WVBitstream

[wavpack.git] / examples / WvInfo.hs

diff --git a/examples/WvInfo.hs b/examples/WvInfo.hs
index 5e0b86fbe62bdbd020e6dc76bbbbcf78752808a3..75c13ab3076510fefdb241e96c152d6fb3be79ab 100644 (file)
--- a/examples/WvInfo.hs
+++ b/examples/WvInfo.hs
@@ -4,21 +4,41 @@
   #-}
 module Main where
 import Codec.Audio.WavPack.Block
+import Codec.Audio.WavPack.Metadata
 import qualified Data.ByteString.Lazy as L
 import qualified Data.Strict as S
+import Data.Maybe
+import Prelude.Unicode
 import System.Environment
 import System.IO
 
 main ∷ IO ()
 main = do [wvFile] ← getArgs
-          wvStream ← L.readFile wvFile
+          wvData   ← L.readFile wvFile
           hSetBuffering stdout NoBuffering
-          showWvInfo wvStream
+          showWvInfo wvData
 
 showWvInfo ∷ L.ByteString → IO ()
 showWvInfo stream
     = case findNextBlock stream of
         (# S.Just block, _ #)
-            → print block
+            → printBlock block
         (# S.Nothing   , _ #)
             → fail "Can't find any WavPack block headers."
+
+printBlock ∷ Block → IO ()
+printBlock b
+    = do putStrLn "- Block header:"
+         print $ blockHeader b
+         putStrLn "- Block metadata sub-blocks:"
+         mapM_ printSub $ blockMetadata b
+    where
+      printSub ∷ SubBlock → IO ()
+      printSub sub
+          | isJust (fromSubBlock sub ∷ Maybe WVBitstream)
+              = putStrLn ( "(WV Bitstream omitted: " ⧺
+                           show (metaSize sub) ⧺
+                           " bytes)"
+                         )
+          | otherwise
+              = print sub