qcamera.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
 
#include "qcamera_p.h"
 
#include <qcameradevice.h>
#include <private/qplatformcamera_p.h>
#include <private/qplatformimagecapture_p.h>
#include <private/qplatformmediaintegration_p.h>
#include <private/qplatformmediacapture_p.h>
#include <qmediadevices.h>
#include <qmediacapturesession.h>
 
#include <QDebug>
 
QT_BEGIN_NAMESPACE
 
/*!
    \class QCamera
 
 
    \brief The QCamera class provides interface for system camera devices.
 
    \inmodule QtMultimedia
    \ingroup multimedia
    \ingroup multimedia_camera
 
    QCamera can be used within a QMediaCaptureSession for video recording and image taking.
 
    You can use QCameraDevice to list available cameras and choose which one to use.
 
    \snippet multimedia-snippets/camerasnippets.cpp Camera selection
 
    On hardware that supports it, \l QCamera lets you adjust the focus
    and zoom. The \l minimumZoomFactor and \l maximumZoomFactor
    properties provide the range of supported zoom factors. The
    \l zoomFactor property allows changing the zoom factor.
 
    \snippet multimedia-snippets/camerasnippets.cpp Camera zoom
 
    After capturing the raw data for a camera frame, the camera hardware and
    software performs various image processing tasks to produce the final
    image.  This includes compensating for ambient light color, reducing
    noise, as well as making some other adjustments to the image.
 
    You can control many of these processing steps through the Camera properties.
    For example, you can set the white balance (or color temperature) used
    for processing images:
 
    \snippet multimedia-snippets/camerasnippets.cpp Camera image whitebalance
 
    For more information on image processing of camera frames, see
    \l {camera_image_processing}{Camera Image Processing}.
 
    Most platforms require that the end-user grants permissions before a
    camera can be activated. It is therefore strongly recommended that
    application developers utilize the \l QCameraPermission class when
    working with cameras. The following is a short example that requests
    permissions from the end-user when the application starts, and then
    activates the camera if permissions are granted.
 
    \snippet multimedia-snippets/camerasnippets.cpp Camera permission
 
    See the \l{Camera Overview}{camera overview} for more information.
 
    \note On WebAssembly platform, due to its asynchronous nature,
    QMediaDevices::videoInputsChanged() signal is emitted when the list of
    video inputs is ready. User permissions are required. Works only on secure https contexts.
*/
 
/*!
    \qmltype Camera
    \nativetype QCamera
    \inqmlmodule QtMultimedia
    \brief An interface for camera settings related to focus and zoom.
    \ingroup multimedia_qml
    \ingroup camera_qml
 
    The Camera element can be used within a \l CaptureSession for video recording
    and image taking.
 
    You can use \l MediaDevices to list available cameras and choose which one to use.
 
    \snippet multimedia-snippets/camerasnippets.qml Camera selection
 
    On hardware that supports it, \l Camera lets you adjust the focus
    and zoom. The \l minimumZoomFactor and \l maximumZoomFactor
    properties provide the range of supported zoom factors. The
    \l zoomFactor property allows changing the zoom factor.
 
    \snippet multimedia-snippets/camerasnippets.qml Camera zoom
 
    After capturing the raw data for a camera frame, the camera hardware and
    software performs various image processing tasks to produce the final
    image.  This includes compensating for ambient light color, reducing
    noise, as well as making some other adjustments to the image.
 
    You can control many of these processing steps through the Camera properties.
    For example, you can set the white balance (or color temperature) used
    for processing images:
 
    \snippet multimedia-snippets/camerasnippets.qml Camera image whitebalance
 
    For more information on image processing of camera frames, see
    \l {camera_image_processing}{Camera Image Processing}.
 
    Most platforms require that the end-user grants permissions before a
    camera can be activated. It is therefore strongly recommended that
    application developers utilize the \l CameraPermission
    component when working with cameras. The following is a short
    example that requests permissions from the end-user when the
    application starts, and then activates the camera if permissions are
    granted.
 
    \snippet multimedia-snippets/camerasnippets.qml Camera permission
 
    See the \l{Camera Overview}{camera overview} for more information.
*/
 
void QCameraPrivate::init(const QCameraDevice &device)
{
    Q_Q(QCamera);
 
    auto maybeControl = QPlatformMediaIntegration::instance()->createCamera(q);
    if (!maybeControl) {
        qWarning() << "Failed to initialize QCamera" << maybeControl.error();
        return;
    }
    control = maybeControl.value();
    cameraDevice = !device.isNull() ? device : QMediaDevices::defaultVideoInput();
    if (cameraDevice.isNull())
        control->updateError(QCamera::CameraError, QStringLiteral("No camera detected"));
    control->setCamera(cameraDevice);
    q->connect(control, &QPlatformVideoSource::activeChanged, q, &QCamera::activeChanged);
    q->connect(control, &QPlatformCamera::errorChanged, q, &QCamera::errorChanged);
    q->connect(control, &QPlatformCamera::errorOccurred, q, &QCamera::errorOccurred);
}
 
/*!
    Construct a QCamera with a \a parent.
 
