在Qt 5.12中,你可以使用QOpenGLWidget来显示视频。首先,你需要创建一个继承自QOpenGLWidget的自定义类,然后在其中使用QMediaPlayer来播放视频,并将视频渲染到QOpenGLWidget上。
下面是一个简单的示例代码:
#include <QtWidgets>
#include <QtMultimedia>
class VideoPlayerWidget : public QOpenGLWidget
{
public:
VideoPlayerWidget(QWidget *parent = nullptr)
: QOpenGLWidget(parent)
{
mediaPlayer = new QMediaPlayer(this);
mediaPlayer->setVideoOutput(this);
connect(mediaPlayer, &QMediaPlayer::stateChanged, this, &VideoPlayerWidget::mediaStateChanged);
}
void setMedia(const QString &filePath)
{
mediaPlayer->setMedia(QUrl::fromLocalFile(filePath));
}
protected:
void initializeGL() override
{
initializeOpenGLFunctions();
}
void paintGL() override
{
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
if (mediaPlayer->state() == QMediaPlayer::PlayingState) {
if (!texturesInitialized) {
textures[0] = textureFromImage(videoFrame.image());
texturesInitialized = true;
}
glBindTexture(GL_TEXTURE_2D, textures[0]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
videoFrame.width(), videoFrame.height(),
0, GL_BGR_EXT, GL_UNSIGNED_BYTE,
videoFrame.bits());
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f(1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex2f(1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, 1.0f);
glEnd();
}
}
void resizeGL(int w, int h) override
{
glViewport(0, 0, w, h);
}
private slots:
void mediaStateChanged(QMediaPlayer::State state)
{
if (state == QMediaPlayer::PlayingState) {
update();
}
}
private:
QMediaPlayer *mediaPlayer;
QVideoFrame videoFrame;
bool texturesInitialized = false;
GLuint textures[1];
GLuint textureFromImage(const QImage &image)
{
GLuint textureId = 0;
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D, textureId);
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGB,
image.width(),
image.height(),
0,
GL_BGR_EXT,
GL_UNSIGNED_BYTE,
image.bits());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
return textureId;
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
VideoPlayerWidget playerWidget;
playerWidget.setMedia("path/to/video.mp4");
QMainWindow mainWindow;
mainWindow.setCentralWidget(&playerWidget);
mainWindow.show();
return app.exec();
}
在上述示例中,我们创建了一个继承自QOpenGLWidget的VideoPlayerWidget类。在其中,我们使用QMediaPlayer来播放视频,并将视频帧渲染到OpenGL上下文中。
请注意,此示例假设你已经正确设置了Qt和OpenGL环境,并且已经包含了相关的头文件和库。确保正确配置.pro文件以包含必要的模块(例如QT += multimedia
)。
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