Qt下调用vlc库实现RTSP拉流播放和截图过程详解

LIBS += -L$$PWD/libVLC/lib/ -lVLCQtCore -lVLCQtWidgets
INCLUDEPATH += $$PWD/libVLC/include
DEPENDPATH += $$PWD/libVLC/include

#include "widget.h"
#include <QApplication>
#include "VLCQtCore/Common.h"
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    VlcCommon::setPluginPath(a.applicationDirPath() + "/plugins");
    Widget w;
    w.show();
    return a.exec();
}

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include "VLCQtCore/Common.h"
#include "VLCQtCore/Instance.h"
#include "VLCQtCore/Media.h"
#include "VLCQtCore/MediaPlayer.h"
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE
class Widget : public QWidget
{
    Q_OBJECT
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
private slots:
    void on_btn_startPlay_clicked();
    void on_btn_pause_clicked(bool checked);
    void on_btn_stop_clicked();
    void on_btn_snap_clicked();
private:
    Ui::Widget *ui;
    VlcInstance * inst;
    VlcMediaPlayer *vlcPlayer;
    VlcMedia *vlcMedia;
};
#endif // WIDGET_H

#pragma execution_character_set("utf-8")
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->btn_snap->setEnabled(false);
    inst = new VlcInstance(VlcCommon::args(), this);
    vlcPlayer = new VlcMediaPlayer(inst);
    vlcPlayer->setVideoWidget(ui->widget_video);
}
Widget::~Widget()
{
    delete ui;
}
void Widget::on_btn_startPlay_clicked()
{
    QString rtspUrl = ui->edt_rtspUrl->text();
    if(!rtspUrl.isEmpty())
    {
        vlcMedia = new VlcMedia(rtspUrl, inst);
        vlcPlayer->open(vlcMedia);
        ui->btn_snap->setEnabled(true);
    }
}
void Widget::on_btn_pause_clicked(bool checked)
{
    if(checked)
    {
        ui->btn_pause->setText("继续");
    }
    else
    {
        ui->btn_pause->setText("暂停");
    }
    vlcPlayer->togglePause();
}
void Widget::on_btn_stop_clicked()
{
    vlcPlayer->stop();
    ui->btn_snap->setEnabled(false);
}
void Widget::on_btn_snap_clicked()
{
    emit vlcPlayer->snapshotTaken("E:/123.jpg");
}