qt-everywhere-src-5.15.1/qtmultimedia/examples/multimediawidgets/customvideosurface/customvideoitem/videoplayer.cpp

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#include "videoplayer.h"
#include "videoitem.h"

#include <QtWidgets>
#include <QVideoSurfaceFormat>

#if !defined(QT_NO_OPENGL)
# include <QOpenGLWidget>
#endif

VideoPlayer::VideoPlayer(QWidget *parent)
    : QWidget(parent)
    , mediaPlayer(0, QMediaPlayer::VideoSurface)
    , videoItem(0)
    , playButton(0)
    , positionSlider(0)
{
    videoItem = new VideoItem;

    QGraphicsScene *scene = new QGraphicsScene(this);
    QGraphicsView *graphicsView = new QGraphicsView(scene);

#if !defined(QT_NO_OPENGL)
    graphicsView->setViewport(new QOpenGLWidget);
#endif

    scene->addItem(videoItem);

    QSlider *rotateSlider = new QSlider(Qt::Horizontal);
    rotateSlider->setRange(-180,  180);
    rotateSlider->setValue(0);

    connect(rotateSlider, &QSlider::valueChanged,
            this, &VideoPlayer::rotateVideo);

    QAbstractButton *openButton = new QPushButton(tr("Open..."));
    connect(openButton, &QAbstractButton::clicked,
            this, &VideoPlayer::openFile);

    playButton = new QPushButton;
    playButton->setEnabled(false);
    playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    connect(playButton, &QAbstractButton::clicked,
            this, &VideoPlayer::play);

    positionSlider = new QSlider(Qt::Horizontal);
    positionSlider->setRange(0, 0);

    connect(positionSlider, &QSlider::sliderMoved,
            this, &VideoPlayer::setPosition);

    QBoxLayout *controlLayout = new QHBoxLayout;
    controlLayout->setContentsMargins(0, 0, 0, 0);
    controlLayout->addWidget(openButton);
    controlLayout->addWidget(playButton);
    controlLayout->addWidget(positionSlider);

    QBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(graphicsView);
    layout->addWidget(rotateSlider);
    layout->addLayout(controlLayout);

    setLayout(layout);

    mediaPlayer.setVideoOutput(videoItem);
    connect(&mediaPlayer, &QMediaPlayer::stateChanged,
            this, &VideoPlayer::mediaStateChanged);
    connect(&mediaPlayer, &QMediaPlayer::positionChanged, this, &VideoPlayer::positionChanged);
    connect(&mediaPlayer, &QMediaPlayer::durationChanged, this, &VideoPlayer::durationChanged);
}

VideoPlayer::~VideoPlayer()
{
}


void VideoPlayer::openFile()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open Movie"),QDir::homePath());

    if (!fileName.isEmpty()) {
        mediaPlayer.setMedia(QUrl::fromLocalFile(fileName));

        playButton->setEnabled(true);
    }
}

void VideoPlayer::play()
{
    switch(mediaPlayer.state()) {
    case QMediaPlayer::PlayingState:
        mediaPlayer.pause();
        break;
    default:
        mediaPlayer.play();
        break;
    }
}

void VideoPlayer::mediaStateChanged(QMediaPlayer::State state)
{
    switch(state) {
    case QMediaPlayer::PlayingState:
        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
        break;
    default:
        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
        break;
    }
}

void VideoPlayer::positionChanged(qint64 position)
{
    positionSlider->setValue(position);
}

void VideoPlayer::durationChanged(qint64 duration)
{
    positionSlider->setRange(0, duration);
}

void VideoPlayer::setPosition(int position)
{
    mediaPlayer.setPosition(position);
}


void VideoPlayer::rotateVideo(int angle)
{
    //rotate around the center of video element
    qreal x = videoItem->boundingRect().width() / 2.0;
    qreal y = videoItem->boundingRect().height() / 2.0;
    videoItem->setTransform(QTransform().translate(x, y).rotate(angle).translate(-x, -y));
}