RCMA/Translator/Message.hs

   1 module RCMA.Translator.Message where
   2
   3 import           RCMA.Semantics
   4 import qualified Sound.JACK                       as Jack
   5 import qualified Sound.MIDI.Message               as Message
   6 import qualified Sound.MIDI.Message.Channel       as Channel
   7 import qualified Sound.MIDI.Message.Channel.Voice as Voice
   8
   9 -- We might want to move that to Semantics.
  10 type SampleRate = Int
  11
  12 type RawMessage = Message.T
  13
  14 type MidiVoice = Voice.T
  15
  16 type Channel = Channel.Channel
  17
  18 type ControllerIdx = Voice.Controller
  19
  20 type Frames = Int
  21
  22 -- Each channel is linked to a particular translation signal function
  23 -- itself linked to a particular layer. Therefore we will dispose of
  24 -- the channel number as soon as possible.
  25 ---
  26 -- /!\ This is dangerous as it only treats unipolar control values.
  27 data Message = NoteOn  Channel Pitch Strength
  28              | NoteOff Channel Pitch Strength
  29              | Control Channel ControllerIdx UCtrl
  30   deriving(Show)
  31
  32 getChannel :: Message -> Int
  33 getChannel (NoteOn c _ _) = Channel.fromChannel c
  34 getChannel (NoteOff c _ _) = Channel.fromChannel c
  35 getChannel (Control c _ _) = Channel.fromChannel c
  36
  37 makeChannel :: Int -> Channel
  38 makeChannel = Channel.toChannel
  39
  40 -- Function to go back and forth with the representations of pitches,
  41 -- as they are different in our model and in the Jack API model.
  42 fromRawPitch :: Voice.Pitch -> Pitch
  43 fromRawPitch p = Pitch $ Voice.fromPitch p
  44
  45 toRawPitch :: Pitch -> Voice.Pitch
  46 toRawPitch (Pitch p) = Voice.toPitch p
  47
  48
  49 isNoteOn :: Message -> Bool
  50 isNoteOn (NoteOn _ _ _) = True
  51 isNoteOn _ = False
  52
  53 isNoteOff :: Message -> Bool
  54 isNoteOff (NoteOff _ _ _) = True
  55 isNoteOff _ = False
  56
  57 isControl :: Message -> Bool
  58 isControl (Control _ _ _) = True
  59 isControl _ = False
  60
  61 switchOnOff :: Message -> Message
  62 switchOnOff (NoteOn  c p v) = NoteOff c p v
  63 switchOnOff (NoteOff c p v) = NoteOn  c p v
  64
  65 fromRawMessage :: RawMessage -> Maybe Message
  66 fromRawMessage (Message.Channel (Channel.Cons c
  67                                  (Channel.Voice (Voice.NoteOn  p v)))) =
  68   Just $ NoteOn  c (fromRawPitch p) (toUCtrl $ Voice.fromVelocity v)
  69 fromRawMessage (Message.Channel (Channel.Cons c
  70                                  (Channel.Voice (Voice.NoteOff p v)))) =
  71   Just $ NoteOff c (fromRawPitch p) (toUCtrl $ Voice.fromVelocity v)
  72 fromRawMessage (Message.Channel (Channel.Cons c
  73                                  (Channel.Voice (Voice.Control n v)))) =
  74   Just $ Control c n (toUCtrl v)
  75 fromRawMessage _ = Nothing
  76
  77 toRawMessage :: Message -> RawMessage
  78 toRawMessage (NoteOn  c p v) =
  79   (Message.Channel $ Channel.Cons c
  80     (Channel.Voice $ Voice.NoteOn  (toRawPitch p) (Voice.toVelocity $ fromUCtrl v)))
  81 toRawMessage (NoteOff c p v) =
  82   (Message.Channel $ Channel.Cons c
  83     (Channel.Voice $ Voice.NoteOff (toRawPitch p) (Voice.toVelocity $ fromUCtrl v)))
  84 toRawMessage (Control c n v) =
  85   (Message.Channel (Channel.Cons c
  86                      (Channel.Voice (Voice.Control n (fromUCtrl v)))))