Qt应用程序开发五：QMediaPlayer播放视频，提取视频帧，多窗口播放同一视频

效果图：

方法一：QMediaPlayer+QVideoWidget （如果其他格式视频播放不出来，安装一个视频解码器可以解决)

#include "QMutPlayer.h"
#include "ui_QMutPlayer.h"
#include<QFileDialog>
#include<QDebug>QMutPlayer::QMutPlayer(QWidget *parent) :QWidget(parent),ui(new Ui::QMutPlayer)
{ui->setupUi(this);mVideoPlayer = new QMediaPlayer(this);mSurfacePlayer = new QMediaPlayer(this);mVideoWidget  = new QVideoWidget(ui->lab_videowidget);mVideoPlayer->setVideoOutput(mVideoWidget);
}QMutPlayer::~QMutPlayer()
{delete ui;
}void QMutPlayer::on_btn_select_video_clicked()
{QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),"", tr("video (*.mp4 *.wav *.avi)"));if(fileName.isEmpty())return;mVideoPlayer->setMedia(QUrl(fileName));mVideoPlayer->play();}void QMutPlayer::showEvent(QShowEvent *event)
{Q_UNUSED(event)mVideoWidget->resize(ui->lab_videowidget->size());
}

方法二：QMediaPlayer+ QAbstractVideoSurface 提取视频帧

然后将视频帧转化为QImage,用QML 和QLabel 加载，或者QWidget 的paintEvent 绘画出来

//提取视频帧#ifndef VIDEOSURFACE_H
#define VIDEOSURFACE_H#include <QObject>
#include<QAbstractVideoSurface>class VideoSurface : public QAbstractVideoSurface
{Q_OBJECT
public:explicit VideoSurface(QObject *parent = 0);
signals:void showImage(QImage img);protected:bool present(const QVideoFrame &frame);QList<QVideoFrame::PixelFormat> supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType = QAbstractVideoBuffer::NoHandle) const;
};#endif // VIDEOSURFACE_H#include "VideoSurface.h"
#include<QPixmap>
VideoSurface::VideoSurface(QObject *parent) : QAbstractVideoSurface(parent)
{}QList<QVideoFrame::PixelFormat> VideoSurface::supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType) const
{Q_UNUSED(handleType);QList<QVideoFrame::PixelFormat> listPixelFormats;listPixelFormats << QVideoFrame::Format_RGB32<< QVideoFrame::Format_BGR32;return listPixelFormats;}bool VideoSurface::present(const QVideoFrame &frame){if (frame.isValid()){QVideoFrame cloneFrame(frame);cloneFrame.map(QAbstractVideoBuffer::ReadOnly);QImage recvImage(cloneFrame.bits(), cloneFrame.width(), cloneFrame.height(), QVideoFrame::imageFormatFromPixelFormat(cloneFrame.pixelFormat()));cloneFrame.unmap();emit showImage(recvImage);return true;}return false;}//调用mSurfacePlayer = new QMediaPlayer(this);mVideoSurface = new VideoSurface(this);mSurfacePlayer->setVideoOutput(mVideoSurface);connect(mVideoSurface,SIGNAL(showImage(QImage)),SLOT(onShowImage(QImage)));

/QML 刷新图片 需要用到QQuickImageProvider #ifndef IMAGEPROVIDER_H
#define IMAGEPROVIDER_H#include <QQuickImageProvider>
class ImageProvider : public QQuickImageProvider
{public:explicit ImageProvider();
public:void addImage(QImage &image);QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize);QImage  requestImage(const QString &id, QSize *size, const QSize &requestedSize);private:QImage mImage;};#endif // IMAGEPROVIDER_H#include "ImageProvider.h"ImageProvider::ImageProvider(): QQuickImageProvider(QQuickImageProvider::Image)
{}void ImageProvider::addImage(QImage &image)
{mImage = image;
}QPixmap ImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
{return QPixmap::fromImage(mImage);
}QImage ImageProvider::requestImage(const QString &id, QSize *size, const QSize &requestedSize)
{return mImage;
}#ifndef SHOWIMAGE_H
#define SHOWIMAGE_H#include <QObject>
#include"ImageProvider.h"class ShowImage : public QObject
{Q_OBJECT
public:static ShowImage *instance();~ShowImage();ImageProvider *m_pImgProvider;void setImage(QImage image);signals:void callQmlRefeshImg();
private:ShowImage(QObject *parent = 0);static ShowImage *mShowImage;
};#endif // SHOWIMAGE_H#include "ShowImage.h"ShowImage* ShowImage::mShowImage = NULL;ShowImage:: ShowImage(QObject *parent) : QObject(parent)
{m_pImgProvider = new ImageProvider();
}ShowImage *ShowImage::instance()
{if(mShowImage == NULL)mShowImage = new ShowImage;return mShowImage;
}ShowImage::~ShowImage()
{delete m_pImgProvider;
}void ShowImage::setImage(QImage image)
{m_pImgProvider->addImage(image);emit callQmlRefeshImg();
}#ifndef QMLLOADWIDGET_H
#define QMLLOADWIDGET_H#include <QWidget>
#include<QQuickWidget>class QmlLoadWidget : public QQuickWidget
{Q_OBJECT
public:explicit QmlLoadWidget(QWidget *parent = 0);
signals:void errMessage(QString msg);
public slots:void addImage(QImage image);void getErr(QQuickWindow::SceneGraphError error, const QString &message);};#endif // QMLLOADWIDGET_H#include "QmlLoadWidget.h"
#include<QQmlEngine>
#include<QQmlContext>
#include"ShowImage.h"QmlLoadWidget::QmlLoadWidget(QWidget *parent) : QQuickWidget(parent)
{this->resize(parent->size());setResizeMode(QQuickWidget::SizeRootObjectToView);rootContext()->setContextProperty("CodeImage",ShowImage::instance());engine()->addImageProvider("CodeImg",ShowImage::instance()->m_pImgProvider);setSource(QUrl("qrc:/QmlRender/LoadVideImage.qml"));}void QmlLoadWidget::addImage(QImage image)
{ShowImage::instance()->setImage(image);
}void QmlLoadWidget::getErr(QQuickWindow::SceneGraphError error, const QString &message)
{emit errMessage(message);
}

完整代码下载地址：https://download.csdn.net/download/xzpblog/10960022

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