如何在Qt中实现基于GStreamer的视频小部件？

INCLUDEPATH += /usr/include/gstreamer-1.0
INCLUDEPATH += /usr/include/glib-2.0
INCLUDEPATH += /usr/lib64/glib-2.0/include
LIBS += -lgstreamer-1.0
LIBS += -lgobject-2.0
LIBS += -lglib-2.0

#include <QWidget>
#include <gst/gst.h>

class VideoWidget : public QWidget {
    Q_OBJECT
public:
    VideoWidget(QWidget *parent = nullptr);
    ~VideoWidget();

public slots:
    void play();
    void pause();
    void stop();

private:
    GstElement *pipeline;
};

#include "videowidget.h"
#include <QDebug>

VideoWidget::VideoWidget(QWidget *parent) : QWidget(parent) {
    // Initialize GStreamer
    gst_init(nullptr, nullptr);

    // Create GStreamer pipeline
    pipeline = gst_pipeline_new("video-player");

    // Create video sink element
    GstElement *sink = gst_element_factory_make("qtvideosink", "video-sink");

    // Create video source element
    GstElement *src = gst_element_factory_make("filesrc", "file-source");
    g_object_set(G_OBJECT(src), "location", "/path/to/video/file.mp4", nullptr);

    // Create decode element
    GstElement *decode = gst_element_factory_make("decodebin", "decoder");

    // Add elements to pipeline
    gst_bin_add_many(GST_BIN(pipeline), src, decode, sink, nullptr);

    // Link elements
    gst_element_link_many(src, decode, sink, nullptr);

    // Set pipeline to playing state
    gst_element_set_state(pipeline, GST_STATE_PLAYING);
}

VideoWidget::~VideoWidget() {
    // Set pipeline to null state
    gst_element_set_state(pipeline, GST_STATE_NULL);

    // Free pipeline
    gst_object_unref(GST_OBJECT(pipeline));
}

void VideoWidget::play() {
    // Set pipeline to playing state
    gst_element_set_state(pipeline, GST_STATE_PLAYING);
}

void VideoWidget::pause() {
    // Set pipeline to paused state
    gst_element_set_state(pipeline, GST_STATE_PAUSED);
}

void VideoWidget::stop() {
    // Set pipeline to null state
    gst_element_set_state(pipeline, GST_STATE_NULL);
}