Simple drum patterns.
#include <QDebug>
#include <QInputDialog>
#include <QSettings>
#include <QShortcut>
#include <QToolTip>
#include <QtMath>
#include "drumgrid.h"
#include "drumgridabout.h"
#include "drumgridmodel.h"
#include "ui_drumgrid.h"
const QString DrumGrid::QSTR_WINDOW = QStringLiteral("Window");
const QString DrumGrid::QSTR_GEOMETRY = QStringLiteral("Geometry");
const QString DrumGrid::QSTR_STATE = QStringLiteral("State");
const QString DrumGrid::QSTR_MIDI = QStringLiteral("MIDI");
const QString DrumGrid::QSTR_CONNECTION = QStringLiteral("Connection");
const QString DrumGrid::QSTR_TEMPO = QStringLiteral("Tempo");
const QString DrumGrid::QSTR_PATTERN = QStringLiteral("Pattern");
const int DrumGrid::TEMPO_MIN = 25;
const int DrumGrid::TEMPO_MAX = 250;
const int DrumGrid::TEMPO_DEFAULT = 120;
const int DrumGrid::NOTE_DURATION = 10;
const int DrumGrid::METRONOME_CHANNEL = 9;
const int DrumGrid::METRONOME_VELOCITY = 100;
const int DrumGrid::METRONOME_PROGRAM = 0;
const int DrumGrid::METRONOME_RESOLUTION = 120;
const int DrumGrid::METRONOME_VOLUME = 100;
const int DrumGrid::METRONOME_PAN = 64;
const int DrumGrid::VOLUME_CC = 7;
const int DrumGrid::PAN_CC = 10;
DrumGrid::DrumGrid(QWidget *parent)
: QMainWindow(parent),
m_ui(new Ui::DrumGrid),
m_clientId(-1),
m_portId(-1),
m_queueId(-1),
m_tick(0),
m_weak_velocity(METRONOME_VELOCITY / 2),
m_strong_velocity(METRONOME_VELOCITY),
m_program(METRONOME_PROGRAM),
m_channel(METRONOME_CHANNEL),
m_volume(METRONOME_VOLUME),
m_pan(METRONOME_PAN),
m_resolution(METRONOME_RESOLUTION),
m_bpm(TEMPO_DEFAULT),
m_noteDuration(NOTE_DURATION),
m_autoconnect(false),
m_playing(false),
m_useNoteOff(true)
{
m_ui->setupUi(this);
m_ui->startButton->setIcon(style()->standardIcon(QStyle::StandardPixmap(QStyle::SP_MediaPlay)));
m_ui->startButton->setShortcut(Qt::Key_MediaPlay);
m_ui->stopButton->setIcon(style()->standardIcon(QStyle::StandardPixmap(QStyle::SP_MediaStop)));
m_ui->stopButton->setShortcut(Qt::Key_MediaStop);
m_ui->tempoSlider->setMaximum(TEMPO_MAX);
m_ui->tempoSlider->setMinimum(TEMPO_MIN);
m_ui->tempoSlider->setValue(m_bpm);
connect( m_ui->actionAbout, &QAction::triggered, this, &DrumGrid::slotAbout);
connect( m_ui->actionAbout_Qt, &QAction::triggered, qApp, &QApplication::aboutQt);
connect( m_ui->actionQuit, &QAction::triggered, this, &DrumGrid::close);
connect( m_ui->actionConnect, &QAction::triggered, this, &DrumGrid::connectMidi);
connect( m_ui->startButton, &QPushButton::clicked, this, &DrumGrid::play);
connect( m_ui->stopButton, &QPushButton::clicked, this, &DrumGrid::stop);
connect( m_ui->tempoSlider, &QSlider::valueChanged, this, &DrumGrid::tempoChange);
connect( m_ui->gridColumns, QOverload<int>::of(&QSpinBox::valueChanged), this, &DrumGrid::gridColumns);
m_model = new DrumGridModel(this);
m_model->fillSampleData();
m_ui->tableView->setModel(m_model);
connect ( this, &DrumGrid::signalUpdate, this, &DrumGrid::updateDisplay );
addShortcut(QKeySequence(Qt::Key_F), "f");
addShortcut(QKeySequence(Qt::Key_P), "p");
addShortcut(QKeySequence(Qt::Key_1), "1");
addShortcut(QKeySequence(Qt::Key_2), "2");
addShortcut(QKeySequence(Qt::Key_3), "3");
addShortcut(QKeySequence(Qt::Key_4), "4");
addShortcut(QKeySequence(Qt::Key_5), "5");
addShortcut(QKeySequence(Qt::Key_6), "6");
addShortcut(QKeySequence(Qt::Key_7), "7");
addShortcut(QKeySequence(Qt::Key_8), "8");
addShortcut(QKeySequence(Qt::Key_9), "9");
addShortcut(QKeySequence(Qt::Key_0), QString());
addShortcut(QKeySequence::Delete, QString());
connect ( m_ui->tableView, &QTableView::doubleClicked, m_model,
QOverload<const QModelIndex &>::of(&DrumGridModel::changeCell) );
m_Client->open();
m_Client->setClientName("DrumGrid");
connect( m_Client, &MidiClient::eventReceived, this, &DrumGrid::sequencerEvent, Qt::QueuedConnection );
