I boiled the problems down to a simple example. There are no errors
reported about the messages, but the result is not what we expect.
{-
This module tries to reproduce results of the real-time synthesizer
in scsynth's non-real-time mode.
-}
import Sound.OpenSoundControl(OSC(Bundle), encodeOSC)
import Sound.OpenSoundControl.Byte (encode_i32)
import Sound.OpenSoundControl.Time(utc)
import Sound.OpenSoundControl.Transport(send)
import Sound.SC3
import qualified Sound.SC3.Server.Play as Play
import qualified Data.ByteString.Lazy as B
import System.Cmd (rawSystem)
beep = out 0 (sinOsc AR 440 0)
name ="Beep"
installSound n = d_recv . graphdef n . graph
bundle start t = Bundle (start+t)
rootId = 0
homeId = 1
autoId = -1
latency = 0.1
msgs :: [(Double, [OSC])]
msgs =
(0, g_freeAll [rootId] :
g_new [(homeId, AddToTail, rootId)] :
installSound name beep :
s_new name autoId AddToTail homeId [] :
[]) :
(1, g_freeAll [homeId] :
[]) :
[]
attachTimeStamps :: [(Double, [OSC])] -> IO [OSC]
attachTimeStamps ms =
do now <- utc
return (map (uncurry (bundle (now+latency))) ms)
realtime =
Play.withSC3 $ \fd ->
mapM (send fd) =<< attachTimeStamps msgs
encodeMsg :: OSC -> B.ByteString
encodeMsg msg =
let b = encodeOSC msg
n = fromIntegral (B.length b)
in B.append (encode_i32 n) b
oscFileName = "tone.osc"
nonrealtime =
do let tsMsgs = map (uncurry Bundle) msgs
B.writeFile oscFileName (B.concat (map encodeMsg tsMsgs))
rawSystem "scsynth"
["-o", "1", "-N", oscFileName, "_", "tone.aiff",
"44100", "AIFF", "int16"]
main =
realtime >>
nonrealtime
$ ghci NonRealtime.hs
*Main> realtime
................ audible beep
*Main> nonrealtime
Using Altivec: no
*** ERROR: open directory failed 'synthdefs'
start time 0.501933
*Main> :! wc -c tone.aiff
44342 tone.aiff
That is, the length is wrong (must be around 88000). The audio file
contains constant zero as signal. Can someone reproduce this?
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