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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006-2009 Chris Cannam and QMUL.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #include "MIDIInput.h"
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17
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18 #include "rtmidi/RtMidi.h"
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19
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20 MIDIInput::MIDIInput(QString name, FrameTimer *timer) :
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21 m_rtmidi(),
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22 m_frameTimer(timer),
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23 m_buffer(1023)
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24 {
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25 try {
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26 m_rtmidi = new RtMidiIn(name.toStdString());
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27 m_rtmidi->setCallback(staticCallback, this);
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28 m_rtmidi->openPort(0, tr("Input").toStdString());
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29 } catch (RtError e) {
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30 e.printMessage();
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31 delete m_rtmidi;
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32 m_rtmidi = 0;
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33 }
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34 }
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35
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36 MIDIInput::~MIDIInput()
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37 {
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38 delete m_rtmidi;
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39 }
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40
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41 void
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42 MIDIInput::staticCallback(double timestamp, std::vector<unsigned char> *message,
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43 void *userData)
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44 {
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45 ((MIDIInput *)userData)->callback(timestamp, message);
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46 }
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47
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48 void
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49 MIDIInput::callback(double timestamp, std::vector<unsigned char> *message)
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50 {
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51 std::cerr << "MIDIInput::callback(" << timestamp << ")" << std::endl;
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52 // In my experience so far, the timings passed to this function
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53 // are not reliable enough to use. We request instead an audio
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54 // frame time from whatever FrameTimer we have been given, and use
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55 // that as the event time.
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56 if (!message || message->empty()) return;
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57 unsigned long t = m_frameTimer->getFrame();
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58 MIDIEvent ev(t,
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59 (*message)[0],
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60 message->size() > 1 ? (*message)[1] : 0,
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61 message->size() > 2 ? (*message)[2] : 0);
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62 postEvent(ev);
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63 }
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64
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65 MIDIEvent
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66 MIDIInput::readEvent()
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67 {
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68 MIDIEvent *event = m_buffer.readOne();
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69 MIDIEvent revent = *event;
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70 delete event;
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71 return revent;
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72 }
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73
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74 void
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75 MIDIInput::postEvent(MIDIEvent e)
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76 {
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77 int count = 0, max = 5;
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78 while (m_buffer.getWriteSpace() == 0) {
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79 if (count == max) {
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80 std::cerr << "ERROR: MIDIInput::postEvent: MIDI event queue is full and not clearing -- abandoning incoming event" << std::endl;
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81 return;
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82 }
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83 std::cerr << "WARNING: MIDIInput::postEvent: MIDI event queue (capacity " << m_buffer.getSize() << " is full!" << std::endl;
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84 std::cerr << "Waiting for something to be processed" << std::endl;
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85 #ifdef _WIN32
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86 Sleep(1);
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87 #else
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88 sleep(1);
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89 #endif
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90 count++;
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91 }
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92
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93 MIDIEvent *me = new MIDIEvent(e);
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94 m_buffer.write(&me, 1);
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95 emit eventsAvailable();
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96 }
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97
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