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Diffstat (limited to 'src/multimedia/qcamera.cpp')
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diff --git a/src/multimedia/qcamera.cpp b/src/multimedia/qcamera.cpp new file mode 100644 index 000000000..2b187262b --- /dev/null +++ b/src/multimedia/qcamera.cpp @@ -0,0 +1,1035 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QDebug> + +#include <qcamera.h> + +#include <qmediaobject_p.h> +#include <qcameracontrol.h> +#include <qcameralockscontrol.h> +#include <qcameraexposurecontrol.h> +#include <qcamerafocuscontrol.h> +#include <qmediarecordercontrol.h> +#include <qcameraimageprocessingcontrol.h> +#include <qcameraimagecapturecontrol.h> +#include <qvideodevicecontrol.h> +#include <qvideosurfaceoutput_p.h> + +QT_USE_NAMESPACE + +namespace +{ +class CameraRegisterMetaTypes +{ +public: + CameraRegisterMetaTypes() + { + qRegisterMetaType<QCamera::Error>("QCamera::Error"); + qRegisterMetaType<QCamera::State>("QCamera::State"); + qRegisterMetaType<QCamera::Status>("QCamera::Status"); + qRegisterMetaType<QCamera::CaptureMode>("QCamera::CaptureMode"); + qRegisterMetaType<QCamera::LockType>("QCamera::LockType"); + qRegisterMetaType<QCamera::LockStatus>("QCamera::LockStatus"); + qRegisterMetaType<QCamera::LockChangeReason>("QCamera::LockChangeReason"); + } +} _registerCameraMetaTypes; +} + + +/*! + \class QCamera + + + \brief The QCamera class provides interface for system camera devices. + + \inmodule QtMultimedia + \ingroup camera + \since 1.1 + + QCamera can be used with QVideoWidget for viewfinder display, + QMediaRecorder for video recording and QCameraImageCapture for image taking. + + \snippet doc/src/snippets/multimedia-snippets/media.cpp Request control + +*/ + + +class QCameraPrivate : public QMediaObjectPrivate +{ + Q_DECLARE_NON_CONST_PUBLIC(QCamera) +public: + QCameraPrivate(): + QMediaObjectPrivate(), + provider(0), + control(0), + deviceControl(0), + viewfinder(0), + capture(0), + state(QCamera::UnloadedState), + error(QCamera::NoError), + supportedLocks(QCamera::NoLock), + requestedLocks(QCamera::NoLock), + lockStatus(QCamera::Unlocked), + lockChangeReason(QCamera::UserRequest), + supressLockChangedSignal(false), + restartPending(false) + { + } + + void initControls(); + + QMediaServiceProvider *provider; + + QCameraControl *control; + QVideoDeviceControl *deviceControl; + QCameraLocksControl *locksControl; + + QCameraExposure *cameraExposure; + QCameraFocus *cameraFocus; + QCameraImageProcessing *imageProcessing; + + QObject *viewfinder; + QObject *capture; + + QCamera::State state; + + QCamera::Error error; + QString errorString; + + QCamera::LockTypes supportedLocks; + QCamera::LockTypes requestedLocks; + + QCamera::LockStatus lockStatus; + QCamera::LockChangeReason lockChangeReason; + bool supressLockChangedSignal; + + bool restartPending; + + QVideoSurfaceOutput surfaceViewfinder; + + void _q_error(int error, const QString &errorString); + void unsetError() { error = QCamera::NoError; errorString.clear(); } + + void setState(QCamera::State); + + void _q_updateLockStatus(QCamera::LockType, QCamera::LockStatus, QCamera::LockChangeReason); + void _q_updateState(QCamera::State newState); + void _q_preparePropertyChange(int changeType); + void _q_restartCamera(); + void updateLockStatus(); +}; + + +void QCameraPrivate::_q_error(int error, const QString &errorString) +{ + Q_Q(QCamera); + + this->error = QCamera::Error(error); + this->errorString = errorString; + + qWarning() << "Camera error:" << errorString; + + emit q->error(this->error); +} + +void QCameraPrivate::setState(QCamera::State newState) +{ + Q_Q(QCamera); + + unsetError(); + + if (!control) { + _q_error(QCamera::ServiceMissingError, q_ptr->tr("The