videoplayer.cpp Example File
multimediawidgets/videographicsitem/videoplayer.cpp
#include "videoplayer.h"
#include <QtWidgets>
#include <QVideoSurfaceFormat>
#include <QGraphicsVideoItem>
VideoPlayer::VideoPlayer(QWidget *parent)
: QWidget(parent)
, mediaPlayer(0, QMediaPlayer::VideoSurface)
, videoItem(0)
, playButton(0)
, positionSlider(0)
{
videoItem = new QGraphicsVideoItem;
videoItem->setSize(QSizeF(640, 480));
QGraphicsScene *scene = new QGraphicsScene(this);
QGraphicsView *graphicsView = new QGraphicsView(scene);
scene->addItem(videoItem);
QSlider *rotateSlider = new QSlider(Qt::Horizontal);
rotateSlider->setRange(-180, 180);
rotateSlider->setValue(0);
connect(rotateSlider, SIGNAL(valueChanged(int)),
this, SLOT(rotateVideo(int)));
QAbstractButton *openButton = new QPushButton(tr("Open..."));
connect(openButton, SIGNAL(clicked()), this, SLOT(openFile()));
playButton = new QPushButton;
playButton->setEnabled(false);
playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
connect(playButton, SIGNAL(clicked()),
this, SLOT(play()));
positionSlider = new QSlider(Qt::Horizontal);
positionSlider->setRange(0, 0);
connect(positionSlider, SIGNAL(sliderMoved(int)),
this, SLOT(setPosition(int)));
QBoxLayout *controlLayout = new QHBoxLayout;
controlLayout->setMargin(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, SIGNAL(stateChanged(QMediaPlayer::State)),
this, SLOT(mediaStateChanged(QMediaPlayer::State)));
connect(&mediaPlayer, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));
connect(&mediaPlayer, SIGNAL(durationChanged(qint64)), this, SLOT(durationChanged(qint64)));
}
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)
{
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));
}