【基于树莓派400的图像识别归类&运动检测&模拟信号处理系统第四帖】尝试做个MP3播...

donatello1996

【基于树莓派400的图像识别归类&运动检测&模拟信号处理系统第四帖】尝试做个MP3播... [复制链接]

 

      这个播放器呢原本是对音频做频谱信号分析用的，后面发现项目其实不一定用得上，于是乎就做了个小小的，简单的音乐播放器，用madplay实现，就当作是项目中的娱乐小插曲。MP3播放器非常简单，可以用ffmjpeg-streamer或者madplay实现：

然后在qt程序中也可以通过system()接口实现调用外部程序，再结合文件夹路径递归操作接口，就能做一个简单的MP3播放器：

static QStringList fileNames_temp , fileNames_norepeat;

void MainWindow::on_PB_MP3_SELECT_clicked()
{
    QFileDialog *fileDialog = new QFileDialog(this);
    fileDialog->setWindowTitle(QStringLiteral("Select mp3 file(s)"));

    fileDialog->setDirectory("./");

    fileDialog->setNameFilter(tr("File(*.mp3*)"));

    fileDialog->setFileMode(QFileDialog::ExistingFiles);

    fileDialog->setViewMode(QFileDialog::Detail);
    QStringList fileNames;
    if (fileDialog->exec())
    {
        fileNames = fileDialog->selectedFiles();
        ui->LE_MP3->setText(fileNames[0]);
    }

    fileNames_temp += fileNames;

    for(int i = 0; i < fileNames_temp.length(); i++)
    {
       if(!fileNames_norepeat.contains(fileNames_temp[i]))
       {
          fileNames_norepeat.append(fileNames_temp[i]);
       }
    }
    fileNames_temp.clear();
    fileNames_temp = fileNames_norepeat;

    ui->listWidget->clear();
    ui->listWidget->addItems(fileNames_norepeat);

    delete fileDialog;
}

void MainWindow::on_PB_MP3_PLAY_clicked()
{
    system("killall -KILL madplay &");
    sleep(1);
    QString qs1 = "madplay " + ui->LE_MP3->text() + " &";
    system(qs1.toLatin1().data());
    on_PB_MP3_PAUSE_clicked_1();
}

void MainWindow::on_PB_MP3_PAUSE_clicked_1()
{
    system("killall -CONT madplay &");
    ui->PB_MP3_PAUSE->setText("PAUSE");
    disconnect(ui->PB_MP3_PAUSE,SIGNAL(clicked()),this,SLOT(on_PB_MP3_PAUSE_clicked_1()));
    connect(ui->PB_MP3_PAUSE,SIGNAL(clicked()),this,SLOT(on_PB_MP3_PAUSE_clicked()));
}

void MainWindow::on_PB_MP3_PAUSE_clicked()
{
    system("killall -STOP madplay &");
    ui->PB_MP3_PAUSE->setText("CONT");
    disconnect(ui->PB_MP3_PAUSE,SIGNAL(clicked()),this,SLOT(on_PB_MP3_PAUSE_clicked()));
    connect(ui->PB_MP3_PAUSE,SIGNAL(clicked()),this,SLOT(on_PB_MP3_PAUSE_clicked_1()));
}

void MainWindow::on_listWidget_clicked(const QModelIndex &index)
{
    ui->LE_MP3->setText(ui->listWidget->currentItem()->text());
}

void MainWindow::on_listWidget_doubleClicked(const QModelIndex &index)
{
    ui->LE_MP3->setText(ui->listWidget->currentItem()->text());
    on_PB_MP3_PLAY_clicked();
}

void MainWindow::on_PB_MP3_PREV_clicked()
{
    if(ui->listWidget->currentItem() != nullptr)
    {
        int index = ui->listWidget->currentRow();
        if(index > 0)
            index --;
        if(index < 0)
            index = ui->listWidget->count() - 1;
        ui->listWidget->setCurrentRow(index);
        ui->LE_MP3->setText(ui->listWidget->currentItem()->text());
        on_PB_MP3_PLAY_clicked();
    }
}

void MainWindow::on_PB_MP3_NEXT_clicked()
{
    if(ui->listWidget->currentItem() != nullptr)
    {
        int index = ui->listWidget->currentRow();
        index ++;
        if(index >= ui->listWidget->count())
            index = 0;
        ui->listWidget->setCurrentRow(index);
        ui->LE_MP3->setText(ui->listWidget->currentItem()->text());
        on_PB_MP3_PLAY_clicked();
    }
}

 

e105994a816ccee8dfa9f0d13f4af5ea

 

Jacktang

用madplay实现MP3播放器效果还行