Last active
August 29, 2015 14:05
-
-
Save dramforever/861ca9a743426f705abb to your computer and use it in GitHub Desktop.
slow vector stuff
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
module Main (main) where | |
import Sound.Wav | |
import Data.Int | |
import qualified Data.ByteString.Lazy as B | |
import Data.ByteString.Lazy.Builder | |
import Data.Monoid | |
import System.Environment | |
import System.Exit | |
import System.IO | |
import qualified Data.Vector as V | |
import Sound.Wav.ChannelData | |
{- | |
reverseData :: Int64 -> B.ByteString -> B.ByteString | |
reverseData c d = flipper . B.reverse $ d | |
where flipperBuilder b | |
| B.null b = mempty | |
| otherwise = | |
let (x, y) = B.splitAt c b | |
x' = B.reverse x | |
in lazyByteString x' <> flipperBuilder y | |
flipper b = toLazyByteString (flipperBuilder b) | |
reverseWaveFile :: WaveFile -> Either String WaveFile | |
reverseWaveFile wf = Right wf' | |
where wf' = wf { waveData = wd' } | |
wd' = reverseData chans wd | |
wd = waveData wf | |
chans = fromIntegral . waveNumChannels . waveFormat $ wf | |
-} | |
reverseWaveFile :: WaveFile -> Either String WaveFile | |
reverseWaveFile wf = wf' | |
where wf' = encodeIntegralWaveData wf `fmap` iwd' :: Either String WaveFile | |
iwd' = IntegralWaveData `fmap` wd' :: Either String IntegralWaveData | |
wd' = map V.reverse `fmap` wd :: Either String [IntegralWaveChannel {- = Vector Int64 -}] | |
wd = (\(IntegralWaveData d) -> d) `fmap` iwd :: Either String [IntegralWaveChannel] | |
iwd = extractIntegralWaveData wf :: Either String IntegralWaveData | |
main :: IO () | |
main = do | |
args <- getArgs | |
case args of | |
[fromFile, toFile] -> withWaveFile fromFile $ \ewf -> | |
case ewf of | |
Left err -> do | |
hPutStrLn stderr "Parse error" | |
hPutStrLn stderr err | |
exitFailure | |
Right wf -> | |
case reverseWaveFile wf of | |
Right rwf -> do | |
encodeWaveFile toFile rwf | |
hPutStrLn stderr "" | |
hPutStrLn stderr "Done!" | |
Left err -> do | |
hPutStrLn stderr "Decode error" | |
hPutStrLn stderr err | |
exitFailure | |
_ -> do | |
hPutStrLn stderr "Usage: hrevoice <from> <to>" | |
exitFailure |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment