1、mediaplayer.h

#ifndef MYMEDIAPLAYER_H
#define MYMEDIAPLAYER_H
#include <QMediaPlayer>
#include <QAbstractVideoSurface>

class MyMediaPlayer: public QMediaPlayer
{
Q_OBJECT
public:
    Q_PROPERTY(QAbstractVideoSurface* videoSurface READ getVideoSurface WRITE setVideoSurface )
    Q_INVOKABLE void play();
public:
    MyMediaPlayer(QObject * parent = 0, Flags flags = 0);

public slots:

    void setVideoSurface(QAbstractVideoSurface* surface);
    QAbstractVideoSurface* getVideoSurface();
    void OnMetaDataAvailableChanged(bool available);

private:
    QAbstractVideoSurface* m_surface;
};
#endif // MYMEDIAPLAYER_H

2、mediaplayer.cpp

#include "mymediaplayer.h"

void MyMediaPlayer::play()
{
    qDebug()<<"play...";
    QMediaPlayer::setMedia(QUrl::fromLocalFile("D:/KuGou/MV/mv.mp4"));
    QMediaPlayer::play();
    QString strTitle = QMediaPlayer::metaData("Title").toString();
    QString strSize= QMediaPlayer::metaData("Size").toString();
    qDebug()<<"title: " + strTitle + "size: "+ strSize;
}

MyMediaPlayer::MyMediaPlayer(QObject* parent, Flags flags): QMediaPlayer(parent, flags)
{
    connect(this, SIGNAL(metaDataAvailableChanged(bool)), this, SLOT(OnMetaDataAvailableChanged(bool)));
}

void MyMediaPlayer::setVideoSurface(QAbstractVideoSurface* surface)
{
    qDebug() << "Changing surface";
    m_surface = surface;
    setVideoOutput(m_surface);
}

QAbstractVideoSurface* MyMediaPlayer::getVideoSurface()
{
    return m_surface;
}

void MyMediaPlayer::OnMetaDataAvailableChanged(bool available)
{
    // 数据显示
    qDebug() << "OnMetaDataAvailableChanged";
    if(available){
        foreach(QString str,availableMetaData()){
            qDebug()<<str<<"   :"<<metaData(str).toString().toUtf8().data();
        }
        //playlist->setCurrentIndex(++count);
    }
}

3、qml 文件

import QtQuick 2.6
import QtQuick.Window 2.2
import QtMultimedia 5.6
import QtQuick.Controls 1.4
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Button {
        id: play;
        width: 120;
        height: 60;
        text: qsTr("播放")
        onClicked: {
            console.log("clicked button");
            mymediaplayer.play();
        }
    }

    VideoOutput {
        id: videooutput
        anchors.top: play.bottom;
        width: 320
        height: 240
        source: mymediaplayer
    }
}

4、main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "mymediaplayer.h"
#include <QQmlContext>
using namespace std;
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    MyMediaPlayer* player = new MyMediaPlayer();
    QQmlApplicationEngine engine;
    engine.rootContext()->setContextProperty("mymediaplayer", player);
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}