camera service is missing")); + return; + } + + if (state == newState) + return; + + restartPending = false; + state = newState; + control->setState(state); + emit q->stateChanged(state); +} + +void QCameraPrivate::_q_updateState(QCamera::State newState) +{ + Q_Q(QCamera); + + //omit changins state to Loaded when the camera is temporarily + //stopped to apply shanges + if (restartPending) + return; + + if (newState != state) { + qDebug() << "Camera state changed:" << newState; + state = newState; + emit q->stateChanged(state); + } +} + +void QCameraPrivate::_q_preparePropertyChange(int changeType) +{ + if (!control) + return; + + QCamera::Status status = control->status(); + + //all the changes are allowed until the camera is starting + if (control->state() != QCamera::ActiveState) + return; + + if (control->canChangeProperty(QCameraControl::PropertyChangeType(changeType), status)) + return; + + restartPending = true; + control->setState(QCamera::LoadedState); + QMetaObject::invokeMethod(q_ptr, "_q_restartCamera", Qt::QueuedConnection); +} + +void QCameraPrivate::_q_restartCamera() +{ + if (restartPending) { + restartPending = false; + control->setState(QCamera::ActiveState); + } +} + +void QCameraPrivate::initControls() +{ + Q_Q(QCamera); + + supportedLocks = 0; + + if (service) { + control = qobject_cast<QCameraControl *>(service->requestControl(QCameraControl_iid)); + locksControl = qobject_cast<QCameraLocksControl *>(service->requestControl(QCameraLocksControl_iid)); + deviceControl = qobject_cast<QVideoDeviceControl*>(service->requestControl(QVideoDeviceControl_iid)); + + if (control) { + q->connect(control, SIGNAL(stateChanged(QCamera::State)), q, SLOT(_q_updateState(QCamera::State))); + q->connect(control, SIGNAL(statusChanged(QCamera::Status)), q, SIGNAL(statusChanged(QCamera::Status))); + q->connect(control, SIGNAL(captureModeChanged(QCamera::CaptureMode)), + q, SIGNAL(captureModeChanged(QCamera::CaptureMode))); + q->connect(control, SIGNAL(error(int,QString)), q, SLOT(_q_error(int,QString))); + + } + + if (locksControl) { + q->connect(locksControl, SIGNAL(lockStatusChanged(QCamera::LockType,QCamera::LockStatus,QCamera::LockChangeReason)), + q, SLOT(_q_updateLockStatus(QCamera::LockType,QCamera::LockStatus,QCamera::LockChangeReason))); + supportedLocks = locksControl->supportedLocks(); + } + + error = QCamera::NoError; + } else { + control = 0; + locksControl = 0; + deviceControl = 0; + + error = QCamera::ServiceMissingError; + errorString = QCamera::tr("The camera service is missing"); + } +} + +void QCameraPrivate::updateLockStatus() +{ + Q_Q(QCamera); + + QCamera::LockStatus oldStatus = lockStatus; + + QMap<QCamera::LockStatus, int> lockStatusPriority; + lockStatusPriority.insert(QCamera::Locked, 1); + lockStatusPriority.insert(QCamera::Searching, 2); + lockStatusPriority.insert(QCamera::Unlocked, 3); + + lockStatus = requestedLocks ? QCamera::Locked : QCamera::Unlocked; + int priority = 0; + + QList<QCamera::LockStatus> lockStatuses; + + if (requestedLocks & QCamera::LockFocus) + lockStatuses << q->lockStatus(QCamera::LockFocus); + + if (requestedLocks & QCamera::LockExposure) + lockStatuses << q->lockStatus(QCamera::LockExposure); + + if (requestedLocks & QCamera::LockWhiteBalance) + lockStatuses << q->lockStatus(QCamera::LockWhiteBalance); + + + foreach (QCamera::LockStatus currentStatus, lockStatuses) { + int currentPriority = lockStatusPriority.value(currentStatus, -1); + if (currentPriority > priority) { + priority = currentPriority; + lockStatus = currentStatus; + } + } + + if (!supressLockChangedSignal && oldStatus != lockStatus) { + emit q->lockStatusChanged(lockStatus, lockChangeReason); + + if (lockStatus == QCamera::Locked) + emit q->locked(); + else if (lockStatus == QCamera::Unlocked && lockChangeReason == QCamera::LockFailed) + emit q->lockFailed(); + } +/* + qDebug() << "Requested locks:" << (requestedLocks & QCamera::LockExposure ? 