    Selects the default camera on the system if more than one camera is available.
*/
 
QCamera::QCamera(QObject *parent)
    : QCamera(QMediaDevices::defaultVideoInput(), parent)
{
}
 
/*!
    \since 5.3
 
    Construct a QCamera from a camera description \a cameraDevice and \a parent.
*/
 
QCamera::QCamera(const QCameraDevice &cameraDevice, QObject *parent)
    : QObject(*new QCameraPrivate, parent)
{
    Q_D(QCamera);
    d->init(cameraDevice);
}
 
/*!
    \since 5.3
 
    Construct a QCamera which uses a hardware camera located a the specified \a position.
 
    For example on a mobile phone it can be used to easily choose between front-facing and
    back-facing cameras.
 
    If no camera is available at the specified \a position or if \a position is
    QCameraDevice::UnspecifiedPosition, the default camera is used.
*/
 
QCamera::QCamera(QCameraDevice::Position position, QObject *parent)
    : QObject(*new QCameraPrivate, parent)
{
    Q_D(QCamera);
 
    QCameraDevice device;
    auto cameras = QMediaDevices::videoInputs();
    for (const auto &c : std::as_const(cameras)) {
        if (c.position() == position) {
            device = c;
            break;
        }
    }
    d->init(device);
}
 
/*!
    Destroys the camera object.
*/
 
QCamera::~QCamera()
{
    Q_D(QCamera);
    if (d->captureSession)
        d->captureSession->setCamera(nullptr);
}
 
/*!
    Returns true if the camera can be used.
*/
bool QCamera::isAvailable() const
{
    Q_D(const QCamera);
    return d->control && !d->cameraDevice.isNull();
}
 
/*! \qmlproperty bool QtMultimedia::Camera::active
 
    Describes whether the camera is currently active.
*/
 
/*! \property QCamera::active
 
    Describes whether the camera is currently active.
*/
 
/*!
    Returns true if the camera is currently active.
*/
bool QCamera::isActive() const
{
    Q_D(const QCamera);
    return d->control && d->control->isActive();
}
 
/*!
    Turns the camera on if \a active is \c{true}, or off if it's \c{false}.
*/
void QCamera::setActive(bool active)
{
    Q_D(const QCamera);
    if (d->control)
        d->control->setActive(active);
}
 
/*!
    \qmlproperty enumeration QtMultimedia::Camera::error
 
    Returns the error state of the camera.
 
    \qmlenumeratorsfrom QCamera::Error
*/
 
/*!
    \property QCamera::error
 
    Returns the error state of the camera.
 
    \sa QCamera::Error
*/
 
QCamera::Error QCamera::error() const
{
    Q_D(const QCamera);
 
    return d->control ? d->control->error() : QCamera::CameraError;
}
 
/*!
    \qmlproperty string QtMultimedia::Camera::errorString
 
    Returns a human readable string describing a camera's error state.
*/
 
/*!
    \property QCamera::errorString
 
    Returns a human readable string describing a camera's error state.
*/
QString QCamera::errorString() const
{
    Q_D(const QCamera);
 
    return d->control ? d->control->errorString()
                      : QStringLiteral("Camera is not supported on the platform");
}
 
/*! \enum QCamera::Feature
 
    Describes a set of features supported by the camera. The returned value can be a
    combination of:
 
    \value ColorTemperature
        The Camera supports setting a custom \l{colorTemperature}.
    \value ExposureCompensation
        The Camera supports setting a custom \l{exposureCompensation}.
    \value IsoSensitivity
        The Camera supports setting a custom \l{isoSensitivity}.
    \value ManualExposureTime
        The Camera supports setting a \l{QCamera::manualExposureTime}{manual exposure Time}.
    \value CustomFocusPoint
        The Camera supports setting a \l{QCamera::customFocusPoint}{custom focus point}.
    \value FocusDistance
        The Camera supports setting the \l{focusDistance} property.
*/
 
/*!
    \qmlproperty enumeration QtMultimedia::Camera::supportedFeatures
 
    Returns the features supported by this camera. The value is bitmask
    that may contain any of the following flags. It stores an OR
    combination of Feature values.
 
    \qmlenumeratorsfrom QCamera::Feature
*/
 
/*!
    \property QCamera::supportedFeatures
 
    Returns the features supported by this camera.
 
    \sa QCamera::Feature
*/
QCamera::Features QCamera::supportedFeatures() const
{
    Q_D(const QCamera);
    return d->control ? d->control->supportedFeatures() : QCamera::Features{};
}
 
/*! \qmlmethod void Camera::start()
 
    Starts the camera.
 
    Same as setting the active property to true.
 
    If the camera can't be started for some reason, the errorOccurred() signal is emitted.
*/
 
/*! \fn void QCamera::start()
 
    Starts the camera.
 
    Same as setActive(true).
 
    If the camera can't be started for some reason, the errorOccurred() signal is emitted.
*/
 
/*! \qmlmethod void Camera::stop()
 
    Stops the camera.
    Same as setting the active property to false.
*/
 
/*! \fn void QCamera::stop()
 
    Stops the camera.
    Same as setActive(false).
*/
 
/*!
    Returns the capture session this camera is connected to, or
    a nullptr if the camera is not connected to a capture session.
 
    use QMediaCaptureSession::setCamera() to connect the camera to
    a session.
*/
QMediaCaptureSession *QCamera::captureSession() const
{
    Q_D(const QCamera);
    return d->captureSession;
}
 
/*!
    \internal
*/
void QCamera::setCaptureSession(QMediaCaptureSession *session)
{
    Q_D(QCamera);
    d->captureSession = session;
}
 
/*!
    \internal
*/
QPlatformCamera *QCamera::platformCamera()
{
    Q_D(const QCamera);
    return d->control;
}
 
/*! \qmlproperty cameraDevice QtMultimedia::Camera::cameraDevice
 
    Gets or sets the currently active camera device.
 
