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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         surface->stop();

   104 

   105         movie.setFileName(fileName);

   106 

   107         playButton->setEnabled(true);

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

   109 

   110         movie.jumpToFrame(0);

   111     }

   112 }

   113 

   114 void VideoPlayer::play()

   115 {

   116     switch(movie.state()) {

   117     case QMovie::NotRunning:

   118         movie.start();

   119         break;

   120     case QMovie::Paused:

   121         movie.setPaused(false);

   122         break;

   123     case QMovie::Running:

   124         movie.setPaused(true);

   125         break;

   126     }

   127 }

   128 

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

   130 {

   131     switch(state) {

   132     case QMovie::NotRunning:

   133     case QMovie::Paused:

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

   135         break;

   136     case QMovie::Running:

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

   138         break;

   139     }

   140 }

   141 

   142 void VideoPlayer::frameChanged(int frame)

   143 {

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

   145         movie.stop();

   146         playButton->setEnabled(false);

   147         positionSlider->setMaximum(0);

   148     } else {

   149         positionSlider->setValue(frame);

   150     }

   151 }

   152 

   153 void VideoPlayer::setPosition(int frame)

   154 {

   155     movie.jumpToFrame(frame);

   156 }

   157 

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

   159 {

   160     QVideoFrame frame(image);

   161 

   162     if (!frame.isValid())

   163         return false;

   164 

   165     QVideoSurfaceFormat currentFormat = surface->surfaceFormat();

   166 

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

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

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

   170 

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

   172             return false;

   173     }

   174 

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

   176         surface->stop();

   177 

   178         return false;

   179     } else {

   180         return true;

   181     }

   182 }