m_Port->attach( m_Client );
m_Port->setPortName("DrumGrid Output Port");
m_Port->setCapability( SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_READ );
m_Port->setPortType( SND_SEQ_PORT_TYPE_APPLICATION |
SND_SEQ_PORT_TYPE_MIDI_GENERIC );
m_Queue = m_Client->createQueue("DrumGrid");
m_queueId = m_Queue->getId();
m_portId = m_Port->getPortId();
m_clientId = m_Client->getClientId();
m_Client->setRealTimeInput(false);
m_Client->startSequencerInput();
readSettings();
updateView();
}
DrumGrid::~DrumGrid()
{
foreach(QShortcut* s, m_shortcuts)
delete s;
m_Port->detach();
m_Client->close();
delete m_ui;
}
void DrumGrid::updateView()
{
m_ui->tableView->resizeColumnsToContents();
m_ui->tableView->resizeRowsToContents();
}
void DrumGrid::subscribe(const QString& portName)
{
try {
if (!m_subscription.isEmpty()) {
m_Port->unsubscribeTo(m_subscription);
m_subscription.clear();
}
m_Port->subscribeTo(portName);
m_subscription = portName;
qWarning() <<
"SequencerError exception. Error code: " << err.
code()
qWarning() <<
"Location: " << err.
location();
}
}
void DrumGrid::connectMidi()
{
bool ok;
int current;
QStringList items;
QListIterator<PortInfo> it(m_Client->getAvailableOutputs());
while(it.hasNext()) {
}
current = items.indexOf(m_subscription);
QString item = QInputDialog::getItem(this, "MIDI port subscription",
"Output port:", items,
current, false, &ok);
if (ok && !item.isEmpty()) {
subscribe(item);
}
}
{
case SND_SEQ_EVENT_USR0:
m_bar++;
m_beat = 0;
break;
case SND_SEQ_EVENT_USR1:
m_beat++;
Q_EMIT signalUpdate(m_bar, m_beat-1);
break;
}
delete ev;
}
void DrumGrid::play()
{
metronome_set_tempo();
metronome_start();
}
void DrumGrid::stop()
{
metronome_stop();
}
void DrumGrid::tempoChange(int newTempo)
{
QString tip = QString::number(newTempo);
m_bpm = newTempo;
metronome_set_tempo();
m_ui->tempoSlider->setToolTip(tip);
QToolTip::showText(QCursor::pos(), tip, this);
}
void DrumGrid::gridColumns(int columns)
{
m_model->updatePatternColumns(columns);
updateView();
}
void DrumGrid::shortcutPressed(const QString& value)
{
QModelIndex index = m_ui->tableView->currentIndex();
m_model->changeCell(index, value);
}
void DrumGrid::addShortcut(const QKeySequence& key, const QString& value)
{
QShortcut* shortcut = new QShortcut(key, m_ui->tableView);
connect(shortcut, &QShortcut::activated, this, [=]{ shortcutPressed(value); });
m_shortcuts.append(shortcut);
}
void DrumGrid::readSettings()
{
settings.beginGroup(QSTR_WINDOW);
restoreGeometry(settings.value(QSTR_GEOMETRY).toByteArray());
restoreState(settings.value(QSTR_STATE).toByteArray());
settings.endGroup();
settings.beginGroup(QSTR_MIDI);
QString midiConn = settings.value(QSTR_CONNECTION).toString();
m_bpm = settings.value(QSTR_TEMPO, TEMPO_DEFAULT).toInt();
settings.endGroup();
if (midiConn.length() > 0) {
subscribe(midiConn);
}
settings.beginGroup(QSTR_PATTERN);
QStringList keys = settings.allKeys();
if (!keys.empty()) {
keys.sort();
m_model->clearPattern();
foreach(const QString& key, keys) {
QStringList row = settings.value(key).toStringList();
m_model->addPatternData(key.toInt(), row);
}
m_model->endOfPattern();
}
settings.endGroup();
}
void DrumGrid::writeSettings()
{
settings.clear();
settings.beginGroup(QSTR_WINDOW);
settings.setValue(QSTR_GEOMETRY, saveGeometry());
settings.setValue(QSTR_STATE, saveState());
settings.endGroup();
settings.beginGroup(QSTR_MIDI);
settings.setValue(QSTR_CONNECTION, m_subscription);
settings.setValue(QSTR_TEMPO, m_bpm);
settings.endGroup();
settings.beginGroup(QSTR_PATTERN);
for(int r = 0; r < m_model->rowCount(); ++r) {
settings.setValue( m_model->patternKey(r),
m_model->patternData(r) );
}
settings.endGroup();
settings.sync();
}
void DrumGrid::closeEvent( QCloseEvent *event )
{
writeSettings();
event->accept();
}
{
m_Client->outputDirect(ev);