'e' : ' ') + << (requestedLocks & QCamera::LockFocus ? 'f' : ' ') + << (requestedLocks & QCamera::LockWhiteBalance ? 'w' : ' '); + qDebug() << "Lock status: f:" << q->lockStatus(QCamera::LockFocus) + << " e:" << q->lockStatus(QCamera::LockExposure) + << " w:" << q->lockStatus(QCamera::LockWhiteBalance) + << " composite:" << lockStatus; +*/ +} + +void QCameraPrivate::_q_updateLockStatus(QCamera::LockType type, QCamera::LockStatus status, QCamera::LockChangeReason reason) +{ + Q_Q(QCamera); + lockChangeReason = reason; + updateLockStatus(); + emit q->lockStatusChanged(type, status, reason); +} + + +/*! + Construct a QCamera from service \a provider and \a parent. +*/ + +QCamera::QCamera(QObject *parent, QMediaServiceProvider *provider): + QMediaObject(*new QCameraPrivate, parent, provider->requestService(Q_MEDIASERVICE_CAMERA)) +{ + Q_D(QCamera); + d->provider = provider; + d->initControls(); + d->cameraExposure = new QCameraExposure(this); + d->cameraFocus = new QCameraFocus(this); + d->imageProcessing = new QCameraImageProcessing(this); +} + +/*! + Construct a QCamera from device name \a device and \a parent. +*/ + +QCamera::QCamera(const QByteArray& device, QObject *parent): + QMediaObject(*new QCameraPrivate, parent, + QMediaServiceProvider::defaultServiceProvider()->requestService(Q_MEDIASERVICE_CAMERA, QMediaServiceProviderHint(device))) +{ + Q_D(QCamera); + d->provider = QMediaServiceProvider::defaultServiceProvider(); + d->initControls(); + + if (d->service != 0) { + //pass device name to service + if (d->deviceControl) { + QString deviceName = QString::fromLatin1(device); + + for (int i=0; i<d->deviceControl->deviceCount(); i++) { + if (d->deviceControl->deviceName(i) == deviceName) { + d->deviceControl->setSelectedDevice(i); + break; + } + } + } + } + + d->cameraExposure = new QCameraExposure(this); + d->cameraFocus = new QCameraFocus(this); + d->imageProcessing = new QCameraImageProcessing(this); +} + +/*! + Destroys the camera object. +*/ + +QCamera::~QCamera() +{ + Q_D(QCamera); + delete d->cameraExposure; + d->cameraExposure = 0; + delete d->cameraFocus; + d->cameraFocus = 0; + delete d->imageProcessing; + d->imageProcessing = 0; + + if (d->service) { + if (d->control) + d->service->releaseControl(d->control); + if (d->locksControl) + d->service->releaseControl(d->locksControl); + if (d->deviceControl) + d->service->releaseControl(d->deviceControl); + + d->provider->releaseService(d->service); + } +} + + +/*! + Return true if the camera service is ready to use. + \since 1.1 +*/ +bool QCamera::isAvailable() const +{ + return availabilityError() == QtMultimedia::NoError; +} + +/*! + Returns the error state of the camera service. + \since 1.1 +*/ + +QtMultimedia::AvailabilityError QCamera::availabilityError() const +{ + Q_D(const QCamera); + if (d->control == NULL) + return QtMultimedia::ServiceMissingError; + + if (d->deviceControl && d->deviceControl->deviceCount() == 0) + return QtMultimedia::ResourceError; + + if (d->error != QCamera::NoError) + return QtMultimedia::ResourceError; + + return QtMultimedia::NoError; +} + + +/*! + Returns the camera exposure control object. + \since 1.1 +*/ +QCameraExposure *QCamera::exposure() const +{ + return d_func()->cameraExposure; +} + +/*! + Returns the camera focus control object. + \since 1.1 +*/ +QCameraFocus *QCamera::focus() const +{ + return d_func()->cameraFocus; +} + +/*! + Returns the camera image processing control object. + \since 1.1 +*/ +QCameraImageProcessing *QCamera::imageProcessing() const +{ + return