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    41 

    42 #include "videoplayer.h"

    43 #include "videoitem.h"

    44 

    45 #include <QtMultimedia>

    46 

    47 #ifndef QT_NO_OPENGL

    48 # include <QtOpenGL/QGLWidget>

    49 #endif

    50 

    51 VideoPlayer::VideoPlayer(QWidget *parent, Qt::WindowFlags flags)

    52     : QWidget(parent, flags)

    53     , videoItem(0)

    54     , playButton(0)

    55     , positionSlider(0)

    56 {

    57     connect(&movie, SIGNAL(stateChanged(QMovie::MovieState)),

    58             this, SLOT(movieStateChanged(QMovie::MovieState)));

    59     connect(&movie, SIGNAL(frameChanged(int)),

    60             this, SLOT(frameChanged(int)));

    61 

    62     videoItem = new VideoItem;

    63 

    64     QGraphicsScene *scene = new QGraphicsScene(this);

    65     QGraphicsView *graphicsView = new QGraphicsView(scene);

    66 

    67 #ifndef QT_NO_OPENGL

    68     graphicsView->setViewport(new QGLWidget);

    69 #endif

    70 

    71     scene->addItem(videoItem);

    72 

    73     QSlider *rotateSlider = new QSlider(Qt::Horizontal);

    74     rotateSlider->setRange(-180,  180);

    75     rotateSlider->setValue(0);

    76 

    77     connect(rotateSlider, SIGNAL(valueChanged(int)),

    78             this, SLOT(rotateVideo(int)));

    79 

    80     QAbstractButton *openButton = new QPushButton(tr("Open..."));

    81     connect(openButton, SIGNAL(clicked()), this, SLOT(openFile()));

    82 

    83     playButton = new QPushButton;

    84     playButton->setEnabled(false);

    85     playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    86 

    87     connect(playButton, SIGNAL(clicked()),

    88             this, SLOT(play()));

    89 

    90     positionSlider = new QSlider(Qt::Horizontal);

    91     positionSlider->setRange(0, 0);

    92 

    93     connect(positionSlider, SIGNAL(sliderMoved(int)),

    94             this, SLOT(setPosition(int)));

    95 

    96     connect(&movie, SIGNAL(frameChanged(int)),

    97             positionSlider, SLOT(setValue(int)));

    98 

    99     QBoxLayout *controlLayout = new QHBoxLayout;

   100     controlLayout->setMargin(0);

   101     controlLayout->addWidget(openButton);

   102     controlLayout->addWidget(playButton);

   103     controlLayout->addWidget(positionSlider);

   104 

   105     QBoxLayout *layout = new QVBoxLayout;

   106     layout->addWidget(graphicsView);

   107     layout->addWidget(rotateSlider);

   108     layout->addLayout(controlLayout);

   109 

   110     setLayout(layout);

   111 }

   112 

   113 VideoPlayer::~VideoPlayer()

   114 {

   115 }

   116 

   117 void VideoPlayer::openFile()

   118 {

   119     QString fileName = QFileDialog::getOpenFileName(this, tr("Open Movie"));

   120 

   121     if (!fileName.isEmpty()) {

   122         if (videoItem->isStarted())

   123             videoItem->stop();

   124 

   125         movie.setFileName(fileName);

   126 

   127         playButton->setEnabled(true);

   128         positionSlider->setMaximum(movie.frameCount());

   129 

   130         movie.jumpToFrame(0);

   131     }

   132 }

   133 

   134 void VideoPlayer::play()

   135 {

   136     switch(movie.state()) {

   137     case QMovie::NotRunning:

   138         movie.start();

   139         break;

   140     case QMovie::Paused:

   141         movie.setPaused(false);

   142         break;

   143     case QMovie::Running:

   144         movie.setPaused(true);

   145         break;

   146     }

   147 }

   148 

   149 void VideoPlayer::movieStateChanged(QMovie::MovieState state)

   150 {

   151     switch(state) {

   152     case QMovie::NotRunning:

   153     case QMovie::Paused:

   154         playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

   155         break;

   156     case QMovie::Running:

   157         playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));

   158         break;

   159     }

   160 }

   161 

   162 void VideoPlayer::frameChanged(int frame)

   163 {

   164     if (!presentImage(movie.currentImage())) {

   165         movie.stop();

   166         playButton->setEnabled(false);

   167         positionSlider->setMaximum(0);

   168     } else {

   169         positionSlider->setValue(frame);

   170     }

   171 }

   172 

   173 void VideoPlayer::setPosition(int frame)

   174 {

   175     movie.jumpToFrame(frame);

   176 }

   177 

   178 void VideoPlayer::rotateVideo(int angle)

   179 {

   180     //rotate around the center of video element

   181     qreal x = videoItem->boundingRect().width() / 2.0;

   182     qreal y = videoItem->boundingRect().height() / 2.0;

   183     videoItem->setTransform(QTransform().translate(x, y).rotate(angle).translate(-x, -y));

   184 }

   185 

   186 bool VideoPlayer::presentImage(const QImage &image)

   187 {

   188     QVideoFrame frame(image);

   189 

   190     if (!frame.isValid())

   191         return false;

   192 

   193     QVideoSurfaceFormat currentFormat = videoItem->surfaceFormat();

   194 

   195     if (frame.pixelFormat() != currentFormat.pixelFormat()

   196             || frame.size() != currentFormat.frameSize()) {

   197         QVideoSurfaceFormat format(frame.size(), frame.pixelFormat());

   198 

   199         if (!videoItem->start(format))

   200             return false;

   201     }

   202 

   203     if (!videoItem->present(frame)) {

   204         videoItem->stop();

   205 

   206         return false;

   207     } else {

   208         return true;

   209     }

   210 }