项目实战——Qt实现FFmpeg音视频转码器（二）

// 拖拽操作---begin
void Widget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        m_bDrag = true;
        // 获得鼠标的初始位置
        mouseStartPoint = event->globalPos(); // 事件发生时鼠标相对于我们整个屏幕的左上角(0,0)的偏移值
        // mouseStartPoint = event->pos(); // 事件发生时鼠标相对于当前active widget的左上角(0,0)的偏移值
        // 获得窗口的初始位置
        windowTopLeftPoint = this->frameGeometry().topLeft(); // 仍然表示整个屏幕的左上角
        qDebug() << "mouseStartPoint" << mouseStartPoint.x() << mouseStartPoint.y();
        qDebug() << "windowTopLeftPoint" << windowTopLeftPoint.x() << windowTopLeftPoint.y();
    }
}
void Widget::mouseMoveEvent(QMouseEvent *event)
{
    if (m_bDrag) {
        // 获得鼠标移动的距离
        QPoint distance = event->globalPos() - mouseStartPoint;
        // QPoint distance = event->pos() - mouseStartPoint;
        // 改变窗口的位置
        this->move(windowTopLeftPoint + distance);
        qDebug() << "move" << windowTopLeftPoint + distance;
    }
}
void Widget::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        m_bDrag = false;
    }
}
// 拖拽操作--end

void Widget::on_pushButton_AddFile_clicked()
{
    // 定义文件对话框类
    QFileDialog *fileDialog = new QFileDialog(this);
    // 定义文件对话框标题
    fileDialog->setWindowTitle(tr("打开文件")); // tr()函数：Qt会根据当前的语言环境自动选择相应的翻译文件，并将字符串翻译成对应的语言。
    // 设置默认路径
    fileDialog->setDirectory(".");
    // 设置文件过滤器
    fileDialog->setNameFilter(tr("video(*.mp4 *.flv *.mkv);;All files(*.*)"));
    // 设置可以选择多个文件，默认只能选择一个文件 QFileDialog::ExistingFiles
    fileDialog->setFileMode(QFileDialog::ExistingFile);
    // 设置视图模式
    fileDialog->setViewMode(QFileDialog::Detail);
    if (fileDialog->exec()) {
        QString strFileName = fileDialog->selectedFiles()[0];
        qDebug() << strFileName;
        QFileInfo fileinfo;
        fileinfo = QFileInfo(strFileName);
        // 插入数据项
        ui->tableWidget_FileList->setRowCount(1);
        ui->tableWidget_FileList->setItem(0, 0, new QTableWidgetItem(fileinfo.fileName())); // 文件名
        ui->tableWidget_FileList->setItem(0, 1, new QTableWidgetItem(fileinfo.suffix()));   // 后缀
        AVGeneralMediaInfo avmi;
        std::string str = strFileName.toStdString();
        const char *chFilename = str.c_str();
        get_avgeneral_mediainfo(&avmi, chFilename);
        ui->tableWidget_FileList->setItem(0, 2, new QTableWidgetItem(QString(QLatin1String(avmi.videoCodecName))));
        ui->tableWidget_FileList->setItem(0, 3, new QTableWidgetItem(QString(QLatin1String(avmi.audioCodecName))));
        char chDuration[128] = {0};
        sprintf(chDuration, "%lld", avmi.duration);
        ui->tableWidget_FileList->setItem(0, 4, new QTableWidgetItem(QString(QLatin1String(chDuration))));
        ui->tableWidget_FileList->setItem(0, 5, new QTableWidgetItem(strFileName));
    }
}

#ifndef TCWORKTHREAD_H
#define TCWORKTHREAD_H
#include <QThread>
extern "C" {
#include "ffmpeg.h"
}
#define MAX_CMDLINE_ARGC_COUNT 100
// 转码参数
typedef struct __TCParams {
    char inFilename[512];
    char videoCodecName[256];
    char audioCodecName[256];
    char muxerName[256];
    // 定义了一个无参数的构造函数__TCParams()，在该构造函数中调用了一个名为__init()的私有成员函数。
    // 构造函数在创建结构体实例时会被自动调用，因此当创建TCParams对象时，会自动执行__init()函数。
    __TCParams() {
        __init();
    }
    void __init() {
        memset(inFilename, 0, 512);
        memset(videoCodecName, 0, 256);
        memset(audioCodecName, 0, 256);
        memset(muxerName, 0, 256);
    }
} TCParams;
class TCWorkThread : public QThread
{
public:
    TCWorkThread();
private:
    virtual void run(); // 任务处理线程
    TCParams *m_pTCParams;
public:
    int workCount;  // 计数
    void SetTCParams(TCParams *params);
signals:
public slots:
};

#include "tcworkthread.h"
#include <QDebug>
TCWorkThread::TCWorkThread()
{
    workCount = 0;
    m_pTCParams = nullptr;
}
void TCWorkThread::SetTCParams(TCParams *params)
{
    m_pTCParams = params;
}
// run() 重新实现
void TCWorkThread::run()
{
    if (m_pTCParams == nullptr) {
        return;
    }
    // by lp，参数都是写死的，仅供参考
    char* arrParams[MAX_CMDLINE_ARGC_COUNT] = { 0 };
    for (int k = 0; k < MAX_CMDLINE_ARGC_COUNT; k++) {
        arrParams[k] = new char[1024]();
    }
    char strOutName[512] = {0};
    strcpy(arrParams[0], "QtVideoConverter.exe");
    strcpy(arrParams[1], "-i");
    strcpy(arrParams[2], m_pTCParams->inFilename);
    strcpy(arrParams[3], "-vcodec");
    strcpy(arrParams[4], m_pTCParams->videoCodecName);
    strcpy(arrParams[5], "-acodec");
    strcpy(arrParams[6], m_pTCParams->audioCodecName);
    strcpy(arrParams[7], "-y");
    sprintf(strOutName, "SampleVideo_1280x720_20mb.%s", m_pTCParams->muxerName);
    strcpy(arrParams[8], strOutName);
    // 准备参数
    main_ffmpeg431(9, arrParams);
    for (int k = 0; k < MAX_CMDLINE_ARGC_COUNT; k++) {
        delete[] arrParams[k];  // 切记要释放申请的内存
        arrParams[k] = NULL;
    }
}

// 定时器事件处理函数
// 获取实时转码进度
// 当前进度为 1.00 时，killTimer
void Widget::timerEvent(QTimerEvent *event)
{
    int nPrg = (int)(get_tc_progress() * 100);
    qDebug() << "progress:" << nPrg;
    ui->progressBar_tcprg->setValue(nPrg);
    if (nPrg >= 100) {
        killTimer(m_TimerID1);
    }
}