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    41 

    42 #include "videoitem.h"

    43 

    44 #include <QtMultimedia>

    45 

    46 VideoItem::VideoItem(QGraphicsItem *parent)

    47     : QGraphicsItem(parent)

    48     , imageFormat(QImage::Format_Invalid)

    49     , framePainted(false)

    50 {

    51 }

    52 

    53 VideoItem::~VideoItem()

    54 {

    55 }

    56 

    57 QRectF VideoItem::boundingRect() const

    58 {

    59     return QRectF(QPointF(0,0), surfaceFormat().sizeHint());

    60 }

    61 

    62 void VideoItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

    63 {

    64     Q_UNUSED(option);

    65     Q_UNUSED(widget);

    66 

    67     if (currentFrame.map(QAbstractVideoBuffer::ReadOnly)) {

    68         const QTransform oldTransform = painter->transform();

    69 

    70         if (surfaceFormat().scanLineDirection() == QVideoSurfaceFormat::BottomToTop) {

    71            painter->scale(1, -1);

    72            painter->translate(0, -boundingRect().height());

    73         }

    74 

    75         painter->drawImage(boundingRect(), QImage(

    76                 currentFrame.bits(),

    77                 imageSize.width(),

    78                 imageSize.height(),

    79                 imageFormat));

    80 

    81         painter->setTransform(oldTransform);

    82 

    83         framePainted = true;

    84 

    85         currentFrame.unmap();

    86     }

    87 }

    88 

    89 QList<QVideoFrame::PixelFormat> VideoItem::supportedPixelFormats(

    90         QAbstractVideoBuffer::HandleType handleType) const

    91 {

    92     if (handleType == QAbstractVideoBuffer::NoHandle) {

    93         return QList<QVideoFrame::PixelFormat>()

    94                 << QVideoFrame::Format_RGB32

    95                 << QVideoFrame::Format_ARGB32

    96                 << QVideoFrame::Format_ARGB32_Premultiplied

    97                 << QVideoFrame::Format_RGB565

    98                 << QVideoFrame::Format_RGB555;

    99     } else {

   100         return QList<QVideoFrame::PixelFormat>();

   101     }

   102 }

   103 

   104 bool VideoItem::start(const QVideoSurfaceFormat &format)

   105 {

   106     if (isFormatSupported(format)) {

   107         imageFormat = QVideoFrame::equivalentImageFormat(format.pixelFormat());

   108         imageSize = format.frameSize();

   109         framePainted = true;

   110 

   111         QAbstractVideoSurface::start(format);

   112 

   113         prepareGeometryChange();

   114 

   115         return true;

   116     } else {

   117         return false;

   118     }

   119 }

   120 

   121 void VideoItem::stop()

   122 {

   123     currentFrame = QVideoFrame();

   124     framePainted = false;

   125 

   126     QAbstractVideoSurface::stop();

   127 }

   128 

   129 bool VideoItem::present(const QVideoFrame &frame)

   130 {

   131     if (!framePainted) {

   132         if (!isStarted())

   133             setError(StoppedError);

   134 

   135         return false;

   136     } else {

   137         currentFrame = frame;

   138         framePainted = false;

   139 

   140         update();

   141 

   142         return true;

   143     }

   144 }