camerauis/cameraxui/cxengine/inc/api/cxecameradevicecontrol.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 31 Aug 2010 15:03:46 +0300
branchRCL_3
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permissions -rw-r--r--
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#ifndef CXECAMERADEVICECONTROL_H
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#define CXECAMERADEVICECONTROL_H
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#include <QObject>
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#include "cxenamespace.h"
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#include "cxeerror.h"
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class CxeViewfinderControl;
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/**
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 * CxeCameraDeviceControl is responsible for reserving and powering on the camera module.
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 * It also routes all camera adaptation events to other engine internal controls.
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 * The device control API is also used to control the operating mode (Cxe::CameraMode) of
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 * the engine
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 */
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class CxeCameraDeviceControl : public QObject
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{
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    Q_OBJECT
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public:
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    /**
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     * Camera device control state.
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     */
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    enum State
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        {
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        //! Camera power off/unreserved
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        Idle            = 0x01,
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        //! Reserving and powering on camera
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        Initializing    = 0x02,
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        //! Camera device is reserved and powered on
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        Ready           = 0x04,
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        //! Camera device release pending
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        PendingRelease  = 0x08
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        };
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    /**
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     * Get current camera mode.
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     */
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    virtual Cxe::CameraMode mode() const = 0;
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    /**
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     * Set current camera mode.
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     */
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    virtual void setMode(Cxe::CameraMode mode) = 0;
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    virtual void init() = 0;
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    /**
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     * Reserve camera device for exclusive use.
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     */
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    virtual void reserve() = 0;
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    /**
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     * Cancel all operations and release camera for other applications to use.
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     * Camera module is also powered off.
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     */
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    virtual void release() = 0;
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    /**
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     * Get current camera index (primary or secondary).
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     *
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     * @return Current camera index
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     */
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    virtual Cxe::CameraIndex cameraIndex() const = 0;
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    /**
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     * Switch between primary and secondary camera.
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     *
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     * @param index New camera index
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     */
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    virtual CxeError::Id switchCamera(Cxe::CameraIndex index) = 0;
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    /**
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     * Get current device control state.
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     *
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     * @return Current state
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     */
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    virtual State state() const = 0;
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signals:
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    /**
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     * Initializing current mode has completed. The engine is now ready to capture
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     * images or videos (unless a non-zero error code was given.
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     *
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     * @param error Error code
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     */
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    void initModeComplete(CxeError::Id error);
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    /**
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     * Camera device control state has changed.
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     *
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     * @param newState New device control state
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     * @param error    Error code
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     */
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    void stateChanged(CxeCameraDeviceControl::State newState, CxeError::Id error);
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protected:
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    CxeCameraDeviceControl() {}
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private:
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    Q_DISABLE_COPY(CxeCameraDeviceControl)
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};
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Q_DECLARE_METATYPE(CxeCameraDeviceControl::State)
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#endif // CXECAMERADEVICECONTROL_H