qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/avfoundation/camera/avfcameracontrol.mm

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#include "avfcameradebug.h"
#include "avfcameracontrol.h"
#include "avfcamerasession.h"
#include "avfcameraservice.h"

QT_USE_NAMESPACE

AVFCameraControl::AVFCameraControl(AVFCameraService *service, QObject *parent)
   : QCameraControl(parent)
   , m_session(service->session())
   , m_state(QCamera::UnloadedState)
   , m_lastStatus(QCamera::UnloadedStatus)
   , m_captureMode(QCamera::CaptureStillImage)
{
    Q_UNUSED(service);
    connect(m_session, SIGNAL(stateChanged(QCamera::State)), SLOT(updateStatus()));
    connect(this, &AVFCameraControl::captureModeChanged, m_session, &AVFCameraSession::onCaptureModeChanged);
}

AVFCameraControl::~AVFCameraControl()
{
}

QCamera::State AVFCameraControl::state() const
{
    return m_state;
}

void AVFCameraControl::setState(QCamera::State state)
{
    if (m_state == state)
        return;
    m_state = state;
    m_session->setState(state);

    Q_EMIT stateChanged(m_state);
    updateStatus();
}

QCamera::Status AVFCameraControl::status() const
{
    static QCamera::Status statusTable[3][3] = {
        { QCamera::UnloadedStatus, QCamera::UnloadingStatus, QCamera::StoppingStatus }, //Unloaded state
        { QCamera::LoadingStatus,  QCamera::LoadedStatus,    QCamera::StoppingStatus }, //Loaded state
        { QCamera::LoadingStatus,  QCamera::StartingStatus,  QCamera::ActiveStatus } //ActiveState
    };

    return statusTable[m_state][m_session->state()];
}

void AVFCameraControl::updateStatus()
{
    QCamera::Status newStatus = status();

    if (m_lastStatus != newStatus) {
        qDebugCamera() << "Camera status changed: " << m_lastStatus << " -> " << newStatus;
        m_lastStatus = newStatus;
        Q_EMIT statusChanged(m_lastStatus);
    }
}

QCamera::CaptureModes AVFCameraControl::captureMode() const
{
    return m_captureMode;
}

void AVFCameraControl::setCaptureMode(QCamera::CaptureModes mode)
{
    if (m_captureMode == mode)
        return;

    if (!isCaptureModeSupported(mode)) {
        Q_EMIT error(QCamera::NotSupportedFeatureError, tr("Requested capture mode is not supported"));
        return;
    }

    m_captureMode = mode;
    Q_EMIT captureModeChanged(mode);
}

bool AVFCameraControl::isCaptureModeSupported(QCamera::CaptureModes mode) const
{
    //all the capture modes are supported, including QCamera::CaptureStillImage | QCamera::CaptureVideo
    return (mode & (QCamera::CaptureStillImage | QCamera::CaptureVideo)) == mode;
}

bool AVFCameraControl::canChangeProperty(QCameraControl::PropertyChangeType changeType, QCamera::Status status) const
{
    Q_UNUSED(changeType);
    Q_UNUSED(status);

    return true;
}

#include "moc_avfcameracontrol.cpp"