interpretor/process.ml

   1 (**
   2         Module: Process
   3         Description: Faust process classes
   4         @author WANG Haisheng
   5         Created: 03/06/2013     Modified: 14/08/2013
   6 *)
   7
   8 open Types;;
   9 open Aux;;
  10 open Basic;;
  11 open Symbol;;
  12 open Value;;
  13 open Signal;;
  14 open Beam;;
  15
  16 exception NotYetDone;;
  17 exception Dimension_error of string;;
  18 exception Process_error of string;;
  19
  20
  21 (* PARSER *)
  22
  23 let exp_of_string s = (Parser.main Lexer.token (Lexing.from_string s));;
  24
  25
  26 class dimension : int * int -> dimension_type =
  27   fun (init : int * int) ->
  28     object (self)
  29       val _input = fst init
  30       val _output = snd init
  31
  32       method input = _input
  33       method output = _output
  34
  35       method par : dimension_type -> dimension_type =
  36         fun dim ->
  37           new dimension
  38             ((self#input + dim#input), (self#output + dim#output))
  39
  40       method seq : dimension_type -> dimension_type =
  41         fun dim ->
  42           if self#output = dim#input then
  43             new dimension (self#input, dim#output)
  44           else raise (Dimension_error "seq dimension not matched.")
  45
  46       method split : dimension_type -> dimension_type =
  47         fun dim ->
  48           if dim#input mod self#output = 0 then
  49             new dimension (self#input, dim#output)
  50           else raise (Dimension_error "split dimension not matched.")
  51
  52       method merge : dimension_type -> dimension_type =
  53         fun dim ->
  54           if self#output mod dim#input = 0 then
  55             new dimension (self#input, dim#output)
  56           else raise (Dimension_error "merge dimension not matched.")
  57
  58       method _rec : dimension_type -> dimension_type =
  59         fun dim ->
  60           if self#output >= dim#input && self#input >= dim#output then
  61             new dimension (self#input - dim#output, self#output)
  62           else raise (Dimension_error "rec dimension not matched.")
  63     end;;
  64
  65 class virtual process =
  66   fun (exp_init : faust_exp) ->
  67     object
  68       val _exp = exp_init
  69       val virtual _dim : dimension_type
  70       val virtual _delay : int
  71       method exp = _exp
  72       method dim = _dim
  73       method delay = _delay
  74       method virtual eval : beam_type -> beam_type
  75     end
  76
  77 class proc_const : faust_exp -> process_type =
  78   fun (exp_init : faust_exp) ->
  79     let _const =
  80       match exp_init with
  81       | Const b -> b
  82       | _ -> raise (Process_error "const process constructor.") in
  83
  84     object (self)
  85       inherit process exp_init
  86       val _dim = new dimension (0,1)
  87       val _delay = 0
  88       method private const = _const
  89       method eval : beam_type -> beam_type =
  90         fun (input : beam_type) ->
  91           if input#get = [||] then
  92             new beam [| new signal (new rate 0 1)
  93                          (fun t -> new value self#const)|]
  94           else
  95             raise (Process_error "proc_const accepts no input.")
  96       end;;
  97
  98
  99 class proc_ident : faust_exp -> process_type =
 100   fun (exp_init : faust_exp) ->
 101     let _symbol =
 102           match exp_init with
 103           | Ident s -> s
 104           | _ -> raise (Process_error "ident process constructor.") in
 105
 106     object (self)
 107       inherit process exp_init
 108       val _dim = new dimension (dimension_of_symbol _symbol)
 109       val _delay = delay_of_symbol _symbol
 110       method private symb = _symbol
 111
 112       method private beam_of_ident : int -> signal_type -> beam_type =
 113         fun (n : int) ->
 114           fun (s : signal_type) ->
 115             if n = (self#dim)#input then
 116               new beam [|s|]
 117             else raise (Process_error ("Ident " ^ string_of_symbol self#symb))
 118
 119       method eval : beam_type -> beam_type =
 120         fun (input : beam_type) ->
 121           let n = Array.length input#get in
 122           match self#symb with
 123           | Pass -> self#beam_of_ident n input#get.(0)
 124           | Stop -> if n = 1 then new beam [||]
 125                     else raise (Process_error "Ident !")