    When switching camera devices, the \l Camera's capabilities are updated.
    Additionally, the \l Camera's control properties (such as \l focusMode,
    \l flashMode, \l focusDistance, \l zoomFactor) are updated as follows:
 
    \list
        \li If a property is supported on the new device, the property value is applied to the
            camera device.
        \li If a property is supported but its range of valid values was changed, the property
            is clamped to the new range and applied to the camera device.
        \li If the new camera device does not support a property, the property value is reset
            to default, and no changes are made to the camera device.
    \endlist
*/
 
/*!
    \property QCamera::cameraDevice
 
    Returns the QCameraDevice object associated with this camera.
 
    When switching camera devices, the \l QCamera's capabilities are updated.
    Additionally, the \l QCamera's control properties (such as \l focusMode,
    \l flashMode, \l focusDistance, \l zoomFactor) are updated as follows:
 
    \list
        \li If a property is supported on the new device, the property value is applied to the
            camera device.
        \li If a property is supported but its range of valid values was changed, the property
            is clamped to the new range and applied to the camera device.
        \li If the new camera device does not support a property, the property value is reset
            to default, and no changes are made to the camera device.
    \endlist
 */
QCameraDevice QCamera::cameraDevice() const
{
    Q_D(const QCamera);
    return d->cameraDevice;
}
 
/*!
    Connects the camera object to the physical camera device described by
    \a cameraDevice. Using a default constructed QCameraDevice object as
    \a cameraDevice will connect the camera to the system default camera device.
 
    When switching camera devices, the QCamera's capabilities are updated.
    Additionally, the QCamera's control properties (such as \l focusMode,
    \l flashMode, \l focusDistance, \l zoomFactor) are updated as follows:
 
    \list
        \li If a property is supported on the new device, the property value is applied to the
            camera device.
        \li If a property is supported but its range of valid values was changed, the property
            is clamped to the new range and applied to the camera device.
        \li If the new camera device does not support a property, the property value is reset
            to default, and no changes are made to the camera device.
    \endlist
*/
void QCamera::setCameraDevice(const QCameraDevice &cameraDevice)
{
    Q_D(QCamera);
 
    if (!QPlatformMediaIntegration::instance()->isCameraSwitchingDuringRecordingSupported()
        && d->captureSession && d->captureSession->recorder()
        && d->captureSession->recorder()->recorderState() == QMediaRecorder::RecordingState) {
        qWarning("This media backend does not support camera device switching during recording");
        return;
    }
 
    auto dev = cameraDevice;
    if (dev.isNull())
        dev = QMediaDevices::defaultVideoInput();
    if (d->cameraDevice == dev)
        return;
    d->cameraDevice = dev;
    if (d->control)
        d->control->setCamera(d->cameraDevice);
    emit cameraDeviceChanged();
    setCameraFormat({});
}
 
/*! \qmlproperty cameraFormat QtMultimedia::Camera::cameraFormat
 
    Gets or sets the currently active camera format.
 
    \note When using the FFMPEG backend on an Android target device if you request
    \b YUV420P format, you will receive either a fully planar 4:2:0 YUV420P or a
    semi-planar NV12/NV21. This depends on the codec implemented by the device
    OEM.
 
    \note On macOS, camera-devices are shared across multiple
    applications on the operating system. This means that another
    application may override the format set by this property.
    Application developers should account for receiving video frames
    that have a different resolution, pixel format and framerate than
    what is described by this property. This property does not change
    when the device's format is modified by another application. The
    format described by this property can be re-applied to the device
    by re-activating the \l Camera.
 
    \sa cameraDevice::videoFormats
*/
 
/*!
    \property QCamera::cameraFormat
 
    Returns the camera format currently used by the camera.
 
    \note When using the FFMPEG backend on an Android target device if you request
    \b YUV420P format, you will receive either a fully planar 4:2:0 YUV420P or a
    semi-planar NV12/NV21. This depends on the codec implemented by the device
    OEM.
 
    \note On macOS, camera-devices are shared across multiple
    applications on the operating system. This means that another
    application may override the format set by this property.
    Application developers should account for receiving video frames
    that have a different resolution, pixel format and framerate than
    what is described by this property. This property does not change
    when the device's format is modified by another application. The
    format described by this property can be re-applied to the device
    by re-activating the \l QCamera.
 
    \sa QCameraDevice::videoFormats
*/
QCameraFormat QCamera::cameraFormat() const
{
    Q_D(const QCamera);
    return d->cameraFormat;
}
 
/*!
    Tells the camera to use the format described by \a format. This can be used to define
    a specific resolution and frame rate to be used for recording and image capture.
 
    \note When using the FFMPEG backend on an Android target device if you request
    \b YUV420P format, you will receive either a fully planar 4:2:0 YUV420P or a
    semi-planar NV12/NV21. This depends on the codec implemented by the device
    OEM.
*/
void QCamera::setCameraFormat(const QCameraFormat &format)
{
    Q_D(QCamera);
    if (!d->control || !d->control->setCameraFormat(format))
        return;
 
    d->cameraFormat = format;
    emit cameraFormatChanged();
}
 
/*!
    \enum QCamera::Error
 
    This enum holds the last error code.
 
