基于qt的音乐播放器源码

以下是一个基于Qt的简单音乐播放器示例代码：

mainwindow.h文件：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QMediaPlayer>
#include <QMediaPlaylist>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_actionOpen_triggered();

    void on_actionPlay_triggered();

    void on_actionStop_triggered();

    void on_actionPause_triggered();

    void on_actionNext_triggered();

    void on_actionPrevious_triggered();

    void on_actionMute_triggered();

    void on_actionVolumeUp_triggered();

    void on_actionVolumeDown_triggered();

    void on_positionChanged(qint64 position);

    void on_durationChanged(qint64 duration);

    void on_volumeChanged(int volume);

private:
    Ui::MainWindow *ui;
    QMediaPlayer *m_player;
    QMediaPlaylist *m_playlist;
};

#endif // MAINWINDOW_H

mainwindow.cpp文件：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <QMessageBox>

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

    m_player = new QMediaPlayer(this);
    m_playlist = new QMediaPlaylist(this);
    m_player->setPlaylist(m_playlist);

    connect(m_player, SIGNAL(positionChanged(qint64)), this, SLOT(on_positionChanged(qint64)));
    connect(m_player, SIGNAL(durationChanged(qint64)), this, SLOT(on_durationChanged(qint64)));
    connect(m_player, SIGNAL(volumeChanged(int)), this, SLOT(on_volumeChanged(int)));
}

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

void MainWindow::on_actionOpen_triggered()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), QString(), tr("Audio Files (*.mp3 *.wav)"));
    if (!fileName.isEmpty()) {
        m_playlist->addMedia(QUrl::fromLocalFile(fileName));
        m_player->setPlaylist(m_playlist);
        ui->statusBar->showMessage(tr("File loaded: %1").arg(fileName));
    }
}

void MainWindow::on_actionPlay_triggered()
{
    m_player->play();
}

void MainWindow::on_actionStop_triggered()
{
    m_player->stop();
}

void MainWindow::on_actionPause_triggered()
{
    m_player->pause();
}

void MainWindow::on_actionNext_triggered()
{
    m_playlist->next();
}

void MainWindow::on_actionPrevious_triggered()
{
    m_playlist->previous();
}

void MainWindow::on_actionMute_triggered()
{
    m_player->setMuted(!m_player->isMuted());
}

void MainWindow::on_actionVolumeUp_triggered()
{
    int volume = m_player->volume() + 10;
    if (volume > 100) {
        volume = 100;
    }
    m_player->setVolume(volume);
}

void MainWindow::on_actionVolumeDown_triggered()
{
    int volume = m_player->volume() - 10;
    if (volume < 0) {
        volume = 0;
    }
    m_player->setVolume(volume);
}

void MainWindow::on_positionChanged(qint64 position)
{
    ui->positionSlider->setValue(position);
}

void MainWindow::on_durationChanged(qint64 duration)
{
    ui->positionSlider->setRange(0, duration);
}

void MainWindow::on_volumeChanged(int volume)
{
    ui->volumeSlider->setValue(volume);
}

这个示例代码中包含了一个QMediaPlayer和一个QMediaPlaylist，可以播放MP3和WAV格式的音频文件。它包含了一些基本的功能，如打开、播放、暂停、停止、上一曲、下一曲、静音、音量调节等。你可以根据需要进行修改和扩展。