 126           | Add -> self#beam_of_ident n
 127                 ((input#get.(0))#add input#get.(1))
 128           | Sub -> self#beam_of_ident n
 129                 ((input#get.(0))#sub input#get.(1))
 130           | Mul -> self#beam_of_ident n
 131                 ((input#get.(0))#mul input#get.(1))
 132           | Div -> self#beam_of_ident n
 133                 ((input#get.(0))#div input#get.(1))
 134           | Mem -> self#beam_of_ident n
 135                 ((input#get.(0))#mem)
 136           | Delay -> self#beam_of_ident n
 137                 ((input#get.(0))#delay input#get.(1))
 138           | Floor -> self#beam_of_ident n
 139                 ((input#get.(0))#floor)
 140           | Int -> self#beam_of_ident n
 141                 ((input#get.(0))#int)
 142           | Sin -> self#beam_of_ident n
 143                 ((input#get.(0))#sin)
 144           | Cos -> self#beam_of_ident n
 145                 ((input#get.(0))#cos)
 146           | Atan -> self#beam_of_ident n
 147                 ((input#get.(0))#atan)
 148           | Atan2 -> self#beam_of_ident n
 149                 ((input#get.(0))#atan2 input#get.(1))
 150           | Sqrt -> self#beam_of_ident n
 151                 ((input#get.(0))#sqrt)
 152           | Rdtable -> self#beam_of_ident n
 153                 ((input#get.(1))#rdtable input#get.(0) input#get.(2))
 154           | Mod -> self#beam_of_ident n
 155                 ((input#get.(0))#_mod input#get.(1))
 156           | Vectorize -> self#beam_of_ident n
 157                 ((input#get.(0))#vectorize input#get.(1))
 158           | Vconcat -> self#beam_of_ident n
 159                 ((input#get.(0))#vconcat input#get.(1))
 160           | Vpick -> self#beam_of_ident n
 161                 ((input#get.(0))#vpick input#get.(1))
 162           | Serialize -> self#beam_of_ident n
 163                 (input#get.(0))#serialize
 164           | Larger -> self#beam_of_ident n
 165                 ((input#get.(0))#larger input#get.(1))
 166           | Smaller -> self#beam_of_ident n
 167                 ((input#get.(0))#smaller input#get.(1))
 168           | Max -> self#beam_of_ident n
 169                 ((input#get.(0))#max input#get.(1))
 170           | Min -> self#beam_of_ident n
 171                 ((input#get.(0))#min input#get.(1))
 172           | Prefix -> self#beam_of_ident n
 173                 ((input#get.(1))#prefix input#get.(0))
 174           | Select2 -> self#beam_of_ident n
 175                 ((input#get.(0))#select2 input#get.(1) input#get.(2))
 176           | Select3 -> self#beam_of_ident n
 177                 ((input#get.(0))#select3 input#get.(1)
 178                    input#get.(2) input#get.(3))
 179       end;;
 180
 181 class virtual process_binary =
 182   fun (exp_init : faust_exp) ->
 183     let (exp_left, exp_right) =
 184       match exp_init with
 185       | Par (e1, e2) -> (e1, e2)
 186       | Seq (e1, e2) -> (e1, e2)
 187       | Split (e1, e2) -> (e1, e2)
 188       | Merge (e1, e2) -> (e1, e2)
 189       | Rec (e1, e2) -> (e1, e2)
 190       | _ -> raise (Process_error "binary process constructor.") in
 191     let proc_left = (new proc_factory)#make exp_left in
 192     let proc_right = (new proc_factory)#make exp_right in
 193
 194     object
 195       inherit process exp_init
 196       method private proc_left = proc_left
 197       method private proc_right = proc_right
 198
 199       val _dim =
 200         match exp_init with
 201         | Par (e1, e2) -> (proc_left#dim)#par proc_right#dim
 202         | Seq (e1, e2) -> (proc_left#dim)#seq proc_right#dim
 203         | Split (e1, e2) -> (proc_left#dim)#split proc_right#dim
 204         | Merge (e1, e2) -> (proc_left#dim)#merge proc_right#dim
 205         | Rec (e1, e2) -> (proc_left#dim)#_rec proc_right#dim
 206         | _ -> raise (Process_error "binary process constructor.")
 207
 208       val _delay =
 209         match exp_init with
 210         | Par (e1, e2) -> max proc_left#delay proc_right#delay
 211         | Seq (e1, e2) -> proc_left#delay + proc_right#delay
 212         | Split (e1, e2) -> proc_left#delay + proc_right#delay
 213         | Merge (e1, e2) -> proc_left#delay + proc_right#delay
 214         | Rec (e1, e2) -> 1 + proc_left#delay + proc_right#delay
 215         | _ -> raise (Process_error "binary process constructor.")