    \value  NoError      No errors have occurred.
    \value  CameraError  An error has occurred.
*/
 
/*!
    \qmlsignal void Camera::errorOccurred(Camera::Error error, string errorString)
 
    This signal is emitted when error state changes to \a error. A description
    of the error is  provided as \a errorString.
*/
 
/*!
    \fn void QCamera::errorOccurred(QCamera::Error error, const QString &errorString)
 
    This signal is emitted when error state changes to \a error. A description
    of the error is  provided as \a errorString.
*/
 
/*!
    \qmlproperty enumeration Camera::focusMode
 
    This property holds the value that controls focus mode for the camera device.
    In all autofocus modes, the camera device keeps focusing continuously.
 
    \note In automatic focusing modes and where supported, the \l focusPoint property provides
    information and control over the area of the image that is being focused.
 
    \value Camera.FocusModeAuto Continuous auto focus mode.
    \value Camera.FocusModeAutoNear Continuous auto focus, preferring objects near to
        the camera.
    \value Camera.FocusModeAutoFar Continuous auto focus, preferring objects far away
        from the camera.
    \value Camera.FocusModeHyperfocal Focus to hyperfocal distance, with the maximum
        depth of field achieved. All objects at distances from half of this
        distance out to infinity will be acceptably sharp.
    \value Camera.FocusModeInfinity Focus strictly to infinity.
    \value Camera.FocusModeManual The lens focus distance is set to a value specified by \l focusDistance.
 
    To check whether the camera device supports a particular focus mode, pass the corresponding
    \c focusMode value to the \l isFocusModeSupported() function as a parameter. The function
    returns \c false if the focus mode value is not supported. Assigning an unsupported mode to
    this property has no effect.
 
    If you set the focusMode property to \c Camera.FocusModeManual, the lens
    locks to the focus according to \l focusDistance.
 
    \sa isFocusModeSupported()
*/
 
/*!
    \property QCamera::focusMode
    \brief the current camera focus mode.
 
    This property holds the value that controls focus mode for the camera device.
    In all autofocus modes, the camera device keeps focusing continuously.
 
    To check whether the camera device supports a particular focus mode, pass the corresponding
    \l FocusMode value to the \l isFocusModeSupported function as a parameter. The function
    returns false if the focus mode value is not supported. Assigning an unsupported mode to
    this property has no effect.
 
    If you set the focusMode property to \l QCamera::FocusModeManual, the lens
    locks to the focus according to \l focusDistance.
 
    \sa isFocusModeSupported()
*/
QCamera::FocusMode QCamera::focusMode() const
{
    Q_D(const QCamera);
    return d->control ? d->control->focusMode() : QCamera::FocusModeAuto;
}
 
/*!
    \fn void QCamera::focusModeChanged()
 
    Signals when the focusMode changes.
*/
void QCamera::setFocusMode(QCamera::FocusMode mode)
{
    Q_D(QCamera);
    if (!d->control || d->control->focusMode() == mode)
        return;
    d->control->setFocusMode(mode);
}
 
/*!
    \qmlmethod bool Camera::isFocusModeSupported(FocusMode mode)
 
    Returns \c true if the focus \a mode is supported by the camera.
 
    If \l {focusMode}{Camera.FocusModeManual} is reported as supported,
    the feature \l {supportedFeatures}{Camera.FocusDistance} is implied
    to be supported as well.
*/
 
/*!
    Returns \c true if the focus \a mode is supported by the camera.
 
    If \l FocusModeManual is reported as supported, the feature
    \l Feature::FocusDistance is implied to be supported as well.
*/
bool QCamera::isFocusModeSupported(FocusMode mode) const
{
    Q_D(const QCamera);
    return d->control ? d->control->isFocusModeSupported(mode) : false;
}
 
/*!
    \qmlproperty point QtMultimedia::Camera::focusPoint
    Returns the point currently used by the auto focus system to focus onto.
*/
 
/*!
    \property QCamera::focusPoint
 
    Returns the point currently used by the auto focus system to focus onto.
 */
QPointF QCamera::focusPoint() const
{
    Q_D(const QCamera);
    return d->control ? d->control->focusPoint() : QPointF(-1., -1.);
 
}
 
/*!
    \qmlproperty point QtMultimedia::Camera::customFocusPoint
 
    This property holds the position of custom focus point, in relative frame
    coordinates. This means that QPointF(0,0) points to the top-left corner
    of the frame, and QPointF(0.5,0.5) points to the center of the frame.
 
    You can check whether custom focus points are supported by querying
    supportedFeatures() with the Feature.CustomFocusPoint flag.
*/
 
/*!
    \property QCamera::customFocusPoint
 
    This property represents the position of the custom focus point, in relative frame coordinates:
    QPointF(0,0) points to the left top frame point, QPointF(0.5,0.5) points to the frame center.
 
    You can check whether custom focus points are supported by querying
    supportedFeatures() with the Feature.CustomFocusPoint flag.
*/
QPointF QCamera::customFocusPoint() const
{
    Q_D(const QCamera);
    return d->control ? d->control->customFocusPoint() : QPointF{-1., -1.};
}
 
void QCamera::setCustomFocusPoint(const QPointF &point)
{
    Q_D(QCamera);
    if (d->control)
        d->control->setCustomFocusPoint(point);
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::focusDistance
 
    This property defines the lens focus distance when the camera device works in
    manual focus mode. Valid values range from 0 to 1, where 0 is the closest
    possible focus distance, and 1 is the farthest. The farthest point is
    typically at infinity, but this may not be the case for all devices.
 
