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Diffstat (limited to 'examples/video/videowidget/videowidgetsurface.cpp')
| -rw-r--r-- | examples/video/videowidget/videowidgetsurface.cpp | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/examples/video/videowidget/videowidgetsurface.cpp b/examples/video/videowidget/videowidgetsurface.cpp new file mode 100644 index 0000000..6089b6f --- /dev/null +++ b/examples/video/videowidget/videowidgetsurface.cpp @@ -0,0 +1,175 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at http://qt.nokia.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "videowidgetsurface.h" + +#include <QtMultimedia> + +VideoWidgetSurface::VideoWidgetSurface(QWidget *widget, QObject *parent) + : QAbstractVideoSurface(parent) + , widget(widget) + , imageFormat(QImage::Format_Invalid) +{ +} + +//! [0] +QList<QVideoFrame::PixelFormat> VideoWidgetSurface::supportedPixelFormats( + QAbstractVideoBuffer::HandleType handleType) const +{ + if (handleType == QAbstractVideoBuffer::NoHandle) { + return QList<QVideoFrame::PixelFormat>() + << QVideoFrame::Format_RGB32 + << QVideoFrame::Format_ARGB32 + << QVideoFrame::Format_ARGB32_Premultiplied + << QVideoFrame::Format_RGB565 + << QVideoFrame::Format_RGB555; + } else { + return QList<QVideoFrame::PixelFormat>(); + } +} +//! [0] + +//! [1] +bool VideoWidgetSurface::isFormatSupported( + const QVideoSurfaceFormat &format, QVideoSurfaceFormat *similar) const +{ + Q_UNUSED(similar); + + const QImage::Format imageFormat = QVideoFrame::equivalentImageFormat(format.pixelFormat()); + const QSize size = format.frameSize(); + + return imageFormat != QImage::Format_Invalid + && !size.isEmpty() + && format.handleType() == QAbstractVideoBuffer::NoHandle; +} +//! [1] + +//! [2] +bool VideoWidgetSurface::start(const QVideoSurfaceFormat &format) +{ + const QImage::Format imageFormat = QVideoFrame::equivalentImageFormat(format.pixelFormat()); + const QSize size = format.frameSize(); + + if (imageFormat != QImage::Format_Invalid && !size.isEmpty()) { + this->imageFormat = imageFormat; + imageSize = size; + sourceRect = format.viewport(); + + QAbstractVideoSurface::start(format); + + widget->updateGeometry(); + updateVideoRect(); + + return true; + } else { + return false; + } +} +//! [2] + +//! [3] +void VideoWidgetSurface::stop() +{ + currentFrame = QVideoFrame(); + targetRect = QRect(); + + QAbstractVideoSurface::stop(); + + widget->update(); +} +//! [3] + +//! [4] +bool VideoWidgetSurface::present(const QVideoFrame &frame) +{ + if (surfaceFormat().pixelFormat() != frame.pixelFormat() + || surfaceFormat().frameSize() != frame.size()) { + setError(IncorrectFormatError); + stop(); + + return false; + } else { + currentFrame = frame; + + widget->repaint(targetRect); + + return true; + } +} +//! [4] + +//! [5] +void VideoWidgetSurface::updateVideoRect() +{ + QSize size = surfaceFormat().sizeHint(); + size.scale(widget->size().boundedTo(size), Qt::KeepAspectRatio); + + targetRect = QRect(QPoint(0, 0), size); + targetRect.moveCenter(widget->rect().center()); +} +//! [5] + +//! [6] +void VideoWidgetSurface::paint(QPainter *painter) +{ + if (currentFrame.map(QAbstractVideoBuffer::ReadOnly)) { + const QTransform oldTransform = painter->transform(); + + if (surfaceFormat().scanLineDirection() == QVideoSurfaceFormat::BottomToTop) { + painter->scale(1, -1); + painter->translate(0, -widget->height()); + } + + QImage image( + currentFrame.bits(), + currentFrame.width(), + currentFrame.height(), + currentFrame.bytesPerLine(), + imageFormat); + + painter->drawImage(targetRect, image, sourceRect); + + painter->setTransform(oldTransform); + + currentFrame.unmap(); + } +} +//! [6] |