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 0 (fun t -> new value self#const)|]
  93           else
  94             raise (Process_error "proc_const accepts no input.")
  95       end;;
  96
  97
  98 class proc_ident : faust_exp -> process_type =
  99   fun (exp_init : faust_exp) ->
 100     let _symbol =
 101           match exp_init with
 102           | Ident s -> s
 103           | _ -> raise (Process_error "ident process constructor.") in
 104
 105     object (self)
 106       inherit process exp_init
 107       val _dim = new dimension (dimension_of_symbol _symbol)
 108       val _delay = delay_of_symbol _symbol
 109       method private symb = _symbol
 110
 111       method private beam_of_ident : int -> signal_type -> beam_type =
 112         fun (n : int) ->
 113           fun (s : signal_type) ->
 114             if n = (self#dim)#input then
 115               new beam [|s|]
 116             else raise (Process_error ("Ident " ^ string_of_symbol self#symb))
 117
 118       method eval : beam_type -> beam_type =
 119         fun (input : beam_type) ->
 120           let n = Array.length input#get in
 121           match self#symb with
 122           | Pass -> self#beam_of_ident n input#get.(0)
 123           | Stop -> if n = 1 then new beam [||]
 124                     else raise (Process_error "Ident !")
 125           | Add -> self#beam_of_ident n
 126                 ((input#get.(0))#add input#get.(1))
 127           | Sub -> self#beam_of_ident n
 128                 ((input#get.(0))#sub input#get.(1))
 129           | Mul -> self#beam_of_ident n
 130                 ((input#get.(0))#mul input#get.(1))
 131           | Div -> self#beam_of_ident n
 132                 ((input#get.(0))#div input#get.(1))
 133           | Mem -> self#beam_of_ident n
 134                 ((input#get.(0))#mem)
 135           | Delay -> self#beam_of_ident n
 136                 ((input#get.(0))#delay input#get.(1))
 137           | Floor -> self#beam_of_ident n
 138                 ((input#get.(0))#floor)
 139           | Int -> self#beam_of_ident n
 140                 ((input#get.(0))#int)
 141           | Sin -> self#beam_of_ident n
 142                 ((input#get.(0))#sin)
 143           | Cos -> self#beam_of_ident n
 144                 ((input#get.(0))#cos)
 145           | Atan -> self#beam_of_ident n
 146                 ((input#get.(0))#atan)
 147           | Atan2 -> self#beam_of_ident n
 148                 ((input#get.(0))#atan2 input#get.(1))
 149           | Sqrt -> self#beam_of_ident n
 150                 ((input#get.(0))#sqrt)
 151           | Rdtable -> self#beam_of_ident n
 152                 ((input#get.(1))#rdtable input#get.(0) input#get.(2))
 153           | Mod -> self#beam_of_ident n
 154                 ((input#get.(0))#_mod input#get.(1))
 155           | Vectorize -> self#beam_of_ident n
 156                 ((input#get.(0))#vectorize input#get.(1))
 157           | Vconcat -> self#beam_of_ident n
 158                 ((input#get.(0))#vconcat input#get.(1))
 159           | Vpick -> self#beam_of_ident n
 160                 ((input#get.(0))#vpick input#get.(1))
 161           | Serialize -> self#beam_of_ident n
 162                 (input#get.(0))#serialize
 163           | Larger -> self#beam_of_ident n
 164                 ((input#get.(0))#larger input#get.(1))
 165           | Smaller -> self#beam_of_ident n
 166                 ((input#get.(0))#smaller input#get.(1))
 167           | Max -> self#beam_of_ident n
 168                 ((input#get.(0))#max input#get.(1))
 169           | Min -> self#beam_of_ident n
 170                 ((input#get.(0))#min input#get.(1))
 171           | Prefix -> self#beam_of_ident n
 172                 ((input#get.(1))#prefix input#get.(0))
 173           | Select2 -> self#beam_of_ident n
 174                 ((input#get.(0))#select2 input#get.(1) input#get.(2))
 175           | Select3 -> self#beam_of_ident n
 176                 ((input#get.(0))#select3 input#get.(1)
 177                    input#get.(2) input#get.(3))
 178       end;;
 179
 180 class virtual process_binary =
 181   fun (exp_init : faust_exp) ->
 182     let (exp_left, exp_right) =
 183       match exp_init with
 184       | Par (e1, e2) -> (e1, e2)
 185       | Seq (e1, e2) -> (e1, e2)
 186       | Split (e1, e2) -> (e1, e2)
 187       | Merge (e1, e2) -> (e1, e2)
 188       | Rec (e1, e2) -> (e1, e2)
 189       | _ -> raise (Process_error "binary process constructor.") in
 190     let proc_left = (new proc_factory)#make exp_left in
 191     let proc_right = (new proc_factory)#make exp_right in
 192
 193     object
 194       inherit process exp_init
 195       method private proc_left = proc_left
 196       method private proc_right = proc_right
 197
 198       val _dim =
 199         match exp_init with
 200         | Par (e1, e2) -> (proc_left#dim)#par proc_right#dim
 201         | Seq (e1, e2) -> (proc_left#dim)#seq proc_right#dim
 202         | Split (e1, e2) -> (proc_left#dim)#split proc_right#dim
 203         | Merge (e1, e2) -> (proc_left#dim)#merge proc_right#dim
 204         | Rec (e1, e2) -> (proc_left#dim)#_rec proc_right#dim
 205         | _ -> raise (Process_error "binary process constructor.")