    This property is applied to the device only when \l focusMode is set to
    \l {focusMode}{Camera.FocusModeManual}, and \l supportedFeatures includes the
    \c Camera.FocusDistance flag.
 
    If you assign a value to this property while \l focusMode is not
    set to \c Camera.FocusModeManual, the property stores the value but does
    not affect the device until \c Camera.FocusModeManual is active.
 
    Assigning a value outside the valid range [0, 1] has no effect on this property.
 
    If \l supportedFeatures does not include the \c Camera.FocusDistance flag,
    any attempt to set this property is ignored.
 
    This property will not be updated by the camera when it is in an automatic focus mode.
 
    The default value is 1.
*/
 
/*!
    \property QCamera::focusDistance
 
    This property defines the lens focus distance when the camera device works in
    manual focus mode. Valid values range from 0 to 1, where 0 is the closest
    possible focus distance, and 1 is the farthest. The farthest point is
    typically at infinity, but this may not be the case for all devices.
 
    This property is applied to the device only when \l focusMode is set to
    \l FocusModeManual, and \l supportedFeatures includes the
    \l Feature::FocusDistance flag.
 
    If you assign a value to this property while \l focusMode is not
    set to \c QCamera::FocusModeManual, the property stores the value but does
    not affect the device until \c QCamera::FocusModeManual is active.
 
    Assigning a value outside the valid range [0, 1] has no effect on this property.
 
    If \l supportedFeatures does not include the \l FocusDistance flag,
    any attempt to set this property is ignored.
 
    This property will not be updated by the camera when it is in an automatic focus mode.
 
    The default value is 1.
*/
void QCamera::setFocusDistance(float distance)
{
    if (!d_func()->control)
        return;
    d_func()->control->setFocusDistance(distance);
}
 
float QCamera::focusDistance() const
{
    if (d_func()->control)
        return d_func()->control->focusDistance();
    return 0.f;
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::maximumZoomFactor
 
    This property holds the maximum zoom factor supported.
 
    This will be \c 1.0 on cameras that do not support zooming.
*/
 
 
/*!
    \property QCamera::maximumZoomFactor
 
    Returns the maximum zoom factor.
 
    This will be \c 1.0 on cameras that do not support zooming.
*/
 
float QCamera::maximumZoomFactor() const
{
    Q_D(const QCamera);
    return d->control ? d->control->maxZoomFactor() : 1.f;
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::minimumZoomFactor
 
    This property holds the minimum zoom factor supported.
 
    This will be \c 1.0 on cameras that do not support zooming.
*/
 
/*!
    \property QCamera::minimumZoomFactor
 
    Returns the minimum zoom factor.
 
    This will be \c 1.0 on cameras that do not support zooming.
*/
 
float QCamera::minimumZoomFactor() const
{
    Q_D(const QCamera);
    return d->control ? d->control->minZoomFactor() : 1.f;
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::zoomFactor
 
    Gets or sets the current zoom factor. Values will be clamped between
    \l minimumZoomFactor and \l maximumZoomFactor.
*/
 
/*!
    \property QCamera::zoomFactor
    \brief The current zoom factor.
 
    Gets or sets the current zoom factor. Values will be clamped between
    \l minimumZoomFactor and \l maximumZoomFactor.
*/
float QCamera::zoomFactor() const
{
    Q_D(const QCamera);
    return d->control ? d->control->zoomFactor() : 1.f;
}
/*!
    Zooms to a zoom factor \a factor at a rate of 1 factor per second.
 */
void QCamera::setZoomFactor(float factor)
{
    zoomTo(factor, 0.f);
}
 
/*!
    \qmlmethod void QtMultimedia::Camera::zoomTo(factor, rate)
 
    Zooms to a zoom factor \a factor using \a rate.
 
    The \a rate is specified in powers of two per second. At a rate of 1
    it would take 2 seconds to go from a zoom factor of 1 to 4.
 
    \note Using a specific rate is not supported on all cameras. If not supported,
    zooming will happen as fast as possible.
*/
 
/*!
    Zooms to a zoom factor \a factor using \a rate.
 
    The \a rate is specified in powers of two per second. At a rate of 1
    it would take 2 seconds to go from a zoom factor of 1 to 4.
 
    \note Using a specific rate is not supported on all cameras. If not supported,
    zooming will happen as fast as possible.
*/
void QCamera::zoomTo(float factor, float rate)
{
    Q_ASSERT(rate >= 0.f);
    if (rate < 0.f)
        rate = 0.f;
 
    Q_D(QCamera);
    if (!d->control)
        return;
    factor = qBound(d->control->minZoomFactor(), factor, d->control->maxZoomFactor());
    d->control->zoomTo(factor, rate);
}
 
/*!
    \enum QCamera::FocusMode
 
    \value FocusModeAuto        Continuous auto focus mode.
    \value FocusModeAutoNear    Continuous auto focus mode on near objects.
    \value FocusModeAutoFar     Continuous auto focus mode on objects far away.
    \value FocusModeHyperfocal  Focus to hyperfocal distance, with the maximum depth of field achieved.
                                All objects at distances from half of this
                                distance out to infinity will be acceptably sharp.
    \value FocusModeInfinity    Focus strictly to infinity.
    \value FocusModeManual      Camera lens focus distance is locked according to \l focusDistance.
*/
 
/*!
    \qmlproperty enumeration QtMultimedia::Camera::flashMode
 
    Gets or sets a certain flash mode if the camera has a flash.
 
