annotate data/midi/MIDIInput.cpp @ 724:7eb389da7976

Fix cppcheck warnings
author Chris Cannam
date Fri, 18 May 2012 09:48:19 +0100
parents 1424aa29ae95
children e802e550a1f2
rev   line source
Chris@562 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@562 2
Chris@562 3 /*
Chris@562 4 Sonic Visualiser
Chris@562 5 An audio file viewer and annotation editor.
Chris@562 6 Centre for Digital Music, Queen Mary, University of London.
Chris@562 7 This file copyright 2006-2009 Chris Cannam and QMUL.
Chris@562 8
Chris@562 9 This program is free software; you can redistribute it and/or
Chris@562 10 modify it under the terms of the GNU General Public License as
Chris@562 11 published by the Free Software Foundation; either version 2 of the
Chris@562 12 License, or (at your option) any later version. See the file
Chris@562 13 COPYING included with this distribution for more information.
Chris@562 14 */
Chris@562 15
Chris@562 16 #include "MIDIInput.h"
Chris@562 17
Chris@562 18 #include "rtmidi/RtMidi.h"
Chris@562 19
Chris@608 20 #include <unistd.h>
Chris@608 21
Chris@567 22 MIDIInput::MIDIInput(QString name, FrameTimer *timer) :
Chris@562 23 m_rtmidi(),
Chris@567 24 m_frameTimer(timer),
Chris@562 25 m_buffer(1023)
Chris@562 26 {
Chris@562 27 try {
Chris@562 28 m_rtmidi = new RtMidiIn(name.toStdString());
Chris@562 29 m_rtmidi->setCallback(staticCallback, this);
Chris@565 30 m_rtmidi->openPort(0, tr("Input").toStdString());
Chris@562 31 } catch (RtError e) {
Chris@562 32 e.printMessage();
Chris@562 33 delete m_rtmidi;
Chris@562 34 m_rtmidi = 0;
Chris@562 35 }
Chris@562 36 }
Chris@562 37
Chris@562 38 MIDIInput::~MIDIInput()
Chris@562 39 {
Chris@562 40 delete m_rtmidi;
Chris@562 41 }
Chris@562 42
Chris@562 43 void
Chris@562 44 MIDIInput::staticCallback(double timestamp, std::vector<unsigned char> *message,
Chris@562 45 void *userData)
Chris@562 46 {
Chris@562 47 ((MIDIInput *)userData)->callback(timestamp, message);
Chris@562 48 }
Chris@562 49
Chris@562 50 void
Chris@562 51 MIDIInput::callback(double timestamp, std::vector<unsigned char> *message)
Chris@562 52 {
Chris@690 53 SVDEBUG << "MIDIInput::callback(" << timestamp << ")" << endl;
Chris@567 54 // In my experience so far, the timings passed to this function
Chris@567 55 // are not reliable enough to use. We request instead an audio
Chris@567 56 // frame time from whatever FrameTimer we have been given, and use
Chris@567 57 // that as the event time.
Chris@566 58 if (!message || message->empty()) return;
Chris@567 59 unsigned long t = m_frameTimer->getFrame();
Chris@569 60 MIDIByte code = (*message)[0];
Chris@567 61 MIDIEvent ev(t,
Chris@569 62 code,
Chris@566 63 message->size() > 1 ? (*message)[1] : 0,
Chris@566 64 message->size() > 2 ? (*message)[2] : 0);
Chris@566 65 postEvent(ev);
Chris@562 66 }
Chris@562 67
Chris@562 68 MIDIEvent
Chris@562 69 MIDIInput::readEvent()
Chris@562 70 {
Chris@562 71 MIDIEvent *event = m_buffer.readOne();
Chris@562 72 MIDIEvent revent = *event;
Chris@562 73 delete event;
Chris@562 74 return revent;
Chris@562 75 }
Chris@562 76
Chris@562 77 void
Chris@562 78 MIDIInput::postEvent(MIDIEvent e)
Chris@562 79 {
Chris@562 80 int count = 0, max = 5;
Chris@562 81 while (m_buffer.getWriteSpace() == 0) {
Chris@562 82 if (count == max) {
Chris@562 83 std::cerr << "ERROR: MIDIInput::postEvent: MIDI event queue is full and not clearing -- abandoning incoming event" << std::endl;
Chris@562 84 return;
Chris@562 85 }
Chris@562 86 std::cerr << "WARNING: MIDIInput::postEvent: MIDI event queue (capacity " << m_buffer.getSize() << " is full!" << std::endl;
Chris@690 87 SVDEBUG << "Waiting for something to be processed" << endl;
Chris@562 88 #ifdef _WIN32
Chris@562 89 Sleep(1);
Chris@562 90 #else
Chris@562 91 sleep(1);
Chris@562 92 #endif
Chris@562 93 count++;
Chris@562 94 }
Chris@562 95
Chris@562 96 MIDIEvent *me = new MIDIEvent(e);
Chris@562 97 m_buffer.write(&me, 1);
Chris@562 98 emit eventsAvailable();
Chris@562 99 }
Chris@562 100