qt - 将图像原始数据缓冲区设置为 QMediaPlayer

Question

我想获取小部件应用程序的屏幕截图，然后使用 setMedia() 将其原始数据缓冲区设置为 QMeidaPlayer。到目前为止我所做的是接收图像，保存它，然后从中读取。但是，我想问你如何直接读取原始数据而不将其保存到媒体播放器中:

QPixmap originalPixmap = QPixmap::grabWidget(this);

QImage *image = new QImage(originalPixmap.toImage());

QByteArray ba;

QBuffer buffer(&ba);

buffer.setBuffer(&ba);

buffer.open(QIODevice::WriteOnly);

image->save(&buffer); // writes image into ba in PNG format

image->save(image Path);

mediaPlayer.setMedia(QUrl::fromLocalFile(image path)); //I want this to read from raw data

mediaPlayer.play();

我希望这占用最少的 CPU 使用率。但是，保存和读取文件会消耗大量 CPU，47%。

干杯，

更新:我也用这个代码片段测试了这个程序。但它不会在视频小部件上绘制缓冲区内容。

QBuffer *buffer = new QBuffer(image_ba);
QMediaContent media;
mediaPlayer.setMedia(media, buffer);
mediaPlayer.play();

有什么想法可以解决这个问题以将图像原始数据输入到视频小部件吗？

Answer 1

您可以这样做:

QPixmap originalPixmap = QPixmap::grabWidget(this);
QBuffer *buffer = new QBuffer(); // make sure that your buffer has the same life span as your media player, or otherwise the media player would try to read data from non-existing buffer. (the setMedia() and play() methods are non-blocking)
buffer.open(QIODevice::ReadWrite);
originalPixmap.save(buffer, "PNG"); // can be any other format, not just PNG
    
mediaPlayer.setMedia(QUrl(), buffer);
mediaPlayer.play();