    Assigning an unsupported mode to this property has no effect.
 
    This property only has an effect when capturing images using
    \l ImageCapture
 
    \qmlenumeratorsfrom QCamera::FlashMode
 
    \sa isFlashModeSupported(), isFlashReady(), flashReady
*/
 
/*!
    \property QCamera::flashMode
    \brief The flash mode being used.
 
    Enables a certain flash mode if the camera has a flash.
 
    Assigning an unsupported mode to this property has no effect.
 
    This property only has an effect when capturing images using
    \l QImageCapture
 
    \sa QCamera::FlashMode, QCamera::isFlashModeSupported, QCamera::isFlashReady
*/
QCamera::FlashMode QCamera::flashMode() const
{
    Q_D(const QCamera);
    return d->control ? d->control->flashMode() : QCamera::FlashOff;
}
 
void QCamera::setFlashMode(QCamera::FlashMode mode)
{
    Q_D(QCamera);
    if (d->control)
        d->control->setFlashMode(mode);
}
 
/*!
    \qmlmethod bool QtMultimedia::Camera::isFlashModeSupported(FlashMode mode)
 
    Returns true if the flash \a mode is supported.
*/
 
/*!
    Returns true if the flash \a mode is supported.
*/
bool QCamera::isFlashModeSupported(QCamera::FlashMode mode) const
{
    Q_D(const QCamera);
    return d->control ? d->control->isFlashModeSupported(mode) : (mode == FlashOff);
}
 
/*!
    \qmlmethod bool QtMultimedia::Camera::isFlashReady()
 
    Returns true if flash is charged.
*/
 
/*!
    Returns true if flash is charged.
*/
bool QCamera::isFlashReady() const
{
    Q_D(const QCamera);
    return d->control ? d->control->isFlashReady() : false;
}
 
/*!
    \qmlproperty enumeration Camera::torchMode
 
    Gets or sets the torch mode being used.
 
    A torch is a continuous source of light. It can be used during video recording in
    low light conditions. Enabling torch mode will usually override any currently set
    flash mode.
 
    \qmlenumeratorsfrom QCamera::TorchMode
 
    \sa isTorchModeSupported(), flashMode
*/
 
/*!
    \property QCamera::torchMode
    \brief The torch mode being used.
 
    A torch is a continuous source of light. It can be used during video recording in
    low light conditions. Enabling torch mode will usually override any currently set
    flash mode.
 
    \sa QCamera::TorchMode, QCamera::isTorchModeSupported, QCamera::flashMode
*/
QCamera::TorchMode QCamera::torchMode() const
{
    Q_D(const QCamera);
    return d->control ? d->control->torchMode() : TorchOff;
}
 
void QCamera::setTorchMode(QCamera::TorchMode mode)
{
    Q_D(QCamera);
    if (d->control)
        d->control->setTorchMode(mode);
}
 
/*!
    \qmlmethod bool QtMultimedia::Camera::isTorchModeSupported(TorchMode mode)
 
    Returns true if the torch \a mode is supported.
*/
 
/*!
    Returns true if the torch \a mode is supported.
*/
bool QCamera::isTorchModeSupported(QCamera::TorchMode mode) const
{
    Q_D(const QCamera);
    return d->control ? d->control->isTorchModeSupported(mode) : (mode == TorchOff);
}
 
/*!
    \qmlproperty enumeration QtMultimedia::Camera::exposureMode
    \brief The exposure mode being used.
 
    \qmlenumeratorsfrom QCamera::ExposureMode
 
    \sa isExposureModeSupported()
*/
 
/*!
    \property QCamera::exposureMode
    \brief The exposure mode being used.
 
    \sa QCamera::isExposureModeSupported
*/
QCamera::ExposureMode QCamera::exposureMode() const
{
    Q_D(const QCamera);
    return d->control ? d->control->exposureMode() : QCamera::ExposureAuto;
}
 
void QCamera::setExposureMode(QCamera::ExposureMode mode)
{
    Q_D(QCamera);
    if (d->control)
        d->control->setExposureMode(mode);
}
 
/*!
    \qmlmethod bool QtMultimedia::Camera::isExposureModeSupported(ExposureMode mode)
 
    Returns true if the exposure \a mode is supported.
*/
 
/*!
    Returns true if the exposure \a mode is supported.
*/
bool QCamera::isExposureModeSupported(QCamera::ExposureMode mode) const
{
    Q_D(const QCamera);
    return d->control && d->control->isExposureModeSupported(mode);
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::exposureCompensation
 
    Gets or sets the exposure compensation in EV units.
 
    Exposure compensation property allows to adjust the automatically calculated
    exposure.
*/
 
/*!
    \property QCamera::exposureCompensation
    \brief Exposure compensation in EV units.
 
    Exposure compensation property allows to adjust the automatically calculated
    exposure.
*/
float QCamera::exposureCompensation() const
{
    Q_D(const QCamera);
    return d->control ? d->control->exposureCompensation() : 0.f;
}
 
void QCamera::setExposureCompensation(float ev)
{
    Q_D(QCamera);
    if (d->control)
        d->control->setExposureCompensation(ev);
}
 
/*!
    \qmlproperty int QtMultimedia::Camera::isoSensitivity
 
    Describes the ISO sensitivity currently used by the camera.
 
