qv4l2camera_p.h - mozsearch

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// Copyright (C) 2021 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

#ifndef QV4L2CAMERA_H

#define QV4L2CAMERA_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtMultimedia/private/qplatformcamera_p.h>

#include <sys/time.h>

QT_BEGIN_NAMESPACE

class QSocketNotifier;

namespace QtV4L2 {

class QV4L2FileDescriptor;

class QV4L2MemoryTransfer;

struct V4L2CameraInfo

    bool formatInitialized = false;

    bool autoWhiteBalanceSupported = false;

    bool colorTemperatureSupported = false;

    bool autoExposureSupported = false;

    bool manualExposureSupported = false;

    bool flashSupported = false;

    bool torchSupported = false;

    qint32 minColorTemp = 5600; // Daylight...

    qint32 maxColorTemp = 5600;

    qint32 minExposure = 0;

    qint32 maxExposure = 0;

    qint32 minExposureAdjustment = 0;

    qint32 maxExposureAdjustment = 0;

    qint32 minFocus = 0;

    qint32 maxFocus = 0;

    qint32 rangedFocus = false;

    int minZoom = 0;

    int maxZoom = 0;

};

QVideoFrameFormat::PixelFormat formatForV4L2Format(uint32_t v4l2Format);

uint32_t v4l2FormatForPixelFormat(QVideoFrameFormat::PixelFormat format);

class Q_MULTIMEDIA_EXPORT QV4L2Camera : public QPlatformCamera

    Q_OBJECT

public:

    explicit QV4L2Camera(QCamera *parent);

    ~QV4L2Camera() override;

    bool isActive() const override;

    void setActive(bool active) override;

    void setCamera(const QCameraDevice &camera) override;

    bool setCameraFormat(const QCameraFormat &format) override;

    bool resolveCameraFormat(const QCameraFormat &format);

    bool isFocusModeSupported(QCamera::FocusMode mode) const override;

    void setFocusMode(QCamera::FocusMode /*mode*/) override;

    //    void setCustomFocusPoint(const QPointF &/*point*/) override;

    void setFocusDistance(float) override;

    void zoomTo(float /*newZoomFactor*/, float /*rate*/ = -1.) override;

    void setFlashMode(QCamera::FlashMode /*mode*/) override;

    bool isFlashModeSupported(QCamera::FlashMode mode) const override;

    bool isFlashReady() const override;

    void setTorchMode(QCamera::TorchMode /*mode*/) override;

    bool isTorchModeSupported(QCamera::TorchMode mode) const override;

    void setExposureMode(QCamera::ExposureMode) override;

    bool isExposureModeSupported(QCamera::ExposureMode mode) const override;

    void setExposureCompensation(float) override;

    int isoSensitivity() const override;

    void setManualIsoSensitivity(int) override;

    void setManualExposureTime(float) override;

    float exposureTime() const override;

    bool isWhiteBalanceModeSupported(QCamera::WhiteBalanceMode mode) const override;

    void setWhiteBalanceMode(QCamera::WhiteBalanceMode /*mode*/) override;

    void setColorTemperature(int /*temperature*/) override;

    QVideoFrameFormat frameFormat() const override;

private Q_SLOTS:

    void readFrame();

private:

    void setCameraBusy();

    void initV4L2Controls();

    void closeV4L2Fd();

    int setV4L2ColorTemperature(int temperature);

    bool setV4L2Parameter(quint32 id, qint32 value);

    int getV4L2Parameter(quint32 id) const;

    void setV4L2CameraFormat();

    void initV4L2MemoryTransfer();

    void startCapturing();

    void stopCapturing();

private:

    bool m_active = false;

    QCameraDevice m_cameraDevice;

    std::unique_ptr<QSocketNotifier> m_notifier;

    std::unique_ptr<QV4L2MemoryTransfer> m_memoryTransfer;

    std::shared_ptr<QV4L2FileDescriptor> m_v4l2FileDescriptor;

    V4L2CameraInfo m_v4l2Info;

    timeval m_firstFrameTime = { -1, -1 };

    quint32 m_bytesPerLine = 0;

    quint32 m_imageSize = 0;

    QVideoFrameFormat::ColorSpace m_colorSpace = QVideoFrameFormat::ColorSpace_Undefined;

    qint64 m_frameDuration = -1;

    bool m_cameraBusy = false;

};

} // namespace QtV4L2

QT_END_NAMESPACE

#endif // QV4L2CAMERA_H