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 `define MAX_VOICES 2

    31 

    32 //AWB includes

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

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

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

    36 

    37 // Local includes

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

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

    40 

    41 interface PutMixerIn;

    42    method Action sendVoiceIn(AudioStream voiceInput);

    43 endinterface 

    44 

    45 interface Mixer;

    46    interface PutMixerIn toMixer;

    47    interface Get#(AudioProcessorUnit) mixerOut;

    48 endinterface

    49 

    50 function Bool isAudioFini(Vector#(`MAX_VOICES, Reg#(Bool)) voiceStat);

    51    Bool result = True;

    52    for (Integer i = 0; i < `MAX_VOICES; i = i+1)

    53       begin

    54          result = voiceStat[i] && result;

    55       end

    56    return result; 

    57 endfunction

    58 

    59 module [CONNECTED_MODULE]  mkMixer#(Vector#(`MAX_VOICES, Volume) scalars) (Mixer);

    60 

    61 	 

    62   // Instantiate the modules

    63    Vector#(`MAX_VOICES, FIFO#(AudioPipeUnit)) voicesIn <- replicateM(mkFIFO());

    64 // <- newVector();

    65    Vector#(`MAX_VOICES, Reg#(Bool)) voiceFini <- replicateM(mkReg(False));

    66 

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

    68 

    69    rule sendEnd(isAudioFini(voiceFini));

    70       masterFifo.enq(tagged EndOfFile);

    71       //prep for reset

    72       for (Integer i = 0; i < `MAX_VOICES; i = i+1)

    73 	 voiceFini[i] <= False;

    74    endrule

    75    

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

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

    78       for (Integer i = 0; i < `MAX_VOICES; i = i+1)

    79 	 begin

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

    81 	      begin

    82 		 case (data) matches

    83 		    tagged Sample .sample :

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

    85 	            //shifting right 8 to divide by 256

    86 		    tagged EndOfFile :

    87 		       voiceFini[i] <= True;

    88 		 endcase

    89 	      end

    90 	    else voiceFini[i] <= True;

    91 	    voicesIn[i].deq();

    92 	 end

    93       

    94        masterFifo.enq(tagged Sample truncate(fxptGetInt(sum >> `MAX_VOICES)));

    95    endrule

    96  

    97   // Internal connections

    98 

    99    interface PutMixerIn toMixer;

   100       method Action sendVoiceIn(AudioStream voiceInput);

   101 	 voicesIn[voiceInput.voice].enq(voiceInput.data);

   102       endmethod

   103    endinterface

   104       

   105    interface Get mixerOut = fifoToGet(masterFifo);

   106 

   107 endmodule
author	rlm
date	Wed, 05 May 2010 14:40:48 -0400
parents	9b0dfce52c29
children	2991344775f8