*/
 
/*!
    \property QCamera::isoSensitivity
    \brief The sensor ISO sensitivity.
 
    Describes the ISO sensitivity currently used by the camera.
 
    \sa setAutoIsoSensitivity(), setManualIsoSensitivity()
*/
int QCamera::isoSensitivity() const
{
    Q_D(const QCamera);
    return d->control ? d->control->isoSensitivity() : -1;
}
 
/*!
    \qmlproperty int QtMultimedia::Camera::manualIsoSensitivity
 
    Describes a manually set ISO sensitivity
 
    Setting this property to -1 (the default), implies that the camera
    automatically adjusts the ISO sensitivity.
*/
 
/*!
    \property QCamera::manualIsoSensitivity
    \brief Describes a manually set ISO sensitivity
 
    Setting this property to -1 (the default), implies that the camera
    automatically adjusts the ISO sensitivity.
*/
void QCamera::setManualIsoSensitivity(int iso)
{
    Q_D(QCamera);
    if (iso <= 0)
        iso = -1;
    if (d->control)
        d->control->setManualIsoSensitivity(iso);
}
 
int QCamera::manualIsoSensitivity() const
{
    Q_D(const QCamera);
    return d->control ? d->control->manualIsoSensitivity() : 100;
}
 
/*!
     \fn QCamera::setAutoIsoSensitivity()
     Turn on auto sensitivity
*/
 
void QCamera::setAutoIsoSensitivity()
{
    Q_D(QCamera);
    if (d->control)
        d->control->setManualIsoSensitivity(-1);
}
 
/*!
    Returns the minimum ISO sensitivity supported by the camera.
*/
int QCamera::minimumIsoSensitivity() const
{
    Q_D(const QCamera);
    return d->control ? d->control->minIso() : -1;
}
 
/*!
    Returns the maximum ISO sensitivity supported by the camera.
*/
int QCamera::maximumIsoSensitivity() const
{
    Q_D(const QCamera);
    return d->control ? d->control->maxIso() : -1;
}
 
/*!
    The minimal exposure time in seconds.
*/
float QCamera::minimumExposureTime() const
{
    Q_D(const QCamera);
    return d->control ? d->control->minExposureTime() : -1.f;
}
 
/*!
    The maximal exposure time in seconds.
*/
float QCamera::maximumExposureTime() const
{
    Q_D(const QCamera);
    return d->control ? d->control->maxExposureTime() : -1.f;
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::exposureTime
    Returns the Camera's exposure time in seconds.
 
    \sa manualExposureTime
*/
 
/*!
    \property QCamera::exposureTime
    \brief Camera's exposure time in seconds.
 
    \sa minimumExposureTime(), maximumExposureTime(), setManualExposureTime()
*/
 
/*!
    \fn QCamera::exposureTimeChanged(float speed)
 
    Signals that a camera's exposure \a speed has changed.
*/
 
/*!
    Returns the current exposure time in seconds.
*/
 
float QCamera::exposureTime() const
{
    Q_D(const QCamera);
    return d->control ? d->control->exposureTime() : -1;
}
 
/*!
    \qmlproperty real QtMultimedia::Camera::manualExposureTime
 
    Gets or sets a manual exposure time.
 
    Setting this property to -1 (the default) means that the camera
    automatically determines the exposure time.
*/
 
/*!
    \property QCamera::manualExposureTime
 
    Set the manual exposure time to \a seconds
*/
 
void QCamera::setManualExposureTime(float seconds)
{
    Q_D(QCamera);
    if (d->control)
        d->control->setManualExposureTime(seconds);
}
 
/*!
    Returns the manual exposure time in seconds, or -1
    if the camera is using automatic exposure times.
*/
float QCamera::manualExposureTime() const
{
    Q_D(const QCamera);
    return d->control ? d->control->manualExposureTime() : -1;
}
 
/*!
    Use automatically calculated exposure time
*/
void QCamera::setAutoExposureTime()
{
    Q_D(QCamera);
    if (d->control)
        d->control->setManualExposureTime(-1);
}
 
 
/*!
    \enum QCamera::FlashMode
 
    \value FlashOff             Flash is Off.
    \value FlashOn              Flash is On.
    \value FlashAuto            Automatic flash.
*/
 
/*!
    \enum QCamera::TorchMode
 
    \value TorchOff             Torch is Off.
    \value TorchOn              Torch is On.
    \value TorchAuto            Automatic torch.
*/
 
/*!
    \enum QCamera::ExposureMode
 
    \value ExposureAuto          Automatic mode.
    \value ExposureManual        Manual mode.
    \value ExposurePortrait      Portrait exposure mode.
    \value ExposureNight         Night mode.
    \value ExposureSports        Spots exposure mode.
    \value ExposureSnow          Snow exposure mode.
    \value ExposureBeach         Beach exposure mode.
    \value ExposureAction        Action mode. Since 5.5
    \value ExposureLandscape     Landscape mode. Since 5.5
    \value ExposureNightPortrait Night portrait mode. Since 5.5
    \value ExposureTheatre       Theatre mode. Since 5.5
    \value ExposureSunset        Sunset mode. Since 5.5
    \value ExposureSteadyPhoto   Steady photo mode. Since 5.5
    \value ExposureFireworks     Fireworks mode. Since 5.5
    \value ExposureParty         Party mode. Since 5.5
    \value ExposureCandlelight   Candlelight mode. Since 5.5
    \value ExposureBarcode       Barcode mode. Since 5.5
*/
 
