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1 // The MIT License
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2
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3 // Copyright (c) 2009 Massachusetts Institute of Technology
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4
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5 // Permission is hereby granted, free of charge, to any person obtaining a copy
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6 // of this software and associated documentation files (the "Software"), to deal
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7 // in the Software without restriction, including without limitation the rights
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8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 // copies of the Software, and to permit persons to whom the Software is
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10 // furnished to do so, subject to the following conditions:
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11
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12 // The above copyright notice and this permission notice shall be included in
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13 // all copies or substantial portions of the Software.
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14
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15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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21 // THE SOFTWARE.
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22
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23 import Connectable::*;
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24 import GetPut::*;
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25 import ClientServer::*;
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26 import Vector::*;
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27 import FIFO::*;
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28 import FixedPoint::*;
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29
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30 `define MAX_VOICES 2
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31
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32 //AWB includes
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33 `include "asim/provides/low_level_platform_interface.bsh"
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34 `include "asim/provides/soft_connections.bsh"
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35 `include "asim/provides/common_services.bsh"
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36
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37 // Local includes
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38 `include "asim/provides/audio_pipe_types.bsh"
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39 `include "asim/provides/path_types.bsh"
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40
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41 interface PutMixerIn;
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42 method Action sendVoiceIn(AudioStream voiceInput);
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43 endinterface
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44
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45 interface Mixer;
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46 interface PutMixerIn toMixer;
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47 interface Get#(AudioProcessorUnit) mixerOut;
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48 endinterface
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49
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50 function Bool isAudioFini(Vector#(`MAX_VOICES, Reg#(Bool)) voiceStat);
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51 Bool result = True;
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52 for (Integer i = 0; i < `MAX_VOICES; i = i+1)
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53 begin
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54 result = voiceStat[i] && result;
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55 end
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56 return result;
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57 endfunction
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58
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59 module [CONNECTED_MODULE] mkMixer#(Vector#(`MAX_VOICES, Volume) scalars) (Mixer);
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60
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61
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62 // Instantiate the modules
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63 Vector#(`MAX_VOICES, FIFO#(AudioPipeUnit)) voicesIn <- replicateM(mkFIFO());
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64 // <- newVector();
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65 Vector#(`MAX_VOICES, Reg#(Bool)) voiceFini <- replicateM(mkReg(False));
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66
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67 FIFO#(AudioProcessorUnit) masterFifo <- mkFIFO();
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68
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69 rule sendEnd(isAudioFini(voiceFini));
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70 masterFifo.enq(tagged EndOfFile);
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71 //prep for reset
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72 for (Integer i = 0; i < `MAX_VOICES; i = i+1)
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73 voiceFini[i] <= False;
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74 endrule
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75
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76 rule processSample(!isAudioFini(voiceFini)); //implicit on all voiceFifos having data
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77 FixedPoint#(32,32) sum = 0; //this should allow 16 voices at 16 bits without messing up
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78 for (Integer i = 0; i < `MAX_VOICES; i = i+1)
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79 begin
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80 if (voicesIn[i].first() matches tagged Valid .data)
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81 begin
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82 case (data) matches
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83 tagged Sample .sample :
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84 sum = sum + ((fromInt(sample) * fromInt(scalars[i])) >> 8);
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85 //shifting right 8 to divide by 256
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86 tagged EndOfFile :
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87 voiceFini[i] <= True;
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88 endcase
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89 end
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90 else voiceFini[i] <= True;
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91 voicesIn[i].deq();
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92 end
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93
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94 masterFifo.enq(tagged Sample truncate(fxptGetInt(sum >> `MAX_VOICES)));
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95 endrule
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96
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97 // Internal connections
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98
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99 interface PutMixerIn toMixer;
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100 method Action sendVoiceIn(AudioStream voiceInput);
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101 voicesIn[voiceInput.voice].enq(voiceInput.data);
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102 endmethod
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103 endinterface
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104
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105 interface Get mixerOut = fifoToGet(masterFifo);
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106
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107 endmodule
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