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  1. Qt
  2. QTBUG-94101

In Ubuntu 18.04 system, the function supportedviewfindersettings() is called through qcamera class, and the return value is null

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3: Somewhat important
    • Resolution: Invalid
    • Affects Version/s: 5.15.0 RC2
    • Fix Version/s: None
    • Component/s: Multimedia
    • Labels:
      None
    • Environment:
      Ubuntu18.04,Virtual Box
    • Platform/s:
      Linux/X11

      Description

      In the demo camera provided by QT ,i add the following code int the last of setCamera function:

      QList<QCameraViewfinderSettings> settings = m_camera->supportedViewfinderSettings(); qDebug() << "Settings size is " << settings.size();

      in Windows system,i can get some value of list,but in Linux ,i get nothing, the return list size is 0.

      Through debugging source code,i found a very strange problem,the following code is  in the camerabinsession.cpp file  of Multimedia module, function name is  supportedViewfinderSettings,i add the debug infomation:

      QList<QCameraViewfinderSettings> CameraBinSession::supportedViewfinderSettings() const
      {
          qDebug() << "m_status = " << m_status;
          qDebug() << "m_status >= QCamera::LoadedStatus result is " << (m_status >= QCamera::LoadedStatus);
          if (m_status >= QCamera::LoadedStatus && m_supportedViewfinderSettings.isEmpty()) {
              m_supportedViewfinderSettings =
                  capsToViewfinderSettings(supportedCaps(QCamera::CaptureViewfinder));
          }
          return m_supportedViewfinderSettings;
      }
      

      The final result is as follows:

      m_status =  QCamera::LoadingStatus
      m_status >= QCamera::LoadedStatus result is  false

      why m_status value is QCamera::LoadingStatus,but the judgment that (m_status >= QCamera::LoadedStatus) return false ?This result in the return value is always none if the m_supportedViewfinderSettings list is empty

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            Assignee:
            valentyn.doroshchuk Valentyn Doroshchuk
            Reporter:
            hailang hailang
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              Updated:
              Resolved:

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