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50
51#include "videowidgetsurface.h"
52
53#include <QtWidgets>
54#include <qabstractvideosurface.h>
55#include <qvideosurfaceformat.h>
56
57VideoWidgetSurface::VideoWidgetSurface(QWidget *widget, QObject *parent)
58 : QAbstractVideoSurface(parent)
59 , widget(widget)
60 , imageFormat(QImage::Format_Invalid)
61{
62}
63
64//! [0]
65QList<QVideoFrame::PixelFormat> VideoWidgetSurface::supportedPixelFormats(
66 QAbstractVideoBuffer::HandleType handleType) const
67{
68 if (handleType == QAbstractVideoBuffer::NoHandle) {
69 return QList<QVideoFrame::PixelFormat>()
70 << QVideoFrame::Format_RGB32
71 << QVideoFrame::Format_ARGB32
72 << QVideoFrame::Format_ARGB32_Premultiplied
73 << QVideoFrame::Format_RGB565
74 << QVideoFrame::Format_RGB555;
75 } else {
76 return QList<QVideoFrame::PixelFormat>();
77 }
78}
79//! [0]
80
81//! [1]
82bool VideoWidgetSurface::isFormatSupported(const QVideoSurfaceFormat &format) const
83{
84 const QImage::Format imageFormat = QVideoFrame::imageFormatFromPixelFormat(format: format.pixelFormat());
85 const QSize size = format.frameSize();
86
87 return imageFormat != QImage::Format_Invalid
88 && !size.isEmpty()
89 && format.handleType() == QAbstractVideoBuffer::NoHandle;
90}
91//! [1]
92
93//! [2]
94bool VideoWidgetSurface::start(const QVideoSurfaceFormat &format)
95{
96 const QImage::Format imageFormat = QVideoFrame::imageFormatFromPixelFormat(format: format.pixelFormat());
97 const QSize size = format.frameSize();
98
99 if (imageFormat != QImage::Format_Invalid && !size.isEmpty()) {
100 this->imageFormat = imageFormat;
101 imageSize = size;
102 sourceRect = format.viewport();
103
104 QAbstractVideoSurface::start(format);
105
106 widget->updateGeometry();
107 updateVideoRect();
108
109 return true;
110 } else {
111 return false;
112 }
113}
114//! [2]
115
116//! [3]
117void VideoWidgetSurface::stop()
118{
119 currentFrame = QVideoFrame();
120 targetRect = QRect();
121
122 QAbstractVideoSurface::stop();
123
124 widget->update();
125}
126//! [3]
127
128//! [4]
129bool VideoWidgetSurface::present(const QVideoFrame &frame)
130{
131 if (surfaceFormat().pixelFormat() != frame.pixelFormat()
132 || surfaceFormat().frameSize() != frame.size()) {
133 setError(IncorrectFormatError);
134 stop();
135
136 return false;
137 } else {
138 currentFrame = frame;
139
140 widget->repaint(targetRect);
141
142 return true;
143 }
144}
145//! [4]
146
147//! [5]
148void VideoWidgetSurface::updateVideoRect()
149{
150 QSize size = surfaceFormat().sizeHint();
151 size.scale(s: widget->size().boundedTo(otherSize: size), mode: Qt::KeepAspectRatio);
152
153 targetRect = QRect(QPoint(0, 0), size);
154 targetRect.moveCenter(p: widget->rect().center());
155}
156//! [5]
157
158//! [6]
159void VideoWidgetSurface::paint(QPainter *painter)
160{
161 if (currentFrame.map(mode: QAbstractVideoBuffer::ReadOnly)) {
162 const QTransform oldTransform = painter->transform();
163
164 if (surfaceFormat().scanLineDirection() == QVideoSurfaceFormat::BottomToTop) {
165 painter->scale(sx: 1, sy: -1);
166 painter->translate(dx: 0, dy: -widget->height());
167 }
168
169 QImage image(
170 currentFrame.bits(),
171 currentFrame.width(),
172 currentFrame.height(),
173 currentFrame.bytesPerLine(),
174 imageFormat);
175
176 painter->drawImage(targetRect, image, sourceRect);
177
178 painter->setTransform(transform: oldTransform);
179
180 currentFrame.unmap();
181 }
182}
183//! [6]
184

source code of qtmultimedia/examples/multimediawidgets/customvideosurface/customvideowidget/videowidgetsurface.cpp