/*!
    \qmlproperty bool QtMultimedia::Camera::flashReady
 
    Indicates if the flash is charged and ready to use.
*/
 
/*!
    \property QCamera::flashReady
    \brief Indicates if the flash is charged and ready to use.
*/
 
/*!
    \fn void QCamera::flashReady(bool ready)
 
    Signal the flash \a ready status has changed.
*/
 
/*!
    \fn void QCamera::isoSensitivityChanged(int value)
 
    Signal emitted when sensitivity changes to \a value.
*/
 
/*!
    \fn void QCamera::exposureCompensationChanged(float value)
 
    Signal emitted when the exposure compensation changes to \a value.
*/
 
 
/*!
    \qmlproperty enumeration QtMultimedia::Camera::whiteBalanceMode
 
    Gets or sets the white balance mode being used.
 
    \qmlenumeratorsfrom QCamera::WhiteBalanceMode
 
    \sa isWhiteBalanceModeSupported()
*/
 
/*!
    \property QCamera::whiteBalanceMode
 
    Returns the white balance mode being used.
*/
QCamera::WhiteBalanceMode QCamera::whiteBalanceMode() const
{
    Q_D(const QCamera);
    return d->control ? d->control->whiteBalanceMode() : QCamera::WhiteBalanceAuto;
}
 
/*!
    Sets the white balance to \a mode.
*/
void QCamera::setWhiteBalanceMode(QCamera::WhiteBalanceMode mode)
{
    Q_D(QCamera);
    if (!d->control)
        return;
    if (!d->control->isWhiteBalanceModeSupported(mode))
        return;
    d->control->setWhiteBalanceMode(mode);
    if (mode == QCamera::WhiteBalanceManual)
        d->control->setColorTemperature(5600);
}
 
/*!
    \qmlmethod bool QtMultimedia::Camera::isWhiteBalanceModeSupported(WhiteBalanceMode mode)
 
    Returns true if the white balance \a mode is supported.
*/
 
/*!
    Returns true if the white balance \a mode is supported.
*/
bool QCamera::isWhiteBalanceModeSupported(QCamera::WhiteBalanceMode mode) const
{
    Q_D(const QCamera);
    return d->control && d->control->isWhiteBalanceModeSupported(mode);
}
 
/*!
    \qmlproperty int QtMultimedia::Camera::colorTemperature
 
    Gets or sets the current color temperature.
 
    Setting a color temperature will only have an effect if WhiteBalanceManual is
    supported. In this case, setting a temperature greater 0 will automatically set the
    white balance mode to WhiteBalanceManual. Setting the temperature to 0 will reset
    the white balance mode to WhiteBalanceAuto.
*/
 
/*!
    \property QCamera::colorTemperature
 
    Returns the current color temperature if the
    current white balance mode is \c WhiteBalanceManual. For other modes the
    return value is undefined.
*/
int QCamera::colorTemperature() const
{
    Q_D(const QCamera);
    return d->control ? d->control->colorTemperature() : 0;
}
 
/*!
    Sets manual white balance to \a colorTemperature.  This is used
    when whiteBalanceMode() is set to \c WhiteBalanceManual.  The units are Kelvin.
 
    Setting a color temperature will only have an effect if WhiteBalanceManual is
    supported. In this case, setting a temperature greater 0 will automatically set the
    white balance mode to WhiteBalanceManual. Setting the temperature to 0 will reset
    the white balance mode to WhiteBalanceAuto.
*/
 
void QCamera::setColorTemperature(int colorTemperature)
{
    Q_D(QCamera);
    if (!d->control)
        return;
    if (colorTemperature < 0)
        colorTemperature = 0;
    if (colorTemperature == 0) {
        d->control->setWhiteBalanceMode(WhiteBalanceAuto);
    } else if (!isWhiteBalanceModeSupported(WhiteBalanceManual)) {
        return;
    } else {
        d->control->setWhiteBalanceMode(WhiteBalanceManual);
    }
    d->control->setColorTemperature(colorTemperature);
}
 
/*!
    \enum QCamera::WhiteBalanceMode
 
    \value WhiteBalanceAuto         Auto white balance mode.
    \value WhiteBalanceManual Manual white balance. In this mode the white
    balance should be set with setColorTemperature()
    \value WhiteBalanceSunlight     Sunlight white balance mode.
    \value WhiteBalanceCloudy       Cloudy white balance mode.
    \value WhiteBalanceShade        Shade white balance mode.
    \value WhiteBalanceTungsten     Tungsten (incandescent) white balance mode.
    \value WhiteBalanceFluorescent  Fluorescent white balance mode.
    \value WhiteBalanceFlash        Flash white balance mode.
    \value WhiteBalanceSunset       Sunset white balance mode.
*/
 
/*!
    \fn void QCamera::brightnessChanged()
    \internal
*/
/*!
    \fn void QCamera::contrastChanged()
    \internal
*/
/*!
    \fn void QCamera::hueChanged()
    \internal
*/
/*!
    \fn void QCamera::saturationChanged()
    \internal
*/
QT_END_NAMESPACE
 
#include "moc_qcamera.cpp"