QVideoFrame::map() is false in android

RyuShai

Me again
I try to capture frame from camera using QCamera and QAbstractVideoSurface. Trying convert QVideoFrame to QImage in present() function but map() return fail when run on android 9, API 28

This working find on linux

PixelFormat had test: Format_RGB32,Format_RGB565,Format_Jpeg

any i idead how to convert QVideoFrame to QImage on android ? Or other way to grap camera frame

SGaist

Hi,

How are you mapping your video frame ?

Note that on Android, IIRC; you get an OpenGL texture.

RyuShai

here how i convert QVideoFrame to QImage to display

bool AndroidFrame::present(const QVideoFrame &currentFrame)
{
    qDebug()<<currentFrame.pixelFormat()<<currentFrame.isValid()<<endl;
    if (currentFrame.isValid()) {
        cloneFrame = currentFrame;
        qDebug()<<cloneFrame.map(QAbstractVideoBuffer::ReadWrite);
        const QImage img(cloneFrame.bits(),
                     cloneFrame.width(),
                     cloneFrame.height(),
                     QVideoFrame::imageFormatFromPixelFormat(QVideoFrame::Format_Jpeg));

         emit frameChanged(img);
        return true;
    }
    return false;
}

seem incorrect for android, do you have any suggestion ?

SGaist

Why are you mapping the frame in ReadWrite mode ? Read should be enough for your usage.