d_func()->imageProcessing; +} + +/*! + Sets the QVideoWidget based camera \a viewfinder. + The previously set viewfinder is detached. + \since 1.1 +*/ + +// QVideoWidget is forward declared +void QCamera::setViewfinder(QVideoWidget *viewfinder) +{ + Q_D(QCamera); + d->_q_preparePropertyChange(QCameraControl::Viewfinder); + + if (d->viewfinder) + unbind(d->viewfinder); + + // We don't know (in this library) that QVideoWidget inherits QObject + QObject *viewFinderObject = reinterpret_cast<QObject*>(viewfinder); + + d->viewfinder = viewFinderObject && bind(viewFinderObject) ? viewFinderObject : 0; +} + +/*! + Sets the QGraphicsVideoItem based camera \a viewfinder. + The previously set viewfinder is detached. + \since 1.1 +*/ +// QGraphicsVideoItem is forward declared +void QCamera::setViewfinder(QGraphicsVideoItem *viewfinder) +{ + Q_D(QCamera); + d->_q_preparePropertyChange(QCameraControl::Viewfinder); + + if (d->viewfinder) + unbind(d->viewfinder); + + // We don't know (in this library) that QGraphicsVideoItem (multiply) inherits QObject + // but QObject inheritance depends on QObject coming first, so try this out. + QObject *viewFinderObject = reinterpret_cast<QObject*>(viewfinder); + + d->viewfinder = viewFinderObject && bind(viewFinderObject) ? viewFinderObject : 0; +} + +/*! + Sets a video \a surface as the viewfinder of a camera. + + If a viewfinder has already been set on the camera the new surface + will replace it. + \since 1.2 +*/ + +void QCamera::setViewfinder(QAbstractVideoSurface *surface) +{ + Q_D(QCamera); + + d->surfaceViewfinder.setVideoSurface(surface); + + if (d->viewfinder != &d->surfaceViewfinder) { + if (d->viewfinder) + unbind(d->viewfinder); + + d->viewfinder = bind(&d->surfaceViewfinder) ? &d->surfaceViewfinder : 0; + } +} + +/*! + Returns the error state of the object. + \since 1.1 +*/ + +QCamera::Error QCamera::error() const +{ + return d_func()->error; +} + +/*! + Returns a string describing a camera's error state. + \since 1.1 +*/ +QString QCamera::errorString() const +{ + return d_func()->errorString; +} + + +/*! + Returns true if the capture \a mode is suported. + \since 1.1 +*/ +bool QCamera::isCaptureModeSupported(QCamera::CaptureMode mode) const +{ + return d_func()->control ? d_func()->control->isCaptureModeSupported(mode) : false; +} + +/*! + \property QCamera::captureMode + + The type of media (video or still images), + the camera is configured to capture. + + It's allowed to change capture mode in any camera state, + but if the camera is currently active, + chaging capture mode is likely to lead to camera status + chaged to QCamera::LoadedStatus, QCamera::LoadingStatus, + and when the camera is ready to QCamera::ActiveStatus. + \since 1.1 +*/ + +QCamera::CaptureMode QCamera::captureMode() const +{ + return d_func()->control ? d_func()->control->captureMode() : QCamera::CaptureStillImage; +} + +void QCamera::setCaptureMode(QCamera::CaptureMode mode) +{ + Q_D(QCamera); + + if (mode != captureMode()) { + if (d->control) { + d->_q_preparePropertyChange(QCameraControl::CaptureMode); + d->control->setCaptureMode(mode); + } + } +} + + +/*! + Starts the camera. + + State is changed to QCamera::ActiveState if camera is started + successfully, otherwise error() signal is emitted. + + While the camera state is changed to QCamera::ActiveState, + starting the camera service can be asynchronous with the actual + status reported with QCamera::status property. + \since 1.1 +*/ +void QCamera::start() +{ + Q_D(QCamera); + d->setState(QCamera::ActiveState); +} + +/*! + Stops the camera. + The camera state is changed from QCamera::ActiveState to QCamera::LoadedState. + \since 1.1 +*/ +void QCamera::stop() +{ + Q_D(QCamera); + d->setState(QCamera::LoadedState); +} + +/*! + Open