qavfcamerarotationtracker_p.h

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// Copyright (C) 2025 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 QAVFCAMERAROTATIONTRACKER_P_H
#define QAVFCAMERAROTATIONTRACKER_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 <QtCore/qtclasshelpermacros.h>
#include <QtCore/qtconfigmacros.h>
#include <QtCore/qdarwinhelpers.h>
 
#include <os/availability.h>
 
#include <AVFoundation/AVCaptureDevice.h>
 
QT_BEGIN_NAMESPACE
 
namespace QFFmpeg {
 
// Gives us rotational information for an AVCaptureDevice
class AvfCameraRotationTracker
{
public:
    AvfCameraRotationTracker() = default;
    explicit AvfCameraRotationTracker(AVCaptureDevice* avCaptureDevice);
    AvfCameraRotationTracker(AvfCameraRotationTracker &&) noexcept;
    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(AvfCameraRotationTracker)
    ~AvfCameraRotationTracker();
 
    void swap(AvfCameraRotationTracker &other);
 
    // Guaranteed to return rotation in clockwise 90 degree increments.
    [[nodiscard]] int rotationDegrees() const;
 
    [[nodiscard]] AVCaptureDevice* avCaptureDevice() const { return m_avCaptureDevice; }
 
private:
    void clear();
 
    AVCaptureDevice* m_avCaptureDevice = nullptr;
 
    // If running iOS 17+ or macOS 14+, we use AVCaptureDeviceRotationCoordinator
    // to get the camera rotation directly from the camera-device.
    API_AVAILABLE(macos(14.0), ios(17.0))
    AVCaptureDeviceRotationCoordinator *m_avRotationCoordinator = nullptr;
 
#ifdef Q_OS_IOS
    // If running iOS 16 or older, we use the UIDeviceOrientation
    // and the AVCaptureCameraPosition to apply rotation metadata
    // to the cameras frames.
    //
    // TODO: New bug reports implies this approach is not sufficient for iOS 16.
    bool m_receivingUiDeviceOrientationNotifications = false;
#endif
};
 
} // namespace QFFmpeg
 
QT_END_NAMESPACE
 
#endif // QAVFCAMERAROTATIONTRACKER_P_H