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    16 ** GNU Lesser General Public License Usage

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    40 ****************************************************************************/

    41 

    42 #include "videoplayer.h"

    43 #include "videoitem.h"

    44 

    45 #include <QtGui>

    46 #include <qvideosurfaceformat.h>

    47 

    48 #ifndef QT_NO_OPENGL

    49 # include <QtOpenGL/QGLWidget>

    50 #endif

    51 

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

    53     : QWidget(parent, flags)

    54     , videoItem(0)

    55     , playButton(0)

    56     , positionSlider(0)

    57 {

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

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

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

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

    62 

    63     videoItem = new VideoItem;

    64 

    65     QGraphicsScene *scene = new QGraphicsScene(this);

    66     QGraphicsView *graphicsView = new QGraphicsView(scene);

    67 

    68 #ifndef QT_NO_OPENGL

    69     graphicsView->setViewport(new QGLWidget);

    70 #endif

    71 

    72     scene->addItem(videoItem);

    73 

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

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

    76     rotateSlider->setValue(0);

    77 

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

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

    80 

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

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

    83 

    84     playButton = new QPushButton;

    85     playButton->setEnabled(false);

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

    87 

    88     connect(playButton, SIGNAL(clicked()),

    89             this, SLOT(play()));

    90 

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

    92     positionSlider->setRange(0, 0);

    93 

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

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

    96 

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

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

    99 

   100     QBoxLayout *controlLayout = new QHBoxLayout;

   101     controlLayout->setMargin(0);

   102     controlLayout->addWidget(openButton);

   103     controlLayout->addWidget(playButton);

   104     controlLayout->addWidget(positionSlider);

   105 

   106     QBoxLayout *layout = new QVBoxLayout;

   107     layout->addWidget(graphicsView);

   108     layout->addWidget(rotateSlider);

   109     layout->addLayout(controlLayout);

   110 

   111     setLayout(layout);

   112 }

   113 

   114 VideoPlayer::~VideoPlayer()

   115 {

   116 }

   117 

   118 void VideoPlayer::openFile()

   119 {

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

   121 

   122     if (!fileName.isEmpty()) {

   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 }