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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     QStringList supportedFormats;

   121     foreach (QString fmt, QMovie::supportedFormats())

   122         supportedFormats << fmt;

   123     foreach (QString fmt, QImageReader::supportedImageFormats())

   124         supportedFormats << fmt;

   125 

   126     QString filter = "Images (";

   127     foreach ( QString fmt, supportedFormats) {

   128         filter.append(QString("*.%1 ").arg(fmt));

   129     }

   130     filter.append(")");

   131 

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

   133             QDir::homePath(), filter);

   134 

   135     if (!fileName.isEmpty()) {

   136         videoItem->stop();

   137 

   138         movie.setFileName(fileName);

   139 

   140         playButton->setEnabled(true);

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

   142 

   143         movie.jumpToFrame(0);

   144     }

   145 }

   146 

   147 void VideoPlayer::play()

   148 {

   149     switch(movie.state()) {

   150     case QMovie::NotRunning:

   151         movie.start();

   152         break;

   153     case QMovie::Paused:

   154         movie.setPaused(false);

   155         break;

   156     case QMovie::Running:

   157         movie.setPaused(true);

   158         break;

   159     }

   160 }

   161 

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

   163 {

   164     switch(state) {

   165     case QMovie::NotRunning:

   166     case QMovie::Paused:

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

   168         break;

   169     case QMovie::Running:

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

   171         break;

   172     }

   173 }

   174 

   175 void VideoPlayer::frameChanged(int frame)

   176 {

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

   178         movie.stop();

   179         playButton->setEnabled(false);

   180         positionSlider->setMaximum(0);

   181     } else {

   182         positionSlider->setValue(frame);

   183     }

   184 }

   185 

   186 void VideoPlayer::setPosition(int frame)

   187 {

   188     movie.jumpToFrame(frame);

   189 }

   190 

   191 void VideoPlayer::rotateVideo(int angle)

   192 {

   193     //rotate around the center of video element

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

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

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

   197 }

   198 

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

   200 {

   201     QVideoFrame frame(image);

   202 

   203     if (!frame.isValid())

   204         return false;

   205 

   206     QVideoSurfaceFormat currentFormat = videoItem->surfaceFormat();

   207 

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

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

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

   211 

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

   213             return false;

   214     }

   215 

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

   217         videoItem->stop();

   218 

   219         return false;

   220     } else {

   221         return true;

   222     }

   223 }