qlibcamera_stream_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_STREAM_P_H
#define QLIBCAMERA_STREAM_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 <QtMultimedia/qvideoframe.h>
#include <QtMultimedia/qvideoframeformat.h>
#include <QtCore/private/qexpected_p.h>
#include <QtCore/qmutex.h>
#include <QtCore/qobject.h>
 
#include <libcamera/controls.h>
 
#include <chrono>
#include <mutex>
#include <optional>
 
namespace libcamera {
class Camera;
class FrameBuffer;
class Request;
class Stream;
} // namespace libcamera
 
QT_BEGIN_NAMESPACE
 
namespace QLibCamera {
 
class QLibCameraCameraStream final : public QObject
{
    Q_OBJECT
public:
    QLibCameraCameraStream(std::shared_ptr<libcamera::Camera>, libcamera::Stream *,
                           int bytesPerLine, QVideoFrameFormat, double maxFrameRate);
 
    // Runs on libcamera's CameraManager thread -- see the class comment above.
    void handleRequestCompleted(libcamera::Request *);
 
    template <typename Fn>
    void withPendingControls(Fn &&fn)
    {
        std::lock_guard lock(m_controlsMutex);
        fn(m_pendingControls);
    }
 
    libcamera::Stream *stream() const { return m_stream; }
 
Q_SIGNALS:
    void newVideoFrame(const QVideoFrame &);
 
private:
    const std::shared_ptr<libcamera::Camera> m_libcameraCamera;
    libcamera::Stream *const m_stream;
    const int m_bytesPerLine;
    const QVideoFrameFormat m_frameFormat;
    const double m_maxFrameRate;
 
    std::optional<std::chrono::nanoseconds> m_firstFrameTimestamp;
 
    QMutex m_controlsMutex;
    libcamera::ControlList m_pendingControls;
};
 
} // namespace QLibCamera
 
QT_END_NAMESPACE
 
#endif // QLIBCAMERA_STREAM_P_H