Android QQuickWidget QCamera UI Freeze

metaDom

I'm trying to implement a QR Code Scanner for Android in a Qt Widget project.

The following code shows how I load the QML code. "camView" is the QQuickWidget. It should display a live stream of the camera video.

Instead it shows nothing but freezes the whole application, until I do minimize it via the Android home button. Once I resume the application from background, it shows the video feed perfectly.

@void MainWindow::openScanner()
{
returnToCamview();

QGridLayout *layout = new QGridLayout;
layout->addWidget(camView);
camView->setSource(QUrl("qrc:/cameraView.qml"));
camView->setResizeMode(QQuickWidget::SizeRootObjectToView);
ui->camBox->setLayout(layout);
camView->show();

}@

The second problem is that I need to convert a QVideoFrame in a decent format for QXZing. Currently I do the following when a new frame is probed:

@QImage::Format imgFormat = QVideoFrame::imageFormatFromPixelFormat(m_currentFrame.pixelFormat());

    QImage lastImage(m_currentFrame.bits(),
        m_currentFrame.width(),
        m_currentFrame.height(),
        m_currentFrame.bytesPerLine(),
        imgFormat);

QString ret = decoder.decodeImage(lastImage);@

"decoder" is the QXZing object. It always returns -1 as the "lastImage" is not valid.

Thanks in advance!

metaDom

bug confirmed for the first part of the post:

https://bugreports.qt-project.org/browse/QTBUG-41467