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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 <private/qplatformcamera_p.h>
#include <sys/time.h>
QT_BEGIN_NAMESPACE
class QV4L2FileDescriptor;
class QV4L2MemoryTransfer;
class QSocketNotifier;
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 QV4L2Camera : public QPlatformCamera
{
Q_OBJECT
public:
explicit QV4L2Camera(QCamera *parent);
~QV4L2Camera();
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;
};
QT_END_NAMESPACE
#endif // QV4L2CAMERA_H
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