 206
 207       val _delay =
 208         match exp_init with
 209         | Par (e1, e2) -> max proc_left#delay proc_right#delay
 210         | Seq (e1, e2) -> proc_left#delay + proc_right#delay
 211         | Split (e1, e2) -> proc_left#delay + proc_right#delay
 212         | Merge (e1, e2) -> proc_left#delay + proc_right#delay
 213         | Rec (e1, e2) -> 1 + proc_left#delay + proc_right#delay
 214         | _ -> raise (Process_error "binary process constructor.")
 215     end
 216
 217 and proc_par : faust_exp -> process_type =
 218   fun (exp_init : faust_exp) ->
 219     object (self)
 220       inherit process_binary exp_init
 221       method eval : beam_type -> beam_type =
 222         fun (input : beam_type) ->
 223           let (sub_input1, sub_input2) = input#cut self#proc_left#dim#input in
 224           let sub_output1 = self#proc_left#eval sub_input1 in
 225           let sub_output2 = self#proc_right#eval sub_input2 in
 226           sub_output1#append sub_output2
 227       end
 228
 229 and proc_split : faust_exp -> process_type =
 230   fun (exp_init : faust_exp) ->
 231     object (self)
 232       inherit process_binary exp_init
 233       method eval : beam_type -> beam_type =
 234         fun (input : beam_type) ->
 235           let mid_output = self#proc_left#eval input in
 236           let mid_input = mid_output#matching self#proc_right#dim#input in
 237           self#proc_right#eval mid_input
 238       end
 239
 240 and proc_merge : faust_exp -> process_type =
 241   fun (exp_init : faust_exp) ->
 242     object (self)
 243       inherit process_binary exp_init
 244       method eval : beam_type -> beam_type =
 245         fun (input : beam_type) ->
 246           let mid_output = self#proc_left#eval input in
 247           let mid_input = mid_output#matching self#proc_right#dim#input in
 248           self#proc_right#eval mid_input
 249       end
 250
 251 and proc_seq : faust_exp -> process_type =
 252   fun (exp_init : faust_exp) ->
 253     object (self)
 254       inherit process_binary exp_init
 255       method eval : beam_type -> beam_type =
 256         fun (input : beam_type) ->
 257           let mid_output = self#proc_left#eval input in
 258           self#proc_right#eval mid_output
 259       end
 260
 261 and proc_rec : faust_exp -> process_type =
 262   fun (exp_init : faust_exp) ->
 263     object (self)
 264       inherit process_binary exp_init
 265       method eval : beam_type -> beam_type =
 266         fun (input : beam_type) ->
 267           let memory = Hashtbl.create self#delay in
 268           let rates = ref (Array.make self#dim#output 0) in
 269
 270           let split : (time -> value_type array) -> (time -> value_type) array =
 271             fun beam_at ->
 272               let get_signal =
 273                 fun beam_func -> fun i -> fun t ->
 274                 (beam_func t).(i) in
 275               Array.init self#dim#output (get_signal beam_at) in
 276
 277           let feedback : (time -> value_type array) -> beam =
 278             fun beam_at ->
 279               let signals_at = split beam_at in
 280               let delay_by_one = fun s -> fun t -> s (t - 1) in
 281               let delay_signal_funcs = Array.map delay_by_one
 282                   (Array.sub signals_at 0 self#proc_right#dim#input) in
 283               new beam (array_map2 (new signal)
 284                           (Array.sub !rates 0 self#proc_right#dim#input)
 285                           delay_signal_funcs) in
 286
 287           let rec beam_at : time -> value_type array =
 288             fun (t : time) ->
 289               if t < 0 then
 290                 Array.make self#dim#output (new value Zero)
 291               else if Hashtbl.mem memory t then
 292                 Hashtbl.find memory t
 293               else
 294                 let beam_fb_in = feedback beam_at in
 295                 let beam_fb_out = self#proc_right#eval beam_fb_in in
 296                 let beam_in = beam_fb_out#append input in
 297                 let beam_out = self#proc_left#eval beam_in in
 298                 let values = beam_out#at t in
 299                 let () = (rates := beam_out#frequency) in
 300                 let () = Hashtbl.add memory t values in
 301                 let () = if t - self#delay >= 0 then
 302                   Hashtbl.remove memory (t - self#delay) else () in
 303                 values in
 304           new beam (array_map2 (new signal) !rates (split beam_at))
 305     end
 306
 307 and proc_factory =
 308   object
 309       method make : faust_exp -> process_type =
 310         fun (exp : faust_exp) ->
 311           match exp with
 312           | Const b -> new proc_const exp
 313           | Ident s -> new proc_ident exp
 314           | Par (e1, e2) -> new proc_par exp
 315           | Seq (e1, e2) -> new proc_seq exp
 316           | Split (e1, e2) -> new proc_split exp
 317           | Merge (e1, e2) -> new proc_merge exp
 318           | Rec (e1, e2) -> new proc_rec exp
 319   end;;