}
void DrumGrid::sendControlChange(int cc, int value)
{
metronome_event_output(&ev);
}
void DrumGrid::sendInitialControls()
{
metronome_set_program();
metronome_set_controls();
metronome_set_tempo();
}
void DrumGrid::metronome_set_program()
{
metronome_event_output(&ev);
}
{
else
m_Client->outputDirect(ev);
}
void DrumGrid::metronome_note(int note, int vel, int tick)
{
if (m_useNoteOff) {
NoteEvent ev(m_channel, note, vel, m_noteDuration);
metronome_schedule_event(&ev, tick);
} else {
metronome_schedule_event(&ev, tick);
}
}
void DrumGrid::metronome_echo(int tick, int ev_type)
{
metronome_schedule_event(&ev, tick);
}
int DrumGrid::decodeVelocity(const QString drumVel)
{
const qreal f = 127.0 / 9.0;
int num = 0;
bool isNum = false;
if (drumVel.isEmpty())
return 0;
if (drumVel == "f")
return m_strong_velocity;
else if (drumVel == "p")
return m_weak_velocity;
num = drumVel.toInt(&isNum);
if (isNum)
return qRound(f * num);
return 0;
}
void DrumGrid::metronome_pattern(int tick)
{
int i, j, t, duration, key, vel;
t = tick;
duration = m_resolution / 4;
for(i=0; i<m_model->columnCount(); ++i) {
for(j=0; j<m_model->rowCount(); ++j) {
QString n = m_model->patternHit(j, i);
if (!n.isEmpty()) {
key = m_model->patternKey(j).toInt();
vel = decodeVelocity(n);
metronome_note(key, vel, t);
}
}
metronome_echo(t, SND_SEQ_EVENT_USR1);
t += duration;
}
metronome_echo(t, SND_SEQ_EVENT_USR0);
}
void DrumGrid::metronome_set_tempo()
{
m_Queue->setTempo(t);
m_Client->drainOutput();
}
void DrumGrid::metronome_set_controls()
{
sendControlChange(VOLUME_CC, m_volume);
sendControlChange(PAN_CC, m_pan);
}
void DrumGrid::metronome_start()
{
m_Queue->start();
m_patternDuration = m_resolution * m_model->columnCount() / 4;
metronome_pattern(0);
m_bar = 1;
m_beat = 0;
m_playing = true;
}
void DrumGrid::metronome_stop()
{
m_Queue->stop();
m_playing = false;
}
void DrumGrid::updateDisplay(int , int beat)
{
m_ui->tableView->selectColumn(beat);
}
void DrumGrid::slotAbout()
{
About dlgAbout(this);
dlgAbout.exec();
}
Classes managing ALSA Sequencer clients.
Classes managing ALSA Sequencer events.
Classes managing ALSA Sequencer ports.
Classes managing ALSA Sequencer queues.
The QSettings class provides persistent platform-independent application settings.
Event representing a MIDI control change event.
Class representing a note event with duration.
Event representing a note-on MIDI event.
Port information container.
QString getClientName() const
Gets the client name.
int getPort()
Gets the port number.
Event representing a MIDI program change event.
void setPPQ(int value)
Sets the queue resolution in parts per quarter note.
unsigned int getTempo()
Gets the queue's tempo in microseconds per beat.
void setNominalBPM(float value)
Sets the queue's nominal tempo in BPM (beats per minute).
Exception class for ALSA Sequencer errors.
void scheduleTick(const int queue, const int tick, const bool relative)
Sets the event to be scheduled in musical time (ticks) units.
void setDirect()
Sets the event to be immediately delivered, not queued/scheduled.
snd_seq_tick_time_t getTick() const
Gets the tick time of the event.
void setSubscribers()
Sets the event's destination to be all the subscribers of the source port.
void setDestination(const unsigned char client, const unsigned char port)
Sets the client:port destination of the event.
void setSource(const unsigned char port)
Sets the event's source port ID.
snd_seq_event_type_t getSequencerType() const
Gets the sequencer event type.
QString qstrError() const
Gets the human readable error message from the error code.
int code() const
Gets the numeric error code.
const QString & location() const
Gets the location of the error code as provided in the constructor.
Drumstick ALSA library wrapper.
SequencerError Exception class.