Qt获取摄像头画面的每一帧数据

继承自QAbstractVideoSurface，实现它的一些虚函数，可以在实现的虚函数 present 中获取到摄像头画面的一帧数据，拿到数据之后就可以转换处理了，这里拿到数据之后，绘制在主窗口上了。
主要代码：
首先在 .pro 中加入 multimedia 模块:

QT += core gui multimedia multimediawidgets

MainWindow.cpp

#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QtWidgets>
#include <QVideosurfaceFormat>MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);camera_ = new QCamera;surface_ = new MyVideoSurface(this);camera_->setViewfinder(surface_);camera_->start();//这里启动
}MainWindow::~MainWindow()
{delete ui;
}QSize MainWindow::sizeHint() const
{return surface_->surfaceFormat().sizeHint();
}void MainWindow::paintEvent(QPaintEvent *event)
{QPainter painter(this);if (surface_->isActive()) {const QRect videoRect = surface_->videoRect();if (!videoRect.contains(event->rect())) {QRegion region = event->region();region = region.subtracted(videoRect);QBrush brush = palette().background();for (const QRect &rect : region){painter.fillRect(rect, brush);}}surface_->paint(&painter);//在主窗口绘制} else {painter.fillRect(event->rect(), palette().background());}
}void MainWindow::resizeEvent(QResizeEvent *event)
{QMainWindow::resizeEvent(event);surface_->updateVideoRect();
}

MyVideoSurface.h

#ifndef MYVIDEOSURFACE_H
#define MYVIDEOSURFACE_H#include <QAbstractVideoSurface>
#include <QImage>
#include <QRect>
#include <QVideoFrame>class MyVideoSurface : public QAbstractVideoSurface
{Q_OBJECTpublic:MyVideoSurface(QWidget *widget, QObject *parent = 0);QList<QVideoFrame::PixelFormat> supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType = QAbstractVideoBuffer::NoHandle) const override;bool isFormatSupported(const QVideoSurfaceFormat &format) const override;bool start(const QVideoSurfaceFormat &format) override;bool present(const QVideoFrame &frame) override;void stop() override;QRect videoRect() const;void updateVideoRect();void paint(QPainter *painter);private:QWidget * widget_;QImage::Format imageFormat_;QRect targetRect_;QSize imageSize_;QVideoFrame currentFrame_;
};#endif

MyVideoSurface.cpp

#include "MyVideoSurface.h"#include <QtWidgets>
#include <qabstractvideosurface.h>
#include <qvideosurfaceformat.h>
#include <QVideoSurfaceFormat>MyVideoSurface::MyVideoSurface(QWidget *widget, QObject *parent): QAbstractVideoSurface(parent), widget_(widget), imageFormat_(QImage::Format_Invalid)
{}QList<QVideoFrame::PixelFormat> MyVideoSurface::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>();}
}bool MyVideoSurface::isFormatSupported(const QVideoSurfaceFormat & format) const
{return QVideoFrame::imageFormatFromPixelFormat(format.pixelFormat()) != QImage::Format_Invalid && !format.frameSize().isEmpty() && format.handleType() == QAbstractVideoBuffer::NoHandle;
}bool MyVideoSurface::start(const QVideoSurfaceFormat &format)
{const QImage::Format imageFormat_ = QVideoFrame::imageFormatFromPixelFormat(format.pixelFormat());const QSize size = format.frameSize();if (imageFormat_ != QImage::Format_Invalid && !size.isEmpty()) {this->imageFormat_ = imageFormat_;widget_->resize(size);QAbstractVideoSurface::start(format);widget_->updateGeometry();updateVideoRect();return true;}return false;
}void MyVideoSurface::stop()
{currentFrame_ = QVideoFrame();targetRect_ = QRect();QAbstractVideoSurface::stop();widget_->update();
}bool MyVideoSurface::present(const QVideoFrame &frame) //每一帧摄像头的数据，都会经过这里
{if (surfaceFormat().pixelFormat() != frame.pixelFormat() || surfaceFormat().frameSize() != frame.size()) {setError(IncorrectFormatError);stop();return false;}currentFrame_ = frame;widget_->repaint(targetRect_);return true;
}QRect MyVideoSurface::videoRect() const
{return targetRect_;
}void MyVideoSurface::updateVideoRect()
{QSize size = surfaceFormat().sizeHint();size.scale(widget_->size().boundedTo(size), Qt::KeepAspectRatio);targetRect_ = QRect(QPoint(0, 0), size);targetRect_.moveCenter(widget_->rect().center());
}void MyVideoSurface::paint(QPainter *painter)//这里绘制每一帧数据
{if (currentFrame_.map(QAbstractVideoBuffer::ReadOnly)) {//img就是转换的数据了QImage img = QImage(currentFrame_.bits(),currentFrame_.width(),currentFrame_.height(),currentFrame_.bytesPerLine(),imageFormat_).mirrored(true,false).scaled(widget_->size());painter->drawImage(targetRect_, img, QRect(QPoint(0,0),img.size()));currentFrame_.unmap();}
}

效果：

代码：https://github.com/yangyang0312/QtTestCode/tree/master/testCamera (Qt5.11)

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