Mercurial > hg > svcore
view data/midi/MIDIInput.cpp @ 1500:9d37c8cf9686 avoid-pointer-keys
Provide model id
author | Chris Cannam |
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date | Mon, 13 Aug 2018 16:45:29 +0100 |
parents | cee1be4fb8c1 |
children | 70e172e6cc59 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006-2009 Chris Cannam and QMUL. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #include "MIDIInput.h" #include "rtmidi/RtMidi.h" #include "system/System.h" MIDIInput::MIDIInput(QString name, FrameTimer *timer) : m_rtmidi(0), m_frameTimer(timer), m_buffer(1023) { try { std::vector<RtMidi::Api> apis; RtMidi::getCompiledApi(apis); RtMidi::Api preferredApi = RtMidi::UNSPECIFIED; for (auto a: apis) { if (a == RtMidi::UNSPECIFIED || a == RtMidi::RTMIDI_DUMMY) { continue; } preferredApi = a; break; } if (preferredApi == RtMidi::UNSPECIFIED) { SVCERR << "ERROR: MIDIInput: No RtMidi APIs compiled in" << endl; } else { m_rtmidi = new RtMidiIn(preferredApi, name.toStdString()); int n = m_rtmidi->getPortCount(); if (n == 0) { SVDEBUG << "NOTE: MIDIInput: No input ports available" << endl; delete m_rtmidi; m_rtmidi = 0; } else { m_rtmidi->setCallback(staticCallback, this); SVDEBUG << "MIDIInput: Available ports are:" << endl; for (int i = 0; i < n; ++i) { SVDEBUG << i << ". " << m_rtmidi->getPortName(i) << endl; } SVDEBUG << "MIDIInput: Using first port (\"" << m_rtmidi->getPortName(0) << "\")" << endl; m_rtmidi->openPort(0, tr("Input").toStdString()); } } } catch (const RtMidiError &e) { SVCERR << "ERROR: RtMidi error: " << e.getMessage() << endl; delete m_rtmidi; m_rtmidi = 0; } } MIDIInput::~MIDIInput() { delete m_rtmidi; } void MIDIInput::staticCallback(double timestamp, std::vector<unsigned char> *message, void *userData) { ((MIDIInput *)userData)->callback(timestamp, message); } void MIDIInput::callback(double timestamp, std::vector<unsigned char> *message) { SVDEBUG << "MIDIInput::callback(" << timestamp << ")" << endl; // In my experience so far, the timings passed to this function // are not reliable enough to use. We request instead an audio // frame time from whatever FrameTimer we have been given, and use // that as the event time. if (!message || message->empty()) return; unsigned long t = m_frameTimer->getFrame(); MIDIByte code = (*message)[0]; MIDIEvent ev(t, code, message->size() > 1 ? (*message)[1] : 0, message->size() > 2 ? (*message)[2] : 0); postEvent(ev); } MIDIEvent MIDIInput::readEvent() { MIDIEvent *event = m_buffer.readOne(); MIDIEvent revent = *event; delete event; return revent; } void MIDIInput::postEvent(MIDIEvent e) { int count = 0, max = 5; while (m_buffer.getWriteSpace() == 0) { if (count == max) { SVCERR << "ERROR: MIDIInput::postEvent: MIDI event queue is full and not clearing -- abandoning incoming event" << endl; return; } SVCERR << "WARNING: MIDIInput::postEvent: MIDI event queue (capacity " << m_buffer.getSize() << " is full!" << endl; SVDEBUG << "Waiting for something to be processed" << endl; #ifdef _WIN32 Sleep(1); #else sleep(1); #endif count++; } MIDIEvent *me = new MIDIEvent(e); m_buffer.write(&me, 1); emit eventsAvailable(); }