the camera device. + The camera state is changed to QCamera::LoadedStatus. + + It's not necessary to explcitly load the camera, + unless unless the application have to read the supported camera + settings and change the default depending on the camera capabilities. + + In all the other cases it's possible to start the camera directly + from unloaded state. + \since 1.1 +*/ +void QCamera::load() +{ + Q_D(QCamera); + d->setState(QCamera::LoadedState); +} + +/*! + Close the camera device and deallocate the related resources. + The camera state is changed to QCamera::UnloadedStatus. + \since 1.1 +*/ +void QCamera::unload() +{ + Q_D(QCamera); + d->setState(QCamera::UnloadedState); +} + + +/*! + Returns a list of camera device's available from the default service provider. + \since 1.1 +*/ + +QList<QByteArray> QCamera::availableDevices() +{ + return QMediaServiceProvider::defaultServiceProvider()->devices(QByteArray(Q_MEDIASERVICE_CAMERA)); +} + +/*! + Returns the description of the \a device. + \since 1.1 +*/ + +QString QCamera::deviceDescription(const QByteArray &device) +{ + return QMediaServiceProvider::defaultServiceProvider()->deviceDescription(QByteArray(Q_MEDIASERVICE_CAMERA), device); +} + +QCamera::State QCamera::state() const +{ + return d_func()->state; +} + +QCamera::Status QCamera::status() const +{ + if(d_func()->control) + return (QCamera::Status)d_func()->control->status(); + + return QCamera::UnavailableStatus; +} + + +/*! + Returns the lock types, camera supports. + \since 1.1 +*/ +QCamera::LockTypes QCamera::supportedLocks() const +{ + return d_func()->supportedLocks; +} + +/*! + Returns the requested lock types. + \since 1.1 +*/ +QCamera::LockTypes QCamera::requestedLocks() const +{ + return d_func()->requestedLocks; +} + +/*! + Returns the status of requested camera settings locks. + \since 1.1 +*/ +QCamera::LockStatus QCamera::lockStatus() const +{ + return d_func()->lockStatus; +} + +/*! + Returns the status of camera settings \a lock. + \since 1.1 +*/ +QCamera::LockStatus QCamera::lockStatus(QCamera::LockType lockType) const +{ + const QCameraPrivate *d = d_func(); + + if (!(lockType & d->supportedLocks)) + return lockType & d->requestedLocks ? QCamera::Locked : QCamera::Unlocked; + + if (!(lockType & d->requestedLocks)) + return QCamera::Unlocked; + + if (d->locksControl) + return d->locksControl->lockStatus(lockType); + + return QCamera::Unlocked; +} + +/*! + \fn void QCamera::searchAndLock(QCamera::LockTypes locks) + + Locks the camera settings with the requested \a locks, including focusing in the single autofocus mode, + exposure and white balance if the exposure and white balance modes are not manual. + + The camera settings are usually locked before taking one or multiple still images, + in responce to the shutter button being half pressed. + + The QCamera::locked() signal is emitted when camera settings are successfully locked, + otherwise QCamera::lockFailed() is emitted. + + QCamera also emits lockStatusChanged(QCamera::LockType, QCamera::LockStatus) + on individual lock status changes and lockStatusChanged(QCamera::LockStatus) signal on composite status changes. + + Locking serves two roles: it initializes calculation of automatic parameter + (focusing, calculating the correct exposure and white balance) and allows + to keep some or all of those parameters during number of shots. + + If the camera doesn't support keeping one of parameters between shots, the related + lock state changes to QCamera::Unlocked. + + It's also acceptable to relock already locked settings, + depending on the lock parameter this initiates new focusing, exposure or white balance calculation. + \since 1.1 + */ +void QCamera::searchAndLock(QCamera::LockTypes locks) +{ + Q_D(QCamera); + + QCamera::LockStatus oldStatus = d->lockStatus; + d->supressLockChangedSignal = true; + + d->requestedLocks |= locks; + + locks &= d->supportedLocks; + + if (d->locksControl) + d->locksControl->searchAndLock(locks); + + d->supressLockChangedSignal = false; + + d->lockStatus = oldStatus; + d->updateLockStatus(); +} + +/*! + Lock all the supported camera settings. + \since 1.1 + */ +void QCamera::searchAndLock() +{ + searchAndLock(LockExposure | LockWhiteBalance | LockFocus); +} + +/*! + Unlocks the camera settings specified with \a locks or cancel the current locking if one is active. + \since 1.1 + */ +void QCamera::unlock(QCamera::LockTypes locks) +{ + Q_D(QCamera); + + QCamera::LockStatus oldStatus = d->lockStatus; + d->supressLockChangedSignal = true; + + d->requestedLocks &= ~locks; + + locks &= d->supportedLocks; + + if (d->locksControl) + d->locksControl->unlock(locks); + + d->supressLockChangedSignal = false; + + d->lockStatus = oldStatus; + d->updateLockStatus(); +} + +/*! + Unlock all the requested camera locks. + \since 1.1 + */ +void QCamera::unlock() +{ + unlock(d_func()->requestedLocks); +} + + +/*! + \enum QCamera::State + \value UnloadedState + The initial camera state, with camera not loaded, + the camera capabilities except of supported capture modes + are unknown. + + While the supported settings are unknown in this state, + it's allowed to set the camera capture settings like codec, + resolution, or frame rate. + + \value LoadedState + The camera is loaded and ready to be configured. + + In the Idle state it's allowed to query camera capabilities, + set capture resolution, codecs, etc. + + The viewfinder is not active in the loaded state. + + \value ActiveState + In the active state as soon as camera is started + the viewfinder displays video frames and the + camera is ready for capture. +*/ + + +/*! + \property QCamera::state + \brief The current state of the camera object. + \since 1.1 +*/ + +/*! + \enum QCamera::Status + \value ActiveStatus + The camera has been started and can produce data. + The viewfinder displays video frames in active state. + + Depending on backend, changing some camera settings like + capture mode, codecs or resolution in ActiveState may lead + to changing the camera status to LoadedStatus and StartingStatus while + the settings are applied and back to ActiveStatus when the camera is ready. + + \value StartingStatus + The camera is starting in result of state transition to QCamera::ActiveState. + The camera service is not ready to capture yet. + + \value StandbyStatus + The camera is in the power saving standby mode. + The camera may come to the standby mode after some time of inactivity + in the QCamera::LoadedState state. + + \value LoadedStatus + The camera is loaded and ready to be configured. + This status indicates the camera device is opened and + it's possible to query for supported image and video capture settings, + like resolution, framerate and codecs. + + \value LoadingStatus + The camera device loading in result of state transition from + QCamera::UnloadedState to QCamera::LoadedState or QCamera::ActiveState. + + \value UnloadedStatus + The initial camera status, with camera not loaded. + The camera capabilities including supported capture settings may be unknown. + + \value UnavailableStatus + The camera or camera backend is not available. +*/ + + +/*! + \property QCamera::status + \brief The current status of the camera object. + \since 1.1 +*/ + + +/*! + \enum QCamera::CaptureMode + \value CaptureStillImage Camera is configured for still frames capture. + \value CaptureVideo Camera is configured for video capture. + \since 1.1 +*/ + +/*! + \enum QCamera::LockType + + \value NoLock + \value LockExposure + Lock camera exposure. + \value LockWhiteBalance + Lock the white balance. + \value LockFocus + Lock camera focus. +*/ + + +/*! + \property QCamera::lockStatus + \brief The overall status for all the requested camera locks. + \since 1.1 +*/ + +/*! + \fn void QCamera::locked() + + Signals all the requested camera settings are locked. + \since 1.1 +*/ + +/*! + \fn void QCamera::lockFailed() + + Signals locking of at least one requested camera settings failed. + \since 1.1 +*/ + +/*! + \fn QCamera::lockStatusChanged(QCamera::LockStatus status, QCamera::LockChangeReason reason) + + Signals the overall \a status for all the requested camera locks was changed with specified \a reason. + \since 1.1 +*/ + +/*! + \fn QCamera::lockStatusChanged(QCamera::LockType lock, QCamera::LockStatus status, QCamera::LockChangeReason reason) + Signals the \a lock \a status was changed with specified \a reason. + \since 1.1 +*/ + +/*! + \enum QCamera::LockStatus + \value Unlocked + The application is not interested in camera settings value. + The camera may keep this parameter without changes, this is common with camera focus, + or adjust exposure and white balance constantly to keep the viewfinder image nice. + + \value Searching + The application has requested the camera focus, exposure or white balance lock with + QCamera::searchAndLock(). This state indicates the camera is focusing or calculating exposure and white balance. + + \value Locked + The camera focus, exposure or white balance is locked. + The camera is ready to capture, application may check the exposure parameters. + + The locked state usually means the requested parameter stays the same, + except of the cases when the parameter is requested to be constantly updated. + For example in continuous focusing mode, the focus is considered locked as long + and the object is in focus, even while the actual focusing distance may be constantly changing. +*/ + +/*! + \enum QCamera::LockChangeReason + + \value UserRequest + The lock status changed in result of user request, usually to unlock camera settings. + \value LockAcquired + The lock status successfuly changed to QCamera::Locked. + \value LockFailed + The camera failed to acquire the requested lock in result of + autofocus failure, exposure out of supported range, etc. + \value LockLost + The camera is not able to maintain the requested lock any more. + Lock status is changed to QCamera::Unlocked. + \value LockTemporaryLost + The lock is lost, but the camera is working hard to reacquire it. + This value may be used in continuous focusing mode, + when the camera loses the focus, the focus lock state is changed to Qcamera::Searching + with LockTemporaryLost reason. +*/ + +/*! + \enum QCamera::Error + + \value NoError No errors have occurred. + \value CameraError An error has occurred. + \value InvalidRequestError System resource doesn't support requested functionality. + \value ServiceMissingError No camera service available. + \value NotSupportedFeatureError The feature is not supported. +*/ + +/*! + \fn void QCamera::error(QCamera::Error value) + + Signal emitted when error state changes to \a value. + \since 1.1 +*/ + +/*! + \fn void QCamera::captureModeChanged(QCamera::CaptureMode mode) + + Signals the capture \a mode has changed. + \since 1.1 +*/ + +/*! + \fn QCamera::stateChanged(QCamera::State state) + + Signals the camera \a state has changed. + + Usually the state changes is caused by calling + load(), unload(), start() and stop(), + but the state can also be changed change as a result of camera error. + \since 1.1 +*/ + +/*! + \fn QCamera::statusChanged(QCamera::Status status) + + Signals the camera \a status has changed. + + \since 1.1 +*/ + + +#include "moc_qcamera.cpp" |