mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>
#include <QDebug>
#include <QDir>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    currentFile = "/home/luke/Music/Ott/Mir/02 Adrift In Hilbert Space.mp3"; // for faster iteration
 // currentFile = ""
    ui->label->setText("No File Selected");
}

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

void MainWindow::on_actionLoad_triggered()
{
    currentFile = QFileDialog::getOpenFileName(this,
                                               "open an audio file",
                                               QString(),
                                               QString(),
                                               nullptr,
                                               QFileDialog::DontUseNativeDialog);
    ui->label->setText(currentFile);
    ui->openGLWidget->newAudioFileFlag();
}

void MainWindow::on_playButton_clicked()
{
    if (QFile(currentFile).exists())
    {
        player.setMedia(QUrl::fromLocalFile(currentFile));
        player.setVolume(50);
        player.play();
    } else {
        ui->label->setText("Can't Play File");
    }
    if (probe.setSource(&player))
    {
        connect(&probe, SIGNAL(audioBufferProbed(QAudioBuffer)),
                ui->openGLWidget, SLOT(processAudioBuffer(QAudioBuffer)));
    }
}
void MainWindow::on_stopButton_clicked()
{
   player.stop();
}