Mercurial > pygar

     1 // The MIT License

     2 

     3 // Copyright (c) 2009 Massachusetts Institute of Technology

     4 

     5 // Permission is hereby granted, free of charge, to any person obtaining a copy

     6 // of this software and associated documentation files (the "Software"), to deal

     7 // in the Software without restriction, including without limitation the rights

     8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

     9 // copies of the Software, and to permit persons to whom the Software is

    10 // furnished to do so, subject to the following conditions:

    11 

    12 // The above copyright notice and this permission notice shall be included in

    13 // all copies or substantial portions of the Software.

    14 

    15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

    21 // THE SOFTWARE.

    22 

    23 import Connectable::*;

    24 import GetPut::*;

    25 import ClientServer::*;

    26 import Vector::*;

    27 import FIFO::*;

    28 import FixedPoint::*;

    29 

    30 //AWB includes

    31 `include "asim/provides/low_level_platform_interface.bsh"

    32 `include "asim/provides/soft_connections.bsh"

    33 `include "asim/provides/common_services.bsh"

    34 

    35 // Local includes

    36 `include "asim/provides/audio_pipe_types.bsh"

    37 `include "asim/provides/path_types.bsh"

    38 

    39 interface Mixer;

    40    method Action toMixer(AudioStream streamIn);

    41    interface Get#(AudioProcessorUnit) mainOut;

    42 endinterface

    43 

    44 module [CONNECTED_MODULE]  mkMixer#(Integer numVoices, Vector#(numVoices, Volume) scalars) (Mixer);

    45 

    46    function Bool isAudioFini(Vector#(numVoices, Reg#(Bool)) voiceStat);

    47      Bool result = True;

    48       for (Integer i = 0; i < numVoices; i = i+1)

    49         begin

    50           result = voiceStat[i] && result;

    51         end

    52      return result; 

    53    endfunction

    54 

    55 	 

    56   // Instantiate the modules

    57    Vector#(numVoices, FIFO#(AudioPipeUnit)) voicesIn <- replicateM(mkFIFO());

    58 // <- newVector();

    59    Vector#(numVoices, Reg#(Bool)) voiceFini <- replicateM(mkReg(False));

    60 

    61    FIFO#(AudioProcessorUnit) masterFifo <- mkFIFO();

    62 

    63    rule sendEnd(isAudioFini(voiceFini));

    64       masterFifo.enq(tagged EndOfFile);

    65       //prep for reset

    66       for (Integer i = 0; i < numVoices; i = i+1)

    67 	 voiceFini[i] <= False;

    68    endrule

    69    

    70    rule processSample(!isAudioFini(voiceFini));  //implicit on all voiceFifos having data

    71       FixedPoint#(32,32) sum = 0;  //this should allow 16 voices at 16 bits without messing up

    72       Integer numValid = 0;

    73       for (Integer i = 0; i < numVoices; i = i+1)

    74 	 begin

    75 	    if (voicesIn[i].first() matches tagged Valid .data)

    76 	      begin

    77 		 case (data) matches

    78 		    tagged Sample .sample :

    79 		       begin //shifting right 8 to divide by 256

    80 			  sum = sum + ((fromInt(sample) * fromInt(scalars[i])) >> 8); 

    81 			  numValid = numValid + 1;

    82 		       end

    83 		    tagged EndOfFile :

    84 		       voiceFini[i] <= True;

    85 		 endcase

    86 	      end

    87 	    else voiceFini[i] <= True;

    88 	    voicesIn[i].deq();

    89 	 end

    90        if (numValid > 0)  // If nothing is valid, don't send anything

    91 	  masterFifo.enq(tagged Sample truncate(fxptGetInt(sum >> numVoices)));

    92    endrule

    93  

    94   // Internal connections

    95 

    96    method Action toMixer(AudioStream streamIn);

    97 	 voicesIn[streamIn.voice].enq(streamIn.data);

    98    endmethod

    99    

   100    interface Get mainOut = fifoToGet(masterFifo);

   101 

   102 endmodule
author	rlm
date	Wed, 12 May 2010 02:25:34 -0400
parents	44cc00df1168
children