qsckwindowcapture_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 QSCKWINDOWCAPTURE_H
#define QSCKWINDOWCAPTURE_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/qplatformsurfacecapture_p.h>
 
#include <QtFFmpegMediaPluginImpl/private/qmacscreencapturekit_p.h>
 
#include <memory>
 
QT_BEGIN_NAMESPACE
 
class QFFmpegMediaCaptureSession;
 
namespace QFFmpeg {
 
class QSckWindowCapture : public QPlatformSurfaceCapture
{
    Q_OBJECT
 
public:
    explicit QSckWindowCapture();
    ~QSckWindowCapture() override = default;
 
    void setCaptureSession(QPlatformMediaCaptureSession *) override;
 
    QVideoFrameFormat frameFormat() const override;
 
    std::optional<int> ffmpegHWPixelFormat() const override;
 
    void onNewFrameFormatReceived(QMacScreenCaptureKit::StreamId streamId, const QVideoFrameFormat &);
 
    void onStreamStoppedWithErrorEvent(QMacScreenCaptureKit::StreamId streamId, const QString &);
 
protected:
    bool setActiveInternal(bool active) override;
 
    [[nodiscard]] std::optional<SourceSwitchResult>
    switchActiveSource(const Source &newSource) override;
 
private:
    QFFmpegMediaCaptureSession *m_session = nullptr;
 
    // Tracks the next ID for establishing stream.
    // Having stream IDs helps us track whether we should
    // ignore events from lingering stream callbacks.
    int64_t m_streamIdAllocator = 0;
    [[nodiscard]] QMacScreenCaptureKit::StreamId allocateStreamId() {
        return QMacScreenCaptureKit::StreamId { m_streamIdAllocator++ };
    }
 
    struct ActiveData {
        QMacScreenCaptureKit::StreamId streamId = {};
        AVFScopedPointer<SCWindow> scWindow;
        std::unique_ptr<QMacScreenCaptureKit> macScreenCaptureKit;
    };
    // Is allowed to be null when we have no on-going stream.
    std::unique_ptr<ActiveData> m_activeData;
 
    std::optional<QVideoFrameFormat> m_videoFrameFormat;
 
    [[nodiscard]] std::optional<QMacScreenCaptureKit::StreamId> activeStreamId() const noexcept {
        if (m_activeData)
            return m_activeData->streamId;
        return std::nullopt;
    }
};
 
} // namespace QFFmpeg
 
QT_END_NAMESPACE
 
#endif // QSCKWINDOWCAPTURE_H