Play midi file .. problem 4.8.6

[SherifOmran]

Hello guys,

i had a program that was programmed under mac and it worked fine but now i am testing it under windows
my problem is that i need to play a midi file .. I use the following way, when i emit the startbackgroundsound signal

@
qDebug() << "background sound = " << bgsound;
// ouput = background sound = "C:\Users\Sherif\AppData\Local\login\spacegamebackground.mid"

QPointer <QSound> backgroundsound = new QSound(bgsound);
QObject::connect(this,SIGNAL(StartBackGroundSoundSignal()),backgroundsound.data(),SLOT(play()));

emit(StartBackGroundSoundSignal());

@

what happens is that it beeps and does not play it ..
Could it be that there is a missing file? I am running from inside QT .. !!

please advice ..

thanks

[SGaist]

Hi,

Are you really passing

@ "C:\Users\Sherif\AppData\Local\login\spacegamebackground.mid"@

as path ?

If so you must either escape the backslashes or even better, since you are using Qt, use the forward slash *nix notation.

Hope it helps

[SherifOmran]

I could not solve the issue .. any help? I tested again under MAC but does not play any more

mainwindow.cpp
@
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPointer>
#include <QSound>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

QPointer <QSound> backgroundsound = new QSound("/Volumes/DATA/Win/bp.mid");
// connect background signal
backgroundsound->play();

}

MainWindow::~MainWindow()
{
delete ui;
}
@

mainwindow.h
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QWidget>
#include <QtCore>
#include <QtGui>

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QPointer <QSound> backgroundsound ;

private:
Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H
@

[andreyc]

The "description":http://qt-project.org/doc/qt-4.8/qsound.html#details says that on Windows QSound supports only WAV format.
And on MacOSX it supports whatever NSSound supports, which I guess, includes MIDI.

[SherifOmran]

thanks for the info, but do you know how can i play a midi file?

[utcenter]

You can use libraries like RTMIDI to read the actual midi, but you will still have to find a way to produce actual musical notes from the midi data, look for some synthesizer libraries.

[SherifOmran]

I found the following code online. I need to convert this form into a normal .h file so that i can include it as a class in any c file. I don't know this syntax and when i made a header file out of it, it did not work .. Could any body help? thank ..

@
/*

• QtPlaySMF
• Part of QtMidi (http://github.com/waddlesplash/qtmidi).
• Copyright (c) 2003-2012 by David G. Slomin
• Copyright (c) 2012 WaddleSplash
• Permission is hereby granted, free of charge, to any person obtaining
• a copy of this software and associated documentation files (the "Software"),
• to deal in the Software without restriction, including without limitation
• the rights to use, copy, modify, merge, publish, distribute, sublicense,
• and/or sell copies of the Software, and to permit persons to whom the Software
• is furnished to do so, subject to the following conditions:
• The above copyright notice and this permission notice shall
• be included in all copies or substantial portions of the Software.
• THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
• EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
• OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
• IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
• DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
• ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
• DEALINGS IN THE SOFTWARE.

*/

#include <stdio.h>
#include <QThread>
#include <QElapsedTimer>
#include <QCoreApplication>
#include <QMidiOut.h>
#include <QMidiFile.h>

class MidiPlayer : public QThread
{
Q_OBJECT
public:
MidiPlayer(QMidiFile* file, QMidiOut* out)
{ midi_file = file; midi_out = out; }
//MidiPlayer();

void play();

private:
QMidiEvent* midi_file_event;
QMidiFile* midi_file;
QMidiOut* midi_out;

protected:
void run()
{
QElapsedTimer t;
t.start();
QList<QMidiEvent*>* events = midi_file->events();
for(int i = 0; i < events->count(); i++)
{
midi_file_event = events->at(i);
if (midi_file_event->type() != QMidiEvent::Meta)
{
qint64 event_time = midi_file->timeFromTick(midi_file_event->tick()) * 1000;

            qint32 waitTime = event_time - t.elapsed();
            if(waitTime > 0) {
                msleep(waitTime);
            }
            handleEvent();
        }
    }

    midi_out->disconnect();
}

private slots:
void handleEvent()
{
if (midi_file_event->type() == QMidiEvent::SysEx)
{ // TODO: sysex
}
else
{
qint32 message = midi_file_event->message();
midi_out->sendMsg(message);
}
}
};

void MidiPlayer::play()
{
QString filename = "D:/Release/Win/bg.mid";
QString midiOutName = "";
QMidiFile* midi_file = new QMidiFile();
midi_file->load(filename);

QMidiOut* midi_out = new QMidiOut();
midi_out->connect(midiOutName);
MidiPlayer* p = new MidiPlayer(midi_file,midi_out);
p->start();

}
#include "playsmf.moc"

int main(int argc, char *argv[])
{
QCoreApplication a(argc,argv);

MidiPlayer *aa;
aa->play();

//QObject::connect(p,SIGNAL(finished()),&a,SLOT(quit()));

return a.exec();

}

@

[SherifOmran]

Here is my header file and c file

problem: prototype does not match

@

#ifndef MIDICLASS_H
#define MIDICLASS_H

#include <stdio.h>
#include <QThread>
#include <QElapsedTimer>
#include <QCoreApplication>
#include <QMidiOut.h>
#include <QMidiFile.h>

class midiclass : public QThread
{
Q_OBJECT
public:
explicit midiclass(QMidiFile* file, QMidiOut* out)
{ midi_file = file; midi_out = out; }
//MidiPlayer();

void play();

private:
QMidiEvent* midi_file_event;
QMidiFile* midi_file;
QMidiOut* midi_out;

signals:
protected:
void run()
{
QElapsedTimer t;
t.start();
QList<QMidiEvent*>* events = midi_file->events();
for(int i = 0; i < events->count(); i++)
{
midi_file_event = events->at(i);
if (midi_file_event->type() != QMidiEvent::Meta)
{
qint64 event_time = midi_file->timeFromTick(midi_file_event->tick()) * 1000;

            qint32 waitTime = event_time - t.elapsed();
            if(waitTime > 0) {
                msleep(waitTime);
            }
            handleEvent();
        }
    }

    midi_out->disconnect();
}

private slots:
void handleEvent()
{
if (midi_file_event->type() == QMidiEvent::SysEx)
{ // TODO: sysex
}
else
{
qint32 message = midi_file_event->message();
midi_out->sendMsg(message);
}
}
};

#endif // MIDICLASS_H

@

here is my .c file

@
#include "midiclass.h"

midiclass::midiclass(QThread *parent) :
QObject(parent)
{

}

void midiclass::play()
{
QString filename = "D:/Activate Software/typing tutor MAC/login/Release/Win/bg.mid";
QString midiOutName = "";
QMidiFile* midi_file = new QMidiFile();
midi_file->load(filename);

QMidiOut* midi_out = new QMidiOut();
midi_out->connect(midiOutName);
MidiPlayer* p = new MidiPlayer(midi_file,midi_out);
p->start();

}

@

[SherifOmran]

any help