Chris@562: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@562: 
Chris@562: /*
Chris@562:     Sonic Visualiser
Chris@562:     An audio file viewer and annotation editor.
Chris@562:     Centre for Digital Music, Queen Mary, University of London.
Chris@562:     This file copyright 2006-2009 Chris Cannam and QMUL.
Chris@562:     
Chris@562:     This program is free software; you can redistribute it and/or
Chris@562:     modify it under the terms of the GNU General Public License as
Chris@562:     published by the Free Software Foundation; either version 2 of the
Chris@562:     License, or (at your option) any later version.  See the file
Chris@562:     COPYING included with this distribution for more information.
Chris@562: */
Chris@562: 
Chris@562: #include "MIDIInput.h"
Chris@562: 
Chris@562: #include "rtmidi/RtMidi.h"
Chris@562: 
Chris@1219: #include "system/System.h"
Chris@608: 
Chris@567: MIDIInput::MIDIInput(QString name, FrameTimer *timer) :
Chris@562:     m_rtmidi(),
Chris@567:     m_frameTimer(timer),
Chris@562:     m_buffer(1023)
Chris@562: {
Chris@562:     try {
Chris@562:         m_rtmidi = new RtMidiIn(name.toStdString());
Chris@562:         m_rtmidi->setCallback(staticCallback, this);
Chris@565:         m_rtmidi->openPort(0, tr("Input").toStdString());
Chris@562:     } catch (RtError e) {
Chris@562:         e.printMessage();
Chris@562:         delete m_rtmidi;
Chris@562:         m_rtmidi = 0;
Chris@562:     }
Chris@562: }
Chris@562: 
Chris@562: MIDIInput::~MIDIInput()
Chris@562: {
Chris@562:     delete m_rtmidi;
Chris@562: }
Chris@562: 
Chris@562: void
Chris@562: MIDIInput::staticCallback(double timestamp, std::vector<unsigned char> *message,
Chris@562:                           void *userData)
Chris@562: {
Chris@562:     ((MIDIInput *)userData)->callback(timestamp, message);
Chris@562: }
Chris@562: 
Chris@562: void
Chris@562: MIDIInput::callback(double timestamp, std::vector<unsigned char> *message)
Chris@562: {
Chris@690:     SVDEBUG << "MIDIInput::callback(" << timestamp << ")" << endl;
Chris@567:     // In my experience so far, the timings passed to this function
Chris@567:     // are not reliable enough to use.  We request instead an audio
Chris@567:     // frame time from whatever FrameTimer we have been given, and use
Chris@567:     // that as the event time.
Chris@566:     if (!message || message->empty()) return;
Chris@567:     unsigned long t = m_frameTimer->getFrame();
Chris@569:     MIDIByte code = (*message)[0];
Chris@567:     MIDIEvent ev(t,
Chris@569:                  code,
Chris@566:                  message->size() > 1 ? (*message)[1] : 0,
Chris@566:                  message->size() > 2 ? (*message)[2] : 0);
Chris@566:     postEvent(ev);
Chris@562: }
Chris@562: 
Chris@562: MIDIEvent
Chris@562: MIDIInput::readEvent()
Chris@562: {
Chris@562:     MIDIEvent *event = m_buffer.readOne();
Chris@562:     MIDIEvent revent = *event;
Chris@562:     delete event;
Chris@562:     return revent;
Chris@562: }
Chris@562: 
Chris@562: void
Chris@562: MIDIInput::postEvent(MIDIEvent e)
Chris@562: {
Chris@562:     int count = 0, max = 5;
Chris@562:     while (m_buffer.getWriteSpace() == 0) {
Chris@562:         if (count == max) {
Chris@843:             cerr << "ERROR: MIDIInput::postEvent: MIDI event queue is full and not clearing -- abandoning incoming event" << endl;
Chris@562:             return;
Chris@562:         }
Chris@843:         cerr << "WARNING: MIDIInput::postEvent: MIDI event queue (capacity " << m_buffer.getSize() << " is full!" << endl;
Chris@690:         SVDEBUG << "Waiting for something to be processed" << endl;
Chris@562: #ifdef _WIN32
Chris@562:         Sleep(1);
Chris@562: #else
Chris@562:         sleep(1);
Chris@562: #endif
Chris@562:         count++;
Chris@562:     }
Chris@562: 
Chris@562:     MIDIEvent *me = new MIDIEvent(e);
Chris@562:     m_buffer.write(&me, 1);
Chris@562:     emit eventsAvailable();
Chris@562: }
Chris@562: