QML调用android摄像头,Qt QML Camera to C++ QImage on Android

最新推荐文章于 2025-04-14 09:52:32 发布

刘俊虎

最新推荐文章于 2025-04-14 09:52:32 发布

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文章标签： QML调用android摄像头

本文介绍了两种在Qt QML中调用Android摄像头的方法。第一种是使用QAbstractVideoFilter和QVideoFilterRunnable，但不适用于实时应用，因为需要从OpenGL纹理读取数据。第二种方法是利用QVideoProbe，直接在C++侧处理QVideoFrame，适合实时需求。通过QML与C++交互，可以获取并处理摄像头的原始图像数据，但无法将处理后的帧返回到QML展示。

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1) Yes, it is possible. I´ve come around two ways to do it.

Using QAbstractVideoFilter alongside with QVideoFilterRunnable classes (QT 5.5 only! ) which are plain great. They were developed specifically for this case scenario, and are pretty easy to use.

There are a few good examples on the web using it:

The downside to this approach is, like was said here , is that on Android devices the QVideoFrame pointer doesnt has raw pixel data, instead, it has an OpenGL Texture which need to be read back (the second example I posted has a workaround solving this), thus making this approach not realy good for real time purposes IMHO.

What I ended up using to solve this problem was the QVideoProbe class.

First you have to name the instance of your QML camera:

Camera {

id: camera

objectName: "qrCameraQML"

}

Then you get this instance from C++ side, som