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1 /*
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2
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3 Copyright (C) 2016 Queen Mary University of London
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4 Author: Fiore Martin
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5
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6 This file is part of Collidoscope.
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7
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8 Collidoscope is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation, either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include "MIDI.h"
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23 #include "Config.h"
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24
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25
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26 collidoscope::MIDI::MIDI()
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27 {
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28 }
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29
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30
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31 collidoscope::MIDI::~MIDI()
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32 {
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33 // FIXME check cause destructor of RTInput might throw
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34 for ( auto & input : mInputs )
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35 input->closePort();
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36 }
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37
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38 void collidoscope::MIDI::RtMidiInCallback( double deltatime, std::vector<unsigned char> *message, void *userData )
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39 {
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40 collidoscope::MIDI* midi = ((collidoscope::MIDI*)userData);
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41 std::lock_guard< std::mutex > lock( midi->mMutex );
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42
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43 MIDIMessage msg = midi->parseRtMidiMessage( message );
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44
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45 switch ( msg.getVoice() ){
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46 case MIDIMessage::Voice::ePitchBend:
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47 midi->mPitchBendMessages[msg.getChannel()] = msg;
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48 break;
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49
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50 case MIDIMessage::Voice::eControlChange:
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51 if ( msg.getChannel() == 7 ) // FIXME no harcoded
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52 midi->mFilterMessages[msg.getChannel()] = msg;
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53 else
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54 midi->mMIDIMessages.push_back( msg );
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55 break;
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56
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57 default:
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58 midi->mMIDIMessages.push_back( msg );
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59 break;
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60 }
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61 }
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62
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63 void collidoscope::MIDI::setup( const Config& config )
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64 {
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65 unsigned int numPorts = 0;
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66
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67 try {
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68 RtMidiIn in;
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69 numPorts = in.getPortCount();
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70 }
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71 catch ( RtMidiError &error ) {
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72 throw MIDIException( error.getMessage() );
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73 }
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74
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75 if ( numPorts == 0 ){
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76 throw MIDIException(" no MIDI input found ");
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77 }
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78
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79 for ( unsigned int portNum = 0; portNum < numPorts; portNum++ ) {
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80 try {
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81 std::unique_ptr< RtMidiIn > input ( new RtMidiIn() );
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82 input->openPort( portNum, "Collidoscope Input" );
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83 input->setCallback( &RtMidiInCallback, this );
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84 mInputs.push_back( std::move(input) );
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85
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86 }
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87 catch ( RtMidiError &error ) {
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88 throw MIDIException( error.getMessage() );
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89 }
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90 }
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91 }
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92
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93
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94 void collidoscope::MIDI::checkMessages( std::vector<MIDIMessage> & midiMessages )
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95 {
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96 std::lock_guard<std::mutex> lock( mMutex );
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97 midiMessages.swap( mMIDIMessages );
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98
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99 for ( int i = 0; i < NUM_WAVES; i++ ){
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100 if ( mPitchBendMessages[i].mVoice != MIDIMessage::Voice::eIgnore ){
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101 midiMessages.push_back( mPitchBendMessages[i] );
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102 mPitchBendMessages[i].mVoice = MIDIMessage::Voice::eIgnore;
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103 }
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104
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105 if ( mFilterMessages[i].mVoice != MIDIMessage::Voice::eIgnore ){
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106 midiMessages.push_back( mFilterMessages[i] );
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107 mFilterMessages[i].mVoice = MIDIMessage::Voice::eIgnore;
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108 }
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109 }
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110 }
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111
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112 // only call this function when the size of mRtMidiMessage != 0
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113 collidoscope::MIDIMessage collidoscope::MIDI::parseRtMidiMessage( std::vector<unsigned char> *rtMidiMessage )
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114 {
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115 collidoscope::MIDIMessage msg;
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116
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117 size_t numBytes = rtMidiMessage->size();
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118
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119 // voice is the 4 most significant bits
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120 unsigned char voice = (*rtMidiMessage)[0] >> 4;
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121
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122 switch ( voice ){
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123 case 0x9 :
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124 msg.mVoice = MIDIMessage::Voice::eNoteOn;
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125 break;
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126
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127 case 0x8:
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128 msg.mVoice = MIDIMessage::Voice::eNoteOff;
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129 break;
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130
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131 case 0xB:
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132 msg.mVoice = MIDIMessage::Voice::eControlChange;
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133 break;
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134
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135 case 0xE:
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136 msg.mVoice = MIDIMessage::Voice::ePitchBend;
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137 break;
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138
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139 default:
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140 msg.mVoice = MIDIMessage::Voice::eIgnore;
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141 return msg;
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142 }
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143
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144 // channel is 4 less significant bits
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145 unsigned char channel = (*rtMidiMessage)[0] & 0x0f;
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146 msg.mChannel = channel;
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147
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148 //data byte 1
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149 msg.mData1 = (*rtMidiMessage)[1];
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150
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151 // data byte 2 if it exists
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152 msg.mData2 = (numBytes == 3 ? (*rtMidiMessage)[2] : 0);
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153
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154 return msg;
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155 }
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