 216     end
 217
 218 and proc_par : faust_exp -> process_type =
 219   fun (exp_init : faust_exp) ->
 220     object (self)
 221       inherit process_binary exp_init
 222       method eval : beam_type -> beam_type =
 223         fun (input : beam_type) ->
 224           let (sub_input1, sub_input2) = input#cut self#proc_left#dim#input in
 225           let sub_output1 = self#proc_left#eval sub_input1 in
 226           let sub_output2 = self#proc_right#eval sub_input2 in
 227           sub_output1#append sub_output2
 228       end
 229
 230 and proc_split : faust_exp -> process_type =
 231   fun (exp_init : faust_exp) ->
 232     object (self)
 233       inherit process_binary exp_init
 234       method eval : beam_type -> beam_type =
 235         fun (input : beam_type) ->
 236           let mid_output = self#proc_left#eval input in
 237           let mid_input = mid_output#matching self#proc_right#dim#input in
 238           self#proc_right#eval mid_input
 239       end
 240
 241 and proc_merge : faust_exp -> process_type =
 242   fun (exp_init : faust_exp) ->
 243     object (self)
 244       inherit process_binary exp_init
 245       method eval : beam_type -> beam_type =
 246         fun (input : beam_type) ->
 247           let mid_output = self#proc_left#eval input in
 248           let mid_input = mid_output#matching self#proc_right#dim#input in
 249           self#proc_right#eval mid_input
 250       end
 251
 252 and proc_seq : faust_exp -> process_type =
 253   fun (exp_init : faust_exp) ->
 254     object (self)
 255       inherit process_binary exp_init
 256       method eval : beam_type -> beam_type =
 257         fun (input : beam_type) ->
 258           let mid_output = self#proc_left#eval input in
 259           self#proc_right#eval mid_output
 260       end
 261
 262 and proc_rec : faust_exp -> process_type =
 263   fun (exp_init : faust_exp) ->
 264     object (self)
 265       inherit process_binary exp_init
 266       method eval : beam_type -> beam_type =
 267         fun (input : beam_type) ->
 268           let memory = Hashtbl.create self#delay in
 269           let rates = ref (Array.make self#dim#output (new rate 0 1)) in
 270
 271           let split : (time -> value_type array) -> (time -> value_type) array =
 272             fun beam_at ->
 273               let get_signal =
 274                 fun beam_func -> fun i -> fun t ->
 275                 (beam_func t).(i) in
 276               Array.init self#dim#output (get_signal beam_at) in
 277
 278           let feedback : (time -> value_type array) -> beam =
 279             fun beam_at ->
 280               let signals_at = split beam_at in
 281               let delay_by_one = fun s -> fun t -> s (t - 1) in
 282               let delay_signal_funcs = Array.map delay_by_one
 283                   (Array.sub signals_at 0 self#proc_right#dim#input) in
 284               new beam (array_map2 (new signal)
 285                           (Array.sub !rates 0 self#proc_right#dim#input)
 286                           delay_signal_funcs) in
 287
 288           let rec beam_at : time -> value_type array =
 289             fun (t : time) ->
 290               if t < 0 then
 291                 Array.make self#dim#output (new value Zero)
 292               else if Hashtbl.mem memory t then
 293                 Hashtbl.find memory t
 294               else
 295                 let beam_fb_in = feedback beam_at in
 296                 let beam_fb_out = self#proc_right#eval beam_fb_in in
 297                 let beam_in = beam_fb_out#append input in
 298                 let beam_out = self#proc_left#eval beam_in in
 299                 let values = beam_out#at t in
 300                 let () = (rates := beam_out#frequency) in
 301                 let () = Hashtbl.add memory t values in
 302                 let () = if t - self#delay >= 0 then
 303                   Hashtbl.remove memory (t - self#delay) else () in
 304                 values in
 305           new beam (array_map2 (new signal) !rates (split beam_at))
 306     end
 307
 308 and proc_factory =
 309   object
 310       method make : faust_exp -> process_type =
 311         fun (exp : faust_exp) ->
 312           match exp with
 313           | Const b -> new proc_const exp
 314           | Ident s -> new proc_ident exp
 315           | Par (e1, e2) -> new proc_par exp
 316           | Seq (e1, e2) -> new proc_seq exp
 317           | Split (e1, e2) -> new proc_split exp
 318           | Merge (e1, e2) -> new proc_merge exp
 319           | Rec (e1, e2) -> new proc_rec exp
 320   end;;