u",a]
toPair :: String -> (B.ByteString, [B.ByteString])
toPair s = (UTF8.fromString $ takeWhile isHexDigit s, map UTF8.fromString . words . takeWhile ((/=) ';') . tail $ dropWhile ((/=) '\t') s)
main = do
ll <- liftM (filter (isHexDigit . head) . filter (not . null) . lines) $ readFile "confusables.txt"
B.writeFile "rules.txt" . B.intercalate "\n" . map convRules . Map.toList . Map.fromList . filter notTooLong . filter fits16bit . map toPair $ ll
where
notTooLong = (>) 6 . length . snd
fits16bit (a, b) = let f = (>) 5 . B.length in all f $ a:b