Изменён алгоритм расчёта LUFS

audioread.hs

@@ -1,7 +1,7 @@
 {-# LANGUAGE DeriveDataTypeable, RecordWildCards #-}
 
 -- Создан:  Ср 28 сен 2016 10:18:53
--- Изменен: Пн 17 окт 2016 16:36:12
+-- Изменен: Чт 20 окт 2016 10:14:42
 
 -- Copyright (C) 2011-2013, Maxim Lihachev, <envrm@yandex.ru>
 
@@ -66,19 +66,19 @@ notZero x = (not $ isNaN x) && (x /= 0)
 -- =============================================================================
 
 -- Чтение данных аудиофайла
-audioread :: WAVE -> [[Double]]
+-- audioread :: WAVE -> [[Double]]
 audioread = map samplesToDouble . waveSamples
 	where samplesToDouble (l:r:[]) = [sampleToDouble l, sampleToDouble r]
 
 --Выбор канала из пары
-getChannel :: [Char] -> [[Double]] -> [Double]
+-- getChannel :: [Char] -> [[Double]] -> [Double]
 getChannel ch = map selectChannel where
 	selectChannel (l:r:[])  | ch == "R" = r
 				| ch == "L" = l
 				| otherwise  = l
 
 -- k десятичных логарифмов
-float2db :: (RealFloat a, Integral b) => b -> a -> a
+-- float2db :: (RealFloat a, Integral b) => b -> a -> a
 float2db k x
 	| notZero x = fromIntegral k * (logBase 10 x)
 	| otherwise = 0
@@ -89,28 +89,28 @@ peak [] = acos(1) -- NaN
 peak xs = maximum xs
 
 -- Вычисление уровня сигнала
-calcLevel :: [Char] -> Int -> [Double] -> Int
+calcLevel :: [Char] -> Int -> [Double] -> Double
 calcLevel vu = case (toLower <@ vu) of
 		"lufs" -> calcLevelLUFS
 		"db"   -> calcLevelDb
 
 -- Вычисление уровня сигнала / Db
-calcLevelDb :: Int -> [Double] -> Int
+calcLevelDb :: Int -> [Double] -> Double
 calcLevelDb fs samples = case dd of
 		[] -> -52 -- Неслышимый звук
-		_  -> round (median dd)
+		_  -> median dd
 	where
 		dd = notZero <# map (float2db 20 . peak) slices
 		slices = splitWhen (== 0) $ take fs samples
 
 -- Вычисление уровня сигнала / LUFS
-calcLevelLUFS :: Int -> [Double] -> Int
-calcLevelLUFS fs samples = round (median $ getlufs <@ chunks)
-	where
-		getlufs l = float2db 10 (1 / fd' * (sum $ map (^2) l))
-		chunks = everyN fd $ take fs samples
-		fd  = fs `div` 10
-		fd' = convert fd :: Double
+calcLevelLUFS :: Int -> [Double] -> Double
+calcLevelLUFS fs samples = lufs
+			where
+				lufs = float2db 10 (1 / fs' * s) + 3
+				s    = sum [x*x | x <- samples]
+				fs'  = convert fs :: Double
+
 
 -- Вычисление значения фазы
 calcPhase :: (Ord a, Fractional a) => [[a]] -> a