qlibcamera_camera_p.h

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// Copyright (C) 2026 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 QLIBCAMERA_CAMERA_P_H
#define QLIBCAMERA_CAMERA_P_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 "qlibcamera_stream_p.h"                        // for the full QLibCameraCameraStream definition
 
#include <QtMultimedia/private/qplatformcamera_p.h>
#include <QtCore/private/qexpected_p.h>
 
#include <memory>
#include <tuple>
#include <utility>
#include <vector>
 
namespace libcamera {
class Camera;
class CameraConfiguration;
class FrameBufferAllocator;
class Request;
} // namespace libcamera
 
QT_BEGIN_NAMESPACE
 
namespace QLibCamera {
 
class QLibCameraInstance;
 
class QLibCameraCamera final : public QPlatformCamera
{
    Q_OBJECT
public:
    explicit QLibCameraCamera(QCamera *parent, std::shared_ptr<QLibCameraInstance>);
    ~QLibCameraCamera() override;
 
    bool isActive() const override { return m_active; }
    void setActive(bool active) override;
 
    void setCamera(const QCameraDevice &) override;
    bool setCameraFormat(const QCameraFormat &) override;
 
    void setExposureMode(QCamera::ExposureMode) override;
    bool isExposureModeSupported(QCamera::ExposureMode mode) const override;
    void setExposureCompensation(float compensation) override;
    void setManualIsoSensitivity(int iso) override;
    void setManualExposureTime(float seconds) override;
 
    void setWhiteBalanceMode(QCamera::WhiteBalanceMode) override;
    void setColorTemperature(int temperature) override;
 
    void zoomTo(float newZoomFactor, float rate = -1.) override;
 
    QVideoFrameFormat frameFormat() const override;
 
private:
    int cameraPixelFormatScore(QVideoFrameFormat::PixelFormat,
                               QVideoFrameFormat::ColorRange) const override;
 
    using StartCapturingResult = q23::expected<void, std::tuple<QCamera::Error, QString>>;
 
    StartCapturingResult startCapturing();
    void startCapturingReportingErrors();
    void stopCapturing();
 
    template <typename Fn>
    void withPendingControls(Fn &&fn)
    {
        if (m_stream)
            m_stream->withPendingControls(std::forward<Fn>(fn));
    }
 
    // Lifecycle of the libcamera stream
    enum class StreamState : uint8_t {
        Idle,
        Acquired,
        Running,
    };
 
    std::shared_ptr<QLibCameraInstance> m_instance;
    std::shared_ptr<libcamera::Camera> m_camera;
    std::unique_ptr<QLibCameraCameraStream> m_stream;
 
    QCameraDevice m_cameraDevice;
    bool m_active = false;
    StreamState m_streamState = StreamState::Idle;
 
    std::unique_ptr<libcamera::CameraConfiguration> m_config;
    std::unique_ptr<libcamera::FrameBufferAllocator> m_allocator;
    std::vector<std::unique_ptr<libcamera::Request>> m_requests;
 
    int m_stride = 0;
    QVideoFrameFormat::ColorSpace m_colorSpace = QVideoFrameFormat::ColorSpace_Undefined;
    QVideoFrameFormat::ColorRange m_colorRange = QVideoFrameFormat::ColorRange_Unknown;
};
 
} // namespace QLibCamera
 
QT_END_NAMESPACE
 
#endif // QLIBCAMERA_CAMERA_P_H