《计算机英语》 Unit 3 Software Engineering 软件工程

xcamera_widget.h

class XCameraWidget :public QWidget
{
    Q_OBJECT

public:
    XCameraWidget(QWidget* p = nullptr);

    //渲染视频
    void Draw();//123

    //清理资源,再一个窗口被覆盖后 清理之前窗口生成的资源1
    ~XCameraWidget();//123
private:
    XDecodeTask* decode_ = nullptr;//123
    XDemuxTask* demux_ = nullptr;
    XVideoView* view_ = nullptr;

};

xcamera_widget.cpp

XCameraWidget::XCameraWidget(QWidget* p) :QWidget(p)
{
    //接收拖拽
    this->setAcceptDrops(true);
}

//拖拽松开
void XCameraWidget::dropEvent(QDropEvent* e)
{
    //拿到url
    qDebug() << e->source()->objectName();
    auto wid = (QListWidget*)e->source();
    qDebug() << wid->currentRow();
    auto cam = XCameraConfig::Instance()->GetCam(wid->currentRow());
    Open(cam.sub_url);


}



bool XCameraWidget::Open(const char* url)
{
    if (demux_)
        demux_->Stop();
    if (decode_)
        decode_->Stop();
    //打开解封装线程
    demux_ = new XDemuxTask();
    if (!demux_->Open(url))
    {
        return false;
    }
    //打开视频解码器线程
    decode_ = new XDecodeTask();
    auto para = demux_->CopyVideoPara();
    if (!decode_->Open(para->para))
    {
        return false;
    }
    //设定解码线程接收解封装数据
    demux_->set_next(decode_);

    //初始化渲染参数
    view_ = XVideoView::Create();
    view_->set_win_id((void*)winId());
    view_->Init(para->para);

    //启动解封装和解码线程
    demux_->Start();
    decode_->Start();
    return true;
}

//渲染视频
void XCameraWidget::Draw()
{
    if (!demux_ || !decode_ || !view_)return;
    auto f = decode_->GetFrame();
    if (!f)return;
    view_->DrawFrame(f);
    XFreeFrame(&f);
}



//清理资源
XCameraWidget::~XCameraWidget()
{
    if (demux_)
    {
        demux_->Stop();
        delete demux_;
        demux_ == nullptr;
    }
    if (decode_)
    {
        decode_->Stop();
        delete decode_;
        decode_ == nullptr;
    }
    if (view_)
    {
        view_->Close();
        delete view_;
        view_ = nullptr;
    }
}

xviewer.h        

   


public:
 //定时器渲染视频 回调函数
   
 void timerEvent(QTimerEvent* ev) override;//123

xviewer.cpp

//定时器渲染视频 回调函数
void XViewer::timerEvent(QTimerEvent* ev)//123
{
    //总窗口数量
    int wid_size = sizeof(cam_wids) / sizeof(QWidget*);
    for (int i = 0; i < wid_size; i++)
    {
        if (cam_wids[i])
        {
            //渲染多窗口视频
            cam_wids[i]->Draw();
        }
    }

}

在xviewer的构造函数中最后一行添加  startTimer(1);即可启动计时器调用timerEvent函数来进行渲染