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    41 

    42 #include "videoplayer.h"

    43 

    44 #include "videowidget.h"

    45 

    46 #include <QtMultimedia>

    47 

    48 VideoPlayer::VideoPlayer(QWidget *parent)

    49     : QWidget(parent)

    50     , surface(0)

    51     , playButton(0)

    52     , positionSlider(0)

    53 {

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

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

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

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

    58 

    59     VideoWidget *videoWidget = new VideoWidget;

    60     surface = videoWidget->videoSurface();

    61 

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

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

    64 

    65     playButton = new QPushButton;

    66     playButton->setEnabled(false);

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

    68 

    69     connect(playButton, SIGNAL(clicked()),

    70             this, SLOT(play()));

    71 

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

    73     positionSlider->setRange(0, 0);

    74 

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

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

    77 

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

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

    80 

    81     QBoxLayout *controlLayout = new QHBoxLayout;

    82     controlLayout->setMargin(0);

    83     controlLayout->addWidget(openButton);

    84     controlLayout->addWidget(playButton);

    85     controlLayout->addWidget(positionSlider);

    86 

    87     QBoxLayout *layout = new QVBoxLayout;

    88     layout->addWidget(videoWidget);

    89     layout->addLayout(controlLayout);

    90 

    91     setLayout(layout);

    92 }

    93 

    94 VideoPlayer::~VideoPlayer()

    95 {

    96 }

    97 

    98 void VideoPlayer::openFile()

    99 {

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

   101 

   102     if (!fileName.isEmpty()) {

   103         if (surface->isStarted())

   104             surface->stop();

   105 

   106         movie.setFileName(fileName);

   107 

   108         playButton->setEnabled(true);

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

   110 

   111         movie.jumpToFrame(0);

   112     }

   113 }

   114 

   115 void VideoPlayer::play()

   116 {

   117     switch(movie.state()) {

   118     case QMovie::NotRunning:

   119         movie.start();

   120         break;

   121     case QMovie::Paused:

   122         movie.setPaused(false);

   123         break;

   124     case QMovie::Running:

   125         movie.setPaused(true);

   126         break;

   127     }

   128 }

   129 

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

   131 {

   132     switch(state) {

   133     case QMovie::NotRunning:

   134     case QMovie::Paused:

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

   136         break;

   137     case QMovie::Running:

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

   139         break;

   140     }

   141 }

   142 

   143 void VideoPlayer::frameChanged(int frame)

   144 {

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

   146         movie.stop();

   147         playButton->setEnabled(false);

   148         positionSlider->setMaximum(0);

   149     } else {

   150         positionSlider->setValue(frame);

   151     }

   152 }

   153 

   154 void VideoPlayer::setPosition(int frame)

   155 {

   156     movie.jumpToFrame(frame);

   157 }

   158 

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

   160 {

   161     QVideoFrame frame(image);

   162 

   163     if (!frame.isValid())

   164         return false;

   165 

   166     QVideoSurfaceFormat currentFormat = surface->surfaceFormat();

   167 

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

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

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

   171 

   172         if (!surface->start(format))

   173             return false;

   174     }

   175 

   176     if (!surface->present(frame)) {

   177         surface->stop();

   178 

   179         return false;

   180     } else {

   181         return